Analog Devices Inc. AD7134 4-Channel Precision ADC

Analog Devices Inc. AD7134 4-Channel Precision Analog-to-Digital Converter (ADC) is a low noise, simultaneous sampling, precision analog-to-digital converter (ADC) that delivers on functionality, performance, and ease of use. Based on the continuous-time sigma-delta (CTSD) modulation scheme, the AD7134 removes the traditionally required switched capacitor circuitry sampling preceding the Σ-Δ modulator. This feature leads to a relaxation of the ADC input driving requirement. The Analog Devices AD7134 CTSD architecture also inherently rejects signals around the ADC aliasing frequency band, giving the device its inherent antialiasing capability, and removes the need for a complex external antialiasing filter.

The AD7134 has four independent converter channels in parallel, each with a CTSD modulator and a digital decimation and filtering path. The AD7134 enables simultaneous sampling of four separate signal sources, each supporting a maximum input bandwidth of 391.5kHz and achieving tight phase matching between these four signal measurements. The high level of channel integration, together with its simplified analog front-end requirement, enables the AD7134 to provide a high-density multichannel data acquisition solution in a small form factor.

Features

  • Inherent antialias rejection of 102.5dB typical in high-performance mode
  • Excellent AC and DC performance
    • 108dB dynamic range at ODR = 374kSPS, FIR filter, typical
    • 137dB dynamic range at ODR = 10SPS, sinc3 filter, typical
    • -120dB typical with 1kHz input tone THD
    • 0.7µV/°C typical offset error drift
    • 2ppm/°C typical gain drift
    • ±2ppm of FSR typical INL
  • 4:1 and 2:1 averaging mode dynamic range enhancement
    • 126dB, a weighted dynamic range
  • Resistive ADC and reference input
  • Easy to sync asynchronous sample rate converter
    • Multidevice synchronization with one signal line
    • Programmable data rates from 0.01kSPS to 1496kSPS with resolution of 0.01SPS
    • Option to control output data rate by an external signal
  • Linear phase digital filter options
    • Low ripple FIR filter: 32µdB pass-band ripple, dc to 161.942kHz
    • Low latency sinc3 filter and sinc6 filter, dc to 391.5kHz
    • Sinc3 filter with 50Hz/60Hz rejection
  • 130.7dBFS crosstalk 
  • Daisy-chaining
  • CRC error checking on data and SPI interface
  • High-performance mode and low power mode
  • 4.5V to 5.5V and 1.65V to 1.95V power supply
  • 1.8V IOVDD level
  • 4.096V or 5V external reference
  • Crystal or external CMOS clock of 48MHz
  • SPI or pin (standalone) configurable operation
  • Operating temperature range: 0°C to +85°C
  • Available in 8mm x 8mm, 56-lead LFCSP with exposed pad

Applications

  • Electrical test and measurement
  • Audio test
  • 3-phase power quality analysis
  • Control and hardware in loop verification
  • Sonars
  • Condition monitoring for predictive maintenance
  • Acoustic and material science research and development

Videos

Functional Block Diagram

Block Diagram - Analog Devices Inc. AD7134 4-Channel Precision ADC
Publicado: 2020-06-09 | Actualizado: 2022-03-11