max9939aub Maxim Integrated Products, Inc., max9939aub Datasheet

max9939aub

Manufacturer Part Number

max9939aub

Description

Spi Programmable-gain Amplifier With Input Vos Trim And Output Op Amp

Manufacturer

Maxim Integrated Products, Inc.

Datasheet

1.MAX9939AUB.pdf (14 pages)

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The MAX9939 is a general-purpose, differential-input

programmable-gain amplifier (PGA) that is ideal for con-

ditioning a variety of wide dynamic range signals such

as those found in motor current-sense, medical instru-

mentation, and sonar data acquisition applications. It

features SPI™-programmable differential gains from

0.2V/V to 157V/V, input offset-voltage compensation, and

an output amplifier that can be configured either as a

high-order active filter or to provide a differential output.

The PGA is optimized for high-signal bandwidth and its

gain can be programmed to be 0.2V/V, 1V/V, 10V/V,

20V/V, 30V/V, 40V/V, 60V/V, 80V/V, 119V/V, and 157V/V.

Precision resistor matching provides extremely low gain

tempco and high CMRR. Although the MAX9939 oper-

ates from a single supply V

can process signals both above and below ground due

to the use of an input level-shifting amplifier stage.

Furthermore, its inputs are protected to ±16V, allowing it

to withstand fault conditions and signal overranges.

The output amplifier is designed for high bandwidth

and low-bias currents, making it ideal for use in multi-

ple-feedback active filter topologies that offer much

higher Qs and stopband attenuation than Sallen-Key

architectures.

The MAX9939 draws 3.4mA of quiescent supply current

at 5V, and includes a software-programmable shut-

down mode that reduces its supply current to only

13µA. The MAX9939 is available in a 10-pin µMAX

package and operates over the -40°C to +125°C auto-

motive temperature range.

19-4329; Rev 0; 11/08

SPI is a trademark of Motorola, Inc.

µMAX is a registered trademark of Maxim Integrated Products, Inc.

Functional Diagram appears at end of data sheet.

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.

Sensorless Motor Control

Medical Signal Conditioning

Sonar and General Purpose Data Acquisition

Differential to Single-Ended Conversion

Differential-Input, Differential-Output Signal

Amplification

Sensor Interface and Signal Processing

________________________________________________________________ Maxim Integrated Products

with Input Vos Trim and Output Op Amp

General Description

between 2.9V to 5.5V, it

SPI Programmable-Gain Amplifier

Applications

♦ SPI-Programmable Gains: 0.2V/V to 157V/V

♦ Extremely Low Gain Tempco

♦ Integrated Amplifier for R/C Programmable Active

♦ Input Offset-Voltage Compensation

♦ Input Protection to ±16V

♦ 13µA Software Shutdown Mode

♦ -40°C to +125°C Operating Temperature Range

♦ 10-Pin µMAX Package

+ Denotes a lead-free/RoHS-compliant package.

MAX9939AUB+

Filter

TOP VIEW

PART

SCLK

INA+

GND

INA-

DIN

-40°C to +125°C

TEMP RANGE

Ordering Information

MAX9939

µMAX

Pin Configuration

OUTA

INB

OUTB

PIN-PACKAGE

Features

10 µMAX

Related parts for max9939aub

max9939aub Summary of contents

Page 1

... Integrated Amplifier for R/C Programmable Active Filter ♦ Input Offset-Voltage Compensation ♦ Input Protection to ±16V ♦ 13µA Software Shutdown Mode ♦ -40°C to +125°C Operating Temperature Range ♦ 10-Pin µMAX Package PART MAX9939AUB+ + Denotes a lead-free/RoHS-compliant package. ® Applications TOP VIEW Features Ordering Information TEMP RANGE PIN-PACKAGE -40° ...

Page 2

SPI Programmable-Gain Amplifier with Input Vos Trim and Output Op Amp ABSOLUTE MAXIMUM RATINGS V to GND ..............................................................-0.3V to +6V CC INB, OUTA, OUTB, SCLK, DIN, CS............-0. INA+, INA- to GND ..................................................-16V to +16V Output Short-Circuit Current Duration........................Continuous ...

Page 3

Input Vos Trim and Output Op Amp ELECTRICAL CHARACTERISTICS (continued 5V Gain = 10V/ GND INA+ INA- Typical values are +25°C.) (Note 1) A PARAMETER ...

Page 4

SPI Programmable-Gain Amplifier with Input Vos Trim and Output Op Amp CS t CSS t CSO SCLK DIN Figure 1. SPI Interface Timing Diagram ( Gain = 10V/ ...

Page 5

Input Vos Trim and Output Op Amp ( Gain = 10V/ GND IN+ IN- INPUT V vs. TEMPERATURE OS 3.0 2.5 2.0 1.5 1.0 0.5 0 -40 ...

Page 6

SPI Programmable-Gain Amplifier with Input Vos Trim and Output Op Amp ( Gain = 10V/ GND IN+ IN- OUTPUT IMPEDANCE vs. FREQUENCY 100 AMPLIFIER 0.1 ...

Page 7

Input Vos Trim and Output Op Amp ( Gain = 10V/ GND IN+ IN- COMMON-MODE REJECTION RESPONSE 200μs/div PIN NAME 1 SCLK Serial-Clock ...

Page 8

SPI Programmable-Gain Amplifier with Input Vos Trim and Output Op Amp CS SCLK DIN Figure 2. SPI Interface Timing Diagram (CPOL = CPHA = 0) CMRR, gain accuracy, and very low temperature drift due to precise resistor matching. The output ...

Page 9

Input Vos Trim and Output Op Amp SHDN: Set SHDN to 0 for normal operation. Set SHDN place the device in a low-power 13µA shutdown mode. In shutdown mode, the outputs OUTA and OUTB are high ...

Page 10

SPI Programmable-Gain Amplifier with Input Vos Trim and Output Op Amp Table 4. Input Offset-Voltage Trim INPUT OFFSET VOLTAGE ( TRIMS POSITIVE TRIMS NEGATIVE) V3:V0 0000 0001 0010 0011 0100 0101 0110 0111 1000 1001 ...

Page 11

Input Vos Trim and Output Op Amp MAX9939 10kΩ INA+ LVL 10kΩ INA- 10kΩ INPUT OFFSET- GAIN SHUTDOWN VOLTAGE TRIM SPI REGISTERS SCLK DIN CS Figure 3. Using the MAX9939 Output Amplifier as an Anti-Aliasing Filter (Corner Frequency = ...

Page 12

SPI Programmable-Gain Amplifier with Input Vos Trim and Output Op Amp MAX9939 10kΩ INA+ LVL 10kΩ INA- 10kΩ INPUT OFFSET- GAIN SHUTDOWN VOLTAGE TRIM SPI REGISTERS SCLK DIN CS Figure 4. Using the MAX9939 as a Differential-Input, Differential-Output PGA 12 ...

Page 13

SPI Programmable-Gain Amplifier with Input Vos Trim and Output Op Amp MAX9939 10kΩ INA+ LVL 10kΩ INA- 10kΩ INPUT OFFSET- GAIN SHUTDOWN VOLTAGE TRIM SPI REGISTERS SCLK DIN CS ______________________________________________________________________________________ Functional Diagram 20kΩ 20kΩ ...

Page 14

... Maxim reserves the right to change the circuitry and specifications without notice at any time. 14 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2008 Maxim Integrated Products Package Information PACKAGE CODE U10+2 α α registered trademark of Maxim Integrated Products, Inc. DOCUMENT NO. 21-0061 ...

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