LT5520 Datasheet PDF - Linear Technology

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LT5520
Linear Technology

Part Number LT5520
Description 1.3GHz to 2.3GHz High Linearity Upconverting Mixer
Page 12 Pages


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LT5520www.DataSheet4U.com
1.3GHz to 2.3GHz
High Linearity
Upconverting Mixer
FEATURES
s Wide RF Output Frequency Range: 1.3GHz
to 2.3GHz
s 15.9dBm Typical Input IP3 at 1.9GHz
s On-Chip RF Output Transformer
s No External LO or RF Matching Required
s Single-Ended LO and RF Operation
s Integrated LO Buffer: –5dBm Drive Level
s Low LO to RF Leakage: – 41dBm Typical
s Wide IF Frequency Range: DC to 400MHz
s Enable Function with Low Off-State Leakage Current
s Single 5V Supply
s Small 16-Lead QFUN Plastic Package
APPLICATIO S
s Wireless Infrastructure
s Cable Downlink Infrastructure
s Point-to-Point Data Communications
s High Linearity Frequency Conversion
DESCRIPTIO
The LT®5520 mixer is designed to meet the high linearity
requirements of wireless and cable infrastructure trans-
mission applications. A high-speed, internally matched,
LO amplifier drives a double-balanced mixer core, allow-
ing the use of a low power, single-ended LO source. An RF
output transformer is integrated, thus eliminating the
need for external matching components at the RF output,
while reducing system cost, component count, board area
and system-level variations. The IF port can be easily
matched to a broad range of frequencies for use in many
different applications.
The LT5520 mixer delivers 15.9dBm typical input 3rd
order intercept point at 1.9GHz with IF input signal levels
of –10dBm. The input 1dB compression point is typically
4dBm. The IC requires only a single 5V supply.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATIO
5VDC
IF
INPUT
1µF 1000pF
39nH
EN VCC1 VCC2 VCC3
BPF 220pF 100
4:1
BIAS
15pF
IF+
10pF
RF+
220pF
IF
100
RF
BPF
PA
RF
OUTPUT
(OPTIONAL)
LO INPUT
–5dBm
5pF
LO+
85
GND
5pF
LO
LT5520
5520 F01
RF Output Power and Output IM3 vs
IF Input Power (Two Input Tones)
10
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–16
POUT
PLO = –5dBm
IM3
fLO = 1760MHz
fIF1 = 140MHz
fIF2 = 141MHz
fRF = 1900MHz
TA = 25°C
–12 –8 –4 0
4
IF INPUT POWER (dBm/TONE)
5520 • F01b
Figure 1. Frequency Conversion in Wireless Infrastructure Transmitter
5520f
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LT5520
ABSOLUTE AXI U RATI GS
(Note 1)
Supply Voltage ....................................................... 5.5V
Enable Voltage ............................. –0.3V to (VCC + 0.3V)
LO Input Power (Differential) .............................. 10dBm
RF+ to RFDifferential DC Voltage...................... ±0.13V
RF Output DC Common Mode Voltage ......... –1V to VCC
IF Input Power (Differential) ............................... 10dBm
IF+, IFDC Currents .............................................. 25mA
LO+ to LODifferential DC Voltage .......................... ±1V
LO Input DC Common Mode Voltage ............ –1V to VCC
Operating Temperature Range .................–40°C to 85°C
Storage Temperature Range ................. – 65°C to 125°C
Junction Temperature (TJ).................................... 125°C
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UW U
PACKAGE/ORDER I FOR ATIO
TOP VIEW
16 15 14 13
GND 1
12 GND
IF+ 2
11 RF+
17
IF 3
10 RF
GND 4
9 GND
5678
UF PACKAGE
16-LEAD (4mm × 4mm) PLASTIC QFN
EXPOSED PAD IS GND (PIN 17),
MUST BE SOLDERED TO PCB
TJMAX = 125°C, θJA = 37°C/W
ORDER PART
NUMBER
LT5520EUF
UF PART
MARKING
5520
Consult LTC Marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS
PARAMETER
IF Input Frequency Range
LO Input Frequency Range
RF Output Frequency Range
CONDITIONS
MIN TYP MAX
DC to 400
900 to 2700
1300 to 2300
UNITS
MHz
MHz
MHz
1900MHz Application: VCC = 5VDC, EN = High, TA = 25°C, IF input = 140MHz at –10dBm, LO input = 1.76GHz at –5dBm, RF output
measured at 1900MHz, unless otherwise noted. Test circuit shown in Figure 2. (Notes 2, 3)
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
IF Input Return Loss
LO Input Return Loss
RF Output Return Loss
LO Input Power
ZO = 50, with External Matching
ZO = 50
ZO = 50
20
16
20
–10 to 0
dB
dB
dB
dBm
Conversion Gain
–1 dB
Input 3rd Order Intercept
–10dBm/Tone, f = 1MHz
15.9 dBm
Input 2nd Order Intercept
–10dBm, Single-Tone
45 dBm
LO to RF Leakage
–41 dBm
LO to IF Leakage
–35 dBm
Input 1dB Compression
4 dBm
IF Common Mode Voltage
Noise Figure
Internally Biased
Single Side Band
1.77 VDC
15 dB
DC ELECTRICAL CHARACTERISTICS
(Test Circuit Shown in Figure 2) VCC = 5VDC, EN = High , TA = 25°C (Note 3), unless otherwise noted.
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
Enable (EN) Low = Off, High = On
Turn-On Time (Note 4)
2 µs
Turn-Off Time (Note 4)
6 µs
Input Current
VENABLE = 5VDC
1 10
µA
5520f
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LT5520www.DataSheet4U.com
DC ELECTRICAL CHARACTERISTICS
(Test Circuit Shown in Figure 2) VCC = 5VDC, EN = High , TA = 25°C (Note 3), unless otherwise noted.
PARAMETER
Enable = High (On)
Enable = Low (Off)
Power Supply Requirements (VCC)
Supply Voltage
Supply Current
Shutdown Current
CONDITIONS
VCC = 5VDC
EN = Low
MIN TYP MAX UNITS
3 VDC
0.5 VDC
4.5 to 5.25
60
1
70
100
VDC
mA
µA
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: External components on the final test circuit are optimized for
operation at fRF = 1900MHz, fLO = 1.76GHz and fIF = 140MHz.
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: Turn-On and Turn-Off times are based on the rise and fall times of
the RF output envelope from full power to –40dBm with an IF input power
of –10dBm.
TYPICAL PERFOR A CE CHARACTERISTICS (Test Circuit Shown in Figure 2)
Supply Current
vs Supply Voltage
66
64
TA = 85°C
62
60 TA = 25°C
58
TA = –40°C
56
54
52
50
4.0
4.25 4.5 4.75 5.0 5.25 5.5
SUPPLY VOLTAGE (V)
5520 • GO1
Shutdown Current
vs Supply Voltage
1.0
0.9
0.8
0.7
0.6
TA = 85°C
0.5
0.4
0.3
0.2 TA = 25°C
0.1 TA = –40°C
0
4.0 4.25 4.5 4.75 5.0 5.25 5.5
SUPPLY VOLTAGE (V)
5520 • GO2
VCC = 5VDC, EN = High, TA = 25°C, IF input = 140MHz at –10dBm, LO input = 1.76GHz at –5dBm, RF output measured at 1900MHz,
unless otherwise noted. For 2-tone inputs: 2nd IF input = 141MHz at –10dBm. (Test Circuit Shown in Figure 2.)
Conversion Gain and SSB Noise
Figure vs RF Output Frequency
18
16 HIGH SIDE LO
14 LOW SIDE LO
12
SSB NF
10
8
6
4
2
GAIN
0 LOW SIDE AND HIGH SIDE LO
–2
–4
1300
1500 1700 1900 2100 2300 2500
RF OUTPUT FREQUENCY (MHz)
5520 • GO3
IIP3 and IIP2
vs RF Output Frequency
32
55
30 50
28
LOW SIDE LO
IIP2 45
26 40
24
HIGH SIDE LO
35
22 30
20
IIP3
18 LOW SIDE LO
25
20
16
HIGH SIDE LO
14
15
10
12
1300
5
1500 1700 1900 2100 2300 2500
RF OUTPUT FREQUENCY (MHz)
5520 • GO4
LO-RF Leakage
vs RF Output Frequency
–10
–20
–30
HIGH SIDE LO
–40
–50 LOW SIDE LO
–60
1300
1500 1700 1900 2100 2300 2500
RF OUTPUT FREQUENCY (MHz)
5520 • GO5
5520f
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LT5520
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TYPICAL PERFOR A CE CHARACTERISTICS
VCC = 5VDC, EN = High , TA = 25°C, IF input = 140MHz at –10dBm, LO input = 1.76GHz at –5dBm, RF output measured at 1900MHz,
unless otherwise noted. For 2-tone inputs: 2nd IF Input = 141MHz at –10dBm. (Test Circuit Shown in Figure 2.)
Conversion Gain and SSB Noise
Figure vs LO Input Power
16 20
14 TA = 85°C
12
18
SSB NF
16
10 14
8
TA = 25°C
TA = –40°C 12
6 10
4
2 GAIN
0
TA = –40°C
TA = 25°C
–2
–4
–16
TA = 85°C
–12 –8 –4 0
LO INPUT POWER (dBm)
8
6
4
2
0
4
5520 • G06
IIP3 and IIP2 vs
LO Input Power
50
LOW SIDE LO
45
40
IIP2
35
HIGH SIDE LO
30
25
IIP3
20
15
10
HIGH SIDE LO
LOW SIDE LO
5
0
–16 –12 –8 –4
0
LO INPUT POWER (dBm)
4
5520 • G09
Conversion Gain vs IF Input
Power (One Input Tone)
4
3
2
1 TA = –40°C
0
TA = 25°C
–1
–2 TA = 85°C
–3
–4
–5
–6
–16
–12 –8 –4 0 4
IF INPUT POWER (dBm)
5520 • G12
4
IIP3 and IIP2 vs
LO Input Power
50
45 TA = 25°C
40
35
IIP2
30
TA = –40°C
TA = 85°C
25
IIP3
20
15
10
TA = 25°C, TA = –40°C
TA = 85°C
5
0
–16 –12 –8 –4
0
LO INPUT POWER (dBm)
4
5520 • G07
LO-RF Leakage
vs LO Input Power
–10
–20
–30
–40
TA = 25°C
–50
TA = –40°C
TA = 85°C
–60
–16
–12 –8 –4
0
LO INPUT POWER (dBm)
4
5520 • G08
RF Output Power and Output IM3 vs
IF Input Power (Two Input Tones)
10
0
TA = –40°C
–10
TA = 85°C
–20
POUT
–30
TA = 25°C
–40
–50
TA = –40°C
–60
IM3
–70
TA = 85°C
–80
–90
–16
–12 –8 –4
0
IF INPUT POWER (dBm/TONE)
4
5520 • G10
IF, LO and RF Port Return Loss
vs Frequency
0
–5
–10
–15
LO PORT
–20
IF PORT
RF PORT
–25
0
500 1000 1500 2000 2500 3000
FREQUENCY (MHz)
5520 • G13
RF Output Power and Output IM2 vs
IF Input Power (Two Input Tones)
10
0
TA = –40°C
–10
TA = 85°C
–20
POUT
–30
–40
TA = 25°C
TA = –40°C
–50
IM2
–60
TA = 85°C
TA = 25°C
–70
–80
–16
–12 –8 –4
0
IF INPUT POWER (dBm/TONE)
4
5520 • G11
Conversion Gain, IIP3 and IIP2
vs Supply Voltage
8
7 LOW SIDE LO
50
45
6
HIGH SIDE LO
40
5 IIP2 35
4 30
3
2 HIGH SIDE LO
25
IIP3 20
1
0
GAIN
LOW SIDE LO
–1
LOW SIDE AND HIGH SIDE LO
–2
4.0 4.25 4.5 4.75 5.0 5.25
15
10
5
0
5.5
SUPPLY VOLTAGE (V)
5520 • G14
5520f



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