MAX2036
Ultrasound VGA Integrated
with CW Octal Mixer
_______________________________________________________________________________________ 9
LARGE-SIGNAL BANDWIDTH
vs. FREQUENCY
MAX2036 toc17
0
-5
-10
-15
-20
-25
-30
-35
-40
0.1 10 1001 1000
GAIN (dB)
V
OUT
= 1V
P-P
DIFFERENTIAL
VG_CTL = +2V
P-P
DIFFERENTIAL
FREQUENCY (MHz)
HARMONIC DISTORTION
vs. DIFFERENTIAL OUTPUT VOLTAGE
MAX2036 toc18
-100
-70
-80
-90
-60
-50
-40
-30
-20
-10
0
01.00.5 1.5 2.0 2.5 3.0
DIFFERENTIAL OUTPUT VOLTAGE (V
P-P
)
HARMONIC DISTORTION (dBc)
f = 5MHz, GAIN = 20dB
THIRD HARMONIC
SECOND HARMONIC
HARMONIC DISTORTION
vs. DIFFERENTIAL OUTPUT LOAD RESISTANCE
MAX2036 toc19
-100
-75
-80
-85
-90
-95
-70
-65
-60
-55
-50
-45
-40
200 800500 1100 1400 1700 2000
DIFFERENTIAL OUTPUT LOAD (Ω)
HARMONIC DISTORTION (dBc)
V
OUT
= 1V
P-P
DIFFERENTIAL
f = 5MHz, GAIN = 20dB
THIRD HARMONIC
SECOND HARMONIC
Typical Operating Characteristics (continued)
(Figure 7, V
CC
= V
REF
= 4.75V to 5.25V, V
GND
= 0V, 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, V
CM
= 3.0V, T
A
= +25°C, unless otherwise noted.)
HARMONIC DISTORTION
vs. DIFFERENTIAL OUTPUT LOAD CAPACITANCE
MAX2036 toc20
-100
-75
-80
-85
-90
-95
-70
-65
-60
-55
-50
-45
-40
54525 65 85 105
DIFFERENTIAL OUTPUT LOAD (pF)
HARMONIC DISTORTION (dBc)
V
OUT
= 1V
P-P
DIFFERENTIAL
f = 5MHz, GAIN = 20dB
THIRD HARMONIC
SECOND HARMONIC
HARMONIC DISTORTION
vs. FREQUENCY
MAX2036 toc21
-100
-50
-60
-70
-80
-90
-40
-30
-20
-10
0
02010 30 40 50
FREQUENCY (MHz)
HARMONIC DISTORTION (dBc)
V
OUT
= 1V
P-P
DIFFERENTIAL
GAIN = 20dB
THIRD HARMONIC
SECOND HARMONIC
TWO-TONE ULTRASOUND-SPECIFIC IMD3
vs. FREQUENCY
MAX2036 toc22
-70
-20
-30
-40
-50
-60
-10
0
0105152025
FREQUENCY (MHz)
IMD3 (dBc)
V
OUT
= 1V
P-P
DIFFERENTIAL
GAIN = 20dB
0
10
5
25
20
15
30
35
45
40
50
-4.50 -3.00
-2.25-3.75
-1.50
-0.75
0.75
1.50
2.25
3.00
3.75
4.50
GAIN ERROR (dB)
% OF UNITS
GAIN ERROR HISTOGRAM
MAX2036 toc23
SAMPLE SIZE = 188 UNITS
f
IN_
= 5MHz, GAIN = 20dB
-100
-75
-50
-25
0
25
50
75
100
-15 5-5 15 25 35 45
GAIN (dB)
OFFSET VOLTAGE (mV)
OUTPUT COMMON-MODE OFFSET VOLTAGE
vs. GAIN
MAX2036 toc24
DIFFERENTIAL OUTPUT IMPEDANCE
MAGNITUDE vs. FREQUENCY
MAX2036 toc25
0.1 10 100
FREQUENCY (MHz)
Z
OUT
(Ω)
1
200
60
80
100
120
140
180
160
