User Manual

MAX2700/MAX2701
1.8GHz to 2.5GHz Direct Downconversion
Receivers
14 ______________________________________________________________________________________
0
40
20
100
80
60
160
140
120
180
0.50 1.000.75 1.25 1.50 1.75 2.00
MIXER BASEBAND BANDWIDTH vs. R
L
MAX2701-37
R
L
(kΩ)
BANDWIDTH (MHz)
3dB BANDWIDTH
1dB BANDWIDTH
-40
-50
-60
-70
-80
1.150 1.2001.175 1.225 1.250
LO-LNAIN ISOLATION vs. LO FREQUENCY
MAX2701-36
FREQUENCY (GHz)
LO-LNAIN ISOLATION (dB)
DOUBLER ENABLED
DOUBLER DISABLED
1.0
1.6
1.4
1.2
1.8
2.0
2.2
2.4
2.6
2.8
3.0
2.5 2.92.7 3.1 3.3 3.5
MIXER OUTPUT 1dB COMPRESSION
POINT vs. V
CC
vs. R
L
MAX2701-38
V
CC
(V)
MIXER OUTPUT (Vp-p)
R
L
= 1.05kΩ
R
L
= 2.00kΩ
R
L
= 0.56kΩ
-40
-50
-60
-70
-80
1.05 1.151.10 1.20 1.25
LO-RF ISOLATION vs. LO FREQUENCY
(INCLUDING BALUN)
MAX2701-35
FREQUENCY (GHz)
LO-RFIN ISOLATION (dB)
DOUBLER DISABLED
DOUBLER ENABLED
Typical Operating Characteristics (continued)
(MAX2700/MAX2701 EV kit (Figure 3), V
CC
= +3.0V, T
A
= +25°C, SHDN = GAIN_SET = V
CC
, X2_EN = GND, CEXT+ connected to
CEXT-, P
LO
= -13dBm, F
LO
= 980MHz (MAX2700) and 1200MHz (MAX2701), P
LNAIN
= -30dBm, P
RFIN
= -25dBm, LNAIN and RFIN
(single-ended input to balun) driven from 50Ω source, LNAOUT terminated into load; MIX_I, MIX_Q AC-coupled to 2kΩ load; IIN1+,
QIN1+, IIN2+, QIN2+ driven from 1.1kΩ AC-coupled source; IOUT1, QOUT1 AC-coupled to 2kΩ; IOUT2, QOUT2 AC-coupled to
100Ω; input to VGAs, 20mVp-p at 1MHz tone, set V
AGC
= 1.25V, unless otherwise noted.)
MAX2701