Analog DevicesEVAL-AD7794EBZ数据转换开发电路板和套件

the evaluation board for the AD7794,
which is a low power, 24-bit sigma-delta (Σ-Δ) ADC. The AD7794
is a complete analog front end for low frequency measurement applications. It contains six differential inputs and includes a
low noise instrumentation amplifier, an embedded reference, programmable current sources, and a low side power switch.
The update rate can be varied from 4.17 Hz to 470 Hz. It also has an on-board clock eliminating the need for an external clock. It employs a Σ-Δ conversion technique to realize up to 24 bits of no missing codes performance. The input signal is applied to an analog modulator. The modulator output is processed by an on-chip digital filter. The analog input channel
of the AD7794 accepts analog input signals of ±VREF/gain, with gain equal to 1 to 128. With a gain of 64 and the update rate programmed to 16.7 Hz, the rms noise is 87 nV. Simultaneous
50 Hz/60 Hz rejection is available at this data update rate also. Full data on the AD7794 is available in the AD7794 data sheet
available from Analog Devices, Inc. and should be consulted in
conjunction with this data sheet when using the evaluation board. The evaluation board interfaces to the USB port of an IBM-
compatible PC. Software is available with the evaluation board, which allows the user to easily communicate with the AD7794. Note that the AD7794 evaluation board software should be installed before connecting the AD7794 evaluation board to the PC.
Other components on the AD7794 evaluation board include the ADP3303 high precision, low power, 3.3 V output voltage
regulator, which is used to power the USB/SPI interface.

-Full-featured evaluation board for the AD7794
-Standalone USB interface 
-Various linking options 
-PC software for control of AD7794

Technical Document
http://download.siliconexpert.com/pdfs/2007/03/26/semi_ap/1/adi/instrumentation%20amplifiers/ad7794_7795.pdf