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| 型號： | TK14584 |
| 廠商： | TOKO Inc. |
| 英文描述： | FM IF IC |
| 中文描述： | 調(diào)頻中頻集成電路 |
| 文件頁數(shù)： | 14/20頁 |
| 文件大?。?/td> | 196K |
| 代理商： | TK14584 |
Page 14
January 2000 TOKO, Inc.
TK14584
The RSSI output is a current output. It converts to a voltage by an external resistor between Pin 11 and GND. The time
constant of the RSSI output is determined by the product of the external converting resistance and parallel capacitance.
When the time constant is longer, the RSSI output is less likely to be influenced by a disturbance or component of amplitude
modulation, but the RSSI output response is slower. The external resistance and capacitance are determined by the
application.
The slope of the RSSI curve characteristic can be modified by changing the external resistance. In this case, the maximum
range of converted RSSI output voltage is GND level to about V
CC
- 0.2 V (the supply voltage minus the collector saturation
voltage of the output transistor).
In addition, the temperature characteristic of the RSSI output voltage can be modified by changing the temperature
characteristic of the external resistor. Normally, the temperature characteristic of the RSSI output voltage is very stable
when using a carbon resistor or metal film resistor with a temperature characteristic of 0 to 200 ppm/
°
C.
The RSSI output is trimmed individually for enhanced accuracy.
AM Demodulation by Using the RSSI Output:
Although the distortion of the RSSI output is high because it is a logarithmic detection of the IF input envelope, AM can
be demodulated simply by using the RSSI output. In this case, the input dynamic range that can demodulate AM is the
inside of the linear portion of the RSSI curve characteristic (see Figure 3B).
This method does not have a feedback loop to control the gain because an AGC amplifier is not necessary (unlike the
popularly used AM demodulation method). Therefore, it is a very useful for some applications because it does not have
the response time problem.
Figure 3A shows the AM demodulated waveform.
CIRCUIT DESCRIPTION (CONT.)
VCC
RSSI- OUT
Current-to-Voltage
Transformation Resistor
OUTPUT
CURRENT
FIGURE 2 - RSSI OUTPUT STAGE
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| TK14584M | FM IF IC |
| TK14584MTL | FM IF IC |
| TK14588 | FM IF IC |
| TK14588V | FM IF IC |
| TK14588VTL | FM IF IC |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TK14584M | 制造商:TOKO 制造商全稱:TOKO, Inc 功能描述:FM IF IC |
| TK14584M/584 | 制造商:TOKO 制造商全稱:TOKO, Inc 功能描述:FM IF IC |
| TK14584MTL | 制造商:TOKO 制造商全稱:TOKO, Inc 功能描述:FM IF IC |
| TK14588 | 制造商:TOKO 制造商全稱:TOKO, Inc 功能描述:FM IF IC |
| TK14588V | 制造商:TOKO 制造商全稱:TOKO, Inc 功能描述:FM IF IC |
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