MAX44280
1.8V, 50MHz, Low-Offset,
Low-Power, Rail-to-Rail I/O Op Amp
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General Description
The MAX44280 offers a unique combination of high
speed, precision, low noise, and low-voltage operation
making it ideally suited for a large number of signal pro-
cessing functions such as filtering and amplification of
signals in portable and industrial equipment.
The amplifier features an input offset of less than 50FV
and a high-gain bandwidth product of 50MHz while
maintaining a low 1.8V supply rail. The device is internally
compensated for gains of 5V/V or greater. The device’s
rail-to-rail input/outputs and low noise guarantee maxi-
mum dynamic range in demanding applications such
as 12- to 16-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 MAX44280 includes a fast-power-on shutdown mode
for further power savings.
The MAX44280 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 MAX44280 is available in a small,
6-pin SC70 package and 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
S 1.7V Supply Rail Over the 0°C to +70°C Range
S 50MHz 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 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 Packages
S Low -110dB Total Harmonic Distortion
S 5V/V Minimum Stable Gain
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
19-6157; Rev 1; 4/12
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/MAX44280.related
EVALUATION KIT AVAILABLE
MAX44280
+3.3V
3.3nF
10kIADC
MAX11645
VSIG
24kI
2.4kI
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.
����������������������������������������������������������������� Maxim Integrated Products 2
MAX44280
1.8V, 50MHz, Low-Offset,
Low-Power, Rail-to-Rail I/O Op Amp
IN+, IN-, OUT .................................(VSS - 0.3V) to (VDD + 0.3V)
VDD to VSS ...............................................................-0.3V to +6V
SHDN .......................................................................-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
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
Junction-to-Case Thermal Resistance (BJC) ............ 120NC/W
PACKAGE THERMAL CHARACTERISTICS (Note 1)
ELECTRICAL CHARACTERISTICS
(VDD = 3.3V, VSS = 0V, VIN+ = VIN- = VDD/2, RL = 10kI to VDD/2, 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 = +25NC10 50
FV
TA = -40°C to +125°C after calibration 100
TA = -40°C to +125°C500
Input Offset Voltage Drift VOS - TC 0.8 5 FV/NC
Input Bias Current IB
TA = +25NC0.01 0.5
pA
TA = -40NC to +85NC10
TA = -40NC to +125NC100
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
dB
0.4V 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 85 mA
����������������������������������������������������������������� Maxim Integrated Products 3
MAX44280
1.8V, 50MHz, Low-Offset,
Low-Power, Rail-to-Rail I/O Op Amp
Note 2: 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, 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 50 MHz
Minimum Stable Gain AMIN 5 V/V
Slew Rate SR 30 V/Fs
Settling Time VOUT = 2VP-P, VDD = 3.3V, AV = 5V/V,
CL = 30pF (load), settle to 0.01% 0.6 µs
Capacitive Load CLOAD
No sustained oscillation, 5V/V 80 pF
No sustained oscillation, 10V/V 500
Total Harmonic Distortion THD f = 10kHz, VO = 2VP-P, AV = 5V/V,
ROUT = 10kI-110 dB
Output Transient Recovery Time DVOUT = 0.2V, VDD = 3.3V, AV = 5V/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 +70NC1.7 5.5
Power-Supply Rejection Ratio PSRR VCM = VDD/2 82 95 dB
Quiescent Current IDD 750 1200 µA
Shutdown Supply Current ISHDN 1 µA
Shutdown Input Low VIL 0.7 V
Shutdown Input High VIH 1.3 V
Output Leakage Current in
Shutdown ISHDN 100 pA
Shutdown Input Bias Current IIL/IIH 1 µA
Shutdown Turn-On Time tSHDN 15 µs
Turn-On Time tON 10 ms
����������������������������������������������������������������� Maxim Integrated Products 4
MAX44280
1.8V, 50MHz, Low-Offset,
Low-Power, Rail-to-Rail I/O Op Amp
Typical Operating Characteristics
(VDD = 3.3V, VSS = 0V, VIN+ = VIN- = VDD/2, RL = 10kI to VDD/2, 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
MAX44280 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
MAX44280 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
MAX44280 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
MAX44280 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
MAX44280 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)
MAX44280 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
����������������������������������������������������������������� Maxim Integrated Products 5
MAX44280
1.8V, 50MHz, Low-Offset,
Low-Power, Rail-to-Rail I/O Op Amp
Typical Operating Characteristics (continued)
(VDD = 3.3V, VSS = 0V, VIN+ = VIN- = VDD/2, RL = 10kI to VDD/2, 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)
MAX44280 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)
MAX44280 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)
MAX44280 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)
MAX44280 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)
MAX44280 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
MAX44280 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
����������������������������������������������������������������� Maxim Integrated Products 6
MAX44280
1.8V, 50MHz, Low-Offset,
Low-Power, Rail-to-Rail I/O Op Amp
Typical Operating Characteristics (continued)
(VDD = 3.3V, VSS = 0V, VIN+ = VIN- = VDD/2, RL = 10kI to VDD/2, 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)
MAX44280 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
MAX44280 toc16
FREQUENCY (kHz)
PSRR (dB)
10k1k1001010.1
-100
-80
-60
-40
-20
0
-120
0.01 100k
OPEN-LOOP GAIN vs. FREQUENCY
MAX44280 toc14
FREQUENCY (kHz)
OPEN-LOOP GAIN (dB)
10k1k1001010.1
20
40
60
80
100
120
140
0
0.01 100k
DC CMRR AND PSRR
vs. TEMPERATURE
MAX44280 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
MAX44280 toc15
FREQUENCY (kHz)
CMRR (dB)
-100
-80
-60
-40
-20
0
-120
10k1k10010100.01 100k
INPUT VOLTAGE-NOISE DENSITY
vs. FREQUENCY
MAX44280 toc18
FREQUENCY (kHz)
INPUT-VOLTAGE NOISE DENSITY (nV/√Hz)
1k1001010.1
50
100
150
200
250
300
350
400
450
500
0
0.01 10k
����������������������������������������������������������������� Maxim Integrated Products 7
MAX44280
1.8V, 50MHz, Low-Offset,
Low-Power, Rail-to-Rail I/O Op Amp
Typical Operating Characteristics (continued)
(VDD = 3.3V, VSS = 0V, VIN+ = VIN- = VDD/2, RL = 10kI to VDD/2, 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
MAX44280 toc19
0.5µV/div
4s/div
TOTAL HARMONIC DISTORTION vs. FREQUENCY
(VOUT = 2VP-P)
MAX44280 toc22
FREQUENCY (Hz)
TOTAL HARMONIC DISTORTION (dB)
100k10k10 100 1k
-115
-110
-105
-100
-95
-90
-85
-80
-120
11
G
VCC = 5.5V
VCC = 3.3V
INPUT CURRENT-NOISE DENSITY
vs. FREQUENCY
MAX44280 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
(AV = 5V/V, RF = 4kI, RG = 1kI)
MAX44280 toc23
INPUT
20mV/div
VCC/2
OUTPUT
50mV/div
VCC/2
100ns/div
TOTAL HARMONIC DISTORTION vs. INPUT AMPLITUDE
(f = 10kHz, VCC = 5.5V, AV = 5V/V)
MAX44280 toc21
OUTPUT AMPLITUDE (V)
THD (dB)
4.54.00.5 1.0 1.5 2.5 3.02.0 3.5
-115
-110
-105
-100
-95
-90
-85
-80
-120
0 5.0
LARGE-SIGNAL TRANSIENT RESPONSE
(AV = 5V/V, RF = 4kI, RG = 1kI)
MAX44280 toc24
INPUT
100mV/div
OUTPUT
500mV/div
100ns/div
����������������������������������������������������������������� Maxim Integrated Products 8
MAX44280
1.8V, 50MHz, Low-Offset,
Low-Power, Rail-to-Rail I/O Op Amp
Typical Operating Characteristics (continued)
(VDD = 3.3V, VSS = 0V, VIN+ = VIN- = VDD/2, RL = 10kI to VDD/2, 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.
RESISTIVE LOAD (VIN = 100mVP-P)
MAX44280 toc25
RESISTANCE (I)
OVERSHOOT (%)
10k1k
2
4
6
8
10
12
14
0
100 100k
POWER-UP TIME
MAX44280 toc28
VCC
2V/div
OUTPUT
500mV/div
GND
GND
4ms/div
TURN-ON TIME FROM SHUTDOWN
MAX44280 toc29
OUTPUT
500mV/div
VSS
VSS
10µs/div
SHDN
2V/div
STABILITY vs. CAPACITIVE LOAD AND
ISOLATION RESISTANCE
(RLOAD IN SERIES CLOAD)
MAX44280 toc26
CAPACITIVE LOAD (pF)
ISOLATION RESISTANCE (Ω)
350030002500200015001000500
10
20
30
40
50
60
0
0 4000
UNSTABLE
STABLE
STABLE
UNSTABLE
GAIN = 10V/V
GAIN = 5V/V
STABILITY vs.
CAPACITIVE AND RESISTIVE LOAD
(RLOAD || CLOAD)
MAX44280 toc27
CAPACITIVE LOAD (pF)
RESISTIVE LOAD (Ω)
1000
10
100
1000
10,000
100,000
1
100 10,000
UNSTABLE
STABLE
STABLE
UNSTABLE
GAIN = 10V/V
GAIN = 5V/V
����������������������������������������������������������������� Maxim Integrated Products 9
MAX44280
1.8V, 50MHz, Low-Offset,
Low-Power, Rail-to-Rail I/O Op Amp
Pin Description
Pin Configurations
PIN NAME FUNCTION
1 IN+ Positive Input
2 VSS Negative Power Supply. Bypass with a 0.1FF capacitor to ground.
3 IN- Negative Input
4 OUT Output
5SHDN Active-Low Shutdown
6 VDD Positive Power Supply. Bypass with a 0.1FF capacitor to ground.
TOP VIEW
SC70
VSS 2
IN+ 1
IN- 3
SHDN
5
VDD
6
OUT
4
MAX44280
+
123
654
VDD OUTSHDN
IN+
+
IN-VSS
THIN µDFN
(Ultra-Thin LGA)
MAX44280
���������������������������������������������������������������� Maxim Integrated Products 10
MAX44280
1.8V, 50MHz, Low-Offset,
Low-Power, Rail-to-Rail I/O Op Amp
Detailed Description
The MAX44280 is a high-speed low-power op amp ideal
for signal processing applications due to the device’s
high precision and low-noise CMOS inputs. The device
self-calibrates on power-up to eliminate effects of tem-
perature and power-supply variation.
The MAX44280 also features a low-power shutdown
mode that greatly reduces quiescent current while the
device is not operational and recovers in 30µs.
Crossover Distortion
This op amp features 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 MAX44280 to Standard Op-Amp Inputs
Figure 2. Crossover Distortion of Typical Amplifiers
STANDARD INPUT STRUCTURE MAX44280 INPUTS STRUCTURE
INTERNAL
CHARGE
PUMP
CROSSOVER
DISTORTION
MAX44280
TIME
AMPLIFIER OUTPUT
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MAX44280
1.8V, 50MHz, Low-Offset,
Low-Power, Rail-to-Rail I/O Op Amp
Applications Information
Power-Up Autotrim
The IC features an automatic trim that self-calibrates
the VOS of this device 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.
Shutdown Operation
The MAX44280 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. The device also
recovers from shutdown in under 30Fs.
The shutdown logic levels of the device is independent
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 IC extends 100mV above
VDD and below VSS. The wide input common-mode
voltage range allows the op amp to be used as a buf-
fer 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 appli-
cations. The high output current and capacitance drive
capability of the device make it ideal as an ADC driver
and a line driver.
Input Bias Current
The IC features 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 the device ideal for ground-referenced medi-
cal and industrial sensor applications.
Active Filters
The MAX44280 is ideal for a wide variety of active filter
circuits that makes use of the wide bandwidth, rail-to-rail
input/output stages and high-impedance CMOS inputs.
Driver for Interfacing with
the MAX11645 ADC
The IC’s tiny size and low noise make it a good fit for driv-
ing 12- to 16-bit resolution ADCs in space-constrained
applications. The Typical Application Circuit shows the
MAX44280 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 sam-
pling rate, but just 6FA at 1ksps and 0.5FA in shutdown.
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 MAX44280 amplifier in portable applications.
Where higher resolution is required, refer to the MAX1069
(14-bit) and MAX1169 (16-bit) ADC families.
���������������������������������������������������������������� Maxim Integrated Products 12
MAX44280
1.8V, 50MHz, Low-Offset,
Low-Power, Rail-to-Rail I/O Op Amp
Ordering Information
+Denotes a lead(Pb)-free/RoHS-compliant package.
Chip Information
PROCESS: BiCMOS
PART TEMP RANGE PIN-PACKAGE TOP
MARK
MAX44280AXT+ -40NC to +125NC 6 SC70 +AED
MAX44280AYT+ -40NC to +125NC6 Thin FDFN
(Ultra-Thin LGA) +AZ
���������������������������������������������������������������� Maxim Integrated Products 13
MAX44280
1.8V, 50MHz, Low-Offset,
Low-Power, Rail-to-Rail I/O Op Amp
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
���������������������������������������������������������������� Maxim Integrated Products 14
MAX44280
1.8V, 50MHz, Low-Offset,
Low-Power, Rail-to-Rail I/O Op Amp
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.
���������������������������������������������������������������� Maxim Integrated Products 15
MAX44280
1.8V, 50MHz, Low-Offset,
Low-Power, Rail-to-Rail I/O Op Amp
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.
MAX44280
1.8V, 50MHz, Low-Offset,
Low-Power, Rail-to-Rail I/O Op Amp
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, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 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 12/11 Initial release —
1 4/12 Updated Package Thermal Characteristics, Electrical Characteristics, and Ordering
Information.2, 3, 12
