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Description

The AD7476 / AD7477 / AD7478 are, respectively, 12-bit, 10-bit, and 8-bit, high speed, low power, successive approximation ADCs. The parts operate from a single 2.35 V to 5.25 V power supply and feature throughput rates up to 1 MSPS. Each part contains a low noise, wide bandwidth track-and-hold amplifier that can handle input frequencies in excess of 6 MHz. The conversion process and data acquisition are controlled using CSand the serial clock, allowing the devices to interface
with microprocessors or DSPs. The input signal is sampled on the falling edge of CSand the conversion is initiated at this point. There are no pipeline delays associated with these parts.

Features

1. Fast throughput rate: 1 MSPS
2. Specified for VDDof 2.35 V to 5.25 V
3. Low power
(1) 3.6 mW at 1 MSPS with 3 V supplies
(2) 15 mW at 1 MSPS with 5 V supplies
4. Wide input bandwidth
(1) 70 dB SNR at 100 kHz input frequency
5. Flexible power/serial clock speed management
6. No pipeline delays
7. High speed serial interface

Applications 

1. Battery-powered systems
2. Personal digital assistants
3. Medical instruments
4. Mobile communications
5. Instrumentation and control systems
6. Data acquisition systems
7. High speed modems
8. Optical sensors