Datasheet
MAX2037
Ultrasound Variable-Gain Amplifier
6 _______________________________________________________________________________________
30
25
20
15
10
5
0
-5
-10
0.1 10 1001 1000
LARGE-SIGNAL BANDWIDTH
vs. FREQUENCY
MAX2037 toc13
FREQUENCY (MHz)
GAIN (dB)
V
OUT
= 1.5V
P-P
DIFFERENTIAL
VG_CTL = -1V
P-P
DIFFERENTIAL
20
15
10
5
0
-5
-10
-15
-20
0.1 10 1001 1000
LARGE-SIGNAL BANDWIDTH
vs. FREQUENCY
MAX2037 toc14
FREQUENCY (MHz)
GAIN (dB)
V
OUT
= 1.5V
P-P
DIFFERENTIAL
VG_CTL = +0.6V
P-P
DIFFERENTIAL
10
5
0
-5
-10
-15
-20
-25
-30
0.1 10 1001 1000
LARGE-SIGNAL BANDWIDTH
vs. FREQUENCY
MAX2037 toc15
FREQUENCY (MHz)
GAIN (dB)
V
OUT
= 1.5V
P-P
DIFFERENTIAL
VG_CTL = +1.5V
P-P
5
0
-5
-10
-15
-20
-25
-30
-35
0.1 10 1001 1000
LARGE-SIGNAL BANDWIDTH
vs. FREQUENCY
MAX2037 toc16
FREQUENCY (MHz)
GAIN (dB)
V
OUT
= 1V
P-P
DIFFERENTIAL
VG_CTL = +1.7V
P-P
DIFFERENTIAL
0
-5
-10
-15
-20
-25
-30
-35
-40
0.1 10 1001 1000
LARGE-SIGNAL BANDWIDTH
vs. FREQUENCY
MAX2037 toc17
FREQUENCY (MHz)
GAIN (dB)
V
OUT
= 0.5V
P-P
DIFFERENTIAL
VG_CTL = +2V
P-P
DIFFERENTIAL
-100
-80
-90
-60
-70
-40
-50
-30
-10
-20
0
0 1.50.5 1.0 2.0 2.5 3.0
HARMONIC DISTORTION
vs. DIFFERENTIAL OUTPUT VOLTAGE
MAX2037 toc18
DIFFERENTIAL OUTPUT VOLTAGE (V
P-P
)
HARMONIC DISTORTION (dBc)
THIRD HARMONIC
SECOND HARMONIC
V
OUT
= 1V
P-P
DIFFERENTIAL
f = 5MHz, GAIN = 10dB
Typical Operating Characteristics (continued)
(Figure 2, V
CC
= V
REF
= 4.75V to 5.25V, V
GND
= 0, PD = 0, VG_CLAMP_MODE = 1, f
RF
= 5MHz, capacitance to GND at each of the
VGA differential outputs is 60pF, differential capacitance across the VGA outputs is 10pF, R
L
= 1kΩ, T
A
= 0°C to +70°C. Typical
values are at V
CC
= V
REF
= 5V, T
A
= +25°C, unless otherwise noted.)
0
10
20
30
40
50
-15 5-5 15 25 35
OUTPUT-REFERRED NOISE VOLTAGE
vs. GAIN
MAX2037toc10
GAIN (dB)
f = 5MHz
OUTPUT-REFERRED NOISE VOLTAGE (nV/
√
Hz)
-25
-5
-15
15
5
25
35
-2.5 -0.5-1.5 0.5 1.5 2.5
GAIN vs. DIFFERENTIAL ANALOG
CONTROL VOLTAGE (VG_CTL)
MAX2037toc11
VG_CTL (V
P-P
DIFFERENTIAL)
f = 5MHz
GAIN (dB)
40
35
30
25
20
15
10
5
0
0.1 10 1001 1000
LARGE-SIGNAL BANDWIDTH
vs. FREQUENCY
MAX2037toc12
FREQUENCY (MHz)
GAIN (dB)
V
OUT
= 1.5V
P-P
DIFFERENTIAL
VG_CTL = -2V
P-P
DIFFERENTIAL