MAX4238ASA ,Ultra-Low Offset/Drift / Low-Noise / Precision SOT23 AmplifiersApplications 0.1µA Shutdown ModeThermocouples Rail-to-Rail Output (R = 1kΩ )LStrain Gauges Low 6 ..
MAX4238ASA+ ,Ultra-Low Offset/Drift, Low-Noise, Precision SOT23 AmplifiersGeneral Description Beneits and
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MAX4238ASA
Ultra-Low Offset/Drift / Low-Noise / Precision SOT23 Amplifiers
General DescriptionThe MAX4238/MAX4239 are low-noise, low-drift, ultra-
high precision amplifiers that offer near-zero DC offset
and drift through the use of patented autocorrelating
zeroing techniques. This method constantly measures
and compensates the input offset, eliminating drift over
time and temperature and the effect of 1/f noise. Both
devices feature Rail-to-Rail®outputs, operate from a
single 2.7V to 5.5V supply, and consume only 600µA.
An active-low shutdown mode decreases supply cur-
rent to 0.1µA.
The MAX4238 is unity-gain stable with a gain-band-
width product of 1MHz, while the decompensated
MAX4239 is stable with AV≥10V/V and a GBWP of
6.5MHz. The MAX4238/MAX4239 are available in 8-pin
narrow SO and 6-pin SOT23 packages.
ApplicationsThermocouples
Strain Gauges
Electronic Scales
Medical Instrumentation
Instrumentation Amplifiers
FeaturesUltra-Low, 0.1µV Offset Voltage
2.0µV (max) at +25°C
2.5µV (max) at -40°C to +85°C
3.5µV (max) at -40°C to +125°CLow 10nV/oC DriftSpecified over the -40oC to +125oC Automotive
Temperature RangeLow Noise: 1.5µVP-Pfrom DC to 10Hz150dB AVOL, 140dB PSRR, 140dB CMRRHigh Gain-Bandwidth Product
1MHz (MAX4238)
6.5MHz (MAX4239)0.1µA Shutdown ModeRail-to-Rail Output (RL= 1kΩ)Low 600µA Supply CurrentGround-Sensing InputSingle 2.7V to 5.5V Supply Voltage RangeAvailable in a Space-Saving 6-Pin SOT23 Package
MAX4238/MAX4239
Ultra-Low Offset/Drift, Low-Noise,
Precision SOT23 Amplifiers
Typical Application Circuit19-2424; Rev 1; 12/02
Pin Configurations appear at end of data sheet.Rail-to-Rail is a registered trademark of Nippon Motorola, Ltd.
Ordering Information
MAX4238/MAX4239
Ultra-Low Offset/Drift, Low-Noise,
Precision SOT23 Amplifiers
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS(2.7V ≤VCC≤5.5V, VCM= GND = 0V, VOUT= VCC/2, RL= 10kΩconnected to VCC/2, SHDN= VCC, TA
= +25°C, unless otherwise noted.)
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.
Power-Supply Voltage (VCCto GND).......................................6V
All Other Pins.................................(GND - 0.3V) to (VCC+ 0.3V)
Output Short-Circuit Duration
(OUT shorted to VCCor GND)...............................Continuous
Continuous Power Dissipation (TA= +70°C)
6-Pin Plastic SOT23 (derate 9.1mW/°C above +70°C).727mW
8-Pin Plastic SO (derate 5.88mW/°C above +70°C).....471mW
Operating Temperature Range..........................-40°C to +125°C
Junction Temperature......................................................+150°C
Storage Temperature Range..............................-65°C to +150°C
Lead Temperature (soldering, 10s).................................+300°C
MAX4238/MAX4239
Ultra-Low Offset/Drift, Low-Noise,
Precision SOT23 Amplifiers
ELECTRICAL CHARACTERISTICS (continued)(2.7V ≤VCC≤5.5V, VCM= GND = 0V, VOUT= VCC/2, RL= 10kΩconnected to VCC/2, SHDN= VCC, TA
= +25°C, unless otherwise noted.)
MAX4238/MAX4239
Ultra-Low Offset/Drift, Low-Noise,
Precision SOT23 Amplifiers
ELECTRICAL CHARACTERISTICS(2.7V ≤VCC≤5.5V, VCM= GND = 0V, VOUT= VCC/2, RL= 10kΩconnected to VCC/2, SHDN= VCC, TA
= -40°C to +125°C, unless other-wise noted.) (Note 5)
Note 1:Guaranteed by design. Thermocouple and leakage effects preclude measurement of this parameter during production
testing. Devices are screened during production testing to eliminate defective units.
Note 2:IN+ and IN- are gates to CMOS transistors with typical input bias current of 1pA. CMOS leakage is so small that it is
impractical to test and guarantee in production. Devices are screened during production testing to eliminate defective units.
Note 3:Leakage does not include leakage through feedback resistors.
Note 4:Overload recovery time is the time required for the device to recover from saturation when the output has been
driven to either rail.
Note 5:Specifications are 100% tested at TA= +25°C, unless otherwise noted. Limits over temperature are guaranteed by design.
MAX4238/MAX4239
Ultra-Low Offset/Drift, Low-Noise,
Precision SOT23 Amplifiers
Typical Operating Characteristics(VCC= 5V, VCM= 0V, RL= 10kΩconnected to VCC/2, SHDN= VCC, TA= +25°C, unless otherwise noted.)
MAX4238
GAIN AND PHASE vs. FREQUENCY (TA = -40°C)MAX4238/39 toc07
FREQUENCY (Hz)
GAIN AND PHASE (dB/DEGREES)100k10k1k
0.1k10M
OUTPUT LOW VOLTAGE
vs. OUTPUT SINK CURRENTMAX4238/39 toc05
SINK CURRENT (mA)
OUTPUT LOW VOLTAGE (V)105
OUTPUT HIGH VOLTAGE
vs. OUTPUT SOURCE CURRENT
MAX4238/39 toc04
SOURCE CURRENT (mA)
OUTPUT HIGH VOLTAGE (V)105
OFFSET VOLTAGE
vs. COMMON-MODE VOLTAGE
MAX4238/39 toc03
COMMON-MODE VOLTAGE (V)
OFFSET VOLTAGE (
OFFSET VOLTAGE vs. SUPPLY VOLTAGE
MAX4238/39 toc02
SUPPLY VOLTAGE (V)
OFFSET VOLTAGE (
INPUT OFFSET DISTRIBUTION
MAX4238/39 toc01
OFFSET VOLTAGE (µV)
PERCENTAGE OF UNITS (%)
MAX4238
GAIN AND PHASE vs. FREQUENCY (TA = +125°C)
MAX4238/39 toc08
FREQUENCY (Hz)
GAIN AND PHASE (dB/DEGREES)100k10k1k
0.1k10M
MAX4238/MAX4239
Ultra-Low Offset/Drift, Low-Noise,
Precision SOT23 Amplifiers
Typical Operating Characteristics (continued)(VCC= 5V, VCM= 0V, RL= 10kΩconnected to VCC/2, SHDN= VCC, TA= +25°C, unless otherwise noted.)
