AD7856: 5V Single Supply, 285kSPS 8-Channel, 14-Bit Sampling ADC
Introduction
This Technical Note describes the evaluation board for the AD7856 high speed, low power, 14-bit ADC that operates from a single 5 V power supply. The ADC powers up with a set of default conditions at which time it can be operated as a read only ADC. The ADC contains self-calibration and system calibration options to ensure accurate operation over time and temperature and it has a number of power-down options for low power applications. The AD7856 is capable of 285 kHz throughput rate. The input track-and-hold acquires a signal in 500 ns and features a pseudo-differential sampling scheme. The AD7856 voltage range is 0 to VREF with straight binary output coding. Input signal range is to the supply and the part is capable of converting full power signals to 10 MHz. Full data on the AD7856 is available in the AD7856 data sheet available from Analog Devices and should be consulted in conjunction with this Technical Note when using the Evaluation Board.
On-board components include two OP467 quad op-amps, two AD712 dual op-amps, a 74HC04 inverter and a 74HC08 AND gate.
The evaluation board is compatible with the EVALUATION BOARD CONTROLLER.
Documentation
Technical notes are available in Adobe Acrobat Portable Document Format (PDF).
To download the Technical Note, select the link below:
- EVAL-AD7856CB Documentation (pdf, 732,700 bytes)
Software
Included in the EVAL-AD7856CB evaluation board package is a software for controlling and evaluating the performance of the AD7856 when it is operated with the EVALUATION BOARD CONTROLLER. The EVAL-AD7856CB Demonstration/Evaluation Software runs under Windows 95 & 98. The user interface on the PC is via a dedicated program written especially for the EVAL-AD7856.
To download the software, select the link below:
- AD7856.zip (zip, 4,782,584 bytes)