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參數(shù)資料
| 型號(hào)： | TR5100 |
| 英文描述： | Walkie-Talkie. hand Free |
| 中文描述： | 對(duì)講機(jī)。手免費(fèi) |
| 文件頁(yè)數(shù)： | 8/9頁(yè) |
| 文件大?。?/td> | 113K |
| 代理商： | TR5100 |
TR5100
the wireless IC company
Page 8
June 2001
Speaker Amp
After demodulation, audio signal can be obtained from the pin “AFOUT”. That signal
swing however is very small, and an operational amplifier must be added to increase the
signal swing. The Speaker Amp gain can be adjusted by applying external resistive feed-
back. A class AB output buffer have to be added at the output of the Speaker Amp “SPK-
OUT+” & “SPKOUT-” to decrease distortion of the audio signal.
Bandgap Reference
A bandgap reference provides precise biasing of the entire chip over temperature.
Mic-Amp
The Mic-Amp is used to increase the swing of input audio signal which could be limited
by two diodes in 1.4V
PP
. The Mic-Amp gain can also be adjusted by applying external
resistive feedback.
Variable Reactance
A varactor is featured in this block to allow modulation of the TX oscillator.
Trippler
FM modulation is imparted to the TX oscillator at the fundamental frequency (f
o
). The
modulated signal (f
o
) is then multiplied to the higher transmit frequency (3f
o
) by this trip-
pler circuit.
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