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參數(shù)資料
| 型號： | TR5100 |
| 英文描述： | Walkie-Talkie. hand Free |
| 中文描述： | 對講機。手免費 |
| 文件頁數(shù)： | 7/9頁 |
| 文件大小： | 113K |
| 代理商： | TR5100 |
TR5100
the wireless IC company
Page 7
June 2001
Functional Description
Mixer
The mixer features a double-balanced configuration and incorporates an AC-coupled
input. It is designed to work up to 150MHz. It can be used in differential or single ended
mode by connecting the input pin “RFIN-” to ground through an 1uF capacitor.
TX & RX Oscillators
Both are Colpitts oscillators. The on-chip transistor operates with a crystal and LC reso-
nant elements up to 150MHz. Series resonant and overtone crystal are used to achieve
excellent local oscillator stability. Using an overtone crystal to enhance operation, the
internal transistor bias is increased by adding an external resistor from “RXOSCE” to
ground. Typically, -10dBm of local oscillator drive is needed to adequately drive the
mixer. (please refer to the application circuit)
IF amplifier
The IF amplifier is a differential-input, single-ended output emitter-coupled pair. It is used
to provide additional gain for reducing the influence of noise from the succeeding limiter
amplifier on the total receive noise figure. The output of the IF amplifier is buffered and
has an impedance is 1.5K
. When using 455KHz ceramic filter with source and load
impedance of 1.5K
,
no external matching is needed.
RSSI
The received signal strength indicator (RSSI) output is a current proportional to the log of
the received signal amplitude. The RSSI current output is derived by summing currents
from limiting amplifier stages. The RSSI output current creates a voltage across an exter-
nal resistor at pin 31.
Limiter
The limiting amplifier consists of several dc-coupled amplifier stages. The fixed internal
input impedance is 1.5K
.
The total gain of the limiting amplifier section is approximately
75dB.
Demodulator
Following the limiting amplifier, is the demodulator. The demodulator is a double-bal-
anced four-quadrant multiplier with an external 10pF quadrature capacitor between “LIM-
OUT” & “QUAD”. The external capacitor value may be increased to increase the IF
signal at the external parallel RLC resonant circuit which provides the 90 degree phase
shift and drives the quadrature detector. A single pin “QUAD” is for the external LC par-
allel resonant network connecting to the quadrature detector.
Mute
The mute circuit is controlled by the RSSI voltage which detects received signal strength.
If the incoming signal is weak, then the mute circuit would disable the demodulator and
speaker amp output.
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