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LT5546
(Rev.:RevA)

40MHz to 500MHz VGA and I/Q Demodulator with 17MHz Baseband Bandwidth

Linear Technology 

LT5546

ABSOLUTE AXI U RATI GS

(Note 1)

Supply Voltage ....................................................... 5.5V

Differential Voltage Between 2xLO+ and 2xLO–.......... 4V

IF+, IF– ............................................. –500mV to 500mV

IOUT+, IOUT–, QOUT+, QOUT– .................. VCC – 1.8V to VCC

Operating Ambient Temperature

(Note 2) ...................................................–40°C to 85°C

Storage Temperature Range ..................–65°C to 125°C

Voltage on Any Pin

Not to Exceed ........................ –500mV to VCC + 500mV

UW U

PACKAGE/ORDER I FOR ATIO

TOP VIEW

16 15 14 13

GND 1

12 STBY

IF+ 2

11 2xLO+

IF– 3

17

10 2xLO–

GND 4

9 EN

5678

ORDER PART

NUMBER

LT5546EUF

UF PART MARKING

UF PACKAGE

16-LEAD (4mm × 4mm) PLASTIC QFN

TJMAX = 125°C, θJA = 37°C/W

EXPOSED PAD IS GND (PIN 17)

(MUST BE SOLDERED TO PCB)

5546

Consult LTC Marketing for parts specified with wider operating temperature ranges.

ELECTRICAL CHARACTERISTICS VCC = 3V, f2xLO = 570MHz, P2xLO = –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)

SYMBOL

PARAMETER

CONDITIONS

MIN TYP MAX UNITS

IF Input

fIF

Frequency Range

Nominal Input Level

RSOURCE = 200Ω Differential

Input Impedance

IF+, IF– to GND, EN = VCC

IF+, IF– to GND, EN = GND

40 to 500

MHz

–76 to –19

dBm

100Ω//1.2pF

1pF

NF

Noise Figure at Max Gain

GL

Min Gain (Note 4)

GH

Max Gain (Note 4)

IIP3

Input IP3, Min Gain

Input IP3, Max Gain

IIP2

Input IP2, Min Gain

Input IP2, Max Gain

Demodulator I/Q Output

VCTRL = 1.7V

VCTRL = 0.2V

VCTRL = 1.7V

PIF = –22.5dBm (Note 7)

PIF = –75dBm (Note 7)

VCTRL = 0.2V (Note 9)

VCTRL = 1.7V (Note 9)

7.8

dB

1.6

6

dB

49

56

dB

–1

dBm

– 49

dBm

36

dBm

–25

dBm

Nominal Voltage Swing

Clipping Level

DC Common Mode Voltage

I/Q Amplitude Imbalance

(Note 6)

(Note 6)

(Note 8)

0.8

VP-P

1.47

VP-P

VCC – 1.19

V

0.14

0.6

dB

I/Q Phase Imbalance

(Note 8)

0.6

3

Deg

DC Offset

(Notes 6, 8)

21

mV

Output Driving Capability

Single Ended, CLOAD ≤ 10pF

ro

Small-Signal Output Impedance

(Note 6)

STBY to Turn-On Delay

2

1.5

kΩ

180

Ω

0.3

µs

I/Q Output 1dB Compression

–10

dBm

I/Q Output IM3

PIF, 1 = –25.5dBm, 280MHz

PIF, 2 = –25.5dBm, 280.1MHz (Note 7)

– 49

dBc

5546fa

2

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