ADI AD7912ARMZ

The AD7912/AD7922 are 10-bit and 12-bit, high speed, low power, 2-channel successive approximation ADCs, respectively. The parts operate from a single 2.35 V to 5.25 V power supply and feature throughput rates of up to 1 MSPS. 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 conversion rate is determined by the SCLK signal. The input signal is sampled on the falling edge of CS and the conversion is also initiated at this point. 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 and mode identifier bit, which provide information about the converted channel and the current mode of operation.

• Fast throughput rate: 1 MSPS
• Specified for VDD of 2.35 V to 5.25 V
• Low power: 4.8 mW typ at 1 MSPS with 3 V supplies, 15.5 mW typ at 1 MSPS 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: μA maximum
• Daisy-chain mode
• 8-lead TSOT package
• 8-lead MSOP package

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