Baseband - Rf Interface; Internal Signals And Connections; Audio - Nokia RH-18 Manual

CCS Technical Documentation
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

Signal
MIC1P (Differential input P)
MIC1N (Differential input N)
MICB1 (Microphone Bias)
External loading of MICB1
Signal
Output voltage swing
Load Resistance (EARP to EARN)
Load Capacitance (EARP to EARN)
Table 13:
Issue 1 10/03
Company confidential
Min. Nom
- 5mV
- 5mV
2.0 V 2.1 V
- -
Table 12: Internal microphone
Min.
4.0
26
-
Internal speaker (Differential output EARP & EARN)
Nokia Corporation.
Max Condition
- G=0dB
- G=0dB
2.25 V DC
600uA DC
Nom Max Units
- - Vpp
32 - W
- 50 NF
RH-18/36/38
Engine module
Note
1kΩ to MIC1B
(RC filtered by 220R/4.7uF)
1kΩ to GND
Note
Differential output
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