Document
19-3969; Rev 1; 3/07
MAX2034
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 matching, which is necessary for high-performance ultrasound-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 matching. 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 performance characteristics optimized for all ultrasoundimaging modalities including second harmonic 2D imaging and continuous wave Doppler. The device achieves a second harmonic distortion of -68dBc at VOUT = 1VP-P and fIN = 5MHz, and an ultrasound-specific* two-tone third-order intermodulation distortion performance of -55dBc at VOUT = 1VP-P and fIN = 5MHz.
The MAX2034 is also optimized for quick overload recovery for operation under the large input signal conditions typically found in ultrasound input-buffer imaging applications.
The MAX2034 is available in a 48-pin thin QFN package with an exposed paddle. Electrical performance is guaranteed over a 0°C to +70°C temperature range.
Ordering Information
PART
TEMP RANGE
PINPACKAGE
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 (RIN) of
50Ω, 100Ω, 200Ω, and 1kΩ ♦ Integrated Input Clamp ♦ Integrated Input-Damping Capacitor ♦ Ultra-Low 2.2dB Noise Figure at RS = RIN = 200Ω ♦ 70MHz, -3dB Bandwidth ♦ Low 58mW/Channel Power Dissipation ♦ HD2 of -68dBc at VOUT = 1VP-P and fIN = 5MHz for
Exceptional Second Harmonic Imaging Performance ♦ Two-Tone Ultrasound-Specific* IMD3 of -55dBc at VOUT = 1VP-P and fIN = 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
OUT3-
OUT3+
OUT2-
OUT2+
OUT1-
OUT1+
GND
GND
VCC
VCC
GND
TOP VIEW
VCC
36 35 34 33 32 31 30 29 28 27 26 25
GND 37 VCC 38 GND 39 GND 40
24 OUT4+ 23 OUT422 GND 21 GND
VCC 41 D2 42 PD 43 VCC 44 VCC 45 GND 46 ZF1 47 IN1 48
MAX2034
20 VCC 19 D0 18 D1 17 VCC 16 VCC 15 GND 14 INB4 13 INC4
1 2 3 4 5 6 7 8 9 10 11 12
IN4
ZF4
INB3
INC3
IN3
ZF3
INB2
INC2
IN2
ZF2
INB1
INC1
THIN QFN
Typical Application Circuit appears at end of data sheet.
________________________________________________________________ Maxim Integrated Products 1
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
VCC to GND ...........................................................-0.3V to +5.5V Any Other Pins to GND...............................-0.3V to (VCC + 0.3V) IN_ to INB_ ..................................................................-2V to +2V INC_ to GND .....................................................-24mA to +24mA Continuous Power Dissipation (TA = +70°C)
48-Pin TQFN (derated 40mW/°C above +70°C) ........3200mW
Operating Temperature Range...............................0°C to +70°C
Junction Temperature ......................................................+150°C
θJC...................................................................................0.8°C/W θJA ....................................................................................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 i.