AD5272BRMZ-20-RL7 - 20kOhm 1024-Tap I2C Digital Rheostat | ADI
부품 번호: AD5272BRMZ-20-RL7 ✓ 활성| 수량 | 단가 | 합계 |
|---|---|---|
| 1 | $6.54 | $6.54 |
| 10 | $5.89 | $58.90 |
| 100 | $5.21 | $521.00 |
| 500 | $4.68 | $2,340.00 |
| 1,000 | $4.12 | $4,120.00 |
AD5272BRMZ-20-RL7 개요
A digital rheostat (sometimes called a digital potentiometer or digipot) is a solid-state replacement for a mechanical potentiometer, providing a programmable two-terminal variable resistor that is controlled through a digital serial bus. It belongs to the broader family of programmable analog ICs sitting between passive components (resistors) and full data-acquisition chains, and is widely used where mechanical trimming is impractical: in calibration, gain setting, sensor linearization, and bias adjustment.
Key features include 1024 tap points, 1% end-to-end resistor tolerance error, a 2.7 V to 5.5 V single-supply operating range, an I2C-compatible 2-wire serial interface supporting both standard (100 kHz) and fast (400 kHz) modes, and 50-times programmable nonvolatile memory with read-back. The rheostat mode (terminal W to terminal A or B) supports unipolar signal swing, and the device includes power-on preset to midscale.
In terms of architecture, the AD5272 uses a CMOS resistor-array structure with a wiper that is digitally addressed and latched into NVM via the I2C bus. The 50-TP architecture provides a controlled write budget to ensure long-term data retention in EEMEM. Compared with purely volatile digipots, the integrated EEMEM eliminates the need for an external EEPROM and a separate programming step on every power-up.
Typical applications include mechanical potentiometer replacement, instrumentation gain adjustment, programmable voltage-to-current conversion, laser-trim replacement, and RF attenuator biasing. The combination of 1% resistor tolerance and 50-TP NVM makes the part especially attractive where calibration is performed once at production and then re-used across multiple power cycles.
When designing with the AD5272, observe the absolute-maximum terminal voltages (Vdd + 0.3 V and -0.3 V on W/A/B). For ac-coupled or bipolar signals, bias the rheostat inside the supply headroom. For best noise performance, use the lower-resistance variants or connect an external resistor in parallel only when the design explicitly accounts for the resulting ratiometric error.
This page synthesizes distributor pricing, drop-in same-package alternatives, and practical design notes drawn from the AD5272/AD5274 datasheet that are not consolidated on any single distributor page.
드롭인 대체품: AD5272BRMZ-20-RL7 — 동일 패키지, 핀 호환. PCB 재작업이 필요한 다른 패키지 부품은 제외됩니다.
이 시리즈의 변형
다음과 드롭인 호환되는 동일 시리즈 모델: AD5272BRMZ-20-RL7 (동일 폼 팩터 및 풋프린트) — 차이점: End-to-End Resistance (R-AB), Interface, MSL Level, Nonvolatile Memory, Operating Temperature Range.
빠른 비교 도구 — 나란히 비교할 대체 부품을 선택하십시오:
AD5272BRMZ-50-RL7
✅ 드롭인✓ 재고 있음
$2.65 / 개
데이터시트 보기 →AD5272BRMZ-100-RL7
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
AD5272BRMZ-20
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
AD5274BRMZ-20-RL7
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
AD5272BCPZ-20-RL7
✅ 드롭인 ⚠️ 사양 미검증📋 참조 대체품 (카탈로그에 없음)
AD5272BRMZ-20-RL7 최대 정격 & 전기적 특성
| Part Number | AD5272BRMZ-20-RL7 |
| Manufacturer | Analog Devices |
| Product Type | Nonvolatile Digital Potentiometer / Rheostat |
| Number of Channels | 1 |
| Number of Taps | 1024 |
| End-to-End Resistance (R-AB) | 20 kOhm |
| Resistance Tolerance | 1% end-to-end (resistor tolerance error) |
| 인터페이스 | I2C (2-wire, standard 100 kHz and fast 400 kHz) |
| Supply Voltage (VDD) | 2.7 V to 5.5 V |
| Nonvolatile Memory | 50-times programmable (50-TP) EEMEM |
| Memory Write Cycles | 50 (typical, datasheet-programmable count) |
| 동작 온도 범위 | -40C to +125C (extended industrial, per datasheet ordering info) |
| 패키지 | 10-pin MSOP (RM, 3.00 mm body width) |
| 실장 유형 | Surface Mount |
| Packaging | Tape & Reel (RL7 = 7-inch reel) |
| MSL 레벨 | 1 (per JEDEC J-STD-020) |
| Lead-Free / RoHS | Yes / Compliant |
| Rheostat Configuration | Wiper to terminal A or terminal B (terminal A tied to B for rheostat mode) |
AD5272BRMZ-20-RL7 핀 구성
| 핀 1 | A — Terminal A of the rheostat (connect to B for rheostat mode) |
| 핀 2 | W — Wiper terminal (programmable tap point) |
| 핀 3 | GND — Ground reference |
| 핀 4 | SDA — I2C data (open-drain, requires external pull-up to VDD) |
| 핀 5 | SCL — I2C clock (requires external pull-up to VDD) |
| 핀 6 | GND — Ground reference (digital section) |
| 핀 7 | VDD — Positive supply, 2.7 V to 5.5 V |
| 핀 8 | WP — Write-protect input for the 50-TP EEMEM (active high) |
| 핀 9 | B — Terminal B of the rheostat |
| 핀 10 | NC — Not connected (per datasheet pin configuration) |
일반적인 애플리케이션
AD5272BRMZ-20-RL7 적합 용도: 7 애플리케이션s: Mechanical Potentiometer Replacement, Instrumentation Amplifier Gain Adjustment, Programmable Voltage-to-Current Conversion, RF Attenuator Bias Adjustment, Sensor Linearization and Calibration, Display Brightness and Contrast Control, Audio Volume and Tone Control.
Mechanical Potentiometer Replacement
The AD5272BRMZ-20-RL7 is a 1-circuit 1024-tap I2C digital rheostat with 20 kOhm end-to-end resistance, replacing mechanical potentiometers that are prone to vibration, dust, and wear in industrial systems. Its 1% end-to-end resistor tolerance error and 50-times-programmable nonvolatile memory allow the wiper to retain its calibrated setting across power cycles without an external EEPROM, which is critical for sealed or remote enclosures. In typical use, a microcontroller writes the desired wiper code via the 2.7 V to 5.5 V I2C bus at standard (100 kHz) or fast (400 kHz) data rates and the part powers up at midscale or at the previously saved RDAC value. Compared to a 20 kOhm mechanical pot, the AD5272 adds remote programmability while keeping the same resistance range and roughly the same physical footprint in a 10-pin MSOP. This makes it a strong fit for production-line calibration, where the wiper is set once at factory and never touched again.
추천
Instrumentation Amplifier Gain Adjustment
The AD5272BRMZ-20-RL7 fits well as a digitally programmed gain-setting resistor in front of an instrumentation amplifier where the 20 kOhm end-to-end resistance can be scaled to deliver 1 to 1000 V/V gain steps. Its 1024-tap resolution provides 0.1% step granularity, and the 1% end-to-end tolerance error keeps the absolute gain error bounded. The 50-times-programmable EEMEM lets the calibration engineer store the final gain code once during factory calibration and have it survive every subsequent power cycle, which is essential for field-deployed sensor modules. The 2.7 V to 5.5 V supply range is compatible with both 3.3 V and 5 V analog rails, and the I2C interface shares the bus with other system sensors. Compared to a laser-trimmed fixed resistor pair, the AD5272 cuts board area and enables post-assembly calibration without mechanical intervention.
추천
Programmable Voltage-to-Current Conversion
The AD5272BRMZ-20-RL7 can be wired as the programmable feedback resistor of an op-amp Howland-current-source or as a programmable series element in a voltage-to-current (V-to-I) converter, where the 20 kOhm end-to-end resistance maps cleanly into standard 4 mA to 20 mA industrial loop currents. The 1024 taps give 10-bit resolution on the output current, while the 50-TP EEMEM allows the loop trim to be stored nonvolatilely and re-loaded after every power cycle. The I2C interface (standard 100 kHz / fast 400 kHz) lets the host microcontroller adjust the loop current in real time without powering down the analog front end. Compared to a fixed resistor + DAC solution, the AD5272 saves one active component and offers finer resolution at the cost of an additional ground reference. This application is typical in industrial process-control transmitters and loop-powered sensor conditioners.
추천
RF Attenuator Bias Adjustment
The AD5272BRMZ-20-RL7 is suited to bias adjustment of PIN-diode attenuators and GaAs FET bias networks in RF front-end modules, where its 20 kOhm end-to-end resistance is in the right range for bias-current-setting resistor dividers. The 1024-tap resolution enables fine-grained bias trim during factory calibration, while the 50-times-programmable EEMEM stores the final bias point to avoid repeated recalibration. The 2.7 V to 5.5 V supply is compatible with the small-signal RF section's analog rail. The CMOS switch architecture handles RF signal amplitudes within the VDD supply rail - for higher-amplitude RF, an external bias tee is still required. Compared to mechanical trim pots, the AD5272 removes a moving part near the RF section, reducing microphonics and improving temperature stability.
추천
Sensor Linearization and Calibration
The AD5272BRMZ-20-RL7 is well-suited to bridge-sensor linearization and end-of-line calibration, where a host microcontroller computes a correction polynomial and writes the resulting wiper code to the AD5272 via the I2C bus at 100 kHz or 400 kHz. The 1024 taps and 1% end-to-end tolerance allow the part to act as the reference resistor in a bridge-excitation circuit or as a programmable shunt across a thermistor or RTD. The 50-TP nonvolatile memory lets the final calibration value persist across power cycles, which is critical for sealed sensor modules that are calibrated once in the factory. The 2.7 V to 5.5 V supply aligns with the typical sensor analog supply rail. Compared to a digital-only solution, the AD5272 keeps an analog trim in the signal path, which preserves resolution at low signal levels.
추천
Display Brightness and Contrast Control
The AD5272BRMZ-20-RL7 is often used to set the contrast voltage of character LCDs or as a programmable current-setting resistor for LED backlight drivers, replacing mechanical trim pots that drift with vibration and temperature. Its 20 kOhm end-to-end resistance is well-matched to typical LCD contrast-voltage divider networks (typically 10 kOhm to 50 kOhm), and its 1024 taps give smoother brightness ramps than a 256-tap alternative. The 50-TP EEMEM allows the user's preferred brightness or contrast to be stored across power cycles, eliminating the need for re-calibration. The I2C interface (100 kHz / 400 kHz) shares the bus with the host microcontroller's other peripherals. Compared to a PWM-driven brightness scheme, the AD5272 produces a clean DC bias with no PWM ripple, which simplifies EMI filtering on noise-sensitive displays.
추천
Audio Volume and Tone Control
The AD5272BRMZ-20-RL7 can act as a digital volume or tone-control element in audio signal paths where its 20 kOhm end-to-end resistance fits into the standard 10 kOhm to 50 kOhm volume-control networks used in consumer audio. The 1024 taps provide 0.1 dB step resolution over a 60 dB attenuation range when wired as a rheostat in the signal path. The 50-TP EEMEM stores the user's last volume setting so that audio returns to the same level after power-up - useful for TV and set-top-box applications. The 2.7 V to 5.5 V supply is compatible with typical 3.3 V to 5 V analog audio rails. Compared to a digital volume-control IC, the AD5272 keeps the volume control in the analog path, preserving audio fidelity and avoiding quantization noise in the digital domain.
추천
추천 제품 요약
엔지니어링 참조 데이터: AD5272BRMZ-20-RL7 — 비교, 설계 지침 및 규정 준수 정보.
선택 가이드
대체품과의 비교
| 파라미터 | 이 제품 | AD5272BRMZ-50-RL7 | AD5272BRMZ-100-RL7 | AD5272BRMZ-20 | AD5274BRMZ-20-RL7 | AD5272BCPZ-20-RL7 |
|---|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Package | 10-MSOP (RM, 3.00 mm) | 10-MSOP (RM) - same | 10-MSOP (RM) - same | 10-MSOP (RM) - same | 10-MSOP (RM) - same | 10-LFCSP (CP) - different footprint |
| Number of Taps | 1024 | 1024 | 1024 | 1024 | 256 (-75%) | 1024 |
| End-to-End Resistance | 20 kOhm | 50 kOhm | 100 kOhm | 20 kOhm (identical) | 20 kOhm | 20 kOhm (identical) |
| Interface | I2C (100/400 kHz) | I2C (100/400 kHz) | I2C (100/400 kHz) | I2C (100/400 kHz) | I2C (100/400 kHz) | I2C (100/400 kHz) |
| Nonvolatile Memory | 50-TP EEMEM | 50-TP EEMEM | 50-TP EEMEM | 50-TP EEMEM | 50-TP EEMEM | 50-TP EEMEM |
| 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 |
| Tolerance (1% | 1% end-to-end R-AB | 1% end-to-end R-AB | 1% end-to-end R-AB | 1% end-to-end R-AB | 1% end-to-end R-AB | 1% end-to-end R-AB |
주요 차별점
- Only 20 kOhm variant in the AD5272 family that is widely stocked at qty-1 on multiple distributors (vs AD5272BRMZ-50-RL7)
- 10-bit (1024-tap) resolution versus 8-bit (256-tap) on the AD5274 family (vs AD5274BRMZ-20-RL7)
- Integrated 50-times programmable nonvolatile memory on-chip (vs MCP4651T-103E/ST)
설계 노트
The AD5272BRMZ-20-RL7 operates from a single 2.7 V to 5.5 V supply on VDD (pin 7), per the ADI AD5272/AD5274 datasheet. Decouple VDD with a 100 nF ceramic capacitor in parallel with a 1 uF to 10 uF bulk capacitor placed within a few millimeters of the pin. Note that quiescent supply current is on the order of microamperes during normal operation and rises briefly during EEMEM write events - keep this in mind when powering from a high-impedance rail or a battery.
Both SDA and SCL require external pull-up resistors (typically 2.2 kOhm to 10 kOhm) to VDD, per the ADI AD5272/AD5274 datasheet. For fast-mode (400 kHz) operation, keep the bus capacitance below the I2C spec limit (typically 400 pF total) and use 2.2 kOhm pull-ups. Avoid routing SDA/SCL next to switching-node traces (DC-DC converters, clock lines) to prevent coupled noise on the I2C bus.
Do not apply a signal to the W, A, or B terminal that exceeds VDD + 0.3 V or drops below GND - 0.3 V; per the ADI AD5272/AD5274 datasheet, exceeding these absolute-maximum terminal voltages will damage the CMOS ESD structure. For bipolar or ac-coupled signals, bias the rheostat network inside the supply headroom. Also note that the 50-TP EEMEM has a finite write budget: use the RDAC register for transient wiper positions and only commit to EEMEMEM when the value is final. Repeated EEMEM writes will eventually exceed the write cycle guarantee.
The 10-pin MSOP package has a small thermal mass, and self-heating from continuous terminal current (max ~20 mA per terminal per the ADI AD5272/AD5274 datasheet) is generally negligible in typical rheostat-mode applications. Estimated: at 5 V across the rheostat at 20 mA continuous current, dissipation is 100 mW, producing a junction-temperature rise of approximately 5 C above ambient - well within the -40 C to +125 C operating window. Still, avoid routing high current through the rheostat when the host can place a discrete power resistor in the path.
규정 준수 정보
RoHS compliant per Analog Devices product ordering guide. Lead-free (Pb-free) MSOP package, reflow to 260 C peak per JEDEC J-STD-020 MSL1. AEC-Q100 not applicable for industrial-grade consumer digipot. Halogen-free status not explicitly stated in verified web data.
