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Analog Devices Inc. AD5245BRJZ5-R2
- Part No.:
- AD5245BRJZ5-R2
- Manufacturer:
- Analog Devices Inc.
- Category:
- Digital Potentiometers
- Package:
- SOT-23-8
- Datasheet:
-
AD5245BRJZ5-R2.pdf
- Description:
- IC DGTL POT 5KOHM 256TAP SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:916
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Product details
Overview
AD5245BRJZ5-R2 from Analog Devices is a 256-position I²C-compatible digital potentiometer in SOT-23-8 package with 5 kΩ end-to-end resistance, ±0.1 LSB typical differential nonlinearity, 45 ppm/°C resistance temperature coefficient, and 2.7 V to 5.5 V single-supply operation - used for precision LCD VCOM adjustment and sensor transducer calibration.
For engineers reviewing the AD5245BRJZ5-R2 datasheet, AD5245BRJZ5-R2 pinout, AD5245BRJZ5-R2 application, or AD5245BRJZ5-R2 equivalent, key selection criteria include I²C address flexibility (AD0 pin), midscale power-on default, shutdown mode (<1 µA), and guaranteed monotonicity across –40°C to +125°C industrial temperature range.
Technical Context
The AD5245BRJZ5-R2 implements a thin-film resistor ladder with CMOS switch matrix controlled via standard-mode I²C interface (400 kHz max), supporting both rheostat (A–W or B–W) and potentiometer divider (A–W–B) configurations. Its internal power-on circuit presets the wiper to code 0x80 (midscale), eliminating startup uncertainty.
It features dual operating modes: in rheostat mode, RWB = (D/256) × RAB + 2 × RW (RAB = 5 kΩ, RW ≤ 120 Ω); in potentiometer mode, output voltage follows VW = (D/256) × VA + ((256−D)/256) × VB, with 15 ppm/°C voltage-divider tempco due to ratio-based operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| End-to-end resistance | 5 kΩ - defines full-scale rheostat range and sets gain/attenuation scale in divider applications |
| Resolution | 256 positions (8-bit) - enables 0.39% step resolution for fine analog tuning |
| Resistance tempco | 45 ppm/°C - ensures stable resistance over –40°C to +125°C without external compensation |
| VDD supply range | 2.7 V to 5.5 V - supports direct interfacing with 3.3 V and 5 V logic systems |
| Supply current | 8 µA typical - enables always-on biasing in battery-powered devices with <2% monthly drain on 450 mAh Li-ion |
| I²C clock frequency | 400 kHz - compatible with standard-mode I²C controllers without timing redesign |
| Wiper resistance | ≤120 Ω - limits minimum achievable resistance and contributes predictable offset in low-value rheostat settings |
Pinout & Package
AD5245BRJZ5-R2 is housed in a compact 2.9 mm × 3 mm SOT-23-8 package with gull-wing leads, optimized for space-constrained PCB layouts and reflow soldering.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (W) | Wiper terminal | Output node for rheostat or divider mode; voltage range bounded by GND and VDD; carries full signal current in rheostat use |
| 2 (VDD) | Positive supply | Power rail for internal logic and switch bias; must be powered before applying voltages to A/B/W to prevent ESD diode conduction |
| 3 (GND) | Digital ground | Reference for I²C signals and internal logic; should be joined to analog ground at single point to minimize ground bounce |
| 4 (SCL) | I²C clock input | Positive-edge-triggered serial clock; requires external pull-up resistor; defines timing for register access and command execution |
| 5 (SDA) | I²C data I/O | Open-drain bidirectional bus line; requires external pull-up; carries address, instruction, and wiper register data |
| 6 (AD0) | Address decode bit | Configures LSB of 7-bit slave address; enables two AD5245BRJZ5-R2 devices on same I²C bus without conflict |
| 7 (B) | Resistor terminal B | Low-side terminal in rheostat (W–B) or divider (A–W–B); floating allowed in rheostat mode when A is open |
| 8 (A) | Resistor terminal A | High-side terminal in rheostat (A–W) or divider (A–W–B); open-circuit in shutdown mode to isolate load |
Key Features
| Feature | Design Value |
|---|---|
| Midscale power-on preset | Wiper defaults to code 0x80 at power-up - eliminates undefined startup state and simplifies fault recovery in embedded systems |
| Shutdown mode | SD bit disconnects Terminal A and shorts W to B - reduces supply current to <1 µA while preserving register contents for instant restore |
| Two-device I²C addressing | AD0 pin selects between addresses 0x2C and 0x2D - allows dual-channel adjustment on shared bus without address conflict |
| Monotonic operation | Guaranteed ±1 LSB DNL across all codes - ensures no step reversals during wiper sweeps, critical for closed-loop control stability |
| Low-voltage compatibility | VIH = 2.1 V min at VDD = 3 V - enables direct connection to 3.3 V microcontrollers without level-shifting circuitry |
Applications
| LCD Panel VCOM Adjustment | Sensor Transducer Calibration |
|---|---|
|
Use Scenario: Fine-tuning common-mode voltage in TFT-LCD source driver circuits to minimize image flicker and improve grayscale uniformity. IC Role / Device Role / Timing Role: Digitally programmable DC bias element in high-impedance VCOM feedback path; updated infrequently via I²C during panel initialization or factory trim. Use Value: Replaces mechanical trimpots with 0.39% step resolution and 45 ppm/°C stability - eliminates manual calibration labor and drift-induced field failures. |
Use Scenario: Calibrating zero-offset and span of analog outputs from pressure, temperature, or optical sensors in automotive and industrial modules. IC Role / Device Role / Timing Role: Precision rheostat in op-amp feedback loop or potentiometer in sensor bridge excitation path; adjusted once per unit during production test. Use Value: Provides monotonic, temperature-stable resistance trimming (±0.1 LSB DNL, 45 ppm/°C) - ensures sensor accuracy meets AEC-Q200 or IEC 61000-4-2 requirements. |
| RF Amplifier Bias Control | Gain/Offset Trim in Signal Chains |
|
Use Scenario: Setting quiescent current in GaAs FET or LDMOS RF power amplifier stages to optimize linearity and efficiency across temperature. IC Role / Device Role / Timing Role: Low-noise rheostat (A–W) in gate bias network; configured at power-up and held static during RF operation. Use Value: Delivers 6 nV/√Hz noise density and 1.2 MHz bandwidth at 5 kΩ - preserves RF dynamic range while enabling factory or field recalibration. |
Use Scenario: Adjusting gain and DC offset in instrumentation amplifiers, ADC drivers, or DAC output buffers for medical, test, and measurement equipment. IC Role / Device Role / Timing Role: Dual-role device: potentiometer for gain-setting resistive dividers and rheostat for offset nulling loops. Use Value: Supports both configurations with 15 ppm/°C voltage-divider tempco - maintains system accuracy over extended thermal cycles without recalibration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digital potentiometer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX5487ETE+T | 256-tap, 10 kΩ, SPI interface, 2.7–5.5 V, 10 ppm/°C tempco | Requires SPI controller instead of I²C; lower tempco but higher cost and larger TDFN-8 package | Select when SPI is already used in system and ultra-low tempco is prioritized over bus compatibility |
| MCP41HV51-502E/SN | 256-tap, 5 kΩ, SPI interface, 4.5–18 V supply, 100 ppm/°C tempco | Supports high-voltage operation up to 18 V but exhibits higher resistance drift; no AD0 pin for multi-device addressing | Choose for high-side biasing above 5.5 V where AD5245BRJZ5-R2's 5.5 V limit is insufficient |
Compared with MAX5487ETE+T and MCP41HV51-502E/SN, AD5245BRJZ5-R2 offers I²C compatibility with AD0 addressing, lowest power (8 µA), and optimal 45 ppm/°C tempco for 5 V systems - making it preferred for space- and power-sensitive industrial and automotive trim applications.
Availability
AD5245BRJZ5-R2 is available at Aetrix Electronics and suitable for LCD panel VCOM adjustment, sensor transducer calibration, and RF amplifier biasing requiring stable component supply, long-term traceability, and industrial temperature support.
Supply support for AD5245BRJZ5-R2 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 AD5245 product line delivers compact, low-power digital potentiometers for precision analog trimming in space-constrained, battery-operated, and high-reliability systems - targeting factory calibration, display tuning, and sensor conditioning.
FAQ
What is the end-to-end resistance value of the AD5245BRJZ5-R2?
The AD5245BRJZ5-R2 has a nominal end-to-end resistance (RAB) of 5 kΩ, confirmed in Table 1 of the Rev. C datasheet under "5 kΩ Version" electrical characteristics. This value defines the maximum rheostat resistance and scaling factor in potentiometer divider mode. Tolerance is ±30% at 25°C, and temperature coefficient is 45 ppm/°C.
Does the AD5245BRJZ5-R2 retain its wiper setting after power cycling?
No, the AD5245BRJZ5-R2 is volatile: wiper position resets to midscale (code 0x80) on each power-up. It lacks EEPROM or nonvolatile memory. For persistent settings, external microcontroller storage or constant biasing (per Figure 42) is required - though the latter consumes ~1.3 µA continuously from the host supply.
Can multiple AD5245BRJZ5-R2 devices share the same I²C bus?
Yes - the AD5245BRJZ5-R2 includes the AD0 pin to select between two I²C slave addresses (0x2C and 0x2D), allowing up to two devices on one bus. This is explicitly documented in the "I²C-Compatible 2-Wire Serial Bus" section and Table 10 of the datasheet, enabling dual-channel trimming without address collision.
What is the maximum allowable voltage across terminals A, B, and W of the AD5245BRJZ5-R2?
Per Table 4 (Absolute Maximum Ratings), VA, VB, and VW must remain within GND to VDD. Exceeding this range forward-biases internal ESD protection diodes, risking unintended VDD powering or latch-up. The device does not support rail-to-rail analog signal swing beyond its supply rails - unlike some high-voltage digital pots.
How does shutdown mode affect the AD5245BRJZ5-R2's terminal connections?
In shutdown mode (SD bit = 1), the AD5245BRJZ5-R2 opens Terminal A and shorts W to B, yielding near-zero resistance in rheostat mode or 0 V output in divider mode. Crucially, the wiper register content is preserved - exiting shutdown restores the prior setting instantly. Shutdown current is ≤1 µA at VDD = 5.5 V (Table 1).
AD5245BRJZ5-R2 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- SOT-23-8
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Taper:
- Linear
- Configuration:
- Potentiometer
- Number of Circuits:
- 1
- Number of Taps:
- 256
- Resistance (Ohms):
- 5k
- Interface:
- I2C
- Memory Type:
- Volatile
- Voltage - Supply:
- 2.7V ~ 5.5V
- Features:
- Selectable Address
- Tolerance:
- ±30%
- Temperature Coefficient (Typ):
- 45ppm/°C
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- SOT-23-8
- Operating Temperature:
- -40°C ~ 125°C
- Resistance - Wiper (Ohms) (Typ):
- 50
AD5245BRJZ5-R2 FAQ
1.How can I place an order for AD5245BRJZ5-R2 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD5245BRJZ5-R2 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 AD5245BRJZ5-R2 reliable?
The price and inventory of AD5245BRJZ5-R2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD5245BRJZ5-R2 is usually 5 days.
3.What payment methods are accepted for AD5245BRJZ5-R2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD5245BRJZ5-R2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD5245BRJZ5-R2?
AD5245BRJZ5-R2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD5245BRJZ5-R2 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 AD5245BRJZ5-R2?
For technical support, including AD5245BRJZ5-R2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD5245BRJZ5-R2 requirements.
6.How does Aetrix verify that AD5245BRJZ5-R2 is sourced from the original manufacturer or authorized distributors?
All AD5245BRJZ5-R2 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 AD5245BRJZ5-R2 meets industry standards.
7.What is the process for return or replacement of AD5245BRJZ5-R2?
All AD5245BRJZ5-R2 units undergo pre-shipment inspection (PSI). If there is an issue with AD5245BRJZ5-R2, 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 AD5245BRJZ5-R2 part is unused and in its original packaging.
Return procedure for AD5245BRJZ5-R2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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