LINEAR TECHNOLOGY LT5520 Technical data

查询LT5520EUF供应商

FEATURES

■

Wide RF Output Frequency Range: 1.3GHz
to 2.3GHz

■

15.9dBm Typical Input IP3 at 1.9GHz

■

On-Chip RF Output Transformer

■

No External LO or RF Matching Required

■

Single-Ended LO and RF Operation

■

Integrated LO Buffer: –5dBm Drive Level

■

Low LO to RF Leakage: – 41dBm Typical

■

Wide IF Frequency Range: DC to 400MHz

■

Enable Function with Low Off-State Leakage Current

■

Single 5V Supply

■

Small 16-Lead QFN Plastic Package

U

APPLICATIO S

■

Wireless Infrastructure

■

Cable Downlink Infrastructure

■

Point-to-Point Data Communications

■

High Linearity Frequency Conversion

LT5520

1.3GHz to 2.3GHz
High Linearity

Upconverting Mixer

U

DESCRIPTIO

The LT®5520 mixer is designed to meet the high linearity
requirements of wireless and cable infrastructure trans­mission applications. A high-speed, internally matched,
LO amplifier drives a double-balanced mixer core, allow­ing 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

5V

DC

1µF 1000pF

EN V

BIAS

+

IF

–

IF

Figure 1. Frequency Conversion in Wireless Infrastructure Transmitter

INPUT

BPF

IF

4:1

LO INPUT

–5dBm

220pF

220pF

100Ω

15pF

100Ω

(OPTIONAL)

U

CC1VCC2VCC3

85Ω

+

LO

RF Output Power and Output IM3 vs

39nH

10pF

+

RF

RF

BPF

PA

OUTPUT

–

RF

GND

5pF5pF

–

LT5520

LO

5520 F01

IF Input Power (Two Input Tones)

10

0
–10
–20
–30
–40
–50

, IM3 (dBm/TONE)

OUT

–60

P

–70
–80
–90

–16

P

OUT

PLO = –5dBm

IM3

–12

–8

IF INPUT POWER (dBm/TONE)

f
f
f
f
T

–4

= 1760MHz

LO

= 140MHz

IF1

= 141MHz

IF2

= 1900MHz

RF

= 25°C

A

0

4

5520 • F01b

5520f

1

LT5520

16 15 14 13

5 6 7 8

TOP VIEW

UF PACKAGE

16-LEAD (4mm × 4mm) PLASTIC QFN

EXPOSED PAD IS GND (PIN 17),

MUST BE SOLDERED TO PCB

9

10

11

12

4

3

2

1

EN

V

CC1VCC2VCC3

GND

IF

+

IF

–

GND

GND
RF

+

RF

–

GND

GND

LO–LO+GND

17

WW

W

ABSOLUTE AXI U RATI GS

U

UUW

PACKAGE/ORDER I FOR ATIO

(Note 1)

Supply Voltage ....................................................... 5.5V

Enable Voltage ............................. –0.3V to (V

+ 0.3V)

CC

LO Input Power (Differential).............................. 10dBm

ORDER PART

NUMBER

LT5520EUF

RF+ to RF– Differential DC Voltage...................... ±0.13V

RF Output DC Common Mode Voltage ......... –1V to V

CC

IF Input Power (Differential) ............................... 10dBm

IF+, IF– DC Currents.............................................. 25mA

LO+ to LO– Differential DC Voltage .......................... ±1V

LO Input DC Common Mode Voltage............ –1V to V

CC

UF PART

MARKING

5520

Operating Temperature Range .................–40°C to 85°C

T

= 125°C, θJA = 37°C/W

Storage Temperature Range ................. –65°C to 125°C

Junction Temperature (TJ)....................................125°C

Consult LTC Marketing for parts specified with wider operating temperature ranges.

JMAX

ELECTRICAL CHARACTERISTICS

PARAMETER CONDITIONS MIN TYP MAX UNITS

IF Input Frequency Range DC to 400 MHz
LO Input Frequency Range 900 to 2700 MHz
RF Output Frequency Range 1300 to 2300 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 ZO = 50Ω, with External Matching 20 dB
LO Input Return Loss ZO = 50Ω 16 dB
RF Output Return Loss ZO = 50Ω 20 dB
LO Input Power –10 to 0 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 Internally Biased 1.77 V
Noise Figure Single Side Band 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 V

2

DC

ENABLE

= 5V

DC

110 µA

5520f

LT5520

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 = High (On) 3V
Enable = Low (Off) 0.5 V

Power Supply Requirements (VCC)

Supply Voltage 4.5 to 5.25 V
Supply Current V

CC

= 5V

DC

60 70 mA

Shutdown Current EN = Low 1 100 µA

DC

DC

DC

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 f

= 1900MHz, f

RF

= 1.76GHz and f

LO

= 140MHz.

IF

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.

UW

TYPICAL PERFOR A CE CHARACTERISTICS

Supply Current
vs Supply Voltage

66

64

62

60

58

56

SUPPLY CURRENT (mA)

54

52

50

4.0 4.25

TA = 85°C

4.5 5.04.75

SUPPLY VOLTAGE (V)

TA = 25°C

TA = –40°C

5.25

5.5 4.0 4.25 4.5 5.04.75

5520 • GO1

1.0

0.9

0.8

0.7

0.6

0.5

0.4

0.3

SHUTDOWN CURRENT (µA)

0.2

0.1

(Test Circuit Shown in Figure 2)

Shutdown Current
vs Supply Voltage

TA = 85°C

TA = 25°C

TA = –40°C

0

SUPPLY VOLTAGE (V)

5.25

5.5

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

HIGH SIDE LO

16
14
12
10

8
6

GAIN, NF (dB)

4
2

0
–2
–4

1300 1300

LOW SIDE LO

SSB NF

GAIN

LOW SIDE AND HIGH SIDE LO

1500

RF OUTPUT FREQUENCY (MHz)

1700

1900

23002100

2500

5520 • GO3

IIP3 and IIP2
vs RF Output Frequency

32
30
28
26
24
22

IIP3 (dBm)

20

IIP3

18
16
14
12

LOW SIDE LO

HIGH SIDE LO

1700

1500 2300

RF OUTPUT FREQUENCY (MHz)

LOW SIDE LO

HIGH SIDE LO

2100

1900

IIP2

5520 • GO4

2500

55
50
45
40
35
30
25
20
15
10
5

IIP2 (dBm)

LO-RF Leakage
vs RF Output Frequency

–10

–20

–30

HIGH SIDE LO

–40

LO LEAKAGE (dBm)

–50

LOW SIDE LO

–60

1300 1500 2300

1700

RF OUTPUT FREQUENCY (MHz)

1900

2100

2500

5520 • GO5

5520f

3

LT5520

UW

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
14
12
10

GAIN (dB)

–2
–4

8
6
4
2
0

–16

TA = 85°C

TA = 25°C

GAIN

TA = –40°C

TA = 85°C

–12

LO INPUT POWER (dBm)

TA = 25°C

–8

IIP3 and IIP2 vs
LO Input Power

50
45
40

IIP2

35
30
25

IIP3

20

IIP3, IIP2 (dBm)

15
10

5
0

–16

LOW SIDE LO

HIGH SIDE LO

HIGH SIDE LO

LOW SIDE LO

–8

–12

LO INPUT POWER (dBm)

–4

SSB NF

TA = –40°C

5520 • G06

04

5520 • G09

IIP3 and IIP2 vs
LO Input Power

20
18
16
14

NF (dB)

12
10
8
6
4
2
0

40–4

50

TA = 25°C

45
40
35

IIP2

30
25

IIP3

20

IIP3, IIP2 (dBm)

15
10

5
0

–12

–16

TA = 85°C

TA = –40°C

TA = 25°C, TA = –40°C

TA = 85°C

–8

LO INPUT POWER (dBm)

–4

04

5520 • G07

RF Output Power and Output IM3 vs
IF Input Power (Two Input Tones)

10

0

TA = –40°C

–10
–20

P

OUT

–30
–40
–50

, IM3 (dBm/TONE)

P

OUT

–60
–70
–80
–90

TA = –40°C

IM3

–12

–16

IF INPUT POWER (dBm/TONE)

TA = 85°C

–8

TA = 25°C

TA = 85°C

–4

04

5520 • G10

LO-RF Leakage
vs LO Input Power

–10

–20

–30

TA = –40°C

–40

LO LEAKAGE (dBm)

TA = 25°C

–50

–60

–16

–8

–12

LO INPUT POWER (dBm)

–4

RF Output Power and Output IM2 vs
IF Input Power (Two Input Tones)

10

0

–10

–20

–30

–40

, IM2 (dBm/TONE)

–50

OUT

P

–60

–70

–80

TA = –40°C

P

OUT

IM2

TA = 85°C

–12

–16

IF INPUT POWER (dBm/TONE)

TA = 85°C

–8

TA = 25°C

TA = –40°C

–4

TA = 85°C

04

5520 • G08

TA = 25°C

04

5520 • G11

Conversion Gain vs IF Input
Power (One Input Tone)

4
3
2

TA = –40°C

1
0

–1

GAIN (dB)

–2
–3
–4
–5
–6

–16

TA = 25°C

–8

–12

IF INPUT POWER (dBm)

4

TA = 85°C

–4

04

5520 • G12

IF, LO and RF Port Return Loss
vs Frequency

0

–5

–10

–15

RETURN LOSS (dB)

–20

–25

0

LO PORT

IF PORT

500

RF PORT

1000 1500 2000

FREQUENCY (MHz)

2500 3000

5520 • G13

Conversion Gain, IIP3 and IIP2
vs Supply Voltage

8

LOW SIDE LO

7
6
5
4
3

GAIN (dB)

2
1
0

GAIN

–1
–2

4.0 4.25 4.5 5.04.75

HIGH SIDE LO

LOW SIDE LO

LOW SIDE AND HIGH SIDE LO

SUPPLY VOLTAGE (V)

HIGH SIDE LO

5.25

IIP2

IIP3

5520 • G14

50
45
40
35
30
25
20
15
10
5
0

5.5

5520f

IIP3, IIP2 (dBm)