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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)： | 15/21頁 |
| 文件大?。?/td> | 529K |
| 代理商： | MGCM02 |
Data Sheet
MGCM02
15
The dc level for the baseband I and Q outputs can be
selected by RDC - Word 8 Bit 11
The VGA<2:0> - Word 8 Bits 5-3, are used to set FM
gain mode and for test purposes.
The other states are used for test purposes. In
TDMA mode VGAWD should always be set to 000.
Transmit Programming
MGCM02 has two basic transmit modes.
1. I / Q mode. I and Q signals from baseband digital
to analog converter are
fi
ltered and buffered. This
mode is used for IS136 TDMA.
2. FM Mode. This is used for direct FM modulation of
transmit IF oscillator.
These modes are controlled by TX <1:0> - Word 6
Bits 9:8
A calibration of the transmit
fi
lters can be initialised
by setting TXC - Word 6 Bit 10 to 1. After calibration
the internal register for this bit is reset to 0
The transmit gain can be programmed by TXG<2:0>
- Word 6 Bits 13:11
The dc level for the transmit I and Q outputs can be
selected by TDC - Word 8 Bit 12
Transmit Calibration
This is initiated by setting TXC - Word 6 Bit 10 high.
Calibration takes approximately 0.6ms. In order for
the calibration to give the required cutoff, CALCO -
Word 8 Bits 23:16 must be set to 00001100. The
calibration code is then stored in TC<3:0> Word 6
Bits 6:3, and TXC is reset low. If TC<3:0> is
overwritten then a further calibration is required.
LPC <1:0>
Operation
0
0
Both
fi
lters 37.5kHz cut-off
0
1
Filter 2 - 37.5kHz,
fi
lter 1 - 25kHz
1
0
Filter 2 - 25kHz,
fi
lter 1 - 37.5kHz
1
1
Both
fi
lters 25kHz cut-off
PDF <1:0>
Operation
0
0
No extra
fi
ltering
0
1
Filter 1 only
1
0
Filter 2 only
1
1
Both
fi
lters
RDC
Operation
0
Output Bias = 1.25 Volts
1
Output Bias = Vdd/2
VGAWD <2:0>
Operation
0
0
0
Standard Mode.
AGC Control for TDMA,
Fixed gain for FM
1
1
0
AGC Control for FM
TX <1:0>
Mode
0
0
TDMA
0
1
FM - Differential input
1
X
FM - Single-ended input
TXG <2:0>
Gain (dB)
X
X
1
0
0
0
0
3
0
1
0
6
1
0
0
9
1
1
0
12
TDC
Operation
0
Output Bias = 1.25 Volts
1
Output Bias = Vdd/2
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