MAX5407 Datasheet, PDF (1/7 Pages) Maxim Integrated Products – 32-Tap Audio Logarithmic Taper Digital Potentiometer

19-2196; Rev 0; 10/01
32-Tap Audio Logarithmic Taper
Digital Potentiometer
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.
Features
o Miniature 3mm x 3mm 8-Pin SOT23 Package
o Logarithmic Taper with 1dB Steps Between Taps
o 32 Tap Positions
o Low 0.35µA Supply Current
o +2.7V to +5.5V Single-Supply Operation
o Zero-Crossing Detection to Minimize Audible
Clicks During Wiper Transitions
o Simple Up/Down 2-Wire Serial Data Interface
o Power-On Reset
Wiper Goes To Maximum Attenuation
(Lowest Tap Position)
o 20kΩ End-to-End Resistance
Applications
Audio Volume Control
Fading/Balancing Audio Signals
Mechanical Potentiometer Replacement
Ordering Information
PART
MAX5407EKA
TEMP. RANGE
-40°C to +85°C
PIN-
PACKAGE
8 SOT23
TOP MARK
AAID
Functional Diagram
H
V_DD
GND
MAX5407
CS
U/D
UP/DOWN
COUNTER
32-POSITION
DECODER
W
ZCEN
Pin Configuration
TOP VIEW
H1
GND 2
W3
L4
MAX5407
SOT23
8 ZCEN
7 V_DD
6 CS
5 U/D
L
SOT-PoT is a trademark of Maxim Integrated Products, Inc.
________________________________________________________________ Maxim Integrated Products 1
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.