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General Description

The MAX4460/MAX4461/MAX4462 are instrumentation

amplifiers with precision specifications, low-power con-

sumption, and excellent gain-bandwidth product.

Proprietary design techniques allow ground-sensing

capability combined with ultra-low input current and

increased common-mode rejection performance. These

rail-to-rail output instrumentation amplifiers are offered in

fixed or adjustable gains and the option for either a shut-

down mode or a pin to set the output voltage relative to

an external reference (see the Ordering Information and

Selector Guide).

The MAX4460 has an adjustable gain and uses ground

as its reference voltage. The MAX4461 is offered in fixed

gains of 1, 10, and 100, uses ground as its reference volt-

age, and has a logic-controlled shutdown input. The

MAX4462 is offered in fixed gains of 1, 10, and 100 and

has a reference input pin (REF). REF sets the output volt-

age for zero differential input to allow bipolar signals in

single-supply applications.

The MAX4460/MAX4461/MAX4462 have high-impedance

inputs optimized for small-signal differential voltages. The

MAX4461/MAX4462 are factory trimmed to gains of 1, 10,

or 100 (suffixed U, T, and H) with ±0.1% accuracy. The

typical offset of the MAX4460/MAX4461/MAX4462 is

100µV. All devices have a gain-bandwidth product of

2.5MHz.

These amplifiers operate with a single-supply voltage

from 2.85V to 5.25V and with a quiescent current of only

700µA (less than 1µA in shutdown for the MAX4461). The

MAX4462 can also be operated with dual supplies.

Smaller than most competitors, the MAX4460/

MAX4461/MAX4462 are available in space-saving 6-pin

SOT23 and TDFN packages.

________________________Applications

Industrial Process Control

Strain-Gauge Amplifiers

Transducer Interface

Precision Low-Side Current Sense

Low-Noise Microphone Preamplifier

Differential Voltage Amplification

Battery-Powered Medical Equipment

Features

♦ Tiny 6-Pin SOT23 and TDFN Packages

♦ Input Negative Rail Sensing

♦ 1pA (typ) Input Bias Current

♦ 100µV Input Offset Voltage

♦ Rail-to-Rail Output

♦ 2.85V to 5.25V Single Supply

♦ 700µA Supply Current

♦ ±0.1% Gain Error

♦ 2.5MHz Gain-Bandwidth Product

♦ 18nV/√Hz Input-Referred Noise

MAX4460/MAX4461/MAX4462

SOT23, 3V/5V, Single-Supply, Rail-to-Rail

Instrumentation Amplifiers

________________________________________________________________ Maxim Integrated Products 1

19-2279; Rev 4; 3/06

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.

Ordering Information

PART

TEMP

RANGE

PIN-

PACKAGE

TOP

MARK

MAX4460ETT+T

-40°C to +85°C 6 TDFN-EP*

+ANI

MAX4460EUT-T

-40°C to +85°C 6 SOT23-6

AASS

MAX4460ESA

-40°C to +85°C

8 SO —

MAX4461UETT+T

-40°C to +85°C 6 TDFN-EP*

+ANJ

MAX4461UEUT-T

-40°C to +85°C 6 SOT23-6

AAST

MAX4461UESA

-40°C to +85°C

8 SO —

MAX4461TETT+T

-40°C to +85°C 6 TDFN-EP*

+ANK

MAX4461TEUT-T

-40°C to +85°C 6 SOT23-6

AASU

MAX4461TESA

-40°C to +85°C

8 SO —

MAX4461HETT+T

-40°C to +85°C 6 TDFN-EP*

+ANL

MAX4461HEUT-T

-40°C to +85°C 6 SOT23-6

AASV

MAX4461HESA

-40°C to +85°C

8 SO —

Pin Configurations appear at end of data sheet.

+ ∆V

- ∆V

MAX4462

OUT

REF

Typical Application Circuits

Selector Guide appears at end of data sheet.

Typical Application Circuits continued at end of data sheet.

+Denotes lead-free package.

*EP = Exposed paddle.

Ordering Information continued at end of data sheet.

Summary of content (20 pages)

PAGE 1
9-2279; Rev 4; 3/06 SOT23, 3V/5V, Single-Supply, Rail-to-Rail Instrumentation Amplifiers The MAX4460/MAX4461/MAX4462 are instrumentation amplifiers with precision specifications, low-power consumption, and excellent gain-bandwidth product. Proprietary design techniques allow ground-sensing capability combined with ultra-low input current and increased common-mode rejection performance.
PAGE 2
MAX4460/MAX4461/MAX4462 SOT23, 3V/5V, Single-Supply, Rail-to-Rail Instrumentation Amplifiers ABSOLUTE MAXIMUM RATINGS Supply Voltage (VDD to VSS) ...................................-0.3V to +6V All Other Pins ...................................(VSS - 0.3V) to (VDD + 0.3V) Output Short-Circuit Duration to Either Supply.........................1s Continuous Power Dissipation (TA = +70°C) 6-Pin SOT23 (derate 8.7mW/°C above +70°C)............695mW 6-Pin TDFN-EP (derate 18.2mW/°C above +70°C) ....
PAGE 3
SOT23, 3V/5V, Single-Supply, Rail-to-Rail Instrumentation Amplifiers (VDD = 5V, VCM = 0V, VDIFF = VIN+ - VIN- = 50mV to 100mV for G = 1, 20mV to 100mV for G = 10, 2mV to 48mV for G =100, MAX4460 is configured for G = 10, RL = 200kΩ to GND, TA = +25°C, unless otherwise noted.) PARAMETER SYMBOL CONDITIONS MIN TYP MAX 0.1 0.3 G = 10V/V, MAX4461TESA 0.12 0.35 G = 100V/V, MAX4461HESA 0.15 0.6 G = 10V/V, MAX4460ESA 0.15 0.
PAGE 4
MAX4460/MAX4461/MAX4462 SOT23, 3V/5V, Single-Supply, Rail-to-Rail Instrumentation Amplifiers ELECTRICAL CHARACTERISTICS—MAX4460/MAX4461 (continued) (VDD = 5V, VCM = 0V, VDIFF = VIN+ - VIN- = 50mV to 100mV for G = 1, 20mV to 100mV for G = 10, 2mV to 48mV for G = 100, MAX4460 is configured for G = 10, RL = 200kΩ to GND, TA = TMIN to TMAX, unless otherwise noted.) PARAMETER Input Common-Mode Range SYMBOL VCM CONDITIONS Guaranteed by CMRR test MIN -0.1 Input Common-Mode Rejection Ratio CMRR VCM = -0.
PAGE 5
SOT23, 3V/5V, Single-Supply, Rail-to-Rail Instrumentation Amplifiers (VDD = 5V, VSS = 0V, VCM = VREF = VDD/2, RL = 100kΩ to VDD/2, TA = +25°C, unless otherwise noted. VDIFF = VIN+ - VIN- = -100mV to +100mV for G = 1 and G = 10, -20mV to +20mV for G = 100.) PARAMETER Supply Voltage SYMBOL VDD Supply Current CONDITIONS Guaranteed by PSRR test MIN TYP 2.85 MAX UNITS 5.25 V VDD = 5V, VDIFF = 0V 0.8 1.1 VDD = 3V, VDIFF = 0V 0.68 0.
PAGE 6
MAX4460/MAX4461/MAX4462 SOT23, 3V/5V, Single-Supply, Rail-to-Rail Instrumentation Amplifiers ELECTRICAL CHARACTERISTICS—MAX4462 (continued) (VDD = 5V, VSS = 0V, VCM = VREF = VDD/2, RL = 100kΩ to VDD/2, TA = +25°C, unless otherwise noted. VDIFF = VIN+ - VIN- = -100mV to +100mV for G = 1 and G = 10, -20mV to +20mV for G = 100.
PAGE 7
SOT23, 3V/5V, Single-Supply, Rail-to-Rail Instrumentation Amplifiers (V DD = 5V, V SS = 0V, V CM = V REF = V DD /2, R L = 100kΩ to V DD /2, T A = T MIN to T MAX , unless otherwise noted. V DIFF = VIN+ - VIN- = -100mV to +100mV for G = 1 and G = 10, -20mV to +20mV for G = 100.) (Note 5) PARAMETER SYMBOL CONDITIONS Nonlinearity TYP MAX VOH RL = 100kΩ 4 RL = 10kΩ 8 VOL VOL - VSS (Note 3) RL = 100kΩ 8 RL = 10kΩ 16 RL = 10kΩ, MAX4462UESA TA = 0°C to +85°C 0.8 TA = -40°C to +85°C 1.
PAGE 8
Typical Operating Characteristics (VDD = 5V, VSS = 0V, VIN+ = VIN- = VREF = VDD/2, RL = 100kΩ to VDD/2, TA = +25°C, unless otherwise noted. VDIFF = VIN+ - VIN- = -100mV to +100mV for G = 1 and G = 10, -20mV to +20mV for G = 100.) 14 6 8 6 300 200 250 100 150 0 50 -50 0 -100 0 -200 2 -150 2 -300 4 4 -4 -3 GAIN-LINEARITY HISTOGRAM 0 1 2 3 4 MAX4460 toc04 -90 -100 0.3 0.4 0.5 0 AV = 1V/V -20 -40 -60 -80 -100 -120 0 -120 -130 0.1 0.01 0.02 0.03 0.04 0.05 0.06 0.07 0.08 0.09 0.
PAGE 9
SOT23, 3V/5V, Single-Supply, Rail-to-Rail Instrumentation Amplifiers TA = +25°C TA = -40°C 10 8 6 4 MAX4462H NORMALIZED OUTPUT ERROR vs. COMMON-MODE VOLTAGE VS. OUTPUT CURRENT 0.12 0.10 0.08 0.06 0.04 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 VCM (V) OUTPUT SWING HIGH OUTPUT SWING LOW vs. OUTPUT CURRENT VDD = 3.3V 140 120 VDD = 2.85V 80 60 1 2 VCM (V) 3 4 5 6 7 8 9 VDD = 5.0V 0 1 2 3 4 5 6 7 8 OUTPUT CURRENT (mA) GAIN BANDWIDTH vs.
PAGE 10
Typical Operating Characteristics (continued) (VDD = 5V, VSS = 0V, VIN+ = VIN- = VREF = VDD/2, RL = 100kΩ to VDD/2, TA = +25°C, unless otherwise noted. VDIFF = VIN+ - VIN- = -100mV to +100mV for G = 1 and G = 10, -20mV to +20mV for G = 100.
PAGE 11
SOT23, 3V/5V, Single-Supply, Rail-to-Rail Instrumentation Amplifiers PIN NAME MAX4460 FUNCTION SOT23/TDFN SO 1 1 OUT 2 2 GND Negative Supply Voltage 3 3 IN+ Positive Differential Input — 4, 5 N.C. No Connection. Not internally connected. 4 6 IN- Negative Differential Input 5 7 VDD Positive Supply Voltage 6 8 FB Feedback Input. Connect FB to the center tap of a resistive divider from OUT to GND to set the gain. EP — EP Exposed Pad. TDFN only. Connect to GND.
PAGE 12
MAX4460/MAX4461/MAX4462 SOT23, 3V/5V, Single-Supply, Rail-to-Rail Instrumentation Amplifiers Functional Diagrams VDD VDD VDD MAX4462 MAX4461 MAX4460 OUT OUT OUT SHDN FB gM gM gM gM gM gM REF VSS Figure 1. Functional Diagrams Detailed Description The MAX4460/MAX4461/MAX4462 family of instrumentation amplifiers implements Maxim’s proprietary indirect current-feedback design to achieve a precision specification and excellent gain-bandwidth product.
PAGE 13
SOT23, 3V/5V, Single-Supply, Rail-to-Rail Instrumentation Amplifiers MAX4460/MAX4461/MAX4462 have an input commonmode range of 100mV below the negative supply to 1.7V below the positive supply. The output reference voltage of MAX4462U/T/H is set by REF and ranges from 100mV above the negative supply to 1.7V below the positive supply. For maximum voltage swing in a bipolar operation, connect REF to VDD/2. The output voltages of the MAX4460 and MAX4461U/ T/H are referenced to ground.
PAGE 14
MAX4460/MAX4461/MAX4462 SOT23, 3V/5V, Single-Supply, Rail-to-Rail Instrumentation Amplifiers VOUT END-POINT LINE IDEAL TRANSFER FUNCTION (LINE) VOUT B VOUT2 Z IDEAL LINE ACTUAL CURVE VIN1 0 VIN2 E VIN VIN 0 VOUT1 A Figure 3. Transfer Function of an Ideal Instrumentation Amplifier (Straight Line Passing Through the Origin) Looking at this curve, one can immediately identify three types of errors.
PAGE 15
SOT23, 3V/5V, Single-Supply, Rail-to-Rail Instrumentation Amplifiers Generally, NL+ and NL- have different values and this remains the case if the device is calibrated (trimmed) for end-points errors (which means changing the gain of the instrumentation amplifier in such a way that the slope of line AB becomes equal to that of CD, and the offset becomes trimmed such that OE vanishes to zero). This is an undesirable situation when nonlinearity is of prime interest.
PAGE 16
MAX4460/MAX4461/MAX4462 SOT23, 3V/5V, Single-Supply, Rail-to-Rail Instrumentation Amplifiers Applications Information Setting the Gain (MAX4460) The MAX4460 gain is set by connecting a resistivedivider from OUT to GND, with the center tap connected to FB (Figure 2). The gain is calculated by: Gain = 1 + R2 / R1 Because FB has less than 100pA IB, high-valued resistors can be used without significantly affecting the gain accuracy. The sum of resistors (R1 + R2) near 100kΩ is a good compromise.
PAGE 17
SOT23, 3V/5V, Single-Supply, Rail-to-Rail Instrumentation Amplifiers 4.7µF MAX4462TEUT 2.2kΩ 3 5 1 OUT+ 100kΩ 4 2 20kΩ 6 20kΩ 6 3 MIC 4 MAX4335 1 VREF 2 0.1µF OUT- Figure 7.
PAGE 18
SOT23, 3V/5V, Single-Supply, Rail-to-Rail Instrumentation Amplifiers MAX4460/MAX4461/MAX4462 Pin Configurations TOP VIEW OUT 1 GND 2 6 MAX4460 IN+ 3 5 4 FB VDD IN- OUT 1 8 FB GND 2 7 VDD 3 6 IN- N.C. 4 5 N.C. MAX4460 IN+ + OUT 1 GND 2 IN+ 3 MAX4460 *EP 6 FB 5 VDD 4 IN- 6 SHDN 5 VDD 4 IN- 6 REF 5 VDD 4 IN- SO SOT23 TDFN OUT 1 GND 2 6 MAX4461 IN+ 3 5 4 SHDN VDD IN- OUT 1 8 SHDN GND 2 7 VDD 3 6 IN- N.C. 4 5 N.C.
PAGE 19
SOT23, 3V/5V, Single-Supply, Rail-to-Rail Instrumentation Amplifiers 6, 8, &10L, DFN THIN.EPS D2 D A2 PIN 1 ID N 0.35x0.35 b PIN 1 INDEX AREA E [(N/2)-1] x e REF. E2 DETAIL A e k A1 CL CL A L L e e PACKAGE OUTLINE, 6,8,10 & 14L, TDFN, EXPOSED PAD, 3x3x0.80 mm -DRAWING NOT TO SCALE- 21-0137 G 1 2 COMMON DIMENSIONS MIN. MAX. D 0.70 2.90 0.80 3.10 E A1 2.90 0.00 3.10 0.05 L k 0.20 0.40 0.25 MIN. A2 0.20 REF. SYMBOL A PACKAGE VARIATIONS PKG.
PAGE 20
Package Information (continued) 6LSOT.EPS (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.) PACKAGE OUTLINE, SOT 6L BODY 21-0058 DIM A A1 B C e E H L N E H INCHES MILLIMETERS MAX MIN 0.053 0.069 0.004 0.010 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 1.75 1.35 0.25 0.10 0.49 0.35 0.19 0.25 1.27 BSC 3.80 4.00 5.80 6.20 0.40 G 1 1 SOICN .