ADC

DAC

DAC

DAC

DAC

TEMP

SENSOR

MUX

GPIO Control

2.5-V Reference

AMC7891

12 GPIOs

AMC7891

www.ti.com

SBAS518A

– AUGUST 2011 – REVISED DECEMBER 2011

Analog Monitor and Control Circuit

with 10-Bit, Multi-Channel ADC and Four DACs, Temperature

Sensor, and 12 GPIOs

Check for Samples: AMC7891

1

FEATURES

APPLICATIONS

23

•

10-Bit, 500-kSPS SAR ADC:

•

Cellular Base Stations

– 8 External Analog Inputs

•

RF Communication Systems

– VREF, 2 × VREF Input Ranges

•

Optical Networks

•

Four 10-Bit Monotonic DACs:

•

General-Purpose Monitor and Control

– 0 to 5-V Output Range

DESCRIPTION

– Up to 10-mA Sink and Source Capability

The AMC7891 is a highly-integrated, low-power,

– Power-On Reset to 0 V

complete analog monitoring and control system in a

•

Internal 2.5-V Reference

very small package.

•

Internal Temperature Sensor:

For monitoring functions, the AMC7891 has 8

– –40°C to +125°C Operation

uncommitted inputs multiplexed into a 10-bit SAR

analog-to-digital converter (ADC) and an accurate

– Accuracy of ±2.5°C

on-chip temperature sensor. Control signals are

•

12 General-Purpose I/O Ports:

generated

through

four,

independent,

10-bit

– 1.8-V to 5.5-V Operation

digital-to-analog converters (DACs). Additional digital

signal monitoring and control is accomplished through

•

Low-Power SPI

™-Compatible Serial Interface:

twelve configurable GPIOs. An internal reference can

– 4-Wire Mode, 1.8-V to 5.5-V Operation

be used to drive the ADC and DACs.

– SCLK up to 30 MHz

Communication to the device is performed through a

•

Temperature Range:

–40°C to +105°C

versatile, four-wire serial interface compatible with

•

Low Power: 32.5 mW at 5 V, Full Operating

industry-standard

microprocessors

and

Conditions

microcontrollers. The serial interface can operate at

clock rates up to 30 MHz, allowing quick access to

•

Space-Saving Package: 36-pin,

critical system data.

6-mm x 6-mm QFN

The device is characterized for operation over the

temperature range of

–40ºC to 105ºC and is available

in a very small, 36-pin, 6-mm x 6-mm QFN package.

The

AMC7891

’s

low

power,

small

size

and

high-integration make it an ideal low-cost, bias control

circuit for modern RF transistor modules such as the

power amplifiers (PA) and low-noise amplifiers (LNA)

found in RF communication systems. The AMC7891

feature set is similarly beneficial in general purpose

monitor and control systems.

For applications that require a different channel

count, additional features, or converter resolutions,

Texas Instruments offers a complete family of Analog

Monitor

and

Control

(AMC)

Products.

See

http://www.ti.com/amc.

1

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.

2

SPI is a trademark of Motorola, Inc.

3

All other trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.

Copyright

© 2011, Texas Instruments Incorporated

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.