AD7922

2-Channel, 2.35 V to 5.25 V, 1 MSPS, 10-/12-Bit ADCs AD7912/AD7922 FEATURES 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 15.5mW 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: 1 µA maximum Daisy-chain mode 8-lead TSOT package 8-lead MSOP package FUNCTIONAL BLOCK DIAGRAM VDD VIN0 MUX VIN1 T/H 10-/12-BIT SUCCESSIVE APPROXIMATION ADC SCLK CS AD7912/AD7922 CONTROL LOGIC DOUT 04351-0-001 DIN GND APPLICATIONS Battery-powered systems: Personal digital assistants Medical instruments Mobile communications Instrumentation and control systems Data acquisition systems High speed modems Optical sensors Figure 1. Several AD7912/AD7922 can be connected together in a daisy chain. The AD7912/AD7922 feature a daisy-chain mode that allows the user to read the conversion results from the ADCs contained in the chain. The AD7912/AD7922 use advanced design techniques to achieve very low power dissipation at high throughput rates. The reference for the part is taken internally from VDD, thereby allowing the widest dynamic input range to the ADC. GENERAL DESCRIPTION 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...