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Analog Devices Inc. AD5242BRU1M-REEL7
- Part No.:
- AD5242BRU1M-REEL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Digital Potentiometers
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
AD5242BRU1M-REEL7.pdf
- Description:
- IC DGTL POT 1MOHM 256TAP 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,318
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Product details
Overview
AD5242BRU1M-REEL7 from Analog Devices is a dual-channel, I²C-compatible 256-position digital potentiometer with 1 MΩ end-to-end resistance, 30 ppm/°C temperature coefficient, and operation from 2.7 V to 5.5 V single supply or ±2.7 V dual supply. It replaces mechanical potentiometers in precision gain/offset adjustment circuits, audio volume control, and programmable voltage-to-current conversion.
For engineers reviewing the AD5242BRU1M-REEL7 datasheet, AD5242BRU1M-REEL7 pinout, AD5242BRU1M-REEL7 application, or AD5242BRU1M-REEL7 equivalent, key selection criteria include dual-channel matching (±1% RAB), integrated programmable logic outputs (O1/O2), shutdown functionality, I²C readback capability, and guaranteed operation from −40°C to +105°C.
Technical Context
The AD5242BRU1M-REEL7 implements two independent 8-bit digitally controlled resistor arrays (RDAC1/RDAC2) with wiper positions selectable via I²C interface. Each channel supports both rheostat (A–W or B–W) and potentiometer divider (A–W–B) configurations, with midscale power-on default and nonvolatile wiper position retention during shutdown.
Its dual-supply capability (±2.7 V) enables bipolar ac signal conditioning, while the 1 MΩ nominal resistance yields 6 kHz −3 dB bandwidth and 14 nV/√Hz wiper noise at 1 kHz. The device integrates two programmable logic outputs (O1/O2) with push-pull drive strength (1.6 mA sink / 40 µA source) and independent control via I²C instruction byte.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 8-bit (256 discrete wiper positions per channel) |
| Nominal Resistance | 1 MΩ ±50% at 25°C - sets full-scale range for gain/attenuation and defines bandwidth (6 kHz) and thermal noise floor |
| Tempco | 30 ppm/°C - ensures stable resistance over −40°C to +105°C without external calibration |
| Supply Range | Single: 2.7 V to 5.5 V; Dual: ±2.7 V - supports mixed-signal systems and bipolar analog signal paths |
| I²C Interface | 400 kHz max clock, readback enabled - allows real-time wiper position verification and multi-device bus addressing (AD0/AD1) |
| Wiper Resistance | 60 Ω to 120 Ω - contributes fixed offset in low-code settings; limits minimum achievable resistance in rheostat mode |
| Voltage Divider Tempco | 5 ppm/°C - enables high-accuracy ratiometric output (e.g., sensor excitation, reference division) insensitive to ambient drift |
Pinout & Package
AD5242BRU1M-REEL7 is housed in a 16-lead TSSOP package (4.4 mm × 5.0 mm, 0.65 mm pitch), optimized for space-constrained industrial and audio applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 16 | A1, A2 | Fixed end of Channel 1/2 resistor ladder - connects to high-side voltage or signal source in potentiometer/rheostat mode |
| 2, 15 | W1, W2 | Digitally positioned wiper - delivers programmable voltage division or variable resistance; includes 60–120 Ω switch resistance |
| 4, 14 | B1, B2 | Fixed end of Channel 1/2 resistor ladder - ties to ground, reference, or low-side node; shorted to W during SHDN |
| 5 | VDD | Positive supply input - powers internal logic, I²C interface, and RDAC array; accepts 2.7–5.5 V |
| 6 | SHDN | Active-low hardware shutdown - disconnects A terminals and shorts W to B, reducing current to ≤1 µA while preserving register state |
| 7 | SCL | I²C clock input - synchronizes serial data transfer; compatible with standard 400 kHz Fast Mode |
| 8 | SDA | I²C bidirectional data line - supports readback of RDAC register contents and write of wiper/O1/O2 states |
| 9, 10 | AD0, AD1 | Hardware address bits - configure one of four unique I²C addresses (0x2C–0x2F) for multi-device bus operation |
| 11 | DGND | Digital ground reference - separates logic return from analog/supply paths to minimize noise coupling |
| 12 | VSS | Negative supply rail - enables true bipolar operation when used with ±2.7 V supplies |
| 13 | O2 | Programmable logic output - independently controllable via I²C; drives LEDs, analog switches, or logic gates with 1.6 mA sink capability |
| 14 | O1 | Programmable logic output - identical function to O2; allows synchronized system-level control without additional GPIO |
Key Features
| Feature | Design Value |
|---|---|
| Dual-channel 1 MΩ matching | ±1% channel-to-channel RAB tolerance - enables precise differential gain control and matched filter tuning |
| I²C readback capability | Verifies programmed wiper position in real time - critical for safety-critical or closed-loop calibration systems |
| Integrated logic outputs O1/O2 | Push-pull outputs with VDD/VSS rail-to-rail swing - eliminates need for external drivers in LED biasing or analog switch control |
| Hardware + software shutdown | SHDN pin and SD bit provide redundant low-power modes - reduces system standby current to sub-µA while retaining wiper state |
| Midscale power-on reset | Wipers initialize to code 0x80 at power-up - prevents undefined output transients in gain-setting or bias networks |
| Extended temperature range | −40°C to +105°C operation - qualified for industrial motor drives, automotive infotainment, and outdoor instrumentation |
Applications
| Audio Volume Control | Instrumentation Gain Adjustment |
|---|---|
Use Scenario: Programmable attenuation in stereo line-level audio paths with mute and balance functions. IC Role / Device Role / Timing Role: Dual-channel digital potentiometer implementing ratiometric voltage division between left/right channels; O1/O2 control mute relays. Use Value: Eliminates mechanical wear and channel imbalance; 1 MΩ value minimizes capacitive loading on op-amp feedback paths while enabling 0.4% step resolution. |
Use Scenario: Precision gain setting in programmable-gain instrumentation amplifiers for sensor signal conditioning. IC Role / Device Role / Timing Role: Two matched 1 MΩ RDACs configure noninverting amplifier feedback and reference scaling networks. Use Value: ±1% channel matching ensures <0.02 dB gain error between differential paths; 5 ppm/°C divider tempco maintains accuracy across industrial temperature ranges. |
| Programmable Voltage-to-Current Conversion | Line Impedance Matching |
Use Scenario: Configurable current source for LED driver bias or 4–20 mA transmitter calibration. IC Role / Device Role / Timing Role: Rheostat-mode RDAC sets feedback resistance in op-amp-based Howland current source topology. Use Value: 1 MΩ range supports microamp-level currents (e.g., 5 µA at 5 V); 30 ppm/°C tempco ensures stable output over ambient shifts. |
Use Scenario: Adaptive termination in high-speed communication interfaces (e.g., RS-485, CAN FD stubs) requiring dynamic impedance tuning. IC Role / Device Role / Timing Role: Dual RDACs adjust series/shunt termination values to compensate for PCB trace variations and connector aging. Use Value: 256-step resolution enables fine-grained 50–120 Ω matching; I²C readback confirms actual termination value post-configuration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digital potentiometer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD5242BRU100-REEL7 | 100 kΩ nominal resistance, same 16-TSSOP package and pinout | Higher bandwidth (69 kHz vs. 6 kHz) and lower thermal noise (14 nV/√Hz unchanged), but reduced max voltage handling | Select for higher-frequency AC signal paths where 100 kΩ provides optimal SNR and settling time |
| AD5242BRU10-REEL7 | 10 kΩ nominal resistance, same 16-TSSOP package and pinout | 650 kHz bandwidth and lower wiper resistance (60–120 Ω dominates less), but higher power dissipation at full scale | Select for fast-settling DC-coupled gain stages or low-voltage (<2.7 V) systems requiring minimal on-resistance impact |
Compared with AD5242BRU100-REEL7 and AD5242BRU10-REEL7, the AD5242BRU1M-REEL7 trades bandwidth and power efficiency for higher impedance interface capability, making it optimal for high-Z sensor biasing, low-current sources, and noise-sensitive audio applications where 1 MΩ minimizes loading effects.
Availability
AD5242BRU1M-REEL7 is available at Aetrix Electronics and suitable for industrial instrumentation, audio subsystems, and programmable power supply calibration requiring stable component supply, long-term lifecycle support, and guaranteed extended-temperature performance.
Supply support for AD5242BRU1M-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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The AD5242 is part of Analog Devices' precision digital potentiometer product line, designed specifically for replacing mechanical trimmers in automated calibration, programmable gain/offset control, and embedded system tuning applications where reliability and temperature stability are critical.
FAQ
What is the maximum operating temperature range for the AD5242BRU1M-REEL7?
The AD5242BRU1M-REEL7 is fully specified and guaranteed to operate from −40°C to +105°C. This extended temperature range is validated across all electrical parameters including resistance tolerance, tempco, I²C timing, and wiper settling time, making it suitable for under-hood automotive modules and industrial motor control enclosures where ambient temperatures exceed 85°C.
Does the AD5242BRU1M-REEL7 support I²C readback of wiper position?
Yes, the AD5242BRU1M-REEL7 supports full I²C readback of both RDAC1 and RDAC2 wiper register contents. After selecting a channel via the A/B bit in the instruction byte, a read transaction returns the current 8-bit wiper code. This feature enables closed-loop calibration, fault detection, and configuration verification without requiring external ADC monitoring of the wiper voltage.
How does the shutdown function work on the AD5242BRU1M-REEL7?
The AD5242BRU1M-REEL7 features dual shutdown control: an active-low SHDN pin and a software-controlled SD bit in the I²C instruction byte. Both disconnect Terminal A and short Wiper W to Terminal B, reducing supply current to ≤1 µA while preserving the RDAC register contents. Upon exit, the stored wiper position is immediately restored - no reprogramming is needed.
Can the AD5242BRU1M-REEL7 be used with a 3.3 V microcontroller I²C bus?
Yes, the AD5242BRU1M-REEL7 supports 3.3 V I²C operation. Its SDA/SCL inputs accept VIH ≥ 2.1 V and VIL ≤ 0.6 V at VDD = 3 V, meeting standard I²C voltage thresholds. Pull-up resistors should reference the microcontroller's 3.3 V rail, and no level-shifting circuitry is required unless interfacing with 5 V controllers or legacy EEPROMs.
What is the purpose of the O1 and O2 pins on the AD5242BRU1M-REEL7?
O1 and O2 are programmable logic outputs controlled via the I²C instruction byte. They provide rail-to-rail (VDD/VSS) push-pull drive with 1.6 mA sink and 40 µA source capability. These outputs can replace external GPIO expanders to control LEDs, analog switches, or logic gates - for example, using O1 to enable a mute FET while O2 toggles channel select in a dual-path audio processor.
AD5242BRU1M-REEL7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Taper:
- Linear
- Configuration:
- Potentiometer
- Number of Circuits:
- 2
- Number of Taps:
- 256
- Resistance (Ohms):
- 1M
- Interface:
- I2C
- Memory Type:
- Volatile
- Voltage - Supply:
- 2.7V ~ 5.5V, ±2.3V ~ 2.7V
- Features:
- Selectable Address
- Tolerance:
- -30%, +50%
- Temperature Coefficient (Typ):
- 30ppm/°C
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 16-TSSOP
- Operating Temperature:
- -40°C ~ 105°C
- Resistance - Wiper (Ohms) (Typ):
- 60
AD5242BRU1M-REEL7 FAQ
1.How can I place an order for AD5242BRU1M-REEL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD5242BRU1M-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 AD5242BRU1M-REEL7 reliable?
The price and inventory of AD5242BRU1M-REEL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD5242BRU1M-REEL7 is usually 5 days.
3.What payment methods are accepted for AD5242BRU1M-REEL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD5242BRU1M-REEL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD5242BRU1M-REEL7?
AD5242BRU1M-REEL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD5242BRU1M-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 AD5242BRU1M-REEL7?
For technical support, including AD5242BRU1M-REEL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD5242BRU1M-REEL7 requirements.
6.How does Aetrix verify that AD5242BRU1M-REEL7 is sourced from the original manufacturer or authorized distributors?
All AD5242BRU1M-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 AD5242BRU1M-REEL7 meets industry standards.
7.What is the process for return or replacement of AD5242BRU1M-REEL7?
All AD5242BRU1M-REEL7 units undergo pre-shipment inspection (PSI). If there is an issue with AD5242BRU1M-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 AD5242BRU1M-REEL7 part is unused and in its original packaging.
Return procedure for AD5242BRU1M-REEL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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