LT5579IUH#TRPBF [Linear]
LT5579 - 1.5GHz to 3.8GHz High Linearity Upconverting Mixer; Package: QFN; Pins: 24; Temperature Range: -40°C to 85°C;型号: | LT5579IUH#TRPBF |
厂家: | Linear |
描述: | LT5579 - 1.5GHz to 3.8GHz High Linearity Upconverting Mixer; Package: QFN; Pins: 24; Temperature Range: -40°C to 85°C 局域网 射频 微波 |
文件: | 总20页 (文件大小:333K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
resultsꢀinꢀlowꢀLOꢀsignalꢀleakageꢀtoꢀtheꢀRFꢀoutput.ꢀAtꢀ2.6GHzꢀ
LT5579
1.5GHz to 3.8GHz
High Linearity
Upconverting Mixer
FeaTures
DescripTion
TheꢀLT®5579ꢀmixerꢀisꢀaꢀhighꢀperformanceꢀupconvertingꢀ
mixerꢀoptimizedꢀforꢀfrequenciesꢀinꢀtheꢀ1.5GHzꢀtoꢀ3.8GHzꢀ
range.ꢀTheꢀsingle-endedꢀLOꢀinputꢀandꢀRFꢀoutputꢀportsꢀ
simplifyꢀboardꢀlayoutꢀandꢀreduceꢀsystemꢀcost.ꢀTheꢀmixerꢀ
needsꢀonlyꢀ–1dBmꢀofꢀLOꢀpowerꢀandꢀtheꢀbalancedꢀdesignꢀ
n
ꢀ High Output IP3: +27.3dBm at 2.14GHz
ꢀ Low Noise Floor: –158dBm/Hz (P
n
= –5dBm)
OUT
n
n
n
n
n
n
n
ꢀ High Conversion Gain: 2.6dB at 2.14GHz
ꢀ Wide Frequency Range: 1.5GHz to 3.8GHz*
ꢀ Low LO Leakage
ꢀ Single-Ended RF and LO
ꢀ Low LO Drive Level: –1dBm
ꢀ Singleꢀ3.3VꢀSupply
ꢀ 5mmꢀ×ꢀ5mmꢀQFN24ꢀPackage
operation,ꢀtheꢀLT5579ꢀprovidesꢀhighꢀconversionꢀgainꢀofꢀ
1.3dB,ꢀhighꢀOIP3ꢀofꢀ+26dBmꢀandꢀaꢀlowꢀnoiseꢀfloorꢀofꢀ
–157.5dBm/Hzꢀatꢀaꢀ–5dBmꢀRFꢀoutputꢀsignalꢀlevel.
TheꢀLT5579ꢀoffersꢀaꢀhighꢀperformanceꢀalternativeꢀtoꢀpas-
siveꢀmixers.ꢀUnlikeꢀpassiveꢀmixers,ꢀwhichꢀhaveꢀconversionꢀ
lossꢀandꢀrequireꢀhighꢀLOꢀdriveꢀlevels,ꢀtheꢀLT5579ꢀdeliversꢀ
conversionꢀgainꢀatꢀsignificantlyꢀlowerꢀLOꢀinputꢀlevelsꢀandꢀ
isꢀlessꢀsensitiveꢀtoꢀLOꢀpowerꢀlevelꢀvariations.ꢀTheꢀlowerꢀ
LOꢀdriveꢀlevelꢀrequirements,ꢀcombinedꢀwithꢀtheꢀexcellentꢀ
LOꢀleakageꢀperformance,ꢀtranslateꢀintoꢀlowerꢀLOꢀsignalꢀ
contaminationꢀofꢀtheꢀoutputꢀsignal.
applicaTions
ꢀ GSM/EDGE,ꢀW-CDMA,ꢀUMTS,ꢀLTEꢀandꢀTD-SCDMAꢀ
n
Basestations
n
ꢀ 2.6GHzꢀandꢀ3.5GHzꢀWiMAXꢀBasestations
n
ꢀ 2.4GHzꢀISMꢀBandꢀTransmitters
n
ꢀ HighꢀPerformanceꢀTransmitters
L,ꢀLT,ꢀLTC,ꢀLTM,ꢀLinearꢀTechnologyꢀandꢀtheꢀLinearꢀlogoꢀareꢀregisteredꢀtrademarksꢀofꢀLinearꢀ
TechnologyꢀCorporation.ꢀAllꢀotherꢀtrademarksꢀareꢀtheꢀpropertyꢀofꢀtheirꢀrespectiveꢀowners.
*Operationꢀoverꢀwiderꢀfrequencyꢀrangeꢀisꢀpossibleꢀwithꢀreducedꢀperformance.ꢀꢀ
ConsultꢀLinearꢀTechnologyꢀforꢀinformationꢀandꢀassistance.
Typical applicaTion
Frequency Upconversion in 2.14GHz W-CDMA Transmitter
LO INPUT
–1dBm (TYP)
Gain, NF and OIP3 vs
RF Output Frequency
LO
30
LT5579
OIP3
25
T
= 25°C
= 3.3V
= 240MHz
= f + f
A
CC
V
GND
20
15
f
f
IF
BIAS
11Ω
LO RF IF
IF
RF
OUTPUT
2140MHz
SSB NF
GAIN
INPUT
40nH
MABAES0061
4:1
10
5
82pF
82pF
240MHz
3.9nH
+
–
IF
RF
0.45pF
33pF
IF
0
1900 2000
2100
2200
2300
2400
40nH
11Ω
RF FREQUENCY (MHz)
V
CC
5579 TA01a
5579 TA01b
V
CC
3.3V
1µF
100pF
1nF
5579fa
ꢀ
18 GND
IFꢀInputꢀPowerꢀ(Differential)............................... +13dBm
SupplyꢀVoltage............................................................4V
LT5579
absoluTe MaxiMuM raTings
pin conFiguraTion
TOP VIEW
(Note 1)
LOꢀInputꢀPowerꢀ.................................................. +10dBm
24 23 22 21 20 19
LOꢀInputꢀDCꢀVoltage........................ –0.3VꢀtoꢀV ꢀ+ꢀ0.3V
CC
GND
GND
1
2
3
4
5
6
RFꢀOutputꢀDCꢀCurrentꢀ........................................... 60mA
GND
GND
17
16
+
IF
+
–
IF ,ꢀIF ꢀDCꢀCurrentsꢀ.............................................. 60mA
ꢀ.................................................................... 150°C
25
–
IF
15 RF
T
JMAX
GND
GND
14 GND
13 GND
OperatingꢀTemperatureꢀRangeꢀ.................–40°Cꢀtoꢀ85°C
StorageꢀTemperatureꢀRangeꢀ.................. –65°Cꢀtoꢀ150°C
7
8
9 10 11 12
UH PACKAGE
24-LEAD (5mm s 5mm) PLASTIC QFN
ꢀ
T ꢀ=ꢀ150°C,ꢀθ ꢀ=ꢀ34°C/W,ꢀθ ꢀ=ꢀ3°C/Wꢀ
JMAX JA JC
EXPOSEDꢀPADꢀ(PINꢀ25)ꢀISꢀGND,ꢀMUSTꢀBEꢀSOLDEREDꢀTOꢀPCB
orDer inForMaTion
LEAD FREE FINISH
TAPE AND REEL
PART MARKING
PACKAGE DESCRIPTION
24-Leadꢀ(5mmꢀ×ꢀ5mm)ꢀPlasticꢀQFN
TEMPERATURE RANGE
–40°Cꢀtoꢀ85°C
LT5579IUH#PBF
LT5579IUH#TRPBF
5579
ConsultꢀLTCꢀMarketingꢀforꢀpartsꢀspecifiedꢀwithꢀwiderꢀoperatingꢀtemperatureꢀranges.ꢀ
ConsultꢀLTCꢀMarketingꢀforꢀinformationꢀonꢀnon-standardꢀleadꢀbasedꢀfinishꢀparts.
Forꢀmoreꢀinformationꢀonꢀleadꢀfreeꢀpartꢀmarking,ꢀgoꢀto:ꢀhttp://www.linear.com/leadfree/ꢀꢀ
Forꢀmoreꢀinformationꢀonꢀtapeꢀandꢀreelꢀspecifications,ꢀgoꢀto:ꢀhttp://www.linear.com/tapeandreel/
VCC = 3.3V, TA = 25°C (Note 3), unless otherwise noted.
Dc elecTrical characTerisTics
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Power Supply Requirements (V
SupplyꢀVoltage
)
CC
3.15
3.3
3.6
V
DC
SupplyꢀCurrent
V
CC
V
CC
ꢀ=ꢀ3.3V,ꢀP ꢀ=ꢀ–1dBmꢀ
226ꢀ
241
250
mAꢀ
mA
LO
ꢀ=ꢀ3.6V,ꢀP ꢀ=ꢀ–1dBm
LO
InputꢀCommonꢀModeꢀVoltageꢀ(V
)
CM
InternallyꢀRegulated
570
mV
ac elecTrical characTerisTics (Notes 2, 3)
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
MHz
IFꢀInputꢀFrequencyꢀRangeꢀ(Noteꢀ4)
LOꢀInputꢀFrequencyꢀRangeꢀ(Noteꢀ4)
RFꢀOutputꢀFrequencyꢀRangeꢀ(Noteꢀ4)
RequiresꢀMatching
RequiresꢀMatchingꢀBelowꢀ1GHz
RequiresꢀMatching
LFꢀtoꢀ1000
750ꢀtoꢀ4300
900ꢀtoꢀ3900
MHz
MHz
5579fa
ꢁ
LT5579
VCC = 3.3V, TA = 25°C, PIF = –5dBm (–5dBm/tone for 2-tone tests,
ac elecTrical characTerisTics
∆f = 1MHz), PLO = –1dBm, unless otherwise noted. Test circuits are shown in Figure 1. (Notes 2, 3)
PARAMETER
CONDITIONS
Z ꢀ=ꢀ50Ω,ꢀExternalꢀMatch
MIN
TYP
15
MAX
UNITS
dB
IFꢀInputꢀReturnꢀLoss
LOꢀInputꢀReturnꢀLoss
RFꢀOutputꢀReturnꢀLoss
LOꢀInputꢀPower
O
Z ꢀ=ꢀ50Ω,ꢀ1100MHzꢀtoꢀ4000MHz
O
>9
dB
Z ꢀ=ꢀ50Ω,ꢀExternalꢀMatch
O
>10
dB
–5ꢀtoꢀ2
dBm
VCC = 3.3V, TA = 25°C, PIF = –5dBm (–5dBm/tone for 2-tone tests, ∆f = 1MHz), PLO = –1dBm, unless otherwise noted.
Low side LO for 1750MHz and 3600MHz. High side LO for 2140MHz and 2600MHz. (Notes 2, 3, 4)
PARAMETER
ConversionꢀGain
CONDITIONS
f ꢀ=ꢀ240MHz,ꢀf ꢀ=ꢀ1750MHzꢀ
MIN
TYP
MAX
UNITS
1.8ꢀ
2.6ꢀ
1.3ꢀ
–0.5
dBꢀ
dBꢀ
dBꢀ
dB
IF
RF
f ꢀ=ꢀ240MHz,ꢀf ꢀ=ꢀ2140MHzꢀ
IF
RF
f ꢀ=ꢀ456MHz,ꢀf ꢀ=ꢀ2600MHzꢀ
IF
RF
f ꢀ=ꢀ456MHz,ꢀf ꢀ=ꢀ3600MHz
IF
RF
ConversionꢀGainꢀvsꢀTemperatureꢀꢀ
A
f ꢀ=ꢀ240MHz,ꢀf ꢀ=ꢀ1750MHzꢀ
–0.020ꢀ
–0.020ꢀ
–0.027ꢀ
–0.027
dB/°Cꢀ
dB/°Cꢀ
dB/°Cꢀ
dB/°C
IF
RF
(T ꢀ=ꢀ–40°Cꢀtoꢀ85°C)
f ꢀ=ꢀ240MHz,ꢀf ꢀ=ꢀ2140MHzꢀ
IF RF
f ꢀ=ꢀ456MHz,ꢀf ꢀ=ꢀ2600MHzꢀ
IF
RF
f ꢀ=ꢀ456MHz,ꢀf ꢀ=ꢀ3600MHz
IF
RF
Outputꢀ3rdꢀOrderꢀIntercept
Outputꢀ2ndꢀOrderꢀIntercept
SingleꢀSidebandꢀNoiseꢀFigure
f ꢀ=ꢀ240MHz,ꢀf ꢀ=ꢀ1750MHzꢀ
29ꢀ
dBmꢀ
dBmꢀ
dBmꢀ
dBm
dBmꢀ
dBmꢀ
dBmꢀ
dBm
dBꢀ
dBꢀ
dBꢀ
dB
IF
RF
f ꢀ=ꢀ240MHz,ꢀf ꢀ=ꢀ2140MHzꢀ
27.3ꢀ
26.2ꢀ
23.2
IF
RF
f ꢀ=ꢀ456MHz,ꢀf ꢀ=ꢀ2600MHzꢀ
IF
RF
f ꢀ=ꢀ456MHz,ꢀf ꢀ=ꢀ3600MHz
IF
RF
f ꢀ=ꢀ240MHz,ꢀf ꢀ=ꢀ1750MHzꢀ
41ꢀ
42ꢀ
45ꢀ
54
9.2ꢀ
9.9ꢀ
12ꢀ
12
IF
RF
f ꢀ=ꢀ240MHz,ꢀf ꢀ=ꢀ2140MHzꢀ
IF
RF
f ꢀ=ꢀ456MHz,ꢀf ꢀ=ꢀ2600MHzꢀ
IF
RF
f ꢀ=ꢀ456MHz,ꢀf ꢀ=ꢀ3600MHz
IF
RF
f ꢀ=ꢀ240MHz,ꢀf ꢀ=ꢀ1750MHzꢀ
IF
RF
f ꢀ=ꢀ240MHz,ꢀf ꢀ=ꢀ2140MHzꢀ
IF
RF
f ꢀ=ꢀ456MHz,ꢀf ꢀ=ꢀ2600MHzꢀ
IF
RF
f ꢀ=ꢀ456MHz,ꢀf ꢀ=ꢀ3600MHz
IF
RF
OutputꢀNoiseꢀFloorꢀ(P ꢀ=ꢀ–5dBm)
f ꢀ=ꢀ240MHz,ꢀf ꢀ=ꢀ1750MHzꢀ
–159.5ꢀ
–158.1ꢀ
–157.5ꢀ
–155.5
dBm/Hzꢀ
dBm/Hzꢀ
dBm/Hzꢀ
dBm/Hz
OUT
IF
RF
f ꢀ=ꢀ240MHz,ꢀf ꢀ=ꢀ2140MHzꢀ
IF
RF
f ꢀ=ꢀ456MHz,ꢀf ꢀ=ꢀ2600MHzꢀ
IF
RF
f ꢀ=ꢀ456MHz,ꢀf ꢀ=ꢀ3600MHz
IF
RF
Outputꢀ1dBꢀCompression
IFꢀtoꢀLOꢀIsolation
f ꢀ=ꢀ240MHz,ꢀf ꢀ=ꢀ1750MHzꢀ
13.3ꢀ
13.9ꢀ
13.7ꢀ
10.7
83ꢀ
81ꢀ
74ꢀ
73
dBmꢀ
dBmꢀ
dBmꢀ
dBm
dBꢀ
dBꢀ
dBꢀ
dB
IF
RF
f ꢀ=ꢀ240MHz,ꢀf ꢀ=ꢀ2140MHzꢀ
IF
RF
f ꢀ=ꢀ456MHz,ꢀf ꢀ=ꢀ2600MHzꢀ
IF
RF
f ꢀ=ꢀ456MHz,ꢀf ꢀ=ꢀ3600MHz
IF
RF
f ꢀ=ꢀ240MHz,ꢀf ꢀ=ꢀ1750MHzꢀ
IF
RF
f ꢀ=ꢀ240MHz,ꢀf ꢀ=ꢀ2140MHzꢀ
IF
RF
f ꢀ=ꢀ456MHz,ꢀf ꢀ=ꢀ2600MHzꢀ
IF
RF
f ꢀ=ꢀ456MHz,ꢀf ꢀ=ꢀ3600MHz
IF
RF
LOꢀtoꢀIFꢀLeakage
f ꢀ=ꢀ240MHz,ꢀf ꢀ=ꢀ1750MHzꢀ
–23ꢀ
–28ꢀ
–26ꢀ
–22
dBmꢀ
ꢀdBmꢀ
dBmꢀ
dBm
IF
RF
f ꢀ=ꢀ240MHz,ꢀf ꢀ=ꢀ2140MHzꢀ
IF
RF
f ꢀ=ꢀ456MHz,ꢀf ꢀ=ꢀ2600MHzꢀ
IF
RF
f ꢀ=ꢀ456MHz,ꢀf ꢀ=ꢀ3600MHz
IF
RF
LOꢀtoꢀRFꢀLeakage
f ꢀ=ꢀ240MHz,ꢀf ꢀ=ꢀ1750MHzꢀ
–39ꢀ
–35ꢀ
–36ꢀ
–35
dBmꢀ
dBmꢀ
dBmꢀ
dBm
IF
RF
f ꢀ=ꢀ240MHz,ꢀf ꢀ=ꢀ2140MHzꢀ
IF
RF
f ꢀ=ꢀ456MHz,ꢀf ꢀ=ꢀ2600MHzꢀ
IF
RF
f ꢀ=ꢀ456MHz,ꢀf ꢀ=ꢀ3600MHz
IF
RF
Note 1:ꢀStressesꢀbeyondꢀthoseꢀlistedꢀunderꢀAbsoluteꢀMaximumꢀRatingsꢀ
mayꢀcauseꢀpermanentꢀdamageꢀtoꢀtheꢀdevice.ꢀExposureꢀtoꢀanyꢀAbsoluteꢀ
MaximumꢀRatingꢀconditionꢀforꢀextendedꢀperiodsꢀmayꢀaffectꢀdeviceꢀ
reliabilityꢀandꢀlifetime.
Note 3:ꢀTheꢀLT5579ꢀisꢀguaranteedꢀfunctionalꢀoverꢀtheꢀoperatingꢀ
temperatureꢀrangeꢀfromꢀ–40°Cꢀtoꢀ85°C.
Note 4:ꢀSSBꢀnoiseꢀfigureꢀmeasurementsꢀperformedꢀwithꢀaꢀsmall-signalꢀ
noiseꢀsourceꢀandꢀbandpassꢀfilterꢀonꢀLOꢀsignalꢀgenerator.ꢀNoꢀotherꢀIFꢀsignalꢀ
applied.
Note 2:ꢀEachꢀsetꢀofꢀfrequencyꢀconditionsꢀrequiresꢀappropriateꢀmatchingꢀ
(seeꢀFigureꢀ1).
5579fa
ꢂ
LT5579
(Test Circuit Shown in Figure 1)
Typical Dc perForMance characTerisTics
Supply Current vs Supply Voltage
255
245
235
225
215
85°C
25°C
–40°C
205
195
3.0
3.2
3.3
3.4
3.5
3.6
3.1
SUPPLY VOLTAGE (V)
5579 G01
3300MHz to 3800MHz Application:
VCC = 3.3V, TA = 25°C, fIF = 456MHz, PIF = –5dBm (–5dBm/tone for 2-tone tests, ∆f = 1MHz), low side LO, PLO = –1dBm,
Typical ac perForMance characTerisTics
output measured at 3600MHz, unless otherwise noted. (Test circuit shown in Figure 1)
SSB Noise Figure Distribution at
3600MHz
Gain Distribution at 3600MHz
OIP3 Distribution at 3600MHz
30
25
16
25
T
T
T
= 90°C
= 25°C
= –45°C
T
T
T
= 90°C
= 25°C
= –45°C
T
T
T
= 90°C
= 25°C
= –45°C
A
A
A
A
A
A
A
A
A
14
12
20
15
20
15
10
8
10
5
6
10
5
4
2
0
0
0
10
11
12
NOISE FIGURE (dB)
13
14
20
21
23
22
OIP3 (dBm)
24
25
26
19
–0.5
–2.5 –2.0 –1.5 –1.0
0
0.5 1.0 1.5
GAIN (dB)
5579 G04
5579 G03
5579 G02
5579fa
ꢃ
LT5579
Typical ac perForMance characTerisTics
output measured at 3600MHz, unless otherwise noted. (Test circuit shown in Figure 1)
3300MHz to 3800MHz Application:
VCC = 3.3V, TA = 25°C, fIF = 456MHz, PIF = –5dBm (–5dBm/tone for 2-tone tests, ∆f = 1MHz), low side LO, PLO = –1dBm,
Conversion Gain and OIP3
vs RF Output Frequency
SSB Noise Figure
LO-RF Leakage
vs RF Output Frequency
vs RF Output Frequency
16
12
8
28
24
20
16
12
8
20
0
–10
–20
–30
–40
–50
18
16
OIP3
14
12
10
8
85°C
25°C
–40°C
4
GAIN
0
85°C
25°C
–40°C
85°C
25°C
–40°C
6
–4
4
3200 3300 3400 3500 3600 3700 3800 3900
RF FREQUENCY (MHz)
3300 3400
3600 3700 3800 3900
3200
3500
3200 3300 3400 3500 3600 3700 3800 3900
RF FREQUENCY (MHz)
RF FREQUENCY (MHz)
5579 G05
5579 G06
5579 G07
Conversion Gain and OIP3
vs LO Input Power
SSB Noise Figure
vs LO Input Power
Conversion Gain and OIP3
vs Supply Voltage
16
12
8
26
16
26
22
18
14
10
6
20
18
16
14
12
10
8
22
12
8
OIP3
GAIN
OIP3
18
85°C
85°C
25°C
–40°C
25°C
–40°C
4
14
4
GAIN
0
10
0
85°C
6
25°C
–40°C
–4
6
–4
4
3.0
3.2
3.3
3.4
3.5
3.6
3.1
–13
–9
–5
–1
3
–14
–10
–6
LO INPUT POWER (dBm)
–2
2
–17
SUPPLY VOLTAGE (V)
LO INPUT POWER (dBm)
5579 G10
5579 G08
5579 G09
IM3 Level
vs RF Output Power (2-Tone)
IM2 Level
vs RF Output Power (2-Tone)
SSB Noise Figure
vs Supply Voltage
20
0
0
18
16
14
12
10
8
–20
–20
–40
–40
–60
–80
–60
–80
85°C
25°C
–40°C
85°C
25°C
–40°C
85°C
25°C
–40°C
6
–100
–100
4
–12 –10 –8 –6 –4 –2
0
2
4
6
–12 –10 –8 –6 –4 –2
0
2
4
6
3.0
3.1
3.2
3.4
3.5
3.6
3.3
RF OUTPUT POWER (dBm/TONE)
RF OUTPUT POWER (dBm/TONE)
SUPPLY VOLTAGE (V)
5579 G11
5579 G12
5579 G13
5579fa
ꢄ
LT5579
Typical ac perForMance characTerisTics 2300MHz to 2700MHz Application:
VCC = 3.3V, TA = 25°C, fIF = 456MHz, PIF = –5dBm (–5dBm/tone for 2-tone tests, ∆f = 1MHz), high side LO, PLO = –1dBm,
output measured at 2600MHz, unless otherwise noted. (Test circuit shown in Figure 1)
Conversion Gain and OIP3
vs RF Output Frequency
SSB Noise Figure
LO-RF Leakage
vs RF Output Frequency
vs RF Output Frequency
0
–10
–20
–30
–40
–50
16
12
8
30
26
22
18
14
10
18
16
14
12
85°C
25°C
–40°C
OIP3
GAIN
85°C
25°C
–40°C
10
8
4
6
4
2
0
85°C
25°C
–40°C
–4
2300 2400
2600
2200 2300 2400 2500 2600 2700 2800
RF FREQUENCY (MHz)
2200
2700 2800
2200
2400 2500 2600 2700 2800
RF FREQUENCY (MHz)
2500
2300
RF FREQUENCY (MHz)
5579 G16
5579 G15
5579 G14
Conversion Gain and OIP3
vs LO Input Power
SSB Noise Figure
vs LO Input Power
Conversion Gain and OIP3
vs Supply Voltage
16
12
8
28
16
28
24
20
16
12
8
18
16
14
12
10
8
OIP3
24
12
8
OIP3
GAIN
85°C
85°C
25°C
–40°C
25°C
20
16
12
8
–40°C
GAIN
4
4
6
0
0
85°C
25°C
–40°C
4
–4
–4
2
3.0
3.2
3.3
3.4
3.5
3.6
3.1
–17
–13
–9
–5
–1
3
–6
LO INPUT POWER (dBm)
–14
–10
–2
2
SUPPLY VOLTAGE (V)
LO INPUT POWER (dBm)
5579 G19
5579 G17
5579 G18
IM3 Level
vs RF Output Power (2-Tone)
IM2 Level
vs RF Output Power (2-Tone)
SSB Noise Figure
vs Supply Voltage
0
18
16
14
12
0
–20
–20
–40
–40
10
8
–60
–80
–60
–80
6
4
2
85°C
85°C
25°C
–40°C
85°C
25°C
–40°C
25°C
–40°C
–100
–100
3.1
3.2
3.4
–12 –10 –8 –6 –4 –2
0
2
4
6
3.0
3.3
3.5
3.6
–12 –10 –8 –6 –4 –2
0
2
4
6
RF OUTPUT POWER (dBm/TONE)
RF OUTPUT POWER (dBm/TONE)
SUPPLY VOLTAGE (V)
5579 G22
5579 G20
5579 G21
5579fa
ꢅ
LT5579
Typical perForMance characTerisTics 2140MHz Application:
VCC = 3.3V, TA = 25°C, fIF = 240MHz, PIF = –5dBm (–5dBm/tone for 2-tone tests, ∆f = 1MHz), high side LO, PLO = –1dBm,
output measured at 2140MHz, unless otherwise noted. (Test circuit shown in Figure 1)
Conversion Gain and OIP3
vs RF Output Frequency
SSB Noise Figure
vs RF Output Frequency
LO-RF Leakage
vs RF Output Frequency
18
16
14
12
10
8
0
–10
–20
–30
–40
–50
16
12
8
30
26
22
18
14
10
OIP3
GAIN
4
6
0
85°C
25°C
–40°C
85°C
25°C
–40°C
85°C
25°C
–40°C
4
2
–4
2150
RF FREQUENCY (MHz)
1950
2050
2250
2350
1950
2050
2150
2250
2050
2150
2250
2350
1950
2350
RF FREQUENCY (MHz)
RF FREQUENCY (MHz)
5579 G24
5579 G25
5579 G23
Conversion Gain and OIP3
vs LO Input Power
SSB Noise Figure
vs LO Input Power
Conversion Gain and OIP3
vs Supply Voltage
16
12
8
30
26
22
18
14
10
18
16
14
12
10
8
16
12
8
30
26
22
18
14
10
OIP3
GAIN
OIP3
GAIN
4
4
6
0
0
85°C
85°C
25°C
–40°C
85°C
25°C
–40°C
4
25°C
–40°C
–4
2
–4
–13
–9
–5
–1
3
–14
–10
–6
LO INPUT POWER (dBm)
–2
2
–17
3.0
3.2
3.3
3.4
3.5
3.6
3.1
SUPPLY VOLTAGE (V)
LO INPUT POWER (dBm)
5579 G26
5579 G27
5579 G19
IM3 Level
vs RF Output Power (2-Tone)
IM2 Level
vs RF Output Power (2-Tone)
SSB Noise Figure
vs Supply Voltage
18
16
14
0
0
–20
–40
–20
–40
12
10
8
–60
–80
–60
–80
6
85°C
25°C
–40°C
85°C
25°C
85°C
25°C
–40°C
4
2
–40°C
–100
–100
–2
RF OUTPUT POWER (dBm/TONE)
–2
RF OUTPUT POWER (dBm/TONE)
3.1
3.2
3.4
–10 –8 –6 –4
0
2
4
6
–10 –8 –6 –4
0
2
4
6
3.0
3.5
3.6
3.3
SUPPLY VOLTAGE (V)
5579 G29
5579 G30
5579 G31
5579fa
ꢆ
LT5579
Typical perForMance characTerisTics 1750MHz Application:
VCC = 3.3V, TA = 25°C, fIF = 240MHz, PIF = –5dBm (–5dBm/tone for 2-tone tests, ∆f = 1MHz), low side LO, PLO = –1dBm,
output measured at 1750MHz, unless otherwise noted. (Test circuit shown in Figure 1)
Conversion Gain and OIP3
vs RF Output Frequency
SSB Noise Figure
vs RF Output Frequency
LO-RF Leakage
vs RF Output Frequency
16
12
8
30
26
22
18
14
10
18
16
14
12
0
–10
–20
–30
–40
–50
85°C
25°C
–40°C
OIP3
GAIN
85°C
25°C
–40°C
10
8
4
6
4
2
0
85°C
25°C
–40°C
–4
1700
1750
RF FREQUENCY (MHz)
1850
1650
1700
1750
1800
1850
1900
1650
1900
1800
1650
1700
1750
1800
1850
1900
RF FREQUENCY (MHz)
RF FREQUENCY (MHz)
5579 G32
5579 G33
5579 G34
Conversion Gain and OIP3
vs LO Input Power
SSB Noise Figure
vs LO Input Power
Conversion Gain and OIP3
vs Supply Voltage
16
12
8
32
28
24
20
16
12
16
12
8
30
26
22
18
14
10
18
16
14
12
OIP3
OIP3
GAIN
85°C
25°C
–40°C
10
8
GAIN
4
4
6
4
2
0
0
85°C
25°C
–40°C
85°C
25°C
–40°C
–4
–4
–13
–9
–1
–17
3
3.0
3.5
3.6
–5
3.2
3.3
3.4
–17
–13
–9
–5
–1
3
3.1
SUPPLY VOLTAGE (V)
LO INPUT POWER (dBm)
LO INPUT POWER (dBm)
5579 G36
5579 G37
5579 G35
IM3 Level
vs RF Output Power (2-Tone)
IM2 Level
vs RF Output Power (2-Tone)
SSB Noise Figure
vs Supply Voltage
0
0
18
16
14
12
–20
–40
–20
–40
10
8
–60
–80
–60
–80
6
4
2
85°C
25°C
–40°C
85°C
85°C
25°C
25°C
–40°C
–40°C
–100
–100
3.1
3.2
3.4
–2
RF OUTPUT POWER (dBm/TONE)
3.0
3.5
3.6
–10 –8 –6 –4
0
2
4
6
3.3
–2
RF OUTPUT POWER (dBm/TONE)
–10 –8 –6 –4
0
2
4
6
SUPPLY VOLTAGE (V)
5579 G40
5579 G39
5579 G38
5579fa
ꢇ
LT5579
pin FuncTions
GND(Pins1,2,5-7,12-14,16-18,19-21,23,24):ꢀGroundꢀ
Connections.ꢀTheseꢀpinsꢀareꢀinternallyꢀconnectedꢀtoꢀtheꢀ
exposedꢀpadꢀandꢀshouldꢀbeꢀsolderedꢀtoꢀaꢀlowꢀimpedanceꢀ
RFꢀgroundꢀonꢀtheꢀprintedꢀcircuitꢀboard.ꢀ
RF (Pin 15):ꢀSingle-EndedꢀRFꢀOutput.ꢀThisꢀpinꢀisꢀcon-
nectedꢀtoꢀanꢀinternalꢀtransformerꢀwinding.ꢀTheꢀoppositeꢀ
endꢀofꢀtheꢀwindingꢀisꢀgroundedꢀinternally.ꢀAnꢀimpedanceꢀ
transformationꢀmayꢀbeꢀrequiredꢀtoꢀmatchꢀtheꢀoutputꢀandꢀaꢀ
DCꢀdecouplingꢀcapacitorꢀisꢀrequiredꢀifꢀtheꢀfollowingꢀstageꢀ
hasꢀaꢀDCꢀbiasꢀvoltageꢀpresent.ꢀ
+
–
IF , IF (Pins 3, 4):ꢀDifferentialꢀIFꢀInput.ꢀTheꢀcommonꢀ
modeꢀvoltageꢀonꢀtheseꢀpinsꢀisꢀsetꢀinternallyꢀtoꢀ570mV.ꢀTheꢀ
DCꢀcurrentꢀfromꢀeachꢀpinꢀisꢀdeterminedꢀbyꢀtheꢀvalueꢀofꢀ
anꢀexternalꢀresistorꢀtoꢀground.ꢀTheꢀmaximumꢀDCꢀcurrentꢀ
throughꢀeachꢀpinꢀisꢀ60mA.ꢀ
LO(Pin22):ꢀSingle-EndedꢀLocalꢀOscillatorꢀInput.ꢀAnꢀinternalꢀ
seriesꢀcapacitorꢀactsꢀasꢀaꢀDCꢀblockꢀtoꢀthisꢀpin.
Exposed Pad (Pin 25):ꢀ PGND.ꢀ Electricalꢀ andꢀ thermalꢀ
groundꢀconnectionꢀforꢀtheꢀentireꢀIC.ꢀThisꢀpadꢀmustꢀbeꢀ
solderedꢀtoꢀaꢀlowꢀimpedanceꢀRFꢀgroundꢀonꢀtheꢀprintedꢀ
circuitꢀboard.ꢀThisꢀgroundꢀmustꢀalsoꢀprovideꢀaꢀpathꢀforꢀ
thermalꢀdissipation.ꢀ
V
(Pins 8-11):ꢀPowerꢀSupplyꢀPinsꢀforꢀtheꢀIC.ꢀTheseꢀ
CC
pinsꢀ areꢀ connectedꢀ togetherꢀ internally.ꢀ Typicalꢀ currentꢀ
consumptionꢀisꢀ226mA.ꢀTheseꢀpinsꢀshouldꢀbeꢀconnectedꢀ
togetherꢀonꢀtheꢀcircuitꢀboardꢀwithꢀexternalꢀbypassꢀcapaci-
torsꢀofꢀ1000pF,ꢀ100pFꢀandꢀ10pFꢀlocatedꢀasꢀcloseꢀtoꢀtheꢀ
pinsꢀasꢀpossible.
5579fa
ꢈ
LT5579
block DiagraM
25
EXPOSED
PAD
15
RF
V
CC
V
CC
V
CC
V
CC
11
10
9
LO
22
DOUBLE
BALANCED
MIXER
LO BUFFER
V
CC2
BIAS
8
V
CC2
V
CM
CTRL
+
–
IF
IF
3
4
5579 BD
GND PINS ARE NOT SHOWN
5579fa
ꢀ0
LT5579
TesT circuiT
LO INPUT
R1
L1
24 23 22 21 20 19
1
2
3
4
5
6
18
17
16
15
14
13
T1
4:1
GND
GND
GND
C1
C2
TL1
TL2
GND
GND
RF
RF
OUTPUT
+
IF
INPUT
IF
L3
TL3
C9
C3
GND
–
IF
C8
GND
GND
GND
GND
L2
R2
7
8
9
10 11 12
V
CC
C4
C5
C6
C7
5579 F01
f
= 1750MHz
= 240MHz
f
= 2140MHz
= 240MHz
f
= 2600MHz
= 456MHz
f
= 3600MHz
= 456MHz
RF
IF
RF
IF
RF
IF
RF
IF
REF DES
C1,ꢀC2
C3
f
f
f
f
SIZE
COMMENTS
AVX
82pF
—
82pF
—
33pF
2.7pF
100pF
10pF
1nF
33pF
1.8pF
100pF
10pF
1nF
0402
0402
0402
0603
0402
0603
0402
0402
0402
0402
0603
SM-22
—
AVX
C4
100pF
10pF
1nF
100pF
10pF
1nF
AVXꢀ
C5
AVX
C6
AVX
C7
1µF
1µF
1µF
1µF
TaiyoꢀYudenꢀLMK107BJ105MA
AVXꢀACCU-P
C8
1.2pF
33pF
40nH
6.8nH
0.45pF
33pF
40nH
3.9nH
—
0.7pF
33pF
40nH
0Ω
C9
33pF
40nH
1nH
AVX
L1,ꢀL2
L3
Coilcraftꢀ0402CS
TokoꢀLL1005-FHL/0ΩꢀJumper
IRCꢀPFC-W0603R-03-11R1-B
M/A-COMꢀMABAES0061
R1,ꢀR2
T1
11Ω,ꢀ0.1%
4:1
11Ω,ꢀ0.1%
4:1
11Ω,ꢀ0.1%
4:1
11Ω,ꢀ0.1%
4:1
TL1,ꢀTL2*
TL3
—
—
1mm
1.4mm
2mm
Z ꢀ=ꢀ70ΩꢀMicrostrip
O
2mm
2mm
2mm
—
Z ꢀ=ꢀ70ΩꢀMicrostrip
O
*Center-to-centerꢀspacingꢀbetweenꢀC9ꢀandꢀC3.ꢀCenterꢀofꢀC9ꢀisꢀ2.6mmꢀfromꢀtheꢀedgeꢀofꢀtheꢀICꢀpackageꢀforꢀallꢀcases.
Figure 1. Test Circuit Schematic
5579fa
ꢀꢀ
LT5579
applicaTions inForMaTion
TheꢀLT5579ꢀusesꢀaꢀhighꢀperformanceꢀLOꢀbufferꢀamplifierꢀ Theꢀpurposeꢀofꢀtheꢀinductorsꢀ(L1ꢀandꢀL2)ꢀisꢀtoꢀreduceꢀtheꢀ
drivingꢀaꢀdouble-balancedꢀmixerꢀcoreꢀtoꢀachieveꢀfrequencyꢀ loadingꢀeffectsꢀofꢀR1ꢀandꢀR2.ꢀTheꢀimpedancesꢀofꢀL1ꢀandꢀL2ꢀ
conversionꢀwithꢀhighꢀlinearity.ꢀInternalꢀbalunsꢀareꢀusedꢀtoꢀ shouldꢀbeꢀatꢀleastꢀseveralꢀtimesꢀgreaterꢀthanꢀtheꢀIFꢀinputꢀ
provideꢀsingle-endedꢀLOꢀinputꢀandꢀRFꢀoutputꢀports.ꢀTheꢀ impedanceꢀatꢀtheꢀdesiredꢀIFꢀfrequency.ꢀTheꢀself-resonantꢀ
IFꢀinputꢀisꢀdifferential.ꢀTheꢀLT5579ꢀisꢀintendedꢀforꢀopera-
frequencyꢀofꢀtheꢀinductorsꢀshouldꢀalsoꢀbeꢀatꢀleastꢀseveralꢀ
tionꢀinꢀtheꢀ1.5GHzꢀtoꢀ3.8GHzꢀfrequencyꢀrange,ꢀthoughꢀ timesꢀtheꢀIFꢀfrequency.ꢀNoteꢀthatꢀtheꢀDCꢀresistancesꢀofꢀ
operationꢀ outsideꢀ thisꢀ rangeꢀ isꢀ possibleꢀ withꢀ reducedꢀ L1ꢀandꢀL2ꢀwillꢀaffectꢀtheꢀDCꢀcurrentꢀandꢀmayꢀneedꢀtoꢀbeꢀ
performance.ꢀ
accountedꢀforꢀinꢀtheꢀselectionꢀofꢀR1ꢀandꢀR2.
L1ꢀandꢀL2ꢀshouldꢀconnectꢀtoꢀtheꢀsignalꢀlinesꢀasꢀcloseꢀtoꢀ
theꢀpackageꢀasꢀpossible.ꢀThisꢀlocationꢀwillꢀbeꢀatꢀtheꢀlowestꢀ
impedanceꢀpoint,ꢀwhichꢀwillꢀminimizeꢀtheꢀsensitivityꢀofꢀtheꢀ
performanceꢀtoꢀtheꢀloadingꢀofꢀtheꢀshuntꢀL-Rꢀbranches.
IF Input Interface
TheꢀIFꢀinputsꢀareꢀtiedꢀtoꢀtheꢀemittersꢀofꢀtheꢀdouble-balancedꢀ
mixerꢀtransistors,ꢀasꢀshownꢀinꢀFigureꢀ2.ꢀTheseꢀpinsꢀareꢀ
internallyꢀbiasedꢀtoꢀaꢀcommonꢀmodeꢀvoltageꢀofꢀ570mV.ꢀ
TheꢀoptimumꢀDCꢀcurrentꢀinꢀtheꢀmixerꢀcoreꢀisꢀapproximatelyꢀ
50mAꢀperꢀside,ꢀandꢀisꢀsetꢀbyꢀtheꢀexternalꢀresistors,ꢀR1ꢀandꢀ
R2.ꢀTheꢀinductorsꢀandꢀresistorsꢀmustꢀbeꢀableꢀtoꢀhandleꢀ
theꢀanticipatedꢀcurrentꢀandꢀpowerꢀdissipation.ꢀForꢀbestꢀ
LOꢀleakageꢀperformanceꢀtheꢀboardꢀlayoutꢀmustꢀbeꢀsym-
CapacitorsꢀC1ꢀandꢀC2ꢀareꢀusedꢀtoꢀcancelꢀoutꢀtheꢀparasiticꢀ
seriesꢀinductanceꢀofꢀtheꢀIFꢀtransformer.ꢀTheyꢀalsoꢀprovideꢀ
DCꢀisolationꢀbetweenꢀtheꢀIFꢀportsꢀtoꢀpreventꢀunwantedꢀinter-
actionsꢀthatꢀcanꢀaffectꢀtheꢀLOꢀtoꢀRFꢀleakageꢀperformance.ꢀ
Theꢀdifferentialꢀinputꢀresistanceꢀtoꢀtheꢀmixerꢀisꢀapproxi-
metricalꢀandꢀtheꢀinputꢀresistorsꢀshouldꢀbeꢀwellꢀmatchedꢀ matelyꢀ10Ω,ꢀasꢀindicatedꢀinꢀTableꢀ1.ꢀTheꢀpackageꢀandꢀ
(0.1%ꢀtoleranceꢀisꢀrecommended).ꢀ
externalꢀinductancesꢀ(TL1ꢀandꢀTL2)ꢀareꢀusedꢀalongꢀwithꢀ
R1
L1
LT5579
IF
50mA
C1
C2
INPUT T1
TL1
+
IF
4:1
3
4
570mV
2k
2k
V
CC
C9
TL2
C3
–
IF
570mV
50mA
L2
5579 F02
R2
Figure 2. IF Input with External Matching
5579fa
ꢀꢁ
LT5579
applicaTions inForMaTion
C9ꢀtoꢀstepꢀtheꢀimpedanceꢀupꢀtoꢀaboutꢀ12.5Ω.ꢀAtꢀlowerꢀ Theꢀ purposeꢀ ofꢀ capacitorꢀ C3ꢀ isꢀ toꢀ improveꢀ theꢀ LO-RFꢀ
frequenciesꢀadditionalꢀseriesꢀinductanceꢀmayꢀbeꢀrequiredꢀ leakageꢀinꢀsomeꢀapplications.ꢀThisꢀrelativelyꢀsmall-valuedꢀ
betweenꢀtheꢀIFꢀportsꢀandꢀC9.ꢀTheꢀpositionꢀofꢀC9ꢀmayꢀvaryꢀ capacitorꢀhasꢀlittleꢀeffectꢀonꢀtheꢀimpedanceꢀmatchꢀinꢀmostꢀ
withꢀtheꢀIFꢀfrequencyꢀdueꢀtoꢀtheꢀdifferentꢀseriesꢀinductanceꢀ cases.ꢀThisꢀcapacitorꢀshouldꢀtypicallyꢀbeꢀlocatedꢀcloseꢀtoꢀ
requirements.ꢀTheꢀ4:1ꢀimpedanceꢀratioꢀofꢀtransformerꢀT1ꢀ theꢀIC,ꢀhowever,ꢀthereꢀmayꢀbeꢀcasesꢀwhereꢀre-positioningꢀ
completesꢀtheꢀtransformationꢀtoꢀ50ꢀohms.ꢀTableꢀ1ꢀlistsꢀtheꢀ theꢀcapacitorꢀmayꢀimproveꢀperformance.
differentialꢀIFꢀinputꢀimpedancesꢀandꢀreflectionꢀcoefficientsꢀ
forꢀseveralꢀfrequencies.
Theꢀ measuredꢀ returnꢀ lossꢀ ofꢀ theꢀ IFꢀ inputꢀ isꢀ shownꢀ inꢀ
Figureꢀ3ꢀforꢀapplicationꢀfrequenciesꢀofꢀ70MHz,ꢀ240MHzꢀ
andꢀ456MHz.ꢀComponentꢀvaluesꢀareꢀlistedꢀinꢀTableꢀ2.ꢀ(Forꢀ
70MHzꢀmatchingꢀdetails,ꢀreferꢀtoꢀFigureꢀ8.)
Table 1. IF Input Differential Impedance
REFLECTION COEFFICIENT
FREQUENCY
(MHz)
IF INPUT
IMPEDANCE
MAG
0.70
0.70
0.70
0.70
0.70
0.68
0.67
0.65
0.64
ANGLE
177
175
174
173
170
168
167
158
148
Table 2. IF Input Component Values
70
140
170
190
240
380
450
750
1000
8.8+j1.3
8.7+j2.3
9.0+j2.8
8.9+j3.0
9.0+j4.0
9.7+j4.9
10.0+j5.2
10.8+j9.4
11.8+j13.8
FREQUENCY C1, C2
C9
C3
L1, L2 R1, R2 MATCH BW
(MHz)
70(3)
140
(pF)
1000
180
82
(pF)
(pF)
(nH)
100
100
40
(Ω) (at 12dB RL)
120
22
(1)
(1)
(1)
(1)
9.1
9.1
11
<50ꢀtoꢀ158
112ꢀtoꢀ170
174ꢀtoꢀ263
330ꢀtoꢀ505
240
33
450
33
33
40
11
Note:ꢀ(1)ꢀDependsꢀonꢀRF,ꢀ(2)ꢀT1ꢀ=ꢀM/A-ComꢀMABAES0061,ꢀꢀ
(3)ꢀSeeꢀFigureꢀ8
0
–5
–10
–15
–20
–25
c
b
a
400
0
100 200 300
500 600 700 800
FREQUENCY (MHz)
5579 F03
Figure 3. IF Input Return Loss with 70MHz (a),
240MHz (b) and 456MHz (c) Matching
5579fa
ꢀꢂ
1000
1500
1900
2000
2150
2400
3050
3150
4000
79.1||–
74.7||–
66.8||–
53.8||–
33.7||–
33.0||–
43.9||+
j113
j96.3
j81.5
j69.8
j115
j146
j173
–65.2
–74.7
–87.0
–105
–148
–154
123
750
63.3||–
20.3||–
78.4||–
j30.5
j1120
j1250
LT5579
applicaTions inForMaTion
LO Input Interface
WhileꢀexternalꢀmatchingꢀofꢀtheꢀLOꢀinputꢀisꢀnotꢀrequiredꢀ
forꢀfrequenciesꢀaboveꢀ1.1GHz,ꢀexternalꢀmatchingꢀshouldꢀ
beꢀusedꢀforꢀlowerꢀLOꢀfrequenciesꢀforꢀbestꢀperformance.ꢀ
Tableꢀ3ꢀlistsꢀtheꢀinputꢀimpedanceꢀandꢀreflectionꢀcoefficientꢀ
vsꢀfrequencyꢀforꢀtheꢀLOꢀinputꢀforꢀuseꢀinꢀsuchꢀcases.
Theꢀsimplifiedꢀschematicꢀforꢀtheꢀsingle-endedꢀLOꢀinputꢀportꢀ
isꢀshownꢀinꢀFigureꢀ4.ꢀAnꢀinternalꢀtransformerꢀprovidesꢀaꢀ
broadbandꢀimpedanceꢀmatchꢀandꢀperformsꢀsingle-endedꢀ
toꢀdifferentialꢀconversion.ꢀAnꢀinternalꢀcapacitorꢀalsoꢀaidsꢀ
inꢀimpedanceꢀmatchingꢀandꢀprovidesꢀDCꢀisolationꢀtoꢀtheꢀ
primaryꢀtransformerꢀwinding.ꢀTheꢀtransformerꢀsecondaryꢀ
feedsꢀtheꢀdifferentialꢀlimitingꢀamplifierꢀstagesꢀthatꢀdriveꢀ
theꢀmixerꢀcore.
Table 3. Single-Ended LO Input Impedance
(at Pin 22, No External Match)
REFLECTION COEFFICIENT
FREQUENCY
(MHz)
INPUT
IMPEDANCE
MAG
0.68
0.42
0.22
0.34
0.35
0.36
0.35
0.26
0.24
0.15
ANGLE
–125
–179
–7.7
TheꢀmeasuredꢀreturnꢀlossꢀofꢀtheꢀLOꢀinputꢀportꢀisꢀshownꢀ
inꢀFigureꢀ5ꢀforꢀanꢀLOꢀinputꢀpowerꢀofꢀ–1dBm.ꢀTheꢀimped-
anceꢀmatchꢀisꢀacceptableꢀfromꢀaboutꢀ1.1GHzꢀtoꢀbeyondꢀ
4GHz,ꢀwithꢀaꢀminimumꢀreturnꢀlossꢀacrossꢀthisꢀrangeꢀofꢀ
aboutꢀ9dBꢀatꢀ2300MHz.ꢀIfꢀdesired,ꢀtheꢀreturnꢀlossꢀcanꢀ
beꢀimprovedꢀbelowꢀ1.1GHzꢀbyꢀexternalꢀcomponentsꢀasꢀ
shownꢀinꢀFigureꢀ4.ꢀTheꢀreturnꢀlossꢀcanꢀalsoꢀbeꢀimprovedꢀ
byꢀreducingꢀtheꢀLOꢀdriveꢀlevel,ꢀthoughꢀperformanceꢀwillꢀ
degradeꢀifꢀtheꢀlevelꢀisꢀtooꢀlow.
EXTERNAL
MATCHING
FOR LOW
FREQUENCY
ONLY
0
V
CC
LO
INPUT
–5
–10
–15
–20
–25
L6
LO
22
C13
V
BIAS
5579 F04
Figure 4. LO Input Circuit
500 1000 1500 2000 2500 3000 3500 4000
FREQUENCY (MHz)
5579 F05
Figure 5. LO Input Return Loss
5579fa
ꢀꢃ
LT5579
applicaTions inForMaTion
RF Output Interface
Table 4. Single-Ended RF Output Impedance
(at Pin 15, No External Matching)
TheꢀRFꢀoutputꢀinterfaceꢀisꢀshownꢀinꢀFigureꢀ6.ꢀAnꢀinternalꢀ
RFꢀtransformerꢀreducesꢀtheꢀmixerꢀcoreꢀoutputꢀimpedanceꢀ
toꢀsimplifyꢀmatchingꢀofꢀtheꢀRFꢀoutputꢀpin.ꢀAꢀcenterꢀtapꢀinꢀ
theꢀtransformerꢀprovidesꢀtheꢀDCꢀconnectionꢀtoꢀtheꢀmixerꢀ
coreꢀandꢀtheꢀtransformerꢀprovidesꢀDCꢀisolationꢀtoꢀtheꢀRFꢀ
output.ꢀTheꢀRFꢀpinꢀisꢀinternallyꢀgroundedꢀthroughꢀtheꢀ
secondaryꢀwindingꢀofꢀtheꢀtransformer,ꢀthusꢀaꢀDCꢀvoltageꢀ
shouldꢀnotꢀbeꢀappliedꢀtoꢀthisꢀpin.
REFLECTION COEFFICIENT
FREQUENCY
(MHz)
RF OUTPUT
IMPEDANCE
MAG
0.78
0.62
0.52
0.42
0.34
0.30
0.45
ANGLE
97.4
1250
1750
1950
2150
2300
2600
3600
11.0+j42.7
55.6+j83.4
119+j62.4
116–j21.0
73.7–j37.7
35.2–j21.5
21.9+j17.8
47.8
21.9
–10.4
–40.9
–110
134
Whileꢀ theꢀ LT5579ꢀ performsꢀ bestꢀ atꢀ frequenciesꢀ aboveꢀ
1500MHz,ꢀtheꢀpartꢀcanꢀbeꢀusedꢀdownꢀtoꢀ900MHz.ꢀTheꢀ
internalꢀRFꢀtransformerꢀisꢀnotꢀoptimizedꢀforꢀtheseꢀlowerꢀ
frequencies,ꢀthusꢀtheꢀgainꢀandꢀimpedanceꢀmatchingꢀband-
widthꢀwillꢀdecreaseꢀdueꢀtoꢀtheꢀlowꢀtransformerꢀinductance.ꢀ
TheꢀimpedanceꢀdataꢀforꢀtheꢀRFꢀoutput,ꢀlistedꢀinꢀTableꢀ4,ꢀ
canꢀbeꢀusedꢀtoꢀdevelopꢀmatchingꢀnetworksꢀforꢀdifferentꢀ
frequenciesꢀorꢀloadꢀimpedances.ꢀFigureꢀ7ꢀillustratesꢀtheꢀ
outputꢀreturnꢀlossꢀperformanceꢀforꢀseveralꢀapplications.ꢀ
Theꢀcomponentꢀvaluesꢀandꢀapproximateꢀmatchingꢀband-
widthsꢀareꢀlistedꢀinꢀTableꢀ5.
Table 5. RF Output Component Values
FREQUENCY
(MHz)
1650
1750
1950
2140
2600
3600
C8 (pF)
1.5
1.2
1
L3 (nH)
MATCH BW (at 12dB RL)
1630ꢀtoꢀ1770
6.8
6.8
1725ꢀtoꢀ1870
4.7
1840ꢀtoꢀ2020
0.45
–
3.9
2035ꢀtoꢀ2285
1
2260ꢀtoꢀ2780*
3170ꢀtoꢀ4100*
0.7
0Ω
*10dBꢀReturnꢀLossꢀbandwidth
DC and RF Grounding
0
TheꢀLT5579ꢀreliesꢀonꢀtheꢀbackꢀsideꢀgroundꢀforꢀbothꢀRFꢀandꢀ
thermalꢀperformance.ꢀTheꢀExposedꢀPadꢀmustꢀbeꢀsolderedꢀ
toꢀtheꢀlowꢀimpedanceꢀtopsideꢀgroundꢀplaneꢀofꢀtheꢀboard.ꢀ
Severalꢀviasꢀshouldꢀconnectꢀtheꢀtopsideꢀgroundꢀtoꢀotherꢀ
groundꢀlayersꢀtoꢀaidꢀinꢀthermalꢀdissipation.
–5
–10
–15
–20
c
LT5579
d
RF
50Ω
a
b
L3
–25
1500
15
2000
2500
3000
3500
4000
C8
FREQUENCY (MHz)
5579 F07
Figure 7. RF Output Return Loss with 1750MHz (a),
2140MHz (b), 2600MHz (c) and 3600MHz (d) Matching
5579 F06
8
9
10
11
V
CC
Figure 6. RF Output Circuit
5579fa
ꢀꢄ
LT5579
Typical applicaTions
wasꢀpurposefullyꢀshiftedꢀhighꢀinꢀorderꢀtoꢀachieveꢀbetterꢀ
OIP3ꢀperformanceꢀatꢀtheꢀdesiredꢀfrequency.
Theꢀ followingꢀ examplesꢀ illustrateꢀ theꢀ implementationꢀ
andꢀ performanceꢀ ofꢀ theꢀ LT5579ꢀ inꢀ differentꢀ frequencyꢀ
configurations.ꢀTheseꢀcircuitsꢀwereꢀevaluatedꢀusingꢀtheꢀ
circuitꢀboardꢀshownꢀinꢀFigureꢀ12.
Figureꢀ9ꢀshowsꢀtheꢀmeasuredꢀconversionꢀgainꢀandꢀOIP3ꢀ
asꢀaꢀfunctionꢀofꢀRFꢀoutputꢀfrequency.ꢀAsꢀmentionedꢀabove,ꢀ
theꢀoutputꢀimpedanceꢀmatchꢀisꢀshiftedꢀtowardsꢀtheꢀhighꢀ
sideꢀofꢀtheꢀband,ꢀandꢀthisꢀisꢀevidencedꢀbyꢀtheꢀpositiveꢀslopeꢀ
ofꢀtheꢀgain.ꢀTheꢀsingleꢀsidebandꢀnoiseꢀfigureꢀacrossꢀtheꢀ
frequencyꢀrangeꢀisꢀalsoꢀshown.ꢀ
1650MHz Application
Inꢀthisꢀcase,ꢀtheꢀLT5579ꢀwasꢀevaluatedꢀwhileꢀtunedꢀforꢀanꢀ
IFꢀofꢀ70MHzꢀandꢀanꢀRFꢀoutputꢀofꢀ1650MHz.ꢀTheꢀmatchingꢀ
configurationꢀisꢀshownꢀinꢀFigureꢀ8.ꢀ
Curvesꢀ forꢀ bothꢀ highꢀ sideꢀ andꢀ lowꢀ sideꢀ LOꢀ casesꢀ areꢀ
shown.ꢀInꢀthisꢀparticularꢀapplication,ꢀtheꢀlowꢀsideꢀOIP3ꢀ
outperformsꢀtheꢀhighꢀsideꢀcase.
InputꢀcapacitorsꢀareꢀusedꢀonlyꢀasꢀDCꢀblocksꢀinꢀthisꢀap-
plication.ꢀTheꢀ4.7nHꢀinductorsꢀandꢀtheꢀ120pFꢀcapacitorꢀ
transformꢀtheꢀinputꢀimpedanceꢀofꢀtheꢀICꢀupꢀtoꢀapproximatelyꢀ
35
OIP3
30
25
9.1Ω
T
f
= 25°C
A
= 70MHz
100nH
IF
20
15
10
5
47pF
LO
P
= –5dBm/TONE
= –1dBm
LOW SIDE LO
HIGH SIDE LO
IF
P
LO
MABAES0061
4:1
SSB NF
1nF
1nF
4.7nH
120pF
4.7nH
RF
1650MHz
6.8nH
1.5pF
IF
70MHz
GAIN
0
47pF
–5
5579 F08
1650
RF OUTPUT FREQUENCY (MHz)
1550
1600
1700
1750
100nH
5579 F09
9.1Ω
Figure 9. Gain, Noise Figure and OIP3 vs
RF Frequency with 70MHz IF and 1650MHz RF
Figure 8. IF Input Tuned for 70MHz
1950MHz Application
12.5Ω.ꢀTheꢀrelativelyꢀlowꢀinputꢀfrequencyꢀdemandedꢀtheꢀ
useꢀofꢀ4.7nHꢀchipꢀinductorsꢀinsteadꢀofꢀshortꢀtransmissionꢀ
lines.ꢀ
Inꢀthisꢀexample,ꢀaꢀhighꢀsideꢀLOꢀwasꢀusedꢀtoꢀconvertꢀtheꢀIFꢀ
inputꢀsignalꢀatꢀ240MHzꢀtoꢀ1950MHzꢀatꢀtheꢀRFꢀoutput.ꢀTheꢀ
RFꢀportꢀimpedanceꢀmatchꢀwasꢀrealizedꢀwithꢀC8ꢀ=ꢀ1pFꢀandꢀ
L3ꢀ=ꢀ4.7nH.ꢀAsꢀinꢀtheꢀ1650MHzꢀcase,ꢀitꢀwasꢀfoundꢀthatꢀ
tuningꢀtheꢀoutputꢀmatchꢀslightlyꢀhighꢀinꢀfrequencyꢀgaveꢀ
betterꢀOIP3ꢀresultsꢀatꢀtheꢀdesiredꢀfrequency.ꢀTheꢀinputꢀ
matchꢀforꢀ240MHzꢀoperationꢀisꢀtheꢀsameꢀasꢀdescribedꢀinꢀ
theꢀtestꢀcircuitꢀofꢀFigureꢀ1.
CloserꢀtoꢀtheꢀICꢀinput,ꢀ47pFꢀcapacitorsꢀwereꢀusedꢀinsteadꢀ
ofꢀaꢀsingleꢀdifferentialꢀcapacitorꢀ(C3ꢀinꢀFigureꢀ1),ꢀbecauseꢀitꢀ
wasꢀfoundꢀthatꢀtheꢀadditionꢀofꢀcommonꢀmodeꢀcapacitanceꢀ
improvedꢀtheꢀhighꢀsideꢀLOꢀperformanceꢀinꢀthisꢀapplica-
tion.ꢀTheꢀvalueꢀofꢀtheseꢀ47pFꢀcapacitorsꢀwasꢀselectedꢀtoꢀ
resonateꢀwithꢀtheꢀ100nHꢀinductorsꢀatꢀ70MHz.ꢀNoteꢀthatꢀ
addingꢀ commonꢀ modeꢀ capacitanceꢀ doesꢀ notꢀ improveꢀ
performanceꢀwithꢀallꢀfrequencyꢀconfigurations.
Theꢀmeasuredꢀ1950MHzꢀperformanceꢀisꢀplottedꢀinꢀFig-
ureꢀ10ꢀforꢀbothꢀlowꢀsideꢀandꢀhighꢀsideꢀLOꢀdrive.ꢀWithꢀthisꢀ
matchingꢀconfiguration,ꢀtheꢀlowꢀsideꢀLOꢀcaseꢀoutperformsꢀ
theꢀhighꢀsideꢀLO.ꢀTheꢀgain,ꢀnoiseꢀfigureꢀ(SSB)ꢀandꢀOIP3ꢀ
areꢀplottedꢀasꢀaꢀfunctionꢀofꢀRFꢀoutputꢀfrequency.
TheꢀRFꢀportꢀimpedanceꢀmatchꢀwasꢀrealizedꢀwithꢀC8ꢀ=ꢀ
1.5pFꢀandꢀL3ꢀ=ꢀ6.8nH.ꢀTheꢀoptimumꢀimpedanceꢀmatchꢀ
5579fa
ꢀꢅ
LT5579
Typical applicaTions
35
benefitedꢀfromꢀtheꢀadditionꢀofꢀcommonꢀmodeꢀcapacitanceꢀ
toꢀtheꢀIFꢀinputꢀmatch.ꢀAꢀ10pFꢀcapacitorꢀtoꢀgroundꢀwasꢀ
addedꢀ toꢀ eachꢀ IFꢀ pin.ꢀ Theseꢀ capacitorsꢀ wereꢀ attachedꢀ
nearꢀinductorsꢀL1ꢀandꢀL2.ꢀTheꢀmeasuredꢀperformanceꢀisꢀ
shownꢀinꢀFigureꢀ11.
OIP3
30
25
T
= 25°C
A
f
= 240MHz
= –5dBm/TONE
IF
P
P
LOW SIDE LO
HIGH SIDE LO
20
15
10
5
IF
= –1dBm
LO
30
SSB NF
GAIN
OIP3
25
T
= 25°C
= 240MHz
= –5dBm/TONE
A
f
20
15
10
5
IF
P
P
IF
0
1800
= –1dBm
LO
1850
1900
1950
2050
2000
f
= f + f
RF IF LO
RF OUTPUT FREQUENCY (MHz)
SSB NF
5579 F10
Figure 10. Gain, Noise Figure and OIP3 vs
RF Frequency for the 1950MHz Application
GAIN
0
2000
2100 2150 2200 2250 2300
2050
2140MHz with Low Side LO
RF OUTPUT FREQUENCY (MHz)
5579 F11
TheꢀLT5579ꢀwasꢀfullyꢀcharacterizedꢀwithꢀanꢀRFꢀoutputꢀofꢀ
2140MHzꢀandꢀaꢀhighꢀsideꢀLO.ꢀTheꢀpartꢀalsoꢀworksꢀwellꢀ
whenꢀdrivenꢀwithꢀlowꢀsideꢀLO,ꢀhowever,ꢀtheꢀperformanceꢀ
Figure 11. Measured Performance when Tuned
for 240MHz IF, 2140MHz RF and Low Side LO
Figure 12. LT5579 Evaluation Board (DC1233A)
5579fa
ꢀꢆ
LT5579
package DescripTion
UH Package
24-Lead Plastic QFN (5mm × 5mm)
(ReferenceꢀLTCꢀDWGꢀ#ꢀ05-08-1747ꢀRevꢀA)
0.75 p0.05
5.40 p0.05
3.90 p0.05
3.20 p 0.05
3.25 REF
3.20 p 0.05
PACKAGE OUTLINE
0.30 p 0.05
0.65 BSC
PIN 1 NOTCH
R = 0.30 TYP
OR 0.35 s 45o
CHAMFER
RECOMMENDED SOLDER PAD LAYOUT
APPLY SOLDER MASK TO AREAS THAT ARE NOT SOLDERED
BOTTOM VIEW—EXPOSED PAD
R = 0.150
R = 0.05
TYP
0.75 p 0.05
5.00 p 0.10
TYP
23 24
0.00 – 0.05
0.55 p 0.10
PIN 1
TOP MARK
(NOTE 6)
1
2
3.20 p 0.10
5.00 p 0.10
3.25 REF
3.20 p 0.10
(UH24) QFN 0708 REV A
0.200 REF
0.30 p 0.05
0.65 BSC
NOTE:
1. DRAWING IS NOT A JEDEC PACKAGE OUTLINE
2. DRAWING NOT TO SCALE
3. ALL DIMENSIONS ARE IN MILLIMETERS
4. DIMENSIONS OF EXPOSED PAD ON BOTTOM OF PACKAGE DO NOT INCLUDE
MOLD FLASH. MOLD FLASH, IF PRESENT, SHALL NOT EXCEED 0.20mm ON ANY SIDE
5. EXPOSED PAD SHALL BE SOLDER PLATED
6. SHADED AREA IS ONLY A REFERENCE FOR PIN 1 LOCATION
ON THE TOP AND BOTTOM OF PACKAGE
5579fa
ꢀꢇ
LT5579
revision hisTory
REV
DATE
DESCRIPTION
PAGE NUMBER
A
6/10
RevisedꢀTypicalꢀApplicationꢀdrawing.
1
RevisedꢀAbsoluteꢀMaximumꢀRatings,ꢀPinꢀConfigurationꢀandꢀDCꢀElectricalꢀCharacteristicsꢀsections.
RevisedꢀACꢀElectricalꢀCharacteristicsꢀsectionꢀparametersꢀandꢀNoteꢀ3.
RevisedꢀFigureꢀ1ꢀtable.
2
3
11
UpdateꢀTablesꢀ2,ꢀ3ꢀandꢀ5ꢀinꢀApplicationsꢀInformationꢀsection
AddedꢀTypicalꢀApplicationꢀdrawingꢀandꢀgraph,ꢀandꢀrevisedꢀRelatedꢀPartsꢀlist
13,ꢀ14,ꢀ15
20
5579fa
InformationꢀfurnishedꢀbyꢀLinearꢀTechnologyꢀCorporationꢀisꢀbelievedꢀtoꢀbeꢀaccurateꢀandꢀreliable.ꢀ
However,ꢀnoꢀresponsibilityꢀisꢀassumedꢀforꢀitsꢀuse.ꢀLinearꢀTechnologyꢀCorporationꢀmakesꢀnoꢀrepresenta-
tionꢀthatꢀtheꢀinterconnectionꢀofꢀitsꢀcircuitsꢀasꢀdescribedꢀhereinꢀwillꢀnotꢀinfringeꢀonꢀexistingꢀpatentꢀrights.
ꢀꢈ
LT5579
Typical applicaTion
2650MHz LTE Downlink Transmitter
LO INPUT
–1dBm (TYP)
Gain and OIP3 vs
RF Output Frequency
10
9
8
7
6
5
4
3
2
1
0
28
27
26
25
24
23
22
21
20
19
18
LO
LT5579
OIP3
GND
RF
T
= 25°C
A
CC
LOW-SIDE LO
HIGH-SIDE LO
V
= 3.3V
BIAS
11Ω
f
IF
= 380MHz
IF
RF
OUTPUT
2650MHz
INPUT
40nH
MABAES0061
4:1
33pF
33pF
380MHz
1nH
+
IF
GAIN
33pF
2.7pF
–
IF
2500 2550 2600 2650 2700 2750 2800
RF FREQUENCY (MHz)
5579 TA02b
40nH
11Ω
V
CC
5579 TA02a
V
CC
3.3V
1µF
100pF
1nF
relaTeD parTs
PART NUMBER DESCRIPTION
Infrastructure
COMMENTS
LT5527
400MHzꢀtoꢀ3.7GHz,ꢀ5VꢀDownconvertingꢀMixer
2.3dBꢀGain,ꢀ23.5dBmꢀIIP3ꢀandꢀ12.5dBꢀNFꢀatꢀ1900MHz,ꢀ5V/78mAꢀSupply
LT5557
400MHzꢀtoꢀ3.8GHz,ꢀ3.3VꢀDownconvertingꢀMixer 2.9dBꢀGain,ꢀ24.7dBmꢀIIP3ꢀandꢀ11.7dBꢀNFꢀatꢀ1950MHz,ꢀ3.3V/82mAꢀSupply
LTC6400-X
LTC6401-X
LTC6416
LTC6412
LT5554
300MHzꢀLowꢀDistortionꢀIFꢀAmp/ADCꢀDriver
140MHzꢀLowꢀDistortionꢀIFꢀAmp/ADCꢀDriver
2GHzꢀ16-BitꢀADCꢀBuffer
FixedꢀGainꢀofꢀ8dB,ꢀ14dB,ꢀ20dBꢀandꢀ26dB;ꢀ>36dBmꢀOIP3ꢀatꢀ300MHz,ꢀDifferentialꢀI/O
FixedꢀGainꢀofꢀ8dB,ꢀ14dB,ꢀ20dBꢀandꢀ26dB;ꢀ>40dBmꢀOIP3ꢀatꢀ140MHz,ꢀDifferentialꢀI/O
40.25dBmꢀOIP3ꢀtoꢀ300MHz,ꢀProgrammableꢀFastꢀRecoveryꢀOutputꢀClamping
35dBmꢀOIP3ꢀatꢀ240MHz,ꢀContinuousꢀGainꢀRangeꢀ–14dBꢀtoꢀ17dB
31dBꢀLinearꢀAnalogꢀVGA
UltralowꢀDistortꢀIFꢀDigitalꢀVGA
48dBmꢀOIP3ꢀatꢀ200MHz,ꢀ2dBꢀtoꢀ18dBꢀGainꢀRange,ꢀ0.125dBꢀGainꢀSteps
LT5575
700MHzꢀtoꢀ2.7GHzꢀDirectꢀConversionꢀI/Qꢀ
Demodulator
IntegratedꢀBaluns,ꢀ28dBmꢀIIP3,ꢀ13dBmꢀP1dB,ꢀ0.03dBꢀI/QꢀAmplitudeꢀMatch,ꢀꢀ
0.4°ꢀPhaseꢀMatch
LT5578
400MHzꢀtoꢀ2.7GHzꢀUpconvertingꢀMixer
5MHzꢀtoꢀ1.6GHzꢀI/QꢀModulator
27dBmꢀOIP3ꢀatꢀ900MHz,ꢀ24.2dBmꢀatꢀ1.95GHz,ꢀIntegratedꢀRFꢀTransformer
27.7dBmꢀOIP3ꢀatꢀ140MHz,ꢀ22.9dBmꢀatꢀ900MHz,ꢀ–161.2dBm/HzꢀNoiseꢀFloor
LTC5598
RF Power Detectors
LT5534
50MHzꢀtoꢀ3GHzꢀLogꢀRFꢀPowerꢀDetectorꢀwithꢀ
60dBꢀDynamicꢀRange
1dBꢀOutputꢀVariationꢀoverꢀTemperature,ꢀ38nsꢀResponseꢀTime,ꢀLogꢀLinearꢀ
Response
LT5537
WideꢀDynamicꢀRangeꢀLogꢀRF/IFꢀDetector
2.7GHzꢀMean-SquaredꢀDetector
6GHzꢀLowꢀPowerꢀRMSꢀDetector
LowꢀFrequencyꢀtoꢀ1GHz,ꢀ83dBꢀLogꢀLinearꢀDynamicꢀRange
LT5570
0.5dBꢀAccuracyꢀOverꢀTemperatureꢀandꢀ>50dBꢀDynamicꢀRange,ꢀ500nsꢀRiseꢀTime
40dBꢀDynamicꢀRange,ꢀ 1dBꢀAccuracyꢀOverꢀTemperature,ꢀ1.5mAꢀSupplyꢀCurrent
LT5581
ADCs
LTC2208
LTC2262-14
LTC2242-12
16-Bit,ꢀ130MspsꢀADC
78dBFSꢀNoiseꢀFloor,ꢀ>83dBꢀSFDRꢀatꢀ250MHz
14-Bit,ꢀ150MspsꢀADCꢀUltralowꢀPower
12-Bit,ꢀ250MspsꢀADC
72.8dBꢀSNR,ꢀ88dBꢀSFDR,ꢀ149mWꢀPowerꢀConsumption
65.4dBꢀSNR,ꢀ78dBꢀSFDR,ꢀ740mWꢀPowerꢀConsumption
5579fa
LT 0610 REV A • PRINTED IN USA
Linear Technology Corporation
1630ꢀ McCarthyꢀ Blvd.,ꢀ Milpitas,ꢀ CAꢀ 95035-7417
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LINEAR TECHNOLOGY CORPORATION 2008
(408)ꢀ432-1900ꢀ ꢀFAX:ꢀ(408)ꢀ434-0507ꢀ www.linear.com
相关型号:
LT5581IDDB#PBF
LT5581 - 6GHz RMS Power Detector with 40dB Dynamic Range; Package: DFN; Pins: 8; Temperature Range: -40°C to 85°C
Linear
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