MGCM02 Datasheet, PDF (1/21 Pages) Zarlink Semiconductor Inc – TDMA/AMPS IF and Baseband Interface

MGCM02
TDMA/AMPS IF and Baseband Interface
Data Sheet
Features
• Complete IF to Baseband for IS136
• 100dB Gain Control
• Channel Filtering (30kHz)
• FM Demodulator
• RSSI Output
• Dual IF Synthesisers
• Fully Programmable via serial bus
• 3 Volt operation
• 49 Ball BGA package (7 x 7 mm)
Applications
• Dual Mode TDMA/AMPS Mobile telephones
• Dual Band (PCS1900/900) TDMA/AMPS Mobile
telephones
• PCS 1900 TDMA Mobile Telephones
Description
The MGCM02 provides the complete IF to baseband
I and Q including channel filtering for IS136/AMPS.
The receive input is at an IF frequency up to
200MHz. This is downconverted to an internal IF of
Ordering Information
MGCM02/KG/BP1N
MGCM02/KG/BP1Q
April 2003
60kHz and filtered by a switched capacitor bandpass
filter which also provides image rejection. The 60kHz
signal is then demodulated to give baseband I and Q
signals. Over 100dB of gain control is provided. 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 MGCM02 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.
IF IP+,-
LO +
LO -
Receive Section
60kHz
Σ
90Î
60kHz
To Rx PLL
FM
Discrim
RSSI
RXI OP+,-
RXQ OP+,-
AUDIO FB
AUDIO
RSSI FB
RSSI
TX
IIP+,-
TXQ
IP+,-
Transmit Section
Tx FM
TXI
OP+,-
TXQ
OP+,-
SCLK
SDATA
SLATCH
Control
RESETB
PCA
Synthesisers
Rx
VCO
Rx PD
Rx
Rx LOCK
Tx
VCO
Tx LOCK
Tx
Tx PD
Figure 1 - Block Diagram
1