TA2012F TOSHIBA [Toshiba Semiconductor], TA2012F Datasheet - Page 7

• Manufacturer Part Number: TA2012F
• Description: 3V AM / FM IF + MPX (For Digital Tuning System)
• Manufacturer: TOSHIBA [Toshiba Semiconductor]

Application Note
1. How to control the IF count output signal (pin(9) output)
2. How to control the divider of FM IF
3. How to adjust the IF count output sensitivity
· Whether or not there is the IF count output signal (pin(9) output) is determined by the and of the pin(8)
· The output impedance of pin(9) is 1.5kΩ (typ.) (cf.P.4)
· The signal waveform is the rectangular wave, and the level is 500mV
· The IF count output sensitivity (search sensitivity)
· However, this is only possible at the auto-tuning mode. (external voltage supplied to pin(8) is at high level.)
control voltage: V
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.
It is possible to reduce the IF count output signal level to add the resistance between the pin(9) and the V
line.
Can be adjusted by varying the IF AMP gain for FM and varying the MIXER gain for AM.
This setting is made by changing the value of external resistance R
pin(2).
The original again returns while receiving a broadcast station (supplied voltage to pin(8) is at low level.)
V
TUN LED: ON (V
8
: High (active high, V
8
Switch
and tuning LED on / off switching.
in
GND or OPEN: 1.3375MHz output (1 / 8 dividing)
≥ V
V
CC
L
TH
: 10.7MHz output
+2dBµV EMF (typ.))
= 0.8V (typ.))
7
TA8132AN / AF , TA2012N / F
V
8
2
which is connected to
p - p
H
L
(typ.)
Non output
Come out
ON
TUN LED
2002-10-30
Non output
Non output
OFF
CC