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Analog Devices Inc. AD5231BRUZ100-RL7
- Part No.:
- AD5231BRUZ100-RL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Digital Potentiometers
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
AD5231BRUZ100-RL7.pdf
- Description:
- IC DGTL POT 100KOHM 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,718
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Product details
Overview
AD5231BRUZ100-RL7 from Analog Devices is a nonvolatile digital potentiometer with 1024-position resolution, 100 kΩ terminal resistance, SPI-compatible serial interface, and embedded EEPROM for wiper setting retention. It replaces mechanical potentiometers in precision gain/offset adjustment, programmable filters, and sensor calibration circuits operating from −40°C to +85°C.
For engineers reviewing the AD5231BRUZ100-RL7 datasheet, AD5231BRUZ100-RL7 pinout, AD5231BRUZ100-RL7 application, or AD5231BRUZ100-RL7 equivalent, key selection criteria include EEMEM restore time (140 µs), ±6 dB log taper control, 28 bytes of user-configurable nonvolatile memory, and dual-supply (±2.5 V) or single-supply (3 V to 5 V) operation compatibility.
Technical Context
The AD5231BRUZ100-RL7 implements a 10-bit RDAC architecture with scratchpad register and separate EEMEM storage, enabling power-on automatic wiper refresh and dynamic restore via PR pin or Instruction 1. Its SPI interface supports CPHA = 0/1 and CPOL = 0/1 modes with 24-bit command framing and daisy-chain capability.
It operates in both rheostat (W–B or W–A) and potentiometer divider (A–W–B) configurations, with guaranteed monotonicity, 15 ppm/°C voltage divider temperature coefficient, and 370 kHz / 85 kHz / 44 kHz bandwidth for 10 kΩ / 50 kΩ / 100 kΩ versions respectively - confirming AD5231BRUZ100-RL7's optimized performance at its rated 100 kΩ RAB.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 10-bit (1024 positions): enables precise 0.1% step resolution across full scale for fine-tuning analog signal paths. |
| Terminal Resistance (RAB) | 100 kΩ ±20%: defines maximum end-to-end resistance; sets current-handling limit (±2 mA continuous) and bandwidth (44 kHz @ −3 dB). |
| EEMEM Restore Time | 140 µs typical: ensures rapid, deterministic wiper initialization at power-up without system-level delay penalties. |
| Supply Range | 3 V to 5.5 V single-supply or ±2.25 V to ±2.75 V dual-supply: supports direct interfacing with 3.3 V/5 V logic and bipolar analog signal conditioning. |
| Nonvolatile Memory Endurance | 100,000 write cycles: guarantees long-term field reliability for recalibration routines executed monthly over >8 years. |
| Data Retention | 100 years at TJ = 55°C: ensures permanent storage of factory or field calibration values without periodic refresh. |
| Interface | SPI-compatible 4-wire (CLK, SDI, SDO, CS): enables direct connection to microcontrollers without protocol translation or glue logic. |
Pinout & Package
AD5231BRUZ100-RL7 is housed in a 16-lead TSSOP package (4.4 mm × 5.0 mm, 0.65 mm pitch), rated for −40°C to +85°C operation and compatible with standard reflow profiles (260°C peak, 20–40 sec).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| O1 | Nonvolatile digital output 1 | User-programmable latched output; retains state through power cycles; ADDR = 0x1, D0 bit position. |
| CLK | Serial clock input | Positive-edge-triggered SPI clock; supports up to 50 MHz operation per timing specs (tCYC ≥ 20 ns). |
| SDI | Serial data input | MSB-first 24-bit command/data input; accepts instructions, addresses, and wiper codes per Table 6/7. |
| SDO | Serial data output | Open-drain output for readback (Instructions 9/10) or daisy-chain forwarding; requires 1–10 kΩ pull-up. |
| GND | Digital ground reference | Logic ground for all digital I/O; must be tied to PCB common ground, separate from analog return if noise-sensitive. |
| VSS | Negative supply rail | 0 V for single-supply use; −2.5 V for dual-supply bipolar operation; sinks 40 mA during EEMEM store. |
| B | RDAC terminal B | Fixed end of resistive ladder; used with W in rheostat mode or as low-side reference in divider mode. |
| W | Wiper terminal | Variable tap point; connects to internal switch matrix; voltage range limited to VSS ≤ VW ≤ VDD. |
| A | RDAC terminal A | Fixed end of resistive ladder; used with W in rheostat mode or as high-side reference in divider mode. |
| VDD | Positive supply rail | 3–5.5 V supply; powers core logic and RDAC switches; supplies 2.7–10 µA quiescent current. |
| WP | Write protect input | Active-low hardware lock: prevents EEMEM writes except PR, Instruction 1, and Instruction 8. |
| PR | Preset input | Hardware override: rising edge reloads RDAC from EEMEM; factory default = midscale (512). |
| CS | Chip select input | Active-low enable for serial register; must remain low for full 24-bit frame; pulses trigger command decode. |
| RDY | Ready indicator | Open-drain active-high flag signaling completion of EEMEM store/restore (Instructions 2,3,8,9,10,PR). |
| O2 | Nonvolatile digital output 2 | Second user-programmable latched output; ADDR = 0x1, D1 bit position; independent of O1 state. |
Key Features
| Feature | Design Value |
|---|---|
| 1024-step resolution with monotonicity guarantee | Ensures glitch-free, predictable analog tuning across full scale - critical for closed-loop control and calibration stability. |
| ±6 dB/step log taper increment/decrement | Enables exponential gain scaling for audio volume control and sensor response linearization without MCU math overhead. |
| 28 bytes of user EEMEM | Stores system ID, calibration coefficients, or lookup tables alongside wiper settings - eliminating external NVM components. |
| Power-on EEMEM auto-refresh | Eliminates boot-time initialization code; wiper assumes last-saved value immediately on VDD stabilization. |
| Permanent EEMEM write protection (WP pin) | Prevents accidental overwrites during field updates or firmware resets - essential for safety-critical recalibration locks. |
| Hardware preset (PR pin) with midscale default | Provides fail-safe wiper recovery path independent of software; factory default ensures known startup state. |
Applications
| Instrumentation Gain Adjustment | Sensor Calibration |
|---|---|
Use Scenario: Programmable gain stage in precision data acquisition front-ends where offset drift must be nulled and gain scaled per sensor unit. IC Role / Device Role / Timing Role: AD5231BRUZ100-RL7 serves as digitally controlled feedback resistor in op-amp noninverting configuration, adjusting closed-loop gain from 1× to 100×. Use Value: Eliminates manual trim pots; enables automated factory calibration via SPI and retains settings across power cycles using EEMEM. | Use Scenario: Linearizing thermistor or RTD output in environmental monitoring nodes deployed for multi-year unattended operation. IC Role / Device Role / Timing Role: AD5231BRUZ100-RL7 configures bridge excitation voltage and adjusts reference leg in Wheatstone configuration to compensate for unit-to-unit sensor variance. Use Value: Stores per-unit calibration coefficients in 28-byte EEMEM; achieves <0.1% linearity error without external memory or host intervention. |
| Programmable Power Supply | Programmable Filter Tuning |
Use Scenario: Adjustable benchtop power supply with remote setpoint control and persistent voltage/current limits stored across reboots. IC Role / Device Role / Timing Role: AD5231BRUZ100-RL7 sets reference voltage for DAC-controlled pass transistor gate or feedback node in switching regulator error amplifier. Use Value: Maintains user-defined output level after AC cycle loss; supports ±2.5 V dual-supply operation for true bipolar output ranges. | Use Scenario: Adaptive anti-aliasing or reconstruction filter in portable medical devices requiring frequency response adjustment based on sampling rate. IC Role / Device Role / Timing Role: AD5231BRUZ100-RL7 tunes RC time constant in Sallen-Key topology by varying R in series with fixed C, shifting cutoff from 1 kHz to 10 kHz. Use Value: Achieves 10:1 frequency range with <1% tolerance drift; uses log-taper commands for perceptually uniform step changes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digital potentiometer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD5232BRUZ100-RL7 | Dual-channel version with identical 100 kΩ RAB, 1024-step resolution, and EEMEM; adds second independent RDAC channel. | Required when two independent programmable resistances are needed in same footprint (e.g., dual-gain instrumentation amp). | Select AD5232BRUZ100-RL7 only if dual-channel functionality is required; AD5231BRUZ100-RL7 offers lower cost and reduced complexity for single-resistor needs. |
| MCP42100-E/ST | Single-channel, 100 kΩ, 256-step (8-bit) resolution; SPI interface; volatile wiper RAM only (no EEMEM); 1.8–5.5 V supply. | Suitable for cost-sensitive, non-critical applications where power-cycle wiper retention is unnecessary. | Choose MCP42100-E/ST for budget-limited designs without nonvolatile requirement; AD5231BRUZ100-RL7 is mandatory where calibration persistence is essential. |
Compared with AD5232BRUZ100-RL7, AD5231BRUZ100-RL7 reduces board area and BOM count for single-resistor systems; versus MCP42100-E/ST, it delivers 4× higher resolution and eliminates host-based wiper reinitialization at every power-up.
Availability
AD5231BRUZ100-RL7 is available at Aetrix Electronics and suitable for instrumentation gain adjustment, sensor calibration, and programmable power supply designs requiring stable component supply, long-term calibration retention, and industrial temperature operation.
Supply support for AD5231BRUZ100-RL7 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, automotive, communications, and healthcare markets since 1965.
The AD5231 belongs to Analog Devices' precision digital potentiometer product line, engineered for applications demanding nonvolatile wiper storage, monotonic operation, and robust SPI control in harsh environments.
FAQ
What is the terminal resistance tolerance for AD5231BRUZ100-RL7?
The AD5231BRUZ100-RL7 has a nominal terminal resistance (RAB) of 100 kΩ with a tolerance of −40% to +20%, as specified in Table 1 of the Rev. E datasheet. This tolerance reflects process variation across temperature and applies to the end-to-end resistance between Terminals A and B at code 0x3FF. The device maintains monotonicity and guaranteed linearity despite this initial tolerance.
Does AD5231BRUZ100-RL7 support dual-supply operation?
Yes, AD5231BRUZ100-RL7 supports dual-supply operation from ±2.25 V to ±2.75 V. In this mode, VDD = +2.5 V and VSS = −2.5 V, enabling true bipolar signal adjustment with VA, VB, and VW referenced to ground. Terminal voltage compliance remains within VSS − 0.3 V to VDD + 0.3 V, and dynamic characteristics (e.g., bandwidth, THD) are characterized under dual-supply conditions.
How does the WP pin function on AD5231BRUZ100-RL7?
The WP (Write Protect) pin on AD5231BRUZ100-RL7 is an active-low input that disables all EEMEM write operations when asserted, except for Instruction 1 (EEMEM restore), Instruction 8 (EEMEM restore), and the PR hardware pulse. To re-enable writes, a NOP instruction must be issued before returning WP to logic high. This provides hardware-level protection against unintended calibration overwrites.
Can AD5231BRUZ100-RL7 be used in rheostat mode?
Yes, AD5231BRUZ100-RL7 operates in rheostat mode using either Terminal W–B or W–A, with guaranteed monotonicity and R-DNL/R-INL specifications provided for RWB configuration. In this mode, Terminal A or B is left unconnected (NC), and the wiper-to-terminal resistance varies linearly with code. Maximum continuous current is ±2 mA, and voltage compliance follows VSS ≤ VW ≤ VDD.
What is the purpose of the O1 and O2 pins on AD5231BRUZ100-RL7?
O1 and O2 are nonvolatile digital outputs on AD5231BRUZ100-RL7, each mapped to one bit (D0/D1) in Address 0x1 of the EEMEM. They retain their logic state across power cycles and can be programmed via SPI Instructions 2 or 4. These outputs provide two additional user-configurable control signals - e.g., enabling auxiliary circuitry or indicating calibration status - without requiring external latches or NVM.
AD5231BRUZ100-RL7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Taper:
- Linear
- Configuration:
- Potentiometer
- Number of Circuits:
- 1
- Number of Taps:
- 1024
- Resistance (Ohms):
- 100k
- Interface:
- SPI
- Memory Type:
- Non-Volatile
- Voltage - Supply:
- 2.7V ~ 5.5V, ±2.25V ~ 2.75V
- Features:
- Cascade Pin
- Tolerance:
- -40%, +20%
- Temperature Coefficient (Typ):
- 600ppm/°C
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 16-TSSOP
- Operating Temperature:
- -40°C ~ 85°C
- Resistance - Wiper (Ohms) (Typ):
- 50
AD5231BRUZ100-RL7 FAQ
1.How can I place an order for AD5231BRUZ100-RL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD5231BRUZ100-RL7 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 AD5231BRUZ100-RL7 reliable?
The price and inventory of AD5231BRUZ100-RL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD5231BRUZ100-RL7 is usually 5 days.
3.What payment methods are accepted for AD5231BRUZ100-RL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD5231BRUZ100-RL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD5231BRUZ100-RL7?
AD5231BRUZ100-RL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD5231BRUZ100-RL7 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 AD5231BRUZ100-RL7?
For technical support, including AD5231BRUZ100-RL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD5231BRUZ100-RL7 requirements.
6.How does Aetrix verify that AD5231BRUZ100-RL7 is sourced from the original manufacturer or authorized distributors?
All AD5231BRUZ100-RL7 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 AD5231BRUZ100-RL7 meets industry standards.
7.What is the process for return or replacement of AD5231BRUZ100-RL7?
All AD5231BRUZ100-RL7 units undergo pre-shipment inspection (PSI). If there is an issue with AD5231BRUZ100-RL7, 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 AD5231BRUZ100-RL7 part is unused and in its original packaging.
Return procedure for AD5231BRUZ100-RL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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