LNAs with Step Attenuator and VGA
Typical Operating Characteristics
(MAX2371/MAX2373 EV Kits, VCC = 2.775V, RX_EN = high, R
= 1.1kΩ, LNA_I = high, T = +25°C. For MAX2371, f = 150MHz;
A RF
SET
for MAX2373, f = 900MHz, unless otherwise noted.)
RF
MAX2371
GAIN vs. FREQUENCY
GAIN vs. V
IIP3 vs. V
AGC
AGC
20
15
10
5
20
10
25
20
15
10
5
RF_ATTN = HIGH
RF_ATTN = LOW
RF_ATTN = LOW
0
-10
-20
-30
-40
-50
-60
T
= -40°C
T
= +25°C
T
= +85°C
A
A
A
T
= +85°C
T
= +25°C
T = -40°C
A
A
A
T
= +85°C
A
0
0
T
= +25°C
A
-5
T
= -40°C
-5
-10
A
RF_ATTN = HIGH
-10
-15
RF_ATTN = HIGH
2.4 2.8
RF_ATTN = LOW
1.4
130
140
150
160
170
180
1.2
1.6
2.0
1.3
1.5
1.6
(V)
1.7
1.8
FREQUENCY (MHz)
V
(V)
V
AGC
AGC
P
1dB
vs. V
NOISE FIGURE vs. V
AGC
S11, S22, S12 vs. FREQUENCY
AGC
10.0
5.0
30
25
20
15
10
5
0
-5
S22
RF_ATTN = HIGH
RF_ATTN = HIGH
-10
-15
-20
-25
-30
-35
-40
-45
-50
0
S11
-5.0
-10.0
-15.0
-20.0
-25.0
T
= +85°C
T
= -40°C
T
= +25°C
A
A
A
RF_ATTN = LOW
RF_ATTN = HIGH
RF_ATTN = LOW
RF_ATTN = LOW
2.2
S12
130
0
1.2
1.7
2.7
1.2
1.7
2.2
2.7
140
150
160
170
180
V
(V)
V
(V)
AGC
FREQUENCY (MHz)
AGC
S11, S22, S12 vs. V
AGC
0
-10
-20
-30
-40
-50
-60
S11
S22
S11
RF_ATTN = HIGH
RF_ATTN = LOW
S12
1.2
1.7
2.2
2.7
V
(V)
AGC
4
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MAXIM [ MAXIM INTEGRATED PRODUCTS ]
