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參數(shù)資料
| 型號： | CXA3627N |
| 英文描述： | All Band Tuner IC with On-chip PLL |
| 中文描述： | 所有波段調(diào)諧器集成電路片上鎖相環(huán) |
| 文件頁數(shù)： | 15/28頁 |
| 文件大?。?/td> | 230K |
| 代理商： | CXA3627N |
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CXA3627N
Description of Analog Block Operation (See the Electrical Characteristics Measurement Circuit.)
VHF oscillator circuit
This is the differential amplifier-type oscillator circuit. Pins 16 and 19 are base and Pins 17 and 18 are
collector. Pins 16, 18 and Pins 19, 17 have the in-phase input/output relation respectively.
This circuit is oscillated with the positive feedback applied by connecting the output to the input via the
coupling capacitor and the feedback capacitor.
Oscillation frequency is varied by connecting an LC parallel resonance circuit including a varicap and controlling
the voltage applied to the varicap.
VHF mixer circuit
The mixer circuit employs a double balanced mixer with little local oscillation signal leakage.
The input format is base input type, with Pin 12 grounded either directly or via a capacitor and the RF signal
input to Pin 11.
(Pin 12 can also be used to select VHF/UHF switching mode with the BS3/BS4 data.)
The RF signal is fed from the oscillator, converted to IF frequency and output from Pins 8 and 9. Pins 8 and
9 are open collectors, so external power feed is necessary. Also, connect single-tuned filters to Pins 8 and 9.
UHF oscillator circuit
The oscillator circuit is designed so that two collector ground type Colpitts oscillators perform differential
oscillation operation via an LC resonance circuit including a varicap.
Resonance capacitance is connected between Pins 20 and 21, Pins 21 and 22, and Pins 22 and 23, and an
LC resonance circuit including a varicap is connected between Pins 20 and 23.
UHF mixer circuit
This circuit employs a double balanced mixer like the VHF mixer circuit.
The input format is base input type, with Pins 14 and 15 as the RF input pins. The input method can be
selected from balanced input consisting of differential input to Pins 14 and 15 or unbalanced input consisting
of grounding Pin 14 via a capacitor and input to Pin 15.
Pins 8 and 9 are the mixer outputs. Pins 8 and 9 are open collectors, so external power feed is necessary.
Also, connect single-tuned filters to Pins 8 and 9.
IF amplifier circuit
Pins 5 and 6 are the IF amplifier inputs, and the input impedance is approximately 1.6k
.
The signals frequency converted by the mixer are output from Pins 8 and 9, and Pins 8 and 9 are connected
to Pins 5 and 6 via capacitors. (An adjacent channel trap circuit can be formed by connecting LC parallel
circuits in place of capacitors.)
The signal amplified by the IF amplifier is output from Pin 30. The output impedance is approximately 10
.
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