GENERAL DESCRIPTION

The AD7450 is a 12-bit, high-speed, low power, successive approximation (SAR) analog-to-digital converter that features a fully differential analog input. It operates from a single 3 V or 5 V power supply and features throughput rates up to 833 kSPS or 1 MSPS, respectively.

This part contains a low noise, wide bandwidth, differential track and-hold amplifier (T/H) that can handle input frequencies in excess of 1 MHz with the –3 dB point typically being 20 MHz. The reference voltage for the AD7450 is applied externally to the VREF pin and can be varied from 100 mV to 3.5 V, depending on the power supply and what suits the application. The value of the reference voltage determines the common-mode voltage range of the part. With this truly differential input structure and variable reference input, the user can select a variety of input ranges and bias points.

FEATURES

  Fast Throughput Rate: 1 MSPS

  Specified for VDD of 3 V and 5 V

  Low Power at Max Throughput Rate:

     3.75 mW Max at 833 kSPS with 3 V Supplies

     9 mW Max at 1 MSPS with 5 V Supplies

  Fully Differential Analog Input

  Wide Input Bandwidth:

     70 dB SINAD at 300 kHz Input Frequency

  Flexible Power/Serial Clock Speed Management

  No Pipeline Delays

  High-Speed Serial Interface—SPITM/QSPI™ MICROWIRE™/DSP Compatible

  Power-Down Mode: 1 μA Max

  8-Lead μSOIC and SOIC Packages

APPLICATIONS

  Transducer Interface

  Battery-Powered Systems

  Data Acquisition Systems

  Portable Instrumentation

  Motor Control

  Communications