參數(shù)資料
型號: MGCM02
廠商: Zarlink Semiconductor Inc.
英文描述: TDMA/AMPS IF and Baseband Interface
中文描述: 時分多址/ AMPS二元IF和基帶接口
文件頁數(shù): 19/21頁
文件大?。?/td> 529K
代理商: MGCM02
Data Sheet
MGCM02
19
Applications Information
MGCM02 requires a minimal number of external
components in a typical application. The TCXO input
should be ac coupled using 10 nF capacitor. Internal
currents in the device are set by a reference resistor
connected from pin 48 to ground. The recommended
value for this resistor is 100k
. External components
on the discriminator and RSSI pins control the output
characteristics of these functions. The recommended
components are shown in
fi
gures 9 and 10.
Fig 11 shows the external tank circuit required for the
receive VCO. These components should be mounted
as close as possible to the device. The actual
component values will be dependent on the required
operating frequency.
The MGCM02 transmit circuits are fully compatible
with transmit products from Zarlink Semiconductor
such as MGCT02 and MGCT04.
FM Operation in Fading Environment
In a severe fading environment the FM performance
is improved by operating in the AGC mode. This
eliminates the switching transients using the
fi
xed
gain FM mode, when the gain is switched by 32.5 dB
which can cause ringing and distortion in the
bandpass
fi
lter.
The FM agc mode can be selected by setting
VGAWD in Word 8 to '110'. The RSSI switching
should be disabled by setting CONT<3> and RSS
bits to '1'
At low signal levels the gain should be set as for the
fi
xed gain FM mode (Pre-amp plus VGA = 26 dB),
and the agc loop should not be activated until the
RSSI output voItage is approximately 1.2 volts. This
maintains optimum intermodulation performance and
tolerance to 'down fades'.
130k
47p
100n
13k
AUDIO
AUDIO FB
Discriminator
Output
Figure 9 - Discrminator Output Components
27k
1.5n
RSSI
RSSI FB
RSSI
Output
Figure 10 - RSSI Output Components
tbd
22n
22p
22p
10k
10k
VHF RES
VHF RESB
From
PLL
Loop
Filter
Figure 11 - External Tank Circuit
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