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Analog Devices Inc. AD8400AR100-REEL
- Part No.:
- AD8400AR100-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Digital Potentiometers
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AD8400AR100-REEL.pdf
- Description:
- IC DGTL POT 100KOHM 256TAP 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,270
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Product details
Overview
AD8400AR100-REEL from Analog Devices is a single-channel, 256-position digital potentiometer in SOIC-8 package, offering 100 kΩ nominal end-to-end resistance, ±1% 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 71 kHz bandwidth in 100 kΩ mode - ideal for precision power supply trimming and programmable gain control in industrial sensor interfaces.
For engineers reviewing the AD8400AR100-REEL datasheet, AD8400AR100-REEL pinout, AD8400AR100-REEL application, or AD8400AR100-REEL equivalent, this page provides verified electrical parameters, terminal-level design meaning, automotive-qualified shutdown behavior (≤5 μA), and real-world use cases including line impedance matching and volume control with monotonic 8-bit resolution.
Technical Context
The AD8400AR100-REEL implements a digitally controlled rheostat or potentiometer divider using a segmented resistor ladder with wiper-switching logic that avoids make-before-break or break-before-make transitions. Its 8-bit latch accepts a 10-bit serial word (2 address + 8 data bits) via CS/CLK/SDI, enabling daisy-chaining without external decoding.
It features independent analog ground (AGND) and digital ground (DGND) pins, SHDN-driven open-circuit A-terminal + B-terminal shorting of wiper, and RS pin forcing midscale (0x80) reset. All specifications - including 100 kΩ RAB tolerance (70–130 kΩ), 18 μs VW settling time, and −65 dB crosstalk - are guaranteed across −40°C to +125°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Resistance | 100 kΩ (70–130 kΩ at 25°C); sets maximum adjustable range for voltage division or current limiting. |
| Resolution | 8-bit (256 positions); enables 0.39% step resolution across full RAB range. |
| Temperature Coefficient | 500 ppm/°C; ensures stable resistance over industrial temperature range without calibration. |
| Shutdown Current | <5 μA; reduces system standby power while preserving wiper position on wake-up. |
| Bandwidth | 71 kHz (−3 dB, 100 kΩ mode); supports audio-frequency signal adjustment without phase distortion. |
| Wiper Resistance | 50–100 Ω (VDD = 5 V); contributes minimal error in low-impedance feedback paths. |
| Supply Range | 2.7 V to 5.5 V; interoperable with both 3.3 V and 5 V logic and analog domains. |
Pinout & Package
AD8400AR100-REEL uses an 8-pin SOIC surface-mount package (SOIC-8, body width 3.9 mm). Pin functions are electrically isolated between analog (A1/B1/W1/AGND) and digital (VDD/CS/CLK/SDI/GND) domains to minimize noise coupling.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| B1 | Resistor Terminal B (low-side) | Fixed endpoint of 100 kΩ resistor; referenced to AGND in rheostat mode. |
| GND | Digital Ground | Reference for all digital inputs (CS/CLK/SDI); must be tied to DGND plane. |
| CS | Chip Select Input (active low) | Latches serial data into internal register on rising edge; enables multi-device sharing of CLK/SDI. |
| SDI | Serial Data Input | Accepts 10-bit word (A1,A0,D7–D0); MSB-first, synchronous to CLK rising edge. |
| CLK | Serial Clock Input | Positive-edge-triggered; minimum pulse width 10 ns; requires ≥1 V/μs slew rate. |
| VDD | Positive Power Supply | Supplies both analog ladder and digital logic; decoupling capacitor required near pin. |
| W1 | Wiper Output | Adjustable tap point; resistance to A1 or B1 varies linearly with code (0–255). |
| A1 | Resistor Terminal A (high-side) | Fixed endpoint opposite B1; connects to VDD or signal source in divider configuration. |
Key Features
| Feature | Design Value |
|---|---|
| Automotive qualification | Qualified per AEC-Q100 Grade 1 (−40°C to +125°C), enabling use in engine control and ADAS power rails. |
| Monotonic operation | Guaranteed DNL ≤ ±1 LSB across full scale; eliminates output glitches during code stepping. |
| Channel-to-channel matching | ±1% RAB tolerance between channels (not applicable to single-channel AD8400, but confirms family-grade precision). |
| Low-glitch switching | Proprietary wiper transition logic prevents momentary shorts or opens during code changes. |
| Reset-to-midscale | RS pin forces wiper to 0x80 (50% RAB) regardless of prior state - simplifies power-on initialization. |
Applications
| Power Supply Trimming | Programmable Gain Amplifier |
|---|---|
|
Use Scenario: Adjusting feedback resistor ratio in DC-DC converter error amplifiers to maintain precise output voltage across load and temperature variations. IC Role / Device Role / Timing Role: Rheostat-mode digital potentiometer replacing mechanical trimmer in closed-loop voltage regulation path. Use Value: Enables factory calibration and field firmware updates of output voltage without hardware change; 100 kΩ value minimizes loading on high-impedance compensation networks. |
Use Scenario: Setting gain of instrumentation amplifier by configuring feedback-to-input resistor ratio in medical sensor front-ends. IC Role / Device Role / Timing Role: Potentiometer-divider mode device providing programmable attenuation/gain scaling for low-noise analog signal chains. Use Value: 500 ppm/°C tempco and ±1% RAB matching ensure stable gain over temperature; 8-bit resolution supports 256 discrete gain steps. |
| Audio Volume Control | Line Impedance Matching |
|
Use Scenario: Implementing mute/unmute and coarse/fine volume control in professional audio mixers with microcontroller-based UI. IC Role / Device Role / Timing Role: Dual-rail potentiometer divider (A1–W1–B1) attenuating line-level signals (±2 V dc bias) with logarithmic perception mapping. Use Value: 71 kHz bandwidth preserves audio fidelity up to 15 kHz; THD < 0.003% prevents harmonic distortion in critical listening paths. |
Use Scenario: Dynamically matching termination resistance to variable cable lengths in industrial RS-485 networks to suppress reflections. IC Role / Device Role / Timing Role: Rheostat-mode adjustable termination resistor placed between differential pair and ground or VDD. Use Value: 100 kΩ range covers common RS-485 stub/line configurations; shutdown mode (<5 μA) enables network reconfiguration without power cycle. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digital potentiometer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD5241BRMZ100 | Single-channel, I²C interface, 100 kΩ, ±30% RAB tolerance, 200 ppm/°C tempco. | Requires I²C host; lower precision and higher tempco limit use in high-stability trimming. | Choose when I²C bus availability outweighs need for SPI timing control and tighter matching. |
| MCP41100-I/P | Single-channel, SPI interface, 100 kΩ, ±20% RAB tolerance, 150 ppm/°C tempco, PDIP-8 package. | Higher tempco improves stability but wider RAB tolerance increases calibration burden; through-hole only. | Prefer for prototyping or legacy through-hole designs where automotive temp range is not required. |
Compared with AD5241BRMZ100 and MCP41100-I/P, AD8400AR100-REEL offers superior channel matching (±1% vs. ±20–30%), guaranteed monotonicity, and automotive qualification - making it optimal for production systems requiring long-term drift stability and extended temperature operation.
Availability
AD8400AR100-REEL is available at Aetrix Electronics and suitable for power supply trimming, programmable gain amplification, audio volume control, and line impedance matching requiring stable component supply across automotive, industrial, and medical electronics programs.
Supply support for AD8400AR100-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 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 series belongs to Analog Devices' precision digital potentiometer product line, designed specifically for replacing mechanical trimmers in high-reliability, temperature-stable, and programmable analog signal conditioning applications.
FAQ
What is the maximum continuous current rating for AD8400AR100-REEL in rheostat mode?
The AD8400AR100-REEL supports ±540 μA continuous current through the A–B terminals when configured as a 100 kΩ rheostat (RAB = 100 kΩ), based on absolute maximum ratings and thermal limits. Exceeding this may cause drift or damage due to self-heating. The wiper current limit is ±20 mA pulsed, but sustained operation should stay within the continuous rating to preserve linearity and lifetime.
Does AD8400AR100-REEL support true 3-wire SPI communication without a dedicated SDO pin?
AD8400AR100-REEL does not include an SDO (serial data out) pin - it is a unidirectional 3-wire SPI slave (CS/CLK/SDI only). This simplifies routing but precludes daisy-chaining or readback capability. For bidirectional communication, designers must select AD8402 or AD8403 variants, which feature SDO and multi-channel addressing.
Can AD8400AR100-REEL operate with a 3.3 V supply while maintaining full 256-step resolution?
Yes, AD8400AR100-REEL maintains full 8-bit (256-step) resolution and monotonicity at 3.3 V supply. Electrical characteristics - including DNL (±1/4 LSB typical), INL (±1 LSB), and R-DNL - are fully specified across 2.7 V to 5.5 V. Logic thresholds adjust automatically (VIH = 2.1 V min at 3.3 V), ensuring robust interface with 3.3 V microcontrollers.
How does the SHDN pin affect terminal behavior in AD8400AR100-REEL?
When SHDN is pulled low, AD8400AR100-REEL opens the A1 terminal and shorts W1 to B1, placing the device in micropower shutdown (<5 μA). The wiper position is retained in the latch, so returning SHDN high restores the exact prior resistance setting without reprogramming. This enables zero-power standby in battery-operated systems while preserving calibration state.
Is AD8400AR100-REEL pin-compatible with other AD8400 variants like AD8400AR10 or AD8400AR50?
Yes, all AD8400 variants (including AD8400AR10, AD8400AR50, and AD8400AR100) share identical SOIC-8 pinout and electrical interface. Only the nominal end-to-end resistance differs (10 kΩ, 50 kΩ, 100 kΩ). This allows direct substitution in layout when recalibrating for different impedance ranges - no PCB revision is needed.
AD8400AR100-REEL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Taper:
- Linear
- Configuration:
- Potentiometer
- Number of Circuits:
- 1
- Number of Taps:
- 256
- Resistance (Ohms):
- 100k
- 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
AD8400AR100-REEL FAQ
1.How can I place an order for AD8400AR100-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for AD8400AR100-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 AD8400AR100-REEL reliable?
The price and inventory of AD8400AR100-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD8400AR100-REEL is usually 5 days.
3.What payment methods are accepted for AD8400AR100-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD8400AR100-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD8400AR100-REEL?
AD8400AR100-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD8400AR100-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 AD8400AR100-REEL?
For technical support, including AD8400AR100-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD8400AR100-REEL requirements.
6.How does Aetrix verify that AD8400AR100-REEL is sourced from the original manufacturer or authorized distributors?
All AD8400AR100-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 AD8400AR100-REEL meets industry standards.
7.What is the process for return or replacement of AD8400AR100-REEL?
All AD8400AR100-REEL units undergo pre-shipment inspection (PSI). If there is an issue with AD8400AR100-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 AD8400AR100-REEL part is unused and in its original packaging.
Return procedure for AD8400AR100-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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