LT5503 datasheet(5/20 Pages) LINER

Part #	LT5503

Description	1.2GHz to 2.7GHz Direct IQ Modulator and Mixer

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Manufacturer	LINER [Linear Technology]

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LT5503

5

5503f

TYPICAL PERFOR A CE CHARACTERISTICS

Modulator Supply Current vs

Supply Voltage

Modulator Shutdown Current vs

Supply Voltage

MODEN Current vs Enable

Voltage

Baseband Frequency Response

I/Q Amplitude = 1VP-P

MODRFIN and MODRFOUT

Return Loss 2.4GHz Matching

Typical SSB Spectrum

VCC1 SUPPLY VOLTAGE (V)

1.8

3.2

4.6

5.3

38

36

34

32

30

28

26

24

22

20

5503 G01

2.5

3.9

TA = 85°C

TA = 25°C

TA = –40°C

VCC1 SUPPLY VOLTAGE (V)

1.8

3.2

4.6

5.3

100

10

1

0.1

5503 G02

2.5

3.9

TA = 85°C

TA = 25°C

TA = –40°C

MODEN = LOW

MODEN VOLTAGE (V)

1.8

3.2

4.6

5.3

220

200

180

160

140

120

100

80

60

40

5503 G03

2.5

3.9

TA = 85°C

TA = –40°C

MODEN = VCC1

TA = 25°C

I, Q INPUT FREQUENCY (MHz)

1

0

–5

–10

–15

–20

–25

–30

–35

–40

5503 G05

0.1

10

IMAGE

CARRIER

DESIRED

SIDEBAND

FREQUENCY (MHz)

2050

–20

–10

2850

5503 G06

–30

–40

2250

2450

2650

0

MODRFOUT

MODRFIN

VCC1 = 3VDC, 2.4GHz matching, MODEN = high, GC1 = GC2 = low (max gain), TA = 25°C, MODRFIN = 2.45GHz at –16dBm, (I–IB) and

(Q–QB) = 100kHz sine at 1VP-P differential, Q leads I by 90°, unless otherwise noted. (Test circuit shown in Figure 2.)

(I/Q Modulator)

FREQUENCY (MHz)

0

–10

–20

–30

–40

–50

–60

–70

–80

–90

–100

5503 G07

2449.6

2449.8

2450.0

2450.2

2450.4

2450.6

SUPPLY VOLTAGE (V)

1.8

–2

–3

–4

–5

–6

2.4

3.0

3.6

4.2

5503 TA01b

4.8

5.4

PLO1 = –12dBm

PLO2 = –18dBm

BASEBAND = 1VP-P

TA = 25°C

2.45GHz Modulated Output

Power vs Supply Voltage

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