DAC1280
www.ti.com
SBAS432A –APRIL 2010–REVISED SEPTEMBER 2010
Low Distortion Digital-to-Analog Converter for Seismic Monitoring
Check for Samples: DAC1280
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FEATURES
DESCRIPTION
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Outstanding Performance:
The DAC1280 is a very low distortion digital-to-analog
converter (DAC) suited for performance testing of
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THD: –125dB
seismic equipment. The DAC1280 provides
a
SNR: 120dB (413Hz BW, Gain = 1/1)
Gain Error: 0.1%
high-accuracy output signal from a bitstream input.
The device achieves very high linearity in a small
package while dissipating only 18mW. Together with
the high-performance ADS1281 and ADS1282
analog-to-digital converters (ADCs), these devices
create a test and measurement system that meets
the exacting demands of energy exploration and
seismic monitoring equipment.
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Pin Operation: No Registers to Program
Gain: 1/1 to 1/64
SYNC Input for Phase Control
Power-Down Mode
Low Power: 18mW
Analog Supply: +5V or ±2.5V
Digital Supply: 1.8V to 3.3V
Small 16-Pin TSSOP Package
Temperature Range: –40°C to +85°C
The DAC1280 is designed to match the system
components (power supply, clock and reference
voltage) of the companion ADCs, the ADS1281 and
ADS1282. The input to the DAC1280 is a 1s density
modulated bitstream. The DAC1280 output is a
differential current intended for use with an active I/V
converter. The I/V converter provides a voltage output
suitable for performance testing of sensors and
ADCs.
APPLICATIONS
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Energy Exploration Equipment
Seismic Monitoring Systems
Three gain control pins set the output range in 6dB
steps from 0dB to –36db (±2.5V to ±0.039V
differential). The attenuation ranges match the gains
of the ADS1282 for testing at all gains. The DAC
uses a reference voltage and bias resistor to set the
full-scale output. The resistor can be adjusted to
fine-trim the DAC full-scale.
The SYNC pin aligns the input data sampling to the
CLK phase. A power-down pin shuts down the device
when not in use. The DAC1280 is available in a
small, 16-pin TSSOP package and is fully specified
for operation over –40°C to +85°C temperature range
with a maximum operating temperature of +125°C.
DVDD
VREF
AVDD
External I/V Converter
PWDN
SYNC
CLK
Current Output
Differential DAC
VOUT
Synchronization
Bitstream
Source
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DAC1280
DGND
GAIN[2:0]
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.
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All trademarks are the property of their respective owners.
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 © 2010, Texas Instruments Incorporated
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