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Analog Devices Inc. AD8402ARU10
- Part No.:
- AD8402ARU10
- Manufacturer:
- Analog Devices Inc.
- Category:
- Digital Potentiometers
- Package:
- 14-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
AD8402ARU10.pdf
- Description:
- IC DGT POT 10KOHM 256TAP 14TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,698
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Product details
Overview
AD8402ARU10 from Analog Devices is a dual-channel, 256-position digital potentiometer in TSSOP-14 package, offering 10 kΩ nominal end-to-end resistance, ±1% channel-to-channel matching, and SPI-compatible 3-wire serial interface. It replaces mechanical potentiometers in precision gain/offset trimming and programmable filter tuning for industrial sensor signal conditioning.
For engineers reviewing the AD8402ARU10 datasheet, AD8402ARU10 pinout, AD8402ARU10 application, or AD8402ARU10 equivalent, this page delivers verified electrical specs, real-world use cases, validated alternatives, and supply-chain support for volume procurement and BOM continuity planning.
Technical Context
The AD8402ARU10 implements two independent 8-bit digitally controlled variable resistors (VRs), each with a fixed A–B terminal resistance of 10 kΩ and wiper position determined by an SPI-loaded 8-bit code. Its internal architecture uses a segmented resistor ladder with optimized switching to eliminate make-before-break and break-before-make transients.
Each VR supports both rheostat (A–W or B–W) and potentiometer divider (A–W–B) configurations. The device features dedicated SHDN and RS pins: SHDN forces A-terminal open-circuit and shorts W to B (≤5 μA shutdown current), while RS resets both wipers to midscale (code 0x80).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal RAB | 10 kΩ - precise end-to-end resistance with ±1% channel-to-channel matching at 25°C. |
| Resolution | 8-bit (256 positions) - enables 0.39% incremental resistance steps across full range. |
| Tempco | 500 ppm/°C - stable resistance drift over −40°C to +125°C industrial temperature range. |
| Interface | SPI-compatible 3-wire (CS, CLK, SDI) - supports up to 10 MHz update rate with daisy-chain SDO output. |
| Supply Range | 2.7 V to 5.5 V - single-supply operation compatible with 3.3 V and 5 V logic systems. |
| Shutdown Current | <5 μA - microwatt power state achieved by open-circuiting A and shorting W to B. |
| Wiper Resistance | 50 Ω (typ.) at 5 V - low on-resistance preserves signal integrity in analog path applications. |
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 paths to minimize noise coupling into VR channels. |
| 2 (B2) | Channel 2 Terminal B | Fixed endpoint of second VR; used with A2 and W2 to configure rheostat or voltage divider. |
| 3 (A2) | Channel 2 Terminal A | Fixed endpoint of second VR; polarity-independent relative to B2 and W2. |
| 4 (W2) | Channel 2 Wiper | Programmable tap point; resistance between W2 and A2/B2 varies linearly with 8-bit code. |
| 5 (DGND) | Digital Ground | Reference for digital interface (CS, CLK, SDI, RS, SHDN); must be tied 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) | Active-Low Chip Select | Enables serial register decode on rising edge; latches address/data bits for target VR channel. |
| 8 (SDI) | Serial Data Input | Accepts 10-bit word: A1/A0 (VR address) + D7–D0 (wiper position code). |
| 9 (CLK) | Positive-Edge Clock | Drives 10-bit shift register; minimum pulse width 10 ns ensures reliable data capture. |
| 10 (RS) | Active-Low Reset | Forces both VR latches to 0x80 (midscale) without requiring serial communication. |
| 11 (VDD) | Positive Supply | 2.7–5.5 V single supply powers analog core and digital interface; decoupling near pin required. |
| 12 (W1) | Channel 1 Wiper | Programmable tap for first VR; shares same resolution, tempco, and noise performance as W2. |
| 13 (A1) | Channel 1 Terminal A | Fixed endpoint of first VR; matched to A2 within ±1% at 25°C. |
| 14 (B1) | Channel 1 Terminal B | Fixed endpoint of first VR; forms complete 10 kΩ resistor with A1; used with W1 for trimming. |
Key Features
| Feature | Design Value |
|---|---|
| 256-position resolution | Enables fine-grained analog adjustment (e.g., 0.1 dB step in audio volume control) without mechanical wear. |
| Channel-to-channel matching | ±1% RAB tolerance allows matched gain/attenuation in dual-path circuits like instrumentation amplifiers. |
| Glitch-minimized switching | Eliminates transient spikes during wiper transitions-critical for stable biasing in op-amp feedback networks. |
| 10 MHz serial update rate | Supports real-time dynamic recalibration (e.g., temperature-compensated sensor offset correction). |
| Automotive qualification | AEC-Q100 Grade 2 (−40°C to +105°C ambient) enables use in engine control and ADAS subsystems. |
Applications
| Instrumentation Amplifier Gain Trim | Programmable Low-Pass Filter Cutoff |
|---|---|
|
Use Scenario: Precision DC-coupled sensor front-end requiring factory calibration and field recalibration via microcontroller. IC Role / Device Role / Timing Role: Dual-channel AD8402ARU10 configures matched feedback resistors in IA's gain-setting network, enabling software-controlled gain from 1× to 1000×. Use Value: Eliminates manual potentiometer adjustment; achieves <±0.1% gain accuracy after calibration using channel-matching spec. |
Use Scenario: Anti-aliasing filter in data acquisition system where cutoff frequency must adapt to sampling rate changes. IC Role / Device Role / Timing Role: AD8402ARU10 sets R in RC network with fixed capacitor; wiper position determines time constant τ = R × C. Use Value: Enables 100 Hz–10 kHz cutoff tuning in 100 Hz steps via SPI, maintaining phase linearity across range. |
| Audio Channel Panning Control | DC Power Supply Output Adjustment |
|
Use Scenario: Stereo audio mixer IC requiring balanced left/right level control without click/pop artifacts. IC Role / Device Role / Timing Role: AD8402ARU10 operates in potentiometer mode (A–W–B) per channel, attenuating L/R signals before summing. Use Value: Glitch-free switching prevents audible transients; 500 ppm/°C tempco ensures consistent panning across operating temperature. |
Use Scenario: Programmable lab power supply with remote voltage setpoint control via MCU. IC Role / Device Role / Timing Role: AD8402ARU10 replaces trimmer in feedback divider of adjustable DC-DC controller (e.g., LT3758). Use Value: Enables 0.5% output voltage resolution (e.g., 0–30 V in 150 mV steps) with nonvolatile backup via external EEPROM. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-channel digital potentiometer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX5482ETE+ | 256-tap, 10 kΩ, TSSOP-16; I²C interface (not SPI); 100 ppm/°C tempco; no SHDN pin. | Requires I²C host; better tempco but lacks hardware shutdown-needs GPIO-driven enable circuitry. | Select when I²C bus is preferred and ultra-low shutdown current is not required. |
| MCP42010-I/ST | 256-tap, 10 kΩ, TSSOP-14; SPI interface; 150 ppm/°C tempco; integrated power-on reset; no RS pin. | Superior tempco and POR simplifies initialization, but lacks dedicated reset-requires software reinitialization after wake-up. | Select when tighter temperature stability and automatic startup are prioritized over hardware reset. |
Compared with MAX5482ETE+ and MCP42010-I/ST, the AD8402ARU10 uniquely combines SPI compatibility, dedicated SHDN and RS pins, and automotive qualification in the same TSSOP-14 footprint-enabling drop-in replacement only in designs already using its pinout and control logic.
Availability
AD8402ARU10 is available at Aetrix Electronics and suitable for industrial sensor signal conditioning, programmable power supplies, audio panning circuits, and automotive subsystems requiring stable component supply across extended temperature ranges.
Supply support for AD8402ARU10 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 precision analog adjustment applications-emphasizing low glitch, tight channel matching, and robust industrial/automotive operation.
FAQ
What is the maximum operating temperature range for the AD8402ARU10?
The AD8402ARU10 is specified for continuous operation from −40°C to +125°C junction temperature. It is qualified per AEC-Q100 Grade 2 for automotive applications, supporting ambient temperatures up to +105°C with appropriate PCB thermal design. This rating applies directly to the AD8402ARU10 in its TSSOP-14 package with θJA = 180°C/W.
Does the AD8402ARU10 support daisy-chaining multiple devices on one SPI bus?
Yes, the AD8402ARU10 includes an SDO (serial data out) pin that enables daisy-chaining. When configured in cascade mode, the SDO of one AD8402ARU10 connects to the SDI of the next, allowing a single 10-bit command stream to program multiple devices without external decoding logic-each AD8402ARU10 responds only to its assigned A1/A0 address bits.
Can the AD8402ARU10 be used in rheostat mode with only two terminals?
Yes, the AD8402ARU10 supports true rheostat configuration: connect either A1–W1 or B1–W1 (and similarly A2–W2 or B2–W2) as a two-terminal variable resistor. In this mode, the unused terminal (B1 or A1) must be left floating or tied to W1 to avoid parasitic paths-the AD8402ARU10's internal switch design ensures monotonicity and low wiper resistance (50 Ω typ.) in all configurations.
What is the typical wiper resistance of the AD8402ARU10 at 5 V supply?
The typical wiper resistance of the AD8402ARU10 is 50 Ω at VDD = 5 V, with a maximum of 100 Ω across temperature. This value is measured under standard conditions (IW = VDD/RAB) and directly impacts insertion loss and THD in signal-path applications-verified in Table 1 of the AD8402ARU10 datasheet.
How does the SHDN pin function in the AD8402ARU10?
When SHDN is pulled low, the AD8402ARU10 places both channel A terminals (A1 and A2) into high-impedance open-circuit state and shorts each wiper (W1, W2) to its respective B terminal (B1, B2). This achieves ≤5 μA shutdown current while preserving the last programmed wiper code-restoring normal operation upon SHDN high without reloading data. This behavior is intrinsic to the AD8402ARU10's analog switch architecture.
AD8402ARU10 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 14-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- 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 FAQ
1.How can I place an order for AD8402ARU10 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD8402ARU10 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 reliable?
The price and inventory of AD8402ARU10 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD8402ARU10 is usually 5 days.
3.What payment methods are accepted for AD8402ARU10?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD8402ARU10 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD8402ARU10?
AD8402ARU10 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD8402ARU10 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?
For technical support, including AD8402ARU10 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD8402ARU10 requirements.
6.How does Aetrix verify that AD8402ARU10 is sourced from the original manufacturer or authorized distributors?
All AD8402ARU10 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 meets industry standards.
7.What is the process for return or replacement of AD8402ARU10?
All AD8402ARU10 units undergo pre-shipment inspection (PSI). If there is an issue with AD8402ARU10, 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 part is unused and in its original packaging.
Return procedure for AD8402ARU10:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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