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參數資料
| 型號： | LA7567EV |
| 元件分類： | 接收器 |
| 英文描述： | AM/FM, AUDIO/VIDEO DEMODULATOR, PDSO24 |
| 封裝： | 0.275 INCH, SSOP-24 |
| 文件頁數： | 2/21頁 |
| 文件大小： | 208K |
| 代理商： | LA7567EV |
S1. SIF limiting sensitivity . . . . . . . . . . . . . . . . . . [Vli(lim)]
(1) Apply the VCC voltage to the external AGC, IF AGC (pin 17).
(2) fs = 5.5MHz fm = 400Hz
F = ±30kHz (SIF input)
(3) Set the SIF input level to 100mVrms and then measure the level at test point D.......V1
(4) Lower the SIF input level until V1-3dB occurs. Measure the input level at that moment.
S2–5. S7–10. FM detection output voltage, distortion factor . . . . . . [VO(FM, THD]
(1) Apply the VCC voltage to the external AGC, IF AGC (pin 17).
(2) fs = 4.5MHz fm = 1kHz
F = ±25kHz, fs = 5.5MHz or 6.0MHz fm = 1kHz F = ±50kHz,
(SIF input Vi = 100mVrms)
(3) Assign the level at test point D to the FM detection output voltage and measure the distortion factor.
S3. AM rejection ratio . . . . . . . . . . . . . . . . . . . . . . [AMR]
(1) Apply the VCC voltage to the external AGC, IF AGC (pin 17).
(2) fs = 5.5MHz fm = 400Hz AM = 30%
(SIF input Vi=100mVrms)
(3) Measure the output level at test point D............VAM
(4)
S5. SIF S/N . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [S/N]
(1) External AGC (V17 = VCC)
(2) fs = 5.5MHz NO MOD Vi = 100mVrms
(3) Measure the output level at test point D...........Vn
(4)
C1. Converter conversion gain . . . . . . . . . . . . . . VG(SIF)
(1) Internal AGC
(2) fp = 38.9MHz CW; 10mV (VIF input)
fs = 33.4MHz CW; 316
V (First SIF input)
(3) Measure the 6MHz component at test point E (MIX output). ...................V1
(4) Measure the 5.5MHz component at test point F (NICAM output). ...........V2
(5)
C2. SIF converter maximum output level . . . . . . [Vmax]
(1) Internal AGC
(2) fp = 38.9MHz CW; 10mV (VIF input)
fs = 33.4MHz CW; 10mV (First SIF input)
(3) Measure the 6MHz component at test point E (MIX output). .........Vmax(dBV)
C3. Carrier suppression ratio (VGR(5.5))
(1) Internal AGC
(2) fp = 38.9MHz CW; 10mV (VIF input)
fs = 33.4MHz CW; 316
V (First SIF input)
(3) Measure the 6MHz component at test point E (MIX output). .........V6 (dB
V)
(4) Measure the 5.5MHz component at test point E (MIX output). ......V5.5 (dB
V)
(5) Perform the following calculation.
Carrier suppression ratio VGR(5.5)(dB) = V6 - V5.5
No.7779-10/21
LA7567EV
dB
VAM
VO(DET)
20log
AMR =
dB
Vn
VO(DET)
20log
S/N =
dB
V2
V1
20log
VG mix =
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