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.

MP28

Figure 1 Pin connections - top view

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

ABSOLUTE MAXIMUM RATINGS

Supply voltage

-0.3 to 3.9V

Voltage applied to any other pin

-0.3 to Vcc+0.3V

Operating junction temperature

150

°C

Storage temperature

-55

°C to 150°C

ESD (human body model)

2kV

ORDERING INFORMATION

PLUTO/KG/GP1R

GP80

APPLICATIONS

s Dual Mode CDMA/AMPs digital cellular

telephones

Figure 2 Block diagram

PLUTO

Dual Mode CDMA/AMPS Baseband Interface

Advance Information

DS4722 - 1.8 July 1998

PIN 80

PIN 1 IDENT

PIN 1

RX

SYNTH

/4

1025

512

19.68MHz

BUFFER

8-BIT

DAC

8-BIT

DAC

tx calibration and control

TX

SYNTH

8-BIT

DAC

8-BIT

DAC

8-BIT

ADC

6-BIT

ADC

8-BIT

DAC

6-BIT

ADC

8-BIT

ADC

8-BIT

ADC

ANALOG

MULTIPLEXER

rx calibration and control

FM_MOD

TXQ,TXQ-

TXI,TXI-

TXIF

PD_TX

RXIF

PD_RX

FC_I

I+,I-

BAL

Q+,Q-

FC_Q

ADC<3>

ADC<2>

ADC<1>

ADC<0>

S<0>

S<1>

VDD

GND

SUB

FM/

SLEEP/

IDLE/

RESET/

ADCENA

ADCCLK

ADCDATA

RXQD<3:0>

RXID<3:0>

RXQFMDATA

RXIFMDATA

TXD<7:0>

TXCLK

TCXO

CHIPx8

TCXO/4

SDATA

SCLOCK

SLATCH