LTM9003

1

9003p

TYPICAL APPLICATION

DESCRIPTION

12-Bit Digital Pre-Distortion

Receiver Subsystem

subsystem for the transmit path of cellular basestations.

Utilizing an integrated system in a package (SiP) tech-nol-

ogy, it includes a downconverting mixer, wideband filter

and analog-to-digital converter (ADC). The system is tuned

for an intermediate frequency (IF) of 184MHz and a signal

bandwidth of up to 125MHz. The 12-bit ADC samples at

rates up to 250Msps. Contact Linear Technology regard-

ing customization.

The high signal level downconverting active mixer is opti-

mized for high linearity, wide dynamic range IF sampling

applications. It includes a differential LO buffer amplifier

driving a double-balanced mixer. Broadband, integrated

transformers on the RF and LO inputs provide single

ended 50Ω interfaces. The RF and LO inputs are internally

matched to 50Ω from 1.1GHz to 1.8GHz.

The CLK input controls converter operation and may be

driven differentially or single-ended. An optional clock duty

cycle stabilizer allows high performance at full speed for

a wide range of clock duty cycles.

L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear

Technology Corporation. All other trademarks are the property of their respective owners.

Protected by U.S. Patents including 5481178, 6580258, 6304066, 6127815, 6498466, 6611131.

FFT of 4-Channel WCDMA Input at 1.95GHz

FEATURES

APPLICATIONS

Pre-Distortion Applications

Range: 400MHz to 3.8GHz

Ripple

250Msps Sample Rate

Components

× 15mm LGA package

IF FREQUENCY (MHz)

154

–110

–90

–100

–80

–50

–60

–70

164

174

194

184

204

214

9003 TA01b

–40

LTM9003

DGND

GND

LO

3.3V

2.5V

RF

9003 TA01

PA

D11

•

•

•

D0

LVDS

Electrical Specifications Subject to Change