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Part: MAX5451
Category:
Analog & Mixed-Signal Processing
-> Potentiometers
Description: Dual, 256-Tap, Up/down Interface, Digital Potentiometers
Company: Maxim Integrated Products
Datasheet: Download MAX5451 datasheet File size : 217 kB
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Datasheet text preview:
19-1997; Rev 0; 4/01
Dual, 256-Tap, Up/Down Interface, Digital Potentiometers
General Description
The MAX5450MAX5455 are a family of dual digital potentiometers that perform the same function as a m e c h a n i c a l potentiometer or variable resistor. The M A X 5 4 5 1 / M A X 5 4 5 3 / M A X 5 4 5 5 have two 3-terminal potentiometers and the MAX5450/MAX5452/MAX5454 have two 2-terminal variable resistors. The MAX5450 MAX5455 operate from a +2.7V to +5.5V single-supply voltage and use an ultra-low supply current of 0.1µA. T h e s e devices consist of two fixed resistors each with 256 digitally-controlled wiper contacts. The convenient power-on reset (POR) sets the wiper to midscale position at power-up and the easy-to-use up/down interface allows glitchless switching between resistor taps. Six inputs control the 14-pin MAX5451/ MAX5453/MAX5455 potentiometers. Four inputs control the 10-pin MAX5450/MAX5452/MAX5454 variable resistors. The MAX5450MAX5455 are ideal for applications requiring digitally-controlled resistors. Three resistance values are available: 10k, 50k, and 100k. An endto-end resistor temperature coefficient of 35ppm/°C and a ratiometric temperature coefficient of 5ppm/°C m a k e the MAX5450MAX5455 excellent choices for adjustable gain circuit requiring low-temperature drift The MAX5450MAX5455 are available in 10-pin µMAX and 14-pin TSSOP packages. Each device is guaranteed over the extendedindustrial temperature range (-40°C to +85°C).
Features
o Small-Footprint Packages 10-Pin µMAX (MAX5450/MAX5452/MAX5454) 14-Pin TSSOP (MAX5451/MAX5453/MAX5455) o 256-Tap Positions o Independent Up/Down Potentiometer Controls (MAX5451/MAX5453/MAX5455) o Ultra-Low 0.1µA Supply Current o +2.7V to +5.5V Single-Supply Operation o Low 35ppm/°C End-to-End Temperature Coefficient o Power-On Reset Sets Wiper to Midscale (Position 127) o Glitchless Switching Between the Resistor Taps o 10k, 50k, 100k Resistance Values
MAX5450MAX5455
Ordering Information
PART MAX5450EUB MAX5451EUD MAX5452EUB MAX5453EUD MAX5454EUB MAX5455EUD TEMP. RANGE -40°C to +85°C -40°C to +85°C -40°C to +85°C -40°C to +85°C -40°C to +85°C -40°C to +85°C PINPACKAGE 10 µMAX 14 TSSOP 10 µMAX 14 TSSOP 10 µMAX 14 TSSOP R (k) 10 10 50 50 100 100
Applications
Mechanical Potentiometer Replacement Low-Drift Programmable-Gain Amplifier (PGA) Volume Control LCD Screen Adjustment Adjustable Voltage References Adjustable Linear Regulators Programmable Filters, Delays, Time Constants Impedance Matching
Pin Configurations
TOP VIEW
CS1 1 U/D VDD W1 L1 2 3 4 5
10 CS2 9 INC GND W2 L2
CS1 1 U/D1 U/D2 2 3
14 CS2 13 INC1 12 INC2
MAX5450 MAX5452 MAX5454
8 7 6
VDD 4 W1 5 H1 6 L1 7
MAX5451 MAX5453 MAX5455
11 GND 10 W2 9 8 H2 L2
µMAX
TSSOP
________________________________________________________________ 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.
Dual, 256-Tap, Up/Down Interface, Digital Potentiometers MAX5450MAX5455
ABSOLUTE MAXIMUM RATINGS
VDD to GND .....-0.3V to +6V CS_, INC_, and U/D_ to GND..-0.3V to +6V H_, L_, W_ to GND .....-0.3V to (VDD +0.3V) Maximum Continuous Current into H_, L_, and W_...±1mA Continuous Power Dissipation (TA = +70°C) 10-Pin µMAX (derate 6.94mW/°C above +70°C) ..........555mW 14-Pin TSSOP (derate 9.1mW/°C above +70°C) ..........727mW Operating Temperature Range ...-40°C to +85°C Junction Temperature ......+150°C Storage Temperature Range .....-65°C to +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
(VDD = +2.7V to +5.5V, VH = VDD, VL = 0; TA = TMIN to TMAX, unless otherwise noted. Typical values are at VDD = +5V, TA = +25°C, unless otherwise noted.)
PARAMETER Resolution Integral Nonlinearity (Notes 1 and 2) Differential Nonlinearity (Notes 1 and 2) End-to-End Resistor Tempco Ratiometric Resistor Tempco MAX5451 Full-Scale Error MAX5453 MAX5455 MAX5451 Zero-Scale Error DC PERFORMANCE (Variable Resistor Mode) Resolution Integral Nonlinearity (Notes 1 and 3) N VDD = +5V INL VDD = +3V Differential Nonlinearity (Notes 1 and 3) DNL VDD = +5V VDD = +3V VDD = +5V VDD = +3V 10 MAX5450, MAX5451 End-To-End Resistance RHL MAX5452, MAX5453 MAX5454, MAX5455 6.5 32 60 10 50 100 12.5 62.5 125 k 225 550 MAX5450, MAX5451 MAX5452MAX5455 MAX5450, MAX5451 MAX5452MAX5455 8 ±3 ±1 ±4.5 ±2 ±1 ±1 LSB LSB Bits MAX5453 MAX5455 SYMBOL N INL DNL TCR VDD = +5V VDD = +3V VDD = +5V VDD = +3V 35 5 -8 -1.6 -0.8 +8 +1.6 +0.8 LSB LSB CONDITIONS MIN 8 ±1 ±1 ±1 ±1 TYP MAX UNITS Bits LSB LSB ppm/°C ppm/°C
DC PERFORMANCE (Voltage-Divider Mode, MAX5451/MAX5453/MAX5455 Only)
DC PERFORMANCE (Resistor Characteristics) Wiper Resistance (Note 4) Wiper Capacitance RW CW pF
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Dual, 256-Tap, Up/Down Interface, Digital Potentiometers
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, TA = +25°C, unless otherwise noted.)
PARAMETER DIGITAL INPUTS (Note 5) Input High Voltage Input Low Voltage Input Leakage Current Input Capacitance TIMING CHARACTERISTICS (Analog) MAX5451 Wiper-Settling Time (Note 6) tIW MAX5453 MAX5455 TIMING CHARACTERISTICS (Digital, Note 7, Figure 1) Maximum INC Frequency CS to INC Setup Time CS to INC Hold Time INC Low Period INC High Period U/D to INC Setup U/D to INC Hold POWER SUPPLIES Supply Voltage Supply Current VDD IDD CS = INC = U/D = VDD or GND VDD = +5V VDD = +2.7V 2.7 0.7 0.1 5.5 2 V µA fMAX tCI tIC tIL tIH tDI tID 7 25 0 25 25 50 0 MHz ns ns ns ns ns ns 0.5 1.2 1.8 µs 5 VIH VIL 0.7 x VDD 0.3 x VDD ±1.0 V V µA pF SYMBOL CONDITIONS MIN TYP MAX UNITS
MAX5450MAX5455
Note 1: Linearity is defined in terms of the H_ to L_ code-dependent resistance. Note 2: The DNL and INL are measured with the potentiometer configured as a voltage divider with H_ = VDD and L_ = GND. The wiper terminal is unloaded and measured with an ideal voltmeter. Note 3: The DNL and INL are measured with the potentiometer configured as a variable resistor. For the 3-terminal potentiometers (MAX5451/MAX5453/MAX5455), H_ is unconnected and L_ = GND. For the 2-terminal potentiometers (MAX5450/MAX5452/MAX5454), L_ = GND. At VDD = +5V, the wiper terminal is driven with a source current of 400µA for the 10k configuration, 80µA for the 50k configuration, and 40µA for the 100k configuration. At VDD = +3V, 200µA/40µA/20µA for 10k/50k/100k configuration, respectively. Note 4: The wiper resistance is the worst value measured by injecting the currents given in Note 3 into W_ with L_ = GND. RW_ = (VW_ - VH_) / IW_. Note 5: Device draws higher supply current when digital inputs are driven with voltages between 0.3 x VDD and 0.7 x VDD. (See Supply Current vs. Digital Input Voltage in the Typical Operating Characteristics.) Note 6: Wiper-Settling Time is the worst case 0% to 50% rise-time measured between consecutive wiper positions. H_ = VDD, L_ = GND, and the wiper terminal is unloaded and measured with a 10pF oscilloscope probe (see Tap-To-Tap Switching Transient in the Typical Operating Characteristics). Note 7: Digital timing is guaranteed by design.
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