Datasheet

ManualsBrandsMAXIM INTEGRATED ManualsLinear ICsLinear IC - Op-amp Multi-purpose uMAX 8

General Description

The MAX4236/MAX4237 are high-precision op amps

that feature an exceptionally low offset voltage and off-

set voltage temperature coefficient without using any

chopper techniques. The MAX4236 and MAX4237 have

a typical large-signal, open-loop voltage gain of 120dB.

These devices have an ultra-low input-bias current of

1pA. The MAX4236 is unity-gain stable with a gain-

bandwidth product of 1.7MHz, while the MAX4237 is

stable for closed-loop gains greater than 5V/V with a

gain-bandwidth product of 7.5MHz. Both devices have

a shutdown function in which the quiescent current is

reduced to less than 0.1µA, and the amplifier output is

forced into a high-impedance state.

The input common-mode range of the MAX4236/

MAX4237 extends below the negative supply range, and

the output swings Rail-to-Rail

. These features make the

amplifiers ideal for applications with +3V or +5V single

power supplies. The MAX4236/MAX4237 are specified for

the extended temperature range (-40°C to +85°C) and

are available in tiny SOT23, µMAX, and SO packages. For

greater accuracy, the A grade µMAX and SO packages

are tested to guarantee 20µV (max) offset voltage at

+25°C and less then 2µV/°C drift.

Applications

Strain Gauges

Piezoelectric Sensors

Thermocouple Amplifiers

Electrochemical Sensors

Battery-Powered Instrumentation

Instrumentation Amplifiers

Features

♦ Ultra-Low Offset Voltage

20µV (max) at +25°C (Grade A)

50µV (max) at +25°C (Grade B, 6-Pin SOT23)

♦ Ultra-Low Offset Voltage Drift

2µV/°C (max) (Grade A)

4.5µV/°C (max) (Grade B, 6-Pin SOT23)

5.5µV/°C (max) (6-Pin SOT23)

♦ Ultra-Low 1pA Input Bias Current

♦ High Open-Loop Voltage Gain: 110dB (min)

= 100kΩ)

♦ Compatible with +3V and +5V Single-Supply

Power Systems

♦ Ground Sensing: Input Common-Mode Range

Includes Negative Rail

♦ Rail-to-Rail Output Swing into a 1kΩ Load

♦ 350µA Quiescent Current

♦ Gain-Bandwidth Product

1.7MHz (MAX4236, A

= 1V/V)

7.5MHz (MAX4237, A

= 5V/V)

♦ 200pF Capacitive Load Handling Capability

♦ Shutdown Mode: 0.1µA Quiescent Current,

Places Output in a High-Impedance State

♦ Available in Space-Saving SOT23 and µMAX

Packages

MAX4236/MAX4237

SOT23, Very High Precision, 3V/5V

Rail-to-Rail Op Amps

________________________________________________________________ Maxim Integrated Products 1

TOP VIEW

IN-IN+

16V

5 SHDN

OUT

MAX4236

MAX4237

SOT23-6

OUT

N.C.V

IN+

IN-

N.C.

MAX4236A/B

MAX4237A/B

SO-8/µMAX

SHDN

Pin Configurations

Ordering Information

19-2110; Rev 0; 8/01

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.

PART TEMP. RANGE PIN-PACKAGE

MAX4236EUT-T -40°C to +85°C 6 SOT23-6

MAX4236AEUA -40°C to +85°C 8 µMAX

MAX4236BEUA -40°C to +85°C 8 µMAX

MAX4236AESA -40°C to +85°C 8 SO

MAX4236BESA -40°C to +85°C 8 SO

MAX4237EUT-T -40°C to +85°C 6 SOT23-6

MAX4237AEUA -40°C to +85°C 8 µMAX

MAX4237BEUA -40°C to +85°C 8 µMAX

MAX4237AESA -40°C to +85°C 8 SO

MAX4237BESA -40°C to +85°C 8 SO

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

Summary of content (14 pages)

PAGE 1
9-2110; Rev 0; 8/01 SOT23, Very High Precision, 3V/5V Rail-to-Rail Op Amps The MAX4236/MAX4237 are high-precision op amps that feature an exceptionally low offset voltage and offset voltage temperature coefficient without using any chopper techniques. The MAX4236 and MAX4237 have a typical large-signal, open-loop voltage gain of 120dB. These devices have an ultra-low input-bias current of 1pA. The MAX4236 is unity-gain stable with a gainbandwidth product of 1.
PAGE 2
MAX4236/MAX4237 SOT23, Very High Precision, 3V/5V Rail-To-Rail Op Amps ABSOLUTE MAXIMUM RATINGS Supply Voltage (VCC - VEE) ......................................-0.3V to +6V Analog Input Voltage (IN+ or IN-) ....(VEE - 0.3V) to (VCC + 0.3V) Logic Input Voltage (SHDN) ............(VEE - 0.3V) to (VCC + 0.3V) Current into Any Pin ............................................................20mA Output Short-Circuit Duration....
PAGE 3
SOT23, Very High Precision, 3V/5V Rail-To-Rail Op Amps (VCC = +2.4V to +5.5V, VEE = 0, VCM = 0, VOUT = VCC/2, RL = 100kΩ to VCC/2, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC = +5V and TA = +25°C.) (Note 1) PARAMETER SYMBOL CONDITIONS VCC = +5V, RL connected to VCC/2, TA = +25oC VCC = +5V, RL connected to VCC/2, TA = TMIN to TMAX Large-Signal Voltage Gain MIN TYP RL = 100kΩ, VOUT = 15mV to (VCC - 50mV) 110 128 RL = 1kΩ, VOUT = 0.15V to (VCC - 0.
PAGE 4
MAX4236/MAX4237 SOT23, Very High Precision, 3V/5V Rail-To-Rail Op Amps ELECTRICAL CHARACTERISTICS (SO-8 and µMAX-8) (continued) (VCC = +2.4V to +5.5V, VEE = 0, VCM = 0, VOUT = VCC/2, RL = 100kΩ to VCC/2, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC = +5V and TA = +25°C.) (Note 1) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Input Capacitance CIN f = 100kHz 7.5 Input Voltage Noise Density en f = 1kHz 14 nV/√Hz f = 0.1Hz to 10Hz 0.
PAGE 5
SOT23, Very High Precision, 3V/5V Rail-To-Rail Op Amps (VCC = +2.4V to +5.5V, VEE = 0, VCM = 0, VOUT = VCC/2, RL = 100kΩ to VCC/2, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC = +5V and TA = +25°C.) (Note 1) PARAMETER Power-Supply Rejection Ratio SYMBOL PSRR CONDITIONS VCC = +2.4V to +5.
PAGE 6
ELECTRICAL CHARACTERISTICS (SOT23-6) (continued) (VCC = +2.4V to +5.5V, VEE = 0, VCM = 0, VOUT = VCC/2, RL = 100kΩ to VCC/2, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC = +5V and TA = +25°C.) (Note 1) PARAMETER SYMBOL Settling Time CONDITIONS tS VOUT settling to within 0.
PAGE 7
SOT23, Very High Precision, 3V/5V Rail-To-Rail Op Amps MAX4236/MAX4237 Typical Operating Characteristics (continued) (VCC = +5V, VEE = 0, VCM = VCC/2, RL = 100kΩ to VCC/2, TA = +25°C, unless otherwise noted.) COMMON-MODE REJECTION RATIO vs. COMMON-MODE INPUT VOLTAGE 60 40 20 0 80 60 40 20 1.0 1.5 2.0 2.5 3.0 1 2 3 4 40 20 0.01 5 COMMON-MODE INPUT VOLTAGE (V) COMMON-MODE REJECTION RATIO vs. FREQUENCY (VCC = 3V) POWER-SUPPLY REJECTION RATIO vs.
PAGE 8
Typical Operating Characteristics (continued) (VCC = +5V, VEE = 0, VCM = VCC/2, RL = 100kΩ to VCC/2, TA = +25°C, unless otherwise noted.) 360 +V = 5V 340 330 TA = -40°C VCC = 5V, RL to VEE TA = +25°C 335 VCC = 5V, RL to VCC 120 TA = +85°C 330 TA = +125°C 100 VCC = 3V, RL to VEE 325 VCC = 3V, RL to VCC 80 +V = 3V 320 RL = 1kΩ 140 GAIN (dB) 370 350 340 SUPPLY CURRENT (µA) SUPPLY CURRENT (µA) 380 MAX4236 toc14 MAX4236 toc13 390 LARGE-SIGNAL GAIN vs. TEMPERATURE SUPPLY CURRENT vs.
PAGE 9
SOT23, Very High Precision, 3V/5V Rail-To-Rail Op Amps OUTPUT SINK CURRENT vs. OUTPUT VOLTAGE 60 50 40 30 20 50 40 30 20 10 20 MAX4236 toc24 VCC = 3V OUTPUT TO GND SHORT-CIRCUIT CURRENT (mA) 15 VCC = 5V 10 VCC = 3V 5 SHORTED TO VEE (SOURCING CURRENT) 10 0 0 1.0 1.5 2.0 2.5 3.0 -25 0 25 50 75 TEMPERATURE (°C) SHORT-CIRCUIT CURRENT vs. TEMPERATURE DC I/O TRANSFER CURVE (RLOAD = 100kΩ) DC I/O TRANSFER CURVE (RLOAD = 1kΩ) 2.
PAGE 10
MAX4236/MAX4237 SOT23, Very High Precision, 3V/5V Rail-To-Rail Op Amps Typical Operating Characteristics (continued) (VCC = +5V, VEE = 0, VCM = VCC/2, RL = 100kΩ to VCC/2, TA = +25°C, unless otherwise noted.) MAX4237 NONINVERTING LARGE-SIGNAL RESPONSE MAX4237 NONINVERTING LARGE-SIGNAL RESPONSE MAX4236 toc30 MAX4236 toc31 INPUT 200mV/div 0 0 OUTPUT 1V/div INPUT 200mV/div 0 0 2µs/div OUTPUT 1V/div 1µs/div VCC = ±2.5V RL = 100kΩ, CL = 15pF AV = 5V/V VCC = ±2.
PAGE 11
SOT23, Very High Precision, 3V/5V Rail-To-Rail Op Amps NAME PIN SOT23 SO/µMAX 1 6 FUNCTION OUT Amplifier Output Negative Power Supply. Bypass with a 0.1µF capacitor to ground. Connect to GND for single-supply operation. 2 4 VEE 3 3 IN+ Noninverting Amplifier Input 4 2 IN- Inverting Amplifier Input 5 8 SHDN Shutdown Input. Do not leave floating. Connect to VCC for normal operation or GND to enter the shutdown mode. 6 7 VCC Positive Supply Input. Bypass with a 0.
PAGE 12
MAX4236/MAX4237 SOT23, Very High Precision, 3V/5V Rail-To-Rail Op Amps Selector Guide current, low-noise inputs allow a minimum of capacitance to be used. Piezoresistive transducers applications require many of the same qualities. For those applications the MAX4236/MAX4237 high CMRR, PSRR, and offset stability are also a good match. A typical application for a piezoresistive transducer instrumentation amplifier design using the MAX4236/MAX4237 is shown in the Typical Application Circuit.
PAGE 13
SOT23, Very High Precision, 3V/5V Rail-To-Rail Op Amps 6LSOT.EPS 8LUMAXD.
PAGE 14
SOT23, Very High Precision, 3V/5V Rail-To-Rail Op Amps SOICN.EPS MAX4236/MAX4237 Package Information (continued) 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.