MAX2037 データシートの表示（PDF） - Maxim Integrated

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MAX2037

Ultrasound Variable-Gain Amplifier

Maxim Integrated 

19-0586; Rev 0; 10/06

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Ultrasound Variable-Gain Amplifier

General Description

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 VOUT = 1.5VP-P and fIN =

5MHz, and an ultrasound-specific* two-tone third-order

intermodulation distortion specification of -52dBc at

VOUT = 1.5VP-P and fIN = 5MHz.

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.

Applications

Ultrasound Imaging

Sonar

Features

♦ 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

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 Error

♦ Switchable Output VGA Clamp Eliminating ADC

Overdrive

♦ Fully Differential VGA Outputs for Direct ADC

Drive

♦ Variable Gain Range Achieves 42dB Dynamic

Range

♦ -70dBc HD2 at VOUT = 1.5VP-P and fIN = 5MHz

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

VOUT = 1.5VP-P and fIN = 5MHz

♦ 120mW Consumption Per Channel

*See the Ultrasound-Specific IMD3 Specification in the

Applications Information section.

VG_CTL+

VG_CTL-

VG_IN1+

VG_IN1-

•

•

•

VG_IN8+

VG_IN8-

PD

Functional Diagram

VCC

VREF

MAX2037

-12.5dB TO +29.5dB

50Ω

VGA

50Ω

••

•

••

•

••

•

50Ω

VGA

50Ω

BIAS

CIRCUITRY

VG_CLAMP_MODE

VG_OUT1+

VG_OUT1-

•

•

•

VG_OUT8+

VG_OUT8-

GND

EXT_RES

Ordering Information

PART

TEMP

RANGE

PIN-PACKAGE PKG

CODE

MAX2037CCQ-D

0°C to +70°C

100 TQFP-EP†

(14mm x 14mm)

C100E-3

MAX2037CCQ-TD 0°C to +70°C 100 TQFP-EP† C100E-3

(14mm x 14mm)

MAX2037CCQ+D 0°C to +70°C 100 TQFP-EP† C100E-3

(14mm x 14mm)

MAX2037CCQ+TD 0°C to +70°C 100 TQFP-EP† C100E-3

(14mm x 14mm)

†EP = Exposed paddle.

+Denotes lead-free package.

T = Tape-and-reel package.

D = Dry packing.

________________________________________________________________ Maxim Integrated Products 1

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.

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