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MAX2037_09

更新时间： 2024-11-07 11:18:07
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美信 - MAXIM 放大器
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13页 197K
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Ultrasound Variable-Gain Amplifier

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19-0ꢀ86; Rev 1; 2/09  
Ultrasound Variable-Gain Amplifier  
MAX2037  
General Description  
Features  
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.  
♦ 8-Channel Configuration  
♦ High Integration for Ultrasound Imaging  
Applications  
♦ Pin Compatible with the MAX2038 Ultrasound  
VGA Plus CW Doppler Beamformer  
♦ Maximum Gain, Gain Range, and Output-Referred  
Noise Optimized for Interfacing with 12-Bit ADCs  
Maximum Gain of 29.5dB  
The MAX2037 VGA is optimized for less than 0.2ꢀdB  
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.  
Total Gain Range of 42dB  
√
22nV/ Hz Ultra-Low Output-Referred Noise at  
5MHz  
Pin-for-Pin 10-Bit Compatibility Supported By  
MAX2035/MAX2036  
♦
0.25dB Absolute Gain ꢀrror  
Dynamic performance of the device is optimized to  
reduce distortion to support second-harmonic imaging.  
The device achieves a second-harmonic distortion  
♦ Switchable Output VGA Clamp ꢀliminating ADC  
Overdrive  
♦ Fully Differential VGA Outputs for Direct ADC  
specification of -70dBc at V  
= 1.ꢀV  
and f  
=
IN  
OUT  
P-P  
Drive  
ꢀMHz, and an ultrasound-specific* two-tone third-order  
intermodulation distortion specification of -ꢀ2dBc at  
♦ Variable Gain Range Achieves 42dB Dynamic  
Range  
V
OUT  
= 1.ꢀV and f = ꢀMHz.  
P-P IN  
♦ -70dBc HD2 at V  
= 1.5V  
and f = 5MHz  
OUT  
P-P IN  
The MAX2037 operates from a +ꢀ.0V power supply,  
consuming only 120mW/channel. The device is avail-  
able in a 100-pin TQFP package with an exposed pad.  
Electrical performance is guaranteed over a 0°C to  
+70°C temperature range.  
♦ Two-Tone Ultrasound-Specific* IMD3 of -52dBc at  
= 1.5V and f = 5MHz  
V
OUT  
P-P  
IN  
♦ 120mW Consumption Per Channel  
*See the Ultrasound-Specific IMD3 Specification in the  
Applications Information section.  
Applications  
Sonar  
Ultrasound Imaging  
Ordering Information  
Functional Diagram  
TꢀMP  
RANGꢀ  
V
CC  
V
REF  
PART  
PIN-PACKAGꢀ  
†
†
MAX2037CCQ+D  
MAX2037CCQ+TD  
0°C to +70°C  
0°C to +70°C  
100 TQFP-EP  
100 TQFP-EP  
MAX2037  
VG_CTL+  
VG_CTL-  
VG_IN1+  
VG_IN1-  
-12.5dB TO +29.5dB  
VG_CLAMP_MODE  
VG_OUT1+  
†
EP = Exposed pad.  
50Ω  
50Ω  
+Denotes a lead(Pb)-free/RoHS-compliant package.  
T = Tape and reel.  
D = Dry packing.  
VGA  
VG_OUT1-  
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
50Ω  
VG_IN8+  
VG_IN8-  
VG_OUT8+  
VG_OUT8-  
VGA  
50Ω  
BIAS  
CIRCUITRY  
PD  
GND  
EXT_RES  
________________________________________________________________ Maxim Integrated Products  
1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,  
or visit Maxim’s website at www.maxim-ic.com.  
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