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AD Releases New High-Performance Analog-to-Digital Converters

New 2-MSPS 18-bit SAR ADC’s with high input-impedance mode are ideal for data acquisition designs

Analog Devices, has released a new generation of high-precision successive-approximation (SAR) analog-to-digital converters (ADCs) that uniquely combine the attributes of high performance, low power, small footprint, and ease of use.

Click for Larger Image - Analog Devices Releases New High-Performance Analog-to-Digital Converters These ICs enable mobile test and measurement instruments to operate for longer duration during field tests together with improving measurement accuracy and repeatability. The new devices also support development of smaller-sized instruments which can be placed closer to the sensors being measured, or allow for an increased number of data acquisition channels in the same form factor. An instrument with these characteristics will enhance the efficiency of field testing and reduce the costs associated with new product characterization time.

The high performance and ease of use of the 2-MSPS, 18-bit AD4003 and 16-bit AD4000 SAR ADCs greatly ease the efforts of system designers tasked with achieving optimum performance in data acquisition designs within a shorter design cycle, and without the need for making often difficult and conflicting technical tradeoffs. Features such as high input-impedance mode and span-compression mode reduce the design challenge associated with the ADC driver stage and increase the flexibility of amplifier selection. The high input-impedance mode allows the use of low power precision amplifiers to directly drive the ADC, and reduces the signal-chain power demands. In addition, the internal overvoltage protection removes the need for external protection devices, and the span compression enables the ADC driver stage to operate from the same supply rail as the ADC, thus simplifying power management. This combination supports increased channel density while lowering the system-level power requirements, without affecting the performance.

Features of the AD4003 18-bit SAR ADC

  • Throughput: 2 MSPS/1 MSPS/500 kSPS options
  • INL: ±1.0 LSB (±3.8 ppm) maximum
  • Guaranteed 18-bit no missing codes
  • Low power
    • 4.9 mW/MSPS, 2.4 mW at 500 kSPS, VDD only
    • 8 mW/MSPS, 80 µW at 10 kSPS, 16 mW at 2 MSPS total
  • SNR: 100.5 dB at fIN = 1 kHz, 99 dB at fIN = 100 kHz
  • Oversampled SNR:
    • 103.5 dB at 1.0 MSPS, OSR=2
    • 130.5 dB at 1.9 kSPS, OSR=1024
  • THD: −123 dB at fIN = 1 kHz; −100 dB at fIN = 100 kHz
  • SINAD: 89 dB at fIN = 1 MHz
  • Easy Drive
    • Greatly reduced input kickback
    • Long acquisition phase, ≧79% of cycle time at 1 MSPS
    • Input span compression for single-supply operation
    • Input overvoltage clamp protection sinks up to 50 mA
  • Differential input range: ±VREF
  • VREF input range from 2.4 V to 5.1 V
  • Single 1.8 V supply operation with 1.71 V to 5.5 V logic interface
  • Fast conversion time allows low SPI clock rates
  • First conversion accurate, no latency/pipeline delay
  • Ability to daisy-chain multiple ADCs
  • SPI-/QSPI-/MICROWIRE-/DSP-compatible serial interface

More information on the AD4003 successive-approximation analog-to-digital converter, can be found on the Analog Devices website at Analog Devices AD4003 product page

The Analog Devices website address is www.analog.com.
[Reprinted with kind permission from Analog Devices - Release Date, 3rd November, 2016]