MAX2037 Maxim Integrated Products, MAX2037 Datasheet
MAX2037
Manufacturer Part Number
MAX2037
Description
Ultrasound Variable Gain Amplifier
Manufacturer
Maxim Integrated Products
Datasheet
1.MAX2037.pdf
(12 pages)
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The MAX2037 8-channel variable-gain amplifier (VGA)
is designed for high linearity, high dynamic range, and
low-noise performance targeting ultrasound imaging
and Doppler applications. Each amplifier features dif-
ferential inputs and outputs and a total gain range of
typically 42dB. In addition, the VGAs offer very low out-
put-referred noise performance suitable for interfacing
with 12-bit ADCs.
The MAX2037 VGA is optimized for less than ±0.25dB
absolute gain error to ensure minimal channel-to-chan-
nel ultrasound beamforming focus error. The device’s
differential outputs are designed to directly drive ultra-
sound ADCs through an external passive anti-aliasing
filter. A switchable clamp is also provided at each ampli-
fier’s outputs to limit the output signals, thereby prevent-
ing ADC overdrive or saturation.
Dynamic performance of the device is optimized to
reduce distortion to support second-harmonic imaging.
The device achieves a second-harmonic distortion
specification of -70dBc at V
5MHz, and an ultrasound-specific* two-tone third-order
intermodulation distortion specification of -52dBc at
V
The MAX2037 operates from a +5.0V power supply,
consuming only 120mW/channel. The device is avail-
able in a 100-pin TQFP package with an exposed pad-
dle. Electrical performance is guaranteed over a 0°C to
+70°C temperature range.
19-0586; Rev 0; 10/06
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.
OUT
= 1.5V
Ultrasound Imaging
P-P
VG_CTL+
VG_CTL-
VG_IN1+
VG_IN8+
VG_IN1-
VG_IN8-
and f
•
•
•
PD
________________________________________________________________ Maxim Integrated Products
IN
Functional Diagram
GND
General Description
V
= 5MHz.
VGA
VGA
•
•
•
CC
•
•
•
-12.5dB TO +29.5dB
MAX2037
CIRCUITRY
OUT
EXT_RES
50Ω
50Ω
50Ω
50Ω
BIAS
•
•
•
V
REF
Ultrasound Variable-Gain Amplifier
Sonar
= 1.5V
Applications
VG_CLAMP_MODE
VG_OUT1+
VG_OUT1-
VG_OUT8+
VG_OUT8-
•
•
•
P-P
and f
IN
=
♦ 8-Channel Configuration
♦ High Integration for Ultrasound Imaging
♦ Pin Compatible with the MAX2038 Ultrasound
♦ Maximum Gain, Gain Range, and Output-Referred
♦ ±0.25dB Absolute Gain Error
♦ Switchable Output VGA Clamp Eliminating ADC
♦ Fully Differential VGA Outputs for Direct ADC
♦ Variable Gain Range Achieves 42dB Dynamic
♦ -70dBc HD2 at V
♦ Two-Tone Ultrasound-Specific* IMD3 of -52dBc at
♦ 120mW Consumption Per Channel
* See the Ultrasound-Specific IMD3 Specification in the
Applications Information section.
†
+ Denotes lead-free package.
T = Tape-and-reel package.
D = Dry packing.
MAX2037CCQ-D
MAX2037CCQ-TD
MAX2037CCQ+D
M AX 2037C C Q + TD 0°C to +70°C
EP = Exposed paddle.
Applications
VGA Plus CW Doppler Beamformer
Noise Optimized for Interfacing with 12-Bit ADCs
Overdrive
Drive
Range
V
OUT
Maximum Gain of 29.5dB
Total Gain Range of 42dB
22nV/ √ H H z z Ultra-Low Output-Referred Noise at
5MHz
Pin-for-Pin 10-Bit Compatibility Supported By
MAX2035/MAX2036
PART
= 1.5V
P-P
0°C to +70°C
0°C to +70°C
0°C to +70°C
and f
OUT
RANGE
TEMP
Ordering Information
= 1.5V
IN
= 5MHz
P-P
(14mm x 14mm)
(14mm x 14mm)
(14mm x 14mm)
(14mm x 14mm)
PIN-PACKAGE
100 TQFP-EP †
100 TQFP-EP †
100 TQFP-EP †
100 TQFP-EP †
and f
IN
Features
= 5MHz
C100E-3
C100E-3
C100E-3
C100E-3
CODE
PKG
1
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