LC72135M データシートの表示（PDF） - SANYO -> Panasonic

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LC72135M

PLL Frequency Synthesizer for Electronic Tuning

SANYO -> Panasonic 

Continued from preceding page.

Symbol

VSS

Pin No.

19

Type

Ground

BO1

BO2

BO3

BO4

6

7

8

Output port

9

LC72135M

Functions

• The LC72135M ground

• Dedicated output pins

• The output states are determined by BO1 to BO4 bits in

the serial data.

Data: 0 = open, 1 = low

• All output ports are set to the open state following a

power-on reset.

• A time base signal (8 Hz) can be output from the BO1

pin. (When the serial data TBC bit is set to 1.)

• Care is required when using the BO1 pin, since it has a

higher on impedance that the other output ports (pins

BO2 to BO4).

Circuit configuration

—

• I/O dual-use pins

• The direction (input or output) is determined by bit IOC2

in the serial data.

Data: 0 = input port, 1 = output port

• When specified for use as input ports:

The state of the input pin is transmitted to the controller

IO2

12

I/O port

over the DO pin.

Input state: low = 0 data value

high = 1 data value

• When specified for use as output ports:

The output states are determined by the IO2 bit in the

serial data.

Data: 0 = open, 1 = low

• The pin function as input pin following a power-on reset.

• PLL charge pump output

When the frequency generated by dividing the local

PD

16

Charge pump

output

oscillator frequency by N is higher than the reference

frequency, a high level is output from the PD pin.

Similarly, when that frequency is lower, a low level is

output. The PD pin goes to the high-impedance state

when the frequencies match.

AIN

AOUT

17

LPF amplifier

• The n-channel MOS transistor used for the PLL active

18

transistor

low-pass filter.

Continued on next page.

No. 5157-7/24

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