LT5519

5

5519f

Conversion Gain vs IF Input

Power (One Input Tone)

Conversion Gain, IIP3 and IIP2

vs Supply Voltage

IF, LO and RF Port Return Loss

vs Frequency

TYPICAL PERFOR A CE CHARACTERISTICS

unless otherwise noted. For 2-tone inputs: 2nd IF input = 141MHz at –10dBm. (Test Circuit Shown in Figure 2.)

IF INPUT POWER (dBm)

–16

0

2

4

0

5519 G12

–2

–4

–1

1

3

–3

–5

–6

–12

–8

–4

4

FREQUENCY (MHz)

0

–30

–25

–20

–15

–10

–5

0

500

1000

1500

2000

5519 G13

IF PORT

RF PORT

LO PORT

SUPPLY VOLTAGE (V)

4

–2

0

2

IIP3

IIP2

4

6

10

4.25

4.5

4.75

5

5519 G14

5.25

5.5

8

0

10

GAIN

20

30

40

60

50

LOW SIDE LO

LOW SIDE LO

LOW SIDE AND HIGH SIDE LO

HIGH SIDE LO

HIGH SIDE LO

PI FU CTIO S

GND (Pins 1, 4, 9, 12, 13, 16): Internal Grounds. These

pins are used to improve isolation and are not intended as

DC or RF grounds for the IC. Connect these pins to low

impedance grounds on the PCB for best performance.

ential signal must be applied to these pins through DC

blocking capacitors. The pins must be connected to ground

with 100

Ω resistors (the grounds must each be capable of

sinking about 18mA). For best LO leakage performance,

these pins should be DC isolated from each other. An

impedance transformation is required to match the IF in-

put to the desired source impedance (typically 50

Ωor75Ω).

EN (Pin 5): Enable Pin. When the applied voltage is greater

than 3V, the IC is enabled. When the applied voltage is less

than 0.5V, the IC is disabled and the DC current drops to

about 1

µA.

Typical current consumption is about 2mA. This pin

ate RF bypass capacitors.

Typical current consumption is about 22mA. This pin

should have appropriate RF bypass capacitors as shown

in Figure 2. The 1000pF capacitor should be located as

close to the pins as possible.

Typical current consumption is about 36mA. This pin

tor. A 39nH inductor is shown in Figure 2, though the value

is not critical.

may be DC connected to a low impedance ground to realize

a 50

Ω single-ended output. No external matching compo-

nents are required. A DC voltage should not be applied

across these pins, as they are internally connected through

a transformer winding.

puts. The LT5519 works well with a single-ended source

impedance ground. No external 50

Ω matching compo-

nents are required. An internal resistor is connected

across these pins; therefore, a DC voltage should not be

applied across the inputs.

Exposed Pad (Pin 17): DC and RF ground return for the

entire IC. This must be soldered to the printed circuit board

low impedance ground plane.