acpm-7891 Avago Technologies, acpm-7891 Datasheet - Page 15

• Manufacturer Part Number: acpm-7891
• Description: Agilent Acpm-7891 Tri-band Power Amplifier Module Egsm, Dcs And Pcs Multi-slot Gprs -
• Manufacturer: Avago Technologies

15
Figure 4 depicts the basic block
diagram of the ACPM-7891 PA
control board, Figure 5 shows the
control board layout, and Table 3
details its bill of materials.
The supporting LTC1758
demoboard is available upon
request from Linear Technology.
It has a 900 MHz and an
1800 MHz RF channel controlled
by the LTC1758. Timing signals
for TXEN are generated on the
board using a 13 MHz crystal ref-
Figure 4. Block Diagram of the ACPM-7891 PA Control Board.
68Ω
SHDN
33 pF
VBATT
VIN
RF
SHDN
GND
DAC
LTC1758
VPCA
TXEN
PCTL
VCC
TXEN
RFin EGSM
RFin
DCS/PCS
erence. The PCTL power control
pin is driven by a 10-bit DAC
and the DAC profile can be
loaded via a serial port. The se-
rial port data is stored in flash
memory which is capable of stor-
ing eight ramp profiles. The
board is supplied preloaded with
four GSM power profiles and
four DCS power profiles, cover-
ing the entire power range.
External timing signals can also
be used in place of the internal
crystal controlled timing.
26
18
RFin DCS/PCS
RFin EGSM
VAPC EGSM
VAPC DCS/PCS
2
ACPM-7891
16
RFout DCS/PCS
Vdd3 DCS/PCS
RFout EGSM
Vdd EGSM
14
4
11
7
33 pF
33 pF
2.2 pF
220 pF
33 pF
33 pF
220 pF
2.2 pF
DIRECTIONAL
DIRECTIONAL
COUPLER
COUPLER
50Ω
50Ω
DIPLEXER
RFout