Digital

Signal

Generator

Serial

Interface

VREF

DVDD

AVDD

DGND

AVSS

CLK

SW/TD

SYNC

CS

DIN

DOUT

SCLK

PWDN

RESET/

DAC1282

Voltage

Output

DAC

VOUTN

VOUTP

Switch In

Optional Bitstream Input

Switch Out

DAC1282

www.ti.com

SBAS490

– DECEMBER 2011

LOW DISTORTION DIGITAL-TO-ANALOG CONVERTER FOR SEISMIC

Check for Samples: DAC1282

1

FEATURES

DESCRIPTION

The DAC1282 is a fully-integrated digital-to-analog

23

•

Single-Chip Test Signal Generator

converter (DAC) providing low distortion, digital

•

Buffered Voltage Output

synthesized voltage output suitable for testing of

•

High Performance:

seismic equipment. The DAC1282 achieves very high

performance in a small package with low power.

– THD: –125 dB (G = 1/1 to 1/8)

Together, with the high-performance ADS1281 and

– SNR: 120 dB (413 Hz BW, G = 1/1)

ADS1282 analog-to-digital converters (ADCs), these

•

Analog and Digital Gain Control

devices create a measurement system that meets the

exacting

demands

of

seismic

data

acquisition

•

Output Frequency: 0.488 Hz to 250 Hz

equipment.

•

Sine, Pulse, and DC Modes

The DAC1282 integrates a digital signal generator, a

•

Digital Data Input Mode

DAC, and an output amplifier providing sine wave, dc,

•

Low On-Resistance Signal Switch

and pulse output voltages.

•

Sync Input

The output frequency is programmable from 0.5 Hz to

•

Power-Down Mode

250 Hz and the magnitude is scaled by both analog

•

Analog Supply: 5 V or

±2.5 V

and digital control. The analog gain is adjustable in

6-dB steps and the digital gain in 0.5-dB steps. The

•

Digital Supply: 1.8 V to 3.3 V

analog gain settings match those of the ADS1282 for

•

Power: 38 mW

testing at all gains with high resolution.

•

Package: TSSOP-24

The DAC1282 also provides pulse outputs. The pulse

•

Operating Range:

–50°C to +125°C

amplitude is user-programmed and then selected by

the pin for precise timing. Custom output signals can

APPLICATIONS

be generated by applying an external bitstream

pattern.

•

Energy Exploration

•

Seismic Monitoring Systems

A signal switch can be used to connect the DAC

output to sensors for THD and impulse testing. The

•

High-Accuracy Instrumentation

switch timing is controlled by pin and by command.

A SYNC pin synchronizes the DAC output to the

analog-to-digital converter (ADC) sample interval. A

power-down input disables the device, reducing

power consumption to microwatts.

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.

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.