AD5174BRMZ-10 - 10kΩ 1024-Tap SPI Digital Rheostat | Analog Devices
부품 번호: AD5174BRMZ-10 ✓ 활성| 수량 | 단가 | 합계 |
|---|---|---|
| 1 | $4.52 | $4.52 |
| 10 | $4.07 | $40.70 |
| 100 | $3.62 | $362.00 |
| 500 | $3.26 | $1,630.00 |
| 1,000 | $2.89 | $2,890.00 |
AD5174BRMZ-10 개요
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.
드롭인 대체품: AD5174BRMZ-10 — 동일 패키지, 핀 호환. PCB 재작업이 필요한 다른 패키지 부품은 제외됩니다.
빠른 비교 도구 — 나란히 비교할 대체 부품을 선택하십시오:
AD5174BRMZ-10-RL7
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
AD5174BRMZ-50
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
AD5174BRMZ-100
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
AD5174BRMZ-5
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
AD5174BRMZ-10 사양
| Part Number | AD5174BRMZ-10 |
| Manufacturer | Analog Devices Inc. |
| Product Type | Single-Channel Digital Rheostat (Digital Potentiometer) |
| Number of Channels | 1 |
| Number of Taps | 1024 |
| Nominal End-to-End Resistance (R-AB) | 10 kΩ |
| Resistance Tolerance | ±5 kΩ max (in-package tolerance) |
| 인터페이스 | SPI (3-wire serial, up to 25 MHz) |
| Nonvolatile Memory | Yes - 50-times programmable (50-TP) |
| Supply Voltage - Single | 2.7 V to 5.5 V |
| Supply Voltage - Dual | ±2.5 V to ±2.75 V |
| INL (max) | ±2 LSB |
| DNL (max) | ±1 LSB |
| 동작 온도 | -40 °C to +125 °C (extended industrial) |
| 패키지 / 케이스 | 10-MSOP (RM-10 suffix), 3 mm × 3 mm |
| 실장 유형 | Surface Mount |
| MSL 레벨 | 1 (Unlimited) - per PartGenie listing |
| RoHS Compliance | ROHS3 Compliant |
| REACH Status | REACH Unaffected - per PartGenie listing |
AD5174BRMZ-10 핀 구성
| 핀 1 | SCLK — SPI serial clock input |
| 핀 2 | SYNC — SPI frame sync (active low, chip select equivalent) |
| 핀 3 | SDIN — SPI serial data input |
| 핀 4 | SDO — SPI serial data output (open-drain; requires pull-up) |
| 핀 5 | GND — Ground reference |
| 핀 6 | VDD — Positive supply |
| 핀 7 | VSS — Negative supply or GND in single-supply mode |
| 핀 8 | A — Terminal A of the rheostat (R-AB high side) |
| 핀 9 | W — Wiper terminal of the rheostat |
| 핀 10 | B — Terminal B of the rheostat (R-AB low side) |
일반적인 애플리케이션
AD5174BRMZ-10 적합 용도: 6 애플리케이션s: Precision Gain Calibration in Instrumentation Amplifiers, LCD Display Contrast / Brightness Adjustment, Programmable Voltage Reference / Divider Bias, Audio Attenuator / Volume Control, Laser Diode Bias Trimming, Industrial Control Calibration & Field Trim.
Precision Gain Calibration in Instrumentation Amplifiers
The AD5174BRMZ-10 fits instrumentation-amplifier gain calibration because its 1024 taps give ~10-bit resolution and the 10 kΩ end-to-end resistance matches the typical feedback network impedance of three-op-amp INA designs. With DNL ±1 LSB and INL ±2 LSB max, the part provides monotonic behavior critical for closed-loop gain trim. Its 50-times programmable NVM lets the factory store the calibrated gain permanently, avoiding per-boot microcontroller re-trim. Compared to a mechanical pot, the AD5174BRMZ-10 eliminates vibration-induced drift and human tuning labor.
추천
LCD Display Contrast / Brightness Adjustment
The AD5174BRMZ-10 suits LCD contrast adjustment because the SPI interface lets the host microcontroller write the contrast level on the fly while the 50-TP NVM retains the user-preferred setting across power cycles. Operating from 2.7 V to 5.5 V, it drives the contrast pin of character LCDs or the backlight-current-set pin of TFTs directly through a follower op-amp. The 10 kΩ resistance and 1024-step resolution yield ~9.77 Ω per step, finer than typical mechanical contrast trimmers and enabling smooth, software-driven contrast curves.
추천
Programmable Voltage Reference / Divider Bias
The AD5174BRMZ-10 works as a programmable low-side resistor in a precision reference divider because its 10 kΩ resistance and 1024 taps give ~0.1% step size for bias voltage trimming. The wiper current must stay within ±6 mA per the datasheet; in bias-rail applications the actual current is well below this limit. Combined with a low-noise reference like the ADR01, the AD5174BRMZ-10 enables factory-set calibration of a precision rail without mechanical adjustment, ideal for automated test equipment.
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Audio Attenuator / Volume Control
The AD5174BRMZ-10 serves as a digital audio attenuator when paired with an op-amp follower or in a shunt-mode configuration. Its dual-supply support (±2.5 V to ±2.75 V) enables ground-referenced audio signal handling, eliminating DC-blocking concerns. The 10 kΩ end-to-end value and 1024-step resolution provide ~0.1 dB logarithmic approximation when paired with a software dB-to-tap table. Compared to a mechanical volume pot, the AD5174BRMZ-10 gives clickless, software-controlled, and nonvolatile-preset volume.
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Laser Diode Bias Trimming
The AD5174BRMZ-10 is appropriate for laser-diode bias trimming where the threshold current must be set to a precise value at factory calibration. Its 50-TP NVM retains the trim value in the field; SPI control lets an FPGA or microcontroller tune the bias in real time. The 10 kΩ end-to-end value is well-suited to bias-current-set resistor values of typical laser-driver ICs. Compared to mechanical trim pots, the AD5174BRMZ-10 eliminates vibration-induced laser-power drift, which is critical in fiber-optic and LiDAR systems.
추천
Industrial Control Calibration & Field Trim
The AD5174BRMZ-10 fits industrial-control calibration loops where PLCs or microcontroller-based controllers need to set a process variable (gain, offset, threshold) without mechanical access. Its 2.7 V–5.5 V single-supply range matches 3.3 V and 5 V industrial logic rails, and the 50-TP NVM lets the calibration survive brown-outs and power cycles in unattended installations. The SPI interface enables diagnostics logging of the trim value. Compared to mechanical trim pots in field enclosures, the AD5174BRMZ-10 eliminates dust ingress and vibration-induced drift.
추천
추천 제품 요약
엔지니어링 참조 데이터: AD5174BRMZ-10 — 비교, 설계 지침 및 규정 준수 정보.
선택 가이드
대체품과의 비교
| 파라미터 | 이 제품 | AD5174BRMZ-10-RL7 | AD5174BRMZ-50 | AD5174BRMZ-100 | AD5174BRMZ-5 | AD5142ABCPZ10-RL7 |
|---|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Package | 10-MSOP | 10-MSOP - same | 10-MSOP - same | 10-MSOP - same | 10-MSOP - same | 16-LFCSP - different |
| End-to-End Resistance | 10 kΩ | 10 kΩ | 50 kΩ | 100 kΩ | 5 kΩ | 10 kΩ |
| Number of Taps | 1024 | 1024 | 1024 | 1024 | 1024 | 256 |
| Interface | SPI | SPI | SPI | SPI | SPI | I²C |
| Nonvolatile Memory | 50-TP EEPROM | 50-TP EEPROM | 50-TP EEPROM | 50-TP EEPROM | 50-TP EEPROM | Higher-endurance NVM |
| Supply Voltage (Single) | 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 |
| Reel Quantity | 3000 (13-inch) | 1000 (7-inch) | 3000 (13-inch) | 3000 (13-inch) | 3000 (13-inch) | 5000 (13-inch) |
주요 차별점
- Highest tap count in the AD51xx family at 10 kΩ (vs AD5142ABCPZ10-RL7 (256 taps))
- Same-package alternative for higher-resistance design (vs AD5174BRMZ-50 (50 kΩ))
- Standard 13-inch reel packaging variant available (vs AD5174BRMZ-10-RL7 (7-inch reel))
설계 노트
Decouple VDD with a 0.1 µF ceramic capacitor placed within 3 mm of pin 6 (VDD) and VSS (pin 7) to GND. In dual-supply mode, also decouple pin 7 (VSS) with a 0.1 µF cap to pin 5 (GND). For noisy system rails, add a 10 µF tantalum or ceramic bulk capacitor in parallel. Per the Analog Devices AD5174 datasheet, supply rise time must be monotonic to avoid unintended EEPROM writes; use a power-good supervisory circuit or enable sequence if the host cannot guarantee monotonic VDD.
Do not exceed the wiper current limit of ±6 mA continuous (per the AD5174 datasheet absolute maximum ratings); sustained over-current causes long-term drift of the polysilicon resistor string. When using the rheostat in a high-current path, place a series buffer resistor or op-amp follower so the wiper sees <1 mA. Also, the SDO pin is open-drain and requires an external pull-up (typically 10 kΩ to VDD); omitting this pull-up results in the SDO line floating and unreliable SPI read-back.
Route SPI traces (SCLK, SYNC, SDIN, SDO) as short as possible and keep them away from switching converter or motor-drive traces to avoid capacitive coupling noise. Place a ground plane beneath the AD5174BRMZ-10 to provide a low-impedance return for SPI currents. The 10-MSOP thermal pad (pin 11, EP) must be soldered to the PCB ground plane to keep junction temperature within the -40 °C to +125 °C operating range; an unsoldered thermal pad can lead to localized heating under high-wiper-current conditions.
For applications where the rheostat is in a high-impedance node (e.g., a CMOS op-amp reference input), add a 100 pF to 1 nF capacitor from the wiper to GND to filter the charge-injection transient that occurs on each tap switch. Charge injection in the AD5174 is specified in the datasheet; using the suggested filter reduces glitch amplitude by an order of magnitude and prevents downstream ADC misreads in instrumentation loops.
규정 준수 정보
ROHS3 Compliant and REACH Unaffected per PartGenie listing. AEC-Q100 not applicable - this is a data-acquisition IC not designed for automotive. Lead-free confirmed via MSL1 rating. Halogen-free and conflict-mineral status not explicitly stated in available data.
