Datasheet
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
1
2
3
4
8
7
6
5
ZCEN
V
DD
CS
U/DL
W
GND
H
MAX5407
SOT23
Pin Configuration
Ordering Information
UP/DOWN
COUNTER
V
DD
GND
CS
H
L
W
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.