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AD7903 Dataheets PDF



Part Number AD7903
Manufacturers Analog Devices
Logo Analog Devices
Description PulSAR ADC
Datasheet AD7903 DatasheetAD7903 Datasheet (PDF)

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 .

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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 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. Table 1. MSOP 14-/16-/18-Bit PulSAR® ADCs Bits 18 16 100 kSPS 250 kSPS AD76911 AD76851 AD76871 AD7694 AD79421 400 kSPS to 500 kSPS AD76901 AD76861 AD76881 AD76931 AD79461 1000 kSPS AD79821 AD79801 AD7903 AD7902 ADC Driver ADA4941-1 ADA4841-x ADA4941-1 ADA4841-x APPLICATIONS Battery-powered equipment Communications Automated test equipment (ATE) Data acquisition Medical instrumentation Redundant measurement Simultaneous sampling 14 1 AD7680 AD7683 AD7684 AD7940 Pin-for-pin compatible. FUNCTIONAL BLOCK DIAGRAM REF = 2.5V TO 5V 2.5V REF1 REF2 VDD1 VDD2 VIO1 SDI1 SCK1 CNV1 SDO1 VIO2 SDI2 SCK2 CNV2 SDO2 VIO1/VIO2 SDI1/SDI2 SCK1/SCK2 CNV1/CNV2 SDO1 ADA4941-1 REF IN1+ ADC1 ±10V, ±5V, ... IN1– ADA4941-1 REF IN2+ ADC2 ±10V, ±5V, ... IN2– GND 3-WIRE OR 4-WIRE INTERFACE (SPI, CS, AND CHAIN MODES) SDO2 11755-001 AD7903 Figure 1. Rev. 0 Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Specifications subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarks and registered trademarks are the property of their r.


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