MAX44260/MAX44261
1.8V 15MHz Low-Offset,
Low-Power, Rail-to-Rail I/O Op Amps
1
General Description
The MAX44260/MAX44261 offer a unique combination of
high speed, precision, low noise, and low-voltage opera-
tion making them ideally suited for a large number of
signal processing functions such as filtering and ampli-
fication of signals in portable and industrial equipment.
The amplifiers feature an input offset of less than 50FV
and a high-gain bandwidth product of 15MHz while
maintaining a low 1.8V supply rail. The devices’ rail-to-
rail input/outputs and low noise guarantee maximum
dynamic range in demanding applications 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 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 tem-
perature range. The MAX44260/MAX44261 are available
in small, 6-pin SC70 packages. The MAX44260 is also
available in a 1mm x 1.5mm thin µDFN (ultra-thin LGA)
package.
Features
S Low 1.8V Supply Rail Over the -40°C to +125°C
Range
1.7V Supply Rail Over the 0°C to +70°C Range
S 15MHz Unity-Gain Bandwidth
S Low 12.7nV/√Hz Input Voltage-Noise Density
S Low 1.2fA/√Hz Input Current-Noise Density
S Low 50µV (max) VOS at +25°C
S On-Demand VOS Self-Calibration (MAX44261)
S 500fA Low Input Bias Current
S 750µA Quiescent Current per Amplifier
S < 1µA Supply Current in Shutdown
S Small, 2mm x 2mm SC70 and 1mm x 1.5mm Thin
µDFN (MAX44260) Packages
S Low 110dB Total Harmonic Distortion
Applications
Notebooks
3G/4G Handsets
Portable Media Players
Portable Medical Instruments
Battery-Operated Devices
Analog-to-Digital Converter Buffers
Transimpedance Amplifiers
General-Purpose Signal Processing
19-5873; Rev 4; 7/12
Ordering Information appears at end of data sheet.
Typical Application Circuit
For related parts and recommended products to use with this part, refer to: www.maxim-ic.com/MAX44260.related
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.maxim-ic.com.
2
MAX44260/MAX44261
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
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.maxim-ic.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
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 VOS
TA = +25NC 10 50
FV
TA = -40°C to +125°C after calibration 100
TA = -40°C to +125°C 500
Input Offset Voltage Drift VOS - TC 0.8 5 FV/NC
Input Bias Current (Note 3) IB
TA = +25NC 0.01 0.5
pATA = -40NC to +85NC 10
TA = -40NC to +125NC 100
Input Capacitance CIN 0.4 pF
Common-Mode Rejection Ratio CMRR VCM = -0.1V to (VDD + 0.1V) 75 90 dB
Open-Loop Gain AOL
0.4V P VOUT P VDD - 0.4V, ROUT = 10kI100 115
dB0.4V P VOUT P VDD - 0.4V, ROUT = 600I91 100
0.4V P VOUT P VDD - 0.4V, ROUT = 32I80
Output Short-Circuit Current ISC To VDD or VSS 50 mA
3
MAX44260/MAX44261
1.8V 15MHz Low-Offset,
Low-Power, Rail-to-Rail I/O Op Amps
Note 2: All devices are 100% production tested at TA = +25NC. Temperature limits are guaranteed by design.
Note 3: 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)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Output Voltage Swing
VOL -
VSS
ROUT = 10kI20
mV
ROUT = 600I50
ROUT = 32I400 700
VDD -
VOH
ROUT = 10kI10
ROUT = 600I40
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 82 95 dB
Quiescent Current IDD 750 1200 µA
Shutdown Supply Current ISHDN MAX44260/MAX44261 only 1 µA
Shutdown Input Low VIL 0.5 V
Shutdown Input High VIH 1.3 V
Output Leakage Current in
Shutdown ISHDN 100 pA
Shutdown Input Bias Current IIL/IIH
MAX44260 1 µA
MAX44261 0.1
Shutdown Turn-On Time tSHDN
TA = +25NC (Note 3) 14.4 18.9 µs
TA = -40°C to +125°C (Note 3) 26.7
Turn-On Time tON
TA = +25NC (Note 3) 9.7 15.2 ms
TA = -40°C to +125°C (Note 3) 18.4
4
MAX44260/MAX44261
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.)
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 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
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 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
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
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
5
MAX44260/MAX44261
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
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 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
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
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
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
6
MAX44260/MAX44261
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
7
MAX44260/MAX44261
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
0.5µV/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
8
MAX44260/MAX44261
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
9
MAX44260/MAX44261
1.8V 15MHz Low-Offset,
Low-Power, Rail-to-Rail I/O Op Amps
Pin Description
Pin Configurations
PIN NAME FUNCTION
MAX44260 MAX44261
1 1 IN+ Positive Input
2 2 VSS Negative Power Supply. Bypass with a 0.1FF capacitor to ground.
3 3 IN- Negative Input
4 4 OUT Output
— 5 CAL Active-Low Calibrate Input
5 — SHDN Active-Low Shutdown
6 6 VDD Positive Power Supply. Bypass with a 0.1FF capacitor to ground.
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
10
MAX44260/MAX44261
1.8V 15MHz Low-Offset,
Low-Power, Rail-to-Rail I/O Op Amps
Detailed Description
The MAX44260/MAX44261 are high-speed low-power op
amps ideal for signal processing 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.
Figure 1. Comparing the Input Structure of the MAX44260 to Standard Op-Amp Inputs
Figure 2. Crossover Distortion of Typical Amplifiers
STANDARD INPUT STRUCTURE MAX44260 INPUTS STRUCTURE
INTERNAL
CHARGE
PUMP
CROSSOVER
DISTORTION
MAX44261
TIME
AMPLIFIER OUTPUT
11
MAX44260/MAX44261
1.8V 15MHz Low-Offset,
Low-Power, Rail-to-Rail I/O Op Amps
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.
Figure 3. CAL vs. SHDN Input Operation
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
12
MAX44260/MAX44261
1.8V 15MHz Low-Offset,
Low-Power, Rail-to-Rail I/O Op Amps
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 MAX44260/MAX44261 are ideal for a wide variety
of active filter circuits that make use of their wide band-
width, 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 buf-
fer, 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 amplifiers in por-
table applications.
Where higher resolution is required, refer to the MAX1069
(14-bit) and MAX1169 (16-bit) ADC families.
Ordering Information
+Denotes a lead(Pb)-free/RoHS-compliant package.
Chip Information
PROCESS: BiCMOS
PART TEMP RANGE PIN-
PACKAGE
TOP
MARK
MAX44260AXT+ -40NC to +125NC6 SC70 +AEB
MAX44260AYT+ -40NC to +125NC6 Thin FDFN
(Ultra-Thin LGA) +AY
MAX44261AXT+ -40NC to +125NC6 SC70 +AEC
13
MAX44260/MAX44261
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.maxim-ic.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.
6 SC70 X6SN+1 21-0077 90-0189
6 Thin FDFN
(Ultra-Thin LGA) Y61A1+1 21-0190 90-0233
14
MAX44260/MAX44261
1.8V 15MHz Low-Offset,
Low-Power, Rail-to-Rail I/O Op Amps
Package Information (continued)
For the latest package outline information and land patterns (footprints), go to www.maxim-ic.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.
15
MAX44260/MAX44261
1.8V 15MHz Low-Offset,
Low-Power, Rail-to-Rail I/O Op Amps
Package Information (continued)
For the latest package outline information and land patterns (footprints), go to www.maxim-ic.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.
MAX44260/MAX44261
1.8V 15MHz Low-Offset,
Low-Power, Rail-to-Rail I/O Op Amps
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. 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 Products, Inc. 160 Rio Robles, San Jose, CA 95134 408-601-1000 16
© 2012 Maxim Integrated Products Maxim is a registered trademark of Maxim Integrated Products, Inc.
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
