MP3275 데이터 시트보기 (PDF) - Exar Corporation

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MP3275

Fault Protected 16 Channel, 12-Bit Data Acquisition Subsystem

Exar Corporation 

FEATURES

• Fault Protected 16-Channel 12-Bit A/D

Converter with Sample & Hold, Reference,

Clock and 3-State Outputs

• Fast Conversion, less than 15µS

• 2’s Complement and Serial Data Output

• Remote Analog Ground Sensing

• Overvoltage Protected Input (50 V over the

Supply Voltages)

MP3275

Fault Protected 16 Channel, 12-Bit

Data Acquisition Subsystem

• Precision Reference for Long Term Stability and

Low Gain T.C.

• Guaranteed Linearity Over Temperature

• Guaranteed Performance at +12/–5 V, ±12 & ±15 V

• Low Power (7 mW per Channel Typical)

• Parallel Version: MP3276

• 32 Channel Version: MP3274

GENERAL DESCRIPTION

The MP3275 is a complete 16-channel, 12-bit Data Acquisi-

tion Subsystem with serial data port. Implemented using an ad-

vanced BiCMOS process, the converter combines a 16-channel

passive overvoltage-protected multiplexer instrumentation

amp, a sample & hold, a SAR, a 12-bit decoded D/A, a compa-

rator, a precision reference and the control logic to achieve an

accurate conversion in less than 15µs, and a mux/instrumenta-

tion amp settling period of less than 10µs.

A unique input design provides input overvoltage protection

to 50 V over the supply voltages. The circuit design can allow

for an overvoltage condition on unselected channels without dis-

rupting the measured channel or operation of the MP3275! The

internal 4 V reference has sufficient output current to provide

other system reference needs. Precision thin film scaling and

offset resistors are laser trimmed to provide for less than 2 LSB

INL for +10 V inputs on all channels.

In addition, the MP3275 will output either full scale (0111 ....)

for overrange and – full scale (1000....) for underrange condi-

tions. This greatly simplifies microprocessor software develop-

ment.

SIMPLIFIED BLOCK DIAGRAM

GND REF.

VDD VCC

AB0-3

(4 pins) 4

16

AIN0-15

Ch.

(16 pins) 16 MUX

AGND2

REF OUT

4V

REF

AGND3

Rev. 4.00

DGND VEE

–

+

REF IN /2

VREF

CLK

Control

Logic

VDAC

12

SAR

12

Latch/

Shift Register

3-State

Driver

WR CS STS

DGND

RD ADEN STL

SDO

1

AGND

Comp

SDC

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