数据采集IC
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AD5110BCPZ10-RL7 - 128-Tap 10kΩ I2C Nonvolatile DigiPot | Analog Devices
The Analog Devices AD5110BCPZ10-RL7 is a single-channel, 128-position, nonvolatile digital potentiometer with 10 kΩ nominal end-to-end resistance, I2C-compatible digital interface, ±8% maximum resistor tolerance error, ±6 mA wiper current capability, and a 4 MHz bandwidth (5 kΩ option), housed in an 8-lead LFCSP-UD (2 mm × 2 mm) package. It integrates EEPROM-backed wiper position memory, giving true power-on recall of the last programmed resistance without an external backup supply. A digital potentiometer (digiPot) is a solid-state, electronically controllable resistor that emulates a mechanical potentiometer or rheostat by switching between discrete resistive elements under digital control. In the hierarchy of electronic components, digiPots belong to the data-conversion/signal-conditioning family, sitting alongside analog potentiometers, mechanical trimmers, and digital-to-analog converters (DACs); they are widely used for system-level calibration, user-interface trim, and gain/offset adjustment in circuits that must be reconfigured in firmware rather than by hand. The AD5110's three principal terminals—A (high terminal), W (wiper), and B (low terminal)—support both potentiometer (three-terminal, voltage divider) and rheostat (two-terminal, variable resistor) configurations. Key benefits include a 35 ppm/°C rheostat-mode temperature coefficient for low-drift trimming, 2.5 µA maximum supply current at 2.7 V and 125 °C, and an I2C interface with readback of both the wiper register and EEPROM. Resistor tolerance is factory-stored in EEPROM, enabling an end-to-end tolerance accuracy of 0.1% after host-side calibration. Typical applications include LCD bias adjustment, laser-diode driver trim, RF power-detector gain calibration, programmable-gain instrumentation amplifiers, and audio volume/bias control where mechanical pots are unsuitable due to vibration, contamination, or remote-control requirements. The nonvolatile memory eliminates the need for software re-initialization after each power-up, an important advantage in headless or factory-calibrated systems. When designing with the AD5110, observe the ±6 mA wiper current limit to avoid permanent resistance-shift damage, and place a 0.1 µF decoupling capacitor close to the VDD pin. The wide 2.3 V–5.5 V supply range simplifies integration into both 3.3 V and 5 V microcontroller systems. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the standalone manufacturer datasheet.
AD5174BRMZ-10 - 10kΩ 1024-Tap SPI Digital Rheostat | Analog Devices
The Analog Devices AD5174BRMZ-10 is a single-channel, 1024-position digital rheostat with 10 kΩ nominal end-to-end resistance and 50-times programmable nonvolatile memory (50-TP), housed in a 10-lead MSOP (RM suffix) package. It combines industry-leading variable-resistor performance with SPI serial interface and NVM, supporting both single-supply (2.7 V to 5.5 V) and dual-supply (±2.5 V to ±2.75 V) operation. The part is specified over the extended industrial temperature range of -40 °C to +125 °C. A digital potentiometer (or digital rheostat) is a solid-state, electronically controllable resistor whose wiper position is set by a digital word rather than by a mechanical actuator. Internally it consists of a string of equal-value resistor segments with CMOS transmission-gate switches that connect the wiper terminal to a tap point; the device therefore behaves like a mechanical trim pot but without the mechanical wear, vibration sensitivity, or hand-tuning labor of a true potentiometer. Digital pots sit in the broader hierarchy: digital rheostat -> digital potentiometer -> programmable resistor -> data-acquisition/signal-conditioning IC -> semiconductor. Nonvolatile memory (EEPROM or fuse-based) added on-chip allows the wiper setting to survive power cycles, eliminating software re-initialization at every boot. Key specifications of the AD5174BRMZ-10 include 1024 tap points (≈10-bit resolution, ~0.1% step size), ±1 LSB DNL, ±2 LSB INL (max), 5 kΩ resistor tolerance (max), 50-times writable NVM, an SPI-compatible serial interface up to 25 MHz, and a wiper resistance of 50 Ω (typical). The 10-lead MSOP package provides a compact 3 mm × 3 mm footprint with industry-standard pinout, making the part a drop-in compatible variant of the AD5174 family across multiple resistance options. The AD5174 uses a CMOS architecture with on-chip EEPROM cells storing the last wiper position. Its 50-times programmable memory is suitable for production calibration, gain trimming, and LCD contrast adjustment where the value must be retained across power cycles. The dual-supply mode enables true ground-referenced bipolar signal handling, useful in audio and instrumentation signal paths. Typical applications include precision gain control in instrumentation amplifiers, LCD contrast adjustment, laser driver bias trimming, programmable voltage references, audio attenuators, and industrial control calibration. The wide supply range and SPI interface simplify integration into microcontroller-based designs that lack analog outputs. When designing with the AD5174BRMZ-10, observe the wiper-current limit (≤ ±6 mA continuous) to avoid long-term drift of the on-chip resistors. Decouple VDD/VSS with 0.1 µF ceramic capacitors placed within 3 mm of the supply pins, and place a pull-up resistor on the open-drain SDO line per the datasheet recommendation. The wide 2.7 V–5.5 V supply range enables direct connection to 3.3 V or 5 V microcontrollers without level shifters. This page synthesizes distributor pricing, drop-in pin-compatible alternatives, parametric comparison tables, and practical design notes not consolidated in the manufacturer datasheet.