sm5170 Nippon Precision Circuits Inc, (NPC), sm5170 Datasheet - Page 8

• Manufacturer Part Number: sm5170
• Description: Pll Synthesizer Ic
• Manufacturer: Nippon Precision Circuits Inc, (NPC)

Bits 15 to 19, bits 21 to 22
Bits 15 to 19 have no meaning, and should be set to 0. Bits 21 and 22 are factory test bits and should also be set
to 0.
Input data format example
Reference frequency divider = 144, LD normal operation:
Standby Mode
The SM5170AV enters standby mode when OPR goes LOW. In this mode, the states and functions shown in
the table occur.
In standby mode, some current flows into VDD1. Therefore, it is necessary to reduce V
reduce current consumption and reduce power dissipation. Note that if both the V
reduced to 0V, the latch contents will be erased. In this case, V
mode is released when V
Phase Comparator Timing Diagram
The DO output circuit polarity is configured for connection to an external passive filter. The signals compared
are FV and FR, which are the internal FIN input frequency divider output signal and reference frequency
divider output signal, respectively.
DO and DB
LD
Phase comparator
Input FIN
Input XIN
N counter
R counter
Latch data
Block
MSB
1
2
15
Floating (high impedance)
LOW-level output
Reset
Feedback resistor is cutoff (HIGH level)
Feedback resistor is cutoff (HIGH level)
Reset
Reset
Stored (while V
2
2
DO
LD
FV
14
FR
3
2
Reference Counter (16bit : 5 to 65535)
Figure 6. Reference counter data and LD output setting example
13
DD1
4
2
12
DD2
5
2
rises and OPR goes HIGH.
11
Control bits
is within rating)
State
6
2
10
7
2
Test bits (set to 00)
9
Figure 7. Phase comparator timing
8
2
8
9
2
7
LDpin Set bit
10
2
6
11
SM5170AV
2
5
12
2
4
13
Not used (set to 000)
2
3
14
2
2
15
2
1
DD1
16
2
0
17
only should be reduced to 0V. Standby
18
19
20
SEIKO NPC CORPORATION —8
DD1
21
22
and V
23
DD1
LSB
24
DD2
to 0V to fully
supplies are