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LT5528

5528f

LO and RF Port Return Loss vs

RF Frequency

123

I AND Q BASEBAND VOLTAGE (VP-P, DIFF)

–25

–30

–40

–45

–35

–50

5528 G18

fBBI = 2MHz, 0°

fBBQ = 2MHz, 90°

LOFT

4.5V

5.5V

RF FREQUENCY (GHz)

1.3

5528 G19

1.9

1.7

1.5

2.1

2.3

2.7

2.5

–10

–20

–30

–40

–50

RF PORT,

EN = HIGH,

PLO = OFF

RF PORT,

EN = LOW

LO PORT,

EN = HIGH

LO PORT, EN = LOW

RF PORT,

EN = HIGH,

PLO = 0dBm

EN (Pin 1): Enable Input. When the EN 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 45Ω input impedance. Internally biased at about

0.525V. 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 45Ω input impedance. These pins are

internally biased at about 0.525V. Applied voltage must

stay below 2.5V.

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

to the printed circuit board ground plane.

LO Feed-Through and Image

Rejection at 2140MHz vs Baseband

Voltage and Supply Voltage

VCC = 5V, EN = High, TA = 25°C, fLO = 2.14GHz, PLO

= 0dBm. BBPI, BBMI, BBPQ, BBMQ inputs 0.525VDC, Baseband Input Frequency fBB = 2MHz, I&Q 90° shifted. fRF = fBB + fLO (upper

sideband selection). PRF, OUT = –10dBm (–10dBm/tone for 2-tone measurements), unless otherwise noted. (Note 3)

RF Output Power vs

RF Frequency at 1VP-P

Differential Baseband Drive

RF FREQUENCY (GHz)

1.3

–2

–4

–6

–8

–10

–14

–12

5528 G20

1.9

1.7

1.5

2.1

2.3

2.7

2.5

4.5V, 25°C

5V, –40°C

5V, 25°C

5V, 85°C

5.5V, 25°C

VBBI = 1VP-P, DIFF

VBBQ = 1VP-P, DIFF

TYPICAL PERFOR A CE CHARACTERISTICS

PI FU CTIO S

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