AD5270BCPZ-100-RL7 - 100kΩ 1024-Tap SPI Digital Rheostat | ADI
Référence : AD5270BCPZ-100-RL7 ✓ Actif| Qté | Prix unitaire | Total |
|---|---|---|
| 1 | $6.4 | $6,40 |
| 10 | $5.78 | $57,80 |
| 100 | $5.12 | $512,00 |
| 500 | $4.55 | $2 275,00 |
| 1 000 | $4.01 | $4 010,00 |
AD5270BCPZ-100-RL7 Présentation
What is a digital potentiometer/rheostat? A digital potentiometer (also called a digital rheostat or digipot) is a solid-state, electronically adjustable resistor implemented as a string of series-connected resistive elements with CMOS switches that tap off at programmable nodes. Compared to mechanical trimmers, digipots offer remote, microcontroller-controlled adjustment, no moving parts, higher reliability, and - in nonvolatile variants like the AD5270 - retention of the wiper position across power cycles without a microcontroller continuously writing the setting. Digital potentiometers occupy a position in the signal-chain taxonomy between passive components (resistors) and active analog ICs (variable-gain amplifiers).
Key differentiating features of the AD5270BCPZ-100-RL7 include industry-leading 1% end-to-end resistor tolerance error (vs. the 20-30% typical of competing rheostats), 50-times-programmable (50-TP) NVM that allows wiper settings to be permanently written during calibration, and a low-temperature-coefficient architecture that maintains setting accuracy over -40°C to +125°C operation. The 1024-tap resolution provides ~0.1% per-step adjustment granularity, making fine calibration of analog signal chains possible in firmware.
The AD5270 is built around a string of precision thin-film resistors with CMOS wiper switches, achieving low wiper resistance and excellent temperature stability. The 50-TP NVM uses fuse-link elements for permanent setting retention, after which subsequent writes are blocked - this prevents accidental overwrites in production. The exposed-pad package provides a low thermal-resistance path that keeps wiper-resistance drift minimal even under sustained write operations.
Typical applications include precision programmable-gain instrumentation amplifiers, LCD display contrast/brightness control, laser-driver bias calibration, mechanical potentiometer and trimmer replacement, programmable voltage references, and audio attenuators. The 50-TP NVM is especially valuable in factory-trimmed industrial systems where calibration data must survive power-down.
Design consideration: when replacing a mechanical trimmer with the AD5270, account for the limited wiper current (typically a few mA maximum) - the AD5270 cannot source/sink large currents or be used as a true power rheostat; it is intended for signal-level adjustment where it presents a high impedance to the surrounding circuit.
This page synthesizes 2026 distributor stock and lead-time, drop-in compatible alternatives, and practical calibration-circuit design notes not found in the manufacturer datasheet alone.
Alternatives de remplacement direct pour AD5270BCPZ-100-RL7 — même boîtier, compatible broche à broche. Les références à boîtier différent nécessitant une retouche du PCB sont exclues.
Outil de comparaison rapide — sélectionnez des références alternatives pour une comparaison côte à côte :
AD5270BCPZ-100
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
AD5271BCPZ-100-RL7
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
AD5272BCPZ-100-RL7
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
AD5272BCPZ-20-RL7
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
AD5272BCPZ-50-RL7
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
AD5270BCPZ-20-RL7
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
AD5270BCPZ-100-RL7 Spécifications
| Part Number | AD5270BCPZ-100-RL7 |
| Manufacturer | Analog Devices Inc. |
| Fonction | Single-channel digital rheostat (digital potentiometer) |
| Number of Circuits | 1 |
| Number of Taps | 1024 |
| Nominal End-to-End Resistance | 100 kΩ |
| End-to-End Resistor Tolerance | ±1% |
| Interface | SPI (4-wire serial) |
| Nonvolatile Memory | 50-TP (50-times programmable) |
| Tension d'alimentation | 2.7 V to 5.5 V |
| Température de fonctionnement | -40 °C to +125 °C |
| Boîtier / Format | 10-LFCSP-WD (3x3 mm) with exposed pad |
| Type de montage | Surface Mount |
| Packaging | Tape & Reel (RL7 = 7-inch reel) |
| Statut RoHS | Compliant |
Configuration des broches de AD5270BCPZ-100-RL7
| Broche 1 | GND — Ground reference |
| Broche 2 | VDD — Positive supply (2.7 V to 5.5 V) |
| Broche 3 | SDO — SPI serial data output (read-back) |
| Broche 4 | SCLK — SPI serial clock input |
| Broche 5 | SYNC — SPI frame synchronization (active low) |
| Broche 6 | SDI — SPI serial data input |
| Broche 7 | RES — Reserved - do not connect (per datasheet) |
| Broche 8 | A — Resistor terminal A |
| Broche 9 | W — Wiper terminal |
| Broche 10 | B — Resistor terminal B |
| Broche EP | EP — Exposed pad - must be soldered to PCB ground plane for thermal dissipation |
Applications typiques
AD5270BCPZ-100-RL7 convient pour 6 applications: Precision Programmable-Gain Instrumentation Amplifier Calibration, LCD Display Contrast and Brightness Control, Laser Diode Bias Current Calibration, Mechanical Potentiometer and Trimmer Replacement, Programmable Voltage Reference Adjustment, Audio Attenuator and Volume Control.
Precision Programmable-Gain Instrumentation Amplifier Calibration
The AD5270BCPZ-100-RL7 sets the gain-setting resistor in a programmable-gain instrumentation amplifier (PGIA), allowing microcontroller-driven calibration of analog front-end gain across 1024 equal steps from 0.1× to 10× full scale. Its ±1% end-to-end resistor tolerance and 100 kΩ nominal resistance minimize gain error in 16- to 20-bit data-acquisition systems. The 50-TP nonvolatile memory stores factory calibration coefficients that survive power cycling, eliminating per-board manual trimming. The 10-LFCSP-WD exposed-pad package maintains low thermal drift during write cycles in dense industrial signal-conditioning layouts.
Recommandé
LCD Display Contrast and Brightness Control
The AD5270BCPZ-100-RL7 replaces mechanical contrast trimmers on LCD display bias networks, providing software-controlled contrast and backlight brightness adjustment through the SPI bus. Its 1024-tap granularity allows smooth, flicker-free brightness transitions in industrial HMI panels and medical displays. The 50-TP NVM retains the user's preferred contrast setting across power cycles, so the display boots at the correct level without re-calibration. The 2.7 V to 5.5 V supply range supports both 3.3 V and 5 V display logic without level translation.
Recommandé
Laser Diode Bias Current Calibration
The AD5270BCPZ-100-RL7 sets the reference voltage in a laser-diode driver feedback loop, enabling firmware-based calibration of optical-output power in fiber-optic transceivers and LiDAR modules. Its ±1% resistor tolerance ensures accurate bias setting, while the 1024-tap resolution allows 0.1 mA granularity in the bias network. The 50-TP NVM permanently stores factory-calibrated laser-bias points during module assembly, providing per-unit optical-power calibration. Low temperature coefficient maintains bias stability over -40 °C to +125 °C in outdoor telecom installations.
Recommandé
Mechanical Potentiometer and Trimmer Replacement
The AD5270BCPZ-100-RL7 is a direct drop-in solid-state replacement for mechanical potentiometers and multi-turn trimmers in factory-calibrated systems, eliminating manual adjustment, vibration-induced wiper noise, and mechanical wear-out. It provides 1024 electronically-set tap positions versus the 1-3 turns of mechanical trimmers, dramatically improving calibration resolution. The 50-TP NVM allows automated factory calibration of up to 50 settings per board before the part is write-protected. Its 100 kΩ nominal matches the value of common signal-level mechanical pots.
Recommandé
Programmable Voltage Reference Adjustment
The AD5270BCPZ-100-RL7 adjusts the trim pin of precision voltage references such as the ADR01/ADR02/ADR05 family, enabling fine-tuning of reference output voltage over a ±5% range with 1024-tap granularity. Combined with the reference's low drift, the AD5270's ±1% end-to-end tolerance allows calibration to within 0.001% of nominal in 16-bit measurement systems. The 50-TP NVM permanently stores the calibration offset during ATE trimming, eliminating the manual potentiometer on the reference circuit. SPI control allows remote calibration in the field without disassembly.
Recommandé
Audio Attenuator and Volume Control
The AD5270BCPZ-100-RL7 acts as a digitally controlled audio attenuator in professional audio equipment, replacing mechanical volume pots with software-controlled level setting via SPI from -90 dB to 0 dB in 1024 logarithmic-equivalent steps. Its ±1% resistance tolerance ensures channel-to-channel matching better than 0.1 dB in stereo applications. The 50-TP NVM retains the user's preferred volume level across power cycles, and the 2.7 V to 5.5 V supply supports both portable and line-voltage audio systems. Low wiper resistance preserves the audio signal-path noise floor.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour AD5270BCPZ-100-RL7 — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | AD5270BCPZ-100 | AD5271BCPZ-100-RL7 | AD5272BCPZ-100-RL7 | AD5272BCPZ-20-RL7 | AD5272BCPZ-50-RL7 |
|---|---|---|---|---|---|---|
| Package | 10-LFCSP-WD (3x3) | 10-LFCSP-WD (3x3) | 10-LFCSP-WD (3x3) | 10-LFCSP-WD (3x3) | 10-LFCSP-WD (3x3) | 10-LFCSP-WD (3x3) |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Number of Taps | 1024 | 1024 | 256 | 1024 | 1024 | 1024 |
| Nominal Resistance | 100 kΩ | 100 kΩ | 100 kΩ | 100 kΩ | 20 kΩ | 50 kΩ |
| End-to-End Tolerance | ±1% | ±1% | ±1% | ±1% | ±1% | ±1% |
| Interface | SPI | SPI | SPI | SPI | SPI | SPI |
| NVM (Writes) | 50-TP | 50-TP | 50-TP | 50-TP | 50-TP | 50-TP |
| Supply Voltage | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 2.7 V to 5.5 V |
| Operating Temperature | -40 °C to +125 °C | -40 °C to +125 °C | -40 °C to +125 °C | -40 °C to +125 °C | -40 °C to +125 °C | -40 °C to +125 °C |
| Shipping Format | Tape & Reel (7-inch) | Tray | Tape & Reel (7-inch) | Tape & Reel (7-inch) | Tape & Reel (7-inch) | Tape & Reel (7-inch) |
Principaux différenciateurs
- 1024-tap (10-bit) resolution in same LFCSP-WD package (vs AD5271BCPZ-100-RL7)
- 50-TP nonvolatile memory for permanent calibration retention (vs AD5270BCPZ-20-RL7)
- Industry-leading ±1% end-to-end resistor tolerance (vs Generic digital potentiometers)
Notes de conception
The exposed pad (EP) of the 10-LFCSP-WD package MUST be soldered to the PCB ground plane for proper thermal dissipation and mechanical reliability. Failing to solder the EP results in thermal resistance rising from the datasheet spec to a much higher value, potentially causing wiper-resistance drift during write cycles and reduced long-term reliability. Place a continuous ground plane directly under the IC and connect the EP with at least 4 thermal vias to the inner ground layer.
When using the AD5270 in low-noise analog circuits, keep the SPI traces short and route them away from sensitive analog signal paths. The SPI bus can inject digital switching noise into adjacent analog traces through PCB parasitic capacitance; a ground trace or guard ring between digital and analog signals is recommended. Add a 0.1 µF decoupling capacitor as close as practical to the VDD pin (pin 2), with a 10 µF bulk capacitor on the same supply rail.
Do not exceed the absolute maximum wiper current specified in the manufacturer datasheet. The AD5270 is intended for signal-level applications only; using it as a power rheostat (carrying more than a few mA continuously) will permanently damage the CMOS wiper switches. For power-rheostat or high-current applications, use a mechanical rheostat or a different topology entirely.
The terminal A, wiper W, and terminal B traces should be routed with wide, short traces to minimize parasitic inductance and resistance that would otherwise degrade the effective resistance tolerance below the ±1% spec. For instrumentation-grade applications, use a 4-wire (Kelvin) connection between the AD5270 terminals and the load circuit, especially for resistances above 50 kΩ where trace resistance becomes a measurable percentage of the total.
Informations de conformité
RoHS and REACH compliant per Analog Devices product page. Lead-free (Pb-free) and halogen-free per ADI environmental compliance documentation. Not AEC-Q100 qualified - automotive applications require an automotive-grade digipot. Conflict-minerals compliant per ADI supply chain policy.
