TLH11025

December 1994

ADC12451 Dynamically-Tested Self-Calibrating

12-Bit Plus Sign AD Converter with Sample-and-Hold

General Description

The ADC12451 is a CMOS 12-bit plus sign successive ap-

proximation analog-to-digital converter whose dynamic

specifications (SN THD etc) are tested and guaranteed

On request the ADC12451 goes through a self-calibration

cycle that adjusts linearity zero and full-scale errors The

ADC12451 also has the ability to go through an Auto-Zero

cycle that corrects the zero error during every conversion

The analog input to the ADC12451 is tracked and held by

the internal circuitry so an external sample-and-hold is not

required The ADC12451 has a S H control input which di-

rectly controls the track-and-hold state of the AD A unipo-

plies

The 13-bit data result is available on the eight outputs of the

ADC12451 in two bytes high-byte first and sign extended

The digital inputs and outputs are compatible with TTL or

CMOS logic levels

Applications

Y

Digital Signal Processing

Y

Audio

Y

Telecommunications

Y

High Resolution Process Control

Y

Instrumentation

Features

Y

Self-calibration provides excellent temperature stability

Y

Internal sample-and-hold

Y

8-bit mPDSP interface

Y

Key Specifications

Y

Resolution

12 bits plus sign

Y

Conversion Time

77 ms (max)

Y

Sampling Rate

83 kHz (max)

Y

Bipolar SignalNoise

735 dB (min)

Y

Total Harmonic Distortion

b

780 dB (max)

Y

Aperture Time

100 ns

Y

Aperture Jitter

Y

Zero Error

g

2 LSB (max)

Y

Positive Full-Scale Error

g

15 LSB (max)

Y

Power Consumption

g

5V

113 mW (max)

Simplified Block Diagram

TLH11025 – 1

Connection Diagram

Dual-In-Line Package

TLH11025 – 2

Top View

Ordering Information

Industrial

Package

ADC12451CIJ

J24A

Military

Package

ADC12451CMJ

J24A

ADC12451CMJ883

TRI-STATE

is a registered trademark of National Semiconductor Corporation

C1995 National Semiconductor Corporation

RRD-B30M115Printed in U S A