LTC4401 datasheet(7/12 Pages) LINER

7 / 12 page

LT5516

5516f

GND (Pins 1, 4): Ground Pin.

RF+, RF– (Pins 2, 3): Differential RF Input Pins. These

pins are internally biased to 1.54V. They must be driven

with a differential signal. An external matching network is

required for impedance transformation.

VCC (Pins 5, 8, 9, 12): Power Supply Pins. These pins

should be decoupled using 1000pF and 0.1

µF capacitors.

VCM (Pin 6): Common Mode and DC Return for the I-Mixer

and Q-Mixer. An external resistor must be connected

between this pin and ground to set the dc bias current of

the I/Q demodulator.

EN (Pin 7): 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.

PI FU CTIO S

LO+, LO– (Pins 10, 11): Differential Local Oscillator Input

Pins. These pins are internally biased to 2.44V. They can

be driven single-ended by connecting one to an AC ground

through a 1000pF capacitor. However, differential input

drive is recommended to minimize LO feedthrough to the

RF input pins.

QOUT–, QOUT+ (Pins 13, 14): Differential Baseband Output

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

–0.68V for each pin.

IOUT–, IOUT+ (Pins 15, 16): Differential Baseband Output

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

–0.68V for each pin.

GROUND (Pin 17, Backside Contact): Ground Return for

the Entire IC. This pin must be soldered to the printed

circuit board ground plane.

BLOCK DIAGRA

RF+

IOUT

LO+

LO–

°/90°

BIAS

IOUT

–

QOUT

–

LO BUFFERS

LPF

I-MIXER

LPF

Q-MIXER

VCC

GND GND

VCC

RF –

5516 BD

VCM 6

RF AMP

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