LOW DISTORTION DIGITAL-TO-ANALOG CONVERTER FOR SEISMIC
• Single-Chip Test Signal Generator
Buffered Voltage Output
– 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
Analog Supply: 5 V or ±2.5 V
Digital Supply: 1.8 V to 3.3 V
Power: 38 mW
Operating Range: –50°C to +125°C
Seismic Monitoring Systems
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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.
Check for Samples:
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
devices create a measurement system that meets the
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
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.
Optional Bitstream Input
SBAS490 – DECEMBER 2011
analog-to-digital converters (ADCs), these
Copyright © 2011, Texas Instruments Incorporated