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DSB75 Development Support Board Rev. B1 Hardware Description

Strictly confidential / Released

DSB75_hd_v08 Page 82 of 94 29.09.2005

Parameters Condition Min. Typical Max. Unit

Ignition via VBUS line

@USB-Interface

min = 4V

signal

~~~

|________|

~~~~~~~~~~~~~~~

|  1s |  0.5s |

Rise time  1ms

Low high transition of this signal switches the module on.

RF attenuation Adapter between RF

connector X505 (type

Hirose U.FL-R-SMT)

and RF connector X506

(type SMA)

0.1 0.2 dB 0.1

Antenna

Frequency range

GSM 850

GSM 900

GSM 1800

GSM 1900

824

880

1710

1850

894

960

1880

1990

MHz

Antenna VSWR 2:1

Antenna gain 0 dBd

Dimensions of

DSB75 PCB

Depth

Width

Height with feet

177

160

Weight 240 g

Although the provided antenna is rated for a frequency range from 890MHz to

1990MHz (2170MHz), its coverage also includes the 850MHz frequency band,

sufficient ground plane and mounting provided.

7.1 Cable Requirements

The DSB75 has been tested and approved for use with a maximum cable length of 3m for

following interfaces:

- USB interface (shielded)

- Serial interfaces COM1 to COM3 (RS232)

- Power supply

- Charger

- Analog audio interface

- Antenna interface

- ADC inputs

- DAC output

It is recommended to keep the digital lines for I²C-, SPI- and DAI- interfaces as short as

possible.

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