Data Converters
Digital Potentiometers
MAX5407

MAX5407

32-Tap Audio Logarithmic Taper Digital Potentiometer


Description

The MAX5407 SOT-PoT™ is a logarithmic taper digital potentiometer with 32 tap points that has 1dB steps between taps. This device is ideal for audio applications, such as volume control and fading/balancing audio signals.

The MAX5407 consists of a resistor string and CMOS switches that are digitally controlled through a simple 2-wire serial interface. This device performs the same function as a mechanical potentiometer. The device has a fixed end-to-end resistance of 20kΩ and features zero-crossing detection to minimize the audible noise generated by the wiper transitions.

This device has nominal resistor temperature coefficients of 35ppm/°C end-to-end and 5ppm/°C ratiometric. The MAX5407 is available in a space saving 8-pin SOT23 package and is guaranteed from -40°C to +85°C.
MAX5407: Functional Diagram MAX5407: Functional Diagram Enlarge++

Key Features

  • Miniature 3mm x 3mm 8-Pin SOT23 Package
  • Logarithmic Taper with 1dB Steps Between Taps
  • 32 Tap Positions
  • Low 0.35µA Supply Current
  • +2.7V to +5.5V Single-Supply Operation
  • Zero-Crossing Detection to Minimize Audible Clicks During Wiper Transitions
  • Simple Up/Down 2-Wire Serial Data Interface
  • Power-On Reset
    • Wiper Goes to Maximum Attenuation (Lowest Tap Position)
  • 20kΩ End-to-End Resistance

Applications/Uses

  • Audio Volume Control
  • Fading/Balancing Audio Signals
  • Mechanical Potentiometer Replacements
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
MAX5407  Log 1 Direction+Clock Volatile 32 20 25 35 400 0.35 $0.96 @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.

Technical Documents

Tutorial 4645 A Power Engineer: the Super Hero in a Design?
Tutorial 1828 Audio Gain Control Using Digital Potentiometers

Quality and Environmental Data

Product Reliability Reports: MAX5407.pdf 
Lead-Free Package Tin (Sn) Whisker Reports
 

Related Resources