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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).
♦
32-Tap Positions for Each Wiper
♦
Small 16-Pin QSOP/QFN Packages
♦
Single-Supply Voltage Operation
+2.7V to +3.6V (MAX5408/MAX5409)
+4.5V to +5.5V (MAX5410/MAX5411)
♦
Low 0.5µA Standby Supply Current
♦
Zero-Crossing Detection for Clickless Switching
♦
Mute Function to -90dB
♦
10kΩ Fixed Resistance Value
♦
3-Wire SPI-Compatible Serial Data Interface
♦
Power-On Reset: Wiper Goes to Maximum
Attenuation
♦
Digital Output for Readback and Daisy-Chaining
Capabilities
Features
♦
Log Taper with 2dB Steps Between Taps
MAX5408–MAX5411
Applications
Stereo Volume Control
Fading and Balancing Stereo Signals
Mechanical Potentiometer Replacement
Ordering Information
PART
TEMP RANGE
PIN-
PACKAGE
WIPERS PER
RESISTOR
1
1
2
MAX5408EEE
-40°C to +85°C 16 QSOP
MAX5408ETE
-40°C to +85°C 16 Thin QFN
Functional Diagram appears at end of data sheet.
SPI is a trademark of Motorola, Inc.
MAX5409EEE
-40°C to +85°C 16 QSOP
Ordering Information continued at end of data sheet.
Pin Configurations
TOP VIEW
DIN
16
DOUT 1
DIN 2
SCLK 3
CS 4
H0 5
L0 6
W0A 7
N.C. (W0B) 8
16 V
DD
15 V
LOGIC
14 GND
DOUT
V
DD
V
LOGIC
15
14
13
SCLK
1
12
GND
MAX5408-
MAX5411
13 AGND
12 H1
11 L1
10 W1A
9
N.C. (W1B)
CS
2
11
AGND
MAX5408-
MAX5411
H0
3
10
H1
L0
4
5
9
L1
QSOP
(5mm x 6mm)
( ) ARE FOR MAX5409/MAX5411 ONLY
6
7
8
W1A
W0A
N.C. (W0B)
N.C. (W1B)
THIN QFN
(4mm x 4mm)
________________________________________________________________
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.
Dual, Audio, Log Taper Digital Potentiometers
MAX5408–MAX5411
ABSOLUTE MAXIMUM RATINGS
V
DD
, V
LOGIC
,
CS,
SCLK, DIN to GND ......................-0.3V to +6V
H_, L_, and W_ to GND ..............................-0.3V to (V
DD
+ 0.3V)
DOUT to GND.............................................-0.3V to (V
DD
+ 0.3V)
AGND to GND .......................................................-0.3V to +0.3V
Input and Output Latchup Immunity...............................±200mA
Maximum Continuous Current into H_, L_, and W_.........±500µA
Continuous Power Dissipation (T
A
= +70°C)
16-Pin QSOP (derate 8.3mW/°C above +70°C)........666.7mW
16-Pin QFN (derate 18.5mW/°C above +70°C) .........1481mW
Operating Temperature Range ...........................-40°C to +85°C
Storage Temperature Range .............................-60°C to +150°C
Maximum Junction Temperature .....................................+150°C
Lead Temperature (soldering, 10s) .................................+300°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(V
DD
= +2.7V to +3.6V (MAX5408/MAX5409), V
DD
= +4.5V to +5.5V (MAX5410/MAX5411), V
H_
= V
DD
, V
L_
= 0, T
A
= T
MIN
to T
MAX
.
Typical values are at T
A
= +25°C, unless otherwise specified.)
PARAMETER
End-to-End Resistance
Maximum Bandwidth
Absolute Tolerance
Tap-to-Tap Tolerance
Total Harmonic Distortion + Noise
Channel Isolation
Interchannel Matching
Mute Attenuation
Power-Supply Rejection Ratio
Wiper Resistance
Wiper Capacitance
Digital Clock Feedthrough
End-to-End Resistance
Temperature Coefficient
Ratiometric Resistance
Temperature Coefficient
DIGITAL INPUTS (V
LOGIC
> 4.5V)
Input High Voltage
Input Low Voltage
Input Leakage Current
Input Capacitance
DIGITAL INPUTS (V
LOGIC
< 4.5V)
Input High Voltage
Input Low Voltage
Input Leakage Current
Input Capacitance
5
V
IH
V
IL
0.7 x
V
LOGIC
0. 3 x
V
LOGIC
±1
V
V
µA
pF
5
V
IH
V
IL
2.4
0.8
±1
V
V
µA
pF
PSRR
R
W
C
W
f
SCLK
= 20Hz to 20kHz, tap = -6dB
f = 20Hz to 20kHz, tap = -6dB
THD+N
V
IN
= 1V
RMS
, f = 1kHz, tap = -6dB
(Note 1) C
W_
= 50pF
SYMBOL
CONDITIONS
MIN
7
100
±0.25
±0.1
0.002
-100
±0.5
-90
-80
1000
10
-90
35
5
1700
TYP
10
MAX
13
UNITS
kΩ
kHz
dB
dB
%
dB
dB
dB
dB
Ω
pF
dB
ppm/°C
ppm/°C
2
_______________________________________________________________________________________
Dual, Audio, Log Taper Digital Potentiometers
ELECTRICAL CHARACTERISTICS (continued)
(V
DD
= +2.7V to +3.6V (MAX5408/MAX5409), V
DD
= +4.5V to +5.5V (MAX5410/MAX5411), V
H_
= V
DD
, V
L_
= 0, T
A
= T
MIN
to T
MAX
.
Typical values are at T
A
= +25°C, unless otherwise specified.)
PARAMETER
DIGITAL OUTPUT
Output High Voltage
Output Low Voltage
SCLK Clock Period
SCLK Pulse Width High
SCLK Pulse Width Low
CS
Fall to SCLK Rise Setup
Time
SCLK Rise to
CS
Rise Hold Time
DIN Setup Time
DIN Hold Time
SCLK Fall to DOUT Valid
Propagation Delay
CS
Rise to SCLK Rise Hold Time
CS
Pulse Width High
Wiper Settling Time
POWER SUPPLIES
Supply Voltage
Active Supply Current
Standby Supply Current
Logic Supply Voltage
Logic Active Supply Current
Logic Standby Supply Current
V
DD
I
DD
V
LOGIC
I
LOGIC
f
SCLK
= 2MHz, DOUT = floating (Note 2)
DOUT = floating (Note 3)
0.5
MAX5408/MAX5409
MAX5410/MAX5411
f
SCLK
= 2MHz (Note 2)
(Note 3)
2.7
0.2
2.7
4.5
3.6
5.5
100
10
5.5
120
10
V
µA
V
µA
V
OH
V
OL
t
CP
t
CH
t
CL
t
CSS
t
CSH
t
DS
t
DH
t
DO
t
CS1
t
CSW
t
IW
Zero-crossing detect disabled
C
LOAD
= 200pF
40
100
1
I
SOURCE
= 0.5mA
I
SINK
= 2mA
100
40
40
40
0
40
0
80
V
LOGIC
- 0.5
0.4
V
V
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
µs
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
MAX5408–MAX5411
TIMING CHARACTERISTICS
(Figure 1)
Note 1:
Guaranteed by design, not production tested.
Note 2:
Supply current measured while changing wiper position with zero crossing enabled.
Note 3:
Supply current measured while wiper position is fixed.
_______________________________________________________________________________________
3
Dual, Audio, Log Taper Digital Potentiometers
MAX5408–MAX5411
Typical Operating Characteristics
(V
DD
= +3V (MAX5408/MAX5409), V
DD
= +5V (MAX5410/MAX5411), DOUT = floating)
WIPER RESISTANCE vs.
WIPER VOLTAGE
MAX5408-11 toc01
END-TO-END RESISTANCE % CHANGE
vs. TEMPERATURE
END-TO-END RESISTANCE CHANGE (%)
0.15
0.10
0.05
0
-0.05
-0.10
-0.15
-0.20
-40
-15
10
35
60
85
MAX5408-11 toc02
996
995
WIPER RESISTANCE (Ω)
994
993
992
991
990
989
V
DD
= 5V = V
LOGIC
, L_ = GND
988
0
TAP POSITION 31
0.20
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
WIPER VOLTAGE (V)
TEMPERATURE (°C)
ATTENUATION vs. TAP POSITION
MAX5408-11 toc03
TOTAL SUPPLY CURRENT
VS.
TEMPERATURE
55
TOTAL SUPPLY CURRENT (µA)
50
45
40
35
30
25
20
ZERO-CROSSING ENABLED
I
TOTAL
= I
DD
+ I
LOGIC
ACTIVE MODE
MAX5408-11 toc04
0
-10
ATTENUATION (dB)
-20
-30
-40
-50
-60
-70
0
4
8
12
16
20
24
28
60
32
-40
-15
10
35
60
85
TAP POSITION
TEMPERATURE (°C)
TAP-TO-TAP SWITCHING TRANSIENT
(ZERO-CROSSING DISABLE)
MAX5408-11 toc05
LOGIC CURRENT
vs. LOGIC VOLTAGE
STANDBY MODE
SCLK = GND
MAX5408-11 toc06
0.30
LOGIC SUPPLY CURRENT (µA)
0.25
0.20
0.15
0.10
0.05
0
V
W_
2V/div
CS
2V/div
V
H
_ = 5V
V
L
_ = 0
4µs/div
2.5
3.0
3.5
4.0
4.5
5.0
5.5
LOGIC SUPPLY VOLTAGE (V)
4
_______________________________________________________________________________________
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