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MP3276

Fault Protected 16 Channel, 12-Bit Data Acquisition Subsystem

Exar Corporation 

MP3276

Fault Protected 16 Channel, 12-Bit

Data Acquisition Subsystem

FEATURES

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

Converter with Sample & Hold, Reference,

Clock and 3-state Outputs

• Fast Conversion, less than 15µS

• Microprocessor Bus Interface

• 2’s Complement Data Output

• Parallel or Serial Data Output Modes

• 65 ns Bus Access Time

• Remote Analog Ground Sensing

• Overvoltage Protected Input (50 V over the Sup-

ply Voltages)

• 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: 110 mW typ. (7 mW per Channel typ.)

• 32 Channel Version: MP3274

GENERAL DESCRIPTION

The MP3276 is a complete 16-channel, 12-bit Data Acquisi-

tion Subsystem with 3-state output buffers for direct interfacing

to 16-bit microprocessor buses. 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 comparator, a

precision reference and the control logic to achieve an accurate

repeated 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 MP3276! 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 MP3276 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

GND REF.

VDD VCC

AB0-3

(4 pins) 4 16 Ch.

AIN0-15

MUX

(16 pins)

16

AGND2

REF IN

–

+

REF IN /2

VREF

4V

REF OUT

REF

CLK

AGND3

Control

Logic

VDAC

12

SAR

12

Latch/

Shift Register

3-state

Drivers

Rev. 4.00

DGND VEE AGND WR RD ADEN STL

CS

STS

1

DB0-DB11

AGND

Comp

PXS

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