hmp8117 Intersil Corporation, hmp8117 Datasheet - Page 3

• Manufacturer Part Number: hmp8117
• Description: Ntsc/pal Video Decoder
• Manufacturer: Intersil Corporation

Analog Front End Block Diagram
CHROMA INPUT
VID1
VID2
Y_IN
C_IN
5
75
PIN #
75
6
9
VIDEO
INPUT
75 75
1.0μF
19
17
STORAGE
7
8
STORAGE
CAP
CAP
CVBSX. SIZE = INPUT. SYNC TIP CLAMPED AT ~= 1.75 VDC.
Y
A/D_TEST. SIZE ~= F(LUMA AGC), PORCH OFFSET ~= 2.0VDC.
C. SIZE = INPUT SIZE. PORCH OFFSET ~= 2.0 VDC.
(EXTERNAL)
ANTI-ALIAS
OUT
EXTERNAL
1.0μF
1.0μF
1.0μF
FILTER
NOMINAL (NTSC) OPERATING CONDITION
75
/Y
1.0μF
IN
CVBS3(Y)
. SIZE = ~1.0 V
CVBS1
CVBS2
0.1μF
PIN
0.1μF
LCAP
CCAP
#
(INTERNAL CLAMP)
nmos
C
VAA
76
19
29
7
6
5
# DECODER PIN #
50μA
P-P
, SYNC TIP OFFSET ~= 1.5 VDC.
(SIGNAL BIAS ~ 2.0V)
+
(OFFSET CHROMA SIGNAL TO ADC MID-SCALE ~= 2.0V)
-
CLAMP
CLAMP
CLAMP
1.75V
(OFFSET LUMA SIGNAL TO LOWER ADC REF ~= 1.5V)
1.75V
REF
TO
MUX
SELECT
MUX
M
U
X
CHROMA
(BELOW)
ATTEN
ATTENUATOR
ATTENUATOR
VARIABLE
VARIABLE
CHROMA
13-STEP
13-STEP
ATTEN
1.75V
2.0V
13
PIN #
DECODER
4 TO 13
76
29
28
78
2X
2X
NOMINAL (NTSC) OPERATING CONDITION
LCAP. DC-SIGNAL OFFSET ~= 2.4 VDC.
CCAP. DC-SIGNAL OFFSET ~= 2.4 VDC.
RSET. DC-SIGNAL OFFSET ~= 1.2 VDC.
REF_CAP. DC-SIGNAL OFFSET ~= 2.5 VDC.
Y
OUT
9
CHROMA MULT.
(BELOW)
ANTI-ALIAS
EXTERNAL
A/D_TEST
CHARGE PUMP
100μA
CHARGE PUMP
100μA
100μA
100μA
FILTER
17
11
4
Y
8
IN
GAIN CONTROL
FINE ADJUST MULT. FACTOR
CORRECTION
DISCHARGE
DISCHARGE
SYNC-TIP ENABLE
SYNC-TIP ENABLE
SET POINT
BUF
BUF
CHARGE
CHARGE
LOGIC
GAIN
10-BIT
10-BIT
DC-RESTORE
DC-RESTORE
ADC
ADC
2.5V
2.5V
1.5V
1.5V
CHROMA
LOGIC
LOGIC
LUMA
10
10
BACKPORCH
(REMOVE Fsc)
LOW-PASS
DISABLE
DISABLE
ENABLE
DIGITAL
DIGITAL
FILTER
FILTER
FILTER
ALIAS
ALIAS
ANTI-
ANTI-
REFERENCE
INTERNAL
BIAS/
CHROMA
MULT.
28
78
POWERDOWN
RSET
REF_CAP
1.0μF
C[7:0]
Y[7:0]