AFE for ILX 511

Hi,

Both the VSP2582 and the VSP2566 will work in this application. The differences are in the number of output bits you want to have and the system design. Both devices have 16bit internal ADCs.

The VSP2582 will output 12 bits. If the SONY ILX is noise is greater than Max Output Voltage/2^12 = MaxOutput Voltage/4096. The advantage of the 12-bit output is fewer bits to deal with in terms of layout, slightly less power consumption and requires four fewer input pins on the processor to interface. Depending on the digital processing to follow, this may be more susceptible to integer arithmetic errors because of the reduced bit count.

The VSP2562 will output 16 bits. If the SONY sensor noise is less than the above criterion then this is a better choice. Additionally, The VSP2566 has two integrated DACs which can be useful if your system requires adjustment of biases or other functions. The DACs can be programmed over the same Serial Interface used to program the rest of the device.

As you can see, ultimately the choice is determined by the sensor noise. Sensor noise will depend on inherent circuit design but also operating conditions such as exposure time and temperature, so there is o simple answer. Best is to measure the sensor noise under the operating conditions you expect to be using.

In the absence of hard sensor noise data, I would go with the VSP2562. It would provide a design margin in the case the sensor noise is lower or if extensive digital processing is envisioned.

Regards,

Werner