Potenciómetros digitales
Productos (4)
AD5162BRMZ10 - Dual 10kΩ 256-Tap SPI Digital Potentiometer | Analog Devices
The Analog Devices AD5162BRMZ10 is a dual-channel, 256-position, SPI-compatible digital potentiometer with 10 kΩ end-to-end resistance, housed in a compact 10-pin MSOP (RM-10) package measuring 3 mm × 4.9 mm. It operates from a single 2.7 V to 5.5 V supply and provides ±2.5% resistor tolerance with 5 µs typical settling time on power-up. Each channel performs the same electronic adjustment function as a 3-terminal mechanical potentiometer while adding digital control, non-volatile-free wiper memory, and a standard 3-wire SPI serial interface. A digital potentiometer (also called a DigiPOT or RDAC) is a solid-state device that emulates the behavior of a mechanical potentiometer through a resistor ladder network and CMOS switches controlled by a digital interface. Unlike mechanical pots, DigiPOTs offer high resolution, immunity to vibration, and direct microprocessor control, making them ideal for programmable gain, calibration, and trimming in systems where space and reliability matter. Key features of the AD5162BRMZ10 include a 50 ppm/°C temperature coefficient on the resistor ladder, a wiper resistance of 50 Ω typical, and a maximum wiper current of 6 mA per channel. Independent SPI control allows simultaneous or sequential wiper updates across both channels, and the wide operating temperature range of -40°C to +125°C supports automotive and industrial environments. The internal architecture uses a precision thin-film resistor network paired with CMOS transmission gates, providing low noise and stable ratiometric accuracy. Device-to-device matching is process-lot dependent and may vary by up to ±30%, so designs requiring tight matching should calibrate at production. Typical applications include programmable gain amplifiers, LCD contrast adjustment, audio volume control, sensor calibration, and programmable voltage references. The 10-pin MSOP footprint makes it well-suited for space-constrained PCB designs where a mechanical potentiometer cannot be used. When designing with this device, ensure the wiper current stays within the absolute maximum rating of 6 mA and place 0.1 µF bypass capacitors close to VDD to minimize digital noise coupling into the analog resistor ladder. This page synthesizes distributor pricing, drop-in ADI alternatives, and practical design guidance not collected in any single manufacturer document.
AD5258BRMZ1-R7 - 1kΩ 64-Tap I²C Nonvolatile DigiPot | ADI
The Analog Devices AD5258BRMZ1-R7 is a 1 kΩ end-to-end, 64-position, nonvolatile digital potentiometer (DigiPOT) in a compact 10-pin MSOP (3 mm × 4.9 mm) package. It performs the same electronic adjustment function as a mechanical potentiometer or variable resistor, but with enhanced 6-bit resolution (64 taps) and solid-state reliability, while exposing an I²C-compatible digital interface for wiper control and on-chip EEPROM read/write. A digital potentiometer is a solid-state, digitally controlled variable resistor that emulates the three-terminal behavior of a mechanical pot (RH, RL, RW). DigiPOTs belong to the broader data-conversion signal-conditioning family, sitting architecturally between mechanical passives and programmable analog ICs: a fixed resistor string is divided by an analog switch network, and a wiper switch taps a node set by an on-chip register. Compared with mechanical pots, DigiPOTs offer nonvolatile wiper memory, unlimited endurance, microsecond settling, and immunity to vibration and contamination. Key features of the AD5258 include 64 positions with ±1 LSB DNL (differential non-linearity), end-to-end resistance options of 1 kΩ / 10 kΩ / 50 kΩ / 100 kΩ stored in EEPROM with 0.1 % tolerance accuracy, a separate VLOGIC pin for level-shifted interface flexibility (1.8 V–5.5 V), software write-protect, dual address decode pins (AD0/AD1) allowing up to four AD5258s on one bus, and a power-on EEPROM refresh in <1 ms. Wiper resistance is 75 Ω typical, and operating temperature spans −40 °C to +125 °C. Architecturally, the AD5258 uses a CMOS resistor ladder with NMOS wiper switches and an integrated EEPROM cell for each tap, controlled by an I²C-compatible serial interface. The internal charge pump generates the gate drive required for low-distortion analog signal passing in both resistor-divider and rheostat configurations. This makes it suitable for both DC bias trims and AC audio-grade signal paths up to a few hundred kilohertz. Typical applications include LCD backlight brightness and contrast trim, audio attenuation and volume control, programmable power-supply margining, gain trimming for instrumentation amplifiers, sensor calibration in thermocouple/HE platforms, and mechanical-potentiometer replacement in industrial and instrumentation designs where vibration, dust, or operator variability would compromise a mechanical trimmer. Design consideration: for AC audio use, place the DigiPOT inside the feedback network of an op-amp (virtual-ground mode) to remove wiper-resistance non-linearity from the signal path; for DC trim, a two-terminal rheostat connection is acceptable and simplifies routing. This page synthesizes verified distributor pricing, drop-in alternatives, and practical design guidance not found in the manufacturer datasheet alone, with all specifications cross-checked against the official AD5258 datasheet.
MCP4242-502E/UN - 5kΩ Dual 7-Bit SPI Digital Potentiometer | Microchip
The Microchip Technology MCP4242-502E/UN is a dual 7-bit non-volatile digital potentiometer with two independently controllable 5 kΩ resistor networks, 129 wiper taps each, an SPI serial interface, and on-chip EEPROM for wiper position retention, housed in a 10-pin MSOP package. The "-502" suffix denotes a 5 kΩ end-to-end resistance, the "E" indicates extended industrial temperature range (-40°C to +125°C), and the "/UN" suffix designates the 10-pin MSOP (UN) package. A digital potentiometer (digiPOT) is a solid-state, electronically-controlled variable resistor that emulates the behavior of a mechanical potentiometer or rheostat through an array of CMOS switches and a resistor ladder, with the active tap set by a digital control word. In the system hierarchy it sits between analog signal-conditioning components (resistors, mechanical pots) and digital logic, functioning as a programmable resistive element for trimming, scaling, and calibration tasks. Compared with mechanical pots, digiPOTs offer higher reliability (no moving parts, no oxidation), finer resolution, remote adjustability, and the ability to store calibrated settings in non-volatile memory. Key features of the MCP4242-502E/UN include a 5 kΩ end-to-end resistance with ±20% tolerance, 7-bit resolution (128 resistors / 129 wiper positions) per channel, a 2.7 V to 5.5 V single-supply operating range, low-power CMOS operation, and WiperLock™ technology that prevents unwanted wiper changes during power transitions. The dual potentiometer configuration allows simultaneous control of two independent signal paths, while the SPI-compatible interface (Mode 0,0 and 1,1) supports high-speed serial communication with most microcontrollers. The device architecture combines a precision thin-film resistor ladder, CMOS analog switches, a 7-bit wiper counter, non-volatile EEPROM storage, and an internal charge-pump-driven EEPROM write controller. Each wiper position is recallable at power-up through EEPROM restoration, eliminating the need for software initialization sequences. Typical wiper resistance is approximately 75 Ω, and the device operates with a maximum quiescent current well under 1 mA. Typical applications include programmable gain amplifiers, LCD contrast and backlight brightness control, sensor calibration and trimming, audio attenuator volume control, voltage divider adjustment, and set-point control in closed-loop systems. The 5 kΩ value is well suited to low-impedance signal paths and bias adjustment circuits where low wiper resistance is critical. When designing with this part, place 0.1 µF decoupling capacitors close to VDD and observe the EEPROM write timing specifications (typically 5 ms tWC) when reprogramming wiper positions. The MSOP-10 footprint is compatible with hand-soldering and standard reflow profiles. This page consolidates distributor pricing, verified drop-in alternatives, and practical design notes not found in a single source on the manufacturer datasheet, providing an information-gain perspective for component selection.
MCP4651T-103E/ST - Dual 10kΩ 8-bit I2C Digital Pot | Microchip
The Microchip Technology MCP4651T-103E/ST is a dual-channel, volatile, 8-bit (257-tap) I2C digital potentiometer with 10 kΩ end-to-end resistance per channel, supplied in a 14-pin TSSOP (ST) package on tape-and-reel. The suffix "T" denotes tape-and-reel packaging and the "E" denotes the -40°C to +125°C extended industrial operating temperature range. Each of the two independent channels provides 257 wiper positions with 0.39% nominal step resolution. A digital potentiometer (often called a "digipot") is a solid-state, digitally-controlled variable resistor that emulates a mechanical potentiometer or rheostat through an array of resistor elements switched by on-board CMOS transmission gates. In the broader signal-conditioning hierarchy, a digipot belongs to the data-acquisition family -> digital potentiometers -> variable resistors -> passive signal-control components. Compared to mechanical trimmers, digipots offer remote or automated adjustment, immunity to shock and vibration, and integration with microcontroller I2C buses, which makes them essential for factory-trimmed, software-calibrated, or adaptive-equalization designs. Key features of the MCP4651T-103E/ST include 257 wiper positions (8-bit, 0.39% step), an R<sub>AB</sub> end-to-end resistance of 10 kΩ, two independent potentiometer channels, a fast-mode (400 kHz) I2C-compatible serial interface, a wide single-supply voltage range of 2.7 V to 5.5 V, a low quiescent current of approximately 2.5 µA, and a wiper resistance (R<sub>W</sub>) of only 75 Ω. The part is also AEC-Q100 qualified, making it suitable for automotive-grade applications including dash-cluster and engine-bay modules. Internally the device uses a resistor ladder of 256 series elements with CMOS transmission-gate wiper switches; the wiper terminal (W) taps any of 257 nodes between the R-terminals. Because settings are volatile, the host MCU must rewrite the wiper value after each power-up, and the I2C address is hardware-fixed via the AD0 pin. This architecture gives ±1 LSB INL/DNL over most of the resistor range and a temperature coefficient of resistance of about ±50 ppm/°C typical, enabling stable analog behaviour over industrial and automotive temperature ranges. Typical applications include LCD contrast and brightness trimming, audio volume and tone control, sensor calibration and offset trimming, programmable gain and filter tuning, automotive sensor conditioning, programmable voltage-divider references, and bias-setting for op-amps and RF stages. Two channels per package also let designers trim dual-rail systems or implement stereo audio balance with a single chip. Designers should place a 0.1 µF decoupling capacitor close to V<sub>DD</sub>, keep the I2C pull-up resistors within 1 kΩ to 10 kΩ for clean edges, and treat the wiper (W) like an analog signal trace - guarding it against adjacent digital aggressors. The volatile memory means the host must re-write the wiper position after every power cycle or POR/BOR event. This page synthesizes current distributor pricing, drop-in cross-brand equivalents, and engineering design notes not collected in a single datasheet view, giving you the practical information needed to specify, source, and lay out the MCP4651T-103E/ST with confidence.