LT5518 데이터 시트보기 (PDF) - Linear Technology

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LT5518

1.5GHz–2.4GHz High Linearity Direct Quadrature Modulator

Linear Technology 

LT5518

TYPICAL PERFOR A CE CHARACTERISTICS VCC = 5V, EN = High, TA = 25°C, fLO = 2.14GHz,

PLO = 0dBm. BBPI, BBMI, BBPQ, BBMQ inputs 2.06VDC, Baseband Input Frequency fBB = 2MHz, I and Q 90° shifted without image

or LO feedthrough nulling. fRF = fBB + fLO (upper sideband selection). PRF, OUT = –10dBm (–10dBm/tone for 2-tone measurements),

unless otherwise noted. (Note 3)

Output IP2 vs LO Frequency

65

fBB,1 = 2MHz

fBB,2 = 2.1MHz

60

fIM2 = fBB,1+ fBB,2 + fLO

LO and RF Port Return Loss

vs RF Frequency

0

LO PORT, EN = LOW

–10

55

50

45

40

35

1.3

5V, TA = – 40°C

5V, TA = 25°C

5V, TA = 85°C

4.5V, TA = 25°C

5.5V, TA = 25°C

1.5 1.7 1.9 2.1 2.3

LO FREQUENCY (GHz)

2.5 2.7

5518 G19

–20

RF PORT, EN =

–30

HIGH, NO LO

RF PORT, EN = HIGH,

PLO = 0dBm

–40

LO PORT,

EN = HIGH

RF PORT,

EN = LOW

–50

1.3 1.5

1.7 1.9 2.1 2.3

RF FREQUENCY (GHz)

2.5 2.7

5518 G20

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 internally.

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 (Pin 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, with 2.9kΩ Differential Input Impedance. Internally

biased at about 2.06V. Applied common mode 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-Chan-

nel, with 2.9kΩ Differential Input Impedance. Internally

biased at about 2.06V. Applied common mode voltage

must stay below 2.5V.

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

to the printed circuit board ground plane.

5518f

6

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