AFE FOR CCD/CIS SIGNAL PROCESSOR
BL8531H
MAIN BLOCK DESCRIPTION
1) Programmable Gain Amplifier
The analog programmable gain can accommodate a wide range of input voltage spans. The transfer function
of the PGA is as follows.
H(X) = 1/6*X + 5/6,
where the range of X is 0 to 31.
Thus, the minimum gain value is equal to 5/6, and the maximum gain value is equal to 6. The transfer function
has linearity in linear scale. The overall gain is equal to analog gain multiplied by digital gain. So, the
multiplier should be required in back end of AFE.
16
14
12
10
8
6
5
4
3
2
1
0
6
4
2
0
-2
PGA Gain Setting
There is a gain boosting block before 12-bit ADC, which can muliply PGA's output signal by 1.5 (3.5dB) or pass it.
This is controled by gain mode of configuration register.
14
SAMSUNG [ SAMSUNG ]
