Linear Technology DC426B Quick Start Quide

DC426B DEMO BOARD QUICK START GUIDE
Description
:
The DC426B demo circuit board is intended to demonstrate the capabilities of the LT
signal level upconverting mixer IC for 1900MHz infrastructure applications.
The LT5511 mixer IC is designed to meet the high linearity requirements of cable TV
infrastructure downstream transmitters and wireless infrastructure transmit systems. The IC
includes a differential LO buffer amplifier driving a double-balanced mixer. The LO, RF and IF
ports can be easily matched to a broad range of frequencies for different applications. The high
performance capability of the LO buffer allows the use of a single-ended source, thus eliminating
the need for an LO balun.
The LT5511 mixer delivers +17dBm typical input 3
IIP3 at 1900MHz, with IF input signal levels of –5dBm. The input 1dB compression point is
typically +6dBm.
The DC426B demo board is optimized to upconvert a 50MHz IF input to 1900MHz RF output
with the LO injected from the high-side at 1950MHz.
GND
GND
V BIAS
CC
LO-
1
NC 2
3
IF+ 4
IF- 5
6
CIRCUITS
7
8
GND
(BACKSIDE)
Figure 1. LT5511 IC Block Diagram
rd
order intercept at 950MHz, and +15.5dBm
LO+
16
15
14
LO
BUFFER
13
12
11
BIAS
10
17 9
GND NC

5511 high
V LO
CC
GND
RF+
RF-
GND
EN
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