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LT5503

TYPICAL PERFOR A CE CHARACTERISTICS

Modulator Supply Current vs

Supply Voltage

Modulator Shutdown Current vs

Supply Voltage

MODEN Current vs Enable

Voltage

SSB Output Power vs

I, Q Amplitude

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

5503 G01

2.5

3.9

TA = 85°C

TA = 27°C

TA = –40°C

VCC1 SUPPLY VOLTAGE (V)

1.8

3.2

4.6

5.3

100

0.1

5503 G02

2.5

3.9

TA = 85°C

TA = 27°C

TA = –40°C

MODEN = LOW

MODEN VOLTAGE (V)

1.8

3.2

4.6

5.3

220

200

180

160

140

120

100

5503 G03

2.5

3.9

TA = 85°C

TA = –40°C

MODEN = VCC1

TA = 27°C

I, Q DIFFERENTIAL INPUT VOLTAGE (VP-P)

0.01

–5

–10

–15

–20

–25

–30

–35

–40

–45

5503 G04

0.1

5.25 VDC

3 VDC

1.8 VDC

I, Q INPUT FREQUENCY (MHz)

–5

–10

–15

–20

–25

–30

–35

–40

5503 G05

0.1

IMAGE

CARRIER

DESIRED

SIDEBAND

FREQUENCY (MHz)

2050

–20

–10

2850

5503 G06

–30

–40

2250

2450

2650

MODRFOUT

MODRFIN

VCC1 = 3VDC, 2.4GHz matching, MODEN = high, GC1 = GC2 = low (max gain), TA = 27°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)

–10

–20

–30

–40

–50

–60

–70

–80

–90

–100

5503 G07

2449.6

2449.8

2450.0

2450.2

2450.4

2450.6

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