Fully Integrated Octal Ultrasound VGA Delivers 39.5dB of Max Gain, 50dB of Dynamic Gain Range, -69dBc of HD2 Performance, and a Low Output-Referred Noise Level of 60nV/RtHz
The MAX2035 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 differential inputs and outputs and a total gain range of typically 50dB. In addition, the VGAs offer very low output-referred noise performance suitable for interfacing with 10-bit ADCs.
The MAX2035 VGA is optimized for less than ±0.5dB absolute gain error to ensure minimal channel-to-channel ultrasound beamforming focus error. The device's differential outputs are designed to directly drive ultrasound ADCs through an external passive antialiasing filter. A switchable clamp is also provided at each amplifier's outputs to limit the output signals, thereby preventing 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 -62dBc at VOUT = 1.5VP-P and fIN = 5MHz, and an ultrasound-specific* two-tone 3rd-order intermodulation distortion specification of -52dBc at VOUT = 1.5VP-P and fIN = 5MHz.
The MAX2035 operates from a +5.0V power supply, consuming only 127mW/channel. The device is available in a 100-pin TQFP package with an exposed paddle. Electrical performance is guaranteed over a 0°C to +70°C temperature range.
MAX2034/MAX2035/MAX2037
EEPW Analog/Mixed-Signal IC Technical Innovation Award Winner 2006
Key Features
Applications/Uses
8-Channel Configuration
High Integration for Ultrasound Imaging Applications
Pin Compatible with the MAX2036 Ultrasound VGA Plus CW Doppler Beamformer
Maximum Gain, Gain Range, and Output-Referred Noise Optimized for Interfacing with 10-Bit ADCs
Maximum Gain of 39.5dB
Total Gain Range of 50dB
60nV Hz Ultra-Low Output-Referred Noise at 5MHz
Pin-for-Pin 12-Bit Compatibility Supported By MAX2037/MAX2038
* Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.
Devices:
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5
MAX2035
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MAX2035EVKIT
See data sheet
MAX2035CCQ
TQFP;100 pin;256 mm²
Dwg: 21-0116D (PDF)
Use pkgcode/variation: C100E-3*
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Hz Ultra-Low Output-Referred Noise at 5MHz
