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PDF HFA3761 Data sheet ( Hoja de datos )
| Número de pieza | HFA3761 | |
| Descripción | 400MHz AGC and Quadrature IF Demodulator | |
| Fabricantes | Intersil Corporation | |
| Logotipo |  |
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TM
Data Sheet
HFA3761
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.
Ordering Information
TEMP.
PART NUMBER RANGE (oC) PACKAGE
HFA3761IN
-40 to 85 80 Ld TQFP
PKG. NO.
Q80.14x14
Simplified Block Diagram
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
AGC_SEL
AGC1_IN
AGC1_VAGC
AGC2_VAGC
DEMOD_LO_IN
DEMOD_LO_OUT
LO_GND
I
÷2 0o/90o
2V
REF
Q
LPF_RXI_OUT
LPF_RXQ _OUT
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.
1 page  
HFA3761
Pin Descriptions (Continued)
PIN SYMBOL
DESCRIPTION
35 DEMOD_RXQ+ Quadrature demodulator positive output. AC coupling is required. Normally connects to the non inverting input of
the Low pass filter (LPF_RXQ+), pin 28.
36 DEMOD_RXQ- Quadrature demodulator negative output. AC coupling is required. Normally connects to the inverting input of the
Low pass filter (LPF_RXQ+), pin 27.
37 NC Connected internally for test purposes. Pin must be left floating.
38 NC Connected internally for test purposes. Pin must be left floating.
39 NC Connected internally for test purposes. Pin must be left floating.
40 NC Connected internally for test purposes. Pin must be left floating.
41
GND
Ground. Connect to a solid ground plane.
42 DEMOD_VCC Supply pin for the Demodulator. Use high quality decoupling capacitors right at the pin.
43 DEM_RX_PE Digital input control to enable the demodulator section. Enable logic level is High.
44 DEM_LO_In Single ended local oscillator current input. Frequency of input signal must be twice the required demodulator LO
(2XLO)
frequency. Input current is optimum at 200µARMS. Input matching networks and filters can be designed for a wide
range of power and impedances at this port. Typical input impedance is 130Ω. This pin requires AC coupling.
NOTE: High second harmonic content input waveforms may degrade I/Q phase accuracy.
45 DEMOD_VCC Supply pin for the Demodulator. Use high quality decoupling capacitors right at the pin.
46 DEM_LO_Out Divide by 2 buffered output reference from “DEMOD_LO_in” input. Used for external applications where the
demodulating carrier reference frequency is required. 50Ω single end driving capability. This output can be
disabled by use of pin 50. AC coupling is required.
47 DEMOD_VCC Supply pin for the Demodulator. Use high quality decoupling capacitors right at the pin.
48 DEMOD_IFIN+ Demodulator, non-inverting input. Requires AC coupling.
49 DEMOD_IFIN- Demodulator, inverting input. Requires AC coupling.
50 LO_GND When grounded, this pin enables the LO buffer (DEMOD_LO_Out). When open (NC) it disables the LO buffer.
51, 52, 53
54
55
56
GND
AGC2_VCC
AGC2_Out-
AGC2_Out+
Ground. Connect to a solid ground plane.
Supply pin for the AGC amplifier 2. Use high quality decoupling capacitors right at the pin.
Positive output of AGC amplifier 2. Requires AC coupling.
Negative output of AGC amplifier 2. Requires AC coupling.
57 AGC2_PE Digital input control to enable the AGC amplifier 2. Enable logic level is High.
58 AGC2_VCC Supply pin for the AGC amplifier 2. Use high quality decoupling capacitors right at the pin.
59
GND
Ground. Connect to a solid ground plane.
60 AGC2_VAGC AGC amplifier 2, AGC control input.
61 AGC2_BYP+ DC feedback pin for AGC amplifier 2. Requires good decoupling and minimum wire length to a solid signal ground.
62 AGC2_In+ Non-inverting analog input of AGC amplifier 2.
63
GND
Ground. Connect to a solid ground plane.
64 AGC2_In- Inverting input of AGC amplifier 2.
65 AGC2_BYP- DC feedback pin for AGC amplifier 2. Requires good decoupling and minimum wire length to a solid signal ground.
66 - 73
GND
Ground. Connect to a solid ground plane.
74 AGC1_VCC AGC amplifier 1 supply pin. Use high quality decoupling capacitors right at the pin.
75 AGC1_Out- Negative output of AGC amplifier 1. Requires AC coupling.
76 AGC1_Out+ Positive output of AGC amplifier 1. Requires AC coupling.
77 AGC1_PE Digital input control to enable the AGC amplifier 1. Enable logic level is High.
78 AGC1_VCC AGC amplifier 1 supply pin. Use high quality decoupling capacitors right at the pin.
79
GND
Ground. Connect to a solid ground plane.
80 AGC1_VAGC AGC amplifier 1, AGC control input.
4-5
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