LC72146V View Datasheet(PDF) - SANYO -> Panasonic

Part Name

Description

Manufacturer

LC72146V

PLL Frequency Synthesizer for Electronic Tuning

SANYO -> Panasonic 

Continued from preceding page.

Number

Symbol

LC72146, 72146M, 72146V

Type

Function

• General-purpose I/O ports

• Output mode circuit type: complementary

9

I/O-4

General-purpose • Function after a power on reset: input port

8

I/O-5

I/O port

• Can be set up to function as output ports by bits I/O-4

and I/O-5 in the serial data sent from the controller.

Equivalent circuit

7

O-6

Output port

• The LC72146 latches the OUT6 bit in the serial data and

outputs it from pin O-6.

• The LC72146 latches the OUT7 bit in the serial data and

outputs it from pin O-7.

6

O-7

Output port • Outputs a time base signal (8 Hz) when TBC is set to 1.

• Function after a power on reset: open circuit

• PLL charge pump output pin

If the frequency generated by dividing the local oscillator

20

19

frequency by N is higher than the reference frequency, a

PD0

Charge pump

high level will be output from PD0, and if it is lower, a low

PD1

output

level will be output. PD0 goes to the high-impedance

state when the frequencies match.

• PD1 operates identically.

• Connections to the n-channel MOS transistor used for

the PLL active low-pass filter.

21

22

AIN

AOUT

Connections for the

low-pass filter

•

A high-speed locking circuit can be formed by using

these pins with the built-in sub charge pump.

transistor

• See the item on the structure of the charge pump for

details.

• HCTR is selected when CTS1 is set to 1.

• Input frequency range: 0.4 to 25 MHz

• The signal is passed through a divide-by-two circuit and

then input to a general-purpose counter. This input also

supports an integrating count function.

14

HCTR/I-6

General-purpose • The result is output from the DO output pin starting with

counter

the MSB of the general-purpose counter.

• See the item on the structure of the general-purpose

counter for details.

• When the H/I-6 bit in the serial data is set to 0:

• This pin functions as an input port, and the value input is

output from the DO pin.

Continued on next page.

No. 4922-7/22

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