19-2408; Rev 2; 5/05 Differential Microphone Preamplifiers with Internal Bias and Complete Shutdown The MAX4060/MAX4061/MAX4062 are differential-input microphone preamplifiers optimized for notebook and PDA audio systems. These devices feature adjustable gain with excellent power-supply rejection and common-mode rejection ratios, making them ideal for lownoise applications in portable audio systems. The MAX4060/MAX4062 are capable of switching their output between the differential input and a singleended auxiliary microphone amplifier input. In addition, the MAX4060/MAX4062 have a low-noise microphone bias generator. The differential gain of the MAX4061/MAX4062 is set with a single resistor. The MAX4060 has a fixed gain of 10V/V and is PC99/2001 compliant. The MAX4061 includes a complete shutdown mode. In shutdown, the supply current is reduced to 0.3A and the current to the microphone bias is cut off for ultimate power savings. The MAX4060 operates from a 4.5V to 5.5V single supply and the MAX4061/MAX4062 operate from 2.4V to 5.5V. All devices are specified over the extended operating temperature range, -40C to +85C. The MAX4060/MAX4061 are available in tiny 8-pin thin QFN (3mm x 3mm x 0.8mm) and 8-pin MAX(R) packages. The MAX4062 is available in a 10-pin MAX package. Features 2.4V to 5.5V Single-Supply Operation Adjustable Gain or Fixed-Gain Options High PSRR (86dB at 1kHz) High CMRR (70dB at 1kHz) Low Input-Referred Noise Integrated Microphone Bias 750A Supply Current 0.3A Shutdown Current 4kV ESD Protection (AUX_IN) Rail-to-Rail Outputs THD+N: 0.04% at 1kHz Available in Space-Saving Packages 8-Pin Thin QFN (MAX4060/MAX4061) 8-Pin MAX (MAX4060/MAX4061) 10-Pin MAX (MAX4062) Typical Operating Circuit 2.4V TO 5.5V Applications Notebook Audio Systems Tablet PCs USB Audio Peripherals PDA Audio Systems Signal Conditioning BIAS 4 VCC AES-42-Compliant Microphones MAX4060 8 AUX_IN x10 INT/AUX 1 Ordering Information PART TEMP RANGE PINPACKAGE 8 Thin QFN-EP* BIAS TOP MARK MAX4060ETA -40C to +85C ABY MAX4060EUA -40C to +85C 8 MAX MAX4061ETA -40C to +85C 8 Thin QFN-EP* MAX4061EUA -40C to +85C 8 MAX -- MAX4062EUB -40C to +85C 10 MAX -- OUT 2 5 IN+ -- ABZ x10 6 IN- BIAS BIAS 3 VBIAS *EP = Exposed paddle. GND Pin Configurations and Selector Guide appear at end of data sheet. 7 MAX is a registered trademark of Maxim Integrated Products, Inc. ________________________________________________________________ Maxim Integrated Products For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim's website at www.maxim-ic.com. 1 MAX4060/MAX4061/MAX4062 General Description MAX4060/MAX4061/MAX4062 Differential Microphone Preamplifiers with Internal Bias and Complete Shutdown ABSOLUTE MAXIMUM RATINGS Supply Voltage (VCC to GND). .................................-0.3V to +6V Any Other Pin to GND ................................-0.3V to (VCC + 0.3V) Duration of Short Circuit to GND or VCC ....................Continuous Continuous Input Current (any pin) ................................ 10mA Continuous Power Dissipation (TA = +70C) 8-Pin Thin QFN (derate 4.7mW/C above +70C) ......379mW 8-Pin MAX (derate 4.1mW/C above +70C) ............330mW 10-Pin MAX (derate 5.6mW/C above +70C) .........444mW Operating Temperature Range ...........................-40C to +85C Junction Temperature ......................................................+150C Storage Temperature Range .............................-65C to +150C Lead Temperature (soldering, 10s) .................................+300C Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. ELECTRICAL CHARACTERISTICS (V CC = 3V for MAX4061/MAX4062, V CC = 5V for MAX4060, GND = 0V, SHDN = V CC , INT/AUX = 0V, R G = 11.11k, RL = 100k to 1.5V, RBIAS = , TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) (Notes 1, 2) PARAMETER Supply Voltage Range Supply Current Output Common-Mode Voltage Slew Rate Supply Current in Shutdown Output Short-Circuit Current SYMBOL VCC CONDITIONS Inferred from PSRR test MIN 5.5 MAX4060 4.5 5.5 ICC I SHDN ISC MAX 2.4 VOCM SR TYP MAX4061/MAX4062 1.25 0.75 1.2 1.5 1.75 1 AV = 10V/V V SHDN = 0V, MAX4061 0.001 To GND 30 To VCC 30 UNITS V mA V V/s 1 A mA DIFFERENTIAL INPUT (INT/AUX = 0V for MAX4060/MAX4062, default for MAX4061) Input Offset Voltage VOS Common-Mode Input Voltage Range VCM Maximum Differential Input Voltage Small-Signal Bandwidth Input Resistance Input Resistance Match Input Noise-Voltage Density RMS Output Noise Voltage 2 VDIFFMAX 0.1 1 AV = 1V/V, MAX4061/MAX4062 BW-3dB RIN VNRMS mV 2 V 1 V 600 kHz Either differential input 100 k 1 % AV = 10V/V, f = 1kHz 100 AV = 100V/V, f = 1kHz, MAX4061/MAX4062 only 20 AV = 10V/V, BW = 22Hz to 22kHz 125 RMATCH en 5 nV/Hz _______________________________________________________________________________________ VRMS Differential Microphone Preamplifiers with Internal Bias and Complete Shutdown (V CC = 3V for MAX4061/MAX4062, V CC = 5V for MAX4060, GND = 0V, SHDN = V CC , INT/AUX = 0V, R G = 11.11k, RL = 100k to 1.5V, RBIAS = , TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) (Notes 1, 2) PARAMETER SYMBOL Total Harmonic Distortion Plus Noise Differential Gain THD+N AVDIFF CONDITIONS AV = 10V/V, f = 1kHz, VOUT = 0.7VRMS, BW = 22Hz to 22kHz 1V < VCM < 2V, VOUT = 0.7VRMS, MAX4061/MAX4062 RG = open Power-Supply Rejection Ratio CMRR PSRR TYP MAX 0.04 1 1.13 1.3 9.6 10 10.4 RG = 1.01k 96 100 104 9.6 10.0 10.4 TA = +25C 72 89 TA = TMIN to TMAX 60 VCM = 500mVP-P, f = 1kHz 70 VCC = 5V 100mV, f = 1kHz UNITS % RG = 11.11k 1V < VCM < 2V, VOUT = 0.7VRMS, MAX4060 Common-Mode Rejection Ratio MIN V/V dB dB 86 AUXILIARY INPUT (MAX4060/MAX4062, INT/AUX = VCC) Small-Signal Bandwidth BW-3dB 200 Input Resistance RIN 100 k Input Noise-Voltage Density en f = 1kHz 45 nV/Hz RMS Output Noise Voltage VNRMS BW = 22Hz to 22kHz 385 VRMS Total Harmonic Distortion Plus Noise THD+N f = 1kHz, BW = 22Hz to 22kHz 0.05 % Power-Supply Rejection Ratio PSRR Voltage Gain AVAUX TA = +25C 65 TA = TMIN - TMAX 50 VOUT = 0.7VRMS -10.7 -10 IBIAS = 0.8mA to GND, MAX4060 2 2.2 IBIAS = 0.5mA to GND, MAX4062 2 2.2 IBIAS = 0.8mA to GND, MAX4060 (TA = +25C) 2 2.5 kHz 90 dB -9.3 V/V BIAS OUTPUT (MAX4060/MAX4062) Output Voltage VOUT Output Resistance ROUT Output Noise Voltage VNRMS IBIAS = 0.5mA to GND, MAX4062 (TA = +25C) 22 IBIAS = 0.8mA to GND, BW = 22Hz to 22kHz, MAX4060 50 IBIAS = 0.5mA to GND, BW = 22Hz to 22kHz, MAX4062 20 V k 40 VRMS _______________________________________________________________________________________ 3 MAX4060/MAX4061/MAX4062 ELECTRICAL CHARACTERISTICS (continued) MAX4060/MAX4061/MAX4062 Differential Microphone Preamplifiers with Internal Bias and Complete Shutdown ELECTRICAL CHARACTERISTICS (continued) (V CC = 3V for MAX4061/MAX4062, V CC = 5V for MAX4060, GND = 0V, SHDN = V CC , INT/AUX = 0V, R G = 11.11k, RL = 100k to 1.5V, RBIAS = , TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) (Notes 1, 2) PARAMETER SYMBOL CONDITIONS MAX4060 Power-Supply Rejection Ratio IBIAS = 0.8mA to GND, VCC = 4.5V to 5.5V MIN TYP 50 80 IBIAS = 0.8mA, VCC = 5V + 100mVP-P, f = 1kHz PSRR MAX4062 IBIAS = 0.5mA to GND, VCC = 2.4V to 5.5V MAX UNITS 70 dB 50 IBIAS = 0.5mA, VCC = 3V + 100mVP-P, f = 1kHz 74 71 DIGITAL INPUTS (SHDN for MAX4061 and INT/AUX for MAX4060/MAX4062) Input Leakage Current IIN Input-Voltage High VINH Input-Voltage Low VINL 1 VIN = 0V or VCC 0.7 x VCC A V 0.3 x VCC V Shutdown Enable Time tON MAX4061 10 s Shutdown Disable Time tOFF MAX4061 10 s Note 1: All specifications are 100% tested at TA = +25C. Specification limits over temperature (TA = TMIN to TMAX) are guaranteed by design, not production tested. Note 2: MAX4062 requires a 1F capacitor from BIAS to ground. 4 _______________________________________________________________________________________ Differential Microphone Preamplifiers with Internal Bias and Complete Shutdown (VCC = 3V (MAX4061/MAX4062), VCC = 5V for MAX4060, AV = 10V/V, RL 100k to 1.5V, SHDN = VCC (MAX4061 only), TA = +25C, unless otherwise noted.) GAIN vs. FREQUENCY (NO LOAD) POWER-SUPPLY REJECTION RATIO vs. FREQUENCY (DIFF INPUT) -6 -60 -15 100 1k 10k 100k 1M VCC = 3V 0.6 0.4 AV = 100V/V -120 10 VCC = 5V 0.2 -100 -12 0 10 100 1k 10k 100k 1M -40 -25 -10 5 20 35 50 65 FREQUENCY (Hz) FREQUENCY (Hz) TEMPERATURE (C) SUPPLY CURRENT vs. SUPPLY VOLTAGE SHUTDOWN SUPPLY CURRENT vs. TEMPERATURE OUTPUT-VOLTAGE HIGH vs. TEMPERATURE 0.6 0.5 0.4 0.3 0.2 AV = 10V/V NO LOAD 0.1 10 0.01 ILOAD = 50A 0.001 0 2.5 3.0 3.5 4.0 4.5 5.0 1 -40 5.5 -15 10 35 60 85 -40 -15 10 35 60 SUPPLY VOLTAGE (V) TEMPERATURE (C) TEMPERATURE (C) OUTPUT-VOLTAGE LOW vs. TEMPERATURE OUTPUT-VOLTAGE HIGH vs. LOAD CURRENT OUTPUT-VOLTAGE LOW vs. LOAD CURRENT 175 MAX4060 toc07 1000 VOH = VCC - VOUT 150 ILOAD = 2.5mA 250 VCC = 3V 125 200 VOL (mV) VOH (mV) 100 VOL (mV) 85 300 MAX4060 toc08 2.0 MAX4060 toc06 ILOAD = 2.5mA 100 1 MAX4060 toc09 0.1 10 VOH = VCC - VOUT VOH (mV) 0.7 80 1000 MAX4060 toc05 MAX4060 toc04 0.8 100 SHUTDOWN SUPPLY CURRENT (nA) 0.9 SUPPLY CURRENT (mA) AV = 10V/V -80 -9 0.8 SUPPLY CURRENT (mA) PSRR (dB) GAIN (dB) -40 MAX4060 toc03 -20 0 -3 1.0 MAX4060 toc02 3 SUPPLY CURRENT vs. TEMPERATURE 0 MAX4060 toc01 VCC = 5V 100 75 VCC = 3V 150 100 10 50 50 25 ILOAD = 50A 0 0 1 -40 -15 10 35 TEMPERATURE (C) 60 85 0 1 2 3 LOAD CURRENT (mA) 4 5 0 1 2 3 4 5 LOAD CURRENT (mA) _______________________________________________________________________________________ 5 MAX4060/MAX4061/MAX4062 Typical Operating Characteristics Typical Operating Characteristics (continued) (VCC = 3V (MAX4061/MAX4062), VCC = 5V for MAX4060, AV = 10V/V, RL 100k to 1.5V, SHDN = VCC (MAX4061 only), TA = +25C, unless otherwise noted.) TOTAL HARMONIC DISTORTION PLUS NOISE vs. FREQUENCY (DIFF INPUT) IBIAS = 800A 2.275 VOUT = 2.26VP-P 1 MAX4060 toc12 1 MAX4060 toc10 2.300 TOTAL HARMONIC DISTORTION PLUS NOISE vs. FREQUENCY (AUX INPUT) MAX4060 toc11 MAX4060 MIC BIAS VOLTAGE vs. TEMPERATURE VOUT = 2.26VP-P VCC = 3V 0.1 THD+N (%) 2.225 2.200 2.175 VCC = 3V 0.1 THD+N (%) MIC BIAS VOLTAGE (V) 2.250 VCC = 5V VCC = 5V 0.01 0.01 2.150 2.125 0.001 2.100 -40 -15 10 35 60 1k 10k 100k 10 100 1k 10k FREQUENCY (Hz) TOTAL HARMONIC DISTORTION PLUS NOISE vs. OUTPUT AMPLITUDE (DIFF INPUT, VCC = 3V) TOTAL HARMONIC DISTORTION PLUS NOISE vs. OUTPUT AMPLITUDE (DIFF INPUT, VCC = 5V) TOTAL HARMONIC DISTORTION PLUS NOISE vs. OUTPUT AMPLITUDE (AUX INPUT, VCC = 3V) f = 1kHz THD+N (%) f = 1kHz 0.1 BW = 22kHz 1 THD+N (%) 1 10 MAX4060 toc15 BW = 22kHz MAX4060 toc14 MAX4060 toc13 10 1 0.1 0.1 f = 1kHz f = 10kHz f = 10kHz f = 10kHz 0.01 0.01 0.01 0.001 0.001 0 0.5 1.0 1.5 2.0 2.5 0.001 0 3.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 0 0.5 1.0 1.5 2.0 2.5 OUTPUT VOLTAGE (VP-P) OUTPUT VOLTAGE (VP-P) OUTPUT VOLTAGE (VP-P) TOTAL HARMONIC DISTORTION PLUS NOISE vs. OUTPUT AMPLITUDE (AUX INPUT, VCC = 5V) INPUT-REFERRED NOISE vs. FREQUENCY (DIFF INPUT) MAX4060 MIC BIAS OUTPUT NOISE MAX4060 toc17 BW = 22kHz 3.0 MAX4060 toc18 800 MAX4060 toc16 10 700 VCC = 5V BW = 22Hz TO 22kHz 600 (nV/Hz) 1 f = 1kHz 0.1 500 400 5V/div 300 f = 10kHz 0.01 200 100 0 0.001 0 0.5 1.0 1.5 2.0 2.5 OUTPUT VOLTAGE (VP-P) 6 100k FREQUENCY (Hz) BW = 22kHz THD+N (%) 0.001 100 10 85 TEMPERATURE (C) 10 THD+N (%) MAX4060/MAX4061/MAX4062 Differential Microphone Preamplifiers with Internal Bias and Complete Shutdown 3.0 3.5 10 100 1k 10k 100k 100ms/div FREQUENCY (Hz) _______________________________________________________________________________________ Differential Microphone Preamplifiers with Internal Bias and Complete Shutdown (VCC = 3V (MAX4061/MAX4062), VCC = 5V for MAX4060, AV = 10V/V, RL 100k to 1.5V, SHDN = VCC (MAX4061 only), TA = +25C, unless otherwise noted.) MAX4062 MIC BIAS OUTPUT NOISE SMALL-SIGNAL TRANSIENT RESPONSE FOR DIFF INPUT MAX4060 toc19 MAX4060 toc20 VCC = 5V BW = 22Hz TO 22kHz INPUT 5mV/div 5V/div OUTPUT 50mV/div 100ms/div 10s/div SMALL-SIGNAL TRANSIENT RESPONSE FOR AUX INPUT LARGE-SIGNAL TRANSIENT RESPONSE FOR DIFF INPUT MAX4060 toc22 MAX4060 toc21 INPUT 100mV/div INPUT 5mV/div OUTPUT 1V/div OUTPUT 50mV/div 10s/div 10s/div LARGE-SIGNAL TRANSIENT RESPONSE FOR AUX INPUT OUTPUT OVERDRIVEN MAX4060 toc23 MAX4060 toc24 INPUT 200mV/div DIFFERENTIAL INPUT INPUT 500mV/div OUTPUT 1V/div 10s/div OUTPUT 1V/div 10s/div _______________________________________________________________________________________ 7 MAX4060/MAX4061/MAX4062 Typical Operating Characteristics (continued) Differential Microphone Preamplifiers with Internal Bias and Complete Shutdown MAX4060/MAX4061/MAX4062 Pin Description PIN NAME FUNCTION 2 INT/AUX Internal (Differential) or Auxiliary (Single-Ended) Input Select. Drive INT/AUX low to select internal or high to select auxiliary microphone input. 3 3 OUT Amplifier Output. OUT is high impedance when in shutdown mode. 3 -- -- BIAS External Electret Microphone Capsule Bias Output. BIAS has a greater than 2k output impedance. 4 4 5 VCC Power Supply. Bypass the VCC to GND with a 0.1F capacitor. 5 5 6 IN+ Noninverting Differential Amplifier Input. AC-couple the audio signal into IN+. 6 6 7 IN- Inverting Differential Amplifier Input. AC-couple the audio signal into IN-. 7 7 8 GND MAX4060 MAX4061 MAX4062 1 -- 2 Ground 8 -- 9 AUX_IN Single-Ended Input for Auxiliary Microphone. AC-couple the audio signal into AUX_IN. -- 1 1 G2 Gain-Selectable Input. Connect an external resistor between G1 and G2 to set the gain for the differential amplifier. (See Adjustable Differential-Gain Setting section.) -- 2 -- SHDN Shutdown Input. Drive SHDN high for normal operation. Drive SHDN low for shutdown mode. -- -- 4 BIAS External Electret Microphone Capsule Bias Output Bypass BIAS with 1F Capacitor to Ground -- 8 10 G1 Gain-Selectable Input. Connect an external resistor between G1 and G2 to set the gain for the differential amplifier. Detailed Description The MAX4060/MAX4061/MAX4062 are differential microphone preamplifiers providing high-quality audio, optimized for use in computer and mobile applications. These devices feature rail-to-rail outputs, very high power-supply rejection, and common-mode rejection, making them ideal for low-noise applications. The MAX4060/MAX4061/MAX4062 are particularly effective when layout constraints force the microphone amplifier to be physically remote from the ECM microphone and/or the rest of the audio circuitry. The MAX4060/MAX4062 are capable of switching their output between the differential input and an inverting single-ended input. INT/AUX selects either the differential input or single-ended auxiliary input. In addition, the MAX4060/MAX4061 have an internal bias generator to bias the microphone in either differential or singleended modes. The MAX4061 includes a complete 8 0.3A shutdown mode for ultimate power savings. The differential gain of the MAX4061/MAX4062 is set with a single resistor connected between the G1 and G2 pins. The MAX4060 has a fixed gain of 10V/V. Differential Input The main microphone input is a low-noise, differential input structure. This is an almost essential element when faced with amplification of low-amplitude analog signals in digitally intense environments such as notebook PCs or PDAs. Used correctly, the advantages over a single-ended solution are: * Better power-supply noise rejection. * Less degradation from noise in PC board ground planes. * The microphone and preamplifier can be placed physically further apart, easing PC board layout restrictions. _______________________________________________________________________________________ Differential Microphone Preamplifiers with Internal Bias and Complete Shutdown 2.4V TO 5.5V BIAS 4 VCC MAX4060 8 AUX_IN x10 INT/AUX 1 BIAS OUT 2 5 IN+ x10 6 IN- BIAS BIAS 3 VBIAS GND 7 Fixed Differential Gain (MAX4060) The MAX4060 has an internal fixed gain of 10V/V for its differential input. This feature simplifies design, reduces pin count, footprint, and eliminates external gain-setting resistors. Adjustable Differential-Gain Setting The MAX4061/MAX4062 allow the user to alter the gain to optimize the signal-to-noise ratio (SNR) of their system. The gain is set by a single external resistor (RG) connected between the G1 and G2 pins, where: RG = 100k / (AV - 1) where AV is the required voltage gain. Hence, an 11.11k resistor yields a gain of 10V/V, or 20dB. Leaving the pins unconnected results in a gain of 1V/V. Gain for the MAX4061/MAX4062 is defined as: AV = VOUT / (VIN+ - VIN-) The resistor can be either fixed or variable, allowing the use of a digitally controlled potentiometer to alter the gain under software control. Input Capacitors The two differential microphone inputs and the singleended auxiliary input of the MAX4060/MAX4061/ MAX4062 have on-chip bias components, allowing the user to AC-couple any signals onto the input. The input resistance is 100k (typ), so the capacitor size may be chosen accordingly to define the LF rolloff desired. This can be calculated as: CIN = 1 / (2fCUTRIN) This assumes a low source impedance driving the inputs. A further consideration for the differential input is the effect of these series input capacitors on low-frequency, common-mode rejection. Any mismatch in the values of these two capacitors degrades the CMRR at frequencies where the impedance of the capacitor is significant compared to the input resistance of the amplifier--this is usually most noticeable at low frequencies. One way to avoid the need for matched or tight tolerance capacitors is to deliberately oversize the values on the differ- _______________________________________________________________________________________ 9 MAX4060/MAX4061/MAX4062 Functional Diagram MAX4060/MAX4061/MAX4062 Differential Microphone Preamplifiers with Internal Bias and Complete Shutdown 2.4V TO 5.5V 5 100k VCC RBIAS 4 BIAS VBIAS CBIAS MAX4062 9 AUX_IN x10 INT/AUX 2 OUT 3 6 IN+ 7 IN- G1 10 G2 1 GND 8 Figure 1. MAX4062 with Auxiliary Input Configuration ential inputs and to set the lower 3dB point (fCUT) of the amplifier by sizing the output capacitor appropriately. The input impedance matching on the differential input is typically 1%, allowing input capacitor matching to be effective at improving low-frequency PSRR. Common-Mode Rejection Ratio The common-mode rejection ratio (CMRR) refers to the amount of rejection that the amplifier is capable of providing to any signal applied equally to the IN+ and INinputs. In the case of amplifying low-level microphone signals in noisy digital environments, it is a key figure of merit. In audio circuits, this is generally measured for VIN as an AC signal: CMRR(dB) = ADM / ACM where ADM is the differential gain, ACM is the commonmode gain. Input voltages are sufficiently small such that the output is not clipped in either differential or common-mode application. The topology used in the MAX4061/ MAX4062 means that the CMRR actually improves at higher differential gains--another advantage of using differential sensing. 10 Auxiliary Input The auxiliary input is a single-ended input intended to be used with a jack-socket-type microphone input (Figure 1). Internal DC-bias components (as on the main inputs) allow the input signal to be AC-coupled. Mechanically switched jack sockets can be used in conjunction with the INT/AUX select pin, allowing the auxiliary microphone input to be automatically selected when a jack socket is inserted. Microphone Bias Voltage MAX4060 The MAX4060 has a microphone bias voltage designed to comply with the Microsoft/Intel PC99/2001 audio standard. It features source impedance of greater than 2k, and delivers more than 2V of bias when loaded with a current of 800A. This limits operation of this part to supplies between 4.5V to 5.5V (see Figure 2). ______________________________________________________________________________________ Differential Microphone Preamplifiers with Internal Bias and Complete Shutdown MAX4060/MAX4061/MAX4062 4.5V TO 5.5V 4 VCC MICROPHONE INPUT MAX4060 8 AUX_IN x10 3 BIAS INT/AUX 1 OUT 2 VBIAS RBIAS 5 IN+ x10 6 INGND 7 Figure 2. MAX4060 Used for Biasing a Microphone MAX4061/MAX4062 The MAX4061/MAX4062 have a lower bias voltage and low-impedance outputs (optimum electret bias resistor can then be set externally). This gives a low-noise, flexible solution that can run from 2.4V to 5.5V, suitable for hand-held devices such as PDAs that typically have audio power supplies in the 3V region (see Figure 3). In applications where the differential microphone is placed some distance from the MAX4060/MAX4061/ MAX4062, using a remote differential bias scheme as shown in Figure 4 can provide improved noise rejection. Output MAX4060/MAX4061 DC Bias The output voltage has a DC-bias voltage independent of the power supplies, resulting in superior PSRR performance. The MAX4061 output is high impedance when the part is in shutdown mode. AC-coupling the output into the next audio stage (e.g., CODEC) is recommended. Applications Information Shutdown Mode The MAX4061 features a low-power, complete shutdown mode. When SHDN goes low, the supply current drops to 0.3A, the output enters a high-impedance state, and the bias current to the microphone is switched off. Driving SHDN high enables the amplifier. SHDN should not be left floating. Power Supplies and Layout The MAX4060 operates from a 4.5V to 5.5V single supply and the MAX4061/MAX4062 operate from a 2.4V to 5.5V single supply. Bypass the power supply with a 0.1F capacitor to ground. In systems where analog and digital grounds are available, the MAX4060/ MAX4061 should be connected to the analog ground. ______________________________________________________________________________________ 11 MAX4060/MAX4061/MAX4062 Differential Microphone Preamplifiers with Internal Bias and Complete Shutdown 2.4V TO 5.5V 5 VCC 4 BIAS VBIAS MAX4062 0.1F 9 AUX_IN x10 0.1F INT/AUX 2 2.2k 10 G1 RG 11k OUT 3 1 G2 2.2k 0.1F 6 IN+ 7 IN0.1F GND 8 Figure 3. MAX4062 Used to Bias a Microphone Connected to the Auxiliary Input and the Differential Input 12 ______________________________________________________________________________________ Differential Microphone Preamplifiers with Internal Bias and Complete Shutdown MAX4060/MAX4061/MAX4062 2.4V TO 5.5V 5 VCC 4 BIAS VBIAS MAX4062 0.1F 9 AUX_IN 2.2k x10 0.1F INT/AUX 2 VDD 10 G1 1k RG 11k OUT 3 1 G2 1k 2.2F 0.1F 6 IN+ 7 IN1k 0.1F GND 8 1k 2.2F Figure 4. Remote Differential Microphone Bias Network Optimizes Noise Rejection in Long-Run, PC Board Traces Pin Configurations TOP VIEW INT/AUX 1 8 AUX_IN OUT 2 7 GND BIAS 3 6 IN- VCC 4 MAX4060 5 MAX/THIN QFN IN+ G2 1 8 G1 SHDN 2 7 GND OUT 3 6 IN- VCC 4 MAX4061 5 MAX/THIN QFN IN+ G2 1 10 G1 INT/AUX 2 OUT 3 BIAS 4 7 IN- VCC 5 6 IN+ MAX4062 9 AUX_IN 8 GND MAX ______________________________________________________________________________________ 13 Differential Microphone Preamplifiers with Internal Bias and Complete Shutdown MAX4060/MAX4061/MAX4062 Block Diagrams 4.5V TO 5.5V 2.4V TO 5.5V 4 5 VCC 4 VCC MAX4060 8 VCC 2.4V TO 5.5V AUX_IN MAX4062 8 AUX_IN x10 x10 INT/AUX 3 BIAS 1 MAX4061 2 SHDN INT/AUX 2 4 BIAS VBIAS VBIAS 5 IN+ OUT 5 IN+ 6 IN- 2 OUT OUT 3 3 6 IN+ 6 INx10 GND G1 G2 8 1 GND 7 7 IN- 7 G1 G2 10 1 GND 8 Selector Guide PRODUCT* AUXILIARY INPUT DIFF INPUT GAIN SINGLE-ENDED INPUT GAIN (dB) MICROPHONE BIAS SHUTDOWN MODE SUPPLY VOLTAGE (V) MAX4060 20dB 20 -- 4.5 to 5.5 MAX4061 -- ADJ -- -- 2.4 to 5.5 MAX4062 ADJ 20 -- 2.4 to 5.5 *See Block Diagrams. Chip Information TRANSISTOR COUNT: 264 PROCESS: BiCMOS 14 ______________________________________________________________________________________ Differential Microphone Preamplifiers with Internal Bias and Complete Shutdown 6, 8, &10L, DFN THIN.EPS D2 D A2 PIN 1 ID N 0.35x0.35 b PIN 1 INDEX AREA E [(N/2)-1] x e REF. E2 DETAIL A e k A1 CL A CL L L e e PACKAGE OUTLINE, 6,8,10 & 14L, TDFN, EXPOSED PAD, 3x3x0.80 mm -DRAWING NOT TO SCALE- 21-0137 G 1 2 COMMON DIMENSIONS MIN. MAX. D 0.70 2.90 0.80 3.10 E A1 2.90 0.00 3.10 0.05 L k 0.20 0.40 0.25 MIN. A2 0.20 REF. SYMBOL A PACKAGE VARIATIONS PKG. CODE N D2 E2 e JEDEC SPEC b [(N/2)-1] x e DOWNBONDS ALLOWED T633-1 6 1.500.10 2.300.10 0.95 BSC MO229 / WEEA 0.400.05 1.90 REF NO T633-2 6 1.500.10 2.300.10 0.95 BSC MO229 / WEEA 0.400.05 1.90 REF NO T833-1 8 1.500.10 2.300.10 0.65 BSC MO229 / WEEC 0.300.05 1.95 REF NO T833-2 8 1.500.10 2.300.10 0.65 BSC MO229 / WEEC 0.300.05 1.95 REF NO T833-3 8 1.500.10 2.300.10 0.65 BSC MO229 / WEEC 0.300.05 1.95 REF YES T1033-1 10 1.500.10 2.300.10 0.50 BSC MO229 / WEED-3 0.250.05 2.00 REF NO T1433-1 14 1.700.10 2.300.10 0.40 BSC ---- 0.200.05 2.40 REF YES T1433-2 14 1.700.10 2.300.10 0.40 BSC ---- 0.200.05 2.40 REF NO PACKAGE OUTLINE, 6,8,10 & 14L, TDFN, EXPOSED PAD, 3x3x0.80 mm -DRAWING NOT TO SCALE- 21-0137 G 2 2 ______________________________________________________________________________________ 15 MAX4060/MAX4061/MAX4062 Package Information (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information, go to www.maxim-ic.com/packages.) Package Information (continued) (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information, go to www.maxim-ic.com/packages.) 4X S 8 8 INCHES DIM A A1 A2 b E O0.500.1 H c D e E H 0.60.1 L 1 1 0.60.1 S BOTTOM VIEW D MIN 0.002 0.030 MAX 0.043 0.006 0.037 0.014 0.010 0.007 0.005 0.120 0.116 0.0256 BSC 0.120 0.116 0.198 0.188 0.026 0.016 6 0 0.0207 BSC 8LUMAXD.EPS MAX4060/MAX4061/MAX4062 Differential Microphone Preamplifiers with Internal Bias and Complete Shutdown MILLIMETERS MAX MIN 0.05 0.75 1.10 0.15 0.95 0.25 0.36 0.13 0.18 2.95 3.05 0.65 BSC 2.95 3.05 4.78 5.03 0.41 0.66 0 6 0.5250 BSC TOP VIEW A1 A2 A c e FRONT VIEW b L SIDE VIEW PROPRIETARY INFORMATION TITLE: PACKAGE OUTLINE, 8L uMAX/uSOP APPROVAL DOCUMENT CONTROL NO. 21-0036 16 ______________________________________________________________________________________ REV. J 1 1 Differential Microphone Preamplifiers with Internal Bias and Complete Shutdown 10LUMAX.EPS e 4X S 10 10 INCHES H O0.500.1 0.60.1 1 1 0.60.1 BOTTOM VIEW TOP VIEW D2 MILLIMETERS MAX DIM MIN 0.043 A 0.006 A1 0.002 A2 0.030 0.037 D1 0.116 0.120 0.114 0.118 D2 0.116 E1 0.120 E2 0.114 0.118 H 0.187 0.199 L 0.0157 0.0275 L1 0.037 REF b 0.007 0.0106 e 0.0197 BSC c 0.0035 0.0078 0.0196 REF S 0 6 MAX MIN 1.10 0.15 0.05 0.75 0.95 3.05 2.95 3.00 2.89 3.05 2.95 2.89 3.00 4.75 5.05 0.40 0.70 0.940 REF 0.177 0.270 0.500 BSC 0.090 0.200 0.498 REF 0 6 E2 GAGE PLANE A2 c A b A1 E1 L D1 L1 FRONT VIEW SIDE VIEW PROPRIETARY INFORMATION TITLE: PACKAGE OUTLINE, 10L uMAX/uSOP APPROVAL DOCUMENT CONTROL NO. 21-0061 REV. I 1 1 Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 17 (c) 2005 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products, Inc. MAX4060/MAX4061/MAX4062 Package Information (continued) (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information, go to www.maxim-ic.com/packages.)