Texas Instruments REF60xx/REF61xx High-Precision Voltage References

Texas Instruments REF60xx/REF61xx High-Precision Voltage References are a family of voltage references that has an integrated low output impedance buffer. This buffer enables the user to drive the REF pin of precision data converters directly while preserving linearity, distortion, and noise performance. Most precision SAR and Delta-Sigma ADCs, switch binary-weighted capacitors onto the REF pin during the conversion process. In order to support this dynamic load, the output of the voltage reference must be buffered with a low-output impedance (high-bandwidth) buffer. The Texas Instruments REF60xx/REF61xx family devices are well suited, but not limited, to drive the REF pin of the ADS88xx family of SAR ADCs, and the ADS127xx family of delta-sigma ADCs, as well as other digital-to-analog converters (DACs).

Features

  • Excellent temperature drift performance
    • REF60xx: 5ppm/°C (max) from –40°C to +125°C
    • REF61xx: 8ppm/°C (max) from –40°C to +125°C
  • Extremely low noise
    • 5µVRMS with 47µF capacitor total noise 
    • 3µVPP/V 1/f noise (0.1Hz to 10Hz) 
  • Integrated ADC drive buffer
    • < 50mΩ (0-200kHz) low output impedance 
    • First sample precise to 18 bits with ADS8881
    • Enables burst-mode DAQ systems
  • 820µA low supply current
  • 1µA low shutdown current 
  • ±0.05% high initial accuracy 
  • Very low noise and distortion
    • SNR: 100.5dB, THD: –125dB (ADS8881)
    • SNR: 106dB, THD: –120dB (ADS127L01)
  • ±4mA output current drive 
  • Programmable short-circuit current
  • Verified to drive REF pin of ADS88xx family of SAR ADCs and ADS127xx family of wideband ΔΣ ADCs

Applications

  • ATE testers and oscilloscopes
  • Test and measurement equipment
  • Analog input modules for PLCs
  • Medical equipment
  • Precision data acquisition systems

Functional Block Diagram

Block Diagram - Texas Instruments REF60xx/REF61xx High-Precision Voltage References
Đã phát hành: 2016-09-13 | Đã cập nhật: 2022-03-11