LT5579IUH#PBF_技术文档

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

ꢀ 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

IF

BIAS

11Ω

LO RF IF

IF

RF

OUTPUT

2140MHz

SSB NF

GAIN

INPUT

40nH

MABAES0061

4:1

10

5

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

1

2

3

4

5

6

RFꢀOutputꢀDCꢀCurrentꢀ........................................... 60mA

GND

17

16

+

IF

+

–

IF ,ꢀIF ꢀDCꢀCurrentsꢀ.............................................. 60mA

ꢀ.................................................................... 150°C

25

–

IF

15 RF

T

JMAX

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/

V_CC= 3.3V, T_A= 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

5579fa

ꢁ

LT5579

V_CC= 3.3V, T_A= 25°C, P_IF= –5dBm (–5dBm/tone for 2-tone tests,

ac elecTrical characTerisTics

∆f = 1MHz), P_LO= –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

V_CC= 3.3V, T_A= 25°C, P_IF= –5dBm (–5dBm/tone for 2-tone tests, ∆f = 1MHz), P_LO= –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

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

–0.027ꢀ

–0.027

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

dBm

dBmꢀ

dBm

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/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

dBm

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

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:

V_CC= 3.3V, T_A= 25°C, f_IF= 456MHz, P_IF= –5dBm (–5dBm/tone for 2-tone tests, ∆f = 1MHz), low side LO, P_LO= –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

= 90°C

= 25°C

= –45°C

T

= 90°C

= 25°C

= –45°C

T

= 90°C

= 25°C

= –45°C

A

14

12

20

15

20

15

10

8

10

5

6

10

5

4

2

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:

V_CC= 3.3V, T_A= 25°C, f_IF= 456MHz, P_IF= –5dBm (–5dBm/tone for 2-tone tests, ∆f = 1MHz), low side LO, P_LO= –1dBm,

Conversion Gain and OIP3

vs RF Output Frequency

SSB Noise Figure

LO-RF Leakage

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)

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

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

18

16

14

12

10

8

–20

–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

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)

SUPPLY VOLTAGE (V)

5579 G11

5579 G12

5579 G13

5579fa

ꢄ

LT5579

Typical ac perForMance characTerisTics ^{2300MHz to 2700MHz Application:}

V_CC= 3.3V, T_A= 25°C, f_IF= 456MHz, P_IF= –5dBm (–5dBm/tone for 2-tone tests, ∆f = 1MHz), high side LO, P_LO= –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

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

25°C

–40°C

25°C

20

16

12

8

–40°C

GAIN

4

6

0

85°C

25°C

–40°C

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

–40

10

8

–60

–80

–60

–80

6

4

2

85°C

25°C

–40°C

85°C

25°C

–40°C

25°C

–40°C

–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)

SUPPLY VOLTAGE (V)

5579 G22

5579 G20

5579 G21

5579fa

ꢅ

LT5579

Typical perForMance characTerisTics ^{2140MHz Application:}

V_CC= 3.3V, T_A= 25°C, f_IF= 240MHz, P_IF= –5dBm (–5dBm/tone for 2-tone tests, ∆f = 1MHz), high side LO, P_LO= –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)

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

6

0

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

–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

–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:}

V_CC= 3.3V, T_A= 25°C, f_IF= 240MHz, P_IF= –5dBm (–5dBm/tone for 2-tone tests, ∆f = 1MHz), low side LO, P_LO= –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)

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

GAIN

85°C

25°C

–40°C

10

8

GAIN

4

6

4

2

0

85°C

25°C

–40°C

85°C

25°C

–40°C

–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)

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

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

25°C

–40°C

–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

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

C1

C2

TL1

TL2

GND

RF

OUTPUT

+

IF

INPUT

IF

L3

TL3

C9

C3

GND

–

IF

C8

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

SIZE

COMMENTS

AVX

82pF

—

82pF

—

33pF

2.7pF

100pF

10pF

1nF

33pF

1.8pF

100pF

10pF

1nF

0402

0603

0402

0603

0402

0603

SM-22

—

AVX

C4

100pF

10pF

1nF

100pF

10pF

1nF

AVXꢀ

C5

AVX

C6

AVX

C7

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

—

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

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

0.68

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)

(nH)

100

40

(Ω) (at 12dB RL)

120

22

(1)

9.1

11

<50ꢀtoꢀ158

112ꢀtoꢀ170

174ꢀtoꢀ263

330ꢀtoꢀ505

240

33

450

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

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

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

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

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

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


型号：	LT5579IUH#PBF
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

LT5579IUH#PBF [Linear]

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