LA1867NM Ver la hoja de datos (PDF) - SANYO -> Panasonic

Número de pieza

componentes Descripción

Fabricante

LA1867NM

Car Radio Single-Chip Tuner System

SANYO -> Panasonic 

Continued from preceding page.

Pin

Function

24 AFC

25 QD OUT

26 QD IN

27 VREF

LA1867NM

Unit (resistance:Ω, capacitance:F)

Equivalent internal circuit

Note

• R1 is the resistor that determines the band

muting bandwidth.

Increasing R1 reduces the bandwidth.

Decreasing R1 increases the bandwidth.

• Null voltage

When tuned, the voltage between pins 24

and 27 will be 0 V.

V24 – V27 = 0 V

The band muting is turned on when

| V24 – V27 | ≥ 0.7 V.

29 SD pin

SD sensitivity adjustment

30 pin

IF counter buffer

19

Seek/stop switch

The SD output for the pin 30 SD.

R determines the SD sensitivity.

Pin 23 is coupled to the muting drive output.

SD operates when the switch is off.

This pin is used for both the IF counter

buffer (AC output) and the seek/stop switch

(DC input).

It is not coupled to the SD output.

The IF buffer is turned on and off by the pin

19 DC bias level.

Pin 19: high → buffer on, low → buffer off.

No. 4619-10/32

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