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Analog Devices Inc. AD5280BRUZ20-REEL7
- Part No.:
- AD5280BRUZ20-REEL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Digital Potentiometers
- Package:
- 14-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
AD5280BRUZ20-REEL7.pdf
- Description:
- IC DGT POT 20KOHM 256TAP 14TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,114
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Product details
Overview
AD5280BRUZ20-REEL7 from Analog Devices is a single-channel, 256-position, I²C-compatible digital potentiometer with 20 kΩ end-to-end resistance, ±5 V or +15 V supply operation, and 30 ppm/°C temperature coefficient-used for precision gain/offset adjustment in audio/video signal chains and programmable voltage sources.
For engineers reviewing the AD5280BRUZ20-REEL7 datasheet, AD5280BRUZ20-REEL7 pinout, AD5280BRUZ20-REEL7 application, or AD5280BRUZ20-REEL7 equivalent, key selection criteria include its midscale power-on preset, dual-supply compatibility, wiper resistance (60–150 Ω), I²C timing compliance (400 kHz), and TSSOP-14 surface-mount package.
Technical Context
The AD5280BRUZ20-REEL7 implements an 8-bit RDAC architecture with resistor ladder topology, supporting both rheostat (W–B or W–A) and potentiometer (A–W–B) configurations. Its internal register retains wiper position during operation and supports programmable reset via SHDN pin.
It features two logic outputs (O1, O2) driven by internal registers, enabling direct interface to LEDs, analog switches, or logic gates without external drivers. The device operates across −40°C to +85°C and supports level-shifted I²C communication for mixed-voltage systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 8-bit (256 positions): enables 0.39% step resolution over full scale for fine analog tuning. |
| Terminal Resistance | 20 kΩ ±30%: fixed A–B resistance optimized for low-noise, moderate-bandwidth applications (BW = 310 kHz). |
| Tempco | 30 ppm/°C: ensures stable resistance over industrial temperature range, critical for calibration-critical instrumentation. |
| Supply Range | +4.5 V to +16.5 V single or ±4.5 V to ±5.5 V dual: supports legacy 5 V, modern 15 V rails, and bipolar signal conditioning. |
| I²C Speed | 400 kHz standard mode: compatible with most microcontrollers without clock stretching or custom firmware. |
| Wiper Resistance | 60–150 Ω: limits minimum achievable resistance and must be accounted for in precision current-source designs. |
| Power-On State | Midscale (0x80): eliminates startup transients in gain-control loops without external EEPROM or initialization code. |
Pinout & Package
AD5280BRUZ20-REEL7 is housed in a 14-lead thin shrink small-outline package (TSSOP-14) with 0.65 mm pitch, optimized for high-density PCB layouts and reflow soldering (JEDEC J-STD-020 compliant).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A | Resistor Terminal A | High-side terminal of 20 kΩ resistor ladder; connects to reference voltage or signal source in potentiometer mode. |
| W | Wiper Terminal | Digitally selectable tap point; output node for variable resistance or voltage divider; includes 60–150 Ω switch resistance. |
| B | Resistor Terminal B | Low-side terminal; tied to GND or negative rail in bipolar operation; default connection point during SHDN assertion. |
| VDD | Positive Supply | Accepts +4.5 V to +16.5 V; powers analog core and internal logic; must be ≥ |VSS| for valid operation. |
| SHDN | Active-Low Shutdown | Asynchronously shorts W to B and opens A; retains RDAC register; doubles as programmable power-up preset control. |
| SCL | I²C Clock Input | CMOS-level input synchronized to internal state machine; supports 400 kHz max frequency per I²C spec. |
| SDA | I²C Data I/O | Open-drain bidirectional line; requires external pull-up; handles address, instruction, and data bytes per Figure 45. |
| AD0, AD1 | I²C Address Bits | Set slave address (0x54–0x57); allow up to four AD5280 devices on same bus without arbitration conflict. |
| GND | Ground Reference | Analog and digital common return; must be low-impedance to minimize noise coupling into wiper path. |
| VSS | Negative Supply | Required for dual-supply operation (±4.5 V to ±5.5 V); enables true bipolar signal handling at terminals A/W/B. |
| VL | Logic Supply | Defines logic threshold (0.3×VL to 0.7×VL); must match host MCU voltage (2.7 V to VDD) for reliable I²C communication. |
| O1, O2 | Programmable Logic Outputs | CMOS outputs driven by internal registers; sink/source up to ±5 mA; usable for status indication or peripheral control. |
Key Features
| Feature | Design Value |
|---|---|
| Midscale Power-On Preset | Wiper defaults to 0x80 at power-up-eliminates need for boot-time I²C initialization in safety-critical or fast-start systems. |
| Programmable Reset via SHDN | SHDN pin serves dual role: hardware shutdown and nonvolatile preset configuration-replaces external EEPROM in cost-sensitive designs. |
| Dual-Supply Operation | Supports ±4.5 V to ±5.5 V rails-enables true AC-coupled or bipolar DC signal adjustment without level-shifting circuitry. |
| Two Programmable Logic Outputs | O1/O2 pins reduce BOM count by driving LEDs, analog switches, or logic gates directly-no external buffer required. |
| Channel-to-Channel Matching | ±1% RAB tolerance between channels (AD5282 only)-critical for matched gain/phase in differential or dual-path circuits. |
Applications
| Audio Gain Control | Instrumentation Offset Calibration |
|---|---|
Use Scenario: Adjusting volume or channel balance in professional audio mixers with microcontroller-based UI. IC Role / Device Role / Timing Role: Digitally controlled rheostat replacing mechanical potentiometers; wiper resistance (60–150 Ω) sets minimum attenuation floor. Use Value: Eliminates mechanical wear and drift; 30 ppm/°C tempco maintains consistent gain across operating temperature range. | Use Scenario: Compensating sensor offset in industrial pressure transmitters using microcontroller-driven calibration routines. IC Role / Device Role / Timing Role: Precision potentiometer divider generating trim voltage for op-amp input; 8-bit resolution enables 0.39% fine-tuning steps. Use Value: Enables field recalibration without hardware change; midscale power-on state prevents output fault at system startup. |
| Programmable Voltage Source | Line Impedance Matching |
Use Scenario: Generating adjustable bias voltages for RF front-end amplifiers in telecom base stations. IC Role / Device Role / Timing Role: Potentiometer-mode voltage divider referenced to +15 V rail; VL pin tied to 3.3 V MCU logic for I²C compatibility. Use Value: Supports wide supply range (+4.5 V to +16.5 V) and delivers stable output with 5 ppm/°C divider tempco-superior to discrete resistor networks. | Use Scenario: Dynamically matching termination impedance in high-speed serial links (e.g., LVDS, RS-485) during protocol negotiation. IC Role / Device Role / Timing Role: Rheostat-mode variable resistance placed in series with driver output; 20 kΩ nominal value covers common 50–120 Ω target ranges. Use Value: Enables real-time impedance adaptation without relays or FPGA-controlled resistor arrays-reducing latency and component count. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digital potentiometer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD5282BRUZ20-REEL7 | Dual-channel version in TSSOP-16; identical 20 kΩ, 256-step, I²C interface; adds channel-to-channel matching (±1%). | Required when simultaneous independent adjustment of two signal paths (e.g., stereo audio, differential sensors) is needed. | Select AD5282BRUZ20-REEL7 only if dual-channel functionality justifies larger footprint and higher cost. |
| MCP41010-I/P | Single-channel, 10 kΩ, SPI interface, PDIP-8 package; no logic outputs; 100 ppm/°C tempco; 0–5.5 V supply only. | Suitable for low-cost, low-precision, single-supply embedded systems where I²C is unavailable or board space allows through-hole mounting. | Choose MCP41010-I/P only for cost-driven, non-bipolar, SPI-based designs where tempco and supply flexibility are secondary. |
Compared with AD5280BRUZ20-REEL7, the AD5282BRUZ20-REEL7 offers dual-channel integration at the expense of package size and pin count, while the MCP41010-I/P trades I²C compatibility, tempco, and supply range for lower unit cost and simpler interface-making each viable only within narrowly defined system constraints.
Availability
AD5280BRUZ20-REEL7 is available at Aetrix Electronics and suitable for audio signal conditioning, industrial sensor calibration, and programmable power supply trimming requiring stable component supply and guaranteed long-term availability.
Supply support for AD5280BRUZ20-REEL7 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 AD5280/AD5282 product line was designed for precision electronic replacement of mechanical potentiometers in calibration-critical, temperature-stable, and digitally controllable analog signal paths.
FAQ
What is the maximum supply voltage rating for AD5280BRUZ20-REEL7?
The AD5280BRUZ20-REEL7 supports a maximum single-supply voltage of +16.5 V (VDD to GND) and a maximum dual-supply differential of ±5.5 V (VDD to VSS). Absolute maximum ratings specify VDD to GND ≤ +16.5 V and VSS to GND ≥ −7 V. Exceeding these limits risks permanent damage. Operation at +15 V is fully characterized and recommended for high-voltage signal conditioning applications using the AD5280BRUZ20-REEL7.
Does AD5280BRUZ20-REEL7 support true bipolar operation?
Yes, AD5280BRUZ20-REEL7 supports true bipolar operation when powered by dual supplies (e.g., VDD = +5 V, VSS = −5 V). Its A, W, and B terminals tolerate voltages from VSS to VDD, enabling AC-coupled signal adjustment and symmetric positive/negative voltage division. This capability is confirmed in the "Terminal Voltage Operating Range" section and validated in Application Note "Bipolar DC or AC Operation from Dual Supplies" in the AD5280/AD5282 Rev. C datasheet.
How does the power-on midscale preset function in AD5280BRUZ20-REEL7?
The AD5280BRUZ20-REEL7 automatically initializes its wiper to code 0x80 (midscale) at power-on, provided VL is properly biased and SHDN is deasserted. This behavior is implemented in hardware and requires no I²C initialization sequence. It ensures predictable startup in gain-control or bias-generation circuits, preventing transient output faults-a key reliability feature documented in the "Self-Contained Shutdown Function and Programmable Preset" section of the AD5280BRUZ20-REEL7 datasheet.
Can AD5280BRUZ20-REEL7 drive external loads directly via O1/O2 pins?
Yes, the O1 and O2 pins on AD5280BRUZ20-REEL7 are CMOS logic outputs capable of sourcing/sinking up to ±5 mA, allowing direct drive of LEDs, small-signal MOSFET gates, or TTL/CMOS inputs. Their state is controlled by internal registers accessible via I²C. This eliminates need for external buffers in status indication or simple peripheral control-confirmed in the "Additional Programmable Logic Output" subsection and Pin Function Descriptions table of the AD5280BRUZ20-REEL7 datasheet.
What is the typical bandwidth of AD5280BRUZ20-REEL7 in rheostat mode with 20 kΩ resistance?
The typical −3 dB bandwidth of AD5280BRUZ20-REEL7 in rheostat mode with 20 kΩ end-to-end resistance is 310 kHz, measured at code 0x80 with VDD = +5 V and VSS = −5 V. Bandwidth scales inversely with resistance value (150 kHz at 50 kΩ; 35 kHz at 200 kΩ) and is specified under defined test conditions in Table 1 of the AD5280BRUZ20-REEL7 datasheet. This performance supports audio-band and moderate-speed control loop applications.
AD5280BRUZ20-REEL7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 14-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- 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-REEL7 FAQ
1.How can I place an order for AD5280BRUZ20-REEL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD5280BRUZ20-REEL7 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-REEL7 reliable?
The price and inventory of AD5280BRUZ20-REEL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD5280BRUZ20-REEL7 is usually 5 days.
3.What payment methods are accepted for AD5280BRUZ20-REEL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD5280BRUZ20-REEL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD5280BRUZ20-REEL7?
AD5280BRUZ20-REEL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD5280BRUZ20-REEL7 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-REEL7?
For technical support, including AD5280BRUZ20-REEL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD5280BRUZ20-REEL7 requirements.
6.How does Aetrix verify that AD5280BRUZ20-REEL7 is sourced from the original manufacturer or authorized distributors?
All AD5280BRUZ20-REEL7 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-REEL7 meets industry standards.
7.What is the process for return or replacement of AD5280BRUZ20-REEL7?
All AD5280BRUZ20-REEL7 units undergo pre-shipment inspection (PSI). If there is an issue with AD5280BRUZ20-REEL7, 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-REEL7 part is unused and in its original packaging.
Return procedure for AD5280BRUZ20-REEL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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