RH-128
Baseband Description and Troubleshooting
COMPANY CONFIDENTIAL
Copyright © 2009 Nokia. All rights reserved.
Page 5-
7
Issue 1
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Support for multiple CDMA band classes (Band Class 0/US-Cellular, Band Class 1/US-PCS, Band
Class 3/JTACS, Band Class 4/Korean-PCS); support for additional band classes which can be
added upon customer request
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Special purpose logic provides signal processing, modulation, demodulation, hardware
accelerators and interfaces for keypad and display
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Mixed signal circuitry for the Rx analog-to-digital converter (ADC), Rx filter, Tx digital-to-analog
converter (DAC), Tx filter, internal PLLs, voice codec, auxiliary ADCs, auxiliary DACs, RF control
and 32.768 kHz oscillator
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Dual supply voltage (1.8 V digital core, 3.0 V analog and 3.0 V digital I/O)
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3.0 V or 1.8 V external memory interface
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USB support (12 Mbps)
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Removable User Identity Module (R-UIM) compliant with IS-820
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32-voice polyphonic ringer
The interface of the CBP 5.0 is described in the following diagram. Receive and transmit interfaces for
CBP 5.0 provides analog I and Q signals and support super-heterodyne radio and direct conversion
radio design. The CP external-memory interface supports 3.0V or 1.8V, the address bus supports 16-bit
address which can support three to six external devices via chip selects. CBP 5.0 includes 48 GPIOs
and interrupts, some of which are multiplexed with other functions. All GPIO pins are in input state by
default and use a large pull-up or pull-down resistor value to minimize the current drain. The USB port
supports data rates of up to 12Mbps, the USB analog drivers and 48.00MHz PLL are integrated into
CBP 5.0, the control processor manages the USB function. Two independent serial-peripheral interfaces
are provided on CBP 5.0: one is for RF control and the other is for general-purpose use. The R-UIM
interface supports 3V UIM cards and consists of five pins, these pins are multiplexed with another
function. The CP manages the R-UIM function.
Five independent PDM DACs are supplied on the CBP 5.0 chip.
Three of the outputs are dedicated to radio-control signals for Rx automatic gain control (AGC), Tx AGC,
and automatic frequency control (AFC). The fourth and fifth PDM outputs are spares. The PDMs are
12-bit DACs and have a guaranteed output range of 0.2 V to 2.5 V.
The 12-bit auxiliary ADC supports eight independent external channels on pins AUXADC [7:0]. There
are also eight internal channels used to measure internal analog voltages. The input voltage range is
0.2 V to 2.7 V. The conversion time is 156 µsec. The typical uses of the external auxiliary ADC channels
include: Tx RF power measurement, battery voltage, and temperature sensors.
The baseband is powered by the following PMU ACT5805 regulators:
