Pioneer PDP-501MX Service Manual page 72

PDP-501MX, PDP-V501X
7
TDA8755T
(PROGRESSIVE BLOCK : IC4703)
VIDEO A/D CONVERTER
¶ Pin Assignment
N.C. 1 32 V
CCD
31 D7
REG1 2
INY 30
3 D6
REG2 4 29
D5
CLPY
5 28 D4
V 6 27 D3
CCA
7 26 D2
INU
SDN 8 D1
25
INV
9 24 D0
AGND 10 23 V
CCO
CLPU 22 D'3
11
21 D'2
CLPV
12
20 D'1
13
REG3
CE
14 19 D'0
CLP
15 18 DGND
HREF
16 CLK
17
¶ Pin Function
PIN NO. PIN NAME
1 NC
2 REG1
3 INY
4 REG2
5 CLPY
6 VCC A
7 INU
8 SDN
9 INV
10 AGND
11 CLPU
12 CLPV
13 REG3
14 CE
15 CLP
16 HREF
17 CLK
18 DGND
19 D`0
20 D`1
21 D`2
22 D`3
23 VCC O
24 D0
25 D1
26 D2
27 D3
28 D4
29 D5
30 D6
31 D7
32 VCC D
72
¶ Block Diagram
V CCA V CCD
6
32
SUPPLY AND REFERENCE
3
INY
5
CLPY
CLAMP
CLP 15
LOGIC
INU
7
CLAMP
11
CLPU
U
CLAMP
CLPV 12
V
INV 9
Not connected
Decoupling input (internal stabilization loop decoupling)
Y analog voltage input
Decoupling input (internal stabilization loop decoupling)
Y clamp capacitor connection
Analog positive supply voltage (+5V)
U analog voltage input
Stabilizer decoupling node and analog reference voltage (+3.35 V)
V analog voltage input
Analog ground
U clamp capacitor connection
V clamp capacitor connection
Decoupling input (internal stabilization loop decoupling)
Chip enable input(TTL level input active LOW)
Clamp control input
Horizontal reference signal
Clock input
Digital ground
V data output; bit 0(n-1)
V data output; bit 1(n)
U data output; bit 0(n-1)
U data output; bit 1(n)
Positive supply voltage for output stages (+5V)
Y data output; blt 0(LSB)
Y data output; blt 1
Y data output; blt 2
Y data output; blt 3
Y data output; blt 4
Y data output; blt 5
Y data output; blt 6
Y data output; blt 7(MSB)
Digital positive supply voltage (+5V)
V CCO AGND DGND SDN N.C.
8
23 10 18 1
VOLTAGE REGULATOR
TRACK
AND
CLAMP
HOLD
Y
COMPARATOR
16
TRACK
AND
HOLD
TRACK
DIGITAL ANALOG
AND
MULTIPLEXER MULTIPLEXER
HOLD
TRACK
COMPARATOR
AND
128
HOLD
PIN FUNCTION
REG1 REG2 REG3
2 4
13
8
24
D0
8 8
TTL
8-bit
8-bit
I / O
ADC
PIPELINE
8
31
D7
16
HREF
TIMING GENERATOR 14
CE
17 CLK
2
19 D'0
2
U AND V
20
8 D'1
8-bit TTL
DATA 2
I / O
ADC
21 D'2
ENCODER
2
22
D'3
TDA8755
Y
V
U