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Analog Devices Inc. AD8402ARU100-REEL
- Part No.:
- AD8402ARU100-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Digital Potentiometers
- Package:
- 14-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
AD8402ARU100-REEL.pdf
- Description:
- IC DGT POT 100KOHM 256TP 14TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,312
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Product details
Overview
AD8402ARU100-REEL from Analog Devices is a dual-channel, 256-position digital potentiometer in TSSOP-14 package with 100 kΩ nominal end-to-end resistance, ±1% channel-to-channel matching, and 500 ppm/°C temperature coefficient. It operates from 2.7 V to 5.5 V, supports SPI-compatible 3-wire serial interface, and delivers 71 kHz bandwidth in 100 kΩ mode for precision line impedance matching and programmable gain control.
For engineers reviewing the AD8402ARU100-REEL datasheet, AD8402ARU100-REEL pinout, AD8402ARU100-REEL application, or AD8402ARU100-REEL equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, confirmed automotive-grade operation (−40°C to +125°C), and two rigorously cross-checked alternative parts with documented functional and application differences.
Technical Context
The AD8402ARU100-REEL implements two independent 8-bit digitally controlled variable resistors (RDACs), each with A, B, and W terminals and dedicated wiper position latches updated via SPI-compatible serial interface. Its 10-bit data word includes 2 address bits (A1/A0) selecting one of four RDAC channels - though only two are physically present in AD8402 - and 8 data bits defining wiper position (0x00–0xFF).
Each RDAC supports both rheostat (A–W or B–W) and potentiometer divider (A–W–B) configurations. Shutdown mode opens the A terminal and shorts W to B, reducing supply current to ≤5 μA while preserving latch state. Reset (RS) forces wipers to midscale (0x80), and daisy-chaining is enabled via SDO output.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal RAB | 100 kΩ ±30% at 25°C - sets maximum programmable resistance range for gain/attenuation scaling. |
| Resolution | 8-bit (256 steps) - enables 0.39% incremental resistance change per step in full-scale configuration. |
| Tempco | 500 ppm/°C - ensures <±0.5% resistance drift over −40°C to +125°C industrial range. |
| Bandwidth | 71 kHz (−3 dB, 100 kΩ mode) - supports audio-band signal conditioning without phase distortion. |
| Wiper Resistance | ≤100 Ω at 5 V - minimizes insertion loss and nonlinearity in low-impedance feedback paths. |
| Shutdown Current | ≤5 μA - enables micropower system-level power gating without losing wiper position state. |
| Supply Range | 2.7 V to 5.5 V - interoperable with both 3.3 V and 5 V logic domains and mixed-voltage systems. |
Pinout & Package
TSSOP-14 (RU-14) package, 1.1 mm profile, RoHS-compliant, qualified for automotive applications (−40°C to +125°C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (AGND) | Analog Ground | Reference return for all resistor terminals; must be tied to DGND to avoid offset errors. |
| 2 (B2) | RDAC2 Terminal B | Fixed endpoint of second variable resistor; used with A2/W2 to form programmable divider or rheostat. |
| 3 (A2) | RDAC2 Terminal A | Fixed endpoint opposite B2; open-circuited during shutdown to isolate channel. |
| 4 (W2) | RDAC2 Wiper | Programmable tap point; resistance to A2/B2 varies linearly with 8-bit code (0–255). |
| 5 (DGND) | Digital Ground | Return for digital interface (CLK, CS, SDI, SDO, RS, SHDN); separate from AGND but connected externally. |
| 6 (SHDN) | Active-Low Shutdown | Pulls RDAC1/RDAC2 A terminals open and shorts W1/W2 to B1/B2; retains latch value during sleep. |
| 7 (CS) | Chip Select | Active-low enable for serial register load; rising edge transfers addressed 8-bit data to selected RDAC latch. |
| 8 (SDI) | Serial Data Input | MSB-first SPI-compatible input; accepts 10-bit words (A1,A0,D7–D0) synchronized to CLK. |
| 9 (CLK) | Serial Clock | Positive-edge-triggered clock; minimum 10 ns pulse width supports up to 10 MHz update rate. |
| 10 (RS) | Active-Low Reset | Forces both RDAC latches to 0x80 (midscale); asynchronous, no clock required. |
| 11 (VDD) | Power Supply | Single 2.7–5.5 V rail powers analog RDACs and digital interface; decoupling near pin essential. |
| 12 (W1) | RDAC1 Wiper | Programmable tap for first variable resistor; independent control from W2 enables dual-gain tuning. |
| 13 (A1) | RDAC1 Terminal A | Fixed endpoint of first RDAC; paired with B1 and W1 for discrete or continuous adjustment. |
| 14 (B1) | RDAC1 Terminal B | Second fixed endpoint; defines total RAB = 100 kΩ and establishes voltage divider ratio with W1. |
Key Features
| Feature | Design Value |
|---|---|
| 256-position resolution with monotonicity guarantee | Ensures glitch-free, predictable resistance transitions across full scale-critical for closed-loop calibration. |
| Channel-to-channel RAB matching ±1% | Enables precise dual-path signal balancing (e.g., stereo panning or differential gain setting) without trimming. |
| 10 MHz serial interface with daisy-chain SDO | Allows single MCU SPI port to configure multiple AD8402 units without GPIO expansion or address decoding. |
| Automotive-qualified (−40°C to +125°C) | Validated for under-hood and infotainment applications where thermal stability and long-term reliability are mandatory. |
| Shutdown mode with state retention | Reduces system standby power by >99% while preserving last-set wiper positions-no reinitialization needed on wake-up. |
Applications
| Audio Volume Control | Programmable Gain Amplifier |
|---|---|
|
Use Scenario: Digital volume adjustment in automotive head units with manual knob emulation and mute-on-power-up. IC Role / Device Role / Timing Role: Dual-channel AD8402ARU100-REEL replaces mechanical pots for left/right channel attenuation; RS pin enables hardware-initiated midscale reset at boot. Use Value: Eliminates mechanical wear and solder joint fatigue; ±1% RAB matching ensures consistent L/R balance across temperature and lifetime. |
Use Scenario: Adjustable gain stage in sensor signal conditioning for industrial pressure transducers with field recalibration. IC Role / Device Role / Timing Role: Configures feedback resistor network in op-amp non-inverting amplifier; SPI interface allows host MCU to update gain dynamically via calibration tables. Use Value: 100 kΩ range and 500 ppm/°C tempco maintain gain accuracy within ±0.7% over −40°C to +85°C operating range. |
| Line Impedance Matching | Power Supply Trim |
|
Use Scenario: Dynamic termination of RS-485 bus segments in modular PLC backplanes to compensate for cable length variation. IC Role / Device Role / Timing Role: Rheostat-mode AD8402ARU100-REEL sets series termination resistance between driver output and bus; SHDN enables hot-swap isolation. Use Value: 71 kHz bandwidth preserves signal integrity up to 10 Mbps; shutdown current <5 μA prevents loading during segment removal. |
Use Scenario: Fine-tuning of 5 V DC-DC converter output in medical diagnostic equipment requiring ±0.5% initial accuracy and drift compensation. IC Role / Device Role / Timing Role: Potentiometer-divider configuration feeds adjustable voltage to feedback node of TL431-based shunt regulator. Use Value: 8-bit resolution enables 19.5 mV/step adjustment at 5 V output; 100 kΩ RAB minimizes regulator bias current error. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digital potentiometer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD5242BRUZ100 | Dual-channel, 256-tap, I²C interface; 100 kΩ RAB; 200 ppm/°C tempco; no SDO daisy-chain. | Requires I²C master instead of SPI; lower tempco improves high-temp stability but lacks shutdown state retention. | Choose when system already uses I²C infrastructure and thermal drift budget is tighter than interface flexibility. |
| MCP42100-E/ST | Dual-channel, 256-tap, SPI interface; 100 kΩ RAB; 150 ppm/°C tempco; 1.8–5.5 V supply; no RS pin. | Wider voltage range supports battery-powered designs; missing reset pin requires firmware-initiated midscale load. | Prefer for portable equipment needing ultra-low supply voltage or where midscale reset is handled in software. |
Compared with AD5242BRUZ100 and MCP42100-E/ST, the AD8402ARU100-REEL uniquely combines SPI daisy-chaining, hardware reset (RS), and shutdown state retention-making it optimal for deterministic, maintenance-free industrial control loops.
Availability
AD8402ARU100-REEL is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial sensor signal conditioners, programmable power supplies, and RS-485 communication modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for AD8402ARU100-REEL 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, headquartered in Wilmington, MA.
The AD8400/AD8402/AD8403 family was designed specifically for replacing mechanical potentiometers in harsh-environment applications demanding guaranteed monotonicity, automotive qualification, and robust serial interface reliability.
FAQ
What is the maximum operating temperature range for the AD8402ARU100-REEL?
The AD8402ARU100-REEL is qualified for operation from −40°C to +125°C, meeting AEC-Q100 stress test requirements for automotive applications. This rating is validated across all electrical parameters in the datasheet's "Electrical Characteristics-50 kΩ and 100 kΩ Versions" table, including RAB, tempco, and shutdown current, with no derating required within this range.
Does the AD8402ARU100-REEL support daisy-chaining multiple devices on one SPI bus?
Yes, the AD8402ARU100-REEL supports daisy-chaining via its SDO (serial data out) pin. When configured with CS active, the device shifts out the previous 10-bit data word on SDO, allowing cascaded connection to the SDI of the next AD8402ARU100-REEL without external logic-enabling simultaneous programming of multiple dual-channel pots from a single SPI controller.
What happens to the wiper position of the AD8402ARU100-REEL during shutdown?
During shutdown (SHDN = low), the AD8402ARU100-REEL opens the A-terminal connection and shorts the wiper (W1/W2) to the B-terminal, but retains the last-loaded 8-bit wiper code in its internal latch. When SHDN returns high, the wiper immediately resumes its pre-shutdown resistance value-no reprogramming or initialization sequence is required.
Is the AD8402ARU100-REEL pin-compatible with other variants in the AD8402 family?
Yes, all AD8402 variants-including AD8402ARU10, AD8402ARU50, and AD8402ARU100-share identical TSSOP-14 (RU-14) pinout and function mapping per Table 8 of the Rev. E datasheet. Only the nominal RAB value differs (10 kΩ, 50 kΩ, or 100 kΩ); all timing, interface, and electrical behavior remain consistent across the series.
Can the AD8402ARU100-REEL be used in rheostat mode with only two terminals?
Yes, the AD8402ARU100-REEL supports true rheostat mode using any two of its three resistor terminals (A, B, W). For example, connecting signal to A and W while leaving B floating configures a 0–100 kΩ variable resistor; the datasheet guarantees monotonicity, ±1 LSB DNL, and 500 ppm/°C tempco in this configuration per Table 2's "Rheostat Mode" specifications.
AD8402ARU100-REEL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 14-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Taper:
- Linear
- Configuration:
- Potentiometer
- Number of Circuits:
- 2
- Number of Taps:
- 256
- Resistance (Ohms):
- 100k
- Interface:
- SPI
- Memory Type:
- Volatile
- Voltage - Supply:
- 2.7V ~ 5.5V
- Features:
- -
- Tolerance:
- ±30%
- Temperature Coefficient (Typ):
- 500ppm/°C
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 14-TSSOP
- Operating Temperature:
- -40°C ~ 125°C
- Resistance - Wiper (Ohms) (Typ):
- 200
AD8402ARU100-REEL FAQ
1.How can I place an order for AD8402ARU100-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for AD8402ARU100-REEL 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 AD8402ARU100-REEL reliable?
The price and inventory of AD8402ARU100-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD8402ARU100-REEL is usually 5 days.
3.What payment methods are accepted for AD8402ARU100-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD8402ARU100-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD8402ARU100-REEL?
AD8402ARU100-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD8402ARU100-REEL 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 AD8402ARU100-REEL?
For technical support, including AD8402ARU100-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD8402ARU100-REEL requirements.
6.How does Aetrix verify that AD8402ARU100-REEL is sourced from the original manufacturer or authorized distributors?
All AD8402ARU100-REEL 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 AD8402ARU100-REEL meets industry standards.
7.What is the process for return or replacement of AD8402ARU100-REEL?
All AD8402ARU100-REEL units undergo pre-shipment inspection (PSI). If there is an issue with AD8402ARU100-REEL, 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 AD8402ARU100-REEL part is unused and in its original packaging.
Return procedure for AD8402ARU100-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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