PDF MAX2035 Download

Description

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-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 amplifier’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 -62dBc at VOUT= 1.5VP-Pand fIN = 5MHz, and an ultrasound-specific* two-tone third-order intermodulation distortion specification of -52dBc at VOUT= 1.5VP-Pand 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 pad. Electrical performance is guaranteed over a 0°C to +70°C temperature range.

Features

1. 8-Channel Configuration
2. High Integration for Ultrasound Imaging Applications
3. Pin Compatible with the MAX2036 Ultrasound VGA Plus CW Doppler Beamformer
4. ±0.5dB Absolute Gain Error
5. Switchable Output VGA Clamp Eliminating ADC Overdrive
6. Fully Differential VGA Outputs for Direct ADC Drive
7. Variable Gain Range Achieves 50dB Dynamic Range
8. -62dBc HD2 at VOUT= 1.5VP-Pand fIN = 5MHz
9. Two-Tone Ultrasound-Specific* IMD3 of -52dBc at VOUT= 1.5VP-Pand fIN = 5MHz
10. 127mW Consumption per Channel