Document
MAX4238/MAX4239
Ultra-Low Offset/Drift, Low-Noise, Precision SOT23 Amplifiers
General Description
The MAX4238/MAX4239 are low-noise, low-drift, ultrahigh 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 activelow shutdown mode decreases supply current to 0.1µA.
The MAX4238 is unity-gain stable with a gain-bandwidth 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, 6-pin TDFN and SOT23 packages.
Applications
●● Thermocouples ●● Strain Gauges ●● Electronic Scales ●● Medical Instrumentation ●● Instrumentation Amplifiers
Typical Application Circuit
5V
360Ω STRAIN GAUGE
18kΩ AV = 100
ADC AIN
18kΩ MAX4238/ MAX4239
Benefits and Features
●● DC Performance Ideal for High-Precision Sensor Interface • Ultra-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°C • Low 10nV/°C Drift • Low Noise: 1.5µVP-P from DC to 10Hz • 150dB AVOL, 140dB PSRR, 140dB CMRR • High Gain-Bandwidth Product • 1MHz (MAX4238) • 6.5MHz (MAX4239) • Ground-Sensing Input • Rail-to-Rail Output (RL = 1kΩ)
●● Low Power Consumption Reduces System Power • Single 2.7V to 5.5V Supply Voltage Range • 600µA Supply Current • 0.1µA Shutdown Mode
Pin Configurations appear at end of data sheet.
Ordering Information
PART
PIN-PACKAGE
TOP MARK
MAX4238AUT-T
6 SOT23
AAZZ
MAX4238AUT/V+T
6 SOT23
—
MAX4238ASA
8 SO
—
MAX4238ATT+T
6 TDFN-EP*
+ANG
MAX4239AUT-T
6 SOT23
ABAA
MAX4239AUT/V+T
6 SOT23
—
MAX4239ASA
8 SO
—
MAX4239ATT+T
6 TDFN-EP*
+ANH
Note: All devices are specified over the -40°C to +125°C operating temperature range.
+Denotes a lead(Pb)-free/RoHS-compliant package.
*EP = Exposed paddle.
/V denotes an automotive-qualified part.
Selector Guide
PART
MINIMUM STABLE GAIN
GAIN BANDWIDTH
(MHz)
MAX4238 MAX4239
1V/V 10V/V
1 6.5
19-2424; Rev 6; 9/15
MAX4238/MAX4239
Ultra-Low Offset/Drift, Low-Noise, Precision SOT23 Amplifiers
Absolute Maximum Ratings
Power-Supply Voltage (VCC to GND)......................................6V All Other Pins.............................(VGND - 0.3V) to (VCC + 0.3V) Output Short-Circuit Duration
(OUT shorted to VCC or 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 6-Pin TDFN-EP (derate 18.2mW above +70°C)........1454mW
Operating Temperature Range.......................... -40°C to +125°C Junction Temperature......................................