JVC TH-A5 Service Manual page 15

Description of major ICs
BA5983FM (U6) : 4CH driver
1.Block diagram
27
28 26
Vcc
1
2
3
2.Pin function
Symbol
I/O
Pin No.
1
I
BLAS IN
2
OPIN1(+) I
3
OPIN1(-) I
4
O
OPOUT1
5
OPIN2(+) I
6
I
OPIN2(-)
7
O
OPOUT2
8
GND -
9
I
STBY1
10
-
PowVcc1
11
VO2(-) O
12
O
VO2(+)
13
VO1(-) O
14
VO1(+) O
74VHC574 (DIC16, DIC17) : Flip flop
1. Pin layout
OE 1 20 Vcc
D0 2 19 O0
D1 3 18 O1
D2 4 17 O2
D3 5 16 O3
D4 6 15 O4
D5 7 14 O5
D6 8 13 O6
D7 9 12 O7
GND 10 11 CP
25 24 23 22
10k
10k
20k
10k
10k
10k
4 5 6
7
Function
Input for Bias-amplifier
Non inverting input for CH1 OP-AMP
Inverting input for CH1 OP-AMP
Output for CH1 OP-AMP
Non inverting input for CH2 OP-AMP
Inverting input for CH2 OP-AMP
Output for CH2 OP-AMP
Substrate ground
Input for CH1/2/3 stand by control
Vcc for CH1/2 power block
Inverted output of CH2
Non inverted output of CH2
Inverted output of CH1
Non inverted output of CH1
2. Pin function
Symbol Function
D0-D7 Data Inputs
CP Clock Pulse Input
OE 3-STATE Output Enable Input
O0-O7 3-STATE Outputs
21 20 19
Vcc
10k
STAND BY
CH4
20k
10k
STAND BY
CH1/2/3
Vcc
8 9 10
Symbol
I/O
Pin No.
VO4(+) O
15
VO4(-) O
16
VO3(+) O
17
VO3(-) O
18
PowVcc2 -
19
STBY2 I
20
GND -
21
OPOUT3 O
22
OPIN3(-) I
23
OPIN3(+) I
24
OPOUT4 O
25
OPIN4(-) I
26
OPIN4(+) I
27
PreVcc -
28
3. Truth table
Dn
H
L
X
H:HIGH Voltage Level
L:LOW Voltage Level
X:Immaterial
Z:High Impedance
:HIGH to LOW transition
18 17 16 15
10k 10k
10k
10k
10k
10k
Level Shift
Level Shift
Level Shift
Level Shift
10k
10k
10k
10k
10k
10k 10k 10k
12
11 13
14
Function
Non inverted output of CH4
Inverted output of CH4
Non inverted output of CH3
Inverted output of CH3
Vcc for CH3/4 power block
Input for Ch4 stand by control
Substrate ground
Output for CH3 OP-AMP
Inverting input for CH3 OP-AMP
Non inverting input for CH3 OP-AMP
Output for CH4 OP-AMP
Inverting input for CH4 OP-AMP
Non inverting input for CH4 OP-AMP
Vcc for pre block
Inputs Outputs
CP OE On
L H
L L
X H Z
TH-A5
10k
1-15