4-Channel

MUX

CH0

CH1

CH2

CH3

MUXOUT

ADCIN

AVDD

DVDD

AGND

DGND

SAR

ADC

DataBuffers,

Sequencer,and

Alarms

I C

Interface

2

SDA

SCL

A0

INT

PWRCON

RESET

Oscillator

ADS7924

www.ti.com

SBAS482A – JANUARY 2010 – REVISED MAY 2010

2.2V, 12-Bit, 4-Channel, microPOWER™

Check for Samples: ADS7924

1

FEATURES

DESCRIPTION

234

•

Intelligent Monitoring:

The

ADS7924

is

a

four-channel,

12-bit,

analog-to-digital

converter

(ADC)

with

–

Auto-Sequencing of 4-Channel Multiplexer

interface. With its low-power ADC core, support for

–

Individual Alarm Thresholds for Each

low-supply operation, and a flexible measurement

Channel

sequencer

that

essentially

eliminates

power

–

Programmable Scan Rate

consumption between conversions, the ADS7924

forms a complete monitoring system for power-critical

•

Micropower Monitoring:

applications such as battery-powered equipment and

–

Four-Channel Scanning:

energy harvesting systems.

–

Every 1ms

→ 25mW

The ADS7924 features dedicated data registers and

–

Every 10ms

→ 5mW

onboard programmable digital threshold comparators

–

< 1µA of Power-Down Current

for each input. Alarm conditions can be programmed

that generate an interrupt. The combination of data

–

Programmable Interrupt Pin Controls

buffering, programmable threshold comparisons, and

Shutdown/Wakeup of the Microcontroller

alarm interrupts minimize the host microcontroller

–

Auto Power-Down Control

time needed to supervise the ADS7924.

–

PWRCON Pin Allows Shutdown of External

The four-channel input multiplexer (MUX) is routed

Op Amp

through external pins to allow a common signal

•

Wide Supply Range:

conditioning circuit to be used between the MUX and

–

Analog Supply: 2.2V to 5.5V

ADC, thereby reducing overall component count. The

low-power ADC uses the analog supply as its

–

Digital Supply: 1.65V to 5.5V

reference and can acquire and convert signals in only

•

Small Footprint: 3mm × 3mm QFN

10ms. An onboard oscillator eliminates the need to

supply a master clock.

APPLICATIONS

The ADS7924 is offered in a small 3mm × 3mm QFN

•

Portable and Battery-Powered Systems:

and is fully specified for operation over the industrial

–

Medical, Communications, Remote Sensor

temperature range of –40°C to +85°C.

Signal Monitoring, Power-Supply

Monitoring

•

Energy Harvesting

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

microPOWER is a trademark of Texas Instruments Incorporated.

3

4

All other trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.

Copyright © 2010, 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.