MAXIM MAX5408, MAX5411 User Manual
General Description
The MAX5408–MAX5411 dual, logarithmic taper digital
potentiometers, with 32-tap points each, replace
mechanical potentiometers in audio applications requiring digitally controlled resistors. The MAX5408/
MAX5410 are dual potentiometers with one wiper per
potentiometer. The MAX5409/MAX5411 are dual potentiometers with two wipers per potentiometer (see
Functional Diagram). An SPI™-compatible serial interface controls the wiper positions. The MAX5408–
MAX5411 have a factory-set resistance of 10kΩ per
potentiometer. A zero-crossing detect feature minimizes 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
Features
♦ Log Taper with 2dB Steps Between Taps
♦ 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
MAX5408–MAX5411
Dual, Audio, Log Taper Digital Potentiometers
________________________________________________________________ Maxim Integrated Products 1
Pin Configurations
Ordering Information
19-2049; Rev 3; 1/05
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.
Ordering Information continued at end of data sheet.
Functional Diagram appears at end of data sheet.
SPI is a trademark of Motorola, Inc.
PART TEMP RANGE
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
PIN-
PACKAGE
WIPERS PER
RESISTOR
TOP VIEW
1
DOUT V
2
DIN
SCLK
3
MAX5408-
4
CS
H0
W0A
N.C. (W0B)
L0
5
6
7
8
MAX5411
QSOP
(5mm x 6mm)
16
15
14
13
12
11
10
9
DD
V
LOGIC
GND
AGND
H1
L1
W1A
N.C. (W1B)
( ) ARE FOR MAX5409/MAX5411 ONLY
SCLK
CS
H0
L0
DIN
16 15 14 13
1
2
3
4
5
N.C. (W0B)
W0A
DOUT
MAX5408-
MAX5411
6
N.C. (W1B)
THIN QFN
(4mm x 4mm)
V
V
DD
LOGIC
78
W1A
12
GND
11
AGND
10
H1
9
L1
VDD, 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
MAX5408–MAX5411
Dual, Audio, Log Taper Digital Potentiometers
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(VDD= +2.7V to +3.6V (MAX5408/MAX5409), VDD= +4.5V to +5.5V (MAX5410/MAX5411), VH_= VDD, VL_= 0, TA= T
MIN
to T
MAX
.
Typical values are at T
A
= +25°C, unless otherwise specified.)
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.
End-to-End Resistance 71013kΩ
Maximum Bandwidth (Note 1) CW_ = 50pF 100 kHz
Absolute Tolerance ±0.25 dB
Tap-to-Tap Tolerance ±0.1 dB
Total Harmonic Distortion + Noise THD+N VIN = 1V
Channel Isolation -100 dB
Interchannel Matching f = 20Hz to 20kHz, tap = -6dB ±0.5 dB
Mute Attenuation -90 dB
Power-Supply Rejection Ratio PSRR -80 dB
Wiper Resistance R
Wiper Capacitance C
Digital Clock Feedthrough f
End-to-End Resistance
Temperature Coefficient
Ratiometric Resistance
Temperature Coefficient
DIGITAL INPUTS (V
Input High Voltage V
Input Low Voltage V
Input Leakage Current ±1 µA
Input Capacitance 5pF
DIGITAL INPUTS (V
Input High Voltage V
Input Low Voltage V
Input Leakage Current ±1 µA
Input Capacitance 5pF
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
W
W
SCLK
> 4.5V)
LOGIC
IH
IL
< 4.5V)
LOGIC
IH
IL
, f = 1kHz, tap = -6dB 0.002 %
RMS
= 20Hz to 20kHz, tap = -6dB -90 dB
V
1000 1700 Ω
10 pF
35 ppm/°C
5 ppm/°C
2.4 V
0.8 V
0.7 x
LOGIC
0. 3 x
V
LOGIC
V
V
MAX5408–MAX5411
Dual, Audio, Log Taper Digital Potentiometers
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (continued)
(VDD= +2.7V to +3.6V (MAX5408/MAX5409), VDD= +4.5V to +5.5V (MAX5410/MAX5411), VH_= VDD, VL_= 0, TA= T
MIN
to T
MAX
.
Typical values are at T
A
= +25°C, unless otherwise specified.)
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.
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
DIGITAL OUTPUT
Output High Voltage V
Output Low Voltage V
TIMING CHARACTERISTICS (Figure 1)
SCLK Clock Period t
SCLK Pulse Width High t
SCLK Pulse Width Low t
CS Fall to SCLK Rise Setup
Time
SCLK Rise to CS Rise Hold Time t
DIN Setup Time t
DIN Hold Time t
SCLK Fall to DOUT Valid
Propagation Delay
CS Rise to SCLK Rise Hold Time t
CS Pulse Width High t
Wiper Settling Time t
POWER SUPPLIES
Supply Voltage V
Active Supply Current f
Standby Supply Current
Logic Supply Voltage V
Logic Active Supply Current f
Logic Standby Supply Current
OH
OL
CP
CH
CL
t
CSS
CSH
DS
DH
t
DO
CS1
CSW
IW
I
SOURCE
I
= 2mA 0.4 V
SINK
C
LOAD
Zero-crossing detect disabled 1 µs
MAX5408/MAX5409 2.7 3.6
DD
I
DD
LOGIC
I
LOGIC
MAX5410/MAX5411 4.5 5.5
SCLK
(Note 3) 0.2 10
= 2M H z, D OU T = fl oati ng ( N ote 2) 120
S C L K
DOUT = floating (Note 3) 0.5 10
V
= 0.5mA
LOGIC
- 0.5
100 ns
40 ns
40 ns
40 ns
0ns
40 ns
0ns
= 200pF 80 ns
40 ns
100 ns
= 2MHz (Note 2) 100
2.7 5.5 V
µA
µA
V
V
MAX5408–MAX5411
Dual, Audio, Log Taper Digital Potentiometers
4 _______________________________________________________________________________________
Typical Operating Characteristics
(VDD= +3V (MAX5408/MAX5409), VDD= +5V (MAX5410/MAX5411), DOUT = floating)
988
990
989
991
994
995
993
992
996
0 1.0 1.5 2.0 2.50.5 3.0 3.5 4.0 4.5 5.0
WIPER RESISTANCE vs.
WIPER VOLTAGE
MAX5408-11 toc01
WIPER VOLTAGE (V)
WIPER RESISTANCE (Ω)
TAP POSITION 31
VDD = 5V = V
LOGIC
, L_ = GND
-0.20
-0.15
-0.10
-0.05
0
0.05
0.10
0.15
0.20
-40 -15 10 35 60 85
END-TO-END RESISTANCE % CHANGE
vs. TEMPERATURE
MAX5408-11 toc02
TEMPERATURE (°C)
END-TO-END RESISTANCE CHANGE (%)
-70
-60
-40
-50
-20
-10
-30
0
081241620242832
ATTENUATION vs. TAP POSITION
MAX5408-11 toc03
TAP POSITION
ATTENUATION (dB)
20
25
30
35
40
45
50
55
60
-40 -15 10 35 60 85
TOTAL SUPPLY CURRENT
VS. TEMPERATURE
MAX5408-11 toc04
TEMPERATURE (°C)
TOTAL SUPPLY CURRENT (µA)
ZERO-CROSSING ENABLED
I
TOTAL
= I
DD
+ I
LOGIC
ACTIVE MODE
4µs/div
TAP-TO-TAP SWITCHING TRANSIENT
(ZERO-CROSSING DISABLE)
V
W_
2V/div
CS
2V/div
MAX5408-11 toc05
VH_ = 5V
V
L
_ = 0
0
0.10
0.05
0.20
0.15
0.25
0.30
2.5 3.5 4.03.0 4.5 5.0 5.5
LOGIC CURRENT
vs. LOGIC VOLTAGE
MAX5408-11 toc06
LOGIC SUPPLY VOLTAGE (V)
LOGIC SUPPLY CURRENT (µA)
STANDBY MODE
SCLK = GND
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