HFA3763 Datasheet, PDF (1/10 Pages) Intersil Corporation – 400MHz Quadrature Modulator and AGC

Data Sheet
HFA3763
June 1999 File Number 4237.4
400MHz Quadrature Modulator and AGC
™ The HFA3763 is a highly integrated
baseband converter for quadrature
modulation applications. The HFA3763
400MHz quadrature modulator and
AGC 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
modulation of I and Q signals. An output AGC and Baseband
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. The
modulator channel receives digital or analog 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. A selectable buffered divide by 2
LO output and a stable reference voltage are provided for
convenience of the user.
Ordering Information
TEMP.
PART NUMBER RANGE (^oC)
PACKAGE
PKG. NO.
HFA3763IN
-40 to 85 80 Ld TQFP Q80.14x14
Simplified Block Diagram
Features
• Integrates all IF Transmit Functions
• Broad Frequency Range . . . . . . . . . . . 10MHz to 400MHz
• I/Q Amplitude and Phase Balance . . . . . . . . . . . 0.2dB, 2^o
• 5th Order Programmable
Low Pass Filter. . . . . . . . . . . . . . . . . . . 2.2MHz - 17.6MHz
• 400MHz Output AGC Amplifier/Attenuator . . . . . . . .45dB
• Selectable Digital or Analog TX Baseband Inputs
• Low LO Drive Level . . . . . . . . . . . . . . . . . . . . . . . -15dBm
• Fast Transmit-on Switching . . . . . . . . . . . . . . . . . . . . . 1µs
• Power Management/Standby Mode
• Single Supply 2.7V to 5.5V Operation
Applications
• Wireless Local Loop Systems
• Wireless Local Area Networks
• PCMCIA Wireless Duplex Transceivers
• ISM Systems
• TDMA Packet Protocol Radios
• PCS/Wireless PBX
MOD_LO_OUT
LO_GND
IF_OUT
÷2 0^o/90^o
∑
2V
REF
2V REF
LPF_TXI_IN
I
LPF_TXQ_IN
Q
4-1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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