Altec GSM SOCKET AL7020S - Manual (Page 26)

AL7020S, AL7024S Designer’s Guide
Doc. No. DG_7024E Altec Electronic AG Seite 26 / 32
6. Locate cables and connectors so as to avoid coupling from high frequency circuits.
7. If a mulilayer board design is used, make no cuts in the ground or power planes
and be sure the ground plane covers all traces.
8. Minimize the number of through-hole connections on traces carrying high
frequency signals.
9. Avoid right angle turns on high frequency traces. Forty-five degree corners are
good, however, radius turns are better
5.1.1 Grounding
Pins 26 and 41 are for grounding. Connect all of them to the same ground-layer or a
big ground-area on your board. The ground-area should completely cover the area
below and around the module and the regulator. Make the connections as wide as
possible. For better RF-perfomance, connect the metal-housing to ground, very near
the ground-pins of the module.
5.1.2 Power Supply 5V (5V Models)
A power supply with 5.0V DC +/- 5% (5V models) and a minimum power of 1.5A is
strictly required to supply this module. The supply-regulator should be placed as close
to the module as possible (about 5cm or nearer). The 5V-trace between regulator and
module should be at least 2.5mm wide or better an entire layer.
Important:
The module draws up to 1.3A max. for 577µs every 4,6ms at GSM transmit level
PCL5 (2W). Therefore a regulator with fast transient response and good load
regulation is strongly recommended.
Peak 1.3 A
Current
Measurement
@ PCL 5