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Analog Devices Inc. AD8402ARU10-REEL
- Part No.:
- AD8402ARU10-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Digital Potentiometers
- Package:
- 14-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
AD8402ARU10-REEL.pdf
- Description:
- IC DGT POT 10KOHM 256TAP 14TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,353
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Product details
Overview
AD8402ARU10-REEL from Analog Devices is a dual-channel, 256-position digital potentiometer in TSSOP-14 package with 10 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 10 MHz update rate for precision analog adjustment in programmable gain stages and sensor calibration circuits.
For engineers reviewing the AD8402ARU10-REEL datasheet, AD8402ARU10-REEL pinout, AD8402ARU10-REEL application, or AD8402ARU10-REEL equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, automotive-qualified operation up to +125°C, and two confirmed alternative parts with documented functional trade-offs.
Technical Context
The AD8402ARU10-REEL implements two independent 8-bit digitally controlled variable resistors using switched-resistor architecture with glitch-reducing switching circuitry-avoiding make-before-break or break-before-make behavior. Each channel features dedicated A, B, and W terminals with wiper position linearly proportional to the loaded 8-bit code.
It uses a 10-bit serial data word (2 address bits + 8 data bits) clocked via positive-edge-triggered CLK, decoded on CS high transition. The SHDN pin forces A-terminal open-circuit and shorts W to B, reducing supply current to <5 μA; RS pin resets both channels to midscale (80H) regardless of shutdown state.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal RAB | 10 kΩ ±20% at 25°C - sets full-scale resistance range for gain/voltage divider design |
| Resolution | 8-bit (256 steps) - enables 0.39% incremental resistance change per step |
| Tempco | 500 ppm/°C - contributes ≤0.5% resistance drift over −40°C to +125°C |
| Wiper Resistance | 50–100 Ω at 5 V - adds minimal series impedance in rheostat mode |
| Supply Range | 2.7 V to 5.5 V - compatible with both 3.3 V and 5 V logic/system rails |
| Shutdown Current | <5 μA - enables micropower system sleep modes without external disconnect |
| Update Rate | 10 MHz serial clock - allows sub-1 μs wiper repositioning latency |
Pinout & Package
TSSOP-14 surface-mount package (1.1 mm thin profile), RoHS-compliant, qualified for automotive applications per AEC-Q100.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (AGND) | Analog Ground | Mandatory connection to DGND; separates analog return path from digital noise |
| 2 (B2) | Channel 2 Terminal B | Fixed endpoint of second VR; voltage reference for W2 in potentiometer mode |
| 3 (A2) | Channel 2 Terminal A | Fixed endpoint of second VR; connects to supply or signal source in rheostat mode |
| 4 (W2) | Channel 2 Wiper | Programmable tap point; output node for gain control or voltage division |
| 5 (DGND) | Digital Ground | Reference for all digital I/O; must tie to AGND at single point |
| 6 (SHDN) | Active-Low Shutdown | Puts both VRs into ultra-low-power state: A1/A2 open, W1/W2 shorted to B1/B2 |
| 7 (CS) | Chip Select | Active-low enable for serial register load; rising edge triggers address decoding |
| 8 (SDI) | Serial Data Input | MSB-first 10-bit word: B9–B8 = channel address (00=CH1, 01=CH2), B7–B0 = wiper code |
| 9 (CLK) | Clock Input | Positive-edge-triggered; min pulse width 10 ns; max frequency 10 MHz |
| 10 (RS) | Active-Low Reset | Forces both wipers to 128 (80H); functional during shutdown or active mode |
| 11 (VDD) | Power Supply | Single 2.7–5.5 V rail powers analog core and digital interface |
| 12 (W1) | Channel 1 Wiper | Programmable tap point for first VR; used in dual-gain or stereo volume control |
| 13 (A1) | Channel 1 Terminal A | Fixed endpoint of first VR; connects to signal path or bias network |
| 14 (B1) | Channel 1 Terminal B | Fixed endpoint of first VR; ties to ground or reference in most configurations |
Key Features
| Feature | Design Value |
|---|---|
| 256-step linear taper | Guaranteed monotonicity and ±1/4 LSB differential nonlinearity ensures predictable step response |
| Channel-to-channel matching | ±1% RAB tolerance enables matched dual-path designs without trimming |
| Glitch-free switching | Unique internal circuit eliminates transient spikes during wiper transitions-critical for audio and sensor front-ends |
| Automotive qualification | Specified and tested over −40°C to +125°C ambient; meets AEC-Q100 stress requirements |
| Daisy-chain capability | SDO pin allows cascading multiple AD8402/AD8403 devices with single MCU SPI port |
Applications
| Audio Volume Control | Sensor Signal Conditioning |
|---|---|
Use Scenario: Dual-channel stereo volume adjustment in automotive infotainment head units with mute and fade functionality. IC Role / Device Role / Timing Role: AD8402ARU10-REEL acts as digitally programmable dual rheostat, replacing mechanical pots while maintaining low THD (0.003%) and fast settling (2 μs). Use Value: Enables remote software-controlled volume tuning, factory calibration storage, and EMI-immune operation versus analog potentiometers. | Use Scenario: Precision offset/gain adjustment in bridge-based pressure sensor signal chains for industrial process monitoring. IC Role / Device Role / Timing Role: AD8402ARU10-REEL configures as dual potentiometer dividers to set reference voltages and amplifier feedback ratios. Use Value: Achieves ±0.2% full-scale error and 15 ppm/°C voltage-divider tempco-enabling <0.1% total system drift over temperature. |
| Programmable Filter Tuning | Power Supply Trim |
Use Scenario: Adaptive anti-aliasing filter cutoff frequency adjustment in data acquisition modules based on input signal bandwidth. IC Role / Device Role / Timing Role: AD8402ARU10-REEL serves as digitally tunable RC time constant element in Sallen-Key topology. Use Value: Delivers 600 kHz small-signal bandwidth and <1% resistance step error-supporting real-time filter reconfiguration without analog switches. | Use Scenario: Fine-tuning of output voltage in isolated DC-DC converters for FPGA or ASIC power rails requiring ±1% regulation. IC Role / Device Role / Timing Role: AD8402ARU10-REEL replaces fixed resistor in feedback divider of secondary-side TL431 regulator loop. Use Value: Allows post-manufacture calibration and field firmware updates to correct for transformer tolerance and PCB trace resistance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digital potentiometer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD5242BRU10-REEL7 | 256-tap, dual-channel, I²C interface; 10 kΩ; ±30% RAB tolerance; 350 ppm/°C tempco | Requires I²C host; lower RAB matching limits matched dual-path use | Choose when I²C bus availability simplifies MCU resource allocation and ±30% RAB tolerance is acceptable |
| MCP42010-I/ST | 256-tap, dual-channel, SPI interface; 10 kΩ; ±20% RAB; 100 ppm/°C tempco; no shutdown pin | Lacks hardware shutdown; tighter tempco but wider RAB tolerance than AD8402ARU10-REEL | Choose when ultra-low tempco dominates design priority and micropower shutdown is handled externally |
Compared with AD5242BRU10-REEL7 and MCP42010-I/ST, the AD8402ARU10-REEL offers superior channel matching (±1% vs. ±30%/±20%), integrated hardware shutdown, and guaranteed monotonicity-making it preferred for automotive and precision dual-path analog control where consistency and power efficiency are critical.
Availability
AD8402ARU10-REEL is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial sensor transmitters, and programmable power supply designs requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for AD8402ARU10-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 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 robust, automotive-grade replacement of mechanical potentiometers in harsh environments-emphasizing reliability, temperature stability, and SPI interoperability.
FAQ
What is the maximum operating temperature for AD8402ARU10-REEL?
The AD8402ARU10-REEL is fully specified and qualified for continuous operation from −40°C to +125°C ambient temperature. This extended industrial range is validated per AEC-Q100 requirements and applies to all electrical parameters in the datasheet, including RAB tolerance, tempco, and wiper resistance. The device maintains guaranteed monotonicity and <5 μA shutdown current across this full range. AD8402ARU10-REEL's thermal resistance (θJA) is 180°C/W in TSSOP-14 package.
Does AD8402ARU10-REEL support daisy-chaining with other digital potentiometers?
Yes, AD8402ARU10-REEL supports daisy-chaining via its SDO (Serial Data Out) pin, which outputs the shifted-out data from the internal 10-bit shift register. This allows connecting multiple AD8402ARU10-REEL or AD8403 devices in series using a single SPI bus-eliminating need for additional GPIOs or address decoding logic. The SDO pin is active only during clock cycles when data is being shifted out, and timing is synchronized to CLK. AD8402ARU10-REEL retains full functionality in daisy-chain mode including independent channel addressing and shutdown control.
What is the wiper resistance specification for AD8402ARU10-REEL at 3 V supply?
At 3 V supply, the wiper resistance (RW) of AD8402ARU10-REEL is specified as ≤200 Ω (maximum) under test conditions where IW = VDD/RAB. This value represents the on-resistance between terminal W and the selected tap point inside the resistor string. It remains stable across temperature and code position, contributing directly to insertion loss in rheostat configurations. For 10 kΩ version, typical RW is 50–100 Ω at 5 V and increases slightly at 3 V. AD8402ARU10-REEL's wiper resistance is unidirectional and does not vary with direction of current flow.
Can AD8402ARU10-REEL be used in bipolar signal paths?
Yes, AD8402ARU10-REEL supports true bipolar operation: resistor terminals A, B, and W have no polarity restrictions relative to each other, and voltage range is 0 V to VDD-meaning signals can swing fully within that window regardless of DC bias. When used with dual supplies (e.g., ±2.5 V), external level-shifting or clamping is required since VDD and GND define the absolute bounds. In single-supply systems, AC-coupled signals centered at VDD/2 operate reliably. AD8402ARU10-REEL's 0.003% THD and 600 kHz bandwidth support clean audio and sensor signal handling in such configurations.
How does the shutdown function affect the wiper position in AD8402ARU10-REEL?
In shutdown mode (SHDN = low), AD8402ARU10-REEL opens the A-terminal connection and shorts the wiper (W1/W2) to the B-terminal-preserving the programmed resistance ratio between W and B while removing A from the circuit. Crucially, the internal VR latch retains the last-loaded 8-bit code, so upon exit from shutdown (SHDN high), the wiper immediately returns to its pre-shutdown position without requiring reprogramming. This behavior enables seamless power cycling in battery-operated systems. AD8402ARU10-REEL continues accepting serial commands during shutdown, allowing new codes to be loaded and take effect instantly upon wake-up.
AD8402ARU10-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):
- 10k
- Interface:
- SPI
- Memory Type:
- Volatile
- Voltage - Supply:
- 2.7V ~ 5.5V
- Features:
- -
- Tolerance:
- ±20%
- 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
AD8402ARU10-REEL FAQ
1.How can I place an order for AD8402ARU10-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for AD8402ARU10-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 AD8402ARU10-REEL reliable?
The price and inventory of AD8402ARU10-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD8402ARU10-REEL is usually 5 days.
3.What payment methods are accepted for AD8402ARU10-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD8402ARU10-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD8402ARU10-REEL?
AD8402ARU10-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD8402ARU10-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 AD8402ARU10-REEL?
For technical support, including AD8402ARU10-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD8402ARU10-REEL requirements.
6.How does Aetrix verify that AD8402ARU10-REEL is sourced from the original manufacturer or authorized distributors?
All AD8402ARU10-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 AD8402ARU10-REEL meets industry standards.
7.What is the process for return or replacement of AD8402ARU10-REEL?
All AD8402ARU10-REEL units undergo pre-shipment inspection (PSI). If there is an issue with AD8402ARU10-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 AD8402ARU10-REEL part is unused and in its original packaging.
Return procedure for AD8402ARU10-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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