AD7903

Data Sheet FEATURES 16-bit resolution with no missing codes Throughput: 1 MSPS Low power dissipation 7.0 mW at 1 MSPS (VDD1 and VDD2 only) 12.0 mW at 1 MSPS (total) 140 µW at 10 kSPS INL: ±0.5 LSB typical, ±2.0 LSB maximum SINAD: 93.5 dB at 1 kHz THD: −112 dB at 1 kHz True differential analog input range: ±VREF 0 V to VREF with VREF between 2.4 V to 5.1 V Allows use of any input range Easy to drive with the ADA4941-1 No pipeline delay Single-supply 2.5 V operation with 1.8 V/2.5 V/3 V/5 V logic interface Serial port interface (SPI)/QSPI/MICROWIRE/DSP compatible 20-lead QSOP package Wide operating temperature range: −40°C to +125°C Dual Differential 16-Bit, 1 MSPS PulSAR ADC 12.0 mW in QSOP AD7903 GENERAL DESCRIPTION The AD7903 is a dual 16-bit, successive approximation, analogto-digital converter (ADC) that operates from a single power supply, VDDx, per ADC. It contains two low power, high speed, 16-bit sampling ADCs and a versatile serial port interface (SPI). On the CNVx rising edge, the AD7903 samples the voltage difference between the INx+ and INx− pins. The voltages on these pins usually swing in opposite phases between 0 V and VREF. The externally applied reference voltage of the REFx pins (VREF) can be set independently from the supply voltage pins, VDDx. The power of the device scales linearly with throughput. Using the SDIx inputs, the SPI-compatible serial interface can also daisy-chain multiple ADCs on a single 3-wire bus and provide an optional busy indicator. It...