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DAC1282IPW Fiches technique(PDF) 1 Page - Texas Instruments |
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DAC1282IPW Fiches technique(HTML) 1 Page - Texas Instruments |
1 / 43 page 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. |
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