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PDF LT5512 Data sheet ( Hoja de datos )
| Número de pieza | LT5512 | |
| Descripción | 1kHz-3GHz High Signal Level Down-Converting Mixer | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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LT5512www.DataSheet4U.com
1kHz-3GHz High Signal Level
Down-Converting Mixer
FEATURES
s Broadband RF, LO and IF Operation
s High Input IP3: +21dBm at 900MHz
+17dBm at 1900MHz
s Typical Conversion Gain: 1dB at 1900MHz
s SSB Noise Figure: 11dB at 900MHz
14dB at 1900MHz
s Integrated LO Buffer: Insensitive to LO Drive Level
s Single-Ended or Differential LO Signal
s High LO-RF Isolation
s Enable Function
s 4.5V to 5.25V Supply Voltage Range
s 4mm × 4mm QFN Package
U
APPLICATIO S
s Cellular/PCS/UMTS Infrastructure
s CATV Downlink Infrastructure
s High Linearity Mixer Applications
s ISM Band Receivers
DESCRIPTIO
The LT®5512 is a broadband mixer IC optimized for high
linearity downconverter applications including cable and
wireless infrastructure. The IC includes a differential LO
buffer amplifier driving a double-balanced mixer. An inte-
grated RF buffer amplifier improves LO-RF isolation and
eliminates the need for precision external bias resistors.
The LT5512 is a high-linearity alternative to passive diode
mixers. Unlike passive mixers, which have conversion
loss and require high LO drive levels, the LT5512 delivers
conversion gain and requires significantly lower LO drive
levels.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATIO
High Signal-Level Downmixer for Wireless Infastructure
1850MHz
TO
1910MHz
1850MHz
TO
1910MHz
LNA
1:2
1.5pF
100pF
5V
1µF
EN VCC1 VCC2
RF+ LT5512
IF+
IF –
RF –
70MHz
220nH (TYP)
100pF
IF
VGA
8.2pF
220nH
LTC1748
ADC
LO+ LO–
LO
INPUT
–10dBm
5.6nH
100pF
100pF
5512 F01a
Output IF Power and Output IM3 vs
RF Input Power (Two Input Tones)
10
0
–10 IFOUT
–20
–30
IM3
–40
–50
–60
–70
–80
–21 –18 –15 –12 –9
TA = 25°C
PLO = –10dBm
fLO = 1830MHz
fRF1 = 1899.9MHz
fRF2 = 1900.1MHz
–6 –3 0 3 6
RF INPUT POWER (dBm/TONE)
5512 F01b
5512f
1
1 page  
LT5512www.DataSheet4U.com
TYPICAL PERFOR A CE CHARACTERISTICS (1900MHz Downmixer Application, continued)
VCC = 5VDC, EN = High, TA = 25°C, 1900MHz RF input matching, RF input = 1900MHz at –10dBm, LO input = 1730MHz at –10dBm, IF
output measured at 170MHz, unless otherwise noted. (Test circuit shown in Figure 2).
IF Output Power, 2RF-2LO and
3RF-3LO vs RF Input Power
10 TA = 25°C
fLO = 1730MHz
–10 PLO = –10dBm
POUT
(RF = 1900MHz)
–30
3RF-3LO
(RF = 1786.67MHz)
–50
2RF-2LO
–70 (RF = 1815MHz)
–90
2RF-2LO (Half-IF) Spur Level vs
LO Input Power
–50
TA = 25°C
–55
fLO = 1730MHz
fRF = 1815MHz
–60
–65
–70 PRF = –10dBm
–75
–80 PRF = –16dBm
–85
3RF-3LO Spur Level vs
LO Input Power
–50
TA = 25°C
–55
fLO = 1730MHz
fRF = 1786.67MHz
–60
–65 PRF = –10dBm
–70
–75
–80
PRF = –16dBm
–85
–110
–22 –19 –16 –13 –10 –7 –4
RF INPUT POWER (dBm)
–1 2
5512 G18
–90
–18 –16 –14 –12 –10 –8 –6
LO INPUT POWER (dBm)
–4 –2
5512 G19
–90
–18 –16 –14 –12 –10 –8 –6
LO INPUT POWER (dBm)
–4 –2
5512 G20
(1230MHz Cable Infrastructure Downmixer Application) VCC = 5VDC, EN = High, TA = 25°C, RF input = 1230MHz at –10dBm, LO input
swept from = 1500MHz to 2100MHz, PLO = –10dBm, IF output measured from 270MHz to 870MHz, unless otherwise noted. (Test circuit
shown in Figure 3.)
Conv Gain, IIP3 and SSB NF
vs IF Output Frequency
20
IIP3
18
TA = 85°C
TA = 25°C
16 TA = –40°C
14
12 SSB NF
10 TA = 25°C
8
6 CONV GAIN
4 TA = –40°C
TA = 25°C
2
0
270
TA = 85°C
370 470 570 670 770 870
IF OUTPUT FREQUENCY (MHz) 5512 G12
LO Leakage vs LO Frequency
–10
–20
–30
LO-IF
–40
–50
LO-RF
–60
–70
1500 1600 1700 1800 1900 2000 2100
LO FREQUENCY (MHz)
5512 G13
IF Output Power and 2RF-LO Spur
vs RF Input Power
10
0
POUT
–10
TA = –40°C
TA = 85°C
–20 TA = 25°C
–30
–40
–50
2RF-LO
–60
TA = –40°C
TA = 85°C
–70
–80
–90
–21 –18
TA = 25°C
fLO = 1800MHz
fIF = 570MHz
–15 –12 –9 –6 –3 0
RF INPUT POWER (dBm)
5512 G14
Conv Gain, IIP3 and SSB NF
vs LO Input Power
20
TA = 85°C
18
IIP3
TA = 25°C
16 TA = –40°C
14
12 SSB NF
10 TA = 25°C
8
CONV GAIN
6
4 TA = –40°C
fLO = 1800MHz
fIF = 570MHz
TA = 25°C
TA = 85°C
2
–20
–15 –10
–5
LO INPUT POWER (dBm)
0
5512 G15
Conv Gain and IIP3 vs
Temperature
20
18
IIP3
16
5.5VDC
4.5VDC
14 5VDC
12
10 fLO = 1800MHz
fIF = 570MHz
8
6
CONV GAIN
4
4.5, 5.0 AND 5.5VDC
2
–50 –35 –20 –5 10 25 40 55 70 85
TEMPERATURE (°C)
5512 G16
RF, LO and IF Port Return Losses
vs Frequency
0
–5
IF
–10
RF LO
–15
–20
–25
–30
0
500 1000 1500 2000
FREQUENCY (MHz)
2500
5512 G17
5512f
5
5 Page 
PACKAGE DESCRIPTIO
UF16 Package
16-Lead Plastic QFN (4mm × 4mm)
(Reference LTC DWG # 05-08-1692)
LT5512www.DataSheet4U.com
0.72 ±0.05
4.35 ± 0.05
2.15 ± 0.05
2.90 ± 0.05 (4 SIDES)
PACKAGE OUTLINE
0.30 ±0.05
0.65 BCS
RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS
4.00 ± 0.10
(4 SIDES)
0.75 ± 0.05
PIN 1
2.15 ± 0.10
(4-SIDES)
BOTTOM VIEW—EXPOSED PAD
R = 0.115
TYP
15 16
0.55 ± 0.20
1
2
0.200 REF
0.00 – 0.05
NOTE:
1. DRAWING CONFORMS TO JEDEC PACKAGE OUTLINE MO-220 VARIATION (WGGC)
2. ALL DIMENSIONS ARE IN MILLIMETERS
3. DIMENSIONS OF EXPOSED PAD ON BOTTOM OF PACKAGE DO NOT INCLUDE
MOLD FLASH. MOLD FLASH, IF PRESENT, SHALL NOT EXCEED 0.15mm ON ANY SIDE
4. EXPOSED PAD SHALL BE SOLDER PLATED
(UF) QFN 0102
0.30 ± 0.05
0.65 BSC
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.
5512f
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11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet LT5512.PDF ] | |
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