MAX5440

Stereo Volume Control with Rotary Encoder Interface

Rotary Encoder Interface Uses Gray Scale Encoding to Control Volume and Balance in Audio Applications
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Status Explanations for product status codes

Active: In Production.

Description

The MAX5440 dual, 40kΩ logarithmic taper volume control features a debounced up/down interface for use with a simple rotary encoder without using a microcontroller (µC). Each potentiometer has 32 log-spaced tap points with a buffered wiper output and replaces mechanical potentiometers. An integrated bias generator provides the required ((VDD + VSS) / 2) bias voltage, eliminating the need for costly external op-amp circuits in unipolar audio applications. A mode-indicator LED output specifies volume or balance control. Five integrated LED drivers indicate volume level or balance settings, depending on the status of the mode indicator.

The MAX5440 includes debounced pushbutton inputs for mute and mode. The mute input allows a single pushbutton to change between volume control and the -90dB (typ) mute setting. The mode input toggles between volume and balance control. A click-and-pop suppression feature minimizes the audible noise generated by wiper transitions. The MAX5440 provides a nominal temperature coefficient of 35ppm/°C end-to-end and 5ppm/°C, ratiometrically. The MAX5440 is available in a 24-pin SSOP package and is specified for operation over the -40°C to +85°C extended temperature range.

Data Sheet

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Key Features

  • Logarithmic Taper Volume Control with (31) 2dB Steps
  • Low-Power Wiper Buffers Provide 0.003% THD
  • Single +2.7V to +5.5V or Dual ±2.7V Supply Voltage Operation
  • Low 0.5µA Shutdown Supply Current
  • Integrated Bias Voltage Generator
  • Five-Segment LED Volume/Balance Indicator
  • Clickless Switching
  • 40kΩ End-to-End Fixed Resistance Value
  • Mute Function Toggles to -90dB (typ)
  • Power-On Reset to -12dBFS Wiper Position
 

Applications/Uses

  • Automotive Back-Seat Multimedia
  • Desktop Speakers
  • Multimedia Docking Stations
  • Set-Top Boxes
  • Stereo Volume Control
   

Key Specifications:

Digital Potentiometers
Part Number Taper POTs Control Interface Wiper Memory Steps REND-TO-END
(kΩ)
Res. Tol.
(%)
Temp. Coeff.
(ppm/°C)
Wiper Resistance
(Ω)
ICC @5V
(µA)
Budgetary
Price
typ typ max See Notes
MAX5440  Log 2 Rotary Encoder Volatile 32 40 30 35 1 1.4 $1.54 @1k
See All Digital Potentiometers (128)

Pricing Notes:

This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.



Diagram

MAX5440: Typical Operating Circuit
Typical Operating Circuit

Technical Documents

Product Guide 5159  Audio
Tutorial 4262  Improve Stereo Performance with Active Biasing

Product Guides

Audio (PDF)
Signal Chain (PDF)

Reliability Reports

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Ordering Information

Filters: Part Number Package: Temperature: Tape and Reel Sample
Part Number Free
Sample
Buy Status Explanations for product status codes Package:
TYPE PINS FOOTPRINT
DRAWING  CODE/VAR *
Temp RoHS/Lead-Free?
Materials Analysis
MAX5440EAG+  
Active SSOP;24 pin;65.8 mm²
-40°C to +85°C RoHS/Lead-Free: Lead Free
Materials Analysis
MAX5440EAG+T    
Active SSOP;24 pin
-40°C to +85°C See data sheet

Notes:
  1. Other options and links for purchasing parts are listed at: http://www.maximintegrated.com/sales.
  2. Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day.
  3. Part number suffixes: T or T&R = tape and reel; + = RoHS/lead-free; # = RoHS/lead-exempt; -D = drypack; -U/+U on DS parts = cut tape. More: See Full Data Sheet or Maxim Product Naming Conventions.
  4. * 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.

Similar Products by Function

MAX5456, MAX5457 Stereo Audio Taper Potentiometers with Pushbutton Interface
MAX5406 Audio Processor with Pushbutton Interface
MAX5407 32-Tap Audio Logarithmic Taper Digital Potentiometer
MAX5408, MAX5409, MAX5410, ... Dual, Audio, Log Taper Digital Potentiometers
See All Digital Potentiometers (128Products)

More Information

New Product Press Release   2006-05-03 ]

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Information Index

Overview

 

Design Resources

 

Ordering Info

 

Related Products

 
Description
Key Features
Applications/Uses
Key Specifications
Diagram
Notes and Comments
  Data Sheet
Technical Documents
Evaluation Kits
Reliability Reports
Software/Models
  Price and Availability
Samples
Buy Online
Package Information
Lead-Free Information
  Similar Products by Function
Similar Products by Application
Evaluation Kits
Products with Similar Part Numbers
Products Used With This
 
Document Ref.: 19-0542 Rev 2; 2008-12-01
This page last modified: 2008-12-01