AMC7820

SBAS231B – MARCH 2002

www.ti.com

DESCRIPTION

The AMC7820 is a complete analog monitoring and control

circuit that includes an 8-channel, 12-bit Analog-to-Digital

Converter (ADC), three 12-bit Digital-to-Analog Converters

(DACs), nine operational amplifiers, a thermistor current source,

an internal +2.5V reference, and an SPI™ serial interface.

External reference may be applied. Typical power dissipation

is 40mW. For the ADC, the unbuffered analog input range is

0V to +5.0V, and the buffered analog common-mode input

range is 0V to +3.8V. For the DACs, the analog output range

is 0V to +2.5V or 0V to +5.0V.

The AMC7820 is ideal for multichannel applications where

low power and small size are critical. The AMC7820 is

available in a TQFP-48 package and is fully specified and

tested over the –40

°C to +85°C temperature range.

SPI is a trademark of Motorola.

FEATURES

q 100kHz SAMPLING RATE 12-BIT ADC

q 8 ANALOG INPUT CHANNELS

q THREE 12-BIT DACS

q NINE OPERATIONAL AMPLIFIERS

q THERMISTOR CURRENT SOURCE

q INTERNAL 2.5V REFERENCE

q SPI SERIAL INTERFACE

q 3V LOGIC COMPATIBLE

q SINGLE +5V SUPPLY

q LOW POWER: 40mW

q TQFP-48 PACKAGE

Copyright © 2001, Texas Instruments Incorporated

ANALOG MONITORING AND CONTROL

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

APPLICATIONS

q CW LASER AND PUMP LASER CURRENT

CONTROL IN DWDM

q TEC COOLER CURRENT CONTROL IN DWDM

q OPTICAL POWER MONITORING

q TUNABLE LASER

AM

C7820

ADC

12-Bit ADC/DAC

Current Source

up to 1mA

5 Precision OPAs

DAC2

SPI

Interface

and

Control

DAC1

DAC0

AMC7820

Reference

(2.5V)

8-Channel MUX

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of Texas Instruments

standard warranty. Production processing does not necessarily include

testing of all parameters.