LT5519

1

5519f

s

Wide RF Frequency Range: 0.7GHz to 1.4GHz

s

17.1dBm Typical Input IP3 at 1GHz

s

On-Chip RF Output Transformer

s

On-Chip 50

Ω Matched LO and RF Ports

s

Single-Ended LO and RF Operation

s

Integrated LO Buffer: –5dBm Drive Level

s

Low LO to RF Leakage: – 44dBm Typical

s

Noise Figure: 13.6dB

s

Wide IF Frequency Range: 1MHz to 400MHz

s

Enable Function with Low Off-State Leakage Current

s

Single 5V Supply

s

Small 16-Lead QFN Plastic Package

0.7GHz to 1.4GHz

High Linearity

Upconverting Mixer

The LT

requirements of wireless and cable infrastructure trans-

mission systems. A high speed, internally 50

Ω matched,

LO amplifier drives a double-balanced mixer core, allow-

ing the use of a low power, single-ended LO source. An RF

output transformer is integrated, thus eliminating the

need for external matching components at the RF output,

while reducing system cost, component count, board area

and system-level variations. The IF port can be easily

matched to a broad range of frequencies for use in many

different applications.

The LT5519 mixer delivers +17.1dBm typical input 3rd

order intercept point at 1GHz with IF input signal levels of

–10dBm. The input 1dB compression point is typically

+5.5dBm. The IC requires only a single 5V supply.

, LTC and LT are registered trademarks of Linear Technology Corporation.

Figure 1. Frequency Conversion in Wireless Infrastructure Transmitter

RF Output Power, IM3 and IM2

vs IF Input Power (Two Input Tones)

PA

LO INPUT

–5dBm

BIAS

EN

10pF

5pF

5pF

85

Ω

5519 F01a

BPF

BPF

GND

4:1

220pF

220pF

33pF

100

Ω

100

Ω

(OPTIONAL)

LT5519

1

µF

1000pF

39nH

s

Wireless Infrastructure

s

Cable Downlink Infrastructure

s

Point-to-Point and Point-to-Multipoint Data

Communications

s

High Linearity Frequency Conversion

FEATURES

DESCRIPTIO

APPLICATIO S

TYPICAL APPLICATIO

IF INPUT POWER (dBm/TONE)

–16

–30

–10

10

0

5519 F01b

–50

–70

–40

–20

0

–60

–80

–90

–12

–8

–4

4

IM3

IM2