LT5517

5

5517f

PI FU CTIO S

GNDRF (Pins 1, 4): Ground Pins for RF Termination.

These pins are not internally connected, and should be

connected to the PCB ground plane for best RF isolation.

are internally biased to 2.30V. These two pins should be

DC blocked when connected to ground or other matching

components. The inputs can be terminated in a single-

ended configuration, but differential input drive is pre-

ferred for best performance. An external matching network

is required for impedance transformation.

EN (Pin 5): Enable Pin. When the input voltage is higher

than 1.6V, the circuit is completely turned on. When the

input voltage is less than 1.3V, the circuit is turned off.

should be decoupled using 1000pF and 0.1

µF capacitors.

GND (Pins 9, 11): Ground Pins. These pins are internally

tied together and to the Exposed Pad. They should be

connected to the PCB ground plane.

2XLO (Pin 10): 2XLO Input Pin. This pin is internally

biased to 1V. The input signal’s frequency should be twice

that of the desired demodulator LO frequency. The pin

should be AC coupled with an external DC blocking

capacitor.

Pins of the Q-Channel. The internal DC bias voltage is

Pins of the I-Channel. The internal DC bias voltage is

Exposed Pad (Pin 17): Ground Return for the Entire IC.

This pin must be soldered to the printed circuit board

ground plane.

RF-LO Isolation

vs RF Input Power

Conv Gain

vs Baseband Frequency

RF, 2XLO Port Return Loss

vs Frequency

RF INPUT POWER (dBm)

–15

100

110

120

5

5517 G13

90

80

–10

–5

0

10

70

60

50

BASEBAND FREQUENCY (MHz)

–2

0

2

4

6

0.1

10

100

1000

5517 G14

–4

1

FREQUENCY (GHz)

0

–10

–5

0

1.60

5517 G15

–15

RF

LO

–20

–25

0.40

0.80

1.20

2

TYPICAL PERFOR A CE CHARACTERISTICS