Maxim MAX44280 1.8v, 50mhz, low-offset, low-power, rail-to-rail i/o op amp Datasheet

19-6157; Rev 1; 4/12
EVALUATION KIT AVAILABLE
MAX44280
1.8V, 50MHz, Low-Offset,
Low-Power, Rail-to-Rail I/O Op Amp
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 processing 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 maximum 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 temperature 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
S
S
S
1.7V Supply Rail Over the 0°C to +70°C Range
50MHz Bandwidth
Low 12.7nV/√Hz Input Voltage-Noise Density
Low 1.2fA/√Hz Input Current-Noise Density
Low 50µV (max) VOS at +25°C
500fA Low Input Bias Current
750µA Quiescent Current per Amplifier
< 1µA Supply Current in Shutdown
Small, 2mm x 2mm SC70 and 1mm x 1.5mm Thin
µDFN Packages
S Low 110dB Total Harmonic Distortion
S
S
S
S
S
S 5V/V Minimum Stable Gain
Applications
Notebooks
3G/4G Handsets
Portable Media Players
Portable Medical Instruments
Battery-Operated Devices
Ordering Information appears at end of data sheet.
Analog-to-Digital Converter Buffers
Transimpedance Amplifiers
General-Purpose Signal Processing
Typical Application Circuit
+3.3V
MAX44280
VSIG
10kI
2.4kI
3.3nF
ADC
MAX11645
24kI
For related parts and recommended products to use with this part, refer to: www.maxim-ic.com/MAX44280.related
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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.
MAX44280
1.8V, 50MHz, Low-Offset,
Low-Power, Rail-to-Rail I/O Op Amp
ABSOLUTE MAXIMUM RATINGS
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
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.
PACKAGE THERMAL CHARACTERISTICS (Note 1)
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
Note 1: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a fourlayer board. For detailed information on package thermal considerations, refer to www.maxim-ic.com/thermal-tutorial.
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
VDD
+ 0.1
V
DC CHARACTERISTICS
Input Voltage Range
VIN+ VIN-
Guaranteed by CMRR test
-0.1
10
TA = +25NC
Input Offset Voltage
VOS
100
TA = -40°C to +125°C after calibration
VOS - TC
TA = +25NC
Input Bias Current
Input Capacitance
Common-Mode Rejection Ratio
Open-Loop Gain
IB
AOL
Output Short-Circuit Current
ISC
0.8
5
0.01
0.5
TA = -40NC to +85NC
10
TA = -40NC to +125NC
100
CIN
CMRR
FV
500
TA = -40°C to +125°C
Input Offset Voltage Drift
50
FV/NC
pA
0.4
pF
VCM = -0.1V to (VDD + 0.1V)
75
90
dB
0.4V P VOUT P VDD - 0.4V, ROUT = 10kI
100
115
0.4V P VOUT P VDD - 0.4V, ROUT = 600I
91
100
0.4V P VOUT P VDD - 0.4V, ROUT = 32I
80
To VDD or VSS
85
dB
mA
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MAX44280
1.8V, 50MHz, Low-Offset,
Low-Power, Rail-to-Rail I/O Op Amp
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
VOL VSS
Output Voltage Swing
VDD VOH
CONDITIONS
MIN
TYP
MAX
UNITS
20
ROUT = 10kI
50
ROUT = 600I
400
ROUT = 32I
700
10
ROUT = 10kI
mV
40
ROUT = 600I
ROUT = 32I
400
800
AC CHARACTERISTICS
Input Voltage-Noise Density
en
f = 10kHz
12.7
nV/√Hz
Input Current-Noise Density
in
f = 10kHz
1.2
fA/√Hz
GBWP
50
MHz
AMIN
5
V/V
Gain-Bandwidth Product
Minimum Stable Gain
Slew Rate
SR
Settling Time
Capacitive Load
CLOAD
Total Harmonic Distortion
THD
30
V/Fs
VOUT = 2VP-P, VDD = 3.3V, AV = 5V/V,
CL = 30pF (load), settle to 0.01%
0.6
µs
No sustained oscillation, 5V/V
80
No sustained oscillation, 10V/V
500
f = 10kHz, VO = 2VP-P, AV = 5V/V,
ROUT = 10kI
-110
dB
1
µs
DVOUT = 0.2V, VDD = 3.3V, AV = 5V/V;
RS = 20Ω, CL = 1nF (load)
Output Transient Recovery Time
pF
POWER-SUPPLY CHARACTERISTICS
Power-Supply Range
Power-Supply Rejection Ratio
Quiescent Current
VDD
PSRR
Guaranteed by PSRR
1.8
5.5
TA = 0NC to +70NC
1.7
5.5
VCM = VDD/2
82
1200
µA
1
µA
Shutdown Input Low
VIL
0.7
V
Shutdown Input High
VIH
Output Leakage Current in
Shutdown
ISHDN
750
dB
ISHDN
Shutdown Supply Current
IDD
95
V
1.3
V
100
pA
Shutdown Input Bias Current
IIL/IIH
Shutdown Turn-On Time
tSHDN
15
µs
tON
10
ms
Turn-On Time
1
µA
Note 2: All devices are 100% production tested at TA = +25NC. Temperature limits are guaranteed by design.
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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. SUPPLY VOLTAGE
20
TA = -40°C
0
-20
TA = +25°C
0
0.5
1.0
1.5
2.0
2.5
20
TA = +25°C
0
-20
-40
TA = +125°C
-60
MAX44280 toc03
15
10
5
-100
3.5
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
0
5.5
-15 -10
-5
0
5
10
15
20
SUPPLY VOLTAGE (V)
INPUT OFFSET VOLTAGE (µV)
INPUT OFFSET DRIFT HISTOGRAM
INPUT BIAS CURRENT
vs. COMMON-MODE VOLTAGE
OUTPUT VOLTAGE LOW
vs. OUTPUT SINK CURRENT
(VOL - VEE, VCC = 1.8V)
12
10
8
6
4
80
60
40
TA = +25°C
20
0
-20
TA = -40°C
-40
-60
2
-80
0
-100
-1.5 -1 -0.5
0
0.50 1.00
-1.8 -1.3 -0.8 -0.3 0.25 0.75 1.25
INPUT OFFSET DRIFT (µV/°C)
TA = +85°C
TA = +125°C
200
25
MAX44280 toc06
14
100
180
OUTPUT VOLTAGE LOW (mV)
MAX44280 toc04
16
-2
20
COMMON-MODE VOLTAGE (V)
18
PERCENT OCCURRENCE (%)
3.0
INPUT BIAS CURRENT (pA)
-0.5
40
25
-80
TA = +125°C
-60
TA = -40°C
60
MAX44280 toc05
-40
80
MAX44280 toc02
40
INPUT VOS HISTOGRAM
100
INPUT OFFSET VOLTAGE (µV)
MAX44280 toc01
INPUT OFFSET VOLTAGE (µV)
60
PERCENT OCCURRENCE (%)
INPUT OFFSET VOLTAGE
vs. COMMON-MODE VOLTAGE
160
140
120
TA = +25°C
100
80
TA = +125°C
60
TA = -40°C
40
20
0
-0.5
0
0.5
1.0
1.5
2.0
2.5
COMMON-MODE VOLTAGE (V)
3.0
3.5
0.1
1
10
OUTPUT SINK CURRENT (mA)
100
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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 = 5V)
TA = +25°C
120
100
80
TA = +125°C
60
40
20
1
10
OUTPUT SINK CURRENT (mA)
140
TA = +25°C
120
100
80
TA = +125°C
60
40
20
TA = -40°C
0
0.1
140
TA = +25°C
120
100
80
TA = +125°C
60
TA = -40°C
40
20
1
10
OUTPUT SINK CURRENT (mA)
1
10
OUTPUT SOURCE CURRENT (mA)
80
100
TA = +125°C
60
TA = -40°C
40
0.1
180
160
140
SUPPLY CURRENT vs. SUPPLY VOLTAGE
TA = +25°C
120
100
80
TA = +125°C
60
TA = -40°C
40
0.1
1
10
OUTPUT SOURCE CURRENT (mA)
100
1
10
OUTPUT SOURCE CURRENT (mA)
900
MAX44280 toc11
200
850
TA = +25°C
800
TA = +125°C
750
700
TA = -40°C
650
0
0.1
100
100
20
0
TA = +25°C
120
0
0.1
OUTPUT VOLTAGE HIGH (mV)
160
140
OUTPUT VOLTAGE HIGH
vs. OUTPUT SOURCE CURRENT
(VCC - VOH, VCC = 5V)
MAX44280 toc10
OUTPUT VOLTAGE HIGH (mV)
180
160
20
TA = -40°C
OUTPUT VOLTAGE HIGH
vs. OUTPUT SOURCE CURRENT
(VCC - VOH, VCC = 3.3V)
200
180
0
100
MAX44280 toc09
160
200
MAX44280 toc12
140
180
SUPPLY CURRENT (µA)
160
200
MAX44280 toc08
OUTPUT VOLTAGE LOW (mV)
180
OUTPUT VOLTAGE LOW (mV)
MAX44280 toc07
200
OUTPUT VOLTAGE HIGH
vs. OUTPUT SOURCE CURRENT
(VCC - VOH, VCC = 1.8V)
OUTPUT VOLTAGE HIGH (mV)
OUTPUT VOLTAGE LOW
vs. OUTPUT SINK CURRENT
(VOL - VEE, VCC = 3.3V)
100
600
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
SUPPLY VOLTAGE (V)
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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)
0.6
0.5
TA = -40°C
0.4
TA = +25°C
0.3
0.2
100
-40
80
60
-100
2.0
2.5
3.0
3.5
4.0
4.5
5.0
-120
0.01
5.5
0.1
1
10
100
1k
10k
100k
0
1
10
100
1k
10k
FREQUENCY (kHz)
FREQUENCY (kHz)
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
DC CMRR AND PSRR
vs. TEMPERATURE
INPUT VOLTAGE-NOISE DENSITY
vs. FREQUENCY
-40
-60
-80
DC CMRR
-94
-96
-98
-100
DC PSRR
-100
-120
0.1
1
10
100
FREQUENCY (kHz)
1k
10k
100k
100k
MAX44280 toc18
-92
REJECTION RATIO (dB)
-20
500
INPUT-VOLTAGE NOISE DENSITY (nV/√Hz)
-90
MAX44280 toc16
0
0.01
0.01
SUPPLY VOLTAGE (V)
MAX44280 toc17
1.5
-60
-80
40
0
0
PSRR (dB)
-20
20
0.1
MAX44280 toc15
120
CMRR (dB)
0.7
0
MAX44280 toc14
TA = +125°C
OPEN-LOOP GAIN (dB)
0.9
0.8
140
MAX44280 toc13
SHUTDOWN SUPPLY CURRENT (µA)
1.0
COMMON-MODE REJECTION RATIO
vs. FREQUENCY
OPEN-LOOP GAIN vs. FREQUENCY
450
400
350
300
250
200
150
100
50
0
-50
-25
0
25
50
75
TEMPERATURE (°C)
100
125
0.01
0.1
1
10
100
1k
10k
FREQUENCY (kHz)
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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.)
INPUT CURRENT-NOISE DENSITY
vs. FREQUENCY
MAX44280 toc19
4.5
4.0
2.5
2.0
MAX44280 toc22
-90
-95
-100
-105
1.5
-110
1.0
-115
0.5
TOTAL HARMONIC DISTORTION vs. FREQUENCY
(VOUT = 2VP-P)
-85
-90
THD (dB)
3.0
-120
10
-80
-85
3.5
0
4s/div
-80
MAX44280 toc20
INPUT-CURRENT NOISE DENSITY (fA/√Hz)
5.0
0.5µV/div
TOTAL HARMONIC DISTORTION (dB)
TOTAL HARMONIC DISTORTION vs. INPUT AMPLITUDE
(f = 10kHz, VCC = 5.5V, AV = 5V/V)
MAX44280 toc21
0.1Hz TO 10Hz OUTPUT-VOLTAGE NOISE
100
1000
10k
0
100k
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
FREQUENCY (Hz)
OUTPUT AMPLITUDE (V)
SMALL-SIGNAL TRANSIENT RESPONSE
(AV = 5V/V, RF = 4kI, RG = 1kI)
LARGE-SIGNAL TRANSIENT RESPONSE
(AV = 5V/V, RF = 4kI, RG = 1kI)
MAX44280 toc23
INPUT
20mV/div
VCC /2
MAX44280 toc24
INPUT
100mV/div
-95
-100
VCC = 3.3V
-105
VCC = 5.5V
-115
OUTPUT
500mV/div
OUTPUT
50mV/div
VCC /2
-110
-120
1
10
100
1k
10k
100k
1G
100ns/div
100ns/div
FREQUENCY (Hz)
����������������������������������������������������������������� 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.)
STABILITY vs. CAPACITIVE LOAD AND
ISOLATION RESISTANCE
(RLOAD IN SERIES CLOAD)
OVERSHOOT (%)
10
8
6
4
50
STABLE
40
GAIN = 10V/V
20
100
1k
10k
100k
GAIN = 10V/V
10,000
1000
100
UNSTABLE
STABLE
1
0
500 1000 1500 2000 2500 3000 3500 4000
100
CAPACITIVE LOAD (pF)
RESISTANCE (I)
1000
10,000
CAPACITIVE LOAD (pF)
POWER-UP TIME
TURN-ON TIME FROM SHUTDOWN
MAX44280 toc28
MAX44280 toc29
VCC
2V/div
SHDN
2V/div
GND
VSS
OUTPUT
500mV/div
UNSTABLE
10
UNSTABLE
0
0
STABLE
GAIN = 5V/V
STABLE
10
2
GAIN = 5V/V
UNSTABLE
30
100,000
MAX44280 toc27
MAX44280 toc26
12
60
ISOLATION RESISTANCE (Ω)
MAX44280 toc25
14
STABILITY vs.
CAPACITIVE AND RESISTIVE LOAD
(RLOAD || CLOAD)
RESISTIVE LOAD (Ω)
PERCENT OVERSHOOT vs.
RESISTIVE LOAD (VIN = 100mVP-P)
OUTPUT
500mV/div
VSS
GND
4ms/div
10µs/div
����������������������������������������������������������������� Maxim Integrated Products 8
MAX44280
1.8V, 50MHz, Low-Offset,
Low-Power, Rail-to-Rail I/O Op Amp
Pin Configurations
TOP VIEW
VDD
SHDN
OUT
6
5
4
+
IN+
1
VSS
IN-
MAX44280
6
VDD
2
5
SHDN
3
4
OUT
SC70
MAX44280
1
2
3
IN+
VSS
IN-
+
THIN µDFN
(Ultra-Thin LGA)
Pin Description
PIN
NAME
1
IN+
Positive Input
FUNCTION
2
VSS
Negative Power Supply. Bypass with a 0.1FF capacitor to ground.
3
IN-
Negative Input
4
OUT
5
SHDN
6
VDD
Output
Active-Low Shutdown
Positive Power Supply. Bypass with a 0.1FF capacitor to ground.
����������������������������������������������������������������� Maxim Integrated Products 9
MAX44280
1.8V, 50MHz, Low-Offset,
Low-Power, Rail-to-Rail I/O Op Amp
Detailed Description
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 distortion common in traditional CMOS input architecture
(Figure 2), especially when used in a noninverting
configuration, such as for Sallen-Key filters.
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 temperature 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.
The charge pump’s operating frequency lies well above
the unity-gain frequency of the amplifier. Thanks to its highfrequency operation and ultra-quiet circuitry, the charge
pump generates little noise, does not require external
components, and is entirely transparent to the user.
INTERNAL
CHARGE
PUMP
MAX44280 INPUTS STRUCTURE
STANDARD INPUT STRUCTURE
Figure 1. Comparing the Input Structure of the MAX44280 to Standard Op-Amp Inputs
AMPLIFIER OUTPUT
CROSSOVER
DISTORTION
MAX44280
TIME
Figure 2. Crossover Distortion of Typical Amplifiers
���������������������������������������������������������������� Maxim Integrated Products 10
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 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 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 voltages. Low-input bias current is useful when interfacing
with high-ohmic sensors. It is also beneficial for designing transimpedance amplifiers for photodiode sensors.
This makes the device ideal for ground-referenced medical 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 driving 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 sampling rate, but just 6FA at 1ksps and 0.5FA in shutdown.
Offered in the ultra-tiny, 1.9mm x 2.2mm WLP and FMAX8 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 11
MAX44280
1.8V, 50MHz, Low-Offset,
Low-Power, Rail-to-Rail I/O Op Amp
Chip Information
Ordering Information
PROCESS: BiCMOS
TEMP RANGE PIN-PACKAGE
TOP
MARK
MAX44280AXT+
-40NC to +125NC 6 SC70
+AED
MAX44280AYT+
-40NC to +125NC
PART
6 Thin FDFN
(Ultra-Thin LGA)
+AZ
+Denotes a lead(Pb)-free/RoHS-compliant package.
���������������������������������������������������������������� Maxim Integrated Products 12
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 13
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 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
Revision History
REVISION
NUMBER
REVISION
DATE
0
12/11
Initial release
1
4/12
Updated Package Thermal Characteristics, Electrical Characteristics, and Ordering
Information.
DESCRIPTION
PAGES
CHANGED
—
2, 3, 12
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
©
2012 Maxim Integrated Products
16
Maxim is a registered trademark of Maxim Integrated Products, Inc.