HFA3783 Datasheet, PDF (1/34 Pages) Intersil Corporation – I/Q Modulator/Demodulator and Synthesizer

TM
Data Sheet
HFA3783
March 2000 File Number 4633.2
I/Q Modulator/Demodulator and
Synthesizer
The HFA3783 is a highly integrated and
fully differential SiGe baseband
converter for half duplex wireless
applications. It features all the
necessary blocks for quadrature
modulation and demodulation of “I” and “Q” baseband
signals.
It has an integrated AGC receive IF amplifier with frequency
response to 600MHz. The AGC has 70dB of voltage gain
and better than 70dB of gain control range. The transmit
output also features gain control with 70dB of range.
The receive and transmit IF paths can share a common
differential matching network to reduce the filter component
count required for single IF half duplex transceivers. A pair of
2nd order antialiasing filters with an integrated DC offset
cancellation architecture is included in the receive chain for
baseband operation down to DC. In addition, an IF level
detector is included in the AGC chain for threshold
comparison. Up and down conversion are performed by
doubly balanced mixers for “I” and “Q” IF processing. These
converters are driven by a broadband quadrature LO
generator with frequency of operation phase locked by an
internal 3 wire interface synthesizer and PLL.
The device operates at low LO levels from an external VCO
with a PLL reference signal up to 50MHz. The HFA3783 is
housed in a thin 48 lead LQFP package well suited for
PCMCIA board applications.
Simplified Block Diagram
Features
• Integrates All IF Transmit and Receive Functions
• Broad Quadrature Frequency Range . . . . . .70 to 600MHz
• 600MHz AGC IF Strip with Level Detector . . . . . . . . .69dB
• DC Coupled Baseband Interfaces
• Integrates a Receiver DC Offset Calibration Loop
• Integrated 3 Wire Interface PLL For LO Applications
• Low LO Drive Level . . . . . . . . . . . . . . . . . . . . . . . -15dBm
• Fast Transmit-Receive Switching . . . . . . . . . . . . . . . . <1µs
• Power Management/Standby Mode
• Single Supply 2.7 to 3.3V Operation
Applications
• IEEE802.11 1 and 2Mbps Standard
• Systems Targeting IEEE 802.11 11Mbps Standard
• Wireless Local Area Networks
• PCMCIA Wireless Transceivers
• ISM Systems
• TDMA Packet Protocol Radios
Ordering Information
PART
NUMBER
HFA3783IN
HFA3783IN96
TEMP. RANGE
(^oC)
PACKAGE PKG. NO.
-40 to 85
48 Ld LQFP Q48.7x7A
-40 to 85 Tape and Reel
IF_IN
IF_OUT
IF DETECTOR OUT
RECEIVE AGC
I
BASEBAND RXI
OFFSET
CAL
CAL ENABLE
Q
BASEBAND RXQ
0^o/90^oPLL MODULE
IF 2X LO / VCO IN
CHARGE PUMP OUT
3 WIRE INTERFACE
REF IN
∑
BASEBAND TX I
BASEBAND TXQ
TRANSMIT IF AGC
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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