Fostex CR300 Service Manual page 53

BA7082F (SERVO DIGITAL PCB ASSY: IC302, VCO IC)
• Block Diagram
IN1
16
1
SW1
• Pin Function
No. Pin Name I/O
1 SW1
Collector open output
2 SW2 O
Logic block output for control sensitivity
adjustment
3 SW3
4 B W
Logic block input for control sensitivity
I
adjustment
5
BWB
Logic block input for control sensitivity
adjustment and 1/2 frequency demultiplier
6 1/2FB I
switch
demultiplier output
7 FOUT O VCO output pin
8 GND - GND pin
AD1893JST (SERVO DIGITAL PCB ASSY: IC311, Sample Rate Converter IC)
• Block Diagram
IN2 VO VCTL
15 14 13
2 3 4
SW2 SW3 BW
Function
H: through, L: 1/2 frequency
44 43 42 41 40 39 38 37 36 35 34
1
NC
SERIAL IN
2
BCLK_I
3
WCLK_I
4 ACCUM
LR_I
5
NC
6 MULT
V
DO
7
GND
FIFO
8
NC
9
BKPOL_I
10
MODE0_I
CLOCK
TRACKING
11
NC
12 13 14 15 16 17 18 19 20 21 22
CT1 CT2 VCC
12 11 10
VCO
SW
5 6 7
BWB 1/2FB FOUT
No. Pin Name I/O
9 FADJ f0 Adjust pin
-
1 0 VCC pin
VCC -
1 1
CT2
Capacitor connection pin for VCO oscillation
-
1 2
CT1
VCO control pin. Normally, use for short-
1 3 VCTL I
circuit with VO (pin 14).
1 4 V0 O Amp. output for sensitivity adjustment
1 5 IN2
Amp. input for sensitivity adjustment
I
IN1: positive-phase input IN2: Inverting input
1 6
IN1
33
NC
SERIAL OUT
32
WCLK_O
31
LR_O
30
DATA_O
29
NC
28
V
DO
27
GND
COEF ROM
26
NC
25
BKPOL_O
24
MODE0_O
23
NC
F
ADJ
9
1/2
8
GND
Function
CR300
53