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Analog Devices Inc. AD5270BRMZ-100-RL7
- Part No.:
- AD5270BRMZ-100-RL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Digital Potentiometers
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
AD5270BRMZ-100-RL7.pdf
- Description:
- IC DGT RHE 100KOHM 1024TP 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,688
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Product details
Overview
AD5270BRMZ-100-RL7 from Analog Devices is a single-channel, 1024-position digital rheostat with 100 kΩ nominal resistance, ±1% end-to-end resistor tolerance error, 50-times programmable (50-TP) nonvolatile wiper memory, and SPI interface - used for precision gain/offset calibration in industrial instrumentation and programmable power supplies.
For engineers reviewing the AD5270BRMZ-100-RL7 datasheet, AD5270BRMZ-100-RL7 pinout, AD5270BRMZ-100-RL7 application, or AD5270BRMZ-100-RL7 equivalent, key selection criteria include guaranteed 1% resistor tolerance in R-Perf mode, 5 ppm/°C tempco in rheostat configuration, 3 mm × 3 mm LFCSP-10 package, and compatibility with bipolar ±2.5 V operation for ac signal conditioning.
Technical Context
The AD5270BRMZ-100-RL7 implements a segmented resistor ladder architecture with digitally controlled CMOS switches, enabling precise wiper positioning across 1024 codes. Its R-Perf mode guarantees ≤±1% end-to-end resistance tolerance over temperature for calibrated open-loop applications.
It features a 16-bit SPI-compatible serial interface (SYNC, SCLK, DIN, SDO) with CPOL = 0/CPHA = 1 timing, 50-TP memory programming via fuse-blow command (350 ms duration), and automatic power-on restore from nonvolatile memory. The EXT_CAP pin requires a 1 µF ≥7 V capacitor to support OTP programming.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 10 bits - supports 1024 discrete wiper positions for fine-grained analog adjustment. |
| Nominal Resistance | 100 kΩ - defines full-scale rheostat range; enables high-impedance biasing and low-current sensing. |
| Resistor Tolerance Error | ±1% - guaranteed in R-Perf mode (codes 0x04B–0x3FF), eliminating need for external trimming in calibration circuits. |
| Tempco (Rheostat) | 5 ppm/°C - ensures stable resistance vs. temperature drift in precision sensor front-ends. |
| Supply Range | 2.7 V to 5.5 V single-supply or ±2.5 V dual-supply - supports both unipolar and ground-referenced bipolar signal paths. |
| Bandwidth (W terminal) | 60 kHz at −3 dB (100 kΩ) - sufficient for DC to audio-frequency gain control without phase distortion. |
| Wiper Resistance | 35 Ω to 70 Ω - low on-resistance minimizes insertion loss and voltage drop in current-sensing paths. |
| 50-TP Memory | 50-programmable cycles - allows field recalibration up to 50 times without hardware replacement. |
Pinout & Package
AD5270BRMZ-100-RL7 is housed in a 3 mm × 3 mm × 0.8 mm, 10-lead thin LFCSP package (exposed pad). Pin assignments are validated per Analog Devices Rev. H datasheet Figure 6 and Table 10.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Positive supply rail | Accepts 2.7–5.5 V single-supply or +2.5 V in dual-supply mode; requires local 0.1 µF + 10 µF decoupling. |
| A | Rheostat terminal A | Fixed end of 100 kΩ resistor ladder; voltage range bounded by VSS ≤ VA ≤ VDD. |
| W | Wiper output | Adjustable tap point; supports bidirectional current flow; max ±2 mA continuous at 100 kΩ. |
| VSS | Negative supply rail | 0 V for single-supply; −2.5 V for dual-supply; must be decoupled; referenced for EXT_CAP. |
| EXT_CAP | OTP programming capacitor node | Connects to 1 µF ≥7 V capacitor to VSS; enables internal fuse programming without external HV supply. |
| GND | Digital logic ground | Reference for SPI signals; separate from power ground in mixed-signal layouts to reduce noise coupling. |
| SDO | Serial data output | Open-drain output requiring external pull-up; supports daisy-chain readback and RDAC/50-TP register reads. |
| DIN | Serial data input | Accepts 16-bit SPI frames (MSB first); latched on SCLK falling edge; compatible with standard microcontroller SPI peripherals. |
| SCLK | Serial clock input | Supports up to 50 MHz clock rate; timing critical for t4 (SYNC setup) and t5/t6 (data setup/hold). |
| SYNC | Frame synchronization | Active-low enable for SPI frame; rising edge commits command after 16 clocks; interruptible before completion. |
Key Features
| Feature | Design Value |
|---|---|
| 1% resistor tolerance in R-Perf mode | Validated across 100 kΩ range and −40°C to +125°C; enables open-loop calibration without iterative measurement. |
| 50-TP nonvolatile memory | Stores final wiper position permanently; powers up to last programmed value; no battery or EEPROM required. |
| SPI interface with readback | Full-duplex 16-bit command structure supports RDAC register read, 50-TP memory read, and control register access. |
| Bipolar ±2.5 V operation | Allows ground-referenced ac signal adjustment (e.g., op-amp offset nulling) without level-shifting circuitry. |
| Low 5 ppm/°C tempco | Stabilizes resistance over industrial temperature range; critical for sensor bridge balancing and reference trimming. |
| 10-bit resolution (1024 steps) | Provides 0.1% step resolution at 100 kΩ; sufficient for <0.5% total system error in 16-bit DAQ front-ends. |
Applications
| Instrumentation Calibration | Programmable Power Supply |
|---|---|
|
Use Scenario: Calibrating offset/gain errors in 24-bit precision ADC front-ends using matched resistor networks. IC Role / Device Role / Timing Role: Digital rheostat replacing mechanical trimmer in reference voltage divider and transimpedance amplifier feedback path. Use Value: ±1% end-to-end tolerance eliminates post-calibration drift; 50-TP memory retains factory calibration across power cycles. |
Use Scenario: Setting output voltage and current limits in isolated DC-DC modules for test equipment. IC Role / Device Role / Timing Role: Programmable feedback resistor in TL431-based shunt regulator loop; adjusted via microcontroller SPI. Use Value: Enables remote reconfiguration without hardware change; 100 kΩ range supports 0.5–30 V output scaling with <0.1% resolution. |
| Op-Amp Gain Control | Sensor Signal Conditioning |
|
Use Scenario: Dynamic gain adjustment in ultrasound receive chains where signal amplitude varies >60 dB. IC Role / Device Role / Timing Role: Variable gain resistor in non-inverting op-amp configuration; updated in real time during acquisition. Use Value: 60 kHz bandwidth preserves pulse fidelity; low wiper resistance (<70 Ω) avoids gain error at high frequencies. |
Use Scenario: Linearizing thermistor or RTD bridge outputs in environmental monitoring nodes. IC Role / Device Role / Timing Role: Precision span/zero adjust element in Wheatstone bridge completion network. Use Value: 5 ppm/°C tempco matches sensor drift; R-Perf mode ensures <1% absolute error across −40°C to +85°C operating range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digital rheostat applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD5272BRMZ-100-RL7 | Same 1024-position, 100 kΩ, ±1% R-Perf spec, but includes additional shutdown mode and enhanced ESD protection (4 kV HBM). | Preferred for battery-powered or portable instrumentation where power gating and robustness are critical. | Select AD5272BRMZ-100-RL7 if system-level shutdown control or higher ESD immunity is required; otherwise AD5270BRMZ-100-RL7 offers identical core performance at lower cost. |
| MCP45HV51-104E/ST | 1024-position, 100 kΩ, but only ±20% initial tolerance; no R-Perf mode; requires external calibration; 5.5 V max supply. | Suitable for cost-sensitive, non-critical biasing where absolute accuracy is secondary to basic programmability. | Choose MCP45HV51-104E/ST only when budget constraints outweigh precision requirements; lacks guaranteed 1% tolerance and 50-TP memory. |
Compared with AD5272BRMZ-100-RL7, AD5270BRMZ-100-RL7 omits shutdown control but maintains identical R-Perf accuracy and OTP reliability; versus MCP45HV51-104E/ST, it delivers factory-trimmed 1% tolerance without calibration overhead or external components.
Availability
AD5270BRMZ-100-RL7 is available at Aetrix Electronics and suitable for industrial instrumentation, programmable power supplies, sensor calibration, and op-amp gain control requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for AD5270BRMZ-100-RL7 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 precision instrumentation, industrial automation, and communications markets.
The AD5270/AD5271 family was designed specifically for high-accuracy, field-programmable resistor replacement in calibration-critical systems - emphasizing guaranteed 1% tolerance, nonvolatile memory, and robust operation from −40°C to +125°C.
FAQ
What is the guaranteed resistor tolerance for AD5270BRMZ-100-RL7 in precision applications?
The AD5270BRMZ-100-RL7 guarantees ±1% end-to-end resistor tolerance error in R-Perf mode (valid for codes 0x04B–0x3FF at |VDD−VSS| ≥ 4.5 V), verified across −40°C to +125°C. This specification eliminates post-manufacturing trimming in open-loop calibration circuits and is distinct from the ±15% normal-mode tolerance. AD5270BRMZ-100-RL7 achieves this via on-chip laser-trimmed resistor arrays and factory calibration stored in 50-TP memory.
How does the 50-TP memory function in AD5270BRMZ-100-RL7, and what is its programming lifetime?
The AD5270BRMZ-100-RL7 incorporates 50-times programmable (50-TP) nonvolatile memory that permanently stores the wiper position using fuse-blow technology. Each program cycle consumes ~4 mA for 55 ms and completes in ~350 ms; the device locks during programming to prevent corruption. AD5270BRMZ-100-RL7 supports exactly 50 independent writes - verified by C3 bit in the control register - after which further programming commands are ignored. No external high-voltage supply is needed; the EXT_CAP capacitor enables internal charge-pump operation.
Can AD5270BRMZ-100-RL7 operate with bipolar supplies, and what are the voltage limits?
Yes, AD5270BRMZ-100-RL7 supports true bipolar operation with ±2.5 V supplies (VDD = +2.5 V, VSS = −2.5 V), enabling ground-referenced ac signal adjustment without level shifters. Terminal A and W tolerate voltages from VSS to VDD, allowing bidirectional current flow. Absolute maximum ratings permit VDD to VSS up to 7 V, but specified dual-supply operation is limited to ±2.5 V to ±2.75 V. AD5270BRMZ-100-RL7 maintains full 1024-position resolution and R-Perf mode accuracy under these conditions.
What is the thermal coefficient of resistance for AD5270BRMZ-100-RL7 in rheostat mode?
The AD5270BRMZ-100-RL7 exhibits a guaranteed 5 ppm/°C resistance temperature coefficient (tempco) in rheostat mode when configured with full-scale code, measured across −40°C to +125°C. This low tempco is achieved through matched polysilicon resistor design and on-die thermal compensation. It applies specifically to the A–W terminal resistance and is independent of supply voltage or digital interface activity. AD5270BRMZ-100-RL7's tempco remains stable whether operating in R-Perf or normal mode.
Does AD5270BRMZ-100-RL7 support SPI daisy-chaining, and how is it implemented?
Yes, AD5270BRMZ-100-RL7 supports SPI daisy-chaining via its open-drain SDO pin, which can be connected directly to the DIN pin of the next device in the chain. In daisy-chain mode, a single SYNC signal initiates a multi-frame transfer: each device shifts out its SDO data while simultaneously loading new DIN data. The AD5270BRMZ-100-RL7 requires an external pull-up resistor on SDO (≥2.2 kΩ to VDD) and complies with standard SPI CPOL = 0/CPHA = 1 timing. Up to 8 devices can be chained without timing degradation.
AD5270BRMZ-100-RL7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Taper:
- Linear
- Configuration:
- Rheostat
- Number of Circuits:
- 1
- Number of Taps:
- 1024
- Resistance (Ohms):
- 100k
- Interface:
- SPI
- Memory Type:
- Non-Volatile
- Voltage - Supply:
- 2.7V ~ 5.5V, ±2.5V ~ 2.75V
- Features:
- Cascade Pin
- Tolerance:
- ±1%
- Temperature Coefficient (Typ):
- 5ppm/°C
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 10-MSOP
- Operating Temperature:
- -40°C ~ 125°C
- Resistance - Wiper (Ohms) (Typ):
- 35
AD5270BRMZ-100-RL7 FAQ
1.How can I place an order for AD5270BRMZ-100-RL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD5270BRMZ-100-RL7 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 AD5270BRMZ-100-RL7 reliable?
The price and inventory of AD5270BRMZ-100-RL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD5270BRMZ-100-RL7 is usually 5 days.
3.What payment methods are accepted for AD5270BRMZ-100-RL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD5270BRMZ-100-RL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD5270BRMZ-100-RL7?
AD5270BRMZ-100-RL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD5270BRMZ-100-RL7 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 AD5270BRMZ-100-RL7?
For technical support, including AD5270BRMZ-100-RL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD5270BRMZ-100-RL7 requirements.
6.How does Aetrix verify that AD5270BRMZ-100-RL7 is sourced from the original manufacturer or authorized distributors?
All AD5270BRMZ-100-RL7 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 AD5270BRMZ-100-RL7 meets industry standards.
7.What is the process for return or replacement of AD5270BRMZ-100-RL7?
All AD5270BRMZ-100-RL7 units undergo pre-shipment inspection (PSI). If there is an issue with AD5270BRMZ-100-RL7, 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 AD5270BRMZ-100-RL7 part is unused and in its original packaging.
Return procedure for AD5270BRMZ-100-RL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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