Preliminary Programmable Gain Amplifier (PGA) The PGA provides gains from 0dB to 36 dB in approximately 0.047 dB steps. " />
參數(shù)資料
型號: XRD98L62EVAL
廠商: Exar Corporation
文件頁數(shù): 10/37頁
文件大?。?/td> 0K
描述: EVAL BOARD XRD98L62
標準包裝: 1
系列: *
XRD98L62
18
Rev. P2.00
Preliminary
Programmable Gain Amplifier (PGA)
The PGA provides gains from 0dB to 36 dB in approximately 0.047 dB steps. The desired gain setting is
programmed via the 10 bit gain register in the Serial Interface.
For gain codes between 0 and 767 the gain can be calculated by the following equation:
×
=
36
768
]
[
Code
dB
Gain
For gain codes
≥ 768 the gain is fixed at 36 dB. The gain doubles every 128 codes to simplify DSP algorithms and
control.
Gain Code, PGA[9:0]
PGA
Gain
[dB]
0
1024
512
256
0
6
768
12
18
24
30
36
27
9
192
568
Figure 6. PGA Gain vs. Gain Code
An example of setting the gain is as follows: If the CCD input is limited by 800mVpp (CDSVIN) and the ADC full
scale differential input (VID) is 2Vpp, then a minimum gain is calculated by:
=
CDSV
IN
VID
Gain
20 log
=
0.8
2
20 log
= 8dB
The gain code would be set to 170d for 8dB of PGA gain.
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