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LT5571

5571f

TEMPERATURE (

°C)

–90

–70

–80

–40

5571 G29

–50

–60

–40

–20

LO FEEDTHROUGH

IMAGE REJECTION

CALIBRATED WITH PRF = 0dBm

fBBI = 2MHz, 0°

fBBQ = 2MHz, 90° + ϕCAL

IMAGE REJECTION (dBc)

5571 G28

–40

°C

<–60

–56

–52

–36

–48

–44

–40

VBB = 400mVP-P

TYPICAL PERFORMANCE CHARACTERISTICS

Image Rejection Distribution

LO Feedthrough and Image

Rejection vs Temperature After

Calibration at 25°C

VCC = 5V, EN = High, TA = 25°C, fLO = 900MHz,

fRF = 902MHz, PLO = 0dBm. BBPI, BBMI, BBPQ, BBMQ CM input voltage = 0.5VDC, Baseband Input Frequency fBB = 2MHz, I & 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)

PIN FUNCTIONS

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

higher than 1V, the IC is turned on. When the Enable volt-

age is less than 0.5V or if the pin is disconnected, the IC

is turned off. The voltage on the Enable pin should never

exceed VCC by more than 0.5V, in order to avoid possible

damage to the chip.

GND (Pins 2, 4, 6, 9, 10, 12, 15, 17): Ground. Pins 6, 9,

15 and the Exposed Pad 17 are connected to each other

internally. Pins 2 and 4 are connected to each other inter-

nally 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 about 90kΩ differential input impedance. These

pins should be externally biased at about 0.5V. Applied

common mode voltage must stay below 0.6V.

VCC(Pins8,13):PowerSupply.Pins8and13areconnected

to each other internally. 0.1µF capacitors are recommended

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 about 90kΩ differential input impedance. These

pins should be externally biased at about 0.5V. Applied

common mode voltage must stay below 0.6V.

Exposed Pad (Pin 17): Ground. The Exposed Pad must

be soldered to the PCB.

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