Document
19-3185; Rev 3; 3/09
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256-Tap, Nonvolatile, I2C-Interface, Digital Potentiometers
General Description
The MAX5417/MAX5418/MAX5419 nonvolatile, lineartaper, digital potentiometers perform the function of a mechanical potentiometer by replacing the mechanics with a simple 2-wire digital interface, allowing communication with multiple devices. Each device performs the same function as a discrete potentiometer or variable resistor and has 256 tap points. The devices feature an internal, nonvolatile EEPROM used to store the wiper position for initialization during power-up. The fast-mode I2C-compatible serial interface allows communication at data rates up to 400kbps, minimizing board space and reducing interconnection complexity in many applications. Each device is available with one of four factory-preset addresses (see the Selector Guide) and features an address input for a total of eight unique address combinations. The MAX5417/MAX5418/MAX5419 provide three nominal resistance values: 50k Ω (MAX5417), 100k Ω (MAX5418), or 200kΩ (MAX5419). The nominal resistor temperature coefficient is 35ppm/°C end-to-end, and only 5ppm/°C ratiometric. This makes the devices ideal for applications requiring a low-temperature-coefficient variable resistor, such as low-drift, programmable gainamplifier circuit configurations. The MAX5417/MAX5418/MAX5419 are available in a 3mm x 3mm 8-pin TDFN package, and are specified over the extended -40°C to +85°C temperature range.
Features
♦ Power-On Recall of Wiper Position from Nonvolatile Memory ♦ Tiny 3mm x 3mm 8-Pin TDFN Package ♦ 35ppm/°C End-to-End Resistance Temperature Coefficient ♦ 5ppm/°C Ratiometric Temperature Coefficient ♦ 50kΩ/100kΩ/200kΩ Resistor Values ♦ Fast I2C-Compatible Serial Interface ♦ 500nA (typ) Static Supply Current ♦ Single-Supply Operation: +2.7V to +5.25V ♦ 256 Tap Positions ♦ ±0.5 LSB DNL in Voltage-Divider Mode ♦ ±0.5 LSB INL in Voltage-Divider Mode
MAX5417/MAX5418/MAX5419
Functional Diagram
H VDD GND 8-BIT SHIFT REGISTER 8 8-BIT 8 LATCH 256256 POSITION DECODER W L SDA SCL A0 I2C INTERFACE POR 8-BIT NV MEMORY
Applications
Mechanical Potentiometer Replacement Low-Drift Programmable-Gain Amplifiers Volume Control Liquid-Crystal Display (LCD) Contrast Control
MAX5417 MAX5418 MAX5419
Ordering Information/Selector Guide
PART MAX5417LETA MAX5417META* MAX5417NETA* MAX5417PETA* MAX5418LETA MAX5418META* MAX5418NETA* MAX5418PETA* MAX5419LETA MAX5419META* MAX5419NETA* 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 -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 I C ADDRESS 010100A0 010101A0 010110A0 010111A0 010100A0 010101A0 010110A0 010111A0 010100A0 010101A0 010110A0 010111A0
2
R (kΩ) 50 50 50 50 100 100 100 100 200 200 200 200
PIN-PACKAGE 8 TDFN-EP** 8 TDFN-EP** 8 TDFN-EP** 8 TDFN-EP** 8 TDFN-EP** 8 TDFN-EP** 8 TDFN-EP** 8 TDFN-EP** 8 TDFN-EP** 8 TDFN-EP** 8 TDFN-EP** 8 TDFN-EP**
TOP MARK AIB A.