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Part: MAX5407EKA
Category:
Data Conversion
-> DAC (Digital to Analog Converters)
Description: MAX5407 32-Tap Audio Logarithmic Taper Digital Potentiometer
Company: Maxim Integrated Products
Datasheet: Download MAX5407EKA datasheet File size : 514 kB
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Datasheet text preview:
19-2196; Rev 0; 10/01
32-Tap Audio Logarithmic Taper Digital Potentiometer
General Description
The MAX5407 SOT-PoTTM is a logarithmic taper digital potentiometer with 32 tap points that has 1dB steps between taps. This device is ideal for audio applicat i o n s , such as volume control and fading/balancing audio signals. The MAX5407 consists of a resistor string and CMOS switches that are digitally controlled through a simple 2wire serial interface. This device performs the same function as a mechanical potentiometer. The device has a fixed end-to-end resistance of 20k and features zero-crossing detection to minimize the audible noise generated by the wiper transitions. This device has nominal resistor temperature coefficients of 35ppm/°C end-to-end and 5ppm/°C ratiometric. The MAX5407 is available in a space saving 8-pin SOT23 package and is guaranteed from -40°C to +85°C.
Features
o Miniature 3mm x 3mm 8-Pin SOT23 Package o Logarithmic Taper with 1dB Steps Between Taps o 32 Tap Positions o Low 0.35µA Supply Current o +2.7V to +5.5V Single-Supply Operation o Zero-Crossing Detection to Minimize Audible Clicks During Wiper Transitions o Simple Up/Down 2-Wire Serial Data Interface o Power-On Reset Wiper Goes To Maximum Attenuation (Lowest Tap Position) o 20k End-to-End Resistance
MAX5407
Applications
Audio Volume Control Fading/Balancing Audio Signals Mechanical Potentiometer Replacement
PART MAX5407EKA
Ordering Information
TEMP. RANGE -40°C to +85°C PINPACKAGE 8 SOT23 TOP MARK AAID
Functional Diagram
H VDD GND
Pin Configuration
TOP VIEW
H GND W L 1 2 3 4 8 ZCEN VDD CS U/D
MAX5407
MAX5407
7 6 5
CS U/D ZCEN
UP/DOWN COUNTER
32-POSITION DECODER
W
SOT23
L
SOT-PoT is a trademark of Maxim Integrated Products, Inc.
________________________________________________________________ Maxim Integrated Products
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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.
32-Tap Audio Logarithmic Taper Digital Potentiometer MAX5407
ABSOLUTE MAXIMUM RATINGS
VDD to GND .....-0.3V to +6V H, W, L, CS, ZCEN, and U/D to GND .........-0.3V to (VDD + 0.3V) Input and Output Latchup Immunity.......±200mA Maximum Continuous Current into H, L, and W .....±500µA Continuous Power Dissipation (TA = +70°C) 8-Pin SOT23-8 (derate 8.9mW/°C above +70°C) ......714mW Operating Temperature Range ...-40°C to +85°C Junction Temperature ......+150°C Storage Temperature Range .....-65°C to +150°C Soldering 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
(VDD = +2.7V to +5.5V, VH = VDD, VL = 0, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VDD = +5V and TA = +25°C.) (Note 1)
PARAMETER Number of Resistor Taps End-to-End Resistance Bandwidth (Note 2) Absolute Tolerance (Note 5) Tap-to-Tap Tolerance (Note 6) Total Harmonic Distortion + Noise Power-Supply Rejection Ratio End-to-End Resistance Temperature Coefficient Ratiometric Resistance Temperature Coefficient Wiper Resistance DIGITAL INPUTS Input High Voltage Input Low Voltage Input Leakage Current Input Capacitance TIMING CHARACTERISTICS (Figures 1, 2) U/D Mode to CS Setup CS to U/D Step Setup CS to U/D Step Hold U/D Step Low Period U/D Step High Period Up/Down Toggle Rate Wiper Switching Time Zero-Crossing Timeout tCU tCI tIC tIL tIH fTOGGLE tIW Zero-crossing detection disabled (Note 4) 0.1 50 25 25 25 25 25 7 ns ns ns ns ns MHz µs ms 5 VIH VIL 2.4 0.8 ±1 V V µA pF THD + N PSRR TCR (Notes 3, 4) (Note 3) (Note 3) VIN = 1VRMS, f = 1kHz, Tap = -6dB (Notes 3, 4) SYMBOL CONDITIONS MIN 32 15 20 500 ±0.25 ±0.05 0.002 -80 35 5 RW VDD = 2.7V 400 1700 ±1 ±0.1 25 TYP MAX UNITS Taps k kHz dB dB % dB ppm/°C ppm/°C
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32-Tap Audio Logarithmic Taper Digital Potentiometer MAX5407
ELECTRICAL CHARACTERISTICS (continued)
(VDD = +2.7V to +5.5V, VH = VDD, VL = 0, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VDD = +5V and TA = +25°C.) (Note 1)
PARAMETER POWER SUPPLIES Supply Voltage Supply Current VDD IDD All digital inputs are set to 0 Active (Note 7) Standby (Note 8) 2.7 100 µA 0.35 1 5.5 V SYMBOL CONDITIONS MIN TYP MAX UNITS
Note 1: Note 2: Note 3: Note 4: Note 5: Note 6: Note 7: Note 8:
All devices are 100% production tested at TA = +25°C and guaranteed by design for TA = TMIN to TMAX. Bandwidth is measured from H to W at the -6dB wiper tap position (see Typical Operating Characteristics). These specifications are only valid for IW less than 100nA of continuous wiper current. Measured with 20pF load capacitor. Absolute tolerance is defined as the variation of the attenuation for any given tap from its expected value. Tap-to-tap tolerance is defined as the variation between any two adjacent taps from the typical value of 1dB. Supply current when fTOGGLE = 2MHz. Supply current when wiper position is not changing.
Typical Operating Characteristics
(VDD = +5V, TA = +25°C, unless otherwise noted.)
WIPER RESISTANCE vs. WIPER VOLTAGE
MAX5407 toc01
END-TO-END RESISTANCE % CHANGE vs. TEMPERATURE
ENE-TO-END RESISTANCE CHANGE (%) 0.10 0.05 0 -0.05 -0.10 -0.15 -0.20 -0.25 -40 -15 10 35 60 85 ATTENUATION (dB)
MAX5407 toc02
ATTENUATION vs. TAP POSITION
MAX5407 toc03
350 VDD = +3V 300 WIPER RESISTANCE ()
0.15
0 -5 -10 -15 -20 -25 -30 -35 0 4 8 12 16 20 24 28
250
200 VDD = +5V
150
100 0 1 2 3 4 5 WIPER VOLTAGE (V)
32
TEMPERATURE (°C)
TAP POSITION
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