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Analog Devices Inc. AD5274BRMZ-20
- Part No.:
- AD5274BRMZ-20
- Manufacturer:
- Analog Devices Inc.
- Category:
- Digital Potentiometers
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
AD5274BRMZ-20.pdf
- Description:
- IC DGTL POT 20KOHM 256TAP 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:531
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Product details
Overview
AD5274BRMZ-20 from Analog Devices is a single-channel, 256-position digital rheostat with 20 kΩ nominal resistance, ±1% end-to-end resistor tolerance error, I²C interface, and 50-times programmable (50-TP) nonvolatile wiper memory. It operates from 2.7 V to 5.5 V single supply or ±2.5 V dual supply, features 5 ppm/°C temperature coefficient in rheostat mode, and is used for precision gain control in op-amp circuits and sensor calibration.
For engineers reviewing the AD5274BRMZ-20 datasheet, AD5274BRMZ-20 pinout, AD5274BRMZ-20 application, or AD5274BRMZ-20 equivalent, key selection considerations include its 8-bit resolution, guaranteed 1% resistor tolerance in R-Perf mode, 300 kHz bandwidth at 20 kΩ, wiper readback capability, and LFCSP-10 (3 mm × 3 mm) package compatibility with high-density industrial PCB layouts.
Technical Context
The AD5274BRMZ-20 implements a segmented resistor ladder architecture with digitally controlled switch matrix, enabling precise wiper positioning across 256 discrete taps. Its RDAC register serves as volatile scratchpad memory, while the 50-TP fuse-based NVM retains wiper settings across power cycles without external backup.
It supports standard (100 kHz) and fast-mode (400 kHz) I²C communication with 7-bit address (0x5C/0x5E/0x5D via ADDR pin), write-protected memory programming, and hardware reset via active-low RESET pin. Dual-supply operation (±2.5 V) enables bipolar signal adjustment with ground-referenced terminals A and W.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 8 bits - Enables 256 discrete resistance steps for fine-grained analog tuning. |
| Nominal Resistance | 20 kΩ - Defines full-scale end-to-end resistance; sets current range and gain scaling in feedback networks. |
| Resistor Tolerance Error | ±1% (R-Perf mode) - Guarantees absolute resistance accuracy without calibration, critical for open-loop gain setting. |
| Temperature Coefficient | 5 ppm/°C - Ensures stable resistance over −40°C to +125°C, minimizing drift in precision instrumentation. |
| Bandwidth | 300 kHz (at 20 kΩ, terminal W) - Supports audio-frequency and DC-coupled analog signal adjustment without phase loss. |
| Supply Range | 2.7 V to 5.5 V single supply or ±2.5 V dual supply - Enables use in both low-voltage embedded systems and bipolar signal conditioning. |
| Wiper Memory | 50-TP (50-times programmable) - Allows permanent storage of calibrated wiper positions; no battery or EEPROM required. |
Pinout & Package
AD5274BRMZ-20 is housed in a thin 10-lead LFCSP package (3 mm × 3 mm × 0.8 mm) with exposed pad (EPAD), optimized for thermal performance (θJA = 58.4°C/W) and high-density layout. Pin functions are validated per Analog Devices Rev. G datasheet Figure 5 and Table 10.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Positive power supply | Must be decoupled with 0.1 µF ceramic + 10 µF bulk capacitor; powers internal logic and switches. |
| A | RDAC terminal A | One end of variable resistor; voltage range: VSS ≤ VA ≤ VDD; connects to op-amp feedback node or reference path. |
| W | Wiper terminal | Adjustable tap point; supports readback via I²C; max continuous current ±3 mA at 20 kΩ. |
| VSS | Negative supply / GND | 0 V for single supply; −2.5 V for dual supply; decoupling identical to VDD; defines lower rail for bipolar operation. |
| EXT_CAP | External capacitor connection | Requires 1 µF ≥7 V capacitor to VSS; stabilizes internal charge pump during 50-TP programming. |
| GND | Logic ground reference | Separate from power ground in mixed-signal designs; minimizes digital noise coupling into analog path. |
| RESET | Hardware reset input | Active-low; restores RDAC register from 50-TP memory on power-up or manual trigger; tie to VDD if unused. |
| SDA | I²C bidirectional data line | Open-drain; requires external pull-up; supports read/write of RDAC register, 50-TP memory, and control register. |
| SCL | I²C clock input | Drives serial interface timing; compatible with 100 kHz / 400 kHz modes; rise/fall time specified per Table 7. |
| ADDR | I²C address LSB input | Configures two LSBs of 7-bit address (0x5C/0x5D/0x5E); enables up to three devices on same I²C bus. |
Key Features
| Feature | Design Value |
|---|---|
| 1% end-to-end resistor tolerance (R-Perf mode) | Eliminates need for system-level trimming in gain-setting applications; enables direct replacement of mechanical potentiometers. |
| 50-TP nonvolatile wiper memory | Stores one calibrated wiper position permanently; survives >100,000 power cycles; no external NVM or battery required. |
| I²C wiper readback | Allows real-time verification of programmed resistance value; essential for closed-loop calibration and fault diagnostics. |
| Rheostat-mode tempco: 5 ppm/°C | Reduces resistance drift to <±0.06% over −40°C to +125°C; maintains accuracy in automotive and industrial environments. |
| Dual-supply operation (±2.5 V) | Supports true bipolar signal adjustment (e.g., AC-coupled op-amp gain control) with ground-referenced A and W terminals. |
Applications
| Op-Amp Gain Control | Sensor Calibration |
|---|---|
|
Use Scenario: Programmable gain stage in precision instrumentation amplifier using AD8421 or similar. IC Role / Device Role / Timing Role: Rheostat connected in op-amp feedback loop to set closed-loop gain; wiper position updated dynamically via I²C during system self-test. Use Value: Replaces mechanical trimmer with factory-calibrated 1% resistance; eliminates manual adjustment and long-term drift in field-deployed equipment. |
Use Scenario: Offset and span adjustment for RTD or thermocouple front-end in industrial temperature transmitter. IC Role / Device Role / Timing Role: Configures reference voltage divider and sensor bridge excitation; 50-TP memory stores final calibration coefficients after production test. Use Value: Enables one-time, irreversible calibration storage; ensures repeatability across product lifetime without recalibration intervals. |
| Programmable Power Supply | Programmable Filter Tuning |
|
Use Scenario: Adjustable output voltage in digitally controlled DC-DC converter feedback network (e.g., LTC3891). IC Role / Device Role / Timing Role: Sets voltage divider ratio for error amplifier reference; updated via microcontroller I²C during mode switching or load compensation. Use Value: Achieves ±0.5% output accuracy over line/load/temp without DAC or external reference; simplifies BOM and layout. |
Use Scenario: Center-frequency tuning in active low-pass filter for anti-aliasing in data acquisition systems. IC Role / Device Role / Timing Role: Adjusts RC time constant in Sallen-Key topology; wiper position selected based on sampling rate configuration. Use Value: Maintains filter cutoff stability over temperature (5 ppm/°C) and supply variation (PSRR −66 dB at 20 kΩ), reducing post-processing correction. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digital rheostat applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD5272BRMZ-20 | 1024-position (10-bit) resolution vs. 256-position (8-bit); otherwise identical architecture, tolerance, and package. | Better resolution for fine-tuning applications (e.g., laser diode bias control); higher code granularity increases I²C transaction overhead. | Select AD5272BRMZ-20 when sub-0.4% step resolution is required; AD5274BRMZ-20 preferred for cost-sensitive, lower-resolution gain control. |
| MCP45HV51-203 | Single-channel, 256-tap, 20 kΩ; SPI interface; ±20% initial tolerance; no nonvolatile memory; 14-pin TSSOP package. | Lacks 50-TP memory and 1% tolerance guarantee; requires external MCU firmware to restore settings after power loss. | Choose MCP45HV51-203 only if SPI is mandated and calibration retention is handled externally; AD5274BRMZ-20 provides superior accuracy and autonomy. |
Compared with AD5272BRMZ-20, AD5274BRMZ-20 trades resolution for reduced command latency and simpler firmware handling; versus MCP45HV51-203, it delivers guaranteed 1% tolerance and autonomous power-on restore-critical for unattended industrial systems.
Availability
AD5274BRMZ-20 is available at Aetrix Electronics and suitable for industrial sensor calibration, programmable power supplies, op-amp gain control, and precision instrumentation requiring stable component supply across extended temperature ranges (−40°C to +125°C).
Supply support for AD5274BRMZ-20 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Analog Devices, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, communications, automotive, and healthcare markets.
The AD5272/AD5274 family was designed specifically for replacing mechanical potentiometers in high-reliability, calibration-critical applications where guaranteed resistor tolerance, nonvolatile storage, and wide temperature operation are mandatory.
FAQ
What is the guaranteed resistor tolerance of AD5274BRMZ-20, and under what conditions does it apply?
The AD5274BRMZ-20 guarantees ±1% end-to-end resistor tolerance in Resistor Performance (R-Perf) mode, confirmed across codes 0x1E–0xFF at |VDD − VSS| = 4.5 V to 5.5 V (Table 5). This specification applies only in R-Perf mode-not Normal mode (±15%)-and is validated over −40°C to +125°C. The AD5274BRMZ-20 achieves this via patented trimming architecture, eliminating need for external calibration in gain-setting circuits.
Does AD5274BRMZ-20 support dual-supply operation, and what are the voltage limits?
Yes, AD5274BRMZ-20 supports dual-supply operation at ±2.5 V to ±2.75 V (VDD = +2.5 V, VSS = −2.5 V), enabling true bipolar signal adjustment with ground-referenced terminals A and W. Terminal voltage range remains VSS ≤ VA, VW ≤ VDD, and common-mode leakage is limited to 50 nA. This allows use in AC-coupled op-amp configurations without level-shifting circuitry-confirmed in Table 4 and General Description.
How does the 50-TP memory function in AD5274BRMZ-20, and what is its programming endurance?
The 50-TP memory in AD5274BRMZ-20 uses fuse-based nonvolatile storage allowing exactly 50 permanent wiper position writes. Each program cycle takes ~350 ms and draws 4 mA peak current (Table 4). Once programmed, the wiper automatically reloads from 50-TP memory at power-up (tPOWER-UP = 2 ms). The AD5274BRMZ-20 does not support reprogramming-each write is irreversible-making it ideal for factory-set calibration points.
Can AD5274BRMZ-20 be used in high-frequency signal paths, and what is its bandwidth limitation?
Yes, AD5274BRMZ-20 supports analog signal adjustment up to 300 kHz (−3 dB, 20 kΩ, terminal W) as measured per Figure 41. Bandwidth scales inversely with resistance: 120 kHz at 50 kΩ, 60 kHz at 100 kΩ. Total harmonic distortion is −90 dB at 1 kHz (20 kΩ), and resistor noise density is 13 nV/√Hz-validated in Tables 4 and 7. These specs confirm suitability for audio-band and precision DC applications, but not RF or MHz-range signals.
What package type and thermal characteristics does AD5274BRMZ-20 have?
AD5274BRMZ-20 uses a 10-lead LFCSP package (3 mm × 3 mm × 0.8 mm) with exposed pad (EPAD), specified in Outline Dimensions (p.26) and Thermal Resistance Table 9 (θJA = 58.4°C/W). The EPAD may be left floating or tied to VSS. This compact, thermally efficient package supports high-density routing and meets JEDEC JESD-51 standards-critical for industrial modules operating continuously at +125°C ambient.
AD5274BRMZ-20 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Programmable:
- Not Verified
- Taper:
- Linear
- Configuration:
- Rheostat
- Number of Circuits:
- 1
- Number of Taps:
- 256
- Resistance (Ohms):
- 20k
- Interface:
- I2C
- Memory Type:
- Non-Volatile
- Voltage - Supply:
- 2.7V ~ 5.5V, ±2.5V ~ 2.75V
- Features:
- Selectable Address
- Tolerance:
- ±1%
- Temperature Coefficient (Typ):
- 5ppm/°C
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 10-MSOP
- Operating Temperature:
- -40°C ~ 125°C
- Resistance - Wiper (Ohms) (Typ):
- 35
AD5274BRMZ-20 FAQ
1.How can I place an order for AD5274BRMZ-20 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD5274BRMZ-20 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for AD5274BRMZ-20 reliable?
The price and inventory of AD5274BRMZ-20 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD5274BRMZ-20 is usually 5 days.
3.What payment methods are accepted for AD5274BRMZ-20?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD5274BRMZ-20 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD5274BRMZ-20?
AD5274BRMZ-20 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD5274BRMZ-20 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for AD5274BRMZ-20?
For technical support, including AD5274BRMZ-20 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD5274BRMZ-20 requirements.
6.How does Aetrix verify that AD5274BRMZ-20 is sourced from the original manufacturer or authorized distributors?
All AD5274BRMZ-20 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that AD5274BRMZ-20 meets industry standards.
7.What is the process for return or replacement of AD5274BRMZ-20?
All AD5274BRMZ-20 units undergo pre-shipment inspection (PSI). If there is an issue with AD5274BRMZ-20, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The AD5274BRMZ-20 part is unused and in its original packaging.
Return procedure for AD5274BRMZ-20:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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