AD7935

The AD7936/AD7935 are 12- and 10- Bit, high speed, low power, successive approximation (SAR) ADCs. The parts operate from a single 2.7 V to 5.25 V power supply and feature throughput rates up to 1.5 MSPS. The parts contain a low noise, wide bandwidth, differential track/hold amplifier that can handle input frequencies up to 20 MHz.

The AD7936/AD7935 feature 8 analog input channels with a channel sequencer to allow a pre-programmed selection of channels to be converted sequentially. These parts can operate with either Single-ended, Fully Differential or Pseudo Differential analog inputs. The analog input configuration is chosen by setting the relevant bits in the on-chip Control Register. The conversion process and data acquisition are controlled using standard control inputs allowing easy interfacing to Microprocessors and DSPs. The input signal is sampled on the falling edge of CONVST and the conversion is also initiated at this point.

The AD7936/AD7935 have an accurate on-chip 2.5 V reference that can be used as the reference source for the analog to digital conversion. Alternatively, this pin can be overdriven to provide an external reference in the range 100 mV to 3.5 V. These parts use advanced design techniques to achieve very low power dissipation at high throughput rates. They also feature flexible power management options. An on-chip Control Register allows the user to set up different operating conditions including analog input range and configuration, output coding, power management and channel sequencing.