7
• IC Block Diagrams
IC2 TEA1112AT
IC3 HM91510AP
CURRENT
REFERENCE
LOW
VOLTAGE
CIRCUIT
LED
DRIVER
ATT
MICRO
MUTE
AGC
CIRCUIT
16
VCC
1
LN
2
SLPE
3
LED
4
REG
5
GAS
6
MMUTE
7
OTMF
8
MUTE
GAR
QR
VEE
MIC+
MIC-
IR
AGC
15
14
13
12
11
9
10
ROW
INTERFACE CIRCUIT
COLUMN
INTERFACE CIRCUIT
DIVIDER
OSC
KERNEL CONTROL CIRCUIT
INPUT
INTERFACE
CIRCUIT
OUTPUT
INTERFACE
CIRCUIT
ROW/COLUMN
PROGRAMMING
COUNTER
D/A
CONVERTER
DECODER
&
DATA LATCH
PULSE
GENERATOR
LNB
MEMORY
1
C1
2
C2
3
C3
4
C4
VSS
VDD
5
KT
6
OSCI
7
OSCO
8
XMUTE
9
VSS
18
R4
17
R3
16
R2
15
R1
14
MODE
12
13
TONE
10
VDD
11
HKS
PO
MEMORY
VDD
