MAX2037
Ultrasound Variable-Gain Amplifier
4 _______________________________________________________________________________________
Typical Operating Characteristics
(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
1.0
0.5
2.0
1.5
3.0
2.5
3.5
4.5
4.0
5.0
0 5.0 7.52.5 10.0 12.5 15.0 17.5 20.0
OVERDRIVE PHASE DELAY
vs. FREQUENCY
MAX2037toc01
FREQUENCY (MHz)
OVERDRIVE PHASE DELAY (ns)
V
IN1
= 35mV
P-P
DIFFERENTIAL
V
IN2
= 87.5mV
P-P
DIFFERENTIAL
GAIN = 20dB
-100
-90
-80
-70
-60
-50
-40
0755025 100 125 150 175 200
POWER SUPPLY MODULATION RATIO
MAX2037 toc02
FREQUENCY (kHz)
PSMR (dBc)
V
OUT
= 1.5V
P-P
DIFFERENTIAL
V
MOD
= 50mV
P-P
, f
CARRIER
= 5MHz,
GAIN = 10dB
-80
-70
-60
-50
-40
-30
-20
-10
0
-15 -5 5 15 25 35
TWO-TONE ULTRASOUND-SPECIFIC
IMD3 vs. GAIN
MAX2037toc03
GAIN (dB)
IMD3 (dBc)
V
OUT
= 1V
P-P
DIFFERENTIAL
f = 10MHz
f = 2MHz
f = 5MHz
Note 2: Specifications at T
A
= +25°C and T
A
= +70°C are guaranteed by production test. Specifications at T
A
= 0°C are guaranteed
by design and characterization.
Note 3: Noise performance of the device is dependent on the noise contribution from the supply to V
REF
. Use a low noise supply for
V
REF
. V
CC
and V
REF
can be connected together to share the same supply voltage if the supply for V
CC
exhibits low noise.
Note 4: See the
Ultrasound-Specific IMD3 Specification
in the
Applications Information
section.
AC ELECTRICAL CHARACTERISTICS (continued)
(Figure 2, V
CC
= V
REF
= 4.75V to 5.25V, V
CM
= (3/5)V
REF
, T
A
= 0°C to +70°C, 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. Typical values are at V
CC
= V
REF
= 5V, T
A
= +25°C, unless otherwise noted.) (Note 2)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Channel-to-Channel Crosstalk
V
OUT
= 1V
P-P
differential, f
RF
= 10MHz,
VG_CTL set for +10dB of gain
-80 dB
Maximum Output Voltage at
Clamp ON
VG_CLAMP_MODE = 0,
VG_CTL set for +20dB of gain,
350mV
P-P
differential input
2.4
V
P-P
d i ffer enti al
Maximum Output Voltage at
Clamp OFF
VG_CLAMP_MODE = 1,
VG_CTL set for +20dB of gain,
350mV
P-P
differential input
2.8
V
P-P
d i ffer enti al
