LT5517EUF Linear Technology, LT5517EUF Datasheet

IC DEMOD QUAD 40-900MHZ 16-QFN

LT5517EUF

Manufacturer Part Number
LT5517EUF
Description
IC DEMOD QUAD 40-900MHZ 16-QFN
Manufacturer
Linear Technology
Datasheet

Specifications of LT5517EUF

Function
Demodulator
Lo Frequency
80MHz ~ 1.8GHz
Rf Frequency
40MHz ~ 900MHz
P1db
10dBm
Gain
3.3dB
Noise Figure
12.4dB
Current - Supply
110mA
Voltage - Supply
4.5 V ~ 5.25 V
Package / Case
16-QFN
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Part Number:
LT5517EUF
Manufacturer:
LT
Quantity:
10 000
Part Number:
LT5517EUF
Manufacturer:
LINEAR/凌特
Quantity:
20 000
Part Number:
LT5517EUF#PBF
Manufacturer:
LINEAR/凌特
Quantity:
20 000
Part Number:
LT5517EUF#TRPBF
Manufacturer:
LINEAR/凌特
Quantity:
20 000
Company:
Part Number:
LT5517EUF#TRPBF
Quantity:
1 321
FEATURES
TYPICAL APPLICATIO
APPLICATIO S
RF Input Frequency Range: 40MHz to 900MHz
High IIP3: 21dBm at 800MHz
High IIP2: 58dBm at 800MHz
I/Q Gain Mismatch: 0.3dB Max
I/Q Phase Mismatch: 0.7
Noise Figure: 12.4dB at 800MHz
Conversion Gain: 3.3dB at 800MHz
Baseband Bandwidth: 130MHz
Single Ended, 50 Matched 2XLO Input
Shutdown Mode
16-Lead QFN (4mm 4mm) Package
with Exposed Pad
Wireless Infrastructure
High Linearity Direct Conversion I/Q Receiver
High Linearity I/Q Demodulator
BPF
Figure 1. High Signal-Level I/Q Demodulator for 450MHz Infrastructure Receiver
LNA
ENABLE
INPUT
2xLO
BPF
U
RF
RF
2xLO
EN
+
U
2
V
5V
CC
0
90
LT5517
Q
Q
I
I
OUT
OUT
OUT
OUT
DESCRIPTIO
+
+
The LT
lator optimized for high linearity receiver applications
where high dynamic range is important. It is suitable for
communications receivers where an RF or IF signal is
directly converted into I and Q baseband signals with a
bandwidth up to 130MHz. The LT5517 incorporates bal-
anced I and Q mixers, LO buffer amplifiers and a precision,
broadband quadrature generator derived from an on-chip
divide-by-two circuit.
The superior linearity and low noise performance of the
LT5517 is achieved across its full frequency range. A well-
balanced divide-by-two circuit generates precision quadra-
ture LO carriers to drive the I mixer and the Q mixer.
Consequently, the outputs of the I-channel and the
Q-channel are well matched in amplitude, and their phases
are 90 apart. The LT5517 also provides excellent 50
impedance matching at the 2XLO port across its entire
frequency range.
Quadrature Demodulator
5517 F01
, LTC and LT are registered trademarks of Linear Technology Corporation.
LPF
LPF
®
5517 is a 40MHz to 900MHz quadrature demodu-
VGA
VGA
DSP
40MHz to 900MHz
U
–100
–20
–40
–60
–80
20
0
–18
T
P
f
f
f
2XLO
RF1
RF2
A
2XLO
I/Q Output Power, IM3, IM2
= 25 C
= 799.9MHz
= 800.1MHz
= 1602MHz
–14
= –10dBm
vs RF Input Power
RF INPUT POWER (dBm)
–10
P
OUT
LT5517
–6
IM3
IM2
–2
5517 F01b
1
5517f
2

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LT5517EUF Summary of contents

Page 1

... Consequently, the outputs of the I-channel and the Q-channel are well matched in amplitude, and their phases are 90 apart. The LT5517 also provides excellent 50 impedance matching at the 2XLO port across its entire frequency range. , LTC and LT are registered trademarks of Linear Technology Corporation LT5517 CC ...

Page 2

... Consult LTC Marketing for parts specified with wider operating temperature ranges 5V CONDITIONS Internally Matched Source Voltage Gain, Load Impedance = 1k – 2-Tone, –10dBm/Tone 200kHz 2-Tone, –10dBm/Tone 200kHz (Note 4) (Note 4) Differential U W ORDER PART TOP VIEW NUMBER LT5517EUF GND 17 10 2XLO GND 9 UF PART MARKING UF PACKAGE 5517 = 37 C 799 ...

Page 3

DC ELECTRICAL CHARACTERISTICS PARAMETER Supply Voltage Supply Current Shutdown Current Turn-On Time Turn-Off Time EN = HIGH (On LOW (Off) EN Input Current Output DC Offset Voltage + – + – – – ...

Page 4

LT5517 W U TYPICAL PERFOR A CE CHARACTERISTICS f = 800MHz –10dBm, unless otherwise noted. (Test circuit shown in Figure 2) RF 2XLO I/Q Output Power, IM3 vs RF Input Power 1602MHz f = 799.9MHz ...

Page 5

W U TYPICAL PERFOR A CE CHARACTERISTICS f = 800MHz –10dBm, unless otherwise noted. (Test circuit shown in Figure 2) RF 2XLO RF-LO Isolation vs RF Input Power 120 110 f = 40MHz RF 100 ...

Page 6

LT5517 W BLOCK DIAGRA + RF 2 – I-MIXER 0 RF AMP LO BUFFERS 2 90 Q-MIXER BIAS GND ...

Page 7

TEST CIRCUIT R2 J1 MABAES0054 0 RF C10 3.3pF Figure 3. Component Side Silkscreen of Evaluation Board J3 – I OUT C15 C14 10pF 10pF OUT C16 C13 10pF 10pF 1nF ...

Page 8

LT5517 U U APPLICATIO S I FOR ATIO The LT5517 is a direct I/Q demodulator targeting high linearity receiver applications. It consists ampli- fier, I/Q mixers, a quadrature LO carrier generator and bias circuitry. The RF signal ...

Page 9

U U APPLICATIO S I FOR ATIO Table 2. RF Input Differential Impedance FREQUENCY DIFFERENTIAL INPUT (MHz) IMPEDANCE ( ) 40 240.1-j10.3 100 245.5-j25.9 200 236.8-j50.0 300 223.6-j70.5 400 207.9-j86.3 500 190.6-j98.1 600 173.2-j105.8 700 156.2-j110.2 800 141.2-j111.8 900 129.5-j114.5 ...

Page 10

LT5517 U U APPLICATIO S I FOR ATIO approach is to terminate each output with a shunt capaci- tor. The capacitor value can be optimized depending upon the operating frequency and the specific PCB layout. The phase relationship between the ...

Page 11

... MOLD FLASH. MOLD FLASH, IF PRESENT, SHALL NOT EXCEED 0.15mm ON ANY SIDE 4. EXPOSED PAD SHALL BE SOLDER PLATED 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. U ...

Page 12

... Multiband GSM/DCS/GPRS Mobile Phones Multiband GSM/DCS/GPRS Phones, 45dB Dynamic Range, 450kHz Loop BW Multiband GSM/DCS/GPRS Phones, 45dB Dynamic Range, 250kHz Loop BW Multiband GSM/GPRS/EDGE Mobile Phones www.linear.com Offset Control, Adjustable Gain and Offset LT/TP 0104 1K • PRINTED IN USA LINEAR TECHNOLOGY CORPORATION 2004 5517f ...

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