CS7622 Datasheet, PDF (25/36 Pages) Cirrus Logic – CCD Imager Analog Processor

CS7622
Fixed Gain
Default = 00h; Read/Write (address 14h)
Bit Number
Bit Name
Default
7
6
RESERVED
0
0
5
4
3
fixed_gain2 fixed_gain1 fixed_gain0
0
0
0
2
1
0
RESERVED
0
0
0
Bit
7:6, 2:0
5:3
Mnemonic
-
fixed_gain2-0
Function
Reserved
Fixed Gain: This is used to turn off the DRX functionality and apply a fixed gain
to the input before reaching the ADC. A setting of 000 is used for normal oper-
ation this will yield the largest dynamic range by switching the front end gain rel-
ative to the amplitude of the input signal. The settings 001, 010, 011, and 100
are for fixed gains of 1x, 2x, 4x, and 8x respectively. Figure 18 shows the trans-
fer function of the output of the ADC for a given input with the various fixed gain
settings.
DS322PP1
25