PDF MAX5495 Data sheet ( Hoja de datos )

Número de pieza	MAX5495
Descripción	10-Bit - Dual - Nonvolatile/ Linear-Taper Digital Potentiometers
Fabricantes	Maxim Integrated Products
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No Preview Available ! 19-3562; Rev 1; 6/05 www.DataSheet4U.com 10-Bit, Dual, Nonvolatile, Linear-Taper Digital Potentiometers General Description The MAX5494–MAX5499 10-bit (1024-tap), dual, non- volatile, linear-taper, programmable voltage-dividers and variable resistors perform the function of a mechanical potentiometer, but replace the mechanics with a 3-wire SPI™-compatible serial interface. The MAX5494/MAX5495 are dual, 3-terminal, programma- ble voltage-dividers; the MAX5496/MAX5497 are dual, 2-terminal variable resistors; and the MAX5498/ MAX5499 include one 2-terminal variable resistor and one 3-terminal programmable voltage-divider. The MAX5494–MAX5499 feature an internal, nonvolatile, electrically erasable programmable read-only memory (EEPROM) that stores the wiper position for initialization during power-up. The 3-wire SPI-compatible serial inter- face allows communication at data rates up to 7MHz. The MAX5494–MAX5499 are ideal for applications requir- ing digitally controlled potentiometers. End-to-end resis- tance values of 10kΩ and 50kΩ are available with a 35ppm/°C end-to-end temperature coefficient. The ratio- metric temperature coefficient is 5ppm/°C for each chan- nel, making these devices ideal for applications requiring low-temperature-coefficient programmable voltage- dividers such as low-drift, programmable-gain amplifiers. The MAX5494–MAX5499 operate with either a single power supply (+2.7V to +5.25V) or dual power supplies (±2.5V). The devices consume 400µA (max) of supply current when writing data to the nonvolatile memory and 1.5µA (max) of standby supply current. The devices are available in space-saving (5mm x 5mm x 0.8mm), 16-pin TQFN package and are specified over the extended (-40°C to +85°C) temperature range. Applications Gain and Offset Adjustment LCD Contrast Adjustment Pressure Sensors Low-Drift Programmable-Gain Amplifiers Mechanical Potentiometer Replacement Volume Control Ordering Information PART TEMP RANGE PIN- PACKAGE PKG CODE Features ♦ Wiper Position Stored in Nonvolatile Memory and Recalled Upon Power-Up ♦ 16-Pin, 5mm x 5mm x 0.8mm TQFN Package ♦ 35ppm/°C End-to-End Resistance Temperature Coefficient ♦ 5ppm/°C Ratiometric Temperature Coefficient ♦ 10kΩ and 50kΩ End-to-End Resistor Values ♦ 3-Wire SPI-Compatible Serial Interface ♦ Reliability (TA = +85°C) 50,000 Wiper Store Cycles 50 Years Wiper Data Retention ♦ 1.5µA (max) Standby Current ♦ Single +2.7V to +5.25V Supply Operation ♦ Dual ±2.5V Supply Operation Pin Configurations TOP VIEW 12 11 10 9 DIN 13 N.C. 14 N.C. 15 SCLK 16 MAX5494 MAX5495 8 VSS 7 N.C. 6 N.C. 5 VDD 1 23 4 5mm × 5mm × 0.8mm TQFN DIN 13 N.C. 14 N.C. 15 SCLK 16 12 11 10 9 MAX5496 MAX5497 8 VSS 7 N.C. 6 N.C. 5 VDD MAX5494ETE -40°C to +85°C 16 TQFN-EP* T1655-2 MAX5495ETE -40°C to +85°C 16 TQFN-EP* T1655-2 *EP = Exposed pad. Ordering Information continued at end of data sheet. Selector Guide appears at end of data sheet. SPI is a trademark of Motorola, Inc. 1 23 4 5mm × 5mm × 0.8mm TQFN Pin Configurations continued at end of data sheet. ________________________________________________________________ Maxim Integrated Products 1 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. 1 page www.DataSheet4U.com 10-Bit, Dual, Nonvolatile, Linear-Taper Digital Potentiometers TIMING CHARACTERISTICS (VDD = +2.7V to +5.25V, VSS = GND = 0, VH_ = VDD, VL_ = 0, TA = -40°C to +85°C, unless otherwise noted. Typical values are at VDD = +5.0V, TA = +25°C.) (Note 1) PARAMETER SYMBOL CONDITIONS ANALOG SECTION Wiper Settling Time (Note 6) MAX5494/MAX5498 tS MAX5495/MAX5499 SPI-COMPATIBLE SERIAL INTERFACE (Figure 6) SCLK Frequency SCLK Clock Period SCLK Pulse-Width High SCLK Pulse-Width Low CS Fall to SCLK Rise Setup SCLK Rise to CS Rise Hold DIN to SCLK Setup DIN Hold After SCLK SCLK Rise to CS Fall Delay CS Rise to SCLK Rise Hold CS Pulse-Width High Write NV Register Busy Time fSCLK tCP tCH tCL tCSS tCSH tDS tDH tCS0 tCS1 tCSW tBUSY MIN TYP MAX UNITS 5 µs 22 7 MHz 140 ns 60 ns 60 ns 60 ns 0 ns 40 ns 0 ns 15 ns 60 ns 150 ns 12 ms Note 1: 100% production tested at TA = +25°C and TA = +85°C. Guaranteed by design to TA = -40°C. Note 2: The DNL and INL are measured for the voltage-divider with H_ = VDD and L_ = VSS. The wiper terminal (W_) is unloaded and measured with a high-input-impedance voltmeter. Note 3: The DNL and INL are measured with L_ = VSS = 0. For VDD = 5V, the wiper terminal is driven with a current source of IW = 80µA for the 50kΩ device and IW = 400µA for the 10kΩ device. For VDD = 3V, the wiper terminal is driven with a current source of IW = 40µA for the 50kΩ device and IW = 200µA for the 10kΩ device. Note 4: The wiper resistance is measured using the source currents given in Note 3. Note 5: The device draws higher supply current when the digital inputs are driven with voltages between (VDD - 0.5V) and (GND + 0.5V). See the Supply Current vs. Digital Input Voltage graph in the Typical Operating Characteristics. Note 6: Wiper settling test condition uses the voltage-divider with a 10pF load on W_. Transition code from 0 to 495 and measure the time from CS going high to the wiper voltage settling to within 0.5% of its final value. _______________________________________________________________________________________ 5 5 Page www.DataSheet4U.com 10-Bit, Dual, Nonvolatile, Linear-Taper Digital Potentiometers Functional Diagrams (continued) VDD GND VSS CS SCLK DIN 2 x 10 BIT POR NVM SPI INTERFACE MAX5496 MAX5497 10-BIT 10 LATCH 1024 DECODER TAPS 10-BIT 10 LATCH 1024 TAPS DECODER Figure 2. MAX5496/MAX5497 Functional Diagram W1 L1 W2 L2 H1 VDD GND VSS CS SCLK DIN 2 x 10 BIT POR NVM SPI INTERFACE 10-BIT 10 LATCH 1024 TAPS DECODER 10-BIT 10 LATCH MAX5498 MAX5499 1024 TAPS DECODER W1 L1 W2 L2 NOTE: THE PROGRAMMABLE VOLTAGE-DIVIDER IS NOT INTENDED FOR CURRENT TO FLOW THROUGH THE WIPER. NOTE: SEE THE MAX5494/MAX5495/MAX5498/MAX5499 PROGRAMMABLE VOLTAGE-DIVIDERS SECTION. Figure 3. MAX5498/MAX5499 Functional Diagram ______________________________________________________________________________________ 11 11 Page

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