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| 型號： | TK14584M |
| 廠商： | TOKO INC |
| 元件分類： | 通信及網(wǎng)絡(luò) |
| 英文描述： | FM IF IC |
| 中文描述： | SPECIALTY TELECOM CIRCUIT, PDSO12 |
| 封裝： | PLASTIC, SSOP-12 |
| 文件頁數(shù)： | 17/20頁 |
| 文件大?。?/td> | 196K |
| 代理商： | TK14584M |
January 2000 TOKO, Inc.
Page 17
TK14584
CIRCUIT DESCRIPTION (CONT.)
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 8, the demodulated output current at Pin 8 is converted to the voltage by an external resistor R1
without using the internal OP AMP.
Figure 9 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.
FIGURE 6 - INTERNAL EQUIVALENT CIRCUIT OF DETECTOR OUTPUT STAGE
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
FIGURE 7 - EXAMPLE: BANDWIDTH OF DEMODULATION VS. TIME CONSTANT CHARACTERISTIC
V
2
MODULATING FREQUENCY fm (Hz)
1 3 10 30 100 300 1000
-12
-6
0
-2
-10
-8
-4
0 dB = 35.2 mVrms
C =
∞
C = 1000 pF
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
O
= 0~1000 pF.
R0
C0
Demodulated
Output Current
Demodulated
Output Voltage
VOUT
Vref
I to V convertor
io
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相關(guān)代理商/技術(shù)參數(shù) |
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| TK14584M/584 | 制造商:TOKO 制造商全稱:TOKO, Inc 功能描述:FM IF IC |
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| TK14588V | 制造商:TOKO 制造商全稱:TOKO, Inc 功能描述:FM IF IC |
| TK14588V/14588 | 制造商:TOKO 制造商全稱:TOKO, Inc 功能描述:FM IF IC |
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