CCS Technical Documentation Engine module
Company confidential RH-18/36/38
Issue 1 10/03 Nokia Corporation. Page 17
Baseband – RF interface
The interface between the baseband and the RF can be divided into three categories:
- The digital interface from the UPP to the RF ASIC (Mjoelner). The serial digital interface
is used to control the operation of the different blocks in the RF ASICs.
- The analogue interface between UEM and the RF. The analogue interface consists of RX
and TX converter signals. The power amplifier control signal TXC and the AFC signal
comes as well from the UEM.
- Reference clock interface between Mjoelner and UPP which supplies the 26Mhz system
clock for the UPP.
Internal Signals and Connections
The tables below describe internal signals. The signal names can be found on the sche-
matic for the PWB.
Audio
Table 12: Internal microphone
Table 13:
Internal speaker (Differential output EARP & EARN)
Signal Min. Nom Max Condition Note
MIC1P (Differential input P) - 5mV - G=0dB 1kΩ to MIC1B
(RC filtered by 220R/4.7uF)
MIC1N (Differential input N) - 5mV - G=0dB 1kΩ to GND
MICB1 (Microphone Bias) 2.0 V 2.1 V 2.25 V DC
External loading of MICB1 - - 600uA DC
Signal Min. Nom Max Units Note
Output voltage swing 4.0 - - Vpp Differential output
Load Resistance (EARP to EARN) 26 32 - W
Load Capacitance (EARP to EARN) - - 50 NF
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