Datasheet

ManualsBrandsMaxim ManualsAmplifiers & ComparatorsOperational Amplifier Single 1 MHz SO-8

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 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 A

≥ 10V/V and a GBWP of

6.5MHz. The MAX4238/MAX4239 are available in 8-pin

narrow SO and 6-pin SOT23 packages.

Applications

Thermocouples

Strain Gauges

Electronic Scales

Medical Instrumentation

Instrumentation Amplifiers

Features

♦ 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

♦ Specified over the -40

C to +125

C Automotive

Temperature Range

♦ Low Noise: 1.5µV

P-P

from DC to 10Hz

♦ 150dB A

VOL

, 140dB PSRR, 140dB CMRR

♦ High Gain-Bandwidth Product

1MHz (MAX4238)

6.5MHz (MAX4239)

♦ 0.1µA Shutdown Mode

♦ Rail-to-Rail Output (R

= 1kΩ)

♦ Low 600µA Supply Current

♦ Ground-Sensing Input

♦ Single 2.7V to 5.5V Supply Voltage Range

♦ Available in a Space-Saving 6-Pin SOT23 Package

MAX4238/MAX4239

Ultra-Low Offset/Drift, Low-Noise,

Precision SOT23 Amplifiers

________________________________________________________________ Maxim Integrated Products 1

MAX4238/

MAX4239

360Ω

STRAIN GUAGE

18kΩ

AIN

= 100

ADC

Typical Application Circuit

19-2424; Rev 1; 12/02

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at

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

Pin Configurations appear at end of data sheet.

Rail-to-Rail is a registered trademark of Nippon Motorola, Ltd.

Ordering Information

PART TEMP RANGE

PIN-

PACKAGE

TOP

MARK

MAX4238AUT-T -40

C to +125

C 6 SOT23-6 AAZZ

MAX4238ASA -40

C to +125

C 8 SO —

MAX4239AUT-T -40

C to +125

C 6 SOT23-6 ABAA

MAX4239ASA -40

C to +125

C 8 SO —

Selector Guide

PART

MINIMUM STABLE

GAIN

BANDWIDTH

(MHz)

MAX4238 1V/V 1

MAX4239 10V/V 6.5

Summary of content (11 pages)

PAGE 1
9-2424; Rev 1; 12/02 Ultra-Low Offset/Drift, Low-Noise, Precision SOT23 Amplifiers Applications Features ♦ 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/oC Drift ♦ Specified over the -40oC to +125oC Automotive Temperature Range ♦ Low Noise: 1.5µVP-P from DC to 10Hz ♦ 150dB AVOL, 140dB PSRR, 140dB CMRR ♦ High Gain-Bandwidth Product 1MHz (MAX4238) 6.5MHz (MAX4239) ♦ 0.
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 .................................(GND - 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).....
PAGE 3
Ultra-Low Offset/Drift, Low-Noise, Precision SOT23 Amplifiers (2.7V ≤ V CC ≤ 5.5V, V CM = 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.) PARAMETER SYMBOL CONDITIONS RL = 10kΩ, CL = 100pF, phase margin = 60o Maximum Closed-Loop Gain Settling Time -1V step AV = 10 (Note 4) Overload Recovery Time Startup Time AV = 10 MIN MAX4238 1000 MAX4239 6700 0.1% (10 bit) 0.5 0.025% (12 bit) 1.0 0.006% (14 bit) 0.0015% (16 1.7 2.3 0.
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 GND 0.05 2.
PAGE 5
Ultra-Low Offset/Drift, Low-Noise, Precision SOT23 Amplifiers 30 20 TA = +25°C 0 -1.5 -1.2 -0.9 -0.6 -0.3 0 TA = +25°C TA = -40°C 0 -0.4 0.3 0.6 0.9 1.2 1.5 2.7 3.4 4.1 4.8 5.5 0.9 0 1.8 2.7 3.6 COMMON-MODE VOLTAGE (V) OUTPUT HIGH VOLTAGE vs. OUTPUT SOURCE CURRENT OUTPUT LOW VOLTAGE vs. OUTPUT SINK CURRENT MAX4238 GAIN AND PHASE vs. FREQUENCY (TA = +25°C) 0.20 VCC = 2.7V 0.15 VCC = 5V 0.10 MAX4238/39 toc05 0.25 0.35 0.
PAGE 6
Typical Operating Characteristics (continued) (VCC = 5V, VCM = 0V, RL = 10kΩ connected to VCC/2, SHDN = VCC, TA = +25°C, unless otherwise noted.) VCC = 5V AV = 1000V/V CL = 100pF RL = 10kΩ 1k 10k 100k 1M 10M SUPPLY CURRENT vs. SUPPLY VOLTAGE TA = +125°C 500 VCC = 5V AV = 1000V/V CL = 100pF RL = 10kΩ 0.
PAGE 7
Ultra-Low Offset/Drift, Low-Noise, Precision SOT23 Amplifiers SHUTDOWN WAVEFORM DC TO 10Hz NOISE MAX4238/39 toc20 MAX4238/39 toc19 SHDN 2V/div 2µV/div OUT 1V/div OUT 10µs/div 1s/div RL = 10kΩ CL = 100pF VCC = 2.5V VEE = -2.5V Pin Description PIN NAME FUNCTION SOT23 SO 1 6 OUT Amplifier Output 2 4 GND Ground 3 3 IN+ Noninverting Input 4 2 IN- Inverting Input 5 1 SHDN 6 7 VCC Positive Power Supply N.C. No Connection. Not internally connected. — 5, 8 Shutdown Input.
PAGE 8
MAX4238/MAX4239 Ultra-Low Offset/Drift, Low-Noise, Precision SOT23 Amplifiers Output Overload Recovery 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
Ultra-Low Offset/Drift, Low-Noise, Precision SOT23 Amplifiers 6LSOT.EPS _______________________________________________________________________________________ 9 MAX4238/MAX4239 Package Information (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information, go to www.maxim-ic.com/packages.
PAGE 10
Package Information (continued) (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information, go to www.maxim-ic.com/packages.) DIM A A1 B C e E H L N E H INCHES MILLIMETERS MAX MIN 0.069 0.053 0.010 0.004 0.014 0.019 0.007 0.010 0.050 BSC 0.150 0.157 0.228 0.244 0.016 0.050 MAX MIN 1.35 1.75 0.10 0.25 0.35 0.49 0.25 0.19 1.27 BSC 3.80 4.00 5.80 6.20 0.40 SOICN .
PAGE 11
This datasheet has been downloaded from: www.DatasheetCatalog.com Datasheets for electronic components.