PLUTO
Dual Mode CDMA/AMPS Baseband Interface
Advance Information
DS4722 - 1.8 July 1998
The PLUTO baseband interface circuit is designed for use
in dual mode CDMA/AMPS digital cellular telephones. In the
telephone, Pluto provides the interface between the radio (RF
& IF) components and the baseband digital signal processor.
Pluto is part of a complete chipset solution for CDMA phones
entitled the Planet chipset.
The receive (RX) section converts the analog in-phase and
quadrature (I & Q) signals into equivalent digital signals whilst
the transmit (TX) circuits perform the complementary function
of translating digital baseband information into the analog
equivalent signals required for the modulator in the radio
circuits. VHF PLLS are also included for second RXLO and
TXIF generation.
PLUTO also contains a 4 channel general purpose ADC
which is included for such purposes as environmental and
signal strength monitoring.
PIN 1 IDENT
PIN 80
FEATURES
s
Dual mode AMPS/CDMA compatible
s
Low Power/Low Voltage operation
s
Standard baseband I and Q interface
s
4 Input Auxiliary ADC
s
Synthesisers
APPLICATIONS
s
Dual Mode CDMA/AMPs digital cellular
telephones
TXQ,TXQ-
FM_MOD
TXI,TXI-
TXIF PD_RX
PD_TX
RXIF
PIN 1
GP80
MP28
Figure 1 Pin connections - top view
ABSOLUTE MAXIMUM RATINGS
Supply voltage
Voltage applied to any other pin
Operating junction temperature
Storage temperature
ESD (human body model)
ORDERING INFORMATION
PLUTO/KG/GP1R
ADC<3> ADC<1>
FC_I
I+,I-
BAL
Q+,Q-
FC_Q
ADC<2> ADC<0>
-0.3 to 3.9V
-0.3 to Vcc+0.3V
150°C
-55°C to 150°C
2kV
TX
SYNTH
TCXO/4
/4
RX
SYNTH
8-BIT
DAC
8-BIT
DAC
8-BIT
DAC
ANALOG
MULTIPLEXER
S<0>
S<1>
VDD
GND
1025
CHIPx8
512
8-BIT
DAC
8-BIT
DAC
8-BIT 6-BIT
ADC ADC
6-BIT 8-BIT
ADC ADC
8-BIT
ADC
SUB
FM/
SLEEP/
IDLE/
RESET/
19.68MHz
BUFFER
tx calibration and control
rx calibration and control
SDATA
SCLOCK
TCXO
TXCLK
TXD<7:0>
RXIFMDATA
RXID<3:0>
ADCENA
ADCDATA
ADCCLK
RXQFMDATA
RXQD<3:0>
SLATCH
Figure 2 Block diagram
MITEL [ MITEL NETWORKS CORPORATION ]
