LA75694M 查看數據表（PDF） - SANYO -> Panasonic

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LA75694M

For Use in TV/VTR Applications IF Signal Processing (VIF/SIF for Hi-Fi)

SANYO -> Panasonic 

LA75694M

V23.V24. APC pull-in range [fpu, fpl]

(1) Internal AGC

(2) fp = 39MHz to 51MHz continuous wave; 10mVrms

(3) Adjust the SG signal frequency to be higher than fp = 45.75MHz to bring the PLL to unlocked state.

Note : The PLL is assumed to be in unlocked state when a beat signal appears at test point A.

(4) When the SG signal frequency is lowered, the PLL is brought to locked state again. ····· f1

(5) Lower the SG signal frequency to bring the PLL to unlock state.

(6) When the SG signal frequency is raised, the PLL is brought to locked state again. ····· f2

(7) Calculate as follows :

fpu = f1 – 45.75MHz

fpl = f2 – 45.75MHz

V25. AFT tolerance frequency 1 [∆Fa1]

(1) Internal AGC

(2) SG1 : 43.75MHz to 47.75MHz variable continuous wave 10mVrmns

(3) Adjust the SG1 signal frequency so that the AFT output DC voltage (test point B) becomes 2.5V;

that SG1 signal frequency is f1.

(4) External AGC (Adjust the V17.)

(5)Apply 5V to the IF AGC (pin 17) and then pick up the VCO oscillation frequency from GND, etc.;

and measure the frequency ····· f2

(6) Calculate as follows :

AFT tolerance frequency : ∆Fa1 = f2 – f1 (kHz)

V26.V27. VCO maximum variable range (U, L) [dfu, dfl]

(1) Apply the VCC voltage to the external AGC, IF AGC (pin 17).

(2) Pick up the VCO oscillation frequency from the VIDEO output (A), GND, etc.

and adjust the VCO coil so that the frequency becomes 45.75MHz.

(3) fl is taken as the frequency when 1V is applied to the APC pin (pin 9).

In the same manner, fu is taken as the frequency when 5V is applied to the APC pin (pin 9).

dfu = fl–45.75MHz

dfl = fl–45.75MHz

V28. VCO control sensitivity [β]

(1) Apply the VCC voltage to the external AGC, IF AGC (pin 17).

(2) Pick up the VCO oscillation frequency from the VIDEO output (A), GND, etc. and adjust the VCO coil

so that the frequency becomes 45.75MHz.

(4) f1 is taken as the frequency when 3.0V is applied to the APC pin (pin 9).

In the same manner, f2 is taken as the frequency when 3.4V is applied to the APC pin (pin 9).

β=

f2–f1

400

(kHz/mV)

V29. Synchronization ratio [VS]

(1) Internal AGC

(2) fp = 45.75MHz 87.5% 10STEP B/W

Vi = 10mVrms

(3) Measure the output amplitude at the measuring point A. ····· Vvideo

(4) Measure the pedestal voltage (DC) at the measuring point A. ····· Vped

VS = (Vped–V6tip) / Vvideo×100 (%)

No.A0251-8/10

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