MAX4239 Maxim, MAX4239 Datasheet

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MAX4239

Manufacturer Part Number
MAX4239
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 autocorrelating zeroing techniques
Manufacturer
Maxim
Datasheet

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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
6.5MHz. The MAX4238/MAX4239 are available in 8-pin
narrow SO, 6-pin TDFN and SOT23 packages.
19-2424; Rev 3; 8/11
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.
Thermocouples
Strain Gauges
Electronic Scales
Medical Instrumentation
Instrumentation Amplifiers
STRAIN GAUGE
360Ω
Typical Application Circuit
5V
________________________________________________________________ Maxim Integrated Products
General Description
18kΩ
V
≥ 10V/V and a GBWP of
A
V
18kΩ
= 100
MAX4238/
MAX4239
Ultra-Low Offset/Drift, Low-Noise,
Applications
AIN
ADC
Precision SOT23 Amplifiers
o Ultra-Low, 0.1µV Offset Voltage
o Low 10nV/°C Drift
o Specified over the -40°C to +125°C Automotive
o Low Noise: 1.5µV
o 150dB A
o High Gain-Bandwidth Product
o 0.1µA Shutdown Mode
o Rail-to-Rail Output (R
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
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.
Pin Configurations appear at end of data sheet.
MAX4238
MAX4239
MAX4238AUT-T
MAX4238AUT/V+T
MAX4238ASA
MAX4238ATT+T
MAX4239AUT-T
MAX4239AUT/V+T
MAX4239ASA
MAX4239ATT+T
Temperature Range
TDFN Packages
2.0µV (max) at +25°C
2.5µV (max) at -40°C to +85°C
3.5µV (max) at -40°C to +125°C
1MHz (MAX4238)
6.5MHz (MAX4239)
PART
PART
VOL
, 140dB PSRR, 140dB CMRR
MINIMUM STABLE
P-P
Ordering Information
PIN-PACKAGE
6 SOT23
6 SOT23
8 SO
6 TDFN-EP*
6 SOT23
6 SOT23
8 SO
6 TDFN-EP*
from DC to 10Hz
10V/V
L
GAIN
1V/V
= 1kΩ)
Selector Guide
BANDWIDTH
Features
TOP MARK
(MHz)
GAIN
6.5
+ANG
ABAA
+ANH
AAZZ
1
1

Related parts for MAX4239

MAX4239 Summary of contents

Page 1

... The MAX4238 is unity-gain stable with a gain-band- width product of 1MHz, while the decompensated ≥ 10V/V and a GBWP of MAX4239 is stable with A V 6.5MHz. The MAX4238/MAX4239 are available in 8-pin narrow SO, 6-pin TDFN and SOT23 packages. Applications Thermocouples Strain Gauges Electronic Scales ...

Page 2

... OUT CC MAX4238 100pF step MAX4239 OUT MAX4238 R = 10k , C = 100pF measured 100kHz MAX4239 MAX4238 R = 10k , C = 100pF phase margin = 60° MAX4239 /2, SHDN = MIN TYP MAX 0 1 GND CC - 0.1 - 1.3 120 140 120 140 = 10k 125 ...

Page 3

... Ultra-Low Offset/Drift, Low-Noise, Precision SOT23 Amplifiers = 0V / 10kΩ connected to V OUT CC L CONDITIONS MAX4238 R = 10k , C = 100pF phase margin = 60° MAX4239 0.1% (10 bit) 0.025% (12 bit) -1V step 0.006% (14 bit) 0.0015% (16 bit) 0.1% (10 bit) 0.025% (12 bit (Note 4) 0.006% (14 bit) 0.0015% (16 bit) 0.1% (10 bit) 0.025% (12 bit) A ...

Page 4

Ultra-Low Offset/Drift, Low-Noise, Precision SOT23 Amplifiers ELECTRICAL CHARACTERISTICS (2.7V ≤ V ≤ 5.5V GND = 0V OUT wise noted.) (Note 5) PARAMETER SYMBOL Input Offset Voltage V Input Offset Drift TCV Common-Mode Input Voltage V ...

Page 5

0V 10kΩ connected INPUT OFFSET DISTRIBUTION -1.5 -1.2 -0.9 -0.6 -0.3 0 0.3 0.6 0.9 1.2 1.5 OFFSET VOLTAGE (µV) OUTPUT HIGH ...

Page 6

... FREQUENCY (Hz) COMMON-MODE REJECTION RATIO vs. FREQUENCY 0 -20 -40 -60 -80 -100 -120 -140 -160 0.01 0 100 FREQUENCY (kHz) MAX4239 SMALL-SIGNAL TRANSIENT RESPONSE MAX4238/39 toc17 IN 50mV/div OUT 50mV/div 10µs/div A = 10V 2kΩ 100pF L SUPPLY CURRENT vs. SUPPLY VOLTAGE 600 T = +125°C A 500 T = -40°C ...

Page 7

... This noise appears as a constantly changing voltage in series with any signal being measured. The MAX4238/MAX4239 treat 1/f noise as a slow varying offset error, inherently canceling the 1/f noise. SHUTDOWN WAVEFORM MAX4238/39 toc20 ...

Page 8

... 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 ). The MAX4238/MAX4239 feature a low-power (0.1µA) shutdown mode ...

Page 9

... Added MAX4238 and MAX4239 automotive-qualified parts 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 ...

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