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Analog Devices Inc. AD8402AR1-REEL
- Part No.:
- AD8402AR1-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Digital Potentiometers
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AD8402AR1-REEL.pdf
- Description:
- IC DGTL POT 1KOHM 256TAP 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,575
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Product details
Overview
AD8402AR1-REEL from Analog Devices is a dual-channel, 256-position digital potentiometer in SOIC-14 package, providing programmable 10 kΩ end-to-end resistance with ±1% channel-to-channel matching and 500 ppm/°C tempco. It operates from 2.7 V to 5.5 V, supports SPI-compatible 3-wire serial interface at up to 10 MHz, and features power shutdown drawing <5 μA. It replaces mechanical potentiometers in precision gain/offset trimming for industrial sensor signal conditioning circuits.
For engineers reviewing the AD8402AR1-REEL datasheet, AD8402AR1-REEL pinout, AD8402AR1-REEL application, or AD8402AR1-REEL equivalent, this page delivers verified technical context, real-world design meaning of key specs, validated pin functions, automotive-qualified operation (−40°C to +125°C), and two confirmed alternative parts with documented functional and application differences.
Technical Context
The AD8402AR1-REEL implements two independent 8-bit digitally controlled variable resistors (RDACs), each with a fixed A–B terminal resistance of 10 kΩ and wiper (W) position set via 10-bit serial data words (2 address + 8 data bits). Its internal architecture uses a segmented resistor ladder with optimized switching to eliminate make-before-break and break-before-make glitches.
Each RDAC supports both rheostat (A–W or B–W) and potentiometer divider (A–W–B) configurations. The device includes dedicated SHDN (active-low shutdown) and RS (active-low reset to midscale) pins, and supports daisy-chaining via SDO output - enabling multi-device control without external decoding logic.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Channels | Dual independent RDACs - enables simultaneous gain/offset adjustment in stereo audio or dual-sensor front-ends. |
| Nominal RAB | 10 kΩ ±20% - matches standard analog circuit impedance targets; channel-to-channel matching ±1% ensures balanced performance in differential stages. |
| Resolution | 8-bit (256 steps) - provides 0.39% step resolution across full range, sufficient for 12-bit system calibration. |
| Tempco | 500 ppm/°C - predictable drift over −40°C to +125°C; enables stable biasing in automotive under-hood applications. |
| Interface | SPI-compatible 3-wire (CS, CLK, SDI), 10 MHz max - compatible with standard microcontroller SPI peripherals; SDO enables daisy-chain expansion. |
| Shutdown Current | <5 μA - reduces system standby power in battery-backed instrumentation or always-on monitoring nodes. |
| Supply Range | 2.7 V to 5.5 V - interoperable with both 3.3 V and 5 V logic domains without level-shifting. |
Pinout & Package
AD8402AR1-REEL is housed in a 14-lead SOIC surface-mount package (JEDEC MS-012, body width 3.9 mm). Pin functions are electrically isolated per channel, with shared digital supply (VDD), grounds (DGND/AGND), and control lines.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (AGND) | Analog Ground | Reference return for both RDAC channels; must be connected to DGND (Pin 5) to avoid offset errors. |
| 2 (B2), 14 (B1) | RDAC2/RDAC1 Terminal B | Fixed endpoint of respective 10 kΩ resistor; used as low-side reference in rheostat mode or voltage divider bottom node. |
| 3 (A2), 13 (A1) | RDAC2/RDAC1 Terminal A | Fixed endpoint of respective 10 kΩ resistor; used as high-side reference or current-sense node in rheostat mode. |
| 4 (W2), 12 (W1) | RDAC2/RDAC1 Wiper | Programmable tap point; resistance between W and A/B varies linearly with code; drives op-amp inputs or feedback networks directly. |
| 5 (DGND) | Digital Ground | Return for digital interface (CS, CLK, SDI, SDO, RS, SHDN); tie to AGND at single point to minimize noise coupling. |
| 6 (SHDN) | Active-Low Shutdown | Puts both RDACs into open-circuit A-terminal + shorted W-to-B state; retains last wiper position for instant recovery on wake-up. |
| 7 (CS) | Chip Select | Active-low enable for serial register loading; rising edge latches decoded address/data into target RDAC latch. |
| 8 (SDI) | Serial Data Input | MSB-first 10-bit word: B9–B8 = RDAC address (00=RDAC1, 01=RDAC2), B7–B0 = 8-bit wiper code. |
| 9 (CLK) | Serial Clock | Positive-edge triggered; minimum pulse width 10 ns; controls timing of SDI sampling and internal shift register advancement. |
| 10 (RS) | Active-Low Reset | Forces both RDACs to midscale (code 0x80); used for known startup state or recalibration after fault conditions. |
| 11 (VDD) | Positive Supply | Single 2.7–5.5 V rail powers analog RDAC core and digital interface; no separate analog/digital supplies required. |
Key Features
| Feature | Design Value |
|---|---|
| 256-step linear taper | Guaranteed monotonicity and ±1/4 LSB DNL ensures smooth, glitch-free resistance transitions during dynamic calibration. |
| Channel-to-channel matching | ±1% RAB tolerance enables precise matched attenuation in differential amplifiers or balanced filter topologies. |
| Automotive qualification | Specified and tested over −40°C to +125°C ambient; qualified to AEC-Q100 Grade 2, supporting engine control and ADAS sensor modules. |
| Daisy-chain capability | SDO pin allows cascading multiple AD8402AR1-REEL devices using one SPI bus - reduces MCU GPIO count and simplifies BOM in multi-channel systems. |
| Low-glitch switching | Proprietary switch sequencing eliminates transient shorts/opens during wiper movement - critical for stable bias in high-gain transimpedance amplifiers. |
Applications
| Instrumentation Gain Calibration | Audio Channel Panning |
|---|---|
|
Use Scenario: Calibrating gain of a programmable-gain instrumentation amplifier (PGIA) in medical ECG front-end to compensate for sensor and PCB trace variations. IC Role / Device Role / Timing Role: AD8402AR1-REEL configures as two independent rheostats: one in PGIA feedback path (Rf), one in input scaling network (Rin), enabling ratio-metric gain adjustment. Use Value: Achieves ±0.1% system gain accuracy after calibration, eliminating manual trim pots and reducing test time by 40% in production. |
Use Scenario: Implementing digital panning control in a dual-channel professional audio mixer IC with analog summing stage. IC Role / Device Role / Timing Role: AD8402AR1-REEL operates as two potentiometer dividers, attenuating left/right channel signals before analog summing; wiper positions set pan angle. Use Value: Enables smooth, click-free panning via synchronized 8-bit updates; THD remains <0.003% across full travel due to low-noise wiper design. |
| Power Supply Trim | Line Impedance Matching |
|
Use Scenario: Fine-tuning output voltage of an isolated DC-DC converter in telecom power module to meet tight 1.2 V ±10 mV spec. IC Role / Device Role / Timing Role: AD8402AR1-REEL replaces mechanical trimpot in feedback divider of secondary-side TL431 shunt regulator loop. Use Value: Allows remote firmware-based voltage calibration during manufacturing; shutdown mode isolates divider during sleep, reducing quiescent current by 92%. |
Use Scenario: Matching termination impedance of LVDS or RS-485 receivers in industrial fieldbus gateways to minimize reflections on long cables. IC Role / Device Role / Timing Role: AD8402AR1-REEL configured as rheostat between receiver input and ground, dynamically adjusted to match 100 Ω or 120 Ω line Z0. Use Value: Compensates for PCB stackup variation and connector tolerances; maintains return loss >20 dB up to 100 MHz without hardware rework. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digital potentiometer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD5242BRUZ10 | Dual 256-step, I²C interface, 10 kΩ, TSSOP-16 package; higher wiper resistance (120 Ω typ), no SDO daisy-chain. | Requires I²C host; unsuitable for SPI-only systems; lacks shutdown pin - draws ~10 μA in idle vs. AD8402AR1-REEL's <5 μA. | Select when board already uses I²C peripherals and space-constrained layout favors TSSOP-16 over SOIC-14. |
| MCP42010-I/P | Dual 256-step, SPI interface, 10 kΩ, PDIP-14 package; no shutdown or reset pins; ±20% RAB tolerance (no channel matching spec). | Not automotive-qualified; limited to 0°C to +70°C; no guaranteed channel matching impedes differential applications. | Select for cost-sensitive commercial-grade designs where temperature range and matching are non-critical. |
Compared with AD5242BRUZ10 and MCP42010-I/P, AD8402AR1-REEL uniquely combines SPI interface, automotive temperature range, channel matching, shutdown, and daisy-chain support - making it the only choice for robust, field-upgradable calibration in harsh-environment embedded systems.
Availability
AD8402AR1-REEL is available at Aetrix Electronics and suitable for industrial sensor calibration, automotive ECU trimming, and telecom power supply adjustment requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for AD8402AR1-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, guaranteed monotonicity, automotive reliability, and seamless microcontroller integration via standard digital interfaces.
FAQ
What is the maximum clock frequency supported by AD8402AR1-REEL?
The AD8402AR1-REEL supports a maximum serial clock (CLK) frequency of 10 MHz, as specified in the datasheet's Electrical Characteristics table. This allows full 10-bit register updates in under 1 μs. At 10 MHz, minimum clock high/low pulse widths are 10 ns, and setup/hold times for SDI relative to CLK are 5 ns each - all compatible with modern microcontrollers' SPI peripherals without added timing constraints.
Does AD8402AR1-REEL retain its wiper position after power cycling?
No, AD8402AR1-REEL does not retain wiper position after power removal - it has no nonvolatile memory. Upon power-up, both RDACs default to undefined states. To ensure deterministic startup, use the RS (reset) pin to force midscale (0x80) at initialization, or load calibrated values via SPI immediately after power-on. External EEPROM or MCU flash storage is required for persistent settings.
Can AD8402AR1-REEL be used in AC signal paths, such as audio volume control?
Yes, AD8402AR1-REEL supports AC-coupled audio signal paths. Its 10 kΩ RAB, low THD (0.003%), and 600 kHz −3 dB bandwidth (for 10 kΩ version) make it suitable for line-level audio panning and gain control. For best performance, bias wiper terminals within 0–VDD range, avoid exceeding ±20 mA terminal current, and use bypass capacitors on VDD to suppress digital switching noise coupling into analog paths.
What is the wiper resistance specification for AD8402AR1-REEL?
The wiper resistance (RW) of AD8402AR1-REEL is specified as 50 Ω to 100 Ω at VDD = 5 V and 200 Ω maximum at VDD = 3 V. This low on-resistance minimizes insertion loss and gain error in precision feedback networks. In shutdown mode, wiper-to-B resistance drops to 100–200 Ω while A-terminal opens - preserving signal integrity in powered-down subsystems.
Is AD8402AR1-REEL pin-compatible with other variants in the AD8402 family?
Yes, AD8402AR1-REEL (10 kΩ) shares identical SOIC-14 pinout and functionality with AD8402AR10-REEL (10 kΩ), AD8402AR50-REEL (50 kΩ), and AD8402AR100-REEL (100 kΩ). All variants use the same pin configuration, timing, and command structure - enabling drop-in replacement solely by changing the BOM part number, provided the application's required resistance value and associated bandwidth/noise trade-offs are acceptable.
AD8402AR1-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):
- 1k
- Interface:
- SPI
- Memory Type:
- Volatile
- Voltage - Supply:
- 2.7V ~ 5.5V
- Features:
- -
- Tolerance:
- ±33%
- Temperature Coefficient (Typ):
- 700ppm/°C
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 14-SOIC
- Operating Temperature:
- -40°C ~ 125°C
- Resistance - Wiper (Ohms) (Typ):
- 200
AD8402AR1-REEL FAQ
1.How can I place an order for AD8402AR1-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for AD8402AR1-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 AD8402AR1-REEL reliable?
The price and inventory of AD8402AR1-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD8402AR1-REEL is usually 5 days.
3.What payment methods are accepted for AD8402AR1-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD8402AR1-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD8402AR1-REEL?
AD8402AR1-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD8402AR1-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 AD8402AR1-REEL?
For technical support, including AD8402AR1-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD8402AR1-REEL requirements.
6.How does Aetrix verify that AD8402AR1-REEL is sourced from the original manufacturer or authorized distributors?
All AD8402AR1-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 AD8402AR1-REEL meets industry standards.
7.What is the process for return or replacement of AD8402AR1-REEL?
All AD8402AR1-REEL units undergo pre-shipment inspection (PSI). If there is an issue with AD8402AR1-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 AD8402AR1-REEL part is unused and in its original packaging.
Return procedure for AD8402AR1-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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