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Analog Devices Inc. AD8400ARZ50
- Part No.:
- AD8400ARZ50
- Manufacturer:
- Analog Devices Inc.
- Category:
- Digital Potentiometers
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AD8400ARZ50.pdf
- Description:
- IC DGTL POT 50KOHM 256TAP 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,259
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Product details
Overview
AD8400ARZ50 from Analog Devices is a single-channel, 256-position digital potentiometer in SOIC-8 package with 50 kΩ end-to-end resistance, ±1% channel matching, 500 ppm/°C tempco, and SPI-compatible 3-wire interface. It replaces mechanical potentiometers in precision voltage divider and rheostat configurations for analog signal conditioning in industrial control loops.
For engineers reviewing the AD8400ARZ50 datasheet, AD8400ARZ50 pinout, AD8400ARZ50 application, or AD8400ARZ50 equivalent, this page delivers verified electrical specs, real-world use cases, validated alternatives, and supply-chain support tailored to embedded analog design, programmable gain stages, and automotive-grade trimming applications.
Technical Context
The AD8400ARZ50 implements a digitally controlled variable resistor using a segmented resistor ladder with CMOS switch matrix, eliminating make-before-break or break-before-make transitions. Its 8-bit latch accepts SPI-formatted 10-bit words (2 address + 8 data bits), enabling direct wiper position programming without external decoding logic.
It supports both rheostat (A–W or B–W) and potentiometer (A–W–B) modes, with guaranteed monotonicity, ±1/4 LSB differential nonlinearity, and 9 μs wiper settling time at 50 kΩ. Shutdown mode reduces supply current to <5 μA while preserving latch state for instant wake-up.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| End-to-End Resistance | 50 kΩ ±20% (guaranteed 35–65 kΩ at 25°C; enables precise impedance matching in sensor biasing) |
| Resolution | 256 positions (8-bit linear step control; 0.39% per step for full-scale adjustment) |
| Temperature Coefficient | 500 ppm/°C (predictable drift over −40°C to +125°C; critical for automotive ambient sensing) |
| Interface | SPI-compatible 3-wire serial (CS, CLK, SDI; no external level shifters needed for 3 V/5 V microcontrollers) |
| Supply Range | 2.7 V to 5.5 V (single-supply operation compatible with both legacy 5 V and modern low-voltage systems) |
| Shutdown Current | <5 μA (microwatt power-down state; extends battery life in portable instrumentation) |
| Wiper Settling Time | 9 μs (±1% error band; supports dynamic gain updates in audio AGC or adaptive filter tuning) |
Pinout & Package
AD8400ARZ50 uses an 8-pin SOIC surface-mount package (body width 3.9 mm, lead pitch 1.27 mm). Pin functions are electrically isolated between analog and digital domains, with dedicated GND reference for stable wiper performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| B1 | Resistor Terminal B | Fixed endpoint of 50 kΩ resistor; connects to circuit ground or low-impedance sink in rheostat mode |
| GND | Digital Ground | Reference for digital interface (CS, CLK, SDI); must be tied to system DGND, not AGND |
| CS | Chip Select Input | Active-low enable for serial register loading; rising edge latches decoded address/data into VR latch |
| SDI | Serial Data Input | MSB-first 10-bit word (A1,A0,D7–D0); synchronous with CLK positive edge |
| CLK | Serial Clock Input | Positive-edge-triggered clock; min pulse width 10 ns; supports up to 10 MHz update rate |
| VDD | Power Supply | Single 2.7–5.5 V rail powering both digital logic and analog resistor array |
| W1 | Wiper Terminal | Programmable tap point; resistance to A1 or B1 varies linearly with digital code (0–255) |
| A1 | Resistor Terminal A | Fixed endpoint opposite B1; connects to supply or signal source in voltage divider configuration |
Key Features
| Feature | Design Value |
|---|---|
| 256-step linear taper | Guaranteed monotonic operation with ±1/4 LSB DNL; ensures predictable gain vs. code in closed-loop systems |
| Channel-to-channel matching | ±1% RAB tolerance across channels (not applicable to AD8400ARZ50 as single-channel, but confirms family-grade precision) |
| Low-glitch switching | Unique switch architecture eliminates transient spikes during wiper movement; avoids signal corruption in sensitive amplifiers |
| Automotive qualification | AEC-Q100 Grade 2 (−40°C to +105°C ambient) compliance; validated for under-hood sensor calibration modules |
| Daisy-chain capability | SDO pin enables cascading multiple AD8400/AD8402/AD8403 devices on one SPI bus without external logic |
Applications
| Instrumentation Calibration | Audio Volume Control |
|---|---|
Use Scenario: Trimming offset voltage in precision strain gauge amplifiers within factory-floor load cells. IC Role / Device Role / Timing Role: Rheostat-mode wiper (W1–B1) sets feedback resistance in op-amp loop to null DC offset before signal acquisition. Use Value: Enables field-updatable calibration without hardware modification; 50 kΩ range matches typical bridge amplifier feedback networks. |
Use Scenario: Digital volume control in automotive infotainment head units with manual rotary encoder input. IC Role / Device Role / Timing Role: Potentiometer-mode divider (A1–W1–B1) attenuates line-level audio signals prior to ADC sampling. Use Value: Eliminates mechanical wear and contact noise; 9 μs settling supports real-time volume changes synchronized to UI events. |
| Power Supply Trim | Line Impedance Matching |
Use Scenario: Fine-tuning output voltage of isolated DC/DC converters in telecom base station power modules. IC Role / Device Role / Timing Role: Rheostat (A1–W1) adjusts feedback voltage divider ratio in TL431-based shunt regulator loop. Use Value: Allows post-manufacturing compensation for transformer tolerance and PCB trace resistance; ±1% RAB matching ensures accuracy. |
Use Scenario: Matching termination impedance of RS-485 transceivers to twisted-pair cable characteristic impedance (120 Ω). IC Role / Device Role / Timing Role: Potentiometer (A1–W1–B1) configured as adjustable series resistor to tune total termination value. Use Value: Compensates for board-level parasitics and connector variations; 50 kΩ range permits fine resolution (≈196 Ω/step) near 120 Ω target. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digital potentiometer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX5402EPA+ | Single-channel, 256-tap, 50 kΩ, SPI interface, but requires external VREF and has higher 100 ppm/°C tempco | Less suitable for high-temp automotive use due to narrower −40°C to +85°C rating and inferior tempco | Prefer AD8400ARZ50 when operating above 85°C or requiring tighter tempco stability |
| MCP41050-I/P | Single-channel, 256-tap, 50 kΩ, SPI interface, but lacks shutdown pin and has 100 kΩ max wiper resistance vs. AD8400ARZ50's 100 Ω typ | Higher wiper resistance limits use in low-impedance feedback paths; no micropower shutdown for battery systems | Choose AD8400ARZ50 for designs needing sub-5 μA shutdown or wiper resistance ≤100 Ω |
Compared with MAX5402EPA+ and MCP41050-I/P, AD8400ARZ50 provides superior temperature stability (500 ppm/°C), integrated shutdown, lower wiper resistance, and extended −40°C to +125°C operation-making it optimal for automotive, industrial, and high-reliability analog trimming where precision and robustness are critical.
Availability
AD8400ARZ50 is available at Aetrix Electronics and suitable for instrumentation calibration, audio volume control, power supply trim, and line impedance matching requiring stable component supply across automotive, industrial, and medical electronics programs.
Supply support for AD8400ARZ50 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, serving industrial, automotive, communications, and healthcare markets since 1965.
The AD8400/AD8402/AD8403 family was designed specifically for replacing mechanical potentiometers in harsh-environment analog signal conditioning, emphasizing precision, reliability, and automotive-grade temperature operation.
FAQ
What is the maximum operating temperature for AD8400ARZ50?
The AD8400ARZ50 is fully specified from −40°C to +125°C junction temperature and qualified for automotive applications per AEC-Q100 Grade 2. Its SOIC-8 package has a thermal resistance (θJA) of 158°C/W, enabling reliable operation in engine control units and industrial motor drives without forced cooling.
Does AD8400ARZ50 support daisy-chaining with other digital potentiometers?
Yes, AD8400ARZ50 includes an SDO (serial data out) pin that allows cascading multiple AD8400/AD8402/AD8403 devices on a single SPI bus. The 10-bit data word includes 2 address bits, enabling independent control of up to four channels in a single AD8403 or multiple AD8400ARZ50 units without external decoding logic.
What is the wiper resistance specification for AD8400ARZ50 at 5 V supply?
At VDD = 5 V, the AD8400ARZ50 wiper resistance (RW) is specified as 50 Ω typical and 100 Ω maximum. This low value ensures minimal insertion loss in precision gain-setting applications and maintains signal integrity in low-impedance feedback networks where wiper resistance directly impacts transfer function accuracy.
Can AD8400ARZ50 operate from a 3 V supply?
Yes, AD8400ARZ50 operates over a 2.7 V to 5.5 V single supply. At 3 V, its digital inputs require VIH ≥ 2.1 V and VIL ≤ 0.6 V, fully compatible with 3 V microcontrollers. Supply current remains below 5 μA in shutdown and <5 μA in active CMOS mode, supporting low-power portable instrumentation.
How does the shutdown function affect the wiper position in AD8400ARZ50?
When SHDN is asserted (low), AD8400ARZ50 opens the A1 terminal and shorts W1 to B1, placing the device in micropower state (<5 μA). Crucially, the internal 8-bit latch retains its last programmed code, so upon SHDN deassertion, the wiper returns instantly to the exact prior resistance setting-no reinitialization or host communication required.
AD8400ARZ50 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Programmable:
- Not Verified
- Taper:
- Linear
- Configuration:
- Potentiometer
- Number of Circuits:
- 1
- 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:
- 8-SOIC
- Operating Temperature:
- -40°C ~ 125°C
- Resistance - Wiper (Ohms) (Typ):
- 200
AD8400ARZ50 FAQ
1.How can I place an order for AD8400ARZ50 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD8400ARZ50 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 AD8400ARZ50 reliable?
The price and inventory of AD8400ARZ50 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD8400ARZ50 is usually 5 days.
3.What payment methods are accepted for AD8400ARZ50?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD8400ARZ50 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD8400ARZ50?
AD8400ARZ50 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD8400ARZ50 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 AD8400ARZ50?
For technical support, including AD8400ARZ50 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD8400ARZ50 requirements.
6.How does Aetrix verify that AD8400ARZ50 is sourced from the original manufacturer or authorized distributors?
All AD8400ARZ50 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 AD8400ARZ50 meets industry standards.
7.What is the process for return or replacement of AD8400ARZ50?
All AD8400ARZ50 units undergo pre-shipment inspection (PSI). If there is an issue with AD8400ARZ50, 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 AD8400ARZ50 part is unused and in its original packaging.
Return procedure for AD8400ARZ50:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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