LT5506EUF Linear Technology, LT5506EUF Datasheet

IC DEMOD QUADRATURE VGA 16QFN

LT5506EUF

Manufacturer Part Number
LT5506EUF
Description
IC DEMOD QUADRATURE VGA 16QFN
Manufacturer
Linear Technology
Datasheet

Specifications of LT5506EUF

Function
Demodulator
Lo Frequency
80MHz ~ 1GHz
Rf Frequency
40MHz ~ 500MHz
Gain
59dB
Noise Figure
6.8dB
Current - Supply
36mA
Voltage - Supply
1.8 V ~ 5.25 V
Package / Case
16-QFN
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
P1db
-

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Company
Part Number
Manufacturer
Quantity
Price
Part Number:
LT5506EUF
Manufacturer:
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Quantity:
20 000
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Manufacturer:
LT
Quantity:
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FEATURES
TYPICAL APPLICATIO
APPLICATIO S
IF INPUT
GAIN CONTROL
280MHz
560MHz
INPUT
Wide Range 1.8V to 5.25V Supply
Frequency Range: 40MHz to 500MHz
–4dB to 59dB Variable Power Gain
THD < 0.12% (–58dBc)
at 800mV
8.8MHz I/Q Lowpass Output Noise Filters
IF Overload Detector
Baseband I/Q Amplitude Imbalance: 0.2dB
Baseband I/Q Phase Imbalance: 0.6
6.8dB Noise Figure at Max Gain
Input IP3 at Low Gain: – 0.5dBm
Low Supply Current: 27mA
Low Delay Shift Over Gain Control Range: 2ps/dB
Outputs Biased Up While in Standby
16-Lead QFN 4mm x 4mm Package with Exposed Pad
IEEE802.11
High Speed Wireless LAN
Wireless Local Loop
2xLO
3.3pF
3.3pF
C4
C5
L1
15nH
L2
15nH
10pF
C3
P-P
L3
39nH
Differential Output Level
IF
IF
V
2xLO
2xLO
+
CTRL
U
ENABLE
+
EN
STANDBY
STBY
C2
1 F
2
U
C1
1nF
GND
V
CC
1.8V
LT5506
IF DET
Q
Q
I
I
5506 TA01
OUT
OUT
OUT
OUT
+
+
DESCRIPTIO
The LT
quadrature demodulator with variable gain amplifier (VGA),
designed for low voltage operation. It supports standards
that use a linear modulation format. The chip consists of
a VGA, quadrature down-converting mixers and lowpass
noise filters. The LO port consists of a divide-by-two stage
and LO buffers. The IC provides all building blocks for IF
down-conversion to I and Q baseband signals with a single
supply voltage of 1.8V to 5.25V. The VGA gain has a linear-
in-dB relationship to the control input voltage. Hard-clip-
ping amplifiers at the mixer outputs reduce the recovery
time from a signal overload condition. The lowpass filters
reduce the out-of-band noise and spurious frequency
components. The cut-off frequency of the noise filters is
approximately 8.8MHz. The external 2xLO frequency is
required to be twice the IF input frequency for the mixers.
The standby mode provides reduced supply current and
fast transient response into the normal operating mode
when the I/Q outputs are AC-coupled to a baseband chip.
Quadrature Demodulator
, LTC and LT are registered trademarks of Linear Technology Corporation.
C3
1.8pF
®
5506 is a 40MHz to 500MHz monolithic integrated
–30
–35
–40
–45
–50
–55
–60
U
40MHz to 500MHz
–60
f
f
f
800mV
IF, 1
IF, 2
2xLO
Total Harmonic Distortion vs
IF Input Level at 1.8V Supply
IF INPUT POWER EACH TONE (dBm)
= 280MHz
= 280.1MHz
= 570MHz
–50
P-P
DIFFERENTIAL OUT
–40
with VGA
–30
LT5506
–20
5506 TA01b
–10
5506fa
1

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LT5506EUF Summary of contents

Page 1

... IF input frequency for the mixers. The standby mode provides reduced supply current and fast transient response into the normal operating mode when the I/Q outputs are AC-coupled to a baseband chip. , LTC and LT are registered trademarks of Linear Technology Corporation. 1.8V C1 1nF ...

Page 2

... P = –75dBm (Note 1.7V CTRL (Note 6) (Note 6) (Note 8) (Note 8) (Notes 6, 8) Single Ended, C 10pF LOAD P = –25.5dBm, 280MHz IF –25.5dBm, 280.1MHz (Note 7) IF ORDER PART TOP VIEW NUMBER LT5506EUF 12 STBY + 11 2xLO 17 – 10 2xLO PACKAGE 4mm) PLASTIC QFN = 125 C –5dBm (Note 5 284MHz, 2xLO IF , STBY = V , unless otherwise noted. (Note 3) ...

Page 3

ELECTRICAL CHARACTERISTICS P = –30dBm, I and Q outputs 800mV IF P-P SYMBOL PARAMETER Variable Gain Amplifier (VGA) Gain Slope Linearity Error Temperature Gain Shift Gain Control Response Time Gain Control Voltage Range Gain Control Slope Gain Control Input Impedance ...

Page 4

LT5506 W U TYPICAL PERFOR A CE CHARACTERISTICS (Note 5 284MHz –30dBm, I and Q outputs 800mV IF IF unless otherwise noted. (Note 3) Supply Current vs Supply Voltage ...

Page 5

W U TYPICAL PERFOR A CE CHARACTERISTICS (Note 5 284MHz –30dBm, I and Q outputs 800mV IF IF unless otherwise noted. (Note 3) Total Harmonic Distortion vs IF Input Power at 3V Supply and 800mV Differential ...

Page 6

LT5506 W U TYPICAL PERFOR A CE CHARACTERISTICS (Note 5 284MHz –30dBm, I and Q outputs 800mV IF IF unless otherwise noted. (Note 3) IF Detector Output Voltage vs IF Input CW Power and Supply Voltage ...

Page 7

W BLOCK DIAGRA CTRL APPLICATIO S I FOR ATIO The LT5506 consists of variable gain amplifier (VGA), I/Q demodulator, quadrature LO generator, hard clipping amplifiers (clippers), lowpass filters (LPFs) and bias ...

Page 8

LT5506 U U APPLICATIO S I FOR ATIO C3 L1 56pF 56nH IF INPUT 5.6pF 120nH 56nH Figure 1. IF Input Matching Network at 280MHz Table 1. The Component Values of Matching Network L1, L2, L3, C1, ...

Page 9

U U APPLICATIO S I FOR ATIO voltage V can be set lower than 0.2V. The normal CTRL range is from V = 0.2V to 1.7V, which results in a CTRL nominal gain range from 0.9dB to 59dB. The linear-in-dB ...

Page 10

LT5506 U U APPLICATIO S I FOR ATIO which can occur during the gain settling. It also helps to reduce the high frequency spectral content at the I/Q outputs during overload. The second order integrated lowpass filters are used for ...

Page 11

... Figure 9. Bottom Side Silkscreen of Evaluation Board 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. ...

Page 12

... Q-OUTPUTS 12 STBY 9 EN 5506 F11 BOTTOM VIEW—EXPOSED PAD 0.75 0. 0.115 0.55 0.20 TYP 15 16 2.15 0.10 (4-SIDES) 0.200 REF 0.30 0.05 0.00 – 0.05 0.65 BSC LT/TP 1003 1K REV A • PRINTED IN USA LINEAR TECHNOLOGY CORPORATION 2002 1 2 (UF) QFN 0503 5506fa ...

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