NAD T 751 - Tuner Board IC Block Diagrams; LC72723 M, LC7218 Block Diagrams

46
TUNER BOARD
U902: LC72723M
TUNER BOARD
U903: LC7218
Vdda
3
REFERENCE
VOLTAGE
ANTIALIASING
FILTER
DATA
DECODER
V
REF
1
V
REF
FLOUT
5
CIN
6
PLL
(57kHz)
CLOCK
RECOVERY
(1187.5Hz)
+
_
Vddd
11
Vssd
10
RDDA
14
RDCL
15
MODE
12
RST
13
RDS-ID/READY
16
Vssa
4
MPXIN
2
TEST
7
TEST
57kHz
BPF
(SCF)
SMOOTHING
FILTER
OSC
CLK(4.332MHz)
9
X
IN
8
X
OUT
RDS-ID
DETECT
RAM
(128bits)
21
22
16
15
20
23
871714131211109
5
4
3
2
18
19
24
1
6
XIN
FMIN
AMIN
CE
DI
CL
D0
OUT0 OUT1
XOUT
PHASE DETECTOR
CHARGE PUMP
REFERENCE
DIVIDER
SWALLOW COUNTER
1/16, 1/17 4 BIT
SHIFT REGISTER
LATCH
UNIVERSAL
COUNTER
1
2
12-BIT PROGRAMMABLE
DIVIDER
SYC
OUT2 OUT3 OUT4 OUT5 OUT6 IN0 IN1
V
SS
V
DD
LCTR
HCTR
PD2
PD1