GENERAL DESCRIPTION
The AD7440/AD7450A1 are 10-bit and 12-bit high speed, low power, successive approximation (SAR) analog-to-digital converters with a fully differential analog input. These parts operate from a single 3 V or 5 V power supply and use advanced design techniques to achieve very low power dissipation at throughput rates up to 1 MSPS. The SAR architecture of these parts ensures that there are no pipeline delays.
The parts contain a low noise, wide bandwidth, differential track-and-hold amplifier (T/H) that can handle input frequencies up to 3.5 MHz. The reference voltage 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
      4 mW max at 1 MSPS with 3 V supplies
      9.25 mW max at 1 MSPS with 5 V supplies
   Fully differential analog input
   Wide input bandwidth
      70 dB SINAD at 100 kHz input frequency
   Flexible power/serial clock speed management
   No pipeline delays
   High speed serial interface
      SPI®/QSPI™/MICROWIRE™/DSP compatible
   Power-down mode: 1 μA max
   8-lead SOT-23 and MSOP packages

APPLICATIONS
   Transducer interface
   Battery-powered systems
   Data acquisition systems
   Portable instrumentation
   Motor control