MC45 Hardware Interface Description
P R E L I M I N A R Y
MC45_HD_01_V00.02a
Page 79 of 90
12.08.2002
6.4.1 Current consumption during transmit burst
The diagrams provided in Figure 38 and Figure 39 illustrate the typical current consumption
of the application caused during a transmit burst. The typical peak current is shown vs. the
power level for 900 MHz, 1800 MHz and 1900 MHz and vs. the return loss of the antenna.
Test conditions: All measurements have been performed at T
amb
= 25°C, V
BATT+ nom
= 4.1V.
The reference points used on MC45 are the BATT+ and GND contacts (test points are
shown in Figure 29). All curves are for one TX slot, that is, for example, a voice call, CSD
call or Class 8 GPRS. Figures for Class 10 GPRS activities will be published in later releases
of this document.
Changing the conditions, e.g. in terms of temperature or voltage, will cause different results.
The current will be maximized when the maximum supply voltage is used together with a
total reflection at the RF interface.
Test conditions: T
amb
= 25°C, V
BATT+ nom
= 4.1V measured at TP BATT+ and GND, 1 TX slot
Figure 38: Typical current consumption vs. power level
PCS
0
200
400
600
800
1000
1200
0
2
4
6
8
10
12
14
16
Power Level
Bu
rs
t Cu
rre
n
t (m
A)
PCN
0
200
400
600
800
1000
1200
1400
0
2
4
6
8
10
12
14
16
Power Level
Bu
rs
t Cu
rre
n
t (
m
A)
GSM
0
200
400
600
800
1000
1200
1400
1600
1800
5
7
9
11
13
15
17
19
21
Power Level
Bu
rs
t Cu
rre
n
t (
m
A)
PCS
0
20
40
60
80
100
120
140
160
180
200
0
2
4
6
8
10
12
14
16
Power Level
Av
g
Cu
rre
n
t (m
A)
PCN
0
50
100
150
200
250
0
2
4
6
8
10
12
14
16
Power Level
Av
g
Cu
rre
n
t (m
A)
GSM
0
50
100
150
200
250
300
5
7
9
11
13
15
17
19
21
Power Level
Av
g
Cu
rre
n
t (
m
A)
