PGA4311: [PGA4311] Register setting data request

MJ,

The gain register is programmed through the serial control port, specifically input pins CS, SDI, and SCLK. Control data is provided as a 32-bit word at the SDI pin, with 8 bits for each of the four channels of the PGA4311. Please refer to the "Serial Control Port" section of the PGA4311 datasheet for detailed information on the serial interface protocol and timing requirements.

The gain for each of the four channels is set by it's corresponding 8-bit code [7:0] within the 32-bit control word (see figure 2 below). The conversion from 8-bit binary to gain in dB is as follows:

For N = 1 to 255:

Gain (dB) = 31.5 - [0.5*(255-N)]

where N is the decimal equivalent of the 8-bit code [7:0]

See "Gain Settings" section of the datasheet for more information.