SAA7108AE Datasheet, PDF (41/208 Pages) NXP Semiconductors – HD-CODEC

NXP Semiconductors
SAA7108AE; SAA7109AE
HD-CODEC
ANALOG INPUT
gain
9
AMPLIFIER
DAC
ANTI-ALIAS FILTER
ADC
9
LUMA/CHROMA DECODER
NO ACTION
1 _VBLK 0
1 _HOLDG 0
1
X
0
1
0
HSY
0 _{> 510} 1
0 _<4 1
1 _<1 0
1 _{> 510} 0
1 _{> 496} 0
X=0
X=1
+1/ F
+1/L −1/LLC2
+1/LLC2 −1/LLC2
+/− 0
STOP
GAIN ACCUMULATOR (18 BITS)
ACTUAL GAIN VALUE 9-BIT (AGV) [−3/+6 dB]
1
X
0
1
0
HSY
1
0
Y
AGV
UPDATE
GAIN VALUE 9-BIT
X = system variable.
Y = AGV − FGV > GUDL.
GUDL = gain update level (adjustable).
VBLK = vertical blanking pulse.
HSY = horizontal sync pulse.
AGV = actual gain value.
FGV = frozen gain value.
Fig 17. Gain flow chart
FGV
mhb728
SAA7108AE_SAA7109AE_3
Product data sheet
Rev. 03 — 6 February 2007
© NXP B.V. 2007. All rights reserved.
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