AD7933 Datasheet

• Throughput rate: 1.5 MSPS
• Specified for V_DD of 2.7 V to 5.25 V
• Low power 
  6 mW maximum at 1.5 MSPS with 3 V supplies 
  13.5 mW maximum at 1.5 MSPS with 5 V supplies
• Software configurable analog inputs 
  4-channel single-ended inputs 
  2-channel fully differential inputs 
  2-channel pseudo differential inputs
• 4 analog input channels with a sequencer
• 70 dB SINAD at 50 kHz input frequency
• No pipeline delays
• High speed parallel interface—word/byte modes
• Full shutdown mode: 2 μA maximum
• 28-lead TSSOP package

The AD7933 are 10-bit, high speed, low power, successive approximation (SAR) analog-to-digital converters (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-and-hold amplifier that handles input frequencies up to 50 MHz.

The AD7933 feature four analog input channels with a channel sequencer that allows a preprogrammed selection of channels to be sequentially converted. These parts can accept either single-ended, fully differential, or pseudo differential analog inputs.

The conversion process and data acquisition are controlled using standard control inputs that allow for 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 AD7933 has an accurate on-chip 2.5 V reference that is used as the reference source for the analog-to-digital conversion. Alternatively, this pin can be overdriven to provide an external reference.

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.

PRODUCT HIGHLIGHTS

1. High throughput with low power consumption.
2. Four analog inputs with a channel sequencer.
3. Accurate on-chip 2.5 V reference.
4. Single-ended, pseudo differential or fully differential analog inputs that are software selectable.
5. Single-supply operation with V_DRIVE function. The V_DRIVE function allows the parallel interface to connect directly to 3 V or 5 V processor systems independent of V_DD.
6. No pipeline delay.
7. Accurate control of the sampling instant via a CONVST input and once-off conversion control.