Back-Up Battery Interface Connections And Electrical Characteristics; Rf Description; Introduction To Receiver Functionality - Nokia RM-42 Service Manual

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• Common mode voltage is a mean value of high and low states of one single-ended signal.
• Differential voltage swing is differential amplitude between signals of differential pair.
• Differential transitions should be only measured with good equipment (bandwith > 1GHz),
otherwise results will seem too slow.
Table 32 Camera system regulators IF electrical characteristics
Description Parameter
Vcam1V5 VOH
regulator
enable
Vcam1V5 VOL
regulator
enable
Vcam2V8 VOH
regulator
enable
Vcam2V8 VOL
regulator
enable

Back-up battery interface connections and electrical characteristics

Pin name I/O
L2207, VBack ->
Description Parameter
Back-Up Vback
Battery Voltage

RF description

Introduction to receiver functionality

Receiver functions are implemented in RF ASIC N7500.
The receiver is a linear direct conversion receiver consisting of separate front ends (LNA and demodulator) for
each supported system.
After the demodulators, the signal paths are combined to one common BB path.
Page 9–46
Min Typ
Table 33 Back-up battery connections
Connection
Retu, VBack
Table 34 Back-up battery electrical characteristics
Min
0
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Max
Notes
Back-up battery G2200 is connected to RETU via
coil
Typ Max
2.5 2.7
System Module
Unit Notes
V Helen3 GPIO
High-level
output
voltage
V Helen3 GPIO
Low-level
output
voltage
V Helen3 GPIO
High-level
output
voltage
V Helen3 GPIO
Low-level
output
voltage
Unit
V
9241872 (Issue 1)
RM-42