General Description

The MAX2036 8-channel variable-gain amplifier (VGA) and programmable octal mixer array 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 50dB (typ). In addition, the VGAs offer very low output-referred noise performance suitable for interfacing with 10-bit ADCs.

Features

♦ 8-Channel Configuration

♦ High Integration for Ultrasound Imaging

   Applications

♦ Pin Compatible with the MAX2035 Ultrasound

   VGA

VGA Features

♦ 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

♦ ±0.5dB Absolute Gain Error

♦ 120mW Consumption per Channel

♦ Switchable Output VGA Clamp Eliminating ADC

   Overdrive

♦ Fully Differential VGA Outputs for Direct ADC

   Drive

♦ Variable Gain Range Achieves 50dB Dynamic

   Range

♦ -62dBc HD2 at VOUT = 1.5VP-P and fIN = 5MHz

♦ Two-Tone Ultrasound-Specific* IMD3 of -52dBc at

   VOUT = 1.5VP-P and fIN = 5MHz

CWD Mixer Features

♦ Low Mixer Noise of -155dBc/Hz at 1kHz Offset

   from 1.25MHz Carrier

♦ Serial-Programmable LO Phase Generator for 4, 8,

   16 LO Quadrature Phase Resolution

♦ Optional Individual Channel 4 x fLO LO Input

   Drive Capability

♦ 269mW Power Consumption per Channel (Normal

   Power Mode) and 226mW Power Consumption

   per Channel (Low-Power Mode)

Applications

   Ultrasound Imaging Sonar