Very Low Distortion Digital-to-Analog Converter for Seismic Applications - DAC1280

DAC1280 (ACTIVE)

Very Low Distortion Digital-to-Analog Converter for Seismic Applications

Description

The DAC1280 is a very low distortion digital-to-analog converter (DAC) suited for performance testing of seismic equipment. The DAC1280 provides a 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.

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.

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.

Features

  • Outstanding Performance:
    • THD: –125dB
    • SNR: 120dB (413Hz BW, Gain = 1/1)
    • Gain Error: 0.1%
  • 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
  • APPLICATIONS
    • Energy Exploration Equipment
    • Seismic Monitoring Systems

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Parametrics Compare all products in Precision DAC (=<10MSPS)

 
DAC: Channels
Architecture
Interface
Output Type
Output Range Min. (V or mA)
Output Range Max. (V or mA)
Settling Time (µs)
Reference: Type
Rating
Pin/Package
Approx. Price (US$)
Operating Temperature Range (C)
Special Features
DAC1280 DAC1282
1     1    
Current-Steering     Current-Steering    
Bitstream     Serial SPI    
Current     Buffered Voltage    
0.039     0.039    
2.5     2.5    
100     100    
Ext     Ext    
Catalog     Catalog    
16TSSOP     24TSSOP    
18.45 | 1ku     24.85 | 1ku    
-40 to 85     -40 to 85    
  SDO    

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Companion parts

Part # Name Product Family Comments
ADS1282   Ultra High Resolution Delta Sigma ADC with PGA for Seismic and Energy Exploration   Sensor Products - Seismic Signal Conditioning    Ultra High Resolution Delta Sigma ADC with PGA for Seismic and Energy Exploration for use with DAC1280  
TPS7A3001   Vin -3V to -36V, -200mA, Ultra-Low Noise, High PSRR, Low-Dropout Linear Regulator   LINEAR REGULATOR (LDO) - SINGLE CHANNEL LDO    The negative-voltage TPS7A3001 LDO, when paired with the positive voltage TPS7A4901 LDO, provides designers with a total solution for powering precision analog applications. These LDOs feature ultra-high PSRR performance with output noise as low as 16 �Vrms and are designed to power noise-sensitive applications. Please look at ti.com/pmp5863.
See Literature slvt170  See Literature SLVT170, Power management for Precision Analog  
OPA211   1.1nV/rtHz Noise, Low Power, Precision Operational Amplifier in Tiny DFN-8 Package   OPERATIONAL AMPLIFIER - PRECISION AMPLIFIER    Low noise drive amplifier  
TPS7A4901   Vin 3V to 36V, 150mA, Ultra-Low Noise, High PSRR, Low-Dropout Linear Regulator   LINEAR REGULATOR (LDO) - SINGLE CHANNEL LDO    The negative-voltage TPS7A3001 LDO, when paired with the positive voltage TPS7A4901 LDO, provides designers with a total solution for powering precision analog applications. These LDOs feature ultra-high PSRR performance with output noise as low as 16 �Vrms and are designed to power noise-sensitive applications. Please look at ti.com/pmp5863.
See Literature slvt170  See Literature SLVT170, Power management for Precision Analog  
REF5050   Low Noise, Very Low Drift, Precision VOLTAGE REFERENCE   VOLTAGE REFERENCE - SERIES VOLTAGE REFERENCE    Low noise voltage reference  
ADS1281   High Resolution 24-Bit Analog-to Digital Converter   Sensor Products - Seismic Signal Conditioning    Single channel seismic sensor ADC  
TLV3491   Single Nanopower Push-Pull Output Comparator   AMPLIFIERS AND LINEAR - COMPARATOR    Shutdown comparator  
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