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DSB75 Development Support Board Rev. B1 Hardware Description

Strictly confidential / Released

DSB75_hd_v08 Page 79 of 94 29.09.2005

7 Technical Data of DSB75

Table 32: DSB75 maximum ratings

Parameter Condition Min. Max. Unit

Supply voltage Laboratory PSU -30 +30 V

Operating temperature +15 +35 °C

Storage temperature -40 +85 °C

Table 33: DSB75 technical data

Parameters Condition Min. Typical Max. Unit

Supply current peak 1 A

Supply current

average

Laboratory PSU at 9V

requirements during

GSM transmission

300 400 mA

Supply voltage 8.5 9.0 15 V

Nominal supply voltage

for the GSM module

(adjustable)

2.85 4.1 *) 4.55 V

Minimum supply

voltage for GSM

module (adjustable)

2.85 3.5*) 4.55 V

BATT+

output voltage

*) for module MC75,

adjusted values

dependent on module

hardware

Maximum supply

voltage for GSM

module

4.45 4.5 4.55 V

VEXT

Switched logic high

level voltage (on if

GSM module on)

max = 50mA

2.75 2.93 3.05 V

3V0

Supply voltage for

DSB75 circuits

2.95 2.975 3.00 V

VDD

Supply voltage for the

pull-up resistors and

external use

max = 50mA

2.8 2.9 3.0 V

+5V

Audio interface supply

voltage

Audio interface supply

voltage

4.75 5.0 5.25 V

1 2 ... 74 75 76 77 78 79 80 81 82 83 84 ... 93 94

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