Dear Sir
I have some problems about using AD7768. I use an ARM device to configure AD7768(SPI0 port) and receive DOUT data of AD7668(SPI1 port).I can use SPI0 PORT to configure AD7768 ,but I can’t receive DOUT data of AD7668 through SPI1 port.
For…
Hi Michael,
Here is a branch with a fix for ad7768-1: https://github.com/analogdevicesinc/hdl/tree/ad7768_zed_drdy_to_gpio
and the devicetree: https://github.com/analogdevicesinc/linux/blob/29f00886002a3c0756789f5ede3f901f53eadaaf/arch/arm/boot/dts/zynq…
Hello,
I already asked this quiestion in the Precision ADC group, but they gave me the hint to try it here in parallel.(https://ez.analog.com/data_converters/precision_adcs/f/q-a/121547/pga-for-ad7768-1/367471#367471)
I have to measure +/-10V single ended…
Hi,
The formula in the datasheet is incorrect. The correct formula is:
where:
FMAX is the maximum usable frequency.
T11 and T4 are the AD7768/AD7768-4 timing specifications (see Table 3 and Table 5 of the datasheet).
TP is the maximum propagation…
The AD7768/AD7768-4 outputs data as a master, meaning that the device continuously streams data and it is the user's task to read the data as it is output. Therefore the microcontroller that interfaces to the data output lines must be configured as…
I can recommend to you the two ADCs. The AD7616 and AD7768. They have different architecture, the AD7616 is a SAR and AD7768 is a Sigma Delta. The AD7616 is a 16bit , 16 channel dual simultaneous sampling ADC and has a throughput rate of 1MSPS. The…
There are many amplifiers suitable to drive the AD7768/AD7768-4. Choosing the most suitable amp can be a difficult task, especially when there are constraints on the system power. In order to achieve the lowest power and highest accuracy in a data acquisition…
JClay
Only the AD7768-1 device has the option to program the filter coefficients, and this is most likely the filter model you are referring to. However, this model does not apply to the AD7768 or AD7768-4 devices.
The AD7768 and AD7768-4 do not allow…
There is an IBIS model for the AD7768 that can be downloaded at the following link:
AD7768 Tools
The two should have a common ground. The VCOM on the AD7768 is an common mode output from the AD7768 and the default value is 2.5V. This can be use to bias the input to the AD7768. But based from your schematic, you have used the AD7768 referenc…