19-3969; Rev 1; 3/07
Quad-Channel, Ultra-Low-Noise Amplifier with
Digitally Programmable Input Impedance
MAX2034
General Description
The MAX2034 four-channel, low-power, ultra-low-noise
preamplifier is designed for ultrasound and medical
instrumentation applications. Each low-noise amplifier
has a single-ended input, differential output, a highly
accurate 19dB fixed gain, and a wide -3dB bandwidth
of 70MHz. The high-gain accuracy of the amplifier
allows for exceptional channel-to-channel gain match-
ing, which is necessary for high-performance ultra-
sound-imaging applications. The MAX2034 also
includes an on-chip programmable input impedance
feature that allows the device to be compatible with a
variety of common source impedances ranging from
50Ω to 1kΩ. The input impedance of each amplifier
uses a feedback topology for active impedance match-
ing. The active input impedance matching feature
achieves an exceptionally low 2.2dB noise figure with a
source and input impedance of 200Ω.
The MAX2034 has excellent dynamic and linearity per-
formance characteristics optimized for all ultrasound-
imaging modalities including second harmonic 2D
imaging and continuous wave Doppler. The device
achieves a second harmonic distortion of -68dBc at
V
OUT
= 1V
P-P
and f
IN
= 5MHz, and an ultrasound-spe-
cific* two-tone third-order intermodulation distortion per-
formance of -55dBc at V
OUT
= 1V
P-P
and f
IN
= 5MHz.
The MAX2034 is also optimized for quick overload
recovery for operation under the large input signal con-
ditions typically found in ultrasound input-buffer imag-
ing applications.
The MAX2034 is available in a 48-pin thin QFN pack-
age with an exposed paddle. Electrical performance is
guaranteed over a 0°C to +70°C temperature range.
Features
♦
High-Level Integration of 4 Channels
♦
Digitally Programmable Input Impedance (R
IN
) of
50Ω, 100Ω, 200Ω, and 1kΩ
♦
Integrated Input Clamp
♦
Integrated Input-Damping Capacitor
♦
Ultra-Low 2.2dB Noise Figure at R
S
= R
IN
= 200Ω
♦
70MHz, -3dB Bandwidth
♦
Low 58mW/Channel Power Dissipation
♦
HD2 of -68dBc at V
OUT
= 1V
P-P
and f
IN
= 5MHz for
Exceptional Second Harmonic Imaging
Performance
♦
Two-Tone Ultrasound-Specific* IMD3 of -55dBc at
V
OUT
= 1V
P-P
and f
IN
= 5MHz for Exceptional
PW/CW Doppler Performance
♦
Quick Large-Signal Overload Recovery
♦
Single +5V Supply Operation
♦
Sleep Mode
Applications
Ultrasound Imaging
Sonar Signal Amplification
Pin Configuration
OUT1+
OUT2+
OUT3+
OUT1-
OUT2-
GND
GND
GND
V
CC
V
CC
V
CC
TOP VIEW
36 35 34 33 32 31 30 29 28 27 26 25
GND
37
38
39
40
41
42
43
44
45
46
47
48
1
INC1
2
INB1
3
ZF2
4
IN2
5
INC2
6
INB2
7
ZF3
8
IN3
9
INC3
10 11 12
ZF4
INB3
IN4
24
23
22
21
20
19
OUT4+
OUT4-
GND
GND
V
CC
D0
D1
V
CC
V
CC
GND
INB4
INC4
Ordering Information
PART
MAX2034CTM+
MAX2034CTM
TEMP
RANGE
0°C to +70°C
0°C to +70°C
PIN-
PACKAGE
PKG
CODE
V
CC
GND
GND
V
CC
D2
PD
V
CC
V
CC
GND
ZF1
IN1
48 Thin QFN-EP**
T4877-4
(7mm x 7mm)
48 Thin QFN-EP**
T4877-4
(7mm x 7mm)
48 Thin QFN-EP**
T4877-4
(7mm x 7mm)
48 Thin QFN-EP**
T4877-4
(7mm x 7mm)
MAX2034
OUT3-
18
17
16
15
14
13
MAX2034CTM+T 0°C to +70°C
MAX2034CTM-T 0°C to +70°C
**EP
= Exposed paddle.
+Denotes
lead-free package.
T
= Tape-and-reel package.
*See
the Ultrasound-Specific IMD3 Specification in the
Applications Information section.
THIN QFN
Typical Application Circuit appears at end of data sheet.
1
________________________________________________________________
Maxim Integrated Products
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
Quad-Channel, Ultra-Low-Noise Amplifier with
Digitally Programmable Input Impedance
MAX2034
ABSOLUTE MAXIMUM RATINGS
V
CC
to GND ...........................................................-0.3V to +5.5V
Any Other Pins to GND...............................-0.3V to (V
CC
+ 0.3V)
IN_ to INB_ ..................................................................-2V to +2V
INC_ to GND .....................................................-24mA to +24mA
Continuous Power Dissipation (T
A
= +70°C)
48-Pin TQFN (derated 40mW/°C above +70°C) ........3200mW
Operating Temperature Range...............................0°C to +70°C
Junction Temperature ......................................................+150°C
θ
JC
...................................................................................0.8°C/W
θ
JA
....................................................................................25°C/W
Storage Temperature Range .............................-40°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
DC ELECTRICAL CHARACTERISTICS
(MAX2034
Typical Application Circuit,
V
CC
= +4.75V to +5.25V, no input signal applied between IN1–IN4 and GND, T
A
= 0°C to +70°C.
Typical values are at V
CC
= +5.0V and T
A
= +25°C, unless otherwise noted.) (Note 1)
PARAMETER
Supply Voltage
SYMBOL
V
CC
I
CC
I
CC,PD
LOGIC INPUTS (PD, D2, D1, D0)
Input High Voltage
Input Low Voltage
Input Current with Logic-High
Input Current with Logic-Low
V
IH
V
IL
I
IH
I
IL
4.0
1.0
1
1
V
V
µA
µA
Normal mode (PD = 0), no signals applied, see
the
Typical Operating Characteristics
for I
CC
as
a function of input signal
Sleep mode (PD = 1), V
IN_
= 112mV
P-P
at 5MHz
CONDITIONS
MIN
4.75
TYP
5.0
46.5
0.8
MAX
5.25
54.5
4
UNITS
V
Total Supply Current
mA
AC ELECTRICAL CHARACTERISTICS
(MAX2034
Typical Application Circuit,
V
CC
= +4.75V to +5.25V, source impedance R
S
= 200Ω, PD = 0, D2/D1/D0 = 0/1/0 (R
IN
= 200Ω),
signal AC-coupled to IN_, INB_ is AC grounded, V
OUT
is the differential output between OUT_+ and OUT_-, f
IN_
= 5MHz, R
L
= 200Ω
between the differential outputs, C
L
= 20pF from each output to ground, T
A
= 0°C to +70°C. Typical values are at V
CC
= 5.0V and T
A
=
+25°C, unless otherwise noted.) (Note 1)
PARAMETER
SYMBOL
D2/D1/D0 = 0/0/0
Input Resistance
R
IN
D2/D1/D0 = 0/0/1
D2/D1/D0 = 0/1/0
D2/D1/D0 = 0/1/1
Typical Input Resistance Variation
from Nominal Programmed
Input Capacitance
Gain
Part-to-Part Gain Variation from
Nominal
-3dB Small-Signal Gain
Bandwidth
Slew Rate
f
-3dB
C
IN
A
V
(OUT_+ - OUT_-) / IN_
T
A
= +25
o
C, R
L
= 200Ω ±10%
D2/D1/D0 = 0/0/0, (50Ω input impedance),
V
OUT
= 0.2V
P-P
0
CONDITIONS
MIN
TYP
53
105
206
870
±1
40
19
±0.1
±0.5
%
pF
dB
dB
Ω
MAX
UNITS
70
280
MHz
V/µs
2
_______________________________________________________________________________________
Quad-Channel, Ultra-Low-Noise Amplifier with
Digitally Programmable Input Impedance
AC ELECTRICAL CHARACTERISTICS (continued)
(MAX2034
Typical Application Circuit,
V
CC
= +4.75V to +5.25V, source impedance R
S
= 200Ω, PD = 0, D2/D1/D0 = 0/1/0 (R
IN
= 200Ω),
signal AC-coupled to IN_, INB_ is AC grounded, V
OUT
is the differential output between OUT_+ and OUT_-, f
IN_
= 5MHz, R
L
= 200Ω
between the differential outputs, C
L
= 20pF from each output to ground, T
A
= 0°C to +70°C. Typical values are at V
CC
= 5.0V and T
A
=
+25°C, unless otherwise noted.) (Note 1)
PARAMETER
SYMBOL
R
S
= R
IN
= 50Ω
Noise Figure
NF
R
S
= R
IN
= 100Ω
R
S
= R
IN
= 200Ω
R
S
= R
IN
= 1000Ω
Input-Referred Noise Voltage
Input-Referred Noise Current
Second Harmonic
Third Harmonic
HD2
HD3
D2 = 1 (high input impedance), f
IN_
= 5MHz
D2 = 1 (high input impedance), f
IN_
= 5MHz
f
IN_
= 5MHz, V
OUT
= 1V
P-P
differential
f
IN_
= 10MHz, V
OUT
= 1V
P-P
differential
f
IN_
= 5MHz, V
OUT
= 1V
P-P
differential
f
IN_
= 10MHz, V
OUT
= 1V
P-P
differential
4.99MHz tone relative to the second tone at
5.01MHz, which is 25dB lower than the first tone
at 5.00MHz, V
OUT
= 1V
P-P
differential
IMD3
7.49MHz tone relative to the second tone at
7.51MHz, which is 25dB lower than the first tone
at 7.50MHz, V
OUT
= 1V
P-P
differential
Differential output
Gain at V
IN_
= 112mV
P-P
relative to gain at
V
IN_
= 550mV
P-P
Single-ended
Phase difference between channels with V
IN_
=
195mV peak (-3dB full scale), f
IN_
= 10MHz
f
IN_
= 10MHz, V
OUT
= 1V
P-P,
adjacent channels
Supply current settles to 90% of nominal sleep-
mode current I
CC,PD
V
OUT
settles to 90% of final 1V
P-P
output
50
-52
-45
-50
CONDITIONS
MIN
TYP
4.1
2.9
2.2
1.4
0.87
2.1
-68
-66
-50
-44
-55
dBc
nV/√Hz
pA/√Hz
dBc
dBc
dB
MAX
UNITS
MAX2034
Two-Tone Intermodulation
Distortion (Note 2)
Maximum Output Signal
Amplitude
Gain Compression
Output Common-Mode Level
Output Impedance
Phase Matching Between
Channels
Channel-to-Channel Crosstalk
Switch Time from Normal to Sleep
Mode
Switch Time from Sleep to Normal
Mode
4.4
0.5
2.45
5.3
±1.5
66
0.3
0.3
3
V
P-P
dB
V
Ω
deg
dB
ms
ms
Note 1:
Min and max limits at T
A
= +25°C and +70°C are guaranteed by design, characterization, and/or production test.
Note 2:
See the
Ultrasound-Specific IMD3 Specification
in the
Applications Information
section.
_______________________________________________________________________________________
3
Quad-Channel, Ultra-Low-Noise Amplifier with
Digitally Programmable Input Impedance
MAX2034
Typical Operating Characteristics
(MAX2034
Typical Application Circuit,
V
CC
= +4.75V to +5.25V, source impedance R
S
= 200Ω, PD = 0, D2/D1/D0 = 0/1/0 (R
IN
= 200Ω),
signal AC-coupled to IN_, INB_ is AC grounded, V
OUT
is the differential output between OUT_+ and OUT_-, f
IN_
= 5MHz, R
L
= 200Ω
between the differential outputs, C
L
= 20pF from each output to ground, T
A
= 0°C to +70°C, unless otherwise specified.)
SMALL-SIGNAL BANDWIDTH
vs. FREQUENCY
MAX2034 toc01
SMALL-SIGNAL BANDWIDTH
vs. FREQUENCY
MAX2034 toc02
LARGE-SIGNAL BANDWIDTH
vs. FREQUENCY
V
IN_
= 500mV
P-P
,
R
IN
= 200Ω
MAX2034 toc03
25
20
15
GAIN (dB)
V
IN_
= 112mV
P-P
,
R
IN
= 200Ω
25
20
15
GAIN (dB)
10
5
0
-5
V
IN
= 112mV
P-P
R
IN
= 50Ω
25
20
15
GAIN (dB)
10
5
0
-5
10
5
0
-5
0.1
1
10
FREQUENCY (MHz)
100
1000
0.1
1
10
FREQUENCY (MHz)
100
1000
0.1
1
10
FREQUENCY (MHz)
100
1000
LARGE-SIGNAL BANDWIDTH
vs. FREQUENCY
MAX2034 toc04
COMPLEX INPUT IMPEDANCE MAGNITUDE
vs. FREQUENCY
MAX2034 toc05
COMPLEX INPUT IMPEDANCE MAGNITUDE
vs. FREQUENCY
130
120
110
D2/D1/D0 = 0/0/1
R
IN
= 100Ω
MAX2034 toc06
25
20
15
GAIN (dB)
V
IN
= 500mV
P-P
R
IN
= 50Ω
70
65
60
55
D2/D1/D0 = 0/0/0
R
IN
= 50Ω
140
I
Z
IN
I
I
Z
IN
I
10
5
0
-5
0.1
1
10
FREQUENCY (MHz)
100
1000
50
45
40
35
30
0
10
20
30
40
50
FREQUENCY (MHz)
100
90
80
70
60
0
5
10
15
20
25
30
FREQUENCY (MHz)
MAX2034 toc07
250
225
D2/D1/D0 = 0/1/0
R
IN
= 200Ω
1000
850
HARMONIC DISTORTION (dBc)
-30
-40
-50
-60
-70
V
OUT
= 1V
P-P
DIFFERENTIAL
R
L
= 200Ω
I
Z
IN
I
200
175
I
Z
IN
I
700
550
400
THIRD HARMONIC
150
250
125
100
100
0
4
8
12
16
20
FREQUENCY (MHz)
0
4
8
12
16
20
SECOND HARMONIC
-80
0
5
10
15
20
25
30
FREQUENCY (MHz)
FREQUENCY (MHz)
4
_______________________________________________________________________________________
MAX2034 toc09
275
D2/D1/D0 = 0/1/1
R
IN
= 1kΩ
MAX2034 toc08
COMPLEX INPUT IMPEDANCE MAGNITUDE
vs. FREQUENCY
COMPLEX INPUT IMPEDANCE MAGNITUDE
vs. FREQUENCY
1150
-20
HARMONIC DISTORTION
vs. FREQUENCY
Quad-Channel, Ultra-Low-Noise Amplifier with
Digitally Programmable Input Impedance
MAX2034
Typical Operating Characteristics (continued)
(MAX2034
Typical Application Circuit,
V
CC
= +4.75V to +5.25V, source impedance R
S
= 200Ω, PD = 0, D2/D1/D0 = 0/1/0 (R
IN
= 200Ω),
signal AC-coupled to IN_, INB_ is AC grounded, V
OUT
is the differential output between OUT_+ and OUT_-, f
IN_
= 5MHz, R
L
= 200Ω
between the differential outputs, C
L
= 20pF from each output to ground, T
A
= 0°C to +70°C, unless otherwise specified.)
TWO-TONE ULTRASOUND-SPECIFIC IMD3
vs. FREQUENCY
MAX2034 toc10
LARGE-SIGNAL NOISE FIGURE
vs. OFFSET FREQUENCY
R
IN
= 200Ω
RL = 200Ω
f
IN_
= 5MHz
MAX2034 toc11
0
-10
-20
IMD3 (dBc)
-30
-40
-50
-60
-70
0
LARGE-SIGNAL NOISE FIGURE (dB)
V
OUT
= 1V
P-P
DIFFERENTIAL
R
L
= 200Ω
6
5
4
3
2
V
IN
= 112mV
P-P
1
0
SMALL-SIGNAL
NOISE FIGURE
V
IN
= 300mV
P-P
V
IN
= 200mV
P-P
5
10
15
20
25
30
0.1
1
10
100
FREQUENCY (MHz)
OFFSET FREQUENCY (kHz)
GAIN-ERROR HISTOGRAM
MAX2034 toc12
CHANNEL-TO-CHANNEL CROSSTALK
vs. FREQUENCY
-40
-50
CROSSTALK (dB)
-60
-70
-80
-90
-100
V
OUT
= 1V
P-P
DIFFERENTIAL
R
L
= 200Ω
ADJACENT CHANNELS
MAX2034 toc13
50
45
40
35
% OF UNITS
30
25
20
15
10
5
0
-30
SAMPLE SIZE = 243 UNITS
f
IN_
= 5MHz, V
IN
= 112mV
P-P
-0.20
-0.16
-0.12
-0.08
-0.04
0.02
0.06
0.10
0.14
0.18
1
10
FREQUENCY (MHz)
100
GAIN ERROR (dB)
SUPPLY CURRENT
vs. DIFFERENTIAL OUTPUT VOLTAGE
MAX2034 toc14
LARGE-SIGNAL RECOVERY
MAX2034 toc15
130
ALL CHANNELS ACTIVE
f
IN_
= 5MHz
110
SUPPLY CURRENT (mA)
90
INPUT IN_
500mV/div
R
L
= 200Ω
DIFFERENTIAL
OUTPUT
OUT_+ - OUT_-
2.0V/div
70
NO LOAD
50
30
0
1
2
3
4
400ns/div
DIFFERENTIAL OUTPUT VOLTAGE (V
P-P
)
_______________________________________________________________________________________
5
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