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參數(shù)資料
| 型號： | TK14551VTL |
| 廠商： | TOKO INC |
| 元件分類： | 通信及網(wǎng)絡(luò) |
| 英文描述： | FM IF DETECTOR/AMPLIFIER |
| 中文描述： | SPECIALTY TELECOM CIRCUIT, PDSO24 |
| 封裝： | TSSOP-24 |
| 文件頁數(shù)： | 25/32頁 |
| 文件大?。?/td> | 334K |
| 代理商： | TK14551VTL |
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January 2000 TOKO, Inc.
Page 25
TK14551V
CIRCUIT DESCRIPTION
Center Voltage of Detector DC Output:
The center voltage of the detector DC output is determined by the internal reference voltage source. It is impossible to
change this internal reference voltage source, but it is possible to change the center voltage by the following method.
As illustrated in Figure 10, the demodulated output current at Pin 8 is converted to the voltage by an external resistor R1,
without using the internal OP AMP.
Figure 11 shows an example of a simple circuit that divides the supply voltage into halves using resistors. Since both
circuits have a high output impedance, an external buffer amplifier should be connected.
Demodulated
Output Current
Demodulated
Output Voltage
VOUT
Vref
I to V convertor
io
VB
R1
C1
FIGURE 10 - EXAMPLE OF USING EXTERNAL REFERENCE SOURCE
Demodulated
Output Voltage
VOUT
R1
C1
R2
VCC
Demodulated Output Voltage V
OUT
= VB
±
R1 x io
Demodulated Bandwidth
1/gm is approximately 50 k
which is the output resistance of the
multiplier.
Pin 9 is disconnected.
Fc =
Demodulated Output Voltage V
OUT
= V
CC
/ 2
±
R1 x io
Demodulated Bandwidth
1/gm is approximately 50 k
, which is the output resistance of the
multiplier.
Pin 9 is disconnected.
Fc =
1
2
π
C1(1/gm)
1
2
π
C1(1/gm)
FIGURE 11 - EXAMPLE OF DIVIDING SUPPLY VOLTAGE INTO HALVES BY RESISTORS
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