NAD T 751 Service Manual page 36

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