MAX2034 Datasheet, PDF (1/13 Pages) Maxim Integrated Products – Quad-Channel, Ultra-Low-Noise Amplifier with Digitally Programmable Input Impedance

19-3969; Rev 1; 3/07
Quad-Channel, Ultra-Low-Noise Amplifier with
Digitally Programmable Input Impedance
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.
Ordering Information
PART
TEMP
RANGE
PIN-
PACKAGE
PKG
CODE
MAX2034CTM+ 0°C to +70°C ^{48 Thin QFN-EP**} T4877-4
(7mm x 7mm)
MAX2034CTM
0°C to +70°C
48 Thin QFN-EP**
(7mm x 7mm)
T4877-4
MAX2034CTM+T 0°C to +70°C ^{48 Thin QFN-EP**} T4877-4
(7mm x 7mm)
MAX2034CTM-T 0°C to +70°C ^{48 Thin QFN-EP**} T4877-4
(7mm x 7mm)
**EP = Exposed paddle.
+Denotes lead-free package.
T = Tape-and-reel package.
*See the Ultrasound-Specific IMD3 Specification in the
Applications Information section.
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
TOP VIEW
36 35 34 33 32 31 30 29 28 27 26 25
GND 37
V_CC 38
GND 39
GND 40
24 OUT4+
23 OUT4-
22 GND
21 GND
V_CC 41
D2 42
PD 43
V_CC 44
V_CC 45
GND 46
ZF1 47
IN1 48
MAX2034
20 VCC
19 D0
18 D1
17 V_CC
16 V_CC
15 GND
14 INB4
13 INC4
1 2 3 4 5 6 7 8 9 10 11 12
THIN QFN
Typical Application Circuit appears at end of data sheet.
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