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SPI-Programmable Gain Amplifier (PGA) with Input VOS Trim and Output Op Amp

Programmable Gain Amplifier with SPI Interface Suitable for a Wide Range of Applications

Product Details

Key Features

Parametric specs for Programmable Gain Amplifiers
Interface Type SPI
AV (V/V) 0.2 to 157
Gain Error (%) (max) 0.38
Gain Temp.- Coeff. (ppm/°C) (max) 17
VSUPPLY (V) (min) 2.9
VSUPPLY (V) (max) 5.5
Shutdown Mode Supply Current (µA) (typ) 13
Shutdown Mode Supply Current (µA) (max) 24
Supply Current (µA) (typ) 3400
Supply Current (µA) (max) 6700
Gain-BW Product (MHz) 2.15 to 279
Oper. Temp. (°C) -40 to +125
Package/Pins UMAX/10
Budgetary
Price (See Notes)
1.29
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Simplified Block Diagram

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Parameters

Parametric specs for Programmable Gain Amplifiers
Interface Type SPI
AV (V/V) 0.2 to 157
Gain Error (%) (max) 0.38
Gain Temp.- Coeff. (ppm/°C) (max) 17
VSUPPLY (V) (min) 2.9
VSUPPLY (V) (max) 5.5
Shutdown Mode Supply Current (µA) (typ) 13
Shutdown Mode Supply Current (µA) (max) 24
Supply Current (µA) (typ) 3400
Supply Current (µA) (max) 6700
Gain-BW Product (MHz) 2.15 to 279
Oper. Temp. (°C) -40 to +125
Package/Pins UMAX/10
Budgetary
Price (See Notes)
1.29

Key Features

  • SPI-Programmable Gains: 0.2V/V to 157V/V
  • Extremely Low Gain Tempco
  • Integrated Amplifier for R/C Programmable Active Filter
  • Input Offset-Voltage Compensation
  • Input Protection to ±16V
  • 13µA Software Shutdown Mode
  • -40°C to +125°C Operating Temperature Range
  • 10-Pin µMAX Package

Applications/Uses

  • Amplification
  • Differential to Single-Ended Conversion
  • Differential-Input, Differential-Output Signal
  • Medical Signal Conditioning
  • Sensor Interface and Signal Processing
  • Sensorless Motor Control
  • Sonar and General Purpose Data Acquisition

Description

The MAX9939 is a general-purpose, differential-input programmable-gain amplifier (PGA) that is ideal for conditioning a variety of wide dynamic range signals such as those found in motor current-sense, medical instrumentation, and sonar data acquisition applications. It features SPI-programmable differential gains from 0.2V/V to 157V/V, input offset-voltage compensation, and an output amplifier that can be configured either as a high-order active filter or to provide a differential output.

The PGA is optimized for high-signal bandwidth and its gain can be programmed to be 0.2V/V, 1V/V, 10V/V, 20V/V, 30V/V, 40V/V, 60V/V, 80V/V, 119V/V, and 157V/V. Precision resistor matching provides extremely low gain tempco and high CMRR. Although the MAX9939 operates from a single supply VCC between 2.9V to 5.5V, it can process signals both above and below ground due to the use of an input level-shifting amplifier stage. Furthermore, its inputs are protected to ±16V, allowing it to withstand fault conditions and signal overranges.

The output amplifier is designed for high bandwidth and low-bias currents, making it ideal for use in multiple-feedback active filter topologies that offer much higher Qs and stopband attenuation than Sallen-Key architectures.

The MAX9939 draws 3.4mA of quiescent supply current at 5V, and includes a software-programmable shutdown mode that reduces its supply current to only 13µA. The MAX9939 is available in a 10-pin µMAX® package and operates over the -40°C to +125°C automotive temperature range.

Simplified Block Diagram

MAX9939: Functional Diagram MAX9939: Functional Diagram Zoom icon

Technical Docs

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .