MAX5408 Datasheet, PDF (1/13 Pages) Maxim Integrated Products – Dual, Audio, Log Taper Digital Potentiometers

19-2049; Rev 2; 9/02
Dual, Audio, Log Taper Digital Potentiometers
General Description
The MAX5408–MAX5411 dual, logarithmic taper digital
potentiometers, with 32-tap points each, replace
mechanical potentiometers in audio applications requir-
ing digitally controlled resistors. The MAX5408/
MAX5410 are dual potentiometers with one wiper per
potentiometer. The MAX5409/MAX5411 are dual poten-
tiometers with two wipers per potentiometer (see
Functional Diagram). An SPI™-compatible serial inter-
face controls the wiper positions. The MAX5408–
MAX5411 have a factory-set resistance of 10kΩ per
potentiometer. A zero-crossing detect feature mini-
mizes the audible noise generated by wiper transitions.
The MAX5408–MAX5411 have nominal temperature
coefficients of 35ppm/°C end-to-end and 5ppm/°C
ratiometric. The MAX5408–MAX5411 are available in
16-pin QSOP and 16-pin thin QFN packages and are
specified over the extended temperature range (-40°C
to +85°C).
Applications
Stereo Volume Control
Fading and Balancing Stereo Signals
Mechanical Potentiometer Replacement
Functional Diagram appears at end of data sheet.
SPI is a trademark of Motorola, Inc.
Features
o Log Taper with 2dB Steps Between Taps
o 32-Tap Positions for Each Wiper
o Small 16-Pin QSOP/QFN Packages
o Single-Supply Voltage Operation
+2.7V to +3.6V (MAX5408/MAX5409)
+4.5V to +5.5V (MAX5410/MAX5411)
o Low 0.5µA Standby Supply Current
o Zero-Crossing Detection for Clickless Switching
o Mute Function to -90dB
o 10kΩ Fixed Resistance Value
o 3-Wire SPI-Compatible Serial Data Interface
o Power-On Reset: Wiper Goes to Maximum
Attenuation
o Digital Output for Readback and Daisy-Chaining
Capabilities
Ordering Information
PART
TEMP RANGE
PIN-
PACKAGE
WIPERS PER
RESISTOR
MAX5408EEE -40°C to +85°C 16 QSOP
1
MAX5408ETE -40°C to +85°C 16 Thin QFN
1
MAX5409EEE -40°C to +85°C 16 QSOP
2
Ordering Information continued at end of data sheet.
Pin Configurations
TOP VIEW
DOUT 1
DIN 2
SCLK 3
CS 4
H0 5
L0 6
W0A 7
N.C. (W0B) 8
MAX5408-
MAX5411
QSOP
(5mm x 6mm)
16 V_DD
15 V_LOGIC
14 GND
13 AGND
12 H1
11 L1
10 W1A
9 N.C. (W1B)
SCLK 1
CS 2
H0 3
L0 4
( ) ARE FOR MAX5409/MAX5411 ONLY
DIN
DOUT
V_DD
V_LOGIC
16
15
14
13
12 GND
MAX5408-
MAX5411
11 AGND
10 H1
9 L1
5
6
7
8
W0A N.C. (W0B) N.C. (W1B) W1A
THIN QFN
(4mm x 4mm)
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