HFA3726
Data Sheet
November 1999
File Number
4310.3
400MHz Quadrature IF
Modulator/Demodulator
The HFA3726 is a highly integrated
baseband converter for quadrature
modulation applications. It features all
the necessary functionality for
baseband modulation and
demodulation of I and Q signals. It has a two stage
integrated limiting IF amplifier with 84dB of gain and a built in
Receive Signal Strength Indicator (RSSI). “I” and “Q”
Baseband antialiasing and shaping filters are integrated in
this design. In addition, these filters are continuously tunable
over a
±10%
frequency range via one external resistor. The
modulator channel receives digital I and Q data for
processing. To achieve broadband operation, the Local
Oscillator frequency input is required to be twice the desired
frequency of modulation/demodulation. A selectable
buffered divide by 2 LO output and a stable reference
voltage is provided for convenience of the user. The device is
housed in a thin 80 lead TQFP package well suited for
PCMCIA board applications.
™
Features
• Integrates all IF Transmit and Receive Functions
• Broad Frequency Range . . . . . . . . . . . 10MHz to 400MHz
• 5th Order Low Pass Filter. . . . . . . . . . . . . . . . . . . .7.7MHz
• 400MHz Limiting IF Gain Strip with RSSI. . . . . . . . . .84dB
• Low LO Drive Level . . . . . . . . . . . . . . . . . . . . . . . -15dBm
• Fast Transmit-Receive Switching . . . . . . . . . . . . . . . . . 1µs
• Power Management/Standby Mode
• Single Supply 2.7V to 5.5V Operation
Applications
• Systems Targeting IEEE 802.11 Standard
• TDD Quadrature-Modulated Communication Systems
• Wireless Local Area Networks
• PCMCIA Wireless Transceivers
• ISM Systems
• TDMA Packet Protocol Radios
Ordering Information
TEMP.
PART NUMBER RANGE (
o
C)
HFA3726IN
HFA3726IN96
-40 to 85
-40 to 85
PACKAGE
80 Ld TQFP
80 Ld TQFP
PKG. NO.
Q80.14x14
Tape and Reel
• PCS/Wireless PBX
• Wireless Local Loop
Simplified Block Diagram
LPF_RX_Q
LPF_TUNE_1
LPF_TUNE_0
MOD_RX_I
MOD_RX_Q
LIM2_OUT
MOD_IF_IN
LIM1_OUT
LIM2_IN
LPF_RX_I
LIM1_IN
RSSI1
RSSI2
IF
IF
LPF_RXI_OUT
LPF_RXQ _OUT
MOD_LO_IN
÷
2
MOD_LO_OUT
LO_GND
MOD_TX_IF_OUT
0
o
/90
o
M
U
X
I
M
U
X
LPF_TXI_IN
∑
2V
REF
LPF_TX_I
MOD_TX_Q
Q
LPF_TXQ_IN
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 321-724-7143
|
Copyright
©
Intersil Corporation 1999
PRISM® is a registered trademark of Intersil Corporation. PRISM logo is a trademark of Intersil Corporation.
LPF_TX_Q
MOD_TX_I
2V REF
INTERSIL [ INTERSIL CORPORATION ]
