TI DAC1282IPWR

DAC1282 is a fully integrated DAC that provides low-distortion, digitally synthesized voltage output for testing seismic equipment. The DAC1282 achieves very high performance in a low-power, compact package. Together with the high-performance ADS1281 and ADS1282 ADCs, these devices can create a measurement system that meets the stringent requirements of seismic data acquisition equipment. The DAC1282 integrates a digital signal generator, a DAC, and an output amplifier capable of generating sine wave, DC, and pulse output voltages. The output frequency is programmable from 0.5 Hz to 250 Hz, and the magnitude is controlled by a combination of analog and digital controls. Analog gain and digital gain are adjustable in steps of 6 dB and 0.5 dB, respectively. The analog gain settings match those on the ADS1282 for testing at high-resolution gain settings. The DAC1282 also provides pulse output. The user can program the pulse amplitude, with selection made by pin and precise timing applied. Custom output signals can be generated by using an external bitstream pattern. A signal switch connects the DAC output to a sensor for THD and pulse testing. Switch timing is controlled by pin and command. The SYNC pin synchronizes the DAC output with the ADC sampling interval. A power-down input shuts down the device, reducing power consumption to the microwatt level.

• Single-chip test signal generator
• Buffered voltage output
• High performance
• THD: –125dB (G = 1/1 to 1/8)
• SNR: 120dB (413Hz BW, G = 1/1)
• Analog and digital gain control
• Output frequency: 0.488Hz to 250Hz
• Sine, pulse, and DC modes
• Digital data input mode
• Low on-resistance signal switching
• Sync input
• Power-down mode
• Analog supply: 5V or ±2.5V
• Digital supply: 1.8V to 3.3V
• Power: 38mW
• Package: 24-lead TSSOP
• Operating temperature range: -50°C to +125°C

• Energy exploration
• Seismic monitoring systems
• High-precision instrumentation