Datasheet

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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

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.

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

DOUT V

LOGIC

GND

AGND

W1A

N.C. (W1B)

TOP VIEW

MAX5408-

MAX5411

QSOP

DIN

SCLK

W0A

N.C. (W0B)

16 15 14 13

DIN

DOUT

LOGIC

W0A

N.C. (W0B)

N.C. (W1B)

W1A

( ) ARE FOR MAX5409/MAX5411 ONLY

AGND

GND

SCLK

MAX5408-

MAX5411

THIN QFN

(4mm x 4mm)

(5mm x 6mm)

Ordering Information continued at end of data sheet.

Functional Diagram appears at end of data sheet.

SPI is a trademark of Motorola, Inc.

Summary of content (13 pages)

PAGE 1
9-2049; Rev 3; 1/05 Dual, Audio, Log Taper Digital Potentiometers 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.
PAGE 2
MAX5408–MAX5411 Dual, Audio, Log Taper Digital Potentiometers ABSOLUTE MAXIMUM RATINGS 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_....
PAGE 3
Dual, Audio, Log Taper Digital Potentiometers (VDD = +2.7V to +3.6V (MAX5408/MAX5409), VDD = +4.5V to +5.5V (MAX5410/MAX5411), VH_ = VDD, VL_ = 0, TA = TMIN to TMAX. Typical values are at TA = +25°C, unless otherwise specified.) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS DIGITAL OUTPUT Output High Voltage VOH ISOURCE = 0.5mA Output Low Voltage VOL ISINK = 2mA VLOGIC - 0.5 V 0.
PAGE 4
Typical Operating Characteristics (VDD = +3V (MAX5408/MAX5409), VDD = +5V (MAX5410/MAX5411), DOUT = floating) WIPER RESISTANCE vs. WIPER VOLTAGE END-TO-END RESISTANCE % CHANGE vs. TEMPERATURE 993 992 991 990 989 MAX5408-11 toc02 994 0.20 END-TO-END RESISTANCE CHANGE (%) TAP POSITION 31 995 WIPER RESISTANCE (Ω) MAX5408-11 toc01 996 0.15 0.10 0.05 0 -0.05 -0.10 -0.15 VDD = 5V = VLOGIC, L_ = GND -0.20 988 -40 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.
PAGE 5
Dual, Audio, Log Taper Digital Potentiometers LOGIC CURRENT vs. LOGIC VOLTAGE ACTIVE MODE SCLK = 2MHz, O to VLOGIC 40 0.50 ZERO-CROSSING DETECTION DISABLED 0.45 35 0.40 30 0.35 IDD (µA) LOGIC SUPPLY CURRENT (µA) 45 0.55 MAX5408-11 toc07 50 25 20 0.30 MAX5408-11 toc08 SUPPLY CURRENT vs. SUPPLY VOLTAGE ACTIVE 0.25 0.20 15 STANDBY 0.15 10 0.10 5 0.05 0 0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 2.5 LOGIC SUPPLY VOLTAGE (V) 3.0 3.5 4.0 4.5 5.0 5.
PAGE 6
MAX5408–MAX5411 Dual, Audio, Log Taper Digital Potentiometers Table 1.
PAGE 7
Dual, Audio, Log Taper Digital Potentiometers MAX5408–MAX5411 Table 2.
PAGE 8
MAX5408–MAX5411 Dual, Audio, Log Taper Digital Potentiometers Table 5. Zero-Crossing Detection Register Bit Definitions for MAX5408/MAX5410 DATA BIT D4 D3 VALUE FUNCTION 0 Disable wiper W0A zero-crossing detection circuit 1 Enable wiper W0A zero-crossing detection circuit “don’t care” D2 No change 0 Disable wiper W1A zero-crossing detection circuit 1 Enable wiper W1A zero-crossing detection circuit D1 “don’t care” No change D0 “don’t care” No change Table 6.
PAGE 9
Dual, Audio, Log Taper Digital Potentiometers V H_ V L_ V L_ -10dB WIPER POSITION t=0 MAX5408–MAX5411 V H_ -10dB -20dB -20dB WIPER POSITION 50ms (TYP) t=0 100ms 50ms (TYP) 100ms CHANGING WIPER POSITIONS WITH ZERO-CROSSING ENABLED, COMMAND ISSUED AT t = 0 Figure 2. Zero-Crossing Timing Diagram VOUT0 VIN0 VIN1 H0 H1 W0A W1A MAX5408– MAX5411 VOUT1 L1 L0 Figure 3.
PAGE 10
MAX5408–MAX5411 Dual, Audio, Log Taper Digital Potentiometers SCLK H1 H0 SCLK SCLK VIN0 SCLK VOUT0 SDIN SDIN CS DOUT MAX5408– MAX5411 SDIN CS DOUT SDIN MAX5408– MAX5411 CS VIN1 W0A MAX5408– MAX541 W1A MAX5408– MAX5411 DOUT VOUT1 L1 L0 CS Figure 5. Daisy-Chaining of Serial Interfaces circuit (see Figure 2). With zero-crossing enabled, the MAX5408–MAX5411 change wiper position after 50ms or when zero crossing is detected.
PAGE 11
Dual, Audio, Log Taper Digital Potentiometers W0A H0 N.C. (W0B) DOUT W1A H1 N.C.
PAGE 12
Package Information (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information, go to www.maxim-ic.com/packages.) 24L QFN THIN.EPS MAX5408–MAX5411 Dual, Audio, Log Taper Digital Potentiometers PACKAGE OUTLINE 12, 16, 20, 24L THIN QFN, 4x4x0.8mm 21-0139 C 1 2 PACKAGE OUTLINE 12, 16, 20, 24L THIN QFN, 4x4x0.
PAGE 13
Dual, Audio, Log Taper Digital Potentiometers QSOP.EPS PACKAGE OUTLINE, QSOP .150", .025" LEAD PITCH 21-0055 E 1 1 Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.