LT5516 LINER [Linear Technology], LT5516 Datasheet

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LT5516

Manufacturer Part Number
LT5516
Description
800MHz to 1.5GHz Direct Conversion Quadrature Demodulator
Manufacturer
LINER [Linear Technology]
Datasheet

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APPLICATIO S
FEATURES
TYPICAL APPLICATIO
Frequency Range: 800MHz to 1.5GHz
High IIP3: 21.5dBm at 900MHz
High IIP2: 52dBm
Noise Figure: 12.8dB at 900MHz
Conversion Gain: 4.3dB at 900MHz
I/Q Gain Mismatch: 0.2dB
Shutdown Mode
16-Lead QFN 4mm 4mm Package
with Exposed Pad
Cellular/PCS/UMTS Infrastructure
High Linearity Direct Conversion I/Q Receiver
High Linearity I/Q Demodulator
BPF
LNA
Figure 1. High Signal-Level I/Q Demodulator for Wireless Infrastructure
LO INPUT
ENABLE
BPF
U
RF
RF
LO
LO
EN
+
+
U
Conversion Quadrature Demodulator
0 /90
V
5V
CC
0
90
LT5516
I
I
Q
Q
OUT
OUT
OUT
OUT
+
+
DESCRIPTIO
The LT
quadrature demodulator optimized for high linearity re-
ceiver applications. It is suitable for communications
receivers where an RF or IF signal is directly converted into
I and Q baseband signals with bandwidth up to 260MHz.
The LT5516 incorporates balanced I and Q mixers, LO
buffer amplifiers and a precision, high frequency quadra-
ture generator.
In an RF receiver, the high linearity of the LT5516 provides
excellent spur-free dynamic range, even with fixed gain
front end amplification. This direct conversion receiver
can eliminate the need for intermediate frequency (IF)
signal processing, as well as the corresponding require-
ments for image filtering and IF filtering. Channel filtering
can be performed directly at the outputs of the I and Q
channels. These outputs can interface directly to channel-
select filters (LPFs) or to a baseband amplifier.
, LTC and LT are registered trademarks of Linear Technology Corporation.
LPF
LPF
800MHz to 1.5GHz Direct
®
VGA
VGA
5516 is an 800MHz to 1.5GHz direct conversion
DSP
5516 F01
U
–100
–20
–40
–60
–80
20
0
–18
I/Q Output Power, IM3 vs
RF Input Power
–14
RF INPUT POWER (dBm)
–10
P
OUT
IM3
–6
LT5516
V
T
P
f
f
f
LO
RF1
RF2
A
CC
LO
–2
= 25 C
= 901MHz
= 5v
= –10dBm
= 899.9MHz
= 900.1MHz
2
5516 TA01
1
5516f
6

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LT5516 Summary of contents

Page 1

... The LT5516 incorporates balanced I and Q mixers, LO buffer amplifiers and a precision, high frequency quadra- ture generator receiver, the high linearity of the LT5516 provides excellent spur-free dynamic range, even with fixed gain front end amplification. This direct conversion receiver can eliminate the need for intermediate frequency (IF) signal processing, as well as the corresponding require- ments for image filtering and IF filtering ...

Page 2

... Voltage Gain, Load Impedance = 1k – 8 3 2-Tone, –10dBm/Tone 8 200kHz Input = –10dBm 8.2 (Note 4) (Note 4) Differential U W TOP VIEW ORDER PART NUMBER LT5516EUF – PART MARKING UF PACKAGE 5516 ...

Page 3

... Note 4: Measured –10dBm and output frequency = 1MHz unless otherwise noted CONDITIONS EN = Low ENABLE f = 901MHz –10dBm LO LO – LT5516 MIN TYP MAX UNITS 4 5. 117 150 120 ns 650 ns 1.6 V 1.3 ...

Page 4

... LT5516 W U TYPICAL PERFOR A CE CHARACTERISTICS (Test circuit optimized for 900MHz operation as shown in Figure 2) Supply Current vs Supply Voltage 160 140 120 T = – 100 4.5 SUPPLY VOLTAGE (V) IIP2 vs RF Input Frequency –10dBm ...

Page 5

... IIP3 901MHz –10dBm 8 CONV GAIN T = – 4.5 5 SUPPLY VOLTAGE (V) LT5516 Input Power 1300MHz 1100MHz 900MHz 8.2 4 –14 –12 –10 –8 – ...

Page 6

... LT5516 W U TYPICAL PERFOR A CE CHARACTERISTICS (Test circuit optimized for 900MHz operation as shown in Figure 2) LO-RF Leakage vs LO Input Power – 8.2 – 900MHz RF – 1300MHz RF – 1100MHz RF –75 –80 –14 –12 –10 –8 –6 LO INPUT POWER (dBm) RF, LO Port Return Loss vs ...

Page 7

... I-MIXER RF AMP LO BUFFERS 0 /90 Q-MIXER – EN GND GND LO LO LT5516 (Pins 10, 11): Differential Local Oscillator Input + (Pins 13, 14): Differential Baseband Output OUT + (Pins 15, 16): Differential Baseband Output + LPF 16 I OUT – OUT + LPF 14 Q OUT – ...

Page 8

... Figure 3. Component Side Silkscreen of Evaluation Board – OUT OUT – OUT OUT GND – LT5516 – 33nH + RF LO GND 1nF 8.2 100k REFERENCE DESIGNATION VALUE SIZE PART NUMBER C1,C2,C5,C6,C7 1nF 0402 AVX 04025C102JAT C3 0 ...

Page 9

... U U APPLICATIO S I FOR ATIO The LT5516 is a direct I/Q demodulator targeting high linearity receiver applications, including wireless infra- structure. It consists amplifier, I/Q mixers, a quadrature LO carrier generator and bias circuitry. The RF signal is applied to the inputs of the RF amplifier and is then demodulated into I/Q baseband signals using quadrature LO signals ...

Page 10

... Each output can sink no more than 13mA when the outputs are connected to an external load with a DC voltage higher than V The I/Q output equivalent circuit is shown in Figure 7. LT5516 LDB31900M20C-416 ...

Page 11

... LTC DWG # 05-08-1692) 0.72 0.05 PACKAGE OUTLINE 0.30 0.05 0.65 BSC 0.75 0.05 4.00 0.10 (4 SIDES) PIN 1 TOP MARK 2.15 0.10 (4-SIDES) 0.200 REF 0.00 – 0.05 MOLD FLASH. MOLD FLASH, IF PRESENT, SHALL NOT EXCEED 0.15mm ON ANY SIDE LT5516 5pF 5pF Figure 7. I/Q Output Equivalent Circuit BOTTOM VIEW—EXPOSED PAD R = 0.115 0.55 0.20 TYP ...

Page 12

... LT5516 RELATED PARTS PART NUMBER DESCRIPTION RF Power Controllers LTC1757A RF Power Controller LTC1758 RF Power Controller LTC1957 RF Power Controller LTC4400 SOT- Controller LTC4401 SOT- Controller LTC4403 RF Power Controller for EDGE/TDMA LT5500 RF Front End LT5502 400MHz Quadrature Demodulator with RSSI LT5503 1.2GHz to 2.7GHz Direct IQ Modulator and ...

Page 13

... This datasheet has been download from: www.datasheetcatalog.com Datasheets for electronics components. ...

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