參數(shù)資料
型號(hào)： TK14588V
廠(chǎng)商： TOKO INC
元件分類(lèi)： 通信及網(wǎng)絡(luò)
英文描述： FM IF IC
中文描述： SPECIALTY TELECOM CIRCUIT, PDSO16
封裝： TSSOP-16
文件頁(yè)數(shù)： 14/20頁(yè)
文件大?。?/td> 233K
代理商： TK14588V
Page 14
January 2000 TOKO, Inc.
TK14588
CIRCUIT DESCRIPTION (CONT.)
VCC
RSSI- OUT
Current-to-Voltage
Transformation Resistor
OUTPUT
CURRENT
FIGURE 2 - RSSI OUTPUT STAGE
RSSI-OUT (V)
RF INPUT - LEVEL (dBu)
AM can be
demodulated
inside of linear
range
FIGURE 3A - AM DEMODULATED WAVEFORM
Operating Condition
V
= 3 V, f
= 10.7 MHz,
fm = 40 kHz, Mod = 80%,
V
IN
= 40 dBm
100mV/div
100
μ
s/div
The RSSI output is a current output. It converts to a voltage by an external resistor between Pin 15 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 the component of
amplitude modulation, but the RSSI output response is slower. Determine the external resistance and capacitance 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 is 0 to 200 ppm/
°
C.
This product is very accurate, because the RSSI characteristic is trimmed individually.
AM Demodulation by Using the RSSI Output:
Although the distortion of the RSSI output is high because it is a logarithmic detection of the envelope to the IF input, 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 application for some uses because it does not
have the response time problem.
Figure 3A shows the AM demodulated waveform.
FIGURE 3B
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相關(guān)代理商/技術(shù)參數(shù)
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TK14588V/14588 制造商:TOKO 制造商全稱(chēng):TOKO, Inc 功能描述:FM IF IC
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TK145J 制造商:Panasonic Electric Works 功能描述:
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TK14600M 制造商:TOKO 制造商全稱(chēng):TOKO, Inc 功能描述:NARROW BAND FM IF AMPLIFIER
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