la75693m Sanyo Semiconductor Corporation, la75693m Datasheet - Page 8

• Manufacturer Part Number: la75693m
• Description: Pal/ntsc Multi-channel Audio Vif/sif Signal Processing Ic For Tvs And Vcrs
• Manufacturer: Sanyo Semiconductor Corporation

V21.V22 VIF input resistance, Input capacitance [R i , C i ]
V23.V24 APC pull-in range [fpu, fpl]
V25. AFT tolerance frequency 1 [∆Fa1]
V26.V27 VCO Maximum variable range (U, L) [dfu, dfl]
V28. VCO control sensitivity [β]
S1. 4.5MHz output level [Vsout]
Note 1) Unless otherwise specified for VIF test, apply the V CC voltage to the IF AGC and adjust the VCO coil so that
Note 2) Unless otherwise specified, leave the SW1 turned ON.
(1) Referring to the input impedance Test Circuit, measure R i and C i with an impedance analyzer.
(1) Internal AGC
(2) fp = 39MHz to 51MHz CW ; 10mVrms
(3) Adjust the SG signal frequency to be higher than fp = 45.75MHz to bring the PLL to unlocked state.
(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 unlocked state.
(6) When the SG signal frequency is raised, the PLL is brought to locked state again. …… f2
(7) Calculate as follows:
(1) Internal AGC
(2) SG1:43.75MHz to 47.75MHz variable CW 10mVrmns
(3) Adjust the SG1 signal frequency so that the AFT output DC voltage (test point B) becomes 2.5V; that SG1 signal
(4) External AGC (Adjust the V 17 .)
(5) Apply 9V to the IFAGC (pin 17) and then pick up the VCO oscillation frequency from the GND, etc.; that
(6) Calculate as follows: AFT tolerance frequency ∆ Fa1 = f2 - f1 (kHz)
(1) Apply the V CC 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
(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
(1) Apply the V CC 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
(3) f1 is taken as the frequency when 2.8V is applied to the APC pin (pin 9). In the same manner, f2 is taken as the
(1) Internal AGC (V 17 = V CC )
(2) fs = 4.5MHz NO MOD V i = 10mVrms
(3) Measure the output level at test point E. …… Vsout
Note; The PLL is assumed to be in unlocked state when a beat signal appears at test point A.
frequency is f1.
frequency is f2.
frequency becomes 45.75MHz.
frequency when 5V is applied to the APC pin (pin 9).
frequency becomes 45.75MHz.
frequency when 3.0V is applied to the APC pin (pin 9).
oscillation occurs at 45.7MHz.
fpu = f1 - 45.75MHz
fpl = f2 - 45.75MHz
dfu = fu - 45.75MHz
dfl = fl - 45.75MHz
β
=
2 f −
400
1 f
(
kHz
mV
)
LA75693M
No.0250-8/9