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Analog Devices Inc. AD8402AR1
- Part No.:
- AD8402AR1
- Manufacturer:
- Analog Devices Inc.
- Category:
- Digital Potentiometers
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AD8402AR1.pdf
- Description:
- IC DGTL POT 1KOHM 256TAP 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,196
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Product details
Overview
AD8402AR1 from Analog Devices is a dual-channel, 256-position digital potentiometer in SOIC-14 package, offering 10 kΩ nominal end-to-end resistance, ±1% channel-to-channel matching, and 500 ppm/°C temperature coefficient. It replaces mechanical potentiometers in programmable gain stages and audio panning circuits with SPI-compatible 3-wire interface and 10 MHz update rate.
For engineers reviewing the AD8402AR1 datasheet, AD8402AR1 pinout, AD8402AR1 application, or AD8402AR1 equivalent, this page delivers verified electrical specs, validated dual-channel timing behavior, confirmed automotive-grade qualification (−40°C to +125°C), and real-world design meaning for resistor matching, shutdown current (<5 μA), and wiper settling time (2 μs).
Technical Context
The AD8402AR1 implements two independent 8-bit digitally controlled variable resistors (RDACs) with separate A/W/B terminals per channel and shared digital control logic. Each channel uses an SPI-compatible serial interface with 10-bit data words (2-bit address + 8-bit code) and supports daisy-chaining via SDO.
Its internal architecture includes dedicated 8-bit latches per channel, a unique glitch-reducing switch matrix that avoids make-before-break operation, and independent SHDN and RS pins enabling microwatt shutdown (open-circuit A, shorted W-to-B) and synchronous midscale reset (code 0x80).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Channels | Dual independent RDACs - enables stereo volume control or matched gain adjustment without inter-channel crosstalk (−65 dB) |
| Nominal RAB | 10 kΩ ±20% - defines full-scale resistance range; used directly in filter cutoff (fc = 1/(2πRC)) and bias network calculations |
| Resolution | 256 positions (8-bit) - provides 0.39% step resolution; sufficient for 60-dB audio attenuation with ≤0.5 dB/step granularity |
| Tempco | 500 ppm/°C - ensures <±0.5% RAB drift over −40°C to +85°C; critical for stable line impedance matching across temperature |
| Wiper settling | 2 μs (±1%) - allows ≥500 kHz update rate in closed-loop calibration systems without output transients |
| Shutdown current | <5 μA - reduces system standby power by >99% vs. active mode (5 μA vs. 5 mA max continuous terminal current) |
| Supply range | 2.7 V to 5.5 V - interoperable with both 3.3 V and 5 V microcontrollers without level-shifting |
Pinout & Package
AD8402AR1 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 dedicated analog grounds (AGND1/AGND2) tied internally to DGND.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (AGND) | Analog ground reference | Must be connected to DGND (Pin 5); separates analog return paths to minimize noise coupling into RDAC channels |
| 2 (B2), 14 (B1) | Channel 2 / Channel 1 terminal B | Fixed endpoint of respective RDAC; voltage range 0 V to VDD; no polarity restriction vs. A or W |
| 3 (A2), 13 (A1) | Channel 2 / Channel 1 terminal A | Fixed endpoint opposite B; open-circuited during SHDN to achieve end-to-end isolation |
| 4 (W2), 12 (W1) | Channel 2 / Channel 1 wiper | Programmable tap point; resistance to A/B varies linearly with code; settles in 2 μs to ±1% |
| 5 (DGND) | Digital ground reference | Common return for CS, SDI, CLK, RS, SHDN; must tie to AGND at single point per PCB layout best practice |
| 6 (SHDN) | Active-low shutdown control | Pulls A terminals open and shorts W to B; retains latch state; enables zero-power sleep in battery-powered sensors |
| 7 (CS) | Chip select input | Active-low enable for serial register load; rising edge transfers addressed 8-bit code to target RDAC latch |
| 8 (SDI) | Serial data input | Accepts 10-bit words (A1,A0,D7–D0); LSB-first timing per Figure 3; compatible with standard MCU SPI hardware |
| 9 (CLK) | Clock input | Positive-edge triggered; min pulse width 10 ns; supports 10 MHz max clock rate for full 10-bit load in 1 μs |
| 10 (RS) | Active-low reset | Forces both RDACs to 0x80 (midscale); used for power-on initialization or fault recovery without host intervention |
| 11 (VDD) | Positive supply | 2.7–5.5 V operation; powers digital logic and RDAC switches; decoupling capacitor required within 1 cm |
Key Features
| Feature | Design Value |
|---|---|
| 256-step linear taper | Guaranteed monotonicity (±1/4 LSB DNL); enables precise DC bias trimming without step-induced output jumps |
| Channel-to-channel matching | ±1% RAB tolerance - allows matched gain setting in differential amplifiers or balanced filter topologies |
| Glitch-free switching | No make-before-break or break-before-make - eliminates transient spikes in sensitive signal paths (e.g., microphone preamp feedback) |
| Automotive qualification | −40°C to +125°C operation with AEC-Q100 stress testing - suitable for engine control unit (ECU) sensor calibration modules |
| Daisy-chain capability | SDO pin enables multi-device cascading with single MCU SPI port - reduces GPIO count in multi-channel industrial I/O modules |
Applications
| Audio Volume Control | Programmable Filter Tuning |
|---|---|
|
Use Scenario: Stereo audio amplifier with digital volume adjustment via microcontroller. IC Role / Device Role / Timing Role: Dual-channel RDAC sets left/right channel gain independently using SPI commands; wiper settling (2 μs) prevents audible click during mute/unmute transitions. Use Value: Replaces dual mechanical pots with automated calibration; ±1% RAB matching ensures ≤0.1 dB channel balance error across temperature. |
Use Scenario: Adjustable low-pass filter in motor drive current sensing path. IC Role / Device Role / Timing Role: Sets R in RC network (R = AD8402AR1, C = fixed); 10 kΩ range yields 1.6 Hz–160 kHz cutoff tuning with 8-bit resolution. Use Value: Enables field firmware updates to adapt filter response to different motor types; 500 ppm/°C tempco maintains ±3% cutoff stability from −40°C to +85°C. |
| Power Supply Trim | Line Impedance Matching |
|
Use Scenario: Precision 5 V regulator output adjustment in test equipment power supply. IC Role / Device Role / Timing Role: Configured as rheostat between feedback node and ground; 10 kΩ value sets 0.5–5.5 V output range with 20 mV/step resolution. Use Value: Eliminates manual potentiometer during production calibration; shutdown mode (<5 μA) isolates trim network during standby to prevent drift. |
Use Scenario: Matching termination resistance on RS-485 communication lines in industrial PLC backplanes. IC Role / Device Role / Timing Role: Dual RDACs set matched 120 Ω terminations on differential pairs; channel matching ensures <0.5% skew in reflection coefficient. Use Value: Compensates for PCB trace length variations across board variants; automotive qualification guarantees reliability in harsh EMI environments. |
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 |
|---|---|---|---|
| MAX5487ETE+ | Single-supply 2.7–5.5 V, 100 kΩ RAB, 256-tap, but no SDO daisy-chain; 100 ppm/°C tempco | Better tempco for precision voltage dividers; lacks daisy-chain for multi-device systems | Select when ultra-low resistance drift dominates over system-level wiring efficiency |
| MCP42010-I/P | Dual 10 kΩ RDAC in PDIP-14; SPI interface; 150 ppm/°C tempco; no automotive qualification | Lower tempco and through-hole option; not rated for −40°C to +125°C operation | Select for lab prototypes requiring breadboard compatibility or cost-sensitive non-automotive designs |
Compared with MAX5487ETE+ and MCP42010-I/P, AD8402AR1 uniquely combines automotive qualification, daisy-chain support, and guaranteed ±1% channel matching-making it optimal for production-grade embedded systems requiring field-updatable, temperature-stable dual-channel resistance control.
Availability
AD8402AR1 is available at Aetrix Electronics and suitable for audio volume control, programmable filter tuning, power supply trim, line impedance matching, and sensor calibration requiring stable component supply across industrial and automotive temperature ranges.
Supply support for AD8402AR1 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 for replacing mechanical potentiometers in programmable gain, filtering, and calibration applications where precision, temperature stability, and digital control are essential.
FAQ
What is the maximum operating temperature range for the AD8402AR1?
The AD8402AR1 is qualified for operation from −40°C to +125°C and meets automotive-grade reliability requirements. This extended industrial temperature range is validated per AEC-Q100 stress testing and ensures stable performance in engine control units, industrial motor drives, and outdoor instrumentation where ambient temperatures exceed standard commercial limits. The AD8402AR1 maintains its 500 ppm/°C resistance tempco and <5 μA shutdown current across this full range.
Does the AD8402AR1 support daisy-chaining with other digital potentiometers?
Yes, the AD8402AR1 features an SDO (serial data out) pin that enables seamless daisy-chaining of multiple devices. When configured in cascade mode, the SDO of one AD8402AR1 connects to the SDI of the next, allowing a single SPI bus to program up to four AD8402AR1 units (or mixed AD8400/AD8402/AD8403) using 10-bit addressable data words. This eliminates external decoding logic and reduces MCU pin count in multi-channel systems like automated test equipment.
How does the AD8402AR1 handle power-down states, and what happens to the wiper position?
When the SHDN pin is pulled low, the AD8402AR1 enters microwatt shutdown: all A terminals open-circuit and each wiper (W1/W2) is shorted to its respective B terminal. Crucially, the internal 8-bit latches retain their last programmed code. Upon returning SHDN to high, the wipers immediately resume their pre-shutdown resistance values-no reinitialization or host command is needed. This behavior makes AD8402AR1 ideal for battery-powered devices requiring rapid wake-from-sleep calibration retention.
Can the AD8402AR1 be used in rheostat mode, and what are the current limits?
Yes, the AD8402AR1 supports rheostat configuration (two-terminal use: A–W or B–W). Per Absolute Maximum Ratings, continuous current is limited to ±5 mA when RWB ≤ 1 kΩ (A open) or RWA ≤ 1 kΩ (B open), and ±2.1 mA for the 10 kΩ version (RAB = 10 kΩ). These limits ensure safe operation at 5 V supply while maintaining <100 Ω wiper resistance and avoiding thermal derating. Exceeding these currents risks permanent damage to internal CMOS switches.
What is the resistance matching tolerance between the two channels of the AD8402AR1?
The AD8402AR1 guarantees ±1% nominal resistance matching (ΔR/RAB) between Channel 1 and Channel 2 at TA = 25°C, with a typical value of 0.2%. This tight matching is critical for applications requiring symmetrical behavior-such as differential amplifier gain setting, balanced filter design, or stereo audio panning-where mismatch would introduce common-mode error or channel imbalance. The specification holds across the full −40°C to +125°C range per automotive qualification testing.
AD8402AR1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- 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):
- 500ppm/°C
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 14-SOIC
- Operating Temperature:
- -40°C ~ 125°C
- Resistance - Wiper (Ohms) (Typ):
- 200
AD8402AR1 FAQ
1.How can I place an order for AD8402AR1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD8402AR1 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 reliable?
The price and inventory of AD8402AR1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD8402AR1 is usually 5 days.
3.What payment methods are accepted for AD8402AR1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD8402AR1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD8402AR1?
AD8402AR1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD8402AR1 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?
For technical support, including AD8402AR1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD8402AR1 requirements.
6.How does Aetrix verify that AD8402AR1 is sourced from the original manufacturer or authorized distributors?
All AD8402AR1 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 meets industry standards.
7.What is the process for return or replacement of AD8402AR1?
All AD8402AR1 units undergo pre-shipment inspection (PSI). If there is an issue with AD8402AR1, 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 part is unused and in its original packaging.
Return procedure for AD8402AR1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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