M52760SP データシートの表示（PDF） - MITSUBISHI ELECTRIC

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M52760SP

PLL-SPLIT VIF/SIF IC

MITSUBISHI ELECTRIC  

MITSUBISHI ICs (TV)

M52760SP

PLL-SPLIT VIF/SIF IC

ELECTRICAL CHARACTERISTICS TEST METHOD

Video S/N

Input SG2 into VIF IN and measure the video out (Pin 18) noise in

r.m.s at TP18B through a 5MHz (-3dB) L.P.F.

S/N=20 log 0.7×Vo det (dB)

NOISE

BW Video band width

1. Measure the 1MHz component level of EQ output TP18A with a

spectrum analyzer when SG3 (f2=57.75MHz) is input into VIF

IN. At that time, measure the voltage at TP8 with SW8, set to

position 2, and then fix V8 at that voltage.

2. Reduce F2 and measure the value of (f2-f0) when the (f2-f0)

component level reaches -3dB from the 1MHz component level

as shown below.

TP18

-3dB

V3 RF AGC operating voltage

Input SG8 into VIF IN, and gradually reduce Vi and then measure

the input level when RF AGC output TP3 reaches 1/2 VCC, as

shown below.

TP3

Voltage

V3H

1/2VCC

V3L

Vi

Vi (dBµ)

CL-U Capture range

1. Increase the frequency of SG9 until the VCO is out of locked-

oscillation.

2. Decrease the frequency of SG9 and measure the frequency fU

when the VCO locks.

CL-U=fU-58.75 (MHz)

1MHz

( f2 - f0 )

BW

VIN MIN Input sensitivity

Input SG4 (Vi=90dBµ) into VIF IN, and then gradually reduce Vi and

measure the input level when the 20kHz component of EQ output

TP18A reaches -3dB from Vo det level.

VIN MAX Maximum allowable input

1. Input SG5 (Vi=90dBµ) into VIF IN, and measure the level of the

20kHz component of EQ output.

2. Gradually increase the Vi of SG and measure the input level

when the output reaches -3dB.

GR AGC control range

GR=VIN MAX-VIN MIN (dB)

CL-L Capture range

1. Decrease the frequency of SG9 until the VCO is out of locked-

oscillation.

2. Increase the frequency of SG9 and measure the frequency fL

when the VCO locks.

CL-L=58.75-fL (MHz)

CL-T Capture range

CL-T=CL-U+CL-L (MHz)

VCO ∆f VCO SW on drift

1. Input SG2 into VIF IN .

2. Adjust the VCO coil so that AFT voltage can be reached to 1/2

Vcc in 10 seconds after the power switch is turned to on.

3. IF AGC FILTER (Pin8) is connected to GND (0V) after turning off

the VIF input.

4. And then, measure each free running frequencies of 10 and 60

seconds later.

VCO ∆f (kHz) = frequency2 (60 sec. later)

-frequency1 (10 sec. later)

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