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PDF LT5525 Data sheet ( Hoja de datos )
| Número de pieza | LT5525 | |
| Descripción | High Linearity Low Power Downconverting Mixer | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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FEATURES
■ Wide Input Frequency Range: 0.8GHz to 2.5GHz*
■ Broadband LO and IF Operation
■ High Input IP3: +17.6dBm at 1900MHz
■ Typical Conversion Gain: –1.9dB at 1900MHz
■ High LO-RF and LO-IF Isolation
■ SSB Noise Figure: 15.1dB at 1900MHz
■ Single-Ended 50Ω RF and LO Interface
■ Integrated LO Buffer: –5dBm Drive Level
■ Low Supply Current: 28mA Typ
■ Enable Function
■ Single 5V Supply
■ 16-Lead QFN (4mm × 4mm) Package
U
APPLICATIO S
■ Point-to-Point Data Communication Systems
■ Wireless Infrastructure
■ High Performance Radios
■ High Linearity Receiver Applications
LT5525www.DataSheet4U.com
High Linearity, Low Power
Downconverting Mixer
DESCRIPTIO
The LT®5525 is a low power broadband mixer optimized
for high linearity applications such as point-to-point data
transmission, high performance radios and wireless infra-
structure systems. The device includes an internally 50Ω
matched high speed LO amplifier driving a double-bal-
anced active mixer core. An integrated RF buffer amplifier
provides excellent LO-RF isolation. The RF input balun and
all associated 50Ω matching components are integrated.
The IF ports can be easily matched across a broad range
of frequencies for use in a wide variety of applications.
The LT5525 offers a high performance alternative to
passive mixers. Unlike passive mixers, which require high
LO drive levels, the LT5525 operates at significantly lower
LO input levels and is much less sensitive to LO power
level variations.
, LTC and LT are registered trademarks of Linear Technology Corporation.
*Operation over a wider frequency range is achievable with reduced performance.
Consult factory for more information.
TYPICAL APPLICATIO
High Signal Level Frequency Downconversion
EN
BIAS
1900MHz
LNA
1900MHz
RF+
RF –
VCC2 VCC1
IF+
IF –
0.01µF
100pF
VCC
5V DC
150nH
1.2pF
150nH
140MHz
4:1
VGA
LT5525
GND
LO+ LO–
LO INPUT
–5dBm
5525 TA01
ADC
IF Output Power and IM3 vs
RF Input Power (Two Input Tones)
0
–10
–20
–30 POUT
–40
–50
–60
–70
–80
–90 IM3
–100
–20
TA = 25°C
fRF = 1900MHz
fLO = 1760MHz
fIF = 140MHz
PLO = –5dBm
–15 –10
–5
RF INPUT POWER (dBm/TONE)
0
5525 TA02
5525f
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1 page  
LT5525www.DataSheet4U.com
TYPICAL AC PERFOR A CE CHARACTERISTICS VCC = 5V, EN = 3V, TA = 25°C, fRF = 1900MHz,
PRF = –15dBm (–15dBm/tone for 2-tone IIP3 tests, ∆f = 1MHz), fLO = fRF – 140MHz, PLO = –5dBm, IF output measured at 140MHz,
unless otherwise noted. Test circuit shown in Figure 1.
IFOUT, 2 × 2 and 3 × 3 Spurs
vs RF Input Power
10
0 IF OUT
–10 fRF = 1900MHz
–20
–30 3RF-3LO
–40 fRF = 1806.67MHz
–50
–60 2RF-2LO
–70 fRF = 1830MHz
–80
–90
–100
–20
TA = 25°C
fLO = 1760MHz
fIF = 140MHz
–15 –10
–5
RF INPUT POWER (dBm)
0
5525 G10
2 × 2 and 3 × 3 Spurs
vs LO Input Power
–30
TA = 25°C
–40
fLO = 1760MHz
fIF = 140MHz
–50
–60
2RF-2LO
–70 fRF = 1830MHz
–80
3RF-3LO
–90 fRF = 1806.67MHz
–100
–16
–12 –8
–4
0
LO INPUT POWER (dBm)
4
5525 G11
TYPICAL DC PERFOR A CE CHARACTERISTICS Test circuit shown in Figure 1.
Supply Current vs Supply Voltage
32
30
28
26
24
22
20
18
25°C
16 85°C
–40°C
14
2.8 3.2 3.6 4 4.4 4.8 5.2 5.6
SUPPLY VOLTAGE (V)
5525 G12
Shutdown Current vs Supply Voltage
20
25°C
85°C
–40°C
15
10
5
0
2.8 3.2
3.6 4 4.4 4.8
SUPPLY VOLTAGE (V)
5.2 5.6
5525 G13
5525f
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LT5525www.DataSheet4U.com
APPLICATIO S I FOR ATIO
Conversion gain and IIP3 performance with an RF fre-
quency of 1900MHz are plotted vs IF frequency in Figure
13. These results show that the usable IF bandwidth for the
lumped element balun is greater than 60MHz, assuming
tight tolerance matching components. Contact the factory
for applications assistance with this circuit.
Table 4. Component Values for Lumped Balun
IF FREQ (MHz) L11, L12 (nH) C11, C12 (pF) C13 (pF)
240 100 3.9 100
360 68 2.7 10
450 56 2.2 8.2
L14 (nH)
560
270
180
0
–5
–10
–15
–20
–25
200 250 300 350 400
FREQUENCY (MHz)
450 500
5525 F12
Figure 12. Typical IF Return Loss
Performance with 240MHz,
360MHz and 450MHz Lumped
Element Baluns
20
IIP3
15
10
5
GAIN
0
TA = 25°C
fLO = fRF – fIF
fRF = 1900MHz
PLO = –5dBm
PRF = –15dBm
–5
200
250 300 350 400 450
IF FREQUENCY (MHz)
500
5525 F13
Figure 13. Typical Gain and IIP3 vs
IF Frequency with 240MHz,
360MHz and 450MHz Lumped
Element Baluns
20
19
18
17
16
15
14
13
12
TA = 25°C
fLO = fRF – fIF
11 PLO = –5dBm
PRF = –15dBm
10
1200 1400 1600 1800 2000
240MHz
360MHz
450MHz
2200 2400 2600
RF FREQUENCY (MHz)
5525 F14
Figure 14. Typical IIP3 vs RF
Frequency with Lumped Element
Baluns and IF Frequencies of
240MHz, 360MHz and 450MHz
TYPICAL APPLICATIO S
Top Layer Silkscreen
Evaluation Board Layouts
Top Layer Metal
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.
5525f
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11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet LT5525.PDF ] | |
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