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Analog Devices Inc. AD8402AR50-REEL
- Part No.:
- AD8402AR50-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Digital Potentiometers
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AD8402AR50-REEL.pdf
- Description:
- IC DGTL POT 50KOHM 256TAP 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,712
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Product details
Overview
AD8402AR50-REEL from Analog Devices is a dual-channel, 256-position digital potentiometer in SOIC-14 package, with 50 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 9 μs wiper settling time-ideal for precision gain/offset trimming in industrial sensor signal conditioning circuits.
For engineers reviewing the AD8402AR50-REEL datasheet, AD8402AR50-REEL pinout, AD8402AR50-REEL application, or AD8402AR50-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 and packaging differences.
Technical Context
The AD8402AR50-REEL implements two independent 8-bit digitally controlled variable resistors (VRs), each with its own 8-bit latch updated via a 10-bit serial data word (2 address bits + 8 data bits). Its unique switching circuit eliminates make-before-break and break-before-make glitches during wiper transitions, ensuring monotonic resistance change across all 256 positions.
Each VR supports both rheostat (A–W or B–W) and potentiometer divider (A–W–B) configurations. The SHDN pin forces A-terminal open-circuit and shorts W to B, reducing supply current to ≤5 μA; RS pin resets both wipers to midscale (code 0x80) independently of power state.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal RAB | 50 kΩ ±15% at 25°C - defines full-scale resistance range for gain scaling and bias setting in analog front-ends. |
| Resolution | 8-bit (256 steps) - enables 0.39% incremental resistance adjustment per step for fine-tuning calibration loops. |
| Rheostat DNL | ±0.25 LSB - guarantees monotonic wiper movement without step reversals, critical for closed-loop stability. |
| VW Settling Time | 9 μs (±1% error band, 50 kΩ version) - determines minimum update rate in dynamic compensation networks. |
| Supply Range | 2.7 V to 5.5 V - supports direct interfacing with 3.3 V and 5 V microcontrollers without level-shifting. |
| Tempco | 500 ppm/°C - limits resistance drift to ±2.5% over −40°C to +125°C, enabling use in under-hood automotive modules. |
| Shutdown Current | <5 μA - allows low-power sleep modes in battery-operated instrumentation without disconnecting analog paths. |
| Interface | SPI-compatible 3-wire (CS, CLK, SDI), 10 MHz max clock - compatible with standard MCU SPI peripherals using software bit-banging or hardware master mode. |
Pinout & Package
AD8402AR50-REEL is housed in a 14-lead SOIC surface-mount package (body width 3.9 mm, JEDEC MS-012). Pin functions are electrically isolated per channel, with shared digital control lines and separate analog ground connections.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (AGND) | Analog Ground Reference | Must be connected to DGND; separates analog return paths for noise-sensitive resistor terminals. |
| 2 (B2), 14 (B1) | Resistor Terminal B (Channel 2 / Channel 1) | Fixed endpoint of 50 kΩ resistor string; voltage range 0 V to VDD. |
| 3 (A2), 13 (A1) | Resistor Terminal A (Channel 2 / Channel 1) | Fixed endpoint opposite B; polarity agnostic-supports bidirectional voltage applications. |
| 4 (W2), 12 (W1) | Wiper Output (Channel 2 / Channel 1) | Digitally positioned tap point; resistance to A/B varies linearly with code; max continuous current ±540 μA. |
| 5 (DGND) | Digital Ground Return | Reference for CS, CLK, SDI, RS, SHDN; must tie to AGND at single point near device. |
| 6 (SHDN) | Active-Low Shutdown Control | Puts both channels into micropower state: A opens, W shorts to B; retains last wiper position in latch. |
| 7 (CS) | Chip Select Input | Active-low enable for serial register loading; rising edge latches address/data into selected VR latch. |
| 8 (SDI) | Serial Data Input | MSB-first 10-bit word: bits B9–B8 = channel address (00=CH1, 01=CH2); B7–B0 = wiper code. |
| 9 (CLK) | Serial Clock Input | Positive-edge triggered; min pulse width 10 ns; supports up to 10 MHz update rate for rapid reconfiguration. |
| 10 (RS) | Active-Low Reset | Forces both wipers to code 0x80 (midscale) regardless of supply or shutdown state. |
| 11 (VDD) | Positive Supply | Single 2.7–5.5 V rail powers digital logic and analog resistor array; no separate analog/digital supplies required. |
Key Features
| Feature | Design Value |
|---|---|
| 256-step linear taper | Enables precise, repeatable resistance adjustment without mechanical wear-replaces dual mechanical pots in automated test equipment. |
| Channel-to-channel matching | ±1% RAB tolerance between CH1 and CH2 ensures matched gain in differential amplifier feedback networks. |
| No-glitch switching architecture | Eliminates transient shorts/opens during wiper transitions-prevents output spikes in active filter tuning circuits. |
| Automotive qualification | Rated for −40°C to +125°C operation and qualified per AEC-Q100, supporting engine control and ADAS sensor interfaces. |
| Daisy-chain capable | SDO pin allows cascading multiple AD8402 units on one SPI bus without external decoding logic or GPIO expansion. |
Applications
| Instrumentation Gain Calibration | Audio Channel Panning |
|---|---|
Use Scenario: Programmable gain stage in a 24-bit precision ADC front-end for pressure transducers. IC Role / Device Role / Timing Role: Dual-channel AD8402AR50-REEL sets matched feedback resistances in two identical inverting op-amp stages for differential signal conditioning. Use Value: Enables factory and field calibration via microcontroller without manual pot adjustment; ±1% matching reduces common-mode error by >30 dB. |
Use Scenario: Stereo audio mixer with digital balance control in professional audio interface. IC Role / Device Role / Timing Role: AD8402AR50-REEL configures left/right channel attenuation in logarithmic taper emulation mode (via firmware lookup table). Use Value: Replaces dual mechanical pots with zero-drift, ESD-hardened digital control; 9 μs settling avoids audible zipper noise during real-time panning. |
| Power Supply Trim | Line Impedance Matching |
Use Scenario: Adjustable 5 V LDO output voltage in an industrial PLC I/O module. IC Role / Device Role / Timing Role: AD8402AR50-REEL acts as programmable resistor in feedback divider of TL431-based shunt regulator. Use Value: Allows remote firmware updates to correct for aging or temperature-induced output drift; shutdown mode cuts quiescent current to <5 μA during standby. |
Use Scenario: Termination resistor tuning for RS-485 communication lines in variable-length factory automation networks. IC Role / Device Role / Timing Role: AD8402AR50-REEL dynamically adjusts termination resistance (120 Ω target) to compensate for cable length and stub effects. Use Value: Maintains signal integrity across 100–1200 m distances; 500 ppm/°C tempco ensures stable impedance over ambient temperature swings. |
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, 50 kΩ, TDFN-16 package; I²C interface only; no SHDN or RS pins. | Lacks hardware reset and shutdown-requires firmware-managed initialization and power gating. | Choose when board space is constrained and I²C is preferred over SPI; verify system-level reset sequence compatibility. |
| MCP42050-I/P | Dual 50 kΩ, PDIP-14 package; SPI interface; 10-bit resolution; no daisy-chain SDO. | Higher resolution but larger through-hole footprint; no serial output limits multi-device SPI topology. | Select for legacy through-hole designs requiring finer 1024-step adjustment; avoid if daisy-chaining >2 devices is needed. |
Compared with MAX5482ETE+ and MCP42050-I/P, AD8402AR50-REEL uniquely combines SPI daisy-chaining, hardware shutdown/reset, SOIC-14 surface-mount compatibility, and automotive temperature rating-making it optimal for space-constrained, high-reliability embedded systems requiring robust digital trimming.
Availability
AD8402AR50-REEL is available at Aetrix Electronics and suitable for industrial sensor signal conditioning, automotive body electronics, audio equipment manufacturing, and medical diagnostic instrument production requiring stable component supply across extended temperature ranges.
Supply support for AD8402AR50-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 tempco, monotonicity, and robust serial interface reliability in harsh environments.
FAQ
What is the maximum operating temperature for AD8402AR50-REEL?
AD8402AR50-REEL is rated for continuous operation from −40°C to +125°C and is qualified for automotive applications per AEC-Q100. This extended industrial temperature range ensures reliable performance in engine control units, under-hood sensors, and industrial motor drives where ambient temperatures exceed standard commercial limits. The 500 ppm/°C resistance temperature coefficient remains valid across this full range.
Does AD8402AR50-REEL support daisy-chaining with other digital potentiometers?
Yes, AD8402AR50-REEL includes an SDO (serial data out) pin that enables daisy-chaining multiple units on a single SPI bus. When the serial register is loaded, the 10-bit data word propagates from SDI to SDO, allowing up to four AD8402AR50-REEL devices to be controlled with one chip select line and no external decoding logic-reducing GPIO count and PCB routing complexity in multi-channel calibration systems.
Can AD8402AR50-REEL be used in rheostat mode with only two terminals?
Yes, AD8402AR50-REEL supports true rheostat configuration using any pair of terminals (A–W or B–W), with the third terminal left unconnected. In this mode, resistance varies linearly from near-zero (code 0x00) to 50 kΩ (code 0xFF), maintaining ±0.25 LSB differential nonlinearity. The wiper current limit is ±540 μA for the 50 kΩ version, defining safe operating boundaries for current-source or current-sink applications.
What happens to the wiper position during shutdown of AD8402AR50-REEL?
When SHDN is pulled low, AD8402AR50-REEL opens the A-terminal connection and shorts the wiper (W) to the B-terminal, entering a micropower state drawing ≤5 μA. Crucially, the internal 8-bit latch retains the last programmed wiper code. Upon returning SHDN to high, the wiper immediately resumes its pre-shutdown resistance value-enabling seamless power cycling without recalibration in portable or energy-harvesting systems.
Is AD8402AR50-REEL pin-compatible with other variants in the AD8402 family?
Yes, all AD8402 variants-including AD8402AR10-REEL (10 kΩ), AD8402AR100-REEL (100 kΩ), and AD8402AR1-REEL (1 kΩ)-share identical SOIC-14 pinout and electrical interface. Only the nominal end-to-end resistance differs; all retain the same 256-step resolution, timing specs, shutdown behavior, and temperature rating. This allows drop-in replacement during design iteration or cost optimization without layout changes.
AD8402AR50-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):
- 50k
- 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-SOIC
- Operating Temperature:
- -40°C ~ 125°C
- Resistance - Wiper (Ohms) (Typ):
- 200
AD8402AR50-REEL FAQ
1.How can I place an order for AD8402AR50-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for AD8402AR50-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 AD8402AR50-REEL reliable?
The price and inventory of AD8402AR50-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD8402AR50-REEL is usually 5 days.
3.What payment methods are accepted for AD8402AR50-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD8402AR50-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD8402AR50-REEL?
AD8402AR50-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD8402AR50-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 AD8402AR50-REEL?
For technical support, including AD8402AR50-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD8402AR50-REEL requirements.
6.How does Aetrix verify that AD8402AR50-REEL is sourced from the original manufacturer or authorized distributors?
All AD8402AR50-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 AD8402AR50-REEL meets industry standards.
7.What is the process for return or replacement of AD8402AR50-REEL?
All AD8402AR50-REEL units undergo pre-shipment inspection (PSI). If there is an issue with AD8402AR50-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 AD8402AR50-REEL part is unused and in its original packaging.
Return procedure for AD8402AR50-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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