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参数资料
| 型号： | LA75676VA |
| 厂商： | SANYO SEMICONDUCTOR CO LTD |
| 元件分类： | 接收器 |
| 英文描述： | AM/FM, AUDIO/VIDEO DEMODULATOR, PDSO24 |
| 封装： | 0.225 INCH, SSOP-24 |
| 文件页数： | 9/10页 |
| 文件大小： | 93K |
| 代理商： | LA75676VA |
LA75676VA
No.7868-8/10
V21, V22. VIF input resistance, input capacitance [Ri, Ci]
1. Use an impedance analyzer to measure Ri and Ci in the input impedance test circuit.
V23, V24. APC pull-in range [fpu, fpl]
1. Internal AGC
2. fp = 39MHz to 51MHz, CW : 10mVrms
3. Vary the signal generator from fp = 45.75MHz towards higher frequencies until PLL lock is lost.
Note : PLL lock is lost at the point beating is output at test point A.
4. Lower the signal generator frequency until the PLL locks again. (f1)
5. Lower the signal generator frequency until PLL lock is lost.
6. Raise the signal generator frequency until the PLL locks again. (f2)
7. Perform the following calculations.
fpu = f1 - 45.75MHz
fpl = f2 - 45.75MHz
V25. AFT tolerance frequency 1 [
Fa1]
1. Internal AGC
2. SG1 : Vary this frequency from 43.75MHz to 47.75MHz, CW, 10mVrms
3. Vary the SG1 frequency so that the AFT output (test point B) becomes 2.5V.
Record the SG1 frequency at that point as f1.
4. External AGC (Adjust V17.)
5. Apply 5V to the IF AGC (pin 17), pick up the VCO oscillator frequency from ground or some other point, and
measure that frequency. f2
6. Perform the following calculation.
AFT tolerance frequency 1
Fa1 = f2 - f1 (kHz)
V26, V27. VCO maximum range (U, L) [dfu, dfl]
1. External AGC. Apply the VCC voltage to the IF AGC (pin 17).
2. Pick up the VCO oscillator frequency from the video output (A), ground, or some other point and adjust the VCO
coil so that frequency becomes 45.75MHz.
3. Apply 1V to the APC pin (pin 9) and let fl be the frequency at that time.
Similarly, apply 5V and let fu be the frequency at that time.
dfu = fu - 45.75MHz
dfl = fl - 45.75MHz
V28. VCO control sensitivity [
β]
1. External AGC. Apply the VCC voltage to the IF AGC (pin 17).
2. Pick up the VCO oscillator frequency from the video output (A), ground, or some other point and adjust the VCO
coil so that frequency becomes 45.75MHz.
3. Apply 3V to the APC pin (pin 9) and let f1 be the frequency at that time.
Similarly, apply 3.4V and let f2 be the frequency at that time.
β =
f2 - f1
400
(kHz/mV)
相关PDF资料 |
PDF描述 |
|---|---|
| LA75676V | AM/FM, AUDIO/VIDEO DEMODULATOR, PDSO24 |
| LA75676V | AM/FM, AUDIO/VIDEO DEMODULATOR, PDSO24 |
| LA7567BM | AM/FM, AUDIO/VIDEO DEMODULATOR, PDSO24 |
| LA7567B | AM/FM, AUDIO/VIDEO DEMODULATOR, PDIP24 |
| LA7567BM | AM/FM, AUDIO/VIDEO DEMODULATOR, PDSO24 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LA75676VA-TLM-E | 制造商:Sony Semiconductor Solutions Division 功能描述: |
| LA75676V-S | 制造商:SANYO 制造商全称:Sanyo Semicon Device 功能描述:VIF/SIF IF Signal-Processing Circuit for TV and VCR Products |
| LA7567B | 制造商:SANYO 制造商全称:Sanyo Semicon Device 功能描述:LA7567B, LA7567BM |
| LA7567BM | 制造商:SANYO 制造商全称:Sanyo Semicon Device 功能描述:LA7567B, LA7567BM |
| LA7567EV | 制造商:SANYO 制造商全称:Sanyo Semicon Device 功能描述:TV and VCR VIF/SIF IF Signal-Processing Circuit with PAL/NTSC Multi-Format Audio Support |
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