sm5160c Nippon Precision Circuits Inc, (NPC), sm5160c Datasheet - Page 5

• Manufacturer Part Number: sm5160c
• Description: Programable Pll Frequency Synthesizer
• Manufacturer: Nippon Precision Circuits Inc, (NPC)

Lowpass Filter Connection
FUNCTIONAL DESCRIPTION
The output form the filter is fed to a voltage-controlled
oscillator (VCO) which generates the PLL output.
in figure 1. DOA is intended for use with an active filter
as shown in figure 2.
DOA
An external lowpass filter connects to DOP or DOA.
DOP is intended for use with a passive filter as shown
DOP
Figure 1. Passive lowpass filter circuit
Figure 2. Active lowpass filter circuit
R1
R1
510k
R2
V
R2
C
DD
C
V
VCO
DD
R
L
SM5160CM/DM
VCO
Programmable Frequency Divider
divider ratios can be programmed using the serial data
input.
lsb, followed by a control bit, as shown in figure 3 and 4.
SM5160CM
16-bit latch and then passed to the input frequency
divider.
the remaining data is written to the 14-bit latch and then
passed to the reference frequency divider.
SM5160DM
16-bit latch and then passed to the input frequency
divider.
ignored and the remaining data is written to the 11-bit
latch and then passed to the reference frequency divider.
The input frequency divider and reference frequency
Input data consists of 16 data bits, in the order msb to
If the control bit is set to 0, the data is written to the
If the control bit is set to 1, the 2 lsbs are ignored and
If the control bit is set to 0, the data is written to the
If the control bit is set to 1, the 2 lsbs and 3msbs are
Figure 3. Serial data format (SM5160CM)
ignored
ignored
Figure 4. Serial data format (SM5160DM)
1: R-LATCH
1: R-LATCH
11BIT (R- COUNTER DATA)
16BIT (N- COUNTER DATA)
16BIT (N- COUNTER DATA)
NIPPON PRECISION CIRCUITS-5
14BIT (R- COUNTER DATA)
0: N-LATCH
0: N-LATCH
ignored