MGCM01
TDMA/AMPS Baseband Interface
DS2497
ISSUE 3.3
December
2002
Features
q
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Ordering Information
MGCM01/KG/TP1N
IS136 TDMA/AMPS Compatible
Channel Filtering (30kHz)
FM Demodulator
RSSI Output
Dual IF Synthesisers
Flexible Power Control
Fully Programmable via Serial Bus
3 Volt operation
48-pin TQFP package
Applications
q
Dual Mode TDMA/AMPS Mobile Telephones
q
Dual Band (PCS1900/900) TDMA/AMPS
The inputs for the receive path are I and Q signals at an IF
of 60kHz. The I and Q signals are filtered by a 60kHz
switched capacitor bandpass filter and are then
demodulated to give baseband I and Q signals. The
MGCM01 also provides voltage gain so that the baseband
outputs can be input directly to an A to D converter.
The internal FM discriminator can be used for demodulating
AMPS signals; the receive path also provides RSSI.
Transmit I and Q baseband signals from D to A converters
can be input directly to the MGCM01, which provides
reconstruction filters and a variable gain buffer.
The two PLL synthesisers are used for generation of the
receive and transmit IF LO signals.
Mobile Telephones
q
PCS 1900 TDMA Mobile Telephones
Description
The MGCM01 provides channel filtering for IS136 TDMA/
AMPS mobile telephones.
RECEIVE SECTION
RXI IP1/2
13/14
4/3
RXI OP1/2
ATTENUATOR
S
RXQ IP1/2
15/16
90°
60kHz
2/1
10
ATTENUATOR
RXQ OP1/2
AUDIO FB
AUDIO
RSSI FB
RSSI
SCLK
SDAT
SLATCH
RESET
PCA
43
39
44
46
45
CONTROL
FM
DISCRIMINATOR
RSSI
9
11
7
28
TXI IP1/2
TXQ IP1/2
33/32
TX FM
TXI OP1/2
TXQ OP1/2
36/35
TRANSMIT
SECTION
29/30
26/27
RX VCO
UHF LOCK
TX VCO
20
25
22
SYNTHESISERS
18
RX PD
LOCK DET
TX PD
RX
LOCK
SELECT
TX
38
24
Figure 1 - MGCM01 block diagram
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