LC7219M 데이터 시트보기 (PDF) - SANYO -> Panasonic

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LC7219M

PLL Frequency Synthesizers

SANYO -> Panasonic 

LC7219, 7219M

Serial Bus Data Transfer

The LC7219 and LC7219M can both transfer data in

three different modes-36-bit input data transfer, 24-bit

input data transfer and 28-bit output data transfer. The

transfer mode is selected by the four data bits on DI

immediately prior to CE going HIGH as shown in figure

6 and table 4. These bits are synchronized to the clock

and are latched into the mode register on the rising edge

of CE.

Table 4. Mode selection

Mode

36-bit serial data input

A3

A2

A1

A0

0

0

0

1

24-bit serial data input

serial data output

Illegal

Note

× = don’t care

0

0

1

0

0

0

1

1

0

0

0

0

0

1

×

×

1

0

×

×

1

1

×

×

Figure 6. Transfer mode select

Description

All bits of the control data are clocked in on Dl. This mode sould be used

after power-up to initialize the device. It can also be used to modify the

values of bits R0 to R1.

24 bits of the control data are clocked in on Dl. This mode is used to

input the programmable divier ratio bits, the output port bits and the

general-purpose counter enable bit.

Data is output on DO. The data comprises the input data, the general-

purpose counter value and the PLL unlock flags.

Data cannot be transferred.

Programmable Divider

The configurration of the programmable divider is shown in figure 7. Input mode selection is shown in table 5.

Figure 7. Programmable divider

Table 5. Programmable divider selection

DV

SP

Input frequency range (MHz)

1

×

0

1

0

0

10 to 160

2 to 40

0.5 to 10.0

1/2 divider



–

–

1/16 and 1/17

pulse swallower





–

12-bit programmable

divider







Input port

FMIN

AMIN

AMIN

Note

× = don’t care

When an FM signal is input on FMIN, the actual divider

ratio is double the set ratio. For channel steps of 1, 5 and

9 kHz, a 3.6MHz crystal should be used. The program-

mable divider ratio is determined by the setting of the DV

and SP bits as shown in table 6.

Table 6. Divider ratio settings

DV

SP

lsb

Set ratio

1

×

D0

0

1

D0

0

0

D4

256 to 65535

256 to 65535

4 to 4096

Note

× = don’t care

Actual ratio

Twice set ratio

Set ratio

Set ratio

No.3661–7/12

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