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參數資料
| 型號： | TK14551V |
| 廠商： | TOKO INC |
| 元件分類： | 通信及網絡 |
| 英文描述： | FM IF DETECTOR/AMPLIFIER |
| 中文描述： | SPECIALTY TELECOM CIRCUIT, PDSO24 |
| 封裝： | TSSOP-24 |
| 文件頁數： | 24/32頁 |
| 文件大?。?/td> | 334K |
| 代理商： | TK14551V |
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Page 24
January 2000 TOKO, Inc.
TK14551V
CIRCUIT DESCRIPTION
Establishing Demodulation Characteristics:
Generally, demodulation characteristics of FM detectors are determined by the external phase shifter. However, this
product has a unique function which can optionally establish the demodulation characteristics by the time constant of the
circuit parts after demodulation. The following explains this concept.
Figure 8 shows the internal equivalent circuit of the detector output stage.
The multiplier output current of the detector is converted to a voltage by the internal OP AMP. The characteristic of this
stage is determined by converting the current to voltage with resistor R
0
and the capacitor C
0
connected between Pin 8
and Pin 9 (see Figure 8).
In other words, the slope of the S-curve characteristic can be established optionally with resistor R
without changing the
constant of the phase shifter. The demodulated bandwidth can be established optionally by the time constant of this
external resistor R
and capacitor C
0
inside of a bandwidth of the IF-filter and phase shifter. Figure 9 shows an example
of this characteristic.
FIGURE 8 - INTERNAL EQUIVALENT CIRCUIT OF DETECTOR OUTPUT STAGE
R0
C0
Demodulated
Output Current
Demodulated
Output Voltage
VOUT
Vref
I to V convertor
io
FIGURE 9 - EXAMPLE: BAND WIDTH OF DEMODULATION VS. TIME CONSTANT CHARACTERISTIC
V
2
MODULATING FREQUENCY fm (Hz)
1k 3k 10k 30k 100k 300k 1M
-12
-6
0
-2
-10
-8
-4
0 dB = 30.7 mVrms
C = none
C = 1000 pF
VCC = 3 V
fin = 10.7 MHz
dev. = 100 kHz
C = 330 pF
C =
47 pF
C =
10 pF
Operating Condition:
Measured by the standard test circuit.
Parallel resistor to phase shift coil = 1 k
.
f
= 10.7 MHz, modulation =
±
100 kHz.
External capacitance C
0
= 0 ~ 1000 pF.
The -3 dB frequency Fc is calculated by the following:
The S-curve output voltage is calculated by the following
as centering around the internal reference voltage V
ref
:
V
= V
±
io X R
Where V
ref
= 1.4 V, maximum of current io =
±
100
μ
A
Fc =
1
2
π
C
0
R
0
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| TK14551VTL | FM IF DETECTOR/AMPLIFIER |
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相關代理商/技術參數 |
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|---|---|
| TK14551V/14551 | 制造商:TOKO 制造商全稱:TOKO, Inc 功能描述:FM IF DETECTOR/AMPLIFIER |
| TK14551VTL | 制造商:TOKO 制造商全稱:TOKO, Inc 功能描述:FM IF DETECTOR/AMPLIFIER |
| TK14552V | 制造商:TOKO 制造商全稱:TOKO, Inc 功能描述:Wide band AM / ASK IF IC for ETC |
| TK14583V-G | 制造商:TOKO 制造商全稱:TOKO, Inc 功能描述:Wide band FM IF IC for remote keyless entry / tire pressure monitoring system |
| TK14583VTL-G | 制造商:TOKO 制造商全稱:TOKO, Inc 功能描述:Wide band FM IF IC for remote keyless entry / tire pressure monitoring system |
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