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參數(shù)資料
| 型號(hào)： | TA2154AFN |
| 廠商： | Toshiba Corporation |
| 英文描述： | 1.5 V 1 Chip Tuner IC (for Digital Tuning System) |
| 中文描述： | 1.5伏特1芯片調(diào)諧器IC（數(shù)字調(diào)諧系統(tǒng)） |
| 文件頁(yè)數(shù)： | 7/13頁(yè) |
| 文件大?。?/td> | 171K |
| 代理商： | TA2154AFN |
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TA2154AFN
2002-10-21
7
Application Note
1. Mode switch
The IC controls the mode using pins 21 and 22. Switch conditions by modes are as listed below:
MODE1 (pin 21)
MODE2 (pin 22)
Standby
OPEN
OPEN
AM
OPEN
V
CC
FM
V
CC
OPEN
TV
V
CC
V
CC
To change mode, a 10 A (typ.) current must flow from the IC to the pin connected to V
CC
. When the pin is
open, set the pin voltage to 0.2 V or less (typ.).
2. Forced monaural switch
Forced monaural switch over is done by pin 14.
In case of the electrical switch over by transistor, set up V
CE
(saturation voltage between collector and emitter) 100 mV or less,
otherwise there are some cases that it does not become forced
monaural (VCO STOP) mode.
3. IF count output
To output the signal for IF count, connect IF REQ (pin 20) to GND via R
SEN
and input the IF count
sensitivity or larger.
Switch Condition
MODE1
MODE2
IF REQ
Output Frequency
Output Voltage
Output
Impedance
AM
OPEN
V
CC
450 kHz
180 mVp-p
FM
V
CC
OPEN
10.7 MHz
190 mVp-p
TV
V
CC
V
CC
Grounded via
R
SEN
10.7 MHz
190 mVp-p
2 k
4. Constant of LPF
Caputer range and Lock range is decided by constant of LPF, pin 14, 17, 18.
Care should be taken in changing constant of LPF. Otherwise there are some cases that stereo
characteristics may worse or IC may not operate stereo mode.
5. TV/FM local oscillator
This IC uses the same oscillator for TV and FM. The circuit structure is shown below. In TV mode, the IC
inputs the local oscillator frequency to the mixer as-is. In FM mode, the IC halves the local oscillator
frequency then inputs it to the mixer. This is how the IC receives TV and FM band frequencies.
V
CC
14
V
CE (sat)
When TV is on
24
23
OSC
1/2
divider
TV
MIX
FM
MIX
When FM is on
TV
FM
1/4
divider
1/4
divider
BUFF
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