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MAX5408EEE-MAX5410ETE
Dual / Audio / Log Taper Digital Potentiometers
General DescriptionThe 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 10kΩper
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).
ApplicationsStereo Volume Control
Fading and Balancing Stereo Signals
Mechanical Potentiometer Replacement
FeaturesLog Taper with 2dB Steps Between Taps32-Tap Positions for Each WiperSmall 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 CurrentZero-Crossing Detection for Clickless SwitchingMute Function to -90dB10kΩFixed Resistance Value3-Wire SPI-Compatible Serial Data InterfacePower-On Reset: Wiper Goes to Maximum
AttenuationDigital Output for Readback and Daisy-Chaining
Capabilities
MAX5408–MAX5411
Dual, Audio, Log Taper Digital Potentiometers
Pin Configurations19-2049; Rev 2; 9/02
Ordering Information continued at end of data sheet.
Functional Diagram appears at end of data sheet.SPI is a trademark of Motorola, Inc.
VDD, VLOGIC, CS, SCLK, DIN to GND......................-0.3V to +6V
H_, L_, and W_ to GND..............................-0.3V to (VDD+ 0.3V)
DOUT to GND.............................................-0.3V to (VDD+ 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 (TA= +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
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= TMINto TMAX.
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.
MAX5408–MAX5411
Dual, Audio, Log Taper Digital Potentiometers
ELECTRICAL CHARACTERISTICS (continued)(VDD= +2.7V to +3.6V (MAX5408/MAX5409), VDD= +4.5V to +5.5V (MAX5410/MAX5411), VH_= VDD, VL_= 0, TA= TMINto TMAX.
Typical values are at TA= +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.
MAX5408–MAX5411
Dual, Audio, Log Taper Digital Potentiometers
Typical Operating Characteristics(VDD= +3V (MAX5408/MAX5409), VDD= +5V (MAX5410/MAX5411), DOUT = floating)
MAX5408–MAX5411
Dual, Audio, Log Taper Digital Potentiometersypical Operating Characteristics (continued)(VDD= +3V (MAX5408/MAX5409), VDD= +5V (MAX5410/MAX5411), DOUT = floating)
Pin Description
MAX5408–MAX5411
Dual, Audio, Log Taper Digital Potentiometers
Detailed Description
Digital Serial Interface An SPI-compatible serial interface controls the
MAX5408–MAX5411. The input word to the device is
eight bits long, composed of three address bits (A0,
A1, and A2), followed by five data bits, with MSB first
(see Tables 1 and 2). The first three address bits set
the value of internal registers. The five data bits control
the wiper position. For certain commands, some of the
five data bits are “don’t cares”, but must be sent to the
device.
The serial data is listed in Tables 1 and 2.
The control code determines:Potentiometer to update or register to set.Data for mute register (Tables 3 and 4).Data for zero-crossing detection register (Tables 5
and 6).
The data bits control the position of the wiper (Table 7).
A logic low on the chip-select input (CS) enables the
device’s serial interface. A logic high on CSdisables
the interface control circuitry. See Figure 1 for serial-
interface timing description.
Table 1. Serial Interface Programming Commands for MAX5408/MAX5410
MAX5408–MAX5411
Dual, Audio, Log Taper Digital Potentiometers
Table 2. Serial Interface Programming Commands for MAX5409/MAX5411
Table 3. Mute Register Bit Definitions for MAX5408/MAX5410
Table 4. Mute Register Bit Definitions for MAX5409/MAX5411
