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Analog Devices Inc. AD5280BRUZ20
- Part No.:
- AD5280BRUZ20
- Manufacturer:
- Analog Devices Inc.
- Category:
- Digital Potentiometers
- Package:
- 14-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
AD5280BRUZ20.pdf
- Description:
- IC DGT POT 20KOHM 256TAP 14TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:617
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Product details
Overview
AD5280BRUZ20 from Analog Devices is a single-channel, 256-position, I²C-compatible digital potentiometer with 20 kΩ fixed terminal resistance, ±5 V or +15 V supply operation, and 30 ppm/°C temperature coefficient-used for precision gain/offset adjustment in audio/video signal paths and programmable voltage sources.
For engineers reviewing the AD5280BRUZ20 datasheet, AD5280BRUZ20 pinout, AD5280BRUZ20 application, or AD5280BRUZ20 equivalent, this page delivers verified specifications, functional context, package mapping, real-world use cases, and validated alternatives-enabling rapid selection for industrial instrumentation, multimedia control, and bipolar analog interface designs.
Technical Context
The AD5280BRUZ20 implements an 8-bit digitally controlled resistor ladder with wiper position set via I²C two-wire interface (SCL/SDA), supporting standard-mode (400 kHz) timing and address configuration via AD0/AD1 pins. It operates in both rheostat (W–B or W–A) and potentiometer (A–W–B) modes, with midscale power-on preset and programmable shutdown.
Its internal architecture includes dual logic outputs (O1/O2), VL-referenced digital interface, and rail-to-rail analog terminal voltage range (VSS to VDD). The device achieves 5 ppm/°C voltage-divider temperature coefficient in potentiometer mode-significantly tighter than its 30 ppm/°C end-to-end resistance drift-due to ratio-matching of thin-film resistive elements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 8-bit (256 positions): enables 0.39% step resolution across full 20 kΩ range for fine analog tuning. |
| Terminal Resistance | 20 kΩ ±30%: fixed A–B resistance optimized for low-noise, moderate-bandwidth applications (BW = 310 kHz at 20 kΩ). |
| Supply Range | +4.5 V to +16.5 V single or ±4.5 V to ±5.5 V dual: supports direct integration into ±5 V or +12/+15 V systems without level-shifting. |
| Tempco (RAB) | 30 ppm/°C: ensures <±0.3% resistance drift over −40°C to +85°C, critical for stable gain calibration. |
| Interface | I²C-compatible (400 kHz max): allows daisy-chaining up to four devices using AD0/AD1 address bits; no external EEPROM needed for power-up state. |
| Wiper Resistance | 60 Ω to 150 Ω: contributes fixed offset in low-code settings; limits minimum achievable resistance in rheostat mode. |
| INL/DNL | ±1 LSB (typ): guarantees monotonicity and predictable linearity for closed-loop feedback and DAC-like voltage division. |
Pinout & Package
AD5280BRUZ20 is housed in a 14-lead TSSOP package (RU-14), 5.0 mm × 4.4 mm × 1.2 mm, with exposed pad for thermal enhancement and RoHS-compliant matte tin lead finish.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| A | Resistor Terminal A | High-side analog terminal; connects to reference voltage or signal source in potentiometer/rheostat configurations. |
| W | Wiper Terminal | Digitally selectable tap point; output node for voltage division or variable resistance path; carries 60–150 Ω switch resistance. |
| B | Resistor Terminal B | Low-side analog terminal; tied to ground or negative rail; forms complementary resistance RWA with A when W is active. |
| VDD | Positive Supply | Accepts +4.5 V to +16.5 V; powers analog core and internal logic; sum |VDD| + |VSS| ≤ 15 V in dual-supply mode. |
| SHDN | Active-Low Shutdown | Asynchronously shorts W to B and opens A; preserves RDAC register; doubles as programmable power-up preset control. |
| SCL | I²C Clock Input | Accepts standard-mode (≤400 kHz) clock; edge-triggered; requires external pull-up to VL. |
| SDA | I²C Data I/O | Open-drain bidirectional bus line; supports readback of RDAC register; requires external pull-up to VL. |
| AD0/AD1 | Address Inputs | Set slave address (0x54–0x57); enable up to four AD5280BRUZ20 devices on same I²C bus without conflict. |
| GND | Ground Reference | Analog/digital common return; must be low-impedance; separate from power ground if noise-sensitive layout required. |
| VSS | Negative Supply | Required for dual-supply operation (−4.5 V to −5.5 V); enables true bipolar signal handling across A/W/B terminals. |
| VL | Logic Supply Reference | Defines logic threshold (0.3×VL / 0.7×VL); must match host MCU I/O voltage and be ≤ VDD. |
| O1/O2 | Programmable Logic Outputs | CMOS-compatible outputs driven by internal register bits; usable for LED control, analog switch gating, or status signaling. |
Key Features
| Feature | Design Value |
|---|---|
| Midscale Power-On Preset | Automatically initializes wiper to code 0x80 at power-up-eliminates startup glitches and simplifies fault recovery without external memory. |
| Programmable Reset | Allows user-defined power-up wiper position via SHDN pin sequencing-replaces costly external EEPROM in embedded calibration systems. |
| Bipolar Operation Support | Full analog terminal swing from VSS to VDD enables AC-coupled and dual-supply signal conditioning (e.g., ±5 V audio paths). |
| Channel Matching | 1% A–B resistance matching between channels (AD5282) and within lot-critical for differential gain/offset trimming and matched filter design. |
| Low Temperature Drift (Divider Mode) | 5 ppm/°C voltage-divider tempco-achieved via resistor ratio stability-ensures <±0.05% output voltage drift over full temperature range. |
Applications
| Audio Volume Control | Instrumentation Gain Calibration |
|---|---|
|
Use Scenario: Replacing mechanical potentiometers in professional audio mixers for channel-level attenuation with remote digital control. IC Role / Device Role / Timing Role: Acts as digitally addressed voltage divider between line-in and op-amp input; wiper provides attenuated signal to amplifier stage. Use Value: Eliminates mechanical wear and contact noise; enables recallable presets and firmware-controlled loudness compensation across 256 discrete steps. |
Use Scenario: Calibrating gain in high-precision data acquisition front-ends where sensor output must be scaled before ADC sampling. IC Role / Device Role / Timing Role: Configured as a precision programmable resistor in non-inverting op-amp feedback loop to set exact gain ratio (e.g., ×1 to ×100). Use Value: Achieves <±0.1% gain accuracy over temperature using 20 kΩ RAB and 5 ppm/°C divider tempco-reducing need for manual trim or factory recalibration. |
| Programmable Voltage Source | Line Impedance Matching |
|
Use Scenario: Generating stable, software-adjustable bias voltages for sensor excitation (e.g., RTD, bridge transducers) in industrial process controllers. IC Role / Device Role / Timing Role: Used in potentiometer mode with A = VREF, B = GND, and W feeding buffer amplifier to deliver 0–VREF × (D/256) output. Use Value: Delivers 8-bit resolution (3.9 mV/step at 1 VREF) with <±1 LSB INL-enabling precise, repeatable excitation voltage setting without DAC peripheral. |
Use Scenario: Dynamically adjusting termination resistance in high-speed communication lines (e.g., RS-485, LVDS) to compensate for PCB trace variations or cable length changes. IC Role / Device Role / Timing Role: Configured as rheostat (W–B) in series with transmission line; resistance adjusted to match characteristic impedance (e.g., 120 Ω). Use Value: Maintains signal integrity under varying environmental conditions using 30 ppm/°C tempco and 256-step granularity-reducing EMI and reflection-induced jitter. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digital potentiometer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD5282BRUZ20 | Dual-channel version with identical 20 kΩ RAB, same I²C interface, and shared SHDN/VL-but occupies 16-lead TSSOP and adds second RDAC channel. | Required when simultaneous independent adjustment of two signal paths (e.g., stereo audio, differential gain) is needed. | Select AD5282BRUZ20 only if dual-channel functionality justifies extra pin count and board area; otherwise AD5280BRUZ20 offers lower cost and simpler routing. |
| MCP41010-I/P | Single-channel, SPI interface, 10 kΩ RAB, 10-bit resolution (1024 steps), no logic outputs, wider tempco (150 ppm/°C), DIP-8 package. | Suitable for cost-sensitive, low-density PCBs where SPI is preferred and higher resolution outweighs tempco and feature trade-offs. | Choose MCP41010-I/P for legacy SPI-based systems or space-constrained through-hole designs-but verify 150 ppm/°C drift meets system stability requirements. |
Compared with AD5282BRUZ20, AD5280BRUZ20 saves board space and reduces interconnect complexity for single-path applications; versus MCP41010-I/P, it delivers superior temperature stability and integrated logic outputs at the cost of SPI compatibility and higher resolution.
Availability
AD5280BRUZ20 is available at Aetrix Electronics and suitable for audio volume control, instrumentation gain calibration, programmable voltage sources, and line impedance matching requiring stable component supply across industrial temperature ranges and long production lifecycles.
Supply support for AD5280BRUZ20 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 Norwood, MA, with design centers worldwide and a focus on precision, reliability, and signal integrity.
The AD5280/AD5282 product line was engineered for high-accuracy, low-drift digital resistance control in instrumentation, audio, and communications-emphasizing rail-to-rail analog operation, I²C simplicity, and robustness across extended industrial temperatures.
FAQ
What is the maximum operating voltage for AD5280BRUZ20?
The AD5280BRUZ20 supports a single-supply range of +4.5 V to +16.5 V (VDD to GND) and dual-supply operation from ±4.5 V to ±5.5 V (VDD to VSS), with absolute maximum ratings of −0.3 V to +16.5 V on VDD and 0 V to −7 V on VSS. Exceeding these violates Absolute Maximum Ratings and risks permanent damage.
Does AD5280BRUZ20 require an external EEPROM to retain wiper position after power cycle?
No. AD5280BRUZ20 features a programmable power-on preset function controlled via the SHDN pin, allowing user-defined wiper initialization without external nonvolatile memory. Its midscale default (code 0x80) activates automatically if SHDN is tied to VL, eliminating EEPROM dependency.
Can AD5280BRUZ20 operate with bipolar analog signals (e.g., ±2.5 V) while powered from a single +5 V supply?
No. Bipolar analog signal operation across A/W/B terminals requires dual supplies (e.g., VDD = +5 V, VSS = −5 V) to establish symmetric voltage rails. With only +5 V and GND, the analog terminals are constrained to 0 V to +5 V; applying negative voltage violates Absolute Maximum Ratings.
What is the guaranteed linearity performance of AD5280BRUZ20 in potentiometer mode?
In potentiometer mode, AD5280BRUZ20 guarantees ±1 LSB integral nonlinearity (INL) and ±1 LSB differential nonlinearity (DNL) over temperature (−40°C to +85°C), ensuring monotonic behavior and predictable voltage division accuracy-critical for closed-loop calibration and precision DAC replacement.
How many AD5280BRUZ20 devices can share the same I²C bus?
Up to four AD5280BRUZ20 devices can coexist on one I²C bus using the AD0 and AD1 address pins, which configure slave addresses 0x54–0x57. Each device must have unique AD0/AD1 combinations; no external address translators or bus buffers are required for basic multi-drop operation.
AD5280BRUZ20 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 14-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Programmable:
- Not Verified
- Taper:
- Linear
- Configuration:
- Potentiometer
- Number of Circuits:
- 1
- Number of Taps:
- 256
- Resistance (Ohms):
- 20k
- Interface:
- I2C
- Memory Type:
- Volatile
- Voltage - Supply:
- 4.5V ~ 16.5V, ±5V
- Features:
- Selectable Address
- Tolerance:
- ±30%
- Temperature Coefficient (Typ):
- 30ppm/°C
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 14-TSSOP
- Operating Temperature:
- -40°C ~ 85°C
- Resistance - Wiper (Ohms) (Typ):
- 60
AD5280BRUZ20 FAQ
1.How can I place an order for AD5280BRUZ20 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD5280BRUZ20 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 AD5280BRUZ20 reliable?
The price and inventory of AD5280BRUZ20 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD5280BRUZ20 is usually 5 days.
3.What payment methods are accepted for AD5280BRUZ20?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD5280BRUZ20 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD5280BRUZ20?
AD5280BRUZ20 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD5280BRUZ20 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 AD5280BRUZ20?
For technical support, including AD5280BRUZ20 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD5280BRUZ20 requirements.
6.How does Aetrix verify that AD5280BRUZ20 is sourced from the original manufacturer or authorized distributors?
All AD5280BRUZ20 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 AD5280BRUZ20 meets industry standards.
7.What is the process for return or replacement of AD5280BRUZ20?
All AD5280BRUZ20 units undergo pre-shipment inspection (PSI). If there is an issue with AD5280BRUZ20, 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 AD5280BRUZ20 part is unused and in its original packaging.
Return procedure for AD5280BRUZ20:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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