LT5546 datasheet(6/12 Pages) LINER

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LT5546

5546f

IF Detector Output Voltage vs IF

Input CW Power and IF Frequency

IF Detector Output Voltage

vs IF Input CW Power and

Supply Voltage

Phase Relation Between I and Q

Outputs vs LO Input Power

GND (Pins 1, 4 and 17): Ground. Pins 1 and 4 are

connected to each other internally. The exposed pad (Pin

17) is not connected internally to Pins 1 and 4. For chip

functionality, the exposed pad and either Pin 1 or Pin 4

must be connected to ground. For best RF performance,

Pin 1, Pin 4 and the exposed pad should be connected to

RF ground.

IF+, IF– (Pins 2, 3): Differential Inputs for the IF Signal.

Each pin must be DC grounded through an external

inductor or RF transformer with central ground tap. This

path should have a DC resistance lower than 2

Ωtoground.

VCC (Pins 5 and 8): Power Supply. These pins should be

decoupled to ground using 1000pF and 0.1

µF capacitors.

VCTRL (Pin 6): VGA Gain Control Input. This pin controls

the IF gain and its typical input voltage range is 0.2V to

1.7V. It is internally biased via a 25k resistor to 0.2V,

setting a low gain if the VCTRL pin is left floating.

IF DET (Pin 7): IF Detector Output. For strong IF input

signals, the DC level at this pin is a function of the IF input

signal level.

EN (Pin 9): Enable Input. When the enable pin voltage is

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

input voltage is less than 0.5V, the IC is turned off, except

the part of the circuit associated with standby mode.

2xLO–, 2xLO+ (Pins 10, 11): Differential Inputs for the

2xLO Input. The 2xLO input frequency must be twice that

of the IF frequency. The internal bias voltage is VCC – 0.4V.

STBY (Pin 12): Standby Input. When the STBY pin is

higher than 1V, the standby mode circuit is turned on to

prebias the I/Q buffers. When the STBY pin is less than

0.5V, the standby mode circuit is turned off.

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

puts of the Q Channel. Internally biased at VCC – 1.19V.

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

of the I Channel. Internally biased at VCC – 1.19V.

PI FU CTIO S

TYPICAL PERFOR A CE CHARACTERISTICS VCC = 3V, f2×LO = 570MHz, P2×LO = –5dBm

(Note 5), fIF = 284MHz, PIF = –30dBm, I and Q outputs 800mVP-P into 4kΩ differential load, TA = 25°C, EN = VCC, STBY = VCC,

unless otherwise noted. (Note 3)

IF INPUT CW POWER (dBm)

–40

0.2

0.4

0.6

0.8

1.0

1.2

1.4

–30

–20

–10

5546 G16

fIF = 280MHz

1.8V

5.25V

IF INPUT CW POWER (dBm)

–40

1.2

1.4

5546 G17

1.0

0.8

–30

–20

–10

0.6

0.4

0.2

VCC = 3V

fIF = 500MHz

fIF = 40MHz

fIF = 280MHz

LO INPUT POWER (dBm)

–20

–5

5546 G18

–15

–10

010

fIF = 284MHz, 25°C

fIF = 284MHz, –40°C

fIF = 284MHz, 85°C

fIF = 40MHz, 25°C

fIF = 500MHz, 25°C

VCC = 3V

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