AD7870LP Analog Devices, AD7870LP Datasheet

AD7870LP

Manufacturer Part Number

AD7870LP

Description

PLCC28

Manufacturer

Analog Devices

Datasheets

1.AD7870JP-REEL.pdf (20 pages)

2.AD7870LP.pdf (20 pages)

Specifications of AD7870LP

Date_code

04+

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GENERAL DESCRIPTION

The AD7870/AD7875/AD7876 is a fast, complete, 12-bit A/D

converter. It consists of a track/hold amplifier, 8 s successive-

approximation ADC, 3 V buried Zener reference and versatile

interface logic. The ADC features a self-contained internal

clock which is laser trimmed to guarantee accurate control of

conversion time. No external clock timing components are re-

quired; the on-chip clock may he overridden by an external

clock if required.

The parts offer a choice of three data output formats: a single,

parallel, 12-bit word; two 8-bit bytes or serial data. Fast bus ac-

cess times and standard control inputs ensure easy interfacing to

modern microprocessors and digital signal processors.

All parts operate from 5 V power supplies. The AD7870 and

AD7876 accept input signal ranges of 3 V and 10 V, respec-

tively, while the AD7875 accepts a unipolar 0 V to +5 V input

range. The parts can convert full power signals up to 50 kHz.

The AD7870/AD7875/AD7876 feature dc accuracy specifica-

tions such as linearity, full-scale and offset error. In addition,

the AD7870 and AD7875 are fully specified for dynamic perfor-

mance parameters including distortion and signal-to-noise ratio.

The parts are available in a 24-pin, 0.3 inch-wide, plastic or her-

metic dual-in-line package (DIP). The AD7870 and AD7875

are available in a 28-pin plastic leaded chip carrier (PLCC),

while the AD7876 is available and in a 24-pin small outline

(SOIC) package.

REV. B

Information furnished by Analog Devices is believed to be accurate and

reliable. However, no responsibility is assumed by Analog Devices for its

use, nor for any infringements of patents or other rights of third parties

which may result from its use. No license is granted by implication or

otherwise under any patent or patent rights of Analog Devices.

FEATURES

Complete Monolithic 12-Bit ADC with:

72 dB SNR at 10 kHz Input Frequency

57 ns Data Access Time

Low Power: –60 mW typ

Variety of Input Ranges:

2 s Track/Hold Amplifier

8 s A/D Converter

On-Chip Reference

Laser-Trimmed Clock

Parallel, Byte and Serial Digital Interface

(AD7870, AD7875)

0 V to +5 V for AD7875

3 V for AD7870

10 V for AD7876

Complete, 12-Bit, 100 kHz, Sampling ADCs

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 617/329-4700

Fax: 617/326-8703

PRODUCT HIGHLIGHTS

1. Complete 12-Bit ADC on a Chip.

2. Dynamic Specifications for DSP Users.

3. Fast Microprocessor Interface.

The AD7870/AD7875/AD7876 provides all the functions

necessary for analog-to-digital conversion and combines a

12-bit ADC with internal clock, track/hold amplifier and

reference on a single chip.

The AD7870 and AD7875 are fully specified and tested for

ac parameters, including signal-to-noise ratio, harmonic dis-

tortion and intermodulation distortion.

Data access times of 57 ns make the parts compatible with

modern 8- and 16-bit microprocessors and digital signal pro-

cessors. Key digital timing parameters are tested and guaran-

teed over the full operating temperature range.

AD7870/AD7875/AD7876

FUNCTIONAL BLOCK DIAGRAM

World Wide Web Site: http://www.analog.com

MOS

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