U2514B データシートの表示（PDF） - Temic Semiconductors

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U2514B

AM/FM Receiver for Digital Tuning with FM-Stereo Decoder

Temic Semiconductors 

AMIFIN

3.3 k

13

AMIFIN

VREF

12421

Figure 10.

FMDET

U2514B

VREF

150 mA

Figure 12.

15

FMDET

12422

W The input impedance of the AM IF amplifier is 3.3 k

according to the required impedance of most ceramic

filters. The input refers to VREF (Pin 14).

The discriminator allows the connection of a ceramic

resonator or LC tank. A minimization of THD and

adjustment of center frequency versus temperature can

only be achieved by using a LC tank. This performs a

temperature independent stop signal.

FMIFIN

AFSM

25 MPXOUT

11 AFSM

40 mA

12

FMIFIN

100 k

12423

GND

Figure 13.

12424

Figure 11.

W The input impedance of the FM IF amplifier is 330

according to the required impedance of most FM ceramic

filters. The input referes to GND (Pin 16).

A capacitor is connected between AFSM (Pin 11) and

GND for smoothing of the FM-AF. This is necessary to

generate a modulation independent stop signal. (Because

the deviation of the FM signal (75 kHz) can be greater

than the stop signal window (25 kHz)). In the

AM-search-mode, the external capacitor smoothes the

demodulated AM-IF-signal.

TELEFUNKEN Semiconductors

5 (15)

Rev. A2, 04-Nov-96

Preliminary Information

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