HFA3925
Data Sheet
July 1998
File Number 4132.4
2.4GHz - 2.5GHz 250mW Power Amplifier
Features
• Highly Integrated Power Amplifier with T/R Switch
• Operates Over 2.7V to 6V Supply Voltage
™
The Intersil 2.4GHz PRISM™ chip set
is a highly integrated five-chip solution
for RF modems employing Direct
• High Linear Output Power (P
1dB
: +24dBm)
Sequence Spread Spectrum (DSSS)
signaling. The HFA3925 2.4GHz-
2.5GHz, 250mW power amplifier is one of the five chips in
the PRISM™ chip set (see the Typical Application Diagram).
• Individual Gate Control for Each Amplifier Stage
• Low Cost SSOP-28 Plastic Package
The Intersil HFA3925 is an integrated power amplifier with
transmit/receive switch in a low cost SSOP 28 plastic
package. The power amplifier delivers +27dB of gain with
high efficiency and can be operated with voltages as low as
2.7V. The power amplifier switch is fully monolithic and can
be controlled with CMOS logic levels.
Applications
• Systems Targeting IEEE 802.11 Standard
• TDD Quadrature-Modulated Communication Systems
• Wireless Local Area Networks
• PCMCIA Wireless Transceivers
• ISM Systems
The HFA3925 is ideally suited for QPSK, BPSK or other
linearly modulated systems in the 2.4GHz Industrial,
Scientific, and Medical (ISM) frequency band. It can also be
used in GFSK systems where levels of +25dBm are
required. Typical applications include Wireless Local Area
Network (WLAN) and wireless portable data collection.
• TDMA Packet Protocol Radios
• PCS/Wireless PBX
Ordering Information
REMEMBER: Always apply Negative power to the VG
TEMP.
PKG.
NO.
o
pins before applying the Positive V
bias. Failure to do
DD
PART NUMBER RANGE ( C)
PACKAGE
28 Ld SSOP
so may result in the destruction of the HFA3925 Power
Amplifier.
HFA3925IA
-40 to 85
-40 to 85
M28.15
HFA3925IA96
Tape and Reel
Pinout
Functional Block Diagram
HFA3925
(SSOP)
TOP VIEW
T/R CNTRL
V
(+)
V
(-)
DDX
GX
GND
GND
1
2
28 GND
27
V
TR
DD
STAGE BIAS CONTROL
3
26 T/R CNTRL
25 RF OUT
24 GND
GND
RX OUT
GND
4
5
GND
V
6
23 DD3
GND
7
22 GND
21 GND
20 GND
19 GND
GND
RF IN
8
RX OUT
RF_OUT
TO
ANTENNA
STAGE 1 STAGE 2 STAGE 3
9
V
G2
10
11
12
13
14
GND
18
17
V
V
V
DD2
DD1
GND
G3
16 GND
15 RF IN
GND
V
G1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
http://www.intersil.com or 407-727-9207 | Copyright © Intersil Corporation 1999
2-179
PRISM® is a registered trademark of Intersil Corporation. PRISM logo is a trademark of Intersil Corporation.