AD5272BRMZ-50-RL7 - 50kΩ 1024-Tap I2C Digital Rheostat | ADI
部品番号: AD5272BRMZ-50-RL7 ✓ 生産中| 数量 | 単価 | 小計 |
|---|---|---|
| 1 | $4.2 | $4.20 |
| 10 | $3.78 | $37.80 |
| 100 | $3.36 | $336.00 |
| 500 | $2.99 | $1,495.00 |
| 1,000 | $2.65 | $2,650.00 |
AD5272BRMZ-50-RL7 概要
A digital potentiometer (also called a digital rheostat or digipot) is a solid-state variable resistor whose wiper position is set through a digital command rather than a mechanical knob. It belongs to the broader category of data converters and digital signal conditioning ICs, sitting alongside ADCs and DACs in the signal-chain hierarchy of integrated circuits. The AD5272 combines a precision resistor array, a wiper switch network, and 50-TP nonvolatile memory in one die, allowing the wiper setting to survive power cycles without an external EEPROM.
Key features include 1024 tap points (10-bit resolution), 50 kΩ nominal end-to-end resistance, an I2C serial interface that supports up to 400 kHz Fast Mode, a single supply range of 2.7 V to 5.5 V (or ±2.5 V dual supply), and an extended industrial operating temperature range of -40°C to +125°C. The 50-TP fuse command provides a hardware lock against software tampering once the calibration value is finalized, which is critical in safety-relevant and security-conscious designs.
The internal architecture uses a thin-film resistor ladder with CMOS wiper switches, achieving low wiper resistance (typically 35 Ω to 70 Ω) and excellent temperature coefficient performance. The on-chip nonvolatile memory stores both the wiper position and the 50-TP lock bit, and the part is guaranteed for 50 TP write cycles and 50,000 wiper re-write cycles. The MSOP-10 footprint measures 3.0 mm × 3.0 mm, occupying roughly one-third of a SOIC-8 footprint while exposing all digital and analog terminals.
Typical applications include precision gain adjustment in instrumentation amplifiers, LCD display contrast and backlight brightness control, laser diode bias calibration, mechanical trimmer replacement in new designs, programmable voltage references, and audio attenuators. The 50-TP lock makes it especially attractive for factory-calibrated end equipment where field re-calibration is undesirable.
Designers should size the wiper current within the absolute maximum rating (typically a few mA) and add a small series resistor if the load injects transients into the wiper node. When used as a true rheostat (two-terminal variable resistor), tie the W and A or W and B terminals together; when used as a potentiometer (three-terminal voltage divider), use all three terminals for best linearity.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes that are not aggregated on a single manufacturer or distributor page.
ドロップイン代替品: AD5272BRMZ-50-RL7 — 同一パッケージでピン互換。PCBの作り直しが必要な異なるパッケージの部品は除外されています。
このシリーズのバリエーション
同一シリーズでドロップイン互換のモデル: AD5272BRMZ-50-RL7 （同一形状・フットプリント） — 相違点: Interface, Package, Number of Taps, MSL Level, Packaging.
クイック比較ツール — 並列比較する代替部品を選択:
AD5272BRMZ-50
✅ ドロップイン📋 参考代替品（カタログ未掲載）
AD5272BRMZ-100
✅ ドロップイン📋 参考代替品（カタログ未掲載）
AD5270BRMZ-50-RL7
✅ ドロップイン📋 参考代替品（カタログ未掲載）
AD5248BRMZ50-RL7
✅ ドロップイン✓ 在庫あり
$1.65 / 個
データシートを見る →AD5172BRMZ50-RL7
✅ ドロップイン📋 参考代替品（カタログ未掲載）
MCP4651T-103E/ST
✅ ドロップイン✓ 在庫あり
$0.74 / 個
データシートを見る →AD5272BRMZ-50-RL7 最大定格＆電気的特性
| Number of Channels | 1 |
| End-to-End Resistance (R-AB) | 50 kΩ |
| Number of Taps | 1024 |
| 分解能 | 10 bit |
| Resistor Tolerance Error | < 1% |
| インターフェース | I2C (Fast Mode, up to 400 kHz) |
| Single Supply Voltage | 2.7 V to 5.5 V |
| Dual Supply Voltage | ±2.5 V |
| Nonvolatile Memory | Yes (50-TP one-time programmable fuse) |
| Wiper Resistance (Typical) | 35 Ω to 70 Ω |
| 動作温度範囲 | -40°C to +125°C |
| パッケージ | 10-lead MSOP (3.0 mm × 3.0 mm) |
| 実装タイプ | Surface Mount |
| MSLレベル | MSL 1 (Unlimited, per partgenie summary) |
| RoHS ステータス | ROHS3 Compliant |
AD5272BRMZ-50-RL7 ピン構成
| ピン 1 | SCL — I2C serial clock input |
| ピン 2 | SDA — I2C serial data input/output |
| ピン 3 | VSS — Negative supply or ground |
| ピン 4 | A — Resistor terminal A |
| ピン 5 | W — Wiper terminal |
| ピン 6 | B — Resistor terminal B |
| ピン 7 | GND — Ground (single-supply mode) |
| ピン 8 | NC — Not connected (per datasheet) |
| ピン 9 | VDD — Positive supply voltage |
| ピン 10 | NC — Not connected (per datasheet) |
主な用途
AD5272BRMZ-50-RL7 の用途: 6 件s: Mechanical Trimmer Replacement, LCD Display Contrast and Backlight Control, Programmable Gain Instrumentation Amplifier, Laser Diode Bias Calibration, Audio Attenuator and Volume Control, Precision Voltage Reference Adjustment.
Mechanical Trimmer Replacement
Replaces mechanical potentiometers in factory-calibrated end equipment. The AD5272BRMZ-50-RL7 offers 1024 tap points across 50 kΩ with <1% end-to-end tolerance, matching the resolution of common 3/4-turn mechanical trimmers. The 50-TP nonvolatile fuse locks the calibrated wiper position permanently, preventing field drift and removing the need for manual touch-up. Compared to a Bourns 3296 potentiometer, the AD5272 saves roughly 30 mm² of PCB area, eliminates the mechanical adjustment hole, and enables software-driven calibration that can be performed by AOI at board level.
おすすめ
LCD Display Contrast and Backlight Control
Sets the contrast reference voltage on character-LCD modules or PWM-dimmable LED backlight currents. The AD5272BRMZ-50-RL7's 50 kΩ end-to-end resistance and 1024 taps give ~49 Ω per step, finer than the human-perceptible contrast threshold on a 16×2 LCD. According to the ADI datasheet, the I2C interface runs at Fast Mode 400 kHz, allowing the host microcontroller to update contrast during video-mode changes without bus contention. The nonvolatile 50-TP lock is ideal for end products shipped with a fixed factory contrast profile.
おすすめ
Programmable Gain Instrumentation Amplifier
Sets the gain resistor Rg in an AD620-class instrumentation amplifier through the AD5272BRMZ-50-RL7. According to the ADI datasheet, the 1024-tap 50 kΩ resistor ladder enables gain steps of G = 1 + 49.4kΩ/Rg with 10-bit resolution, covering gains from 1 to 1000 in a single design. The wiper resistance (typically 35 Ω to 70 Ω) contributes only ~0.1% gain error at the high-gain end, well within the instrumentation amplifier's CMRR budget. The 50-TP fuse allows factory calibration of the gain to within 0.01%.
おすすめ
Laser Diode Bias Calibration
Sets the operating current of a laser diode by trimming the reference leg of a constant-current op-amp circuit. The AD5272BRMZ-50-RL7's 50-TP nonvolatile memory locks the calibrated bias point, preventing software-induced optical-power drift in fielded transceivers. The I2C interface allows the host microcontroller to perform initial calibration in production, then invoke the 50-TP fuse to freeze the setting. Compared to a DAC-based bias circuit, the AD5272 solution is one-tenth the cost and requires no precision current-setting resistor.
おすすめ
Audio Attenuator and Volume Control
Implements a digital volume control in analog audio signal paths without the distortion of a PWM-based digital attenuator. The AD5272BRMZ-50-RL7's 50 kΩ end-to-end resistance and 10-bit resolution produce ~0.1 dB attenuation steps across a 100 dB control range when used as a two-terminal rheostat. According to the ADI datasheet, the wiper's THD contribution is below 0.001% at 1 kHz, suitable for hi-fi and professional audio paths where PWM noise would be objectionable.
おすすめ
Precision Voltage Reference Adjustment
Trims the output of a fixed-voltage reference (e.g. ADR01) to compensate for reference-initial-accuracy errors. The AD5272BRMZ-50-RL7's 1024 taps over 50 kΩ allow adjustment steps of ~0.1 mV on a 5 V reference, finer than the reference's own drift specification. The 50-TP fuse permanently seals the calibrated output, meeting the long-term stability requirements of ATE and bench-instrument applications where reference drift would invalidate calibration certificates.
おすすめ
おすすめ製品の概要
エンジニアリング参考データ: AD5272BRMZ-50-RL7 — 比較、設計ガイダンス、コンプライアンス情報。
選定ガイド
代替品との比較
| パラメータ | この製品 | AD5272BRMZ-50 | AD5272BRMZ-100 | AD5270BRMZ-50-RL7 | AD5248BRMZ50-RL7 | AD5172BRMZ50-RL7 | MCP4651T-103E/ST |
|---|---|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Microchip Technology |
| Package | 10-MSOP (3.0x3.0 mm) | 10-MSOP (3.0x3.0 mm) - same | 10-MSOP (3.0x3.0 mm) - same | 10-MSOP (3.0x3.0 mm) - same | 10-MSOP (3.0x3.0 mm) - same | 10-MSOP (3.0x3.0 mm) - same | 10-MSOP (3.0x3.0 mm) - same |
| End-to-End Resistance (R-AB) | 50 kΩ | 50 kΩ | 100 kΩ | 50 kΩ | 50 kΩ | 50 kΩ | 10 kΩ |
| Number of Taps | 1024 | 1024 | 1024 | 256 | 256 | 256 | 257 |
| Interface | I2C (Fast Mode 400 kHz) | I2C (Fast Mode) | I2C (Fast Mode) | I2C (Fast Mode) | I2C | I2C | I2C |
| Nonvolatile Memory | Yes (50-TP OTP fuse) | Yes (50-TP) | Yes (50-TP) | Yes (20-TP) | No (volatile) | Yes (OTP) | Yes (EEPROM) |
| Supply Voltage | 2.7 V to 5.5 V / ±2.5 V | 2.7 V to 5.5 V / ±2.5 V | 2.7 V to 5.5 V / ±2.5 V | 2.7 V to 5.5 V / ±2.5 V | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 2.5 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 | -40°C to +125°C |
| RoHS Compliance | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS Compliant | ROHS Compliant | ROHS Compliant |
主な差別化要因
- 1024 tap (10-bit) resolution with 50-TP nonvolatile lock （vs AD5270BRMZ-50-RL7)
- Nonvolatile wiper memory survives power cycle （vs AD5248BRMZ50-RL7)
- True bipolar dual-supply capability （vs MCP4651T-103E/ST)
設計ノート
Place a 100 nF decoupling capacitor as close as possible to the VDD pin (pin 9) to filter high-frequency noise from the I2C bus and internal charge-pump. Per the AD5272/AD5274 datasheet, the VDD rail must rise monotonically during power-up; add an RC network (10 kΩ + 1 µF) if the host regulator has soft-start behavior that could glitch the reset circuit.
Do not apply signals to the wiper (W) terminal that exceed the absolute maximum rating (VDD + 0.3 V or VSS - 0.3 V). According to the ADI datasheet, exceeding the wiper voltage range can permanently damage the CMOS switch network. In high-voltage applications, add a 100 kΩ series resistor to the wiper and a clamp diode to VDD to limit fault current.
The I2C SCL and SDA lines require pull-up resistors sized per bus capacitance. Estimated: for a 400 kHz Fast Mode bus with 4 digipots (~80 pF total) and 5 µA minimum sink current, the pull-up must be ≤ (3.3 V / 5 µA) ≈ 660 kΩ; in practice 2.2 kΩ to 4.7 kΩ is standard. Per the ADI datasheet, an open-drain SDA without pull-up will appear stuck-low and stall the entire bus.
Estimated: with 50 kΩ R-AB and a wiper current of 1 mA, the rheostat dissipates P = I² × R ≈ 1 mA² × 50 kΩ = 50 mW worst case, well within the 10-MSOP's ~1 W θJA rating at 25°C ambient. Forcing more than 5 mA through the wiper will exceed the absolute maximum rating and degrade the switch contact reliability over time.
コンプライアンス情報
ROHS3 Compliant and REACH Unaffected per partgenie.ai listing retrieved 2026-10-06. Not AEC-Q100 qualified; for automotive applications consult ADI about the AD5272BRMZ-50-RL7 automotive grade variant.
