Linear Technology 642 Quick Start Manual

QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 642
Description
Demonstration circuit 642 is an upconverting mixer
®
featuring the LT 5521. The LT
3.7GHz High Linearity Up/Downconverting Mixer
optimized for wireless and cable infrastructure
applications. A high-speed, internally matched LO
amplifier drives a double-balanced mixer core,
allowing the use of a low power, single-ended LO
source.
Table 1. Typical Performance Summary (T
PARAMETER
Supply Voltage
Supply Current
Maximum Shutdown Current
RF Frequency Range
IF Input Return Loss
LO Input Return Loss
RF Output Return Loss
LO Input Power
Conversion Gain
SSB Noise Figure
rd
Input 3 Order Intercept
nd
Input 2 Order Intercept
Input 1dB Compression
Lo To Rf Leakage
LO to IF leakage
®
5521 is a 10MHz to
= 25°C)
A
CONDITION (f = 250MHz, f =1700MHz)
IF LO
V = 5V, EN = High
CC
V = 5V, EN = Low
CC
Z = 50 , with external matching
0
Z = 50
0
Z = 50
0
P = -7dBm, P = -5dBm
IF LO
P = -5dBm
LO
2-Tone, -7dBm/Tone, ∆f = 5MHz, P
2-Tone, -7dBm/Tone, ∆f = 5MHz, P
P = -5dBm
LO
P = -5dBm
LO
P = -5dBm
LO
HIGH LINEARITY UPCONVERTING MIXER
The IF port can be easily matched to a broad range of
frequencies for use in many different applications.
Demonstration circuit 642 is designed for an RF
output frequency range from 1.75GHz to 2.15GHz and
is optimized for a 250MHz IF input frequency.
Design files for this circuit board are available. Call
the LTC factory.
LT is a registered trademark of Linear Technology Corporation.
= -5dBm
LO
= -5dBm
LO
LT5521
VALUE
4.5V to 5.25V
82mA
100µA
1.75GHz to 2.15GHz
15dB
12dB
12dB
-10dBm to 0dBm
-0.5dB
12.5dB
+24.2dBm
+49dBm
+10dBm
-42dBm
-40dBm
1