Catalog
Dual Differential 16-Bit, 1 MSPS PulSAR 12.0mW in QSOP
Key Features
• 16-bit resolution with no missing codes
• Throughput: 1 MSPS
• Low power dissipation7.0 mW at 1 MSPS (VDD1and VDD2only)12.0 mW at 1 MSPS (total)140 µW at 10 kSPS
• INL: ±0.5 LSB typical, ±2.0 LSB maximum
• True differential analog input range: ±VREF0 V to VREFwith VREFbetween 2.4 V to 5.1 VAllows use of any input rangeEasy to drive with the ADA4941-1
• SINAD: 93.5 dB at 1 kHz
• THD: −112 dB at 1 kHz
• No pipeline delay
• Single-supply 2.5 V operation with 1.8 V/2.5 V/3 V/5 V logic interface
• Serial interface SPI/QSPI/MICROWIRE/DSP compatible
• 20-lead QSOP package
• Wide operating temperature range: −40°C to +125°C
Description
AI
The AD7903 is a dual 16-bit, successive approximation, analog-to-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 interface port. 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 is compatible with 1.8 V, 2.5 V, 3 V, or 5 V logic, using the separate VIOx supplies.The AD7903 is available in a 20-lead QSOP package with operation specified from −40°C to +125°C.APPLICATIONSBattery-powered equipmentCommunicationsAutomated test equipment (ATE)Data acquisitionMedical instrumentationRedundant measurementSimultaneous sampling
