Samsung LE32R73BD, Руководство по обслуживанию

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13 Circuit Descriptions
13-5
3. General Characteristics
3-1 Temperature Range
Storage Temperature : -20
℃
~ +80
℃
Operation Temperature : 0
℃
~ +65
℃
3-2 Test conditions : All data hold under following conditions
T(amb.) : +25
±
2
℃
/ Humidity : 45 ~ 65 % RH
Supply voltage(5V) : +5V
±
2%
Tuning voltage (BT) : +30V
±
2%
Supply voltage(3.3V) : +3.3V
±
2%
3-3 Current Consumption
Supply Voltage (5V) : 180mA Max.
Tuning Voltage(30V) : 5mA Max.
Supply Voltage(3.3V) : 160mA Max.
4. Electrical Characteristics ( RF block & Digital Demodulation )
4-1 Input Frequency Range
VHF-Low Band : 47MHz ~ 174MHz
VHF-High Band : 174MHz ~ 470MHz
UHF Band : 470MHz ~ 862MHz
4-2 Input Signal Level : -78dBm ~ -20dBm (Average power, 64QAM)
4-3 Voltage Gain
1st IF : 40dB typ. 38dBmin.
4-4 Noise Figure
1st IF : 4.5dB typ. 6.5dB max. (at max. gain)
4-5 OFDM-Demod IC : MT353 (produced by Zarlink)
4-6 Input Impedance : 75
Ω
.
4-7 RF Input/Output Return Loss : -8dB typ. -6dB min.
4-8 IF Frequency
1) Digital center frequency : 36.167MHz
2) Analog (PAL B/G, I, D/K, SECAM L/L')
Picture intermediate frequency :
38.9MHz(PAL B/G & SECAM L), 33.9MHz(SECAM L')
Sound intermediate frequency :
33.4MHz(B/G), 32.9MHz(I), 32.4MHz(D/K,SECAM L), 40.4MHz(SECAM L')
4-9 IF Response curve
1) Amplitude ripple in band (AGC Volt 4.0 ~ 0.8V) :
±
3dB max.
Center¡¾4MHz ( Above 306MHz)
Center¡¾3.5MHz ( Below 300MHz)
2) 3dB bandwidth in band (AGC Volt 4.0 ~ 0.8V) for digital channel receiving
8MHz : The GPP3 port of the MT353 is high level.
7MHz : The GPP3 port of the MT353 is low level.
4-10 Spurious Signals at Input Terminal
Local Oscillator Leakage : 46dBuV max.