ML145162
LANSDALE Semiconductor, Inc.
OSCin
OSCout
MAXIMUM
CRYSTAL FREQUENCY
16.0 MHz
REF FREQUENCY
COUNTER IDENTIFIER = 0
12–BIT PROGRAMMABLE
REFERENCE COUNTER
14–BIT PROGRAMMABLE
AUXILIARY REFERENCE
COUNTER
A
fR1
B
4
C
25
fR2
D
1
Tx
PHASE
DETECTOR
0 Tx–0
SELECT
TxPDout
LD
1
Rx
PHASE
DETECTOR
0 Rx–0
SELECT
RxPDout
REFERENCE
FREQUENCY
SELECT
REFERENCE
FREQUENCY
COUNTER
REFERENCE
FREQUENCY
SELECT
AUXILIARY REFERENCE
FREQUENCY COUNTER
AUX
Din
0
REF
Tx–0
Rx–0
ENABLE SELECT SELECT
12–BITS REF FREQ
DATA
fR1
S1
fR1
S2
14–BITS AUX REF FREQ
DATA
CLK
ENB
NOTE: ENB must be high during the serial transfer.
Figure 16. Reference Frequency Counter/Selection Programming Mode
Table 4. Bit Function and the Reference Frequency Selection Bit Setting of the
Reference Frequency Counter Programming Word
AUX REF
Enable
0
Auxiliary Reference Frequency
Counter Mode
14–Bit Auxiliary Reference Frequency
Counter Disable
Module
fR1
Select
S1
fR2 → C
0
0
1
1
fR1
S2
fR1 Routing
0
N/A
1
fR1 → A
0
fR1 → B
1
N/A
1
14–Bit Auxiliary Reference Frequency
fR2 → D
0
0
N/A
Counter Enable
0
1
fR1 → A
1
0
fR1 → B
1
1
fR1 → C
N/A = Not Applicable
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