M52342SP 查看數據表（PDF） - MITSUBISHI ELECTRIC

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M52342SP

PLL-SPLIT VIF/SIF IC

MITSUBISHI ELECTRIC  

Pin 1 (RF AGC DELAY)

VCC

1

MITSUBISHI ICs (TV)

M52342SP

PLL-SPLIT VIF/SIF IC

An applied voltage to the pin1 is for changing a RF AGC delay point.

In the 3-in-1 type∗ application, the regulated output from the regulator is

suitable for a power supply (Vcc) to it, because there may be difference

between the tuner and main board supply.

∗ TV tuner, VIF demodulator and RF modulator are togetherin one package.

Pin 2 (AFT OUTPUT)

The maximum

outflow current

is 0.2 mA.

The maximum

inflow current

is 0.2 mA.

VCC (supply to a tuner)

2

Tuner

Since an AFT output is provided by a high impedance source, the detection

sensitivity can be set by an external resistor.

The muting operation will be on in following two cases;

1) the APC is out of locking,

2) the video output becomes small enough in a weak

electric field.

Vcc

[V2]

Vcc

2

(in open-loop condition)

0

[fo]

Pin 3 (RF AGC OUTPUT)

A current mode output is available in the reverse AGC operation.

The fluctuation of a bottom voltage is made small by loading higher impedance for

a deep saturation.

The maximum

inflow current

is 0.2 mA.

VCC (supply to a tuner)

3

Tuner

VCC

(supply voltage to a tuner)

(in open-loop condition)

[V3]

weak

electric field

0

[IF input]

strong

electric field

Note: Connecting a nonpolarity capacitor of 1µF between pin1 and pin 3 improves AGC operating speed.

In that case, the capacitors between pin1/pin3 and ground should be removed.

9

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