SM5160DM datasheet(5/7 Pages) NPC

5 / 7 page

NIPPON PRECISION CIRCUITS-5

SM5160CM/DM

Lowpass Filter Connection

An external lowpass filter connects to DOP or DOA.

The output form the filter is fed to a voltage-controlled

oscillator (VCO) which generates the PLL output.

DOP is intended for use with a passive filter as shown

in figure 1. DOA is intended for use with an active filter

as shown in figure 2.

Figure 1. Passive lowpass filter circuit

Figure 2. Active lowpass filter circuit

Programmable Frequency Divider

The input frequency divider and reference frequency

divider ratios can be programmed using the serial data

input.

Input data consists of 16 data bits, in the order msb to

lsb, followed by a control bit, as shown in figure 3 and 4.

SM5160CM

If the control bit is set to 0, the data is written to the

16-bit latch and then passed to the input frequency

divider.

If the control bit is set to 1, the 2 lsbs are ignored and

the remaining data is written to the 14-bit latch and then

passed to the reference frequency divider.

Figure 3. Serial data format (SM5160CM)

SM5160DM

If the control bit is set to 0, the data is written to the

16-bit latch and then passed to the input frequency

divider.

If the control bit is set to 1, the 2 lsbs and 3msbs are

ignored and the remaining data is written to the 11-bit

latch and then passed to the reference frequency divider.

DOP

VCO

VDD

DOA

VDD

VCO

510kΩ

FUNCTIONAL DESCRIPTION

ignored

16BIT (N- COUNTER DATA)

14BIT (R- COUNTER DATA)

1: R-LATCH

0: N-LATCH

ignored

16BIT (N- COUNTER DATA)

11BIT (R- COUNTER DATA)

1: R-LATCH

0: N-LATCH

Figure 4. Serial data format (SM5160DM)

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