DAC1282 Datasheet, PDF (1/43 Pages) Texas Instruments – LOW DISTORTION DIGITAL-TO-ANALOG CONVERTER FOR SEISMIC

DAC1282
www.ti.com
SBAS490 – DECEMBER 2011
LOW DISTORTION DIGITAL-TO-ANALOG CONVERTER FOR SEISMIC
Check for Samples: DAC1282
FEATURES
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•23 Single-Chip Test Signal Generator
• Buffered Voltage Output
• High Performance:
– THD: –125 dB (G = 1/1 to 1/8)
– SNR: 120 dB (413 Hz BW, G = 1/1)
• Analog and Digital Gain Control
• Output Frequency: 0.488 Hz to 250 Hz
• Sine, Pulse, and DC Modes
• Digital Data Input Mode
• Low On-Resistance Signal Switch
• Sync Input
• Power-Down Mode
• Analog Supply: 5 V or ±2.5 V
• Digital Supply: 1.8 V to 3.3 V
• Power: 38 mW
• Package: TSSOP-24
• Operating Range: –50°C to +125°C
APPLICATIONS
• Energy Exploration
• Seismic Monitoring Systems
• High-Accuracy Instrumentation
DESCRIPTION
The DAC1282 is a fully-integrated digital-to-analog
converter (DAC) providing low distortion, digital
synthesized voltage output suitable for testing of
seismic equipment. The DAC1282 achieves very high
performance in a small package with low power.
Together, with the high-performance ADS1281 and
ADS1282 analog-to-digital converters (ADCs), these
devices create a measurement system that meets the
exacting demands of seismic data acquisition
equipment.
The DAC1282 integrates a digital signal generator, a
DAC, and an output amplifier providing sine wave, dc,
and pulse output voltages.
The output frequency is programmable from 0.5 Hz to
250 Hz and the magnitude is scaled by both analog
and digital control. The analog gain is adjustable in
6-dB steps and the digital gain in 0.5-dB steps. The
analog gain settings match those of the ADS1282 for
testing at all gains with high resolution.
The DAC1282 also provides pulse outputs. The pulse
amplitude is user-programmed and then selected by
the pin for precise timing. Custom output signals can
be generated by applying an external bitstream
pattern.
A signal switch can be used to connect the DAC
output to sensors for THD and impulse testing. The
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.
CLK
SYNC
CS
DIN
DOUT
SCLK
RESET/ PWDN
SW/TD
DVDD
DAC1282
Serial
Interface
Digital
Signal
Generator
Optional Bitstream Input
VREF
AVDD
Voltage
Output
DAC
VOUTP
VOUTN
Switch In
Switch Out
DGND
AVSS
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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.
SPI is a trademark of Motorola.
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All other trademarks are the property of their respective owners.
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PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2011, Texas Instruments Incorporated