TA8132AN / AF , TA2012N / F

2002-10-30

7

Application Note

1. How to control the IF count output signal (pin(9) output)

TUN LED

ON

OFF

H

Come out

Non output

L

Non output

Non output

· Whether or not there is the IF count output signal (pin(9) output) is determined by the and of the pin(8)

In the condition of

the IF count output signal comes out from the pin(9).

In the case of the tuning LED function is not needed, it doesn't matter the pin(10) is opened.

· The output impedance of pin(9) is 1.5kΩ (typ.) (cf.P.4)

line.

2. How to control the divider of FM IF

Switch

GND or OPEN: 1.3375MHz output (1 / 8 dividing)

3. How to adjust the IF count output sensitivity

· The IF count output sensitivity (search sensitivity)

Can be adjusted by varying the IF AMP gain for FM and varying the MIXER gain for AM.

pin(2).

· However, this is only possible at the auto-tuning mode. (external voltage supplied to pin(8) is at high level.)

The original again returns while receiving a broadcast station (supplied voltage to pin(8) is at low level.)