The conversion process and data acquisition are controlled by CS and the serial clock signal, allowing the device to easily interface with microprocessors or DSPs. The input signal is sampled on the falling edge of CS and conversion is also initiated at this point.
The AD7923 uses advanced design techniques to achieve very low power dissipation at maximum throughput rates. At maximum throughput rates, it consumes 1.2 mA maximum with 3 V supplies and 1.5 mA maximum with 5 V supplies.
Through the configuration of the control register, the analog input range can be selected as 0 V to REFIN or 0 V to 2 × REFIN, with either straight binary or twos complement output coding. The AD7923 features four single-ended analog inputs with a channel sequencer to allow a preprogrammed selection of channels to be converted sequentially.
The conversion time for the AD7923 is determined by the serial clock, SCLK, frequency, since this is used as the master clock to control the conversion. The conversion time can be as short as 800 ns with a 20 MHz SCLK.
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
The EVAL-AD7923CBZ is a fully featured evaluation kit for the AD7923. This board operates in stand alone mode or in conjunction with the Evaluation Controller board . When operated with the Evaluation Controller board, software is provided enabling the user to perform detailed analysis of the ADC's performance. This software includes the technical note describing the operation and set up of the evaluation board in standalone operation or when operated with the Evaluation Controller board.
Recommended Driver Amplifiers
- For low distortion, low noise, dual supplies , we recommend the AD8599 .
- For precision, low noise, low cost, single supply , we recommend the AD8605 or the AD8615 .
- For single supply, high speed, low power , we recommend the AD8031, ADA4841-1 or the ADA4899-1 .
- For low frequency and low bias current , we recommend the ADA4627-1 .
Recommended Precison References - 2.5V
- For cost sensitive applications , we recommend the AD1582 or the ADR391 .
- For applications requiring the lowest noise performance and output trim adjust , we recommend the ADR441 .
- For high output current applications , we recommend the ADR431 or the REF192 .
- For wide supply applications , we recommend the AD780 .
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The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.