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HFA3761

Description
TELECOM, CELLULAR, RF AND BASEBAND CIRCUIT, PQFP80
Categorysemiconductor    Analog mixed-signal IC   
File Size57KB,9 Pages
ManufacturerIntersil ( Renesas )
Websitehttp://www.intersil.com/cda/home/
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HFA3761 Overview

TELECOM, CELLULAR, RF AND BASEBAND CIRCUIT, PQFP80

HFA3761
TM
Data Sheet
July 1999
File Number
4236.4
400MHz AGC and Quadrature IF
Demodulator
The HFA3761 is a highly integrated
baseband converter for quadrature
demodulation applications. The
HFA3761 400MHz AGC and
quadrature IF demodulator is one of the
seven chips in the PRISM® full duplex chip set (see Typical
Application Diagram). It features all the necessary blocks for
baseband demodulation of I and Q signals. It has a two
stage integrated AGC IF amplifier with 82dB of voltage gain
and 76dB of gain control range. Baseband antialiasing and
shaping filters are integrated in the design. Four filter
bandwidths are programmable via a two bit digital control
interface. In addition, these filters are continuously tunable
over a
±20%
frequency range via one external resistor. To
achieve broadband operation, the Local Oscillator
frequency input is required to be twice the desired
frequency of demodulation. A selectable buffered divide by
2 LO output and a stable reference voltage are 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 and AGC Receive Functions
• Broad Frequency Range . . . . . . . . . . 10MHz to 400MHz
• I/Q Amplitude and Phase Balance . . . . 0.2dB, 2 Degrees
• 5th Order Programmable
Low Pass Filter . . . . . . . . . . . . . . . . . 2.2MHz to 17.6MHz
• 400MHz AGC Gain Strip . . . . . . . . . . . . . . . . . . . . . 82dB
• AGC Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75dB
• Low LO Drive Level . . . . . . . . . . . . . . . . . . . . . . . -15dBm
• Fast AGC Switching . . . . . . . . . . . . . . . . . . . . . . . . . . 1µs
• Power Management/Standby Mode
• Single Supply 2.7V to 5.5V Operation
Applications
• Wireless Local Loop
• Wireless Local Area Networks
• PCMCIA Wireless Transceivers
• ISM Systems
• CDMA Radios
• PCS/Wireless PBX
Ordering Information
PART NUMBER
HFA3761IN
TEMP.
RANGE (
o
C)
-40 to 85
PACKAGE
80 Ld TQFP
PKG. NO.
Q80.14x14
Simplified Block Diagram
DEMOD_RX_I
DEMOD_RX_Q
DEMOD_IF_IN
LPF_TUNE_1
LPF_TUNE_0
AGC1_OUT
AGC2_OUT
LPF_RX_Q
LPF_RX_I
AGC2_IN
AGC_SEL
AGC1_IN
AGC1_V
AGC
AGC2_V
AGC
DEMOD_LO_IN
DEMOD_LO_OUT
LO_GND
I
LPF_RXI_OUT
LPF_RXQ _OUT
Q
÷
2
0
o
/90
o
2V
REF
LPF_SEL0
LPF_SEL1
2V REF
4-1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 321-724-7143
|
Intersil and Design is a trademark of Intersil Corporation.
|
Copyright
©
Intersil Corporation 2000
PRISM® is a registered trademark of Intersil Corporation. PRISM logo is a trademark of Intersil Corporation.

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HFA3761 HFA3761IN
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