LC72147V Ver la hoja de datos (PDF) - SANYO -> Panasonic

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LC72147V

PLL Frequency Synthesizer for Electronic Tuning in Car Audio Systems

SANYO -> Panasonic 

Continued from preceding page.

Pin No. Symbol

Usage

LC72147V

Function

Pin circuit

• General-purpose I/O ports.

11

I/O-4

• The outputs are complementary output circuits.

13

I/O-5

General-purpose I/O ports • After the power-on reset, these ports function as input ports.

• The input/output state of these ports can be set using the I/O-4 and

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

18

ADC0

19

ADC1

A/D converter input

• A/D converter input

The A/D converter is a 6-bit successive-approximation circuit.

See the item on the structure of the A/D converter for details.

7

PD

15

HCTR

3

XBUF

Charge pump output

• PLL charge pump output

When the frequency created by dividing the local oscillator signal

frequency by N is higher than the reference frequency, a high level is

output from the PD pin. When lower, a low level is output. The PD pin

goes to the high-impedance state when the frequencies match.

General-purpose counter

• HCTR is selected by setting CTS in the control data to 1.

Input frequency: 0.4 to 25 MHz

The signal is input to a divide-by-2 circuit and the result is input to a

general-purpose counter. This counter can also be used as an

integrating counter.

The counter value is output as the result of the count, MSB first, from

the DO pin.

See the item describing the structure of the general-purpose counter

for details.

Crystal oscillator buffer

• Output buffer for the crystal oscillator circuit

• When XB in the serial data is set to 1, the output buffer operates and

the crystal oscillator signal (a pulse signal) is output.

When XB is 0, XBUF outputs a low level.

(After the power-on reset, XB is set to 0 and the output buffer is fixed

at the low level.)

XOUT

No. 6675-6/22

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