參數(shù)資料
型號(hào)： 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(yè)數(shù)： 14/28頁(yè)
文件大?。?/td> 230K
代理商： CXA3627N
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14
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CXA3627N
Description of Functions
The CXA3627N is the terrestrial TV broadcasting tuner IC which converts frequencies to IF in order to tune
and detect only the desired reception frequency of VHF and UHF band signals.
In addition to the mixer, local oscillation and IF amplifier circuits required for frequency conversion to IF, this IC
also integrates a PLL circuit for local oscillation frequency control onto a single chip.
The functions of the various circuits are described below.
1. Mixer circuit
This circuit outputs the frequency difference between the signal input to VHFIN or UHFIN and the local
oscillation signal.
2. Local oscillation circuit
A VCO is formed by externally connecting an LC resonance circuit composed of a varicap diode and inductance.
3. IF amplifier circuit
This circuit amplifies the mixer IF output, and consists of an amplifier stage and low impedance output stage.
4. PLL circuit
This PLL circuit fixes the local oscillation frequency to the desired frequency. It consists of a programmable
divider, reference divider, phase comparator, charge pump and reference oscillator. The control format
supports the I
2
C bus format.
The frequency steps of 31.25, 50 or 62.5kHz can be selected by the I
2
C bus data-based reference divider
frequency division setting value.
5. Band switch circuit
The CXA3555N has four sets of built-in PNP transistors for switching between the VL, VH and UHF bands
and for switching the FM trap, etc. These PNP transistors can be controlled by the bus data.
The emitters for these PNP transistors are connected to the power supply pin (V
CC
), and are ON and output
5V when the bus data is "1 (H)".
Two types of relations of the bus data and the IC internal OSC/MIX circuits operation are available as shown
below. These relations can be selected by grounding or leaving open Pin 12 (BYP).
BYP: Grounding
: Don't care O: Operating X: Not operating
Band SW data
BS1
MIX circuit
OSC circuit
BS2
BS3
BS4
0
1
VHF
O
X
UHF
X
O
VHF
O
X
UHF
X
O
BYP: Open
Band SW data
BS1
MIX circuit
OSC circuit
BS2
BS3
0
1
BS4
VHF
O
X
UHF
X
O
VHF
O
X
UHF
X
O
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