Specifications

Wireless CPU

Q24 Series

Interfaces

Uripp

VBATT

Uripp

T = 4,615 ms

t = 577 µs

Figure 2: Power supply during burst emission

Two different inputs are provided for the power supply:

• VBATT is used to supply the RF part and

• VDD is used to supply the baseband part.

VBATT: Directly supplies the RF components with 3.6 V. It is essential to keep a

minimum voltage ripple at this connection in order to avoid any phase error. In

particular, VBATT supplies the RF Power Amplifier.

The current waveform is bursted with the following duty cycles:

• 1/8 of the time (around 577 µs every 4.615 ms for GSM/GPRS class 2),

• 2/8 of the time (around 1154 µs every 4.615 ms for GSM/GPRS class 10).

The rising time is around 10 µs.

VDD: Supplies the +2.8 V ballast regulators of the Wireless CPU

Q24 Series. It is

essential to keep the voltage over 3.1 volts at any time.

Notes:

• It is possible to connect VBATT and VDD together.

• In the event of separate power supply, they must be in same state: e.g. either

active or inactive at the same time.

GND: The grounding connection of the Wireless CPU

Q24 Series is made through

the shielding " The four "legs" must be soldered to a complete ground plane.

The power supply voltage for VBATT and VDD is given below:

Power supply pin-out

Signal Pin number

VBATT 55,57,58,59,60

VDD 11

GND Shielding legs

This document is the sole and exclusive property of WAVECOM. Not to be distributed or divulged without

prior written agreement.

WM_PGM_Q24NG_PTS_001-005

November 20, 2007