SBAS490B December   2011  – May 2015 DAC1282

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Device Comparison
  6. 6 Pin Configuration and Functions
  7. 7 Specifications
    1. 7.1 Absolute Maximum Ratings
    2. 7.2 ESD Ratings
    3. 7.3 Thermal Information
    4. 7.4 Electrical Characteristics
    5. 7.5 Timing Requirements: Serial Peripheral Interface (SPI) Timing
    6. 7.6 Typical Characteristics
  8. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Feature Description
      1. 8.2.1  Signal Output (VOUTP, VOUTN)
      2. 8.2.2  DAC Modes
        1. 8.2.2.1 Sine Mode
        2. 8.2.2.2 DC Mode
        3. 8.2.2.3 Pulse Mode
        4. 8.2.2.4 Digital Data Mode
      3. 8.2.3  Reference Voltage (VREF)
      4. 8.2.4  Output Filter (CAPP, CAPN)
      5. 8.2.5  Output Switch (SWINP, SWINN, SWOUTP, SWOUTN)
      6. 8.2.6  Clock Input (CLK)
      7. 8.2.7  Switch Control/External Digital Input (SW/TD)
        1. 8.2.7.1 SW Function
        2. 8.2.7.2 TD Function
      8. 8.2.8  SYNC
      9. 8.2.9  RESET/PWDN
      10. 8.2.10 AVDD, AVSS, and DVDD Power Supplies
        1. 8.2.10.1 Power Consumption
        2. 8.2.10.2 Offset and Gain Error
        3. 8.2.10.3 Signal-to-Noise Ratio (SNR)
        4. 8.2.10.4 DC Noise
        5. 8.2.10.5 Total Harmonic Distortion (THD)
      11. 8.2.11 Step Response
      12. 8.2.12 Frequency Response
    3. 8.3 Device Functional Modes
      1. 8.3.1 Serial Interface
        1. 8.3.1.1 Serial Communications
        2. 8.3.1.2 Chip Select (CS)
        3. 8.3.1.3 Serial Clock (SCLK)
        4. 8.3.1.4 Data Input (DIN)
        5. 8.3.1.5 Data Output (DOUT)
      2. 8.3.2 SPI Timeout
    4. 8.4 Programming
      1. 8.4.1 Commands
        1. 8.4.1.1 RREG: Read From Registers
        2. 8.4.1.2 WREG: Write To Registers
        3. 8.4.1.3 RESET: Device Reset
    5. 8.5 Register Map
      1. 8.5.1 Register Descriptions
  9. 9 Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Applications
      1. 9.2.1 Single-Channel Seismic System
      2. 9.2.2 Four-Channel Seismic System
  10. 10Device and Documentation Support
    1. 10.1 Community Resources
    2. 10.2 Trademarks
    3. 10.3 Electrostatic Discharge Caution
    4. 10.4 Glossary
  11. 11Mechanical, Packaging, and Orderable Information

Package Options

Mechanical Data (Package|Pins)
Thermal pad, mechanical data (Package|Pins)
Orderable Information

1 Features

  • Single-Chip Test Signal Generator
  • Buffered Voltage Output
  • High Performance:
    • 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
  • Sync Input
  • Power-Down Mode
  • Analog Supply: 5 V or ±2.5 V
  • Digital Supply: 1.8 V to 3.3 V
  • Power: 38 mW
  • Package: TSSOP-24
  • Operating Range: –50°C to +125°C

2 Applications

  • Energy Exploration
  • Seismic Monitoring Systems
  • High-Accuracy Instrumentation

3 Description

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 ADS1281 and ADS1282 analog-to-digital converters (ADCs), these devices create a measurement system that meets the exacting demands of seismic data acquisition equipment.

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 pattern.

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.

DAC1282 DAC1282A pg1_fbd_bas490.gif

4 Revision History

Changes from A Revision (September 2012) to B Revision

  • Added ADS1282A device to data sheetGo

Changes from * Revision (December 2011) to A Revision

  • Updated Figure 16Go
  • Added last paragraph to Signal Output sectionGo
  • Changed tCSHD minimum specification in Table 11Go
  • Changed min, max, and unit columns in Table 12Go