NJM2748/2748A Low Offset, Low Drift single JFET Input Operational Amplifier GENERAL DESCRIPTION The NJM2748/2748A is a Precision dual JFET input operational amplifier which includes low input offset voltage: 0.7mV (typ) / 2.0mV (max) and 6V/C typical offset drift. The NJM2748A is guaranteed 20V/C maximum offset drift to perform a 100% tested. The NJM2748/2748A have the following features: low bias current of 50pA (typ), high slew rate of 13V/s (typ). These features are suitable for signal processing amplifiers of instrumentation, measurement and industrial applications such as sensor amplifier, current sensing and sample-and-hold circuit. PACKAGE OUTLINE NJM2748D/2748AD NJM2748M/2748AM FEATURES Input Offset Voltage Drift Input Offset Voltage Input Bias Current Slew Rate Operating Voltage Voltage Gain Bipolar Technology *Package Outline NJM2748: VIO/T= 6V/C typ. NJM2748A: VIO/T=20V/C max. 2.0mV max. @Ta=25C ~ 85C 3.0mV max. @Ta= -40C IB= 50pA typ. 200pA max. @Ta=25C SR=13V/s typ. @Ta=25C Vopr= 6.0V ~ 16V Av=100dB typ. NJM2748D, NJM2748AD :DIP8 NJM2748M, NJM2748AM :DMP8 PIN CONFIGURATION (Top View) BALANCE 1 8 NC -INPUT A 2 7 V +INPUT A 3 6 OUTPUT V- 4 5 BALANCE + NJM2748/2748A Ver.2007-05-24 -1- NJM2748/2748A ABSOLUTE MAXIMUM RATING (Ta=25C unless otherwise specified) PARAMETER SYMBOL + RATING UNIT Supply Voltage - V /V 18 Common Mode Input Voltage VICM 15 Differential Input Voltage VID 30 V 500 [ DIP8 ], 300 [ DMP8 ] mW Power Dissipation PD V (Note1) V 430 [ DMP8 ] (Note2) mW 580 [ DMP8 ] (Note3) mW Operating Temperature Range Topr -40 ~ +85 C Storage Temperature Range Tstg -50 ~ +125 C (Note1) For supply voltage less than 18V, the maximum input voltage is equal to the supply voltage. (Note2) Mounted on the EIA/JEDEC standard board (76.2x114.3x1.6mm, two layer, FR-4). (Note3) Mounted on the EIA/JEDEC standard board (76.2x114.3x1.6mm, four layer, FR-4). RECOMMENDED OPERATING VOLTAGE (Ta=25C) PARAMETER SYMBOL Supply Voltage + RATING MIN. TYP. MAX. UNIT 6 - 16 V - V /V ELECTRONIC CHARACTERISTICS + *DC CHARACTERISTICS (V /V =15V, Ta=-40 to +85C (Note4) unless otherwise specified) PARAMETER Input Offset Voltage Drift SYMBOL VIO/T CONDITION NJM2748A NJM2748 (Note5, 6) MIN. TYP. MAX. - 6 20 - 6 - UNIT V/C Input Offset Voltage1 VIO1 RS=50, Ta=+85C (Note6, 7) - 0.6 2.0 mV Input Offset Voltage2 VIO2 RS=50, Ta=+25C (Note6, 7) - 0.7 2.0 mV Input Offset Voltage3 VIO3 RS=50, Ta=-40C (Note6, 7) - 0.9 3.0 mV Common Mode Rejection Ratio CMR VICM=10V (Note8) 76 92 - dB + - Supply Voltage Rejection Ratio SVR V /V =6V ~ 16V (Note7, 9) 80 100 - dB Input Common Mode Voltage Range 1 VICM1 CMR76dB (Note10) +10 +14.5 - V Input Common Mode Voltage Range 2 VICM2 CMR76dB (Note10) - -11 -10 V Input Bias Current 1 IB1 Ta=+25C (Note7) - 50 200 pA Input Bias Current 2 IB2 Ta=+85C (Note7) - - 4 nA Input Offset Current 1 IIO1 Ta=+25C (Note7) - 25 100 pA Input Offset Current 2 IIO2 Ta=+85C (Note7) - - 2 nA Voltage Gain 1 Av1 RL=2k, Vo=10V, Ta=+25C 88 100 - dB Voltage Gain 2 Av2 RL=2k, Vo=10V 82 100 - dB Maximum Output Voltage 1 VOM1 RL=10k 12 13.5 - V Maximum Output Voltage 2 VOM2 RL=2k 10 11.5 - V - 2.0 3.4 mA Supply Current -2- Icc Voltage Follower, RL= (Note7) Ver.2007-05-24 NJM2748/2748A (Note4) These devices are measured under three temperature conditions of Ta=-40C, +25C, +85C. (Note5) Temperature coefficient is calculated by specified change in offset voltage. (Changes Ta=+25C to -40C and Ta=+25C to +85C) NJM2748A is guaranteed maximum specification because these are 100% tested to operating temperature range. NJM2748 is guaranteed only typical specification. (Note6) Written by the absolute rate. (Note7) Measured at VICM=0V (Note8) CMR is calculated by specified change in offset voltage. (VICM=0V to +10V and VICM=0V to -10V) + - (Note9) SVR is calculated by specified change in offset voltage. (V /V =6V to 16V) (Note10) VICM is input common mode voltage when tested meets specified change in offset voltage is CMR76dB. (A point of reference is offset voltage of VICM=0V) + *AC CHARACTERISTICS (V /V-=15V, Ta=+25C unless otherwise specified) PARAMETER MIN. TYP. MAX. UNIT f=10kHz - 2.2 - MHz fT AV=+100, RS=100, RL=, CL=10pF - 2 - MHz Phase Margin M AV=+100, RS=100, RL=, CL=10pF - 55 - deg Input Noise Voltage1 VNI1 f=1kHz, AV=+100, RS=100, RL= - 20 - nV/Hz Input Noise Voltage2 VNI2 RIAA, RS=2.2k, 30kHz, LPF - 2.5 - Vrms Total Harmonic Distortion THD f=1kHz, AV=+10, RS=1k, RL=, VO=5Vrms - 0.005 - % MIN. TYP. MAX. UNIT Gain Bandwidth Product Unity Gain Frequency SYMBOL CONDITION GB + - *TRANSIENT CHARACTERISTICS (V /V =15V, Ta=+25C unless otherwise specified) PARAMETER SYMBOL CONDITION Positive Slew Rate +SR AV=+1, VIN=2Vpp, RL=10k, CL=10pF - 14 - V/s Negative Slew Rate -SR AV=+1, VIN=2Vpp, RL=10k, CL=10pF - 12 - V/s Ver.2007-05-24 -3- NJM2748/2748A IMPORTANT CONSIDERATIONS FOR USE OF NJM2748/2748A *Supply Current When Ta25C, Power Dissipation PD is limited by junction temperature (TJ=125C) So maximum supply current is influenced by package, mounting board (board size, area of cupper foil), Mounting condition and etc. Following DMP8 Power Dissipation characteristic is a characteristic when mounted the following conditions supply. * Two layer board: EIA/JEDEC 76.2x114.3x1.6mm, FR-4 * Four layer board: EIA/JEDEC 76.2x114.3x1.6mm, FR-4 Please refer to "Method of measuring the package thermal characteristic" published in our company web site for detailed information on the thermal characteristic. Maximum Power Dissipation - Ambient Temperature (DMP8) 600 500 EIA/JEDEC 4-Layer EIA/JEDEC 2-Layer 400 300 Package Only 200 (DIP8) 600 Power Dissipation PD [mW] Power Dissipation P D [mW] Maximum Power Dissipation - Ambient Temperature 100 0 500 400 300 200 100 0 0 20 40 60 80 100 0 Ambient Temperature [C] 20 40 60 80 100 Ambient Temperature [C] *THE OSCILLATION WITH A CAPACITIVE LOAD NJM2748/2748A tends to oscillate easily when it uses voltage-follower, and driving capacitive load. The figure below is a "Voltage Gain - Frequency characteristic" in the Voltage-Follower. (It is not the one to guarantee the characteristic of the product.) Especially, it becomes easy to oscillate in the condition that the input voltage (output voltage) is near the minus supply voltage side and the condition with large output sink current. We will recommend use by some circuit gains. Voltage Gain - Frequency + 15 + 10 VO=-10V 5 VO=0V 0 - (V+/V-=15V, Voltage Follower, -10V, Ta=25C) CL=100pF, VO=- 15 Voltage Gain [dB] Voltage Gain [dB] Voltage Gain - Frequency - (V+/V-=15V, Voltage Follower, CL=100pF, ISINK=1mA, Ta=25C) 10 ISINK=5mA ISINK=2mA 5 ISINK=1mA 0 VO=+10V -5 -5 10k -4- 100k 1000k 1M Frequency [HZ] 10000k 10M 10k 100k 1000k 1M Frequency [HZ] 10000k 10M Ver.2007-05-24 NJM2748/2748A IMPORTANT CONSIDERATIONS FOR USE OF NJM2748/2748A *INPUT COMMON MODE VOLTAGE RANGE In this product, the input offset voltage drift is measured based on the input offset voltage at VICM=0V, and the input voltage range that satisfies the common mode rejection ratio 76dB is defined as the input common mode voltage range. + - As an electric characteristic, VICM=-10V~+10V at Supply Voltage V /V =15V is guaranteed. It becomes below formula about the input common mode voltage range when the supply voltage changes. + +VICM: (V supply) - 5 [V] * * * reference - -VICM: (V supply) + 5 [V] * * * reference This figure below is "Input common mode voltage range - Supply voltage characteristics". (It is not the one to guarantee the characteristic of the product.) + + VICM is limited by the absolute maximum rating (V supply) within the input common mode voltage range. Moreover, -VICM tends to rise by lowering of the supply voltage. -VICM) Common Mode Input Voltage Range (- - Supply Voltage Common Mode Input Voltage Range (+VICM) - Supply Voltage (Ta=25C, CMR=76dB) (Ta=25C, CMR=76dB) (- - VICM)- - (V- Supply) [V] 5.0 0.0 -1.0 + (V Supply)- (+VICM) [V] 1.0 -2.0 4.0 3.0 2.0 5 10 15 Supply Voltage V+/V- [V] Ver.2007-05-24 20 5 10 15 20 Supply Voltage V+/V- [V] -5- NJM2748/2748A OFFSET VOLTAGE TRIM CIRCUIT The NJM2748 provides offset voltage trim connections on pin 1 and 5. The offset voltage can be adjusted by connecting Potentiometer as shown in figure. This function adjusts an initial offset voltage, and it doesn't become an improvement of the temperature drift. Please make pin1 and pin5 open when you don't use this function. V+ 2 Trim Resistor R=5.0k R1 R2 7 3 5 R=7.5k R=7.5k 4 1pin 1 5pin 20k -15V V- Input Offset Voltage vs. Trim Resistor R1 V+/V-=15V, Rtrim=5k, R=7.5k, Ta=25C 8 Input Offset Voltage [mV] 6 4 2 0 -2 -4 -6 -8 0 1k 2k 3k 4k Trim Resistor R1 [] 5k *OTHERS For the NJM2748/2748A are high-precision products, a surface leak by dirt and/or condensation on package can have a detrimental effect on precise characteristics of these products. You should pay close attention to environment of storage and usage. -6- Ver.2007-05-24 NJM2748/2748A TYPICAL CHARACTERISTICS Input Offset Voltage Temperature Coefficient Distribution 100 100 20 16 12 8 -20 20 16 12 8 4 0 -4 -8 0 -12 0 -16 20 4 40 20 Distribution [V/C] Distribution [V/C] Input Offset Voltage - Ambient Temperature Input Offset Voltage Drift - Supply Voltage + Input Offset Voltage Drift [V] 1000 1000 0 -1000 - (V+/V-=15V of Reference) - (V /V =15V) 2000 500 Ta=-40C 0 Ta=85C Ta=25C -500 -1000 -2000 -50 -25 0 25 50 75 5 100 10 15 + 20 - Ambient Temperature [C] Supply Voltage V /V [V] Input Offset Voltage Drift Input Offset Voltage Drift - Common Mode Input Voltage - Common Mode Input Voltage + (V /V =15V, VICM=0V of Reference, Ta=25C) + 500 0 -500 - (V+/V-=15V) 1000 Input Offset Voltage Drift [V] 1000 Input Offset Voltage Drift [V] 60 0 40 80 -4 60 - -8 80 -12 Number Of Units 120 + Input Offset Voltage [V] + +25C+ +85C) (V /V =15V, Ta=+ + 140 120 -20 Number of Units - -40C+ +25C) (V /V =15V, Ta=- + 140 -16 + Input Offset Voltage Temperature Coefficient Distribution 500 0 Ta=-40C Ta=25C -500 Ta=85C -1000 -1000 -15 Ver.2007-05-24 -10 -5 0 5 10 Common Mode Input Voltage VICM [V] 15 -15 -10 -5 0 5 10 15 Common Mode Input Voltage [V] -7- NJM2748/2748A TYPICAL CHARACTERISTICS Common Mode Rejection Ratio - Ambient Temperature + - + (V+/V-=15V, VICM=0V -10V) 100 100 90 80 70 -25 0 25 50 75 125 -50 0 25 50 75 100 125 Common Mode Rejection Ratio - Frequency Supply Voltage Rejection Ratio (+Supply) - Frequency - (Input Ripple Voltage=1VPP, V+/V-=15V, AV=60dB) + Ta=-40C 100 80 Ta=25C Ta=-40C 60 Ta=85C 40 20 - (Ripple Voltage=1VPP, V+/V-=15V, AV=40dB) 120 80 Ta=25C 60 40 Ta=85C 20 0 0 0k 10 0k 100 1k 10k 100k 0k 10 1000k 1M 0k 100 1k 10k 100k 1000k 1M Frequency [kHz] Frequency [Hz] Common Mode Rejection Ratio - Frequency Supply Voltage Rejection Ratio (-Supply) - Frequency + - (Input Ripple Voltage=1VPP, V /V =6V, AV=60dB) + 100 100 Ta=25C Ta=-40C 80 60 Ta=85C 40 - (Ripple Voltage=1VPP, V+/V-=15V, AV=40dB ) 120 Supply Voltage Rejection Ratio SVR [dB] Common Mode Rejection Ratio CMR [dB] -25 Ambient Temperature [C] Supply Voltage Rejection Ratio SVR [dB] Common Mode Rejection Ratio CMR [dB] 100 100 20 0 80 Ta=-40C Ta=25C 60 40 Ta=85C 20 0 0k 10 0k 100 1k 10k Frequency [Hz] -8- 80 Ambient Temperature [C] + 120 90 70 -50 120 - (V+/V-=6V 16V) 110 Supply Voltage Rejection Ratio SVR [dB] 110 Common Mode Rejection Ratio CMR [dB] Supply Voltage Rejection Ratio - Ambient Temperature 100k 1000k 1M 0k 10 0k 100 1k 10k 100k 1000k 1M Frequency [Hz] Ver.2007-05-24 NJM2748/2748A TYPICAL CHARACTERISTICS Input Bias Current - Supply Voltage Input Bias Current - Ambient Temperature + (Ta=25C, VICM=0V) 100 (V /V =15V, VICM=0V) Input Bias Current IB [pA] 10000 Input Bias Current IB [pA] - 1000 100 10 50 0 1 -50 -25 0 25 50 75 100 5 125 10 Ambient Temperature [C] Input Bias Current - Common Mode Input Voltage + Input Offset Current IIO [pA] Input Bias Current IB [pA] 0 - 400 200 0 -200 -400 -600 -15 -10 -5 0 5 10 -50 15 0 25 50 75 100 Ambient Temperature [C] Supply Current - Ambient Temperature Supply Current - Supply Voltage - (V /V =15V, Voltage Follower, RL=open) 2.5 2.0 1.5 1.0 125 (Voltage Follower, RL=open) 3.0 Supply Current ICC [mA] 3.0 -25 Common Mode Input Voltage VICM [V] + Supply Current ICC [mA] + (V+/V-=15V, VICM=0V) 600 50 20 Input Offset Current - Ambient Temperature - (V+/V-=15V, Ta=25C) 100 15 Supply Voltage V+/V- [V] 2.5 Ta=25C Ta=85C 2.0 1.5 Ta=-40C 1.0 -50 -25 0 25 50 75 Ambient Temperature [C] Ver.2007-05-24 100 125 5 10 15 20 Supply Voltage V+/V- [V+/V-] -9- NJM2748/2748A TYPICAL CHARACTERISTICS Maximum Output Voltage (+VOM) - Output Source Current + Output Saturation Voltage (+VOS) - Supply Voltage - (V+/V-=15V) 15 (Ta=25C) 1.5 + 14 ISOURCE=10mA Output Saturation Voltage +VOS [V] Maximum Output Voltage +VOM [V] +VOS=(V ) - (+VOM) Ta=-40C 1.0 13 Ta=85C Ta=25C 12 11 ISOURCE=2mA 0.0 0 10 20 30 Output Source Current ISOURCE [mA] 40 5 + (Ta=25C) 2.5 - Output Saturation Voltage - VOS [V] Maximum Output Current - VOM [V] -VOS=(-VOM) - (V ) Ta=25C ISINK=10mA 2.0 -12 Ta=-40C 1.5 -13 -14 ISINK=5mA ISINK=2mA 1.0 0 10 20 30 Output Sink Current ISINK [mA] 40 5 + 15 20 Unity- -Gain Frequency - Ambient Temperature - + (V+/V-=15V, VO=10V, RL=2k) 120 110 100 90 - (V+/V-=15V, 40dBAMP, CL=10pF) 3 Unity- - Gain Frequency fT [MHz] 130 10 Supply Voltage V+/V- [V] Voltage Gain - Ambient Temperature Voltage Gain AV [dB] 20 - Output Saturation Voltage (- -VOS) - Supply Voltage - Ta=85C -11 15 Supply Voltage V /V [V] (V+/V-=15V) -10 10 + -VOM) Maximum Output Voltage (- - Output Sink Current 2.5 2 1.5 1 -50 -25 0 25 50 75 Ambient Temperature [C] - 10 - ISOURCE=5mA 0.5 100 125 -50 -25 0 25 50 75 100 125 Ambient Temperature [C] Ver.2007-05-24 NJM2748/2748A TYPICAL CHARACTERISTICS + Gain 40 30 90 50 45 40 0 Phase 20 -45 10 -90 0 -10 1k 10k 100k 1000k 1M 45 30 0 Phase 20 -45 -90 -135 0 -135 -180 10000k 10M -10 1 10 100 1000 1M -180 10000 10M Frequency [kHz] Voltage Gain - Frequency + (V+/V-=15V, Voltage Follower, RL=2k, Ta=25C) 5 90 10 CL=100pF CL=47pF 0 10 Voltage Gain AV [dB] Voltage Gain AV [dB] 10 - Gain/Phase - Frequency Gain Frequency [Hz] + - (V+/V-=6V, 40dBAMP, CL=100pF, Ta=25C) Phase [deg] Gain/Phase - Frequency Voltage Gain AV [dB] 50 Voltage Gain AV [dB] - Phase [deg] + (V+/V-=15V, 40dBAMP, CL=100pF, Ta=25C) - Voltage Gain - Frequency (V+/V-=6V, Voltage Follower, RL=2k, Ta=25C) CL=100pF 5 CL=47pF 0 CL=10pF CL=10pF -5 -5 0M 100k 1M 10M 0M 100k 1M Frequency [Hz] + Frequency [Hz] Voltage Gain - Frequency + (V+/V-=15V, Voltage Follower, RL=2k, CL=100pF) 5 Ta=-40C 0 Ta=25C 10 Voltage Gain AV [dB] Voltage Gain AV [dB] 10 - 10M - Voltage Gain - Frequency (V+/V-=6V, Voltage Follower, RL=2k, CL=100pF) Ta=-40C 5 Ta=25C Ta=85C 0 Ta=85C -5 0M 100k -5 1M Frequency [Hz] Ver.2007-05-24 10M 0M 100k 1M 10M Frequency [Hz] - 11 - NJM2748/2748A TYPICAL CHARACTERISTICS + Slew Rate - Supply Voltage - 15 +SR 10 (Voltage Follower, VO=1V, RL=2k, Ta=25C) 20 Slew Rate SR [V/s] 20 Slew Rate SR [V/s] Slew Rate - Ambient Temperature (V+/V-=15V, Voltage Follower, VO=1V, RL=2k) -SR 5 +SR 15 -SR 10 5 -50 -25 0 25 50 75 100 125 5 THD+N - Output Voltage + + 1 1kHz 0.01 - (RF=1.8k, V+/V-=15V, AV=+10, RL=open, Ta=25C) 0.1 1kHz 0.01 20Hz 20Hz 0.001 0.01 0.1 1 0.001 0.01 10 Output Voltage VO [Vrms] + 0.1 1 10 Output Voltage VO [Vrms] THD+N - Frequency - + (RF=9k, V+/V-=15V, AV=+10, RL=open, Ta=25C) 0.1 1 THD+N [%] THD+N [%] 1 20 20kHz 20kHz 0.1 15 THD+N - Output Voltage - (RF=9k, V+/V-=15V, AV=+10, RL=open, Ta=25C) THD+N [%] THD+N [%] 1 10 Supply Voltage V+/V- [V] Ambient Temperature [C] VO=7.07Vrms 0.01 THD+N - Frequency - (RF=1.8k, V+/V-=15V, AV=+10, RL=open, Ta=25C) 0.1 VO=7.07Vrms 0.01 VO=5Vrms VO=5Vrms 0.001 0.001 0k 10 0k 100 1k Frequency [Hz] - 12 - 10k 100k 0k 10 0k 100 1k 10k 100k Frequency [Hz] Ver.2007-05-24 NJM2748/2748A TYPICAL CHARACTERISTICS Equivalent Input Noise Voltage - Frequency + Equivalent Input Noise Voltage VNI [nV/ Hz] - (V+/V-=15V, 40dBAMP, RS=100, Ta=25C) 60 50 40 30 20 10 0 1 10 100 1000 1k 10000 10k Frequency [Hz] [CAUTION] The specifications on this data book are only given for information, without any guarantee as regards either mistakes or omissions. The application circuits in this data book are described only to show representative usages of the product and not intended for the guarantee or permission of any right including the industrial rights. Ver.2007-05-24 - 13 -