LC72136 datasheet(7/23 Pages) SANYO

7 / 23 page

Continued from preceding page.

No. 5038-7/23

LC72136, 72136M

Pin No.

Symbol

(MFP pin numbers

Type

Functions

Circuit configuration

are in parentheses.)

7 (8)

8 (9)

9 (10)

10 (11)

14 (15)

2 (3)

11 (12)

13 (14)

18 (19)

19 (20)

20 (21)

12 (13)

BO1

BO2

BO3

BO4

BO5

BOF

IO1

IO2

AIN

AOUT

IFIN

Output ports

Input or output

ports

Charge pump

output

LPF amplifier

transistor

connections

IF counter

• Dedicated outputs

• The output states are determined by the BO1 to BO5

bits in the serial data.

Data: 0 = open, 1= low

• 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 BO5).

• The output state of the BOF pin is determined by the

serial data DVS bit. Thus this pin can be used as an FM

band selection switch. (Note that it should not be used

as an AM band selection switch since it is susceptible to

noise from the crystal oscillator.)

DVS data: 0 = open, 1 = low

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

power on reset.

• I/O dual-use pins

• The direction (input or output) is determined by bits IOC1

and 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

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 IO1 and IO2

bits in the serial data.

Data: 0 = open, 1 = low

• These pins function as input pins following a power on

reset.

• PLL charge pump output

When the frequency generated by dividing the local

oscillator signal 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.

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

low-pass filter.

• Accepts an input in the frequency range 0.4 to 12 MHz.

• The input signal is directly transmitted to the IF counter.

• The result is output starting the MSB of the IF counter

using the DO pin.

• Four measurement periods are supported: 4, 8, 32, and

64 ms.

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