LTC5556

1

Rev 0

For more information www.analog.com

Document Feedback

TYPICAL APPLICATION

FEATURES

DESCRIPTION

1.5GHz to 7GHz Dual

Programmable Gain

Downconverting Mixer

The LTC®5556 dual programmable gain downconvert-

ing mixer is ideal for diversity and MIMO receivers that

require precise gain setting. Each channel incorporates

an active mixer and a digital IF VGA with 15.5dB gain

control range. The IF gain of each channel is programmed

in 0.5dB steps through the SPI.

Enable pins for each channel allow fast turn-on and shut-

down. A reduced power mode is also available.

The device has the same functionality as the LTC5566,

but the mixers are optimized for a higher 3GHz to 7GHz

RF frequency range and the IF is optimized for use up to

900MHz. The mixers may be used down to 1.5GHz, or up

to 8GHz with degraded performance.

Dual Programmable Gain Downconverting Mixers

PART NUMBER

OPTIMUM RF RANGE

IF RANGE

LTC5556

3GHz to 7GHz

1MHz to 900MHz

LTC5566

300MHz to 4.5GHz

1MHz to 500MHz

Dual Channel MIMO Receiver with Programmable 0.5dB Gain Steps

LTC5556 Conversion Gain vs

RF Frequency and IF Attenuation

(0.5dB Gain Steps)

APPLICATIONS

n

4G and 5G MIMO Receivers

n

5.1GHz to 5.9GHz LTE-U

n

Distributed Antenna Systems (DAS)

n

Network Test/Monitoring Equipment

n

Fixed Satellite Services

All registered trademarks and trademarks are the property of their respective owners.

n

9dB Power Conversion Gain

n

32dBm Output IP3

n

15.5dB Range IF DVGA in 0.5dB Steps

n

IF Frequency Range Up to 900MHz

n

Reduced Power Mode

n

3.3V Single Supply

n

Simple SPI for Fast Development

n

n

Very Small Solution Size

n

32-Lead (5mm × 5mm) QFN Package

SDI

LTC5556

LPF

3.3V

3.3V

3.3V

3.3V

BPF

BPF

5556 TA01a

IF1

LO

LO

LTC6430

IF2

LTC6430

LNA

LNA

CSB

RF1

RF2

CLK

SDO

SPI

BPF

BPF

LO

IF = 270MHz

LOW SIDE LO

RF INPUT FREQUENCY (GHz)

2 2.5 3 3.5 4 4.5 5 5.5 6 6.5 7

–10

–8

–6

–4

–2

0

2

4

6

8

10

5556 TA01b