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PDF HFA3726IN Data sheet ( Hoja de datos )
| Número de pieza | HFA3726IN | |
| Descripción | 400MHz Quadrature IF Modulator/Demodulator | |
| Fabricantes | Intersil Corporation | |
| Logotipo |  |
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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
RSSI1
RSSI2
IF
MOD_LO_IN
MOD_LO_OUT
LO_GND
MOD_TX_IF_OUT
2V
REF
IF
÷ 2 0o/90o
I
M
U
X
M
U
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.
1-888-INTERSIL or 321-724-7143 | Copyright © Intersil Corporation 1999
PRISM® is a registered trademark of Intersil Corporation. PRISM logo is a trademark of Intersil Corporation.
1 page  
HFA3726
Pin Description (Continued)
PIN SYMBOL
DESCRIPTION
35 Mod_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
Mod_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
Mod_TXI+
In phase modulator non inverting input. AC coupling is required. This input is normally coupled to the Low pass
filter positive output (LPF_TXI+), pin 26.
38
Mod_TXI-
In phase modulator inverting input. AC coupling is required. This input is normally coupled to the Low pass filter
negative output (LPF_TXI-), pin 25.
39 Mod_TXQ+ Quadrature modulator non inverting input. AC coupling is required. This input is normally coupled to the Low pass
filter positive output (LPF_TXQ+), pin 24.
40
Mod_TXQ-
Quadrature modulator inverting input. AC coupling is required. This input is normally coupled to the Low pass filter
negative output (LPF_TXQ-), pin 23.
41 Mod_TX_PE Digital input control to enable the Modulator section. Enable logic level is High for transmit.
42 Mod_TX_IF_Out Modulator open collector output, single ended. Termination resistor to VCC with a typical value of 316Ω.
43 Mod_RX_PE Digital input control to enable the demodulator section. Enable logic level is High for receive.
44 Mod_LO_In Single ended local oscillator current input. Frequency of input signal must be twice the required modulator carrier
(2XLO)
and demodulator LO 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 3)
NOTE: High second harmonic content input waveforms may degrade I/Q phase accuracy.
45
Mod_VCC
Modulator/Demodulator supply pin. Use high quality decoupling capacitors right at the pin.
46 Mod_LO_Out Divide by 2 buffered output reference from “Mod_LO_in” input. Used for external applications where the modulating
and 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, otherwise tie to VCC.
47
Mod_VCC
Modulator/Demodulator supply pin. Use high quality decoupling capacitors right at the pin.
48 Mod_IF_In+ Demodulator non inverting input. Requires AC coupling.
49
Mod_IF In-
Demodulator inverting input. Requires AC coupling.
50
LO_GND
When grounded, this pin enables the LO buffer (Mod_LO_Out). When open (NC) it disables the LO buffer.
51, 52,
53
GND
Ground. Connect to a solid ground plane.
54
LIM2_PE
Digital input control to enable the limiter amplifier 2. Enable logic level is High.
55
LIM2_VCC
Limiter amplifier 2 supply pin. Use high quality decoupling capacitors right at the pin.
56
LIM2_Out-
Positive output of limiter amplifier 2. Requires AC coupling.
57
LIM2_Out+
Negative output of limiter amplifier 2. Requires AC coupling.
58
GND
Ground. Connect to a solid ground plane.
59
RSSI_RL2
Load resistor to ground. Nominal value is 6kΩ. This load is used to terminate the LIM RSSI current output and
maintain temperature and process variation to a minimum.
60 LIM2_RSSI Current output of RSSI for the limiter amplifier 2. Connect in parallel with the RSSI output of the amplifier limiter 1
for cascaded response.
61 LIM2_BYP+ DC feedback pin for Limiter amplifier 2. Requires good decoupling and minimum wire length to a solid signal
ground.
62
LIM2_In+
Non inverting analog input of Limiter amplifier 2.
63
LIM2_In-
Inverting input of Limiter amplifier 2.
64 LIM2_BYP- DC feedback pin for Limiter amplifier 2. Requires good decoupling and minimum wire length to a solid signal
ground.
5
5 Page 
HFA3726
Typical Performance Curves, Modulator (Figure 23 Test Diagram)
10mA/DIV.
10dB/DIV.
-7
90mA
85o
25o
-40o
10mA
2.5 4.0 5.5
VCC
FIGURE 12. MODULATOR SUPPLY CURRENT vs VCC AND
TEMPERATURE
0.5dB/DIV.
-5
85o
25o
-40o
BW = 100kHz
VBW = 30kHz
274MHz
280MHz
FREQUENCY
286MHz
FIGURE 13. TYPICAL SSB MODULATOR RESPONSE (NOTE
13 ON AC ELECTRICAL SPECS, MODULATOR
PERFORMANCE TABLE, LO BUFFER ENABLED)
1dB/DIV.
+5dB
EXPECTED VARIATION
0dB WINDOW
-10
2.5 4.0 5.5
VCC
FIGURE 14. MODULATOR SSB OUTPUT POWER vs VCC AND
TEMPERATURE
1dB/DIV.
+5dB
EXPECTED VARIATION
0dB WINDOW
-5dB
2.5
4.0
VCC
5.5
FIGURE 15. MODULATOR SSB SIDE BAND SUPPRESSION
VARIATION vs VCC AND TEMPERATURE
0.5dB/DIV.
-13
85o
25o
-15.5
-40o
-5dB
2.5
4.0
VCC
5.5
FIGURE 16. MODULATOR LO LEAKAGE VARIATION vs VCC
AND TEMPERATURE
11
-18
2.5
4.0
VCC
5.5
FIGURE 17. MODULATOR LO OUTPUT POWER
(FUNDAMENTAL) vs VCC AND TEMPERATURE
11 Page | ||
| Páginas | Total 21 Páginas | |
| PDF Descargar | [ Datasheet HFA3726IN.PDF ] | |
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