HFA3726 Datasheet, PDF (1/21 Pages) Intersil Corporation – 400MHz Quadrature IF Modulator/Demodulator

Data Sheet
HFA3726
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.
Ordering Information
TEMP.
PART NUMBER RANGE (^oC) PACKAGE
PKG. NO.
HFA3726IN
-40 to 85 80 Ld TQFP Q80.14x14
HFA3726IN96
-40 to 85 80 Ld TQFP Tape and Reel
Simplified Block Diagram
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
• PCS/Wireless PBX
• Wireless Local Loop
LIM1_IN _IF
RSSI1
RSSI2
MOD_LO_IN
MOD_LO_OUT
LO_GND
MOD_TX_IF_OUT
2V
REF
IF
I
M
M
÷ 2 0^o/90^o
U
U
X
X
Q
∑
LPF_RXI_OUT
LPF_RXQ _OUT
LPF_TXI_IN
LPF_TXQ_IN
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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