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參數(shù)資料
| 型號(hào)： | CXA1695 |
| 廠商： | Sony Corporation |
| 英文描述： | All Band TV Tuner IC (VHF-CATV-UHF) |
| 中文描述： | 所有帶電視調(diào)諧器集成電路（甚高頻，有線電視，超高頻） |
| 文件頁數(shù)： | 6/10頁 |
| 文件大?。?/td> | 166K |
| 代理商： | CXA1695 |
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CXA1695L
Description of Operation
(See Electrical Characteristics Test Circuit)
(1) VHF oscillator circuit
The differential oscillator circuit with Pin 11 output and Pin 9 input.
Connect an LC resonance circuit comprising a varicap diode to Pin 11 through a coupling capacitor. The
positive feedback from the resonance circuit is applied to Pin 9 through a feedback capacitor to execute
oscillation. Note that if a parasitic capacitance across Pins 9 and 11 is too large, it may cause undesired
oscillation.
(2) VHF mixer circuit
This is a double-balanced mixer having small leakage of local oscillation signal. The RF signal input
terminal are Pins 2 and 4. In normal use, the signal is input to one pin while the other pin is connected to
GND by decoupling capacitor. The RF signal is converted to IF with the signal supplied from oscillator.
The converted RF is sent to the IF amplifier and output to Pins 3 and 5 simultaneously.
(3) UHF oscillator circuit
This is the differential oscillator same circuit as the VHF oscillator. In Electrical Characteristics Test Circuit,
oscillation is executed as a Colpitts oscillator using one side transistor of the differential amplifier.
(4) UHF mixer circuit
This is the double-balanced mixer same circuit as the VHF mixer. The RF signal input terminal are to Pins
10 and 12.These are used balanced differential input from pre-stage double tune circuit, or an unbalanced
input to Pin 10 with the capacitor connected at Pin 12 to GND. Balanced input achieves better NF rather
than unbalanced input.
Otherwise, the conditions and usage are the same as for the VHF mixer.
(5) IF amplifier circuit
The mixer output signal is amplified by the IF amplifier and output to Pin 1. The output impedance is
approximately 75
.
(6) UHF/VHF switching circuit
UHF / VHF modes are switched by the DC voltage at Pin 7. UHF operation is for open or 0V; VHF
operation, for 3V or more.
Normally, for internal protection UHF/VHF switch is performed by 9V or open through about 10k
resistor.
Notes on Usage
Care should be taken in placing external parts because high frequencies are present. Adjust accordingly
to prevent heat problems with special care for Pins 6 and 13 (GND) whose heat dissipation accumulate.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| CXA1779P | 制造商:Panasonic Industrial Company 功能描述:IC |
| CXA1816-0000-000N00M40E8 | 功能描述:大功率LED - 白色 Warm White, 2700K 1682lm, 450mA, 80CRI RoHS:否 制造商:Cree, Inc. 照明顏色:Warm White 顏色溫度:2700 K 光通量:1682 lm 顯示角:115 deg 正向電流:450 mA 正向電壓:37 V 安裝風(fēng)格:SMD/SMT 系列:CXA1816 封裝:Tray |
| CXA1816-0000-000N00M427F | 功能描述:大功率LED - 白色 Warm White, 2700K 1682lm, 450mA, 80CRI RoHS:否 制造商:Cree, Inc. 照明顏色:Warm White 顏色溫度:2700 K 光通量:1682 lm 顯示角:115 deg 正向電流:450 mA 正向電壓:37 V 安裝風(fēng)格:SMD/SMT 系列:CXA1816 封裝:Tray |
| CXA1816-0000-000N00M427H | 功能描述:大功率LED - 白色 Warm White, 2700K 1682lm, 450mA, 80CRI RoHS:否 制造商:Cree, Inc. 照明顏色:Warm White 顏色溫度:2700 K 光通量:1682 lm 顯示角:115 deg 正向電流:450 mA 正向電壓:37 V 安裝風(fēng)格:SMD/SMT 系列:CXA1816 封裝:Tray |
| CXA1816-0000-000N00N20E6 | 功能描述:大功率LED - 白色 Warm White, 3500K 1762lm, 450mA, 80CRI RoHS:否 制造商:Cree, Inc. 照明顏色:Warm White 顏色溫度:3500 K 光通量:1762 lm 顯示角:115 deg 正向電流:450 mA 正向電壓:37 V 安裝風(fēng)格:SMD/SMT 系列:CXA1816 封裝:Tray |
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