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參數(shù)資料
| 型號(hào)： | M51348FP |
| 廠商： | Mitsubishi Electric Corporation |
| 英文描述： | POCKET TV IF SYSTEM |
| 中文描述： | 口袋電視如果系統(tǒng) |
| 文件頁(yè)數(shù)： | 7/10頁(yè) |
| 文件大?。?/td> | 121K |
| 代理商： | M51348FP |
M51348AVP
Rev.1.0, Sep.19.2003, page 7 of 9
Precaution concerning electical charactristics
1)
Voltage Supplied (pins 5 and 9)is 4.5V unless otherwise noted in the conditions column.
2)
VIF input amplitude (Vin)is the amplitude of VFI IN in the circuit below.Feed SG1 90dB
μ
signal into the circuit
below,and measure the DC voltage V2 at 2.Set the circuit for AC voltage measurement and adjust the input
amplitude,monitoring DC voltage at 2 ,until it reaches the level of V2.90dB
μ
is defined as the input amplitude at
that time.
50
0.01
μ
F
6
7
8
0.01
μ
F
VIF IN
3) lnput signals are shown below.
SG1
fo=58.75MHz
fm=20KHz
77.8%AM
SG2
f1=58.75MHz
Vi=90dB
μ
CW
f2=53 ±5MHz
Vi=70dB
μ
CW
SG3
fo=58.75MHz
Linearity 10step signal
(87.5%Video modulation)
SG4
fo=58.75MHz
CW
SG5
fo=58.75 ±5MHz
CW(SWEEP)
SG6
fo=4.5MHz
FM 25KHz dev
fm=400Hz
SG7
fo=4.5MHz
AM 30%
fm=400Hz
SG8
fo=4.5MH
±200KH
FM 7.5KHz dev
fm=400Hz
SG9
4) Adjustment of LLD coil
1.
Feed SG5 Vi=90dB
μ
into VIF IN.
2.
AFT coil must be shifted to detuned condition.
3.
Feed outside voltage to 2 and check tank response at 18 as shown in the figure below.
4.
Adjust LLD coil so that peak comes at 58.75MHz.
fo=4.5MH
FM 7.5KHz dev
fm=400Hz
V18
f
0.6Vp-p
58.75MHz
DC level with no signal
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