LT5502EGN Linear Technology, LT5502EGN Datasheet

IC DEMOD IF QUADRATURE 24-SSOP

LT5502EGN

Manufacturer Part Number
LT5502EGN
Description
IC DEMOD IF QUADRATURE 24-SSOP
Manufacturer
Linear Technology
Datasheet

Specifications of LT5502EGN

Function
Demodulator
Lo Frequency
140MHz ~ 800MHz
Rf Frequency
70MHz ~ 400MHz
Noise Figure
4dB
Current - Supply
32mA
Voltage - Supply
1.8 V ~ 5.25 V
Package / Case
24-SSOP
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Gain
-
P1db
-

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FEATURES
APPLICATIO S
TYPICAL APPLICATIO
INPUT
Single 1.8V to 5.25V Supply
IF Frequency Range: 70MHz to 400MHz
84dB Limiting IF Gain
90dB Linear RSSI Range
7.7MHz Lowpass Output Filter
Baseband I/Q Amplitude Imbalance: <0.7dB
4dB Noise Figure
Low Supply Current: 25mA
Outputs Biased Up While in Standby
Shutdown Current: 1 A
24-Lead Narrow SSOP Package
IEEE802.11
High Speed Wireless LAN
Wireless Local Loop
IF
INPUT
2XLO
ENABLE
R1
240
22nF
C3
U
IF
IF
2XLO
2XLO
EN
+
+
C2
1 F
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
2
C1
1nF
U
LT5502
GND
V
CC
2V
90
0
RSSI
Q
Q
I
I
OUT
OUT
OUT
OUT
+
+
BASEBAND
DIFFERENTIAL
I/Q OUTPUTS
DESCRIPTIO
The LT
quadrature IF demodulator. It consists of an IF limiter,
quadrature down mixers, integrated lowpass filters, and
divide-by-two LO buffers. The demodulator provides all
building blocks for demodulation of I and Q baseband
signals with a single supply voltage of 1.8V to 5.25V. The
IF limiter has 84dB small-signal gain, and a built-in receive
signal strength indicator (RSSI) with over 90dB linear
range. The input referred noise-spectral-density is
1.45nV/ Hz, which is equivalent to a 4dB noise figure
when the input is terminated with a 50
integrated lowpass output filters act as antialiasing and
pulse-shaping filters for demodulated I/Q-baseband sig-
nals. The 3dB cutoff frequency of the filters is about
7.7MHz. The VCO frequency is required to be twice the
desired operating frequency to provide quadrature local
oscillator (LO) signals to the mixers. The standby mode
provides fast transient response to the receive mode with
reduced supply current when the I/Q outputs are
AC-coupled to a baseband chip.
, LTC and LT are registered trademarks of Linear Technology Corporation.
C4
1.8pF
IF Demodulator with RSSI
5502 TA01a
®
5502 is a 70MHz to 400MHz monolithic integrated
I/Q Output Swing, RSSI Output vs IF Input Power
400MHz Quadrature
1200
1000
800
600
400
200
–85
U
–70
Final Electrical Specifications
IF INPUT POWER (dBm)
–55
–40
–25
January 2001
–10
LT5502
5502 TA01b
source. The
5
1.2
1.0
0.8
0.6
0.4
0.2
1

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LT5502EGN Summary of contents

Page 1

... ENABLE EN Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen- tation that the interconnection of its circuits as described herein will not infringe on existing patent rights. IF Demodulator with RSSI DESCRIPTIO ® ...

Page 2

... CONDITIONS Terminated 50 Source Differential Differential 10pF MAX 3dB Linearity Error Input = – 70dBm Input = 0dBm Input from –70dBm to 0dBm Input from –70dBm to 0dBm ORDER PART + NUMBER Q 24 OUT – OUT LT5502EGN GND 21 GND 2XLO – 18 2XLO RSSI 14 GND – 13 IFt = – ...

Page 3

ELECTRICAL CHARACTERISTICS P = –50dBm unless otherwise noted. (Note SYMBOL PARAMETER 2XLO f Frequency Range 2XLO P Input Power 2XLO DC Common Mode Voltage Power Supply V Supply Voltage CC I Supply Current ...

Page 4

LT5502 W U TYPICAL PERFOR A CE CHARACTERISTICS I/Q Output Swing vs IF Input Power 1200 1000 f = 70MHz IF 800 f = 280MHz IF 600 f = 400MHz IF ...

Page 5

CTIO (Pin 1): Positive Baseband Output Pin of I-Channel. OUT The DC bias voltage is V – 1.16V. This pin should not be CC shorted to ground. – I (Pin 2): Negative ...

Page 6

LT5502 U U APPLICATIO S I FOR ATIO The LT5502 consists of the following sections: IF limiter, I/Q demodulators, quadrature LO carrier generator, inte- grated lowpass filters (LPFs), and bias circuitry signal is fed to the inputs of ...

Page 7

U U APPLICATIO S I FOR ATIO The receive signal strength indicator (RSSI) is built into the IF limiter. The input IF signal is detected in a current output proportional to the IF input power. The current outputs from two ...

Page 8

LT5502 U TYPICAL APPLICATIO 51.1k 51.1k C10 C13 49 OUT LT1809CS 2 – 2.55k C12 R10 1.8pF 5.11k T1 J1 JTX-4-10T IF IN ...

Page 9

U TYPICAL APPLICATIO S Figure 4.Component Side Silkscreen of Evaluation Board Figure 5. Component Side Layout of Evaluation Board LT5502 9 ...

Page 10

LT5502 U TYPICAL APPLICATIO S 10 Figure 6.Bottom Side Silkscreen of Evaluation Board Figure 7. Bottom Side Layout of Evaluation Board ...

Page 11

PACKAGE DESCRIPTIO 0.007 – 0.0098 (0.178 – 0.249) 0.016 – 0.050 (0.406 – 1.270) * DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE ** DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD FLASH SHALL ...

Page 12

... LO, IF 560MHz SYNTHESIZER 2.7pF 2V BASEBAND 4,16,17, PROCESSOR OUTPUTS 1 2 A/D LPF BUFFER Q OUTPUTS 24 23 A/D LPF BUFFER 11 f/2 STBY 1nF 2.7pF 200 30nH 5502 TA02 5502i LT/TP 0101 2K • PRINTED IN USA LINEAR TECHNOLOGY CORPORATION 2001 ...

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