MAX44259/MAX44260/MAX44261/MAX44263
1.8V, 15MHz Low-Offset,
Low-Power, Rail-to-Rail I/O Op Amps
General Description
The MAX44259/MAX44260/MAX44261/MAX44263 offer a
unique combination of high speed, precision, low noise,
and low-voltage operation making them ideally suited
for a large number of signal processing functions such
as filtering and amplification of signals in portable and
industrial equipment.
The devices’ rail-to-rail input/outputs and low noise
guarantee maximum dynamic range in demanding appli-
cations such as 12- to 14-bit SAR ADC drivers. Unlike
traditional rail-to-rail input structures, input crossover
distortion is absent due to an optimized input stage with
an ultra-quiet charge pump.
The MAX44260 includes a fast-power-on shutdown mode
for further power savings. The MAX44261 offers a unique
on-demand calibration pin where the user can invoke
self-trimming of the input offset voltage. The MAX44263
is a dual amplifier.
The family of parts operates from a supply range of 1.8V
to 5.5V over the -40NC to +125NC temperature range
and can operate down to 1.7V over the 0NC to +70NC
temperature range. The MAX44259 is offered in a 5-pin
SOT23 package. The MAX44260/MAX44261 are avail-
able in small, 6-pin SC70 packages. The MAX44260 is
also available in a 1mm x 1.5mm thin µDFN (ultra-thin
LGA) package. The MAX44263 is available in a small
8-pin SC70 package.
Benefits and Features
S Low Noise for Higher System Accuracy
• 12.7nV/√Hz Input Voltage-Noise Density
• 1.2fA/√Hz Input Current-Noise Density
• 50µV (max) VOS at +25°C
• 110dB Total Harmonic Distortion
S 15MHz Unity-Gain Bandwidth Enables for High-
Bandwidth Applications
S Low Power Extends the Battery Life of Portable
Equipment
• 500fA Low Input Bias Current
• 750µA Quiescent Current per Amplifier
• < 1µA Supply Current in Shutdown
S On-Demand VOS Self-Calibration (MAX44261)
S Saves Board Space
• Small, 2mm x 2mm SC70 and 1mm x 1.5mm
Thin µDFN (MAX44260) and SOT23 (MAX44259)
Packages
S Wide Supply Range from 1.8V to 5.5V Simplifies
Power-Supply Requirements
Applications
Notebooks
3G/4G Handsets
Portable Media Players
Portable Medical Instruments
Battery-Operated Devices
Analog-to-Digital Converter Buffers
Transimpedance Amplifiers
19-5873; Rev 9; 3/15
Ordering Information appears at end of data sheet.
Typical Application Circuit
Visit www.maximintegrated.com/products/patents for
product patent marking information.
EVALUATION KIT AVAILABLE
MAX44260
15nF
+3.3V
330pF
3.3nF
SALLEN-KEY FILTERCORNER FREQUENCY = 10kHz
22kI2.4kI
10kIADC
MAX11645
For pricing, delivery, and ordering information, please contact Maxim Direct
at 1-888-629-4642, or visit Maxim’s website at www.maximintegrated.com.
2Maxim Integrated
MAX44259/MAX44260/MAX44261/MAX44263
1.8V, 15MHz Low-Offset,
Low-Power, Rail-to-Rail I/O Op Amps
IN+, IN-, OUT .................................(VSS - 0.3V) to (VDD + 0.3V)
VDD to VSS ...............................................................-0.3V to +6V
SHDN, CAL .............................................................-0.3V to +6V
Output to Short-Circuit Ground Duration .............................. 10s
Continuous Input Current into Any Pin ............................ Q20mA
Continuous Power Dissipation (TA = +70NC)
SC70 (derate 3.1mW/NC above +70NC) ......................245mW
SOT23 (derate 3.9mW/NC above +70NC) ................. 312.6mW
6-Pin Thin µDFN (Ultra-Thin LGA)
(derate 2.1mW/NC above +70NC) .............................110.2mW
Operating Temperature Range ........................ -40NC to +125NC
Junction Temperature .....................................................+150NC
Lead Temperature (soldering, 10s) ................................+300NC
Soldering Temperature (reflow) ......................................+260NC
ABSOLUTE MAXIMUM RATINGS
Note 1: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-layer
board. For detailed information on package thermal considerations, refer to www.maximintegrated.com/thermal-tutorial.
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional opera-
tion 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.
SC70
Junction-to-Ambient Thermal Resistance (BJA) .... 326.5NC/W
Junction-to-Case Thermal Resistance (BJC) .............115NC/W
SOT23
Junction-to-Ambient Thermal Resistance (BJA) .... 255.9NC/W
Junction-to-Case Thermal Resistance (BJC) ...............81NC/W
Thin µDFN (Ultra-Thin LGA)
Junction-to-Ambient Thermal Resistance (BJA) ....... 470NC/W
PACKAGE THERMAL CHARACTERISTICS (Note 1)
ELECTRICAL CHARACTERISTICS
(VDD = 3.3V, VSS = 0V, VIN+ = VIN- = VDD/2, RL = 10kI to VDD/2, VCAL = VSHDN = VDD, TA = -40NC to +125NC. Typical values are
at TA = +25NC, unless otherwise noted.) (Note 2)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
DC CHARACTERISTICS
Input Voltage Range VIN+ VIN- Guaranteed by CMRR test -0.1 VDD
+ 0.1 V
Input Offset Voltage (Note 3) VOS
TA = +25NC 10 50
FV
TA = -40°C to +125°C after calibration 100
TA = -40°C to
+125°C
MAX44260/MAX44261 500
MAX44259/MAX44263 800
Input Offset Voltage Drift
(Note 3) VOS - TC MAX44260/MAX44261 0.8 5 FV/NC
MAX44259/MAX44263 1 8
Input Bias Current (Note 3) IB
TA = +25NC
MAX44259/
MAX44260/MAX44261 0.01 0.5
pA
MAX44263 0.01 0.5
TA = -40NC to +85NC 10
TA = -40NC to
+125NC
MAX44259/
MAX44260/MAX44261 100
MAX44263 160
Input Capacitance CIN 0.4 pF
Common-Mode Rejection Ratio CMRR VCM = -0.1V to (VDD + 0.1V) 75 90 dB
Input Resistance RIN
Common mode VCM = -0.1V to
(VDD + 0.1V) 1011
Ω
Differential mode 1012
3Maxim Integrated
MAX44259/MAX44260/MAX44261/MAX44263
1.8V, 15MHz Low-Offset,
Low-Power, Rail-to-Rail I/O Op Amps
ELECTRICAL CHARACTERISTICS (continued)
(VDD = 3.3V, VSS = 0V, VIN+ = VIN- = VDD/2, RL = 10kI to VDD/2, VCAL = VSHDN = VDD, TA = -40NC to +125NC. Typical values are
at TA = +25NC, unless otherwise noted.) (Note 2)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Open-Loop Gain AOL
0.4V P VOUT
P VDD - 0.4V,
ROUT = 10kI
MAX44259/
MAX44260/MAX44261 100 115
dB
MAX44263 97 115
0.4V P VOUT
P VDD - 0.4V,
ROUT = 600I
MAX44259/
MAX44260/MAX44261 91 100
MAX44263 86 100
0.4V P VOUT P VDD - 0.4V, ROUT = 32I80
Output Short-Circuit Current ISC To VDD or VSS 50 mA
Output Voltage Swing
VOL -
VSS
ROUT = 10kI20
mV
ROUT = 600I50
ROUT = 32I400 700
VDD -
VOH
ROUT = 10kI
MAX44259/
MAX44260/MAX44261 10
MAX44263 10
ROUT = 600I
MAX44259/
MAX44260/MAX44261 40
MAX44263 50
ROUT = 32I400 800
AC CHARACTERISTICS
Input Voltage-Noise Density enf = 10kHz 12.7 nV/√Hz
Input Current-Noise Density inf = 10kHz 1.2 fA/√Hz
Gain-Bandwidth Product GBWP 15 MHz
Slew Rate SR 7 V/Fs
Settling Time VOUT = 2VP-P, VDD = 3.3V, AV = 1V/V,
CL = 30pF (load), settle to 0.01% 1.7 µs
Capacitive Loading CLOAD No sustained oscillation 300 pF
Total Harmonic Distortion THD f = 10kHz, VO = 2VP-P, AV = 1, ROUT = 10kI-110 dB
Output Transient Recovery Time DVOUT = 0.2V, VDD = 3.3V, AV = 1V/V;
RS = 20Ω, CL = 1nF (load) 1 µs
POWER-SUPPLY CHARACTERISTICS
Power-Supply Range VDD
Guaranteed by PSRR 1.8 5.5 V
TA = 0NC to +70NC 1.7 5.5
Power-Supply Rejection Ratio PSRR VCM = VDD/2
MAX44259/MAX44260/
MAX44261 82 95 dB
MAX44263 76 95
4Maxim Integrated
MAX44259/MAX44260/MAX44261/MAX44263
1.8V, 15MHz Low-Offset,
Low-Power, Rail-to-Rail I/O Op Amps
Typical Operating Characteristics
(VDD = 3.3V, VSS = 0V, VIN+ = VIN- = VDD/2, RL = 10kI to VDD/2, VCAL = VSHDN = VDD, TA = -40NC to +125NC. Typical values are at
TA = +25NC, unless otherwise noted. All devices are 100% production tested at TA = +25NC. Temperature limits are guaranteed by design.)
ELECTRICAL CHARACTERISTICS (continued)
(VDD = 3.3V, VSS = 0V, VIN+ = VIN- = VDD/2, RL = 10kI to VDD/2, VCAL = VSHDN = VDD, TA = -40NC to +125NC. Typical values are
at TA = +25NC, unless otherwise noted.) (Note 2)
Note 2: All devices are 100% production tested at TA = +25NC. Temperature limits are guaranteed by design.
Note 3: Guaranteed by design.
Note 4: MAX44259/MAX44260/MAX44261 only.
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Quiescent Current IDD
MAX44259/MAX44260/MAX44261 750 1200 µA
MAX44263 (per amplifier) 650 1100
Shutdown Supply Current ISHDN (Note 4) 1 µA
Shutdown Input Low VIL (Note 4) 0.5 V
Shutdown Input High VIH (Note 4) 1.3 V
Output Leakage Current in
Shutdown ISHDN (Note 4) 100 pA
Shutdown Input Bias Current IIL/IIH
MAX44260 1 µA
MAX44261 0.1
Shutdown Turn-On Time
(Note 4) tSHDN TA = +25NC (Note 3) 14.4 18.9 µs
TA = -40°C to +125°C (Note 3) 26.7
Turn-On Time (Note 4) tON
TA = +25NC (Note 3) 9.7 15.2 ms
TA = -40°C to +125°C (Note 3) 18.4
INPUT OFFSET VOLTAGE
vs. COMMON-MODE VOLTAGE
MAX44260 toc01
COMMON-MODE VOLTAGE (V)
INPUT OFFSET VOLTAGE (µV)
3.02.52.01.51.00.50
-40
-20
0
20
40
60
-60
-0.5 3.5
TA = +125°C
TA = +25°C
TA = -40°C
INPUT OFFSET VOLTAGE
vs. SUPPLY VOLTAGE
MAX44260 toc02
SUPPLY VOLTAGE (V)
INPUT OFFSET VOLTAGE (µV)
5.04.53.5 4.02.5 3.02.0
-80
-60
-40
-20
0
20
40
60
80
100
-100
1.5 5.5
TA = +125°C
TA = +25°C
TA = -40°C
INPUT VOS HISTOGRAM
MAX44260 toc03
INPUT OFFSET VOLTAGE (µV)
PERCENT OCCURRENCE (%)
5
10
15
20
25
0
-15 -10 -5 05
10 15 20 25
5Maxim Integrated
MAX44259/MAX44260/MAX44261/MAX44263
1.8V, 15MHz Low-Offset,
Low-Power, Rail-to-Rail I/O Op Amps
Typical Operating Characteristics (continued)
(VDD = 3.3V, VSS = 0V, VIN+ = VIN- = VDD/2, RL = 10kI to VDD/2, VCAL = VSHDN = VDD, TA = -40NC to +125NC. Typical values are at
TA = +25NC, unless otherwise noted. All devices are 100% production tested at TA = +25NC. Temperature limits are guaranteed by design.)
OUTPUT-VOLTAGE LOW
vs. OUTPUT SINK CURRENT
(VOL - VEE, VCC = 3.3V)
MAX44260 toc07
OUTPUT SINK CURRENT (mA)
OUTPUT-VOLTAGE LOW (mV)
101
20
40
60
80
100
120
140
160
180
200
0
0.1 100
TA = +125°C
TA = +25°C
TA = -40°C
INPUT OFFSET DRIFT HISTOGRAM
MAX44260 toc04
INPUT OFFSET DRIFT (µV/°C)
PERCENT OCCURRENCE (%)
2
4
6
8
10
12
14
16
18
0
-2
-1.8
-1.5
-1.3
-1
-0.8
-0.5
-0.3
0
0.25
0.50
0.75
1.00
1.25
OUTPUT-VOLTAGE LOW
vs. OUTPUT SINK CURRENT
(VOL - VEE, VCC = 5V)
MAX44260 toc08
OUTPUT SINK CURRENT (mA)
OUTPUT-VOLTAGE LOW (mV)
101
20
40
60
80
100
120
140
160
180
200
0
0.1 100
TA = +125°C
TA = -40°C
TA = +25°C
INPUT BIAS CURRENT
vs. COMMON-MODE VOLTAGE
MAX44260 toc05
COMMON-MODE VOLTAGE (V)
INPUT BIAS CURRENT (pA)
3.02.51.5 2.00.5 1.00
-80
-60
-40
-20
0
20
40
60
80
100
-100
-0.5 3.5
TA = +85°CTA = -40°C
TA = +125°C
TA = +25°C
OUTPUT-VOLTAGE HIGH
vs. OUTPUT SOURCE CURRENT
(VCC - VOH, VCC = 1.8V)
MAX44260 toc09
OUTPUT SOURCE CURRENT (mA)
OUTPUT-VOLTAGE HIGH (mV)
101
20
40
60
80
100
120
140
160
180
200
0
0.1 100
TA = +25°C
TA = +125°C
TA = -40°C
OUTPUT-VOLTAGE LOW
vs. OUTPUT SINK CURRENT
(VOL - VEE, VCC = 1.8V)
MAX44260 toc06
OUTPUT SINK CURRENT (mA)
OUTPUT-VOLTAGE LOW (mV)
101
20
40
60
80
100
120
140
160
180
200
0
0.1 100
TA = +125°C
TA = +25°C
TA = -40°C
6Maxim Integrated
MAX44259/MAX44260/MAX44261/MAX44263
1.8V, 15MHz Low-Offset,
Low-Power, Rail-to-Rail I/O Op Amps
Typical Operating Characteristics (continued)
(VDD = 3.3V, VSS = 0V, VIN+ = VIN- = VDD/2, RL = 10kI to VDD/2, VCAL = VSHDN = VDD, TA = -40NC to +125NC. Typical values are at
TA = +25NC, unless otherwise noted. All devices are 100% production tested at TA = +25NC. Temperature limits are guaranteed by design.)
SHUTDOWN SUPPLY CURRENT
vs. SUPPLY VOLTAGE
(VSHDN = VEE)
MAX44260 toc13
SUPPLY VOLTAGE (V)
SHUTDOWN SUPPLY CURRENT (µA)
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
0
5.04.54.03.53.02.52.01.5 5.5
TA = -40°C
TA = +125°C
TA = +25°C
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
MAX44260 toc16
FREQUENCY (Hz)
PSRR (dB)
10M1M100k10k1k100
-100
-80
-60
-40
-20
0
-120
10 100M
OPEN-LOOP GAIN
vs. FREQUENCY
MAX44260 toc14
FREQUENCY (Hz)
OPEN-LOOP GAIN (dB)
10M 100M1M100k10k1k10010
20
40
60
80
100
120
0
1
DC CMRR AND PSRR
vs. TEMPERATURE
MAX44260 toc17
TEMPERATURE (°C)
REJECTION RATIO (dB)
1007550250-25
-98
-96
-94
-92
-90
-100
-50 125
DC CMRR
DC PSRR
COMMON-MODE REJECTION RATIO
vs. FREQUENCY
MAX44260 toc15
FREQUENCY (Hz)
CMRR (dB)
-100
-80
-60
-40
-20
0
-120
10M 100M1M100k10k1k
100
10
INPUT VOLTAGE-NOISE DENSITY
vs. FREQUENCY
MAX44260 toc18
FREQUENCY (Hz)
INPUT VOLTAGE-NOISE DENSITY (nV/√Hz)
1M100k10k1k100
50
100
150
200
250
300
350
400
450
500
0
10 10M
OUTPUT-VOLTAGE HIGH
vs. OUTPUT SOURCE CURRENT
(VCC - VOH, VCC = 3.3V)
MAX44260 toc10
OUTPUT SOURCE CURRENT (mA)
OUTPUT-VOLTAGE HIGH (mV)
101
20
40
60
80
100
120
140
160
180
200
0
0.1 100
TA = +25°C
TA = +125°C TA = -40°C
OUTPUT-VOLTAGE HIGH
vs. OUTPUT SOURCE CURRENT
(VCC - VOH, VCC = 5V)
MAX44260 toc11
OUTPUT SOURCE CURRENT (mA)
OUTPUT-VOLTAGE HIGH (mV)
101
20
40
60
80
100
120
140
160
180
200
0
0.1 100
TA = +25°C
TA = +125°C
TA = -40°C
SUPPLY CURRENT vs. SUPPLY VOLTAGE
MAX44260 toc12
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (µA)
5.04.54.03.53.02.52.0
650
700
750
800
850
900
600
1.5 5.5
TA = -40°C
TA = +125°C
TA = +25°C
7Maxim Integrated
MAX44259/MAX44260/MAX44261/MAX44263
1.8V, 15MHz Low-Offset,
Low-Power, Rail-to-Rail I/O Op Amps
Typical Operating Characteristics (continued)
(VDD = 3.3V, VSS = 0V, VIN+ = VIN- = VDD/2, RL = 10kI to VDD/2, VCAL = VSHDN = VDD, TA = -40NC to +125NC. Typical values are at
TA = +25NC, unless otherwise noted. All devices are 100% production tested at TA = +25NC. Temperature limits are guaranteed by design.)
0.1Hz TO 10Hz OUTPUT-VOLTAGE NOISE
MAX44260 toc19
2µV/div
4s/div
TOTAL HARMONIC DISTORTION
vs. FREQUENCY (VIN = 2VP-P)
MAX44260 toc22
FREQUENCY (Hz)
THD (dB)
10k1k10 100
-115
-110
-105
-100
-95
-90
-85
-80
-120
1 100k
VCC = 5.5V
VCC = 3.3V
INPUT CURRENT-NOISE DENSITY
vs. FREQUENCY
MAX44260 toc20
FREQUENCY (Hz)
INPUT-CURRENT NOISE DENSITY (fA/√Hz)
10k1000100
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
0
10 100k
SMALL-SIGNAL TRANSIENT RESPONSE
MAX44260 toc23
INPUT
50mV/div
VCC/2
OUTPUT
50mV/div
VCC/2
200ns/div
TOTAL HARMONIC DISTORTION
vs. INPUT AMPLITUDE
(f = 10kHz, VCC = 5.5V, AV = 1V/V)
MAX44260 toc21
INPUT AMPLITUDE (V)
THD (dB)
4.54.00.5 1.0 1.5 2.5 3.02.0 3.5
85
90
95
100
105
110
115
120
80
0 5.0
LARGE-SIGNAL TRANSIENT RESPONSE
MAX44260 toc24
INPUT
1V/div
VCC/2
OUTPUT
500mV/div
VCC/2
100ns/div
8Maxim Integrated
MAX44259/MAX44260/MAX44261/MAX44263
1.8V, 15MHz Low-Offset,
Low-Power, Rail-to-Rail I/O Op Amps
Typical Operating Characteristics (continued)
(VDD = 3.3V, VSS = 0V, VIN+ = VIN- = VDD/2, RL = 10kI to VDD/2, VCAL = VSHDN = VDD, TA = -40NC to +125NC. Typical values are at
TA = +25NC, unless otherwise noted. All devices are 100% production tested at TA = +25NC. Temperature limits are guaranteed by design.)
PERCENT OVERSHOOT
vs. LOAD RESISTANCE (VIN = 100mVP-P)
MAX44260 toc25
LOAD RESISTANCE (I)
OVERSHOOT (%)
10k1k
2
4
6
8
10
12
14
16
18
20
0
100 100k
POWER-UP TIME
MAX44260 toc28
VCC
2V/div
OUTPUT
500mV/div
GND
GND
4ms/div
TURN-ON TIME FROM SHUTDOWN
MAX44260 toc29
OUTPUT
500mV/div
VSS
VSS
10µs/div
SHDN
2V/div
STABILITY vs. CAPACITIVE LOAD
AND ISOLATION RESISTANCE
MAX44260 toc26
CAPACITIVE LOAD (pF)
ISOLATION RESISTANCE (I)
350030002000 25001000 1500500
2
4
6
8
10
12
14
16
18
20
22
24
26
28
30
0
0 4000
STABLE
UNSTABLE
STABILITY vs. CAPACITIVE
AND RESISTIVE LOAD
MAX44260 toc27
CAPACITIVE LOAD (pF)
RESISTIVE LOAD (I)
10k1k
10
100
1k
10k
100k
1
100 100k
STABLE
UNSTABLE
9Maxim Integrated
MAX44259/MAX44260/MAX44261/MAX44263
1.8V, 15MHz Low-Offset,
Low-Power, Rail-to-Rail I/O Op Amps
Pin Description
Pin Configurations
PIN
NAME FUNCTION
MAX44259 MAX44260 MAX44261 MAX44263
3 1 1 — IN+ Positive Input
2 2 2 4 VSS Negative Power Supply. Bypass with a 0.1FF capacitor to
ground.
4 3 3 — IN- Negative Input
1 4 4 — OUT Output
— — 5 — CAL Active-Low Calibrate Input
— 5 — — SHDN Active-Low Shutdown
5 6 6 8 VDD Positive Power Supply. Bypass with a 0.1FF capacitor to
ground.
— — — 1 OUTA Channel A Output
— — — 2 INA- Channel A Negative Input
— — — 3 INA+ Channel A Positive Input
— — — 5 INB+ Channel B Positive Input
— — — 6 INB- Channel B Negative Input
— — — 7 OUTB Channel B Output
TOP VIEW
NOT TO SCALE
SC70
VSS 2
IN+ 1
IN- 3
SHDN
5
VDD
6
OUT
4
MAX44260
SC70
VSS 2
IN+ 1
IN- 3
CAL
5
VDD
++
6
OUT
4
MAX44261
123
654
VDD OUTSHDN
IN+
+
IN-VSS
Thin µDFN
(Ultra-Thin LGA)
MAX44260
SC70
TOP VIEW
MAX44263
INA+
1
2
INA-
OUTA
3INB-
8
7
VDD
OUTB
6
VSS 4INB+
5
+
MAX44259
SOT23
VSS
IN+
1OUT
2
3 IN-
5V
DD
4
+
10Maxim Integrated
MAX44259/MAX44260/MAX44261/MAX44263
1.8V, 15MHz Low-Offset,
Low-Power, Rail-to-Rail I/O Op Amps
Figure 1. Comparing the Input Structure of the MAX44260 to Standard Op-Amp Inputs
Figure 2. Crossover Distortion of Typical Amplifiers
Detailed Description
The MAX44259/MAX44260/MAX44261/MAX44263 are
high-speed low-power op amps ideal for signal process-
ing applications due to the device’s high precision and
low-noise CMOS inputs. The devices self-calibrate on
power-up to eliminate effects of temperature and power-
supply variation.
The MAX44260 also features a low-power shutdown
mode that greatly reduces quiescent current while the
device is not operational and recovers in 30µs.
The MAX44261 features a user-selectable self-calibration
input that shuts down the device and allows it to be reca-
librated at any time. The calibration routine takes 10ms.
Crossover Distortion
These op amps feature a low-noise integrated charge
pump that creates an internal voltage rail 1V above
VDD, which is used to power the input differential
pair of PMOS transistors as shown in Figure 1. Such
a unique architecture eliminates crossover distor-
tion common in traditional CMOS input architecture
(Figure 2), especially when used in a noninverting
configuration, such as for Sallen-Key filters.
The charge pump’s operating frequency lies well above
the unity-gain frequency of the amplifier. Thanks to its high-
frequency operation and ultra-quiet circuitry, the charge
pump generates little noise, does not require external
components, and is entirely transparent to the user.
STANDARD INPUT STRUCTURE MAX44260 INPUTS STRUCTURE
INTERNAL
CHARGE
PUMP
CROSSOVER
DISTORTION
MAX44261
TIME
AMPLIFIER OUTPUT
11Maxim Integrated
MAX44259/MAX44260/MAX44261/MAX44263
1.8V, 15MHz Low-Offset,
Low-Power, Rail-to-Rail I/O Op Amps
Figure 3. CAL vs. SHDN Input Operation
Applications Information
Power-Up Autotrim
The ICs feature an automatic trim that self-calibrates the
VOS of these devices to less than 50FV of input offset
voltage on power-up. This self-calibration feature allows
the device to eliminate input offset voltage effects due
to power supply and operating temperature variation
simply by cycling its power. The autotrim sequence takes
approximately 10ms to complete and is triggered by an
internal power-on-reset (POR) circuitry. During this time,
the inputs and outputs are put into high impedance and
left unconnected. The MAX44261 can also be forced into
a self-calibration cycle by pulling the CAL input low for
1µs. This input also puts the part into shutdown mode.
Shutdown Operation
The MAX44260 features an active-low shutdown mode
that puts both inputs and outputs into high impedance
and substantially lowers the quiescent current to less
than 1FA. Putting the output into high impedance allows
multiple outputs to be multiplexed onto a single output
line without the additional external buffers. The device
does not self-calibrate when exiting shutdown mode
and retains its power-up trim settings. Figure 3 shows
that the device also recovers from shutdown in under
30Fs.
The MAX44261 features a recalibrate input that acts the
same as the shutdown mode of the MAX44260. However,
when the input is pulled low, the device goes through a
self-calibration sequence again (Figure 3).
The shutdown logic levels of the devices are indepen-
dent of supply, allowing the shutdown feature of the
device to operate off of a 1.8V or 3.3V microcontroller,
regardless of supply voltage.
Rail-to-Rail Input/Output
The input voltage range of the ICs extends 100mV
above VDD and below VSS. The wide input common-
mode voltage range allows the op amp to be used as
a buffer and as a differential amplifier in a wide-variety
of signal processing applications. Output voltage high/
low is designed to be only 50mV above VSS and below
VDD allowing maximum dynamic range in single-supply
applications. The high output current and capacitance
drive capability of the devices make them ideal as an
ADC driver and a line driver.
VDD/2
0V
0V
VSHDN/VCAL
MAX44261
OUTPUT
30µs
10ms
AUTOTRIM
SEQUENCE
RECALIBRATED
AMPLIFIER
ACTIVE
MAX44260
OUTPUT
VDD/2
0V
VDD
FAST RECOVERY
AMPLIFIER
ACTIVE
12Maxim Integrated
MAX44259/MAX44260/MAX44261/MAX44263
1.8V, 15MHz Low-Offset,
Low-Power, Rail-to-Rail I/O Op Amps
Ordering Information
+Denotes a lead(Pb)-free/RoHS-compliant package.
Chip Information
PROCESS: BiCMOS
Input Bias Current
The ICs feature a high-impedance CMOS input stage
and a specialized ESD structure that allows low-input
bias current operation at low-input, common-mode volt-
ages. Low-input bias current is useful when interfacing
with high-ohmic sensors. It is also beneficial for design-
ing transimpedance amplifiers for photodiode sensors.
This makes these devices ideal for ground-referenced
medical and industrial sensor applications.
Active Filters
The MAX44259/MAX44260/MAX44261/MAX44263 are
ideal for a wide variety of active filter circuits that make
use of their wide bandwidth, rail-to-rail input/output
stages and high-impedance CMOS inputs. The Typical
Application Circuit shows an example Sallen-Key active
filter circuit with a corner frequency of 10kHz. At low
frequencies, the amplifier behaves like a simple low-
distortion noninverting buffer, while its high bandwidth
gives excellent stopband attenuation above its corner
frequency. See the Typical Application Circuit.
Driver for Interfacing with
the MAX11645 ADC
The ICs’ tiny size and low noise makes them a good fit for
driving 12- to 16-bit resolution ADCs in space-constrained
applications. The Typical Application Circuit shows the
MAX44260 amplifier output connected to a lowpass filter
driving the MAX11645 ADC. The MAX11645 is part of a
family of 3V and 5V, 12-bit and 10-bit, 2-channel ADCs.
The MAX11645 offers sample rates up to 94ksps and
measures two single-ended inputs or one differential
input. These ADCs dissipate 670FA at the maximum
sampling rate, but just 6FA at 1ksps and 0.5FA in shut-
down. Offered in the ultra-tiny, 1.9mm x 2.2mm WLP and
FMAX-8 packages, the MAX11645 ADCs are an ideal fit
to pair with the MAX44260/MAX44261/MAX44263 ampli-
fiers in portable applications.
Where higher resolution is required, refer to the MAX1069
(14-bit) and MAX1169 (16-bit) ADC families.
PART TEMP RANGE PIN-
PACKAGE
TOP
MARK
MAX44259AUK+ -40NC to +125NC 5 SOT23 +AMFX
MAX44260AXT+ -40NC to +125NC 6 SC70 +AEB
MAX44260AYT+ -40NC to +125NC6 Thin FDFN
(Ultra-Thin LGA) +AY
MAX44261AXT+ -40NC to +125NC 6 SC70 +AEC
MAX44263AXA+ -40NC to +125NC 8 SC70 +AAG
13Maxim Integrated
MAX44259/MAX44260/MAX44261/MAX44263
1.8V, 15MHz Low-Offset,
Low-Power, Rail-to-Rail I/O Op Amps
Package Information
For the latest package outline information and land patterns (footprints), go to www.maximintegrated.com/packages. Note that a “+”,
“#”, or “-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing
pertains to the package regardless of RoHS status.
PACKAGE TYPE PACKAGE CODE OUTLINE NO. LAND PATTERN NO.
5 SOT23 U5N+4 21-0057 90-0174
6 SC70 X6SN+1 21-0077 90-0189
6 Thin FDFN
(Ultra-Thin LGA) Y61A1+1 21-0190 90-0233
8 SC70 X8CN+1 21-0460 90-0348
Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent
licenses are implied. Maxim Integrated reserves the right to change the circuitry and specifications without notice at any time. The parametric values (min and
max limits) shown in the Electrical Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance.
Maxim Integrated 160 Rio Robles, San Jose, CA 95134 USA 1-408-601-1000 14
© 2015 Maxim Integrated Products, Inc. The Maxim logo and Maxim Integrated are trademarks of Maxim Integrated Products, Inc.
MAX44259/MAX44260/MAX44261/MAX44263
1.8V, 15MHz Low-Offset,
Low-Power, Rail-to-Rail I/O Op Amps
Revision History
REVISION
NUMBER
REVISION
DATE DESCRIPTION PAGES
CHANGED
0 6/11 Initial release —
1 8/11 Added thin µDFN (ultra-thin LGA) package and updated slew rate and TOC 29 1, 2, 3, 8, 9, 12
2 10/11 Removed future product information from data sheet 12
3 2/12 Revised Electrical Characteristics and the Power-Up Autotrim section 2, 3, 11
4 7/12 Revised Electrical Characteristics and Typical Operating Characteristics 3, 6
5 10/12 Added the MAX44263 and revised the Electrical Characteristics, Pin Description, and
Pin Configuration.1–17
6 12/12 Revised Typical Operating Characteristics 7
7 9/14 Added the MAX44259 to data sheet. 1–14
8 12/14 Revised General Description and Benefits and Features section 1
9 3/15 Revised Electrical Characteristics 2
