TA2022AFNG Ver la hoja de datos (PDF) - Toshiba

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Fabricante

TA2022AFNG

TOSHIBA Bipolar Linear Integrated Circuit Silicon Monolithic

Toshiba 

TA2022AFNG

Application Note

1. Power switch

It is necessary to connect an external pull−down resistor with the terminal of PW SW (pin (23)), in case that this

IC is turned on due to external noise etc.

2. Mode switch

The terminal of AM / FM changeover is pin(19).

In controlling the AM / FM mode with voltage, it is applied as follows.

VCC : AM mode

OPEN: FM mode

In FM mode, care should be taken to eliminate influence due to external noise etc, because this terminal is

opened.

The leak current flows through this terminal, in the case that the terminal is connected to VCC line

independently, even through this IC is off mode (the terminal of PW SW (pin(23)) is off mode).

3. IF count output

IF count signal can be taken from IF output terminal (pin(10)), when IF request terminal (pin(11)) is connected

with GND through RSEN and stop pulse sensitivity is on.

Switch Condition

Pin(11)

Pin(19)

FM

OPEN

OPEN

AM

(RSEN ≤ 100kΩ)

VCC

Output

Frequency

10.7MHz

450kHz

Output

Voltage (typ.)

80mVp−p

100mVp−p

Output

Impedance (typ.)

2 kΩ

Table.1 IF count output

4. FM stop pulse sensitivity

FM stop pulse sensitivity can be changed by

connecting an external resistor RSEN

between IF request terminal (pin(11)) and

GND. The gain of FM IF amplifier is

controlled by RSEN, and FM stop pulse

sensitivity is changed.

It is advised that RSEN is 100kΩ or less.

7

2006-04-11

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