TLH10554

November 1994

ADC1241 Self-Calibrating 12-Bit Plus

Sign mP-Compatible AD Converter

with Sample-and-Hold

General Description

The ADC1241 is a CMOS 12-bit plus sign successive ap-

proximation analog-to-digital converter

On request

the

ADC1241 goes through a self-calibration cycle that adjusts

LSB

also has the ability to go through an Auto-Zero cycle that

corrects the zero error during every conversion

The analog input to the ADC1241 is tracked and held by the

internal circuitry and therefore does not require an external

sample-and-hold A unipolar analog input voltage range (0V

The 13-bit word on the outputs of the ADC1241 gives a 2’s

complement representation of negative numbers The digi-

tal inputs and outputs are compatible with TTL or CMOS

logic levels

Applications

Y

Digital Signal Processing

Y

High Resolution Process Control

Y

Instrumentation

Key Specifications

Y

Resolution

12 Bits plus Sign

Y

Conversion Time

138ms (max)

Y

Linearity Error

g

Y

Zero Error

g

1LSB (max)

Y

Positive Full Scale Error

g

1LSB (max)

Y

Power Consumption

70mW (max)

Features

Y

Self-calibrating

Y

Internal sample-and-hold

Y

a

5V reference

Y

No missing codes over temperature

Y

TTLMOS inputoutput compatible

Y

Standard 28-pin DIP

TRI-STATE

is a registered trademark of National Semiconductor Corporation

Simplified Schematic

TLH10554 – 1

Connection Diagram

Dual-In-Line Package

TLH10554 – 2

Top View

Order Number ADC1241CMJ

ADC1241CMJ883 ADC1241BIJ or

ADC1241CIJ

See NS Package Number J28A

C1995 National Semiconductor Corporation

RRD-B30M115Printed in U S A