User Manual

MAX2700/MAX2701
1.8GHz to 2.5GHz Direct Downconversion
Receivers
8 _______________________________________________________________________________________
Typical Operating Characteristics
(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.)
180
170
160
150
140
2.5 2.92.7 3.1 3.3 3.5
I
CC
vs. V
CC
vs. TEMPERATURE
MAX2700-01
V
CC
(V)
I
CC
(mA)
T
A
= +25°C
T
A
= -45°C
T
A
= +85°C
10
12
16
14
18
20
1700 19001800 2000 2100
LNA GAIN vs. FREQUENCY
vs. TEMPERATURE
MAX2700-02
FREQUENCY (MHz)
GAIN (dB)
T
A
= -45°C
T
A
= +25°C
T
A
= +85°C
HIGH-GAIN MODE
-25
-30
-35
-40
1700 19001800 2000 2100
LNA REVERSE ISOLATION
vs. FREQUENCY vs. GAIN MODE
MAX2700-04
FREQUENCY (MHz)
S
12
(dB)
HIGH-GAIN MODE
LOW-GAIN MODE
1.4
1.8
1.6
2.2
2.0
2.6
2.4
1700 1800 18501750 1900 1950 2000
LNA NOISE FIGURE vs. FREQUENCY
vs. TEMPERATURE
MAX2700-05
FREQUENCY (MHz)
NF (dB)
T
A
= +85°C
T
A
= +25°C
T
A
= -45°C
HIGH-GAIN MODE
-10
-8
-6
-4
-2
0
2
4
1700 1800 1900 2000 2100
LNA GAIN vs. FREQUENCY
vs. TEMPERATURE
MAX2700-03
FREQUENCY (MHz)
GAIN (dB)
T
A
= -45°C
T
A
= +25°C
T
A
= +85°C
LOW-GAIN MODE
MAX2700