saa7118 NXP Semiconductors, saa7118 Datasheet - Page 17

• Manufacturer Part Number: saa7118
• Description: Multistandard Video Decoder With Adaptive Comb Filter And Component Video Input
• Manufacturer: NXP Semiconductors

Philips Semiconductors
9397 750 15219
Product data sheet
Fig 6. Analog input processing using the SAA7118 as differential front-end with 9-bit ADC
AI4D
AI3D
AI2D
AI1D
AI44
AI43
AI42
AI41
AI34
AI33
AI32
AI31
AI24
AI23
AI22
AI21
AI14
AI13
AI12
AI11
SOURCE
SOURCE
SOURCE
SOURCE
SWITCH
SWITCH
SWITCH
SWITCH
CONTROL
MODE [ 5:0 ]
8.1.1.1 Clamping
MODE
CVBS/Y
9
The clamp control circuit controls the correct clamping of the analog input signals. The
coupling capacitor is also used to store and filter the clamping voltage. An internal digital
clamp comparator generates the information with respect to clamp-up or clamp-down.
The clamping levels for the four ADC channels are fixed for luminance (120),
chrominance (256) and for component inputs as component Y (32), components P
P
on the back porch of the video signal.
CIRCUIT
CIRCUIT
CIRCUIT
CIRCUIT
CLAMP
CLAMP
CLAMP
CLAMP
R
CONTROL
CLAMP
(256) or components RGB (32). Clamping time in normal use is set with the HCL pulse
CHROMA
9
GLIMB
GLIMT
WIPA
SLTCA
AMPLIFIER
AMPLIFIER
AMPLIFIER
AMPLIFIER
ANALOG
ANALOG
ANALOG
ANALOG
DAC9
DAC9
DAC9
DAC9
CONTROL
HSY
GAIN
HOLDG
GAFIX
WPOFF
GUDL [ 1:0 ]
GAI [ 48:40 ]
GAI [ 38:30 ]
HLNRS
UPTCV
REFA
Rev. 06 — 22 December 2005
ANTI-ALIAS
ANTI-ALIAS
ANTI-ALIAS
ANTI-ALIAS
FILTER
FILTER
FILTER
FILTER
CROSS MULTIPLEXER
ANTI-ALIAS
CONTROL
Multistandard video decoder with adaptive comb filter
ANALOG CONTROL
FUSE [ 1:0 ]
FUSE [ 1:0 ]
FUSE [ 1:0 ]
FUSE [ 1:0 ]
R/R - Y
BYPASS
SWITCH
BYPASS
SWITCH
BYPASS
SWITCH
BYPASS
SWITCH
BLANKING
VERTICAL
CONTROL
VBSL
9
G/Y
9
B/B - Y
9
SELECTOR
AOSL [ 2:0 ]
BUFFER
TEST
ADC4
ADC3
ADC2
ADC1
AND
© Koninklijke Philips Electronics N.V. 2005. All rights reserved.
AD2/4BYP
DF
9
9
DF
AD1/3BYP
9
DOSL [ 1:0 ]
SAA7118
9
SELECTOR
DF
DIGITAL
TEST
9
ADPE
DF
9
mbl758
17 of 170
AOUT
ADP [ 8:0 ]
B
and