Manual

MAX2685
Low-Cost, 900MHz, Low-Noise Amplifier
and Downconverter Mixer
_______________________________________________________________________________________ 5
Typical Operating Characteristics (continued)
(MAX2685 EV kit, V
CC
= V
SHDN
= +3V, f
LNAIN
= f
MIXIN
= 880MHz, f
LO
= 960MHz, P
LNAIN
= -30dBm, P
LO
= -8dBm, P
MIXIN
= -25dBm,
differential IFOUT operation, Z
o
= 50Ω, T
A
= +25°C, unless otherwise noted.)
-12
-6
-8
-10
-4
-2
0
2
4
6
8
60 70 80 90 100
MIXER GAIN vs. IF FREQUENCY
MAX2685 toc13
IF FREQUENCY (MHz)
GAIN (dB)
BANDWIDTH DETERMINED BY
DIFFERENTIAL-TO-SINGLE-ENDED
CONVERTER CIRCUIT
GAIN = HIGH
GAIN = LOW
0
2
1
4
3
6
5
7
-15 -10 -5 0
MIXER GAIN vs. LO POWER
MAX2685 toc14
LO POWER (dBm)
GAIN (dB)
GAIN = HIGH
GAIN = LOW
10.0
11.5
11.0
10.5
12.0
12.5
13.0
13.5
14.0
14.5
15.0
-15 -10 -5 0
MIXER NOISE FIGURE vs. LO POWER
MAX2685 toc15
LO POWER (dBm)
NOISE FIGURE (dB)
GAIN = HIGH
GAIN = LOW
-15
-12
-13
-14
-10
-11
-6
-7
-8
-9
-5
750 800 850 900 950 1000 1050 1100
LO PORT RETURN LOSS vs. FREQUENCY
MAX2685 toc16
FREQUENCY (MHz)
RETURN LOSS (dB)