Electronic Components Datasheet Search
  English  ▼
ALLDATASHEET.NET

X  

LT5575 Datasheet(PDF) 11 Page - Linear Technology

Part # LT5575
Description  800MHz to 2.7GHz High Linearity Direct Conversion Quadrature Demodulator
Download  16 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LT5575 Datasheet(HTML) 11 Page - Linear Technology

Back Button LT5575_15 Datasheet HTML 7Page - Linear Technology LT5575_15 Datasheet HTML 8Page - Linear Technology LT5575_15 Datasheet HTML 9Page - Linear Technology LT5575_15 Datasheet HTML 10Page - Linear Technology LT5575_15 Datasheet HTML 11Page - Linear Technology LT5575_15 Datasheet HTML 12Page - Linear Technology LT5575_15 Datasheet HTML 13Page - Linear Technology LT5575_15 Datasheet HTML 14Page - Linear Technology LT5575_15 Datasheet HTML 15Page - Linear Technology Next Button
Zoom Inzoom in Zoom Outzoom out
 11 / 16 page
background image
LT5575
11
5575f
APPLICATIONS INFORMATION
The LT5575 is a direct I/Q demodulator targeting high
linearity receiver applications, such as RFID readers and
wireless infrastructure. It consists of RF transconductance
amplifiers, I/Q mixers, a quadrature LO phase shifter, and
bias circuitry.
The RF signal is applied to the inputs of the RF
transconductance amplifiers and is then demodulated
into I/Q baseband signals using quadrature LO signals
which are internally generated from an external LO source
by precision 90° phase-shifters. The demodulated I/Q
signals are single-pole low-pass filtered on-chip with a
–3dB bandwidth of 490MHz. The differential outputs of the
I-channel and Q-channel are well matched in amplitude;
their phases are 90° apart.
Broadband transformers are integrated on-chip at both
the RF and LO inputs to enable single-ended RF and LO
interfaces. In the high frequency band (1.5GHz to 2.7GHz),
both RF and LO ports are internally matched to 50Ω. No
external matching components are needed. For the lower
frequency bands (800MHz to 1.5GHz), a simple network
with series and/or shunt capacitors can be used as the
impedance matching network.
RF Input Port
Figure 4 shows the demodulator’s RF input which con-
sists of an integrated transformer and high linearity
transconductance amplifiers. The primary side of the
transformer is connected to the RF input pin. The second-
ary side of the transformer is connected to the differential
inputs of the transconductance amplifiers. Under no cir-
cumstances should an external DC voltage be applied to
the RF input pin. DC current flowing into the primary side
of the transformer may cause damage to the integrated
transformer. A series blocking capacitor should be used
to AC-couple the RF input port to the RF signal source.
The RF input port is internally matched over a wide fre-
quency range from 1.5GHz to 2.7GHz with input return loss
typically better than 10dB. No external matching network is
needed for this frequency range. When the part is operated
at lower frequencies, however, the input return loss can
be improved with the matching network shown in Figure
4. Shunt capacitor C10 and series capacitor C11 can be
selected for optimum input impedance matching at the
desired frequency as illustrated in Figure 5. For lower fre-
quency band operation, the external matching component
C11 can serve as a series DC blocking capacitor.
Figure 5. RF Input Return Loss with External Matching
Figure 4. RF Input Interface
5575 F04
2
3
EXTERNAL
MATCHING
NETWORK FOR
LOW BAND AND
MID BAND
RF
INPUT
RF
C10
C11
TO I-MIXER
TO Q-MIXER
–30
–25
–20
–15
–10
–5
0
0.5
1.0
1.5
2.0
2.5
3.0
FREQUENCY (GHz)
5575 F05
NO EXTERNAL
MATCHING
C11 = 3.9pF;
NO SHUNT CAP
C11 = 5.6pF;
C10 = 4.7pF


Similar Part No. - LT5575_15

ManufacturerPart #DatasheetDescription
logo
Linear Technology
LT5575EUF LINER-LT5575EUF Datasheet
307Kb / 16P
   800MHz to 2.7GHz High Linearity Direct Conversion Quadrature Demodulator
LT5575EUF-PBF LINER-LT5575EUF-PBF Datasheet
311Kb / 16P
   LT5575
LT5575EUF-TRPBF LINER-LT5575EUF-TRPBF Datasheet
311Kb / 16P
   LT5575
LT5575EUFPBF LINER-LT5575EUFPBF Datasheet
307Kb / 16P
   800MHz to 2.7GHz High Linearity Direct Conversion Quadrature Demodulator
LT5575EUFTRPBF LINER-LT5575EUFTRPBF Datasheet
307Kb / 16P
   800MHz to 2.7GHz High Linearity Direct Conversion Quadrature Demodulator
More results

Similar Description - LT5575_15

ManufacturerPart #DatasheetDescription
logo
Linear Technology
LT5575 LINER-LT5575 Datasheet
307Kb / 16P
   800MHz to 2.7GHz High Linearity Direct Conversion Quadrature Demodulator
LT5516 LINER-LT5516 Datasheet
194Kb / 12P
   800MHz to 1.5GHz Direct Conversion Quadrature Demodulator
LT5516 LINER-LT5516_15 Datasheet
205Kb / 12P
   800MHz to 1.5GHz Direct Conversion Quadrature Demodulator
LT5515 LINER-LT5515 Datasheet
197Kb / 12P
   1.5GHz to 2.5GHz Direct Conversion Quadrature Demodulator
LT5515 LINER-LT5515_15 Datasheet
203Kb / 12P
   1.5GHz to 2.5GHz Direct Conversion Quadrature Demodulator
logo
Analog Devices
AD8347 AD-AD8347_15 Datasheet
630Kb / 28P
   0.8 GHz to 2.7 GHz Direct Conversion Quadrature Demodulator
REV. A
AD8347 AD-AD8347 Datasheet
750Kb / 20P
   0.8 GHz-2.7 GHz Direct Conversion Quadrature Demodulator
REV. 0
logo
Linear Technology
LT5558 LINER-LT5558 Datasheet
319Kb / 16P
   600MHz to 1100MHz High Linearity Direct Quadrature Modulator
LT5572 LINER-LT5572 Datasheet
326Kb / 16P
   1.5GHz to 2.5GHz High Linearity Direct Quadrature Modulator
LTC5598 LINER-LTC5598 Datasheet
289Kb / 16P
   5MHz to 1600MHz High Linearity Direct Quadrature Modulator
More results


Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16


Datasheet Download

Go To PDF Page


Link URL




Privacy Policy
ALLDATASHEET.NET
Does ALLDATASHEET help your business so far?  [ DONATE ] 

About Alldatasheet   |   Advertisement   |   Contact us   |   Privacy Policy   |   Link Exchange   |   Manufacturer List
All Rights Reserved©Alldatasheet.com


Mirror Sites
English : Alldatasheet.com  |   English : Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp
Russian : Alldatasheetru.com  |   Korean : Alldatasheet.co.kr  |   Spanish : Alldatasheet.es  |   French : Alldatasheet.fr  |   Italian : Alldatasheetit.com
Portuguese : Alldatasheetpt.com  |   Polish : Alldatasheet.pl  |   Vietnamese : Alldatasheet.vn
Indian : Alldatasheet.in  |   Mexican : Alldatasheet.com.mx  |   British : Alldatasheet.co.uk  |   New Zealand : Alldatasheet.co.nz
Family Site : ic2ic.com  |   icmetro.com