Onkyo TX-NR901 Service Manual page 72

IC BLOCK DIAGRAMS AND DESCRIPTIONS
Q160 TC9246F(PLL IC for Digital Audio)
V LOCK
DD
16 15
LOCK DETECTION
CIRCUIT
VAR
REF
1 2
REF P
D
No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
S2 S1
14 13
MICROPROCESSOR INTERFACE
PROGRAMMABLE COUNTER
3 4
V AMPI
DDA
Symbol I/O Function Description
REF I Reference signal input pin
PD O Phase error signal output pin
VDDA - Analog power supply
AMPI I Amplifier input pin for LPF or Oscillator 1
AMPO O Amplifier output pin for LPF or oscillator 1
VSSA - Analog ground pin
XI I Amplifier input pin for oscillator 3
XO O Output pin for oscillator 3
VSS - Digital ground pin
CKO O Oscillator clock output
M1 I Mode select pin
M2 I Mode select pin
S1 I Parallel mode: Divided ratio select pin
Serial mode: Data input pin from microprocessor
S2 I Parallel mode: Divided ratio select pin
Serial mode: Shift clock input pin
LOCK O Lock detect signal output pin
VDD - Digital power supply
M2 M1
12
11
VCO
5 6
AMPO A
SSA
TX-NR901
CKO Vss
10 9
7 8
XI XO