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MAX4238/MAX4239

Ultra-Low Offset/Drift, Low-Noise,

Precision SOT23 Amplifiers

19-2424; Rev 4; 1/14

For pricing, delivery, and ordering information, please contact Maxim Direct

at 1-888-629-4642, or visit Maxim’s website at www.maximintegrated.com.

General Description

The 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 current to 0.1µA.

The MAX4238 is unity-gain stable with a gain-band-

width product of 1MHz, while the decompensated

MAX4239 is stable with A

≥ 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

Features

o 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

o Low 10nV/°C Drift

o Specified over the -40°C to +125°C Automotive

Temperature Range

o Low Noise: 1.5µV

P-P

from DC to 10Hz

o 150dB A

VOL

, 140dB PSRR, 140dB CMRR

o High Gain-Bandwidth Product

1MHz (MAX4238)

6.5MHz (MAX4239)

o 0.1µA Shutdown Mode

o Rail-to-Rail Output (R

= 1kΩ)

o Low 600µA Supply Current

o Ground-Sensing Input

o Single 2.7V to 5.5V Supply Voltage Range

o Available in a Space-Saving 6-Pin SOT23 and

TDFN Packages

Ultra-Low Offset/Drift, Low-Noise,

Precision SOT23 Amplifiers

MAX4238/

MAX4239

360Ω

STRAIN GAUGE

18kΩ

AIN

= 100

ADC

Typical Application Circuit

Pin Configurations appear at end of data sheet.

Note: All devices are specified over the -40°C to +125°C oper-

ating temperature range.

Denotes a lead(Pb)-free/RoHS-compliant package.

EP = Exposed paddle.

/V denotes an automotive-qualified part.

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

Selector Guide

PART

MINIMUM STABLE

GAIN

BANDWIDTH

(MHz)

MAX4238 1V/V 1

MAX4239 10V/V 6.5

Summary of content (9 pages)

PAGE 1
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.
PAGE 2
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.
PAGE 3
MAX4238/MAX4239 Ultra-Low Offset/Drift, Low-Noise, Precision SOT23 Amplifiers ELECTRICAL CHARACTERISTICS (continued) (2.7V ≤ V CC ≤ 5.5V, V CM = V GND = 0V, V OUT = V CC /2, R L = 10kΩ connected to V CC /2, SHDN = V CC , T A = +25 ° C, unless otherwise noted.
PAGE 4
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 = 10kΩ connected to VCC/2, SHDN = VCC, TA = -40°C to +125°C, unless otherwise noted.) (Note 5) PARAMETER Input Offset Voltage Input Offset Drift Common-Mode Input Voltage Range Common-Mode Rejection Ratio Power-Supply Rejection Ratio Large-Signal Voltage Gain SYMBOL CONDITIONS VOS (Note 1) TCVOS (Note 1) VCM CMRR PSRR 10 VGND - 0.
PAGE 5
MAX4238/MAX4239 Ultra-Low Offset/Drift, Low-Noise, Precision SOT23 Amplifiers Typical Operating Characteristics (VCC = 5V, VCM = 0V, RL = 10kΩ connected to VCC/2, SHDN = VCC, TA = +25°C, unless otherwise noted.) 30 20 0 TA = -40°C 0 0.3 0.6 0.9 1.2 1.5 TA = +25°C TA = -40°C 0 -0.4 2.7 3.4 4.1 4.8 5.5 0 0.9 1.8 2.7 COMMON-MODE VOLTAGE (V) OUTPUT HIGH VOLTAGE vs. OUTPUT SOURCE CURRENT OUTPUT LOW VOLTAGE vs. OUTPUT SINK CURRENT MAX4238 GAIN AND PHASE vs. FREQUENCY 0.20 VCC = 2.7V 0.
PAGE 6
MAX4238/MAX4239 Ultra-Low Offset/Drift, Low-Noise, Precision SOT23 Amplifiers Typical Operating Characteristics (continued) (VCC = 5V, VCM = 0V, RL = 10kΩ connected to VCC/2, SHDN = VCC, TA = +25°C, unless otherwise noted.) MAX4239 GAIN AND PHASE vs. FREQUENCY VCC = 5V GAIN = 40dB RL = 10kΩ CL = 0pF 1E+2 1E+3 1E+4 1E+5 1E+6 SUPPLY CURRENT vs.
PAGE 7
MAX4238/MAX4239 Ultra-Low Offset/Drift, Low-Noise, Precision SOT23 Amplifiers Typical Operating Characteristics (continued) (VCC = 5V, VCM = 0V, RL = 10kΩ connected to VCC/2, SHDN = VCC, TA = +25°C, unless otherwise noted.) SHUTDOWN WAVEFORM MAX4238/39 toc19 EMIRR vs. FREQUENCY MAX4238/39 toc20 140 MAX4238/39 toc21 DC TO 10Hz NOISE VCC = 5V, RFIN = 16dBm 120 SHDN 2V/div EMIRR (dB) 2μV/div OUT 100 1V/div OUT 80 60 40 20 0 1s/div 10μs/div VCC = 2.5V VEE = -2.
PAGE 8
MAX4238/MAX4239 Ultra-Low Offset/Drift, Low-Noise, Precision SOT23 Amplifiers Output Overload Recovery Pin Configurations Autozeroing amplifiers typically require a substantial amount of time to recover from an output overload. This is due to the time it takes for the null amplifier to correct the main amplifier to a valid output. The MAX4238/ MAX4239 require only 3.3ms to recover from an output overload (see Electrical Characteristics and Typical Operating Characteristics).
PAGE 9
MAX4238/MAX4239 Ultra-Low Offset/Drift, Low-Noise, Precision SOT23 Amplifiers Revision History REVISION NUMBER REVISION DATE 2 5/06 — — 3 8/11 Added MAX4238 and MAX4239 automotive-qualified parts 1 4 1/14 Updated Typical Operating Characteristics 7 DESCRIPTION PAGES CHANGED Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent licenses are implied.