ADI AD7903BRQZ-RL7

The AD7903 is a dual-channel, 16-bit, successive approximation ADC with each ADC powered by a single supply (VDDx). It integrates two low-power, high-speed, 16-bit sampling ADCs and a versatile SPI. On the rising edge of CNVx, the AD7903 samples the voltage difference between the INx+ and INx− pins, where the voltage swing on these two pins is typically between 0 V and VREF in antiphase. The reference voltage (VREF) at the REFx pin is externally supplied and can be set independently of the supply voltage pin (VDDx). The device's power consumption scales linearly with throughput rate. The SPI-compatible serial interface also supports daisy-chaining multiple ADCs onto a single 3-wire bus via the SDIx input, and provides an optional busy indicator. With a separate supply VIOx, it is compatible with 1.8 V, 2.5 V, 3 V, and 5 V logic. The AD7903 is available in a 20-lead QSOP package and is rated for an operating temperature range of −40°C to +125°C.

• Throughput rate: 1 MSPS
• Low power consumption: 7.0 mW (1 MSPS, VDD1#IVDD2 only) 12.0 mW (1 MSPS, total power) 140 μW (10 kSPS)
• Integral nonlinearity (INL): ±0.5 LSB typical, ±2.0 LSB maximum
• Signal-to-noise and distortion ratio (SINAD): 93.5 dB (1 kHz)
• Total harmonic distortion (THD): −112 dB (1 kHz)
• True differential analog input range: ±VREF 0 V to VREF (VREF from 2.4 V to 5.1 V), either input range selectable, easily driven by ADA4941-1
• No pipeline delay
• 2.5 V single-supply operation with 1.8 V/2.5 V/3 V/5 V logic interface
• SPI/QSPI/MICROWIRE/DSP compatible
• 20-lead QSOP package
• Wide operating temperature range: -40°C to +125°C

• Battery-powered equipment
• Communications
• Automatic Test Equipment (ATE)
• Data acquisition
• Medical instrumentation
• Redundant measurement
• Simultaneous sampling