I'm using an AD7682 and want to monitor the device temperature. This is available via the inbuilt temperature sensor, but whilst I can read the raw binary value ok, the datasheet does not explain the transfer function. How do I convert the binary to Degrees…

I'm designing SPI interfaces to control multiple AD7682 devices on a board, each with different analog input configurations and reference connections.  The intent is to hide the complexity of the SPI interface from software by continuously accessing…

Hi,
   I am using AD7682 to make a data aquisition system.
   I connected the COM(pin10) to GND and used the internal reference 2.5V.
   But when the amplitude of the input sinewave exceed about 1.2V, half of the reference voltage, it seemed that the waveform…

Background/Use case:

4 analog sensors

• - AC output range of ~+/- 0.5Vpk-pk
• - DC offset of 1.65V
• - Output impedance ~ 32kΩ +/- 8kΩ
• - Output drives ADA4841-x buffers, which drive ADC inputs CH1-4
• - sampled at 800 Sa/s
• - 4 Sensor star grounds…

Hi there,

I'm using the four-channel AD7682 in the following mode:

Internal reference and temperature sensor enabled. REF = 4.096 V buffered output.

Unipolar, INx referenced to GND

I'm having trouble interpreting the SPI example waveforms of Fig.…

Hi,

ADC AD7682 have digital SPI connection but no digital grounding specified in the package.

As per datasheet " At least one ground plane should be used. It can be common or split between the digital and analog sections. In the latter case, the planes…

Here is the starting point of our circuit:

For AD7682, we need to use an external reference voltage as we have a non-standard voltage (~1V).  So we would like to use an op-amp to drive the AD7682’s reference. It appears – if I read correctly, that there…

Hi all

In datasheet of AD7682, Cin/Rin are written as 27pF/2.2kOhm (typ.).

1. How much is Cin/Rin variation?

2. Can it prescribe as Max/Min?

Thanks!

Hi there,

I'm trying to use an AD7682 to sample a differential sensor signal and am seeing some strange results. If I sample IN0 and IN1 separately as single-ended inputs and subtract the two, I get a nice clean signal. If I try using the bipolar differential…

Question 1:

The AD7682 datasheet describes that there is a pin called COM which can connect to 0V or VREF/2V. But in which case we should connect the COM pin to the 0V and in which case connect to VREF/2V? What's the main function of the COM pin?…