AD7380/7381 Dual Simultaneous Sampling SAR ADCs

By Analog Devices Inc 64

AD7380/7381 Dual Simultaneous Sampling SAR ADCs

Analog Devices' AD7380 and AD7381 are 16-bit/14-bit pin-compatible, dual simultaneous sampling, high-speed, low-power, successive approximation register (SAR) analog-to-digital converters (ADCs) that operate from a 3.0 V to 3.6 V power supply and feature throughput rates up to 4 MSPS. The analog input type is differential, accepts a wide common-mode input voltage, and is sampled and converted on the falling edge of the chip select (CS).

Integrated on-chip oversampling blocks improve dynamic range and reduce noise at lower bandwidths. A buffered internal 2.5 V reference is included. Alternatively, an external reference up to 3.3 V can be used.

The conversion process and data acquisition use standard control inputs allowing easy interfacing to microprocessors or digital signal processors (DSPs). It is compatible with 1.8 V, 2.5 V, and 3.3 V interfaces using the separate logic supply.

The AD7380/1 devices are available in a 16-lead lead frame chip-scale package (LFCSP) with operation specified from -40°C to +125°C.

Features
  • 16-bit/14-bit available
  • Dual simultaneous sampling
  • Fully differential analog inputs
  • Throughput conversion rate: 4 MSPS
  • Signal-to-noise ratio (SNR) (typ.):
    • 92.5 dB, VREF = 3.3 V external at 16-bit (AD7380)
    • 85.4 dB, VREF = 3.3 V external at 14-bit (AD7381)
  • On-chip oversampling function
  • Resolution boost function
  • Alert function
  • SNR 102.8 dB (typ.) with x32 OSR
  • Integral nonlinearity (INL) (maximum):
    • 2.0 LSBs at 16-bit
    • 1.0 LSB at 14-bit
  • Internal reference: 2.5 V at 10 ppm/°C
  • High-speed serial interface
  • Operating temperature range: -40°C to +125°C
  • Package: 3 mm x 3 mm 16-lead LFCSP
  • Wide common-mode range
Applications
  • Motor control position feedback
  • Motor control current-sensing
  • Sonar
  • Power quality
  • Data acquisition systems
  • EDFA applications
  • I and Q demodulation

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