Analog Devices Inc. AD7921AUJZ-R2

Description
The AD7911/AD7921 are 10-bit and 12-bit, high-speed, low-power, 2-channel successive approximation ADCs, respectively. They operate from a single 2.35 V to 5.25 V power supply and feature throughput rates of up to 250 kSPS. The parts contain a low noise, wide bandwidth track-and-hold amplifier, which can handle input frequencies in excess of 6 MHz. The conversion process and data acquisition are controlled using CS and the serial clock, allowing the devices to interface with microprocessors or DSPs. The input signal is sampled on the falling edge of CS, and the conversion is also initiated at this point. There are no pipeline delays associated with the part. The channel to be converted is selected through the DIN pin, and the mode of operation is controlled by CS. The serial data stream from the DOUT pin has a channel identifier bit, which provides information about the converted channel.

Features
2-channel, 250 kSPS, 10-/12-bit ADCs in TSOT package
Low power consumption:
4 mW typ at 250 kSPS with 3 V supplies
13.5 mW typ at 250 kSPS with 5 V supplies
Wide input bandwidth: 71 dB minimum SNR at 100 kHz input frequency
Flexible power/serial clock speed management
No pipeline delays
High-speed serial interface: SPI/QSPI™/MICROWIRE/DSP compatible
Standby mode: 1 μA maximum
8-lead TSOT package
8-lead MSOP package

Applications
Battery-powered systems:
Personal digital assistants
Medical instruments
Mobile communications
Instrumentation and control systems
Data acquisition systems
High-speed modems
Optical sensors