Datasheet

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General 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 applica-

tions, 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.

Applications

Audio Volume Control

Fading/Balancing Audio Signals

Mechanical Potentiometer Replacement

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

MAX5407

32-Tap Audio Logarithmic Taper

Digital Potentiometer

________________________________________________________________ Maxim Integrated Products 1

TOP VIEW

ZCEN

U/DL

GND

MAX5407

SOT23

Pin Configuration

Ordering Information

UP/DOWN

COUNTER

GND

U/D

ZCEN

32-POSITION

DECODER

MAX5407

Functional Diagram

19-2196; Rev 0; 10/01

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.

PART TEMP. RANGE

PIN-

PACKAGE

TOP MARK

MAX5407EKA -40°C to +85°C 8 SOT23 AAID

SOT-PoT is a trademark of Maxim Integrated Products, Inc.

Summary of content (7 pages)

PAGE 1
9-2196; Rev 0; 10/01 32-Tap Audio Logarithmic Taper Digital Potentiometer 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.
PAGE 2
MAX5407 32-Tap Audio Logarithmic Taper Digital Potentiometer ABSOLUTE MAXIMUM RATINGS VDD to GND ..............................................................-0.3V to +6V H, W, L, CS, ZCEN, and U/D to GND .........-0.3V to (VDD + 0.3V) Input and Output Latchup Immunity...............................±200mA Maximum Continuous Current into H, L, and W ..............±500µA Continuous Power Dissipation (TA = +70°C) 8-Pin SOT23-8 (derate 8.9mW/°C above +70°C) ......714mW Operating Temperature Range ...........
PAGE 3
2-Tap Audio Logarithmic Taper Digital Potentiometer (VDD = +2.7V to +5.5V, VH = VDD, VL = 0, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VDD = +5V and TA = +25°C.) (Note 1) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS 5.5 V POWER SUPPLIES Supply Voltage VDD Supply Current Note 1: Note 2: Note 3: Note 4: Note 5: Note 6: Note 7: Note 8: 2.7 All digital inputs are set to 0 IDD Active (Note 7) 100 Standby (Note 8) 0.
PAGE 4
Typical Operating Characteristics (continued) (VDD = +5V, TA = +25°C, unless otherwise noted.) 0.40 VDD = +5V 0.35 U/D 2V/div 0.30 0.25 0.20 VDD = +3V 0.15 OUTPUT W 200mV/div 0.10 0.40 MAX5407 toc06 0.45 STANDBY SUPPLY CURRENT (µA) MAX5407 toc04 0.50 STANDBY SUPPLY CURRENT vs. SUPPLY VOLTAGE TAP-TO-TAP SWITCHING TRANSIENT MAX5407 toc05 SUPPLY CURRENT vs. TEMPERATURE 0.35 0.30 0.25 0.20 0.15 0.10 0.05 0.05 0 0 -40 -15 10 35 60 2.5 40ns/div 85 3.0 3.5 4.0 4.5 5.0 5.
PAGE 5
32-Tap Audio Logarithmic Taper Digital Potentiometer MAX5407 CS tCU tIC tIL U/D tIH tCI tIW W NOTE: W IS NOT A DIGITAL SIGNAL. IT REPRESENTS THE WIPER TRANSITIONING. Figure 1. Serial Interface Timing Diagram, Increment Mode CS tCU tIC tIH U/D tCI tIL W tIW NOTE: W IS NOT A DIGITAL SIGNAL. IT REPRESENTS THE WIPER TRANSITIONING. Figure 2.
PAGE 6
MAX5407 32-Tap Audio Logarithmic Taper Digital Potentiometer Power-On Reset The power-on reset feature sets the wiper to the maximum attenuation (tap position 31, -31dB) at power-up. If CS is initially high, the MAX5407 is in the increment mode by default. Zero-Crossing Detection When the ZCEN input is low, the zero-crossing detect feature is enabled. This feature reduces the audible noise (“clicks and pops”) that result from wiper transitions.
PAGE 7
32-Tap Audio Logarithmic Taper Digital Potentiometer SOT23, 8L.EPS Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.