Nokia 2600 服务手册

ISSUE 1 09/2004

COMPANY CONFIDENTIAL

RH-59/60

7-System Module

Nokia Customer Care

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.

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Internal signals and connections

The tables below describe internal signals. The signal names can be found on the schematic
for the PWB.

Audio

Table 8: Internal microphone

Table 9:

Internal speaker (Differential output EARP & EARN)

Signal

Min.

Max

Conditi

Note

MIC1P (Differential input P)

5mV

G=0dB

Ω to MIC1B

(RC filtered by 220R/
4.7uF)

MIC1N (Differential input N)

5mV

G=0dB

Ω to GND

MICB1 (Microphone Bias)

2.0
V

2.1
V

2.25 V

External loading of MICB1

600uA

Signal

Min.

Nom

Max

Units

Note

Output voltage swing

4.0

Vpp

Differential output

Load Resistance (EARP to
EARN)

Load Capacitance (EARP to
EARN)