SAA7118H NXP Semiconductors, SAA7118H Datasheet - Page 18
SAA7118H
Manufacturer Part Number
SAA7118H
Description
Manufacturer
NXP Semiconductors
Datasheet
1.SAA7118H.pdf
(177 pages)
Specifications of SAA7118H
Adc/dac Resolution
9b
Screening Level
Commercial
Package Type
PQFP
Pin Count
160
Lead Free Status / RoHS Status
Compliant
Available stocks
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Price
Part Number:
SAA7118H
Manufacturer:
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Part Number:
SAA7118H/V1
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Part Number:
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Sigma Designs Inc
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NXP Semiconductors
SAA7118_7
Product data sheet
8.1.1.2 Gain control
The gain control circuit receives (via the I
amplifiers or controls one of these amplifiers automatically via a built-in Automatic Gain
Control (AGC) as part of the Analog Input COntrol (AICO).
The AGC for luminance is used to amplify a CVBS or Y signal to the required signal
amplitude, matched to the ADCs input voltage range. Component inputs are gain adjusted
manually at a fixed gain. The AGC active time is the sync bottom of the video signal.
Signal (white) peak control limits the gain at signal overshoots. The flow charts
(see
voltage variation within the specified range is automatically eliminated by clamp and
automatic gain control.
Fig 7.
Fig 8.
Figure 9
Analog line with clamp (HCL) and gain range (HSY)
Automatic gain range
and
Figure
(1 V (p-p) 18/56 )
Rev. 07 — 7 July 2008
10) show more details of the AGC. The influence of supply
511
120
1
Multistandard video decoder with adaptive comb filter
analog input level
0 dB
3 dB
6 dB
analog line blanking
maximum
minimum
GAIN
HSY
2
range 9 dB
C-bus) the static gain levels for the four analog
CLAMP
TV line
HCL
ADC input level
mhb325
controlled
mhb726
0 dB
SAA7118
© NXP B.V. 2008. All rights reserved.
18 of 177
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