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WM8224 датащи(PDF) 22 Page - Wolfson Microelectronics plc

номер детали WM8224
подробное описание детали  60MSPS 3-Channel AFE with Multiple Device Operation and Programmable Automatic Black Level Calibration
PDF  50 Pages
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производитель  WOLFSON [Wolfson Microelectronics plc]
домашняя страница  http://www.wolfsonmicro.com
Logo WOLFSON - Wolfson Microelectronics plc

WM8224 датащи(HTML) 22 Page - Wolfson Microelectronics plc

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WM8224
Production Data
w
PD, Rev 4.1, June 2012
22
0
1
2
3
4
5
6
7
8
0
128
256
384
512
Gain Code (PGA[8:0])
0
0.5
1
1.5
2
2.5
3
3.5
0
128
256
384
512
Gain Code (PGA[8:0])
Max i/p Voltage
LOWREFS=0
Max i/p Voltage
LOWREFS=1
Figure 17 PGA Gain Characteristic
Figure 18 Peak Input Voltage to Match ADC Full-scale Range
ADC INPUT BLACK LEVEL ADJUST
The output from the PGA can be offset to match the full-scale range of the differential ADC (2*[VRT-
VRB]).
For negative-going input video signals, a black level (zero differential) output from the PGA should be
offset to the top of the ADC range by setting register bits PGAFS[1:0]=10. This will give an output
code of FFFF (hex) from the WM8224 for zero input. If code zero is required for zero differential input
then the INVOP bit should be set.
For positive going input signals the black level should be offset to the bottom of the ADC range by
setting PGAFS[1:0]=11. This will give an output code of 0000 (hex) from the WM8224 for zero input.
Bipolar input video is accommodated by setting PGAFS[1:0]=00 or PGAFS[1:0]=01. Zero differential
input voltage gives mid-range ADC output, 7FFF (hex).



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