LA75501V

No.A0224-9/10

V28. VCO control sensitivity [

β]

(1) Apply the VCC voltage to the external AGC, IF AGC (pin 18).

(2) Apply the 3V to the external FLL, FLL (pin 10).

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

And adjust the VCO coil so that the frequency becomes 38.9MHz.

(4) 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 frequency when 3.2V is applied to the APC pin (pin 9).

β = f2−

(kHz/mV)

F1. 1st SIF conversion gain [VG]

(1) Internal AGC

(2) fp = 38.9MHz CW;10mV (VIF input)

fs = 33.4MHz CW;500

µV (1st SIF input) ····· V1

(3) measure the detection output level at test point C (5.5MHz) ····· V2

(4) VG = 20log

dB

F2. 5.5MHz output level [So]

(1) Internal AGC

(2) fp = 38.9MHz CW; 10mV (VIF input)

fs = 33.4MHz CW; 10mV (1st SIF input) ····· V1

(3) Measure the detection output level at test point C (5.5MHz). ····· So (mVrms)

F3. 1st maximum input [Si max]

(1) Internal AGC

(2) fp = 38.9MHz CW; 10mV (VIF input)

fs = 33.4MHz CW; Variable (1st SIF input)

(3) Input level at which the detection output (5.5MHz) at test point C becomes So ±2dB. ····· Si max

F4.F5. 1st SIF input resistance, input capacitance [Ri (SIF1), Ci (SIF1)]

(1) Referring to the Input Impedance Test Circuit, measure Ri and Ci with an impedance analyzer.

S1. SIF Limiting sensitivity [Vi (lim)]

(1) Apply the VCC voltage to the external AGC, IF AGC (pin 18).

(2) fs = 5.5MHz fm = 400Hz

∆F = ±300kHz (SIF input)

(3) Set the SIF input level to 31.6mVrms and measure the level at test point D. ····· V1

(4) Lower the SIF input level and measure the input level which becomes V1. ····· 3dB.

S2.S4. FM detection output voltage, total harmonics distortion [VO(FM), THD]

(1) Apply the VCC voltage to the external AGC, IF AGC (pin 18).

(2) fs = 5.5MHz fm = 400Hz

∆f = ±30kHz

(SIF input Vi = 31.6mVrms)

(3) Measure the FM detection output voltage, total harmonics distortion at test point D.

S3. AM rejection ratio [AMR]

(1) External AGC (V18 =VCC)

(2) fs = 5.5MHz fm = 400Hz AM = 30%

(SIF input Vi = 31.6mVrms)

(3) Measure the output level at test point D. ····· VAM

(4) AMR = 20log

dB

S5. SIF S/N [S/N (FM)]

(1) External AGC (V15 = VCC)

(2) fs = 5.5MHz NO MOD Vi = 31.6mVrms

(3) Measure the output level at test point D. ····· Vn

(4) S/N = 20log

dB

V2

V1

f1

− f2

400

VO (DET)

VAM

VO (DET)

Vn