LT5526 Datasheet PDF - Linear Technology

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LT5526
Linear Technology

Part Number LT5526
Description Low Power Downconverting Mixer
Page 16 Pages


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FEATURES
Operation up to 2GHz
Broadband RF, LO and IF Operation
High Input IP3: +16.5dBm at 900MHz
Typical Conversion Gain: 0.6dB at 900MHz
SSB Noise Figure: 11dB at 900MHz
On-Chip 50LO Match
Integrated LO Buffer: –5dBm Drive Level
High LO-RF and LO-IF Isolation
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
Cable Downlink Infrastructure
High Linearity Receiver Applications
LT5526
High Linearity, Low Power
Downconverting Mixer
DESCRIPTIO
The LT®5526 is a low power broadband mixer optimized
for high linearity applications such as point-to-point data
transmission, cable infrastructure and wireless infrastruc-
ture systems. The device includes an internally matched
high speed LO amplifier driving a double-balanced active
mixer core. An integrated RF buffer amplifier provides
excellent LO-RF isolation. The RF and IF ports can be easily
matched across a broad range of frequencies for use in a
wide variety of applications.
The LT5526 offers a high performance alternative to
passive mixers. Unlike passive mixers which have conver-
sion loss and require high LO drive levels, the LT5526
delivers conversion gain 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.
TYPICAL APPLICATIO
High Signal Level Frequency Downconversion
900MHz
LNA
900MHz
EN
BIAS
VCC2 VCC1
RF+ IF+
RF IF
VCC
5V DC
140MHz
VGA
ADC
LT5526
GND
LO+ LO
LO INPUT
–5dBm
5526 TA01
IF Output Power and IM3 vs
RF Input Power (Two Input Tones)
0
–10
–20
POUT
–30
–40
–50
–60
–70
–80 IM3
–90
–100
–20
TA = 25°C
fIF = 140MHz
fRF = 900MHz
fLO = 760MHz
PLO = –5dBm
–15 –10
–5
RF INPUT POWER (dBm/TONE)
0
5526 TA02
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LT5526
ABSOLUTE MAXIMUM RATINGS
(Note 1)
Supply Voltage ...................................................... 5.5V
Enable Voltage ............................... –0.3V to VCC + 0.3V
LO Input Power ............................................... +10dBm
LO+ to LODifferential DC Voltage ......................... ±1V
RF Input Power ................................................ +10dBm
RF+ to RFDifferential DC Voltage ....................... ±0.7V
Operating Temperature Range ................ – 40°C to 85°C
Storage Temperature Range ................. – 65°C to 125°C
Junction Temperature (TJ)................................... 125°C
PACKAGE/ORDER INFORMATION
TOP VIEW
16 15 14 13
NC 1
RF+ 2
RF3
12 GND
11 IF+
17 10 IF
NC 4
9 GND
5678
UF PACKAGE
16-LEAD (4mm × 4mm) PLASTIC QFN
TJMAX = 125°C, θJA = 37°C/W
EXPOSED PAD (PIN 17) IS GND,
MUST BE SOLDERED TO PCB.
NC PINS SHOULD BE GROUNDED
ORDER PART
NUMBER
LT5526EUF
UF PART
MARKING
5526
Consult LTC Marketing for parts specified with wider operating temperature ranges.
DC ELECTRICAL CHARACTERISTICS
VCC = 5V, EN = 3V, TA = 25°C (Note 3), unless otherwise noted. Test circuit shown in Figure 1.
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
Power Supply Requirements (VCC)
Supply Voltage
3.6 5 5.3
V
Supply Current
Shutdown Current
VCC = 5V
EN = Low
28 33 mA
100 µA
Enable (EN) Low = Off, High = On
EN Input High Voltage (On)
3V
EN Input Low Voltage (Off)
0.3 V
Enable Pin Input Current
EN = 5V
EN = 0V
55 µA
0.01 µA
Turn-On Time (Note 5)
3 µs
Turn-Off Time (Note 5)
6 µs
AC ELECTRICAL CHARACTERISTICS (Notes 2, 3)
PARAMETER
RF Input Frequency Range (Note 4)
LO Input Frequency Range (Note 4)
IF Output Frequency Range (Note 4)
CONDITIONS
Requires RF Matching
Requires DC Blocks
Requires IF Matching
VCC = 5V, EN = 3V, TA = 25°C. Test circuits shown in Figures 1 and 2. (Notes 2, 3)
PARAMETER
CONDITIONS
RF Input Return Loss
LO Input Return Loss
IF Output Return Loss
LO Input Power
ZO = 50, External Match
ZO = 50, External DC Blocks
ZO = 50, External Match
2
MIN TYP MAX UNITS
0.1 to 2000
MHz
0.1 to 2500
MHz
0.1 to 1000
MHz
MIN TYP MAX UNITS
15 dB
15 dB
15 dB
–10 to 0
dBm
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LT5526
AC ELECTRICAL CHARACTERISTICS VCC = 5V, EN = 3V, TA = 25°C, PRF = –15dBm (–15dBm/tone for 2-tone
IIP3 tests, f = 1MHz), PLO = –5dBm, unless otherwise noted. Test circuits shown in Figures 1 and 2. (Notes 2, 3)
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
RF to LO Isolation
fRF = 350MHz, fIF = 70MHz, fLO = 420MHz
fRF = 900MHz, fIF = 140MHz, fLO = 760MHz
fRF = 1900MHz, fIF = 140MHz, fLO = 1760MHz
69 dB
55 dB
50 dB
Conversion Gain
fRF = 350MHz, fIF = 70MHz, fLO = 420MHz
fRF = 900MHz, fIF = 140MHz, fLO = 760MHz
fRF = 1900MHz, fIF = 140MHz, fLO = 1760MHz
0.6 dB
0.6 dB
0.4 dB
Conversion Gain vs Temperature
Input 3rd Order Intercept
Single Sideband Noise Figure
TA = –40°C to 85°C
fRF = 350MHz, fIF = 70MHz, fLO = 420MHz
fRF = 900MHz, fIF = 140MHz, fLO = 760MHz
fRF = 1900MHz, fIF = 140MHz, fLO = 1760MHz
fRF = 350MHz, fIF = 70MHz, fLO = 420MHz
fRF = 900MHz, fIF = 140MHz, fLO = 760MHz
fRF = 1900MHz, fIF = 140MHz, fLO = 1760MHz
–0.013
15.2
16.5
14.1
12.7
11.0
13.7
dB/°C
dBm
dBm
dBm
dB
dB
dB
LO to RF Leakage
fRF = 350MHz, fIF = 70MHz, fLO = 420MHz
fRF = 900MHz, fIF = 140MHz, fLO = 760MHz
fRF = 1900MHz, fIF = 140MHz, fLO = 1760MHz
–65 dBm
–65 dBm
–55 dBm
LO to IF Leakage
fRF = 350MHz, fIF = 70MHz, fLO = 420MHz
fRF = 900MHz, fIF = 140MHz, fLO = 760MHz
fRF = 1900MHz, fIF = 140MHz, fLO = 1760MHz
–56 dBm
–74 dBm
–37 dBm
2RF-2LO Output Spurious Product
(fRF = fLO ± fIF/2)
3RF-3LO Output Spurious Product
(fRF = fLO ± fIF/3)
Input 1dB Compression
350MHz: fRF = 385MHz at –15dBm, fLO = 420MHz
900MHZ: fRF = 830MHz at –15dBm, fLO = 760MHz
1900MHz: fRF = 1830MHz at –15dBm, fLO = 1760MHz
350MHz: fRF = 396.67MHz at –15dBm, fLO = 420MHz
900MHZ: fRF = 806.67MHz at –15dBm, fLO = 760MHz
1900MHz: fRF = 1806.67MHz at –15dBm, fLO = 1760MHz
fRF = 350MHz, fIF = 70MHz, fLO = 420MHz
fRF = 900MHz, fIF = 140MHz, fLO = 760MHz
fRF = 1900MHz, fIF = 140MHz, fLO = 1760MHz
–75
–72
–48
–65
–68
–56
5
5
1
dBc
dBc
dBc
dBc
dBc
dBc
dBm
dBm
dBm
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: The 900MHz and 1900MHz performance is measured with the test
circuit shown in Figure 1. The 350MHz performance is measured using the
test circuit in Figure 2.
Note 3: Specifications over the –40°C to 85°C temperature range are
assured by design, characterization and correlation with statistical process
controls.
Note 4: Operation over a wider frequency range is possible with reduced
performance. Consult the factory for information and assistance.
Note 5: Turn-on and turn-off times correspond to a change in the output
level by 40dB.
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LT5526
TYPICAL AC PERFOR A CE CHARACTERISTICS 900MHz Application. VCC = 5V, EN = 3V,
TA = 25°C, PRF = –15dB (–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.
Conversion Gain, IIP3 and SSB NF
vs RF Frequency (Low Side LO)
20
18
IIP3
16
TA = 25°C
fIF = 140MHz
14
12 SSB NF
10
8
6
4
2
GAIN
0
–2
600
800
1000
1200
RF FREQUENCY (MHz)
1400
5526 G01
Conversion Gain, IIP3 and SSB NF
vs RF Frequency (High Side LO)
20
18
IIP3
16
TA = 25°C
fIF = 140MHz
14
12 SSB NF
10
8
6
4
2
GAIN
0
–2
600
800
1000
1200
RF FREQUENCY (MHz)
1400
5526 G02
Conversion Gain, IIP3 and SSB NF
vs Temperature
25
fIF = 140MHz
20
IIP3
15
SSB NF
LOW SIDE LO
HIGH SIDE LO
HIGH SIDE LO
10 LOW SIDE LO
5
GAIN
0
LOW AND HIGH SIDE LO
–5
–50 –30
–10 10 30 50
TEMPERATURE (°C)
70 90
5526 G03
Conversion Gain and IIP3
vs LO Input Power
25
fLO = 760MHz
fIF = 140MHz
20
15
IIP3
10
5
GAIN
0
25°C
85°C
–40°C
–5
–12 –10
–8 –6 –4 –2
LO INPUT POWER (dBm)
02
5526 G04
SSB Noise Figure
vs LO Input Power
16
fLO = 760MHz
15 fIF = 140MHz
14
25°C
85°C
–40°C
13
12
11
10
9
8
–12 –10
–8 –6 –4 –2
LO INPUT POWER (dBm)
02
5526 G05
LO-IF and LO-RF Leakage
vs LO Input Frequency
0
TA = 25°C
–10 fIF = 140MHz
–20
–30
–40
LO-IF
–50
–60
LO-RF
–70
–80
–90
–100
500
700 900 1100 1300 1500
LO FREQUENCY (MHz)
5526 G06
Conversion Gain and IIP3
vs Supply Voltage
25
fLO = 760MHz
fIF = 140MHz
20
15
10
IIP3
5
GAIN
0
25°C
85°C
–40°C
–5
2.8 3.2
3.6 4.0 4.4 4.8
SUPPLY VOLTAGE (V)
5.2 5.6
5526 G07
RF, LO and IF Port Return Loss
vs Frequency
0
RF PORT
–5
–10
IF PORT
–15
–20
LO PORT
–25
–30
0
500 1000 1500
FREQUENCY (MHz)
2000
5526 G08
IF Output Power and IM3 vs RF
Input Power (Two Input Tones)
0
–10
–20
POUT
–30
–40
–50
–60
–70
IM3
–80
–90
–100
–20
–15
fLO = 760MHz
fIF = 140MHz
25°C
85°C
–40°C
–10 –5
0
RF INPUT POWER (dBm/TONE)
5526 G09
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