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Analog Devices Inc. AD8402AR10-REEL
- Part No.:
- AD8402AR10-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Digital Potentiometers
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AD8402AR10-REEL.pdf
- Description:
- IC DGTL POT 10KOHM 256TAP 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,287
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Product details
Overview
AD8402AR10-REEL from Analog Devices is a dual-channel, 256-position digital potentiometer in SOIC-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 2 μs wiper settling time - used for precision programmable gain control in industrial sensor signal conditioning.
For engineers reviewing the AD8402AR10-REEL datasheet, AD8402AR10-REEL pinout, AD8402AR10-REEL application, or AD8402AR10-REEL equivalent, key selection considerations include its dual-rheostat/potentiometer configuration, shutdown current <5 μA, 10 MHz update rate, and guaranteed operation from −40°C to +125°C for automotive and harsh-environment designs.
Technical Context
The AD8402AR10-REEL implements two independent 8-bit digitally controlled variable resistors using a segmented resistor ladder with proprietary switching circuitry that eliminates make-before-break and break-before-make glitches. Each channel features dedicated A, B, and W terminals with wiper position determined by an 8-bit latch loaded via SPI-compatible serial interface using 10-bit data words (2-bit address + 8-bit code).
It supports both rheostat (A–W or B–W) and potentiometer (A–W–B) configurations, with voltage range of 0 V to VDD across all terminals, and includes active-low SHDN and RS pins for microwatt shutdown and midscale reset - enabling deterministic state recovery after power cycling without external memory.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal RAB | 10 kΩ ±20% at 25°C - defines full-scale resistance range for gain/attenuation scaling |
| Resolution | 8-bit (256 steps) - enables 0.39% incremental adjustment resolution per step |
| Tempco | 500 ppm/°C - ensures stable resistance over industrial temperature range (−40°C to +125°C) |
| VDD Range | 2.7 V to 5.5 V - compatible with both 3.3 V and 5 V logic/system rails |
| Settling Time | 2 μs (±1% error band) - supports real-time analog tuning in closed-loop systems |
| Shutdown Current | <5 μA - enables ultra-low-power standby in battery-operated instrumentation |
| Interface | 3-wire SPI-compatible (CS, CLK, SDI), 10 MHz max clock - no external level-shifting needed for MCU interfacing |
Pinout & Package
AD8402AR10-REEL is housed in a 14-lead SOIC surface-mount package (body width 3.9 mm, JEDEC MS-012). Pinout supports dual independent digital potentiometers with shared digital control lines and separate analog grounds.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (AGND) | Analog Ground | Reference return for both RDAC channels; must be connected to DGND |
| 2 (B2) | Channel 2 Terminal B | Fixed endpoint of second variable resistor; used in rheostat or divider mode |
| 3 (A2) | Channel 2 Terminal A | Fixed endpoint of second variable resistor; defines RA2B2 = 10 kΩ |
| 4 (W2) | Channel 2 Wiper | Adjustable tap point; resistance to A2/B2 varies linearly with 8-bit code |
| 5 (DGND) | Digital Ground | Return for digital interface; tied to AGND externally |
| 6 (SHDN) | Active-Low Shutdown | Puts both RDACs into open-circuit A-terminal + shorted W-to-B state (<5 μA IDD) |
| 7 (CS) | Chip Select | Active-low enable for serial data loading; rising edge latches address/data |
| 8 (SDI) | Serial Data Input | MSB-first 10-bit word: bits B9–B8 = channel address (00/01), B7–B0 = wiper code |
| 9 (CLK) | Serial Clock | Positive-edge-triggered; max 10 MHz - determines update speed and noise immunity |
| 10 (RS) | Active-Low Reset | Forces both wipers to midscale (code 0x80); retains latch state during shutdown |
| 11 (VDD) | Power Supply | Single 2.7–5.5 V rail powers analog and digital sections; no separate AVDD/DVDD |
| 12 (W1) | Channel 1 Wiper | Adjustable tap for first 10 kΩ RDAC; independent of W2 position |
| 13 (A1) | Channel 1 Terminal A | Fixed endpoint of first variable resistor; RA1B1 = 10 kΩ ±20% |
| 14 (B1) | Channel 1 Terminal B | Fixed endpoint of first variable resistor; completes dual-rheostat topology |
Key Features
| Feature | Design Value |
|---|---|
| No-glitch switching | Proprietary switch architecture prevents transient shorts/opens during wiper transitions - critical for biasing stability in amplifiers |
| Dual independent RDACs | Two 10 kΩ variable resistors share only digital control lines - enables matched gain/offset tuning in differential circuits |
| Automotive-qualified | Qualified per AEC-Q100 Grade 1 (−40°C to +125°C) - suitable for engine control, ADAS sensor interfaces |
| Zero-power shutdown | SHDN asserts open-circuit A terminal and shorts W-to-B, drawing <5 μA - preserves system-level power budget |
| Robust ESD protection | 4 kV HBM rating - withstands handling and board assembly without special precautions beyond standard ESD protocols |
Applications
| Instrumentation Gain Calibration | Audio Channel Panning |
|---|---|
Use Scenario: Programmable gain stage in a 24-bit precision ADC front-end for pressure transducers, where offset and gain drift must be corrected in-system. IC Role / Device Role / Timing Role: Dual-channel AD8402AR10-REEL configures as two independent rheostats - one adjusts op-amp feedback gain, the other trims input bias. Use Value: Enables factory and field calibration without mechanical potentiometers; 0.39% step resolution supports ≤0.1% total system gain accuracy. | Use Scenario: Stereo audio mixer IC requiring independent left/right channel volume and balance (pan) control in professional audio equipment. IC Role / Device Role / Timing Role: AD8402AR10-REEL operates in potentiometer mode (A–W–B) per channel to form voltage dividers driving audio DAC reference inputs. Use Value: 256-step linearity (±1/2 LSB INL) ensures smooth, click-free panning; 2 μs settling avoids audible artifacts during real-time adjustments. |
| Programmable Line Impedance Matching | DC Power Supply Trim |
Use Scenario: High-speed communication module (e.g., RS-485, CAN FD) requiring dynamic termination impedance adaptation to cable length and topology changes. IC Role / Device Role / Timing Role: AD8402AR10-REEL configured as rheostat between differential pair and ground to adjust termination resistance from 100 Ω to 120 Ω. Use Value: 10 kΩ RAB with 256-step resolution allows precise 47–120 Ω effective range via parallel/series combinations - meets TIA/EIA-485-A impedance tolerance. | Use Scenario: Programmable DC-DC converter output voltage adjustment in telecom power shelf, where remote firmware updates modify supply setpoints. IC Role / Device Role / Timing Role: AD8402AR10-REEL replaces mechanical trimmer in feedback divider network of isolated flyback controller. Use Value: SPI interface allows in-system reprogramming without hardware change; shutdown mode isolates feedback path during fault conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digital potentiometer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD5242BR100 | 256-step, dual 100 kΩ; I²C interface; 100 ppm/°C tempco; no SHDN pin | Lacks shutdown function; higher RAB limits current-handling in low-impedance feedback paths | Choose when I²C bus availability simplifies MCU integration and 100 kΩ range suits high-impedance bias networks |
| MCP42010-I/P | 256-step, dual 10 kΩ; SPI interface; 150 ppm/°C tempco; 2.7–5.5 V; no RS pin | Better tempco but lacks reset pin - requires software initialization to known state after power-up | Prefer for temperature-critical sensor bridges where long-term drift dominates over startup determinism |
Compared with AD5242BR100 and MCP42010-I/P, AD8402AR10-REEL uniquely combines automotive qualification, integrated shutdown, and midscale reset - making it optimal for safety-aware industrial and automotive systems requiring guaranteed post-power-up behavior and low-quiescent operation.
Availability
AD8402AR10-REEL is available at Aetrix Electronics and suitable for industrial sensor signal conditioning, automotive body electronics, and programmable power supply trimming requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for AD8402AR10-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 precision analog control loops - emphasizing low glitch, wide temperature operation, and robust serial interface for embedded calibration and tuning.
FAQ
What is the maximum operating temperature range for AD8402AR10-REEL?
AD8402AR10-REEL is specified for continuous operation from −40°C to +125°C and qualified to AEC-Q100 Grade 1 standards. This extended industrial temperature range ensures reliable performance in under-hood automotive applications, industrial PLC modules, and outdoor sensor enclosures where ambient temperatures exceed standard commercial limits. The 500 ppm/°C resistance tempco remains valid across this full range.
Does AD8402AR10-REEL support true 3-wire SPI communication without a dedicated SDO pin?
Yes, AD8402AR10-REEL uses a 3-wire SPI-compatible interface (CS, CLK, SDI) with no SDO pin - unlike the quad-channel AD8403. Data is unidirectional into the device; daisy-chaining is not supported. The 10-bit serial word (2-bit address + 8-bit code) is clocked on CLK rising edges, and CS high-to-low transition initiates loading. This simplifies PCB layout and MCU GPIO usage compared to full 4-wire SPI.
How does the SHDN pin function in AD8402AR10-REEL, and what happens to wiper position during shutdown?
When SHDN is pulled low, AD8402AR10-REEL opens the A-terminal connection and shorts the wiper (W) to the B-terminal for both channels, achieving <5 μA supply current. Critically, the internal 8-bit latch retains its last programmed code. Upon returning SHDN high, the wiper immediately resumes the exact prior resistance setting - no reinitialization or communication required. This enables zero-power sleep modes while preserving calibrated states.
Can AD8402AR10-REEL be used in rheostat mode with only two terminals per channel?
Yes, AD8402AR10-REEL supports true 2-terminal rheostat operation: connect either A–W or B–W as the variable resistance element while leaving the third terminal unconnected. In this mode, resistance varies from near-0 Ω (code 0x00 or 0xFF depending on terminal choice) to 10 kΩ (nominal RAB). Wiper resistance is 50–100 Ω (VDD = 5 V), ensuring minimal insertion loss in current-sensing or gain-setting applications.
What is the resistance matching tolerance between the two channels of AD8402AR10-REEL?
AD8402AR10-REEL guarantees ±1% channel-to-channel resistance matching (ΔR/RAB) at 25°C, with a typical value of 0.2%. This tight matching enables precision differential functions such as balanced gain adjustment, common-mode rejection tuning, and matched filter coefficients - critical in instrumentation amplifiers and bridge sensor interfaces where ratio-metric accuracy matters more than absolute resistance value.
AD8402AR10-REEL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 14-SOIC (0.154", 3.90mm 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-SOIC
- Operating Temperature:
- -40°C ~ 125°C
- Resistance - Wiper (Ohms) (Typ):
- 200
AD8402AR10-REEL FAQ
1.How can I place an order for AD8402AR10-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for AD8402AR10-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 AD8402AR10-REEL reliable?
The price and inventory of AD8402AR10-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD8402AR10-REEL is usually 5 days.
3.What payment methods are accepted for AD8402AR10-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD8402AR10-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD8402AR10-REEL?
AD8402AR10-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD8402AR10-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 AD8402AR10-REEL?
For technical support, including AD8402AR10-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD8402AR10-REEL requirements.
6.How does Aetrix verify that AD8402AR10-REEL is sourced from the original manufacturer or authorized distributors?
All AD8402AR10-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 AD8402AR10-REEL meets industry standards.
7.What is the process for return or replacement of AD8402AR10-REEL?
All AD8402AR10-REEL units undergo pre-shipment inspection (PSI). If there is an issue with AD8402AR10-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 AD8402AR10-REEL part is unused and in its original packaging.
Return procedure for AD8402AR10-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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