LA76818 データシートの表示（PDF） - SANYO -> Panasonic

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LA76818

The BUS Control Functions of LA76818 (Tentative)

SANYO -> Panasonic 

Technical Note of LA76818

2002/01/23

Pin 2 (FM Output)

This is an output pin for FM detector. The output circuit is a voltage follower.

The DC voltage is about 2.5V and the dynamic range is 4V.

The setting of BUS is depending on the frequency of SIF:

SIF frequency

BUS setting

4.5MHz

‘00’

5.5MHz

’01’

6.0MHz

‘10’

6.5MHz

‘11’

The output level is variable which is controlled by BUS:

BUS setting for FM Gain

Output level

‘0’

1000mVrms (±50KHz)

‘1’

1000mVrms (±25KHz)

The output impedance is variable which is controlled by BUS:

BUS setting for Deem-TC

Output Impedance

‘0’

5.0KΩ

‘1’

7.5KΩ

The time constant of the de-emphasis is determined by the value of external

capacity (0.01uF). There is no necessary to connect an external capacity if a stereo IC

is used. But, the output impedance is very high. This pin is also used to be an internal

pin for audio SW.

２

2K

300u

R1(PAL)

R2(NT)

300u

300

FM 檢波信號

Audio

SW

BUS:Deem-TC

50u

The circumference circuit of pin 2

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