LC723781N/723782N/723783N/723784/723785

No.8011-10/14

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Pin name

Pin No.

I/O

Pin explanation

Equivalent circuit

FMIN

95

I

FM VCO (local oscillator) input.

This pin is selected with CW1 in the PLL instruction.

The signal input to this pin must be capacitor coupled.

Input is disabled in Backup mode, after a power on reset, and in the

PLL stopped state.

AM VCO (local oscillator) input.

This pin is selected and the band set with CW1 (b1, b0) in the PLL

instruction.

b1

b0

Band

1

0

2 to 40MHz (SW, AM upconversion)

1

1

0.5 to 10MHz (MW, LW)

AMIN

94

I

The signal input to this pin must be capacitor coupled.

Input is disabled in Backup mode, after a power on reset, and in the

PLL stopped state.

Sub-charge pump output and general-purpose input shared function

port.

The IOS2 instruction is used for switching between the sub-charge

pump output and general-purpose input functions.

• When used as the sub-charge pump output :

The sub-charge pump output function is set up with the IOS2

instruction.

A high-speed locking circuit can be formed by using this pin in

conjunction with the main charge pump.

The sub-charge pump is controlled using the DZC instruction.

b3

b2

Operation

0

0

High impedance

0

1

Only operates when the PLL is unlocked

(450kHz)

1

0

Only operates when the PLL is unlocked

(900kHz)

1

1

Normal operation

SUBPD

92

I/O

• When used as a general-purpose input :

The general-purpose input function is set up with the IOS2

instruction.

Data is read from the port using the INR instruction.

This pin goes to the high-impedance state in Backup mode, after a

power on reset, and in the PLL stopped state.

INEO

91

I

Dedicated input port.

Data is read from the port using the INR instruction

Input is disabled in Backup mode.

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