LT5568-2EUF 데이터 시트보기 (PDF) - Linear Technology

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LT5568-2EUF

GSM/EDGE Optimized, High Linearity Direct Quadrature Modulator

Linear Technology 

LT5568-2

PI FU CTIO S

EN (Pin 1): Enable Input. When the enable pin voltage is

higher than 1V, the IC is turned on. When the input voltage

is less than 0.5V, the IC is turned off.

GND (Pins 2, 4, 6, 9, 10, 12, 15): Ground. Pins 6, 9, 15

and 17 (exposed pad) are connected to each other inter-

nally. Pins 2 and 4 are connected to each other internally

and function as the ground return for the LO signal. Pins

10 and 12 are connected to each other internally and

function as the ground return for the on-chip RF balun.

For best RF performance, pins 2, 4, 6, 9, 10, 12, 15 and

the Exposed Pad 17 should be connected to the printed

circuit board ground plane.

LO (Pin 3): LO Input. The LO input is an AC-coupled single-

ended input with approximately 50Ω input impedance at

RF frequencies. Externally applied DC voltage should be

within the range –0.5V to VCC + 0.5V in order to avoid

turning on ESD protection diodes.

BBPQ, BBMQ (Pins 7, 5): Baseband Inputs for the Q-chan-

nel, each 50Ω input impedance. Internally biased at about

0.54V. Applied voltage must stay below 2.5V.

VCC (Pins 8, 13): Power Supply. Pins 8 and 13 are con-

nected to each other internally. It is recommended to use

0.1µF capacitors for decoupling to ground on each of

these pins.

RF (Pin 11): RF Output. The RF output is an AC-coupled

single-ended output with approximately 50Ω output im-

pedance at RF frequencies. Externally applied DC voltage

should be within the range –0.5V to VCC + 0.5V in order

to avoid turning on ESD protection diodes.

BBPI, BBMI (Pins 14, 16): Baseband Inputs for the

I-channel, each with 50Ω input impedance. Internally biased

at about 0.54V. Applied voltage must stay below 2.5V.

Exposed Pad (Pin 17): Ground. This pin must be soldered

to the printed circuit board ground plane.

55682f

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