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Analog Devices Inc. ADA4255ACPZ-R7
- Part No.:
- ADA4255ACPZ-R7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 28-WFQFN Exposed Pad, CSP
- Datasheet:
-
ADA4255ACPZ-R7.pdf
- Description:
- IC ZERO AMP 1 CIRCUIT 28LFCSP
- Quantity:
- Payment:
- Shipping:
Inventory:4,382
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Product details
Overview
ADA4255ACPZ-R7 from Analog Devices is a zero-drift, high-voltage programmable gain instrumentation amplifier (PGIA) with integrated bipolar charge pump. It delivers 36 precision gains from 1/16 V/V to 176 V/V, ±14 μV max input offset voltage, and ±60 V input protection - enabling direct connection to industrial sensors in universal process control front ends.
For engineers reviewing the ADA4255ACPZ-R7 datasheet, ADA4255ACPZ-R7 pinout, ADA4255ACPZ-R7 application, or ADA4255ACPZ-R7 equivalent, this device supports high-precision data acquisition with integrated EMI filtering, SPI-controlled gain calibration, excitation current sourcing for RTDs, and robust fault detection across −40°C to +105°C.
Technical Context
The ADA4255ACPZ-R7 implements a zero-drift PGIA topology using chopper-stabilized amplifiers to self-calibrate dc errors and suppress 1/f noise, achieving ±0.08 μV/°C max offset drift and ±1 ppm/°C max gain drift. Its integrated bipolar charge pump generates ±22 V high-voltage rails (VDDH/VSSH) from a 5 V supply, enabling 38 V typical input range without external isolation components.
It integrates a 2:1 robust input multiplexer with ±60 V fault tolerance, seven configurable GPIOs supporting sequential chip select and fault interrupt, and an excitation current source (100–1500 μA) with ±3% initial tolerance - all managed via SPI interface with CRC checksum support and register-level error detection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain Range | 36 precision settings from 1/16 V/V to 176 V/V - enables single-device scaling of mV- to V-range sensor outputs to ADC full-scale. |
| Input Offset Voltage | ±14 μV max - ensures sub-μV-level dc accuracy in high-resolution weigh scales and strain gauge interfaces. |
| Gain Drift | ±1 ppm/°C max - eliminates recalibration over temperature in PLC analog input modules. |
| CMRR | 111 dB min at G = 1 V/V - maintains signal integrity in noisy industrial environments with common-mode transients. |
| Charge Pump Output | VDDH = +22.3 V typ, VSSH = −21.7 V typ at 500 μA load - supplies internal high-voltage rails without external DC/DC converters. |
| Excitation Current | 100–1500 μA, ±3% initial tolerance - directly biases 2-/3-/4-wire RTDs without external current sources. |
| Digital Interface | SPI with CRC checksum, 5 MHz max clock - enables secure, error-resilient configuration and real-time diagnostics in safety-critical systems. |
Pinout & Package
ADA4255ACPZ-R7 is housed in a compact 28-lead, 5 mm × 5 mm LFCSP package with exposed pad (EPAD) connected to VSSH. The package supports high thermal efficiency (θJA = 36.9°C/W) and robust PCB mounting for industrial applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| +IN1, −IN1 +IN2, −IN2 | Differential input pairs | Accept ±60 V protected inputs; support 2-channel sensor selection via internal multiplexer. |
| +OUT, −OUT | Differential output | Delivers rail-to-rail swing (AVSS + 0.06 V to AVDD − 0.08 V) into 2.49 kΩ load - interfaces directly with differential-input ADCs. |
| VOCM | Output common-mode voltage reference | High-impedance input sets output common-mode level (e.g., AVDD/2) - enables precise level-shifting for ADC input ranges. |
| VDDCP, VDDH, VSSH | Charge pump supply and outputs | VDDCP powers internal charge pump; VDDH/VSSH provide ±22 V rails - eliminate need for external high-voltage supplies. |
| IOUT | Excitation current source output | Programmable 100–1500 μA sink/source - drives RTD bridges with matched current paths and low drift. |
| GPIO0–GPIO6 | Configurable general-purpose I/O | Support SCS mode, fault interrupt, external mux control, and calibration busy signaling - reduce system MCU GPIO count. |
| SDI/SDO/SCLK/CS | SPI interface | Full-duplex SPI with CRC checksum - enables secure register access and error detection in noisy industrial buses. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated bipolar charge pump | Generates ±22 V internal rails from 5 V supply - removes external DC/DC converters and simplifies isolated front-end design. |
| 36 precision gain settings | Combines 12 binary-weighted input gains and 3 output scaling factors - enables optimal dynamic range matching for diverse sensor types and ADCs. |
| ±60 V input protection with auto-mux disconnect | Triggers MUX_OVER_VOLT_ERR flag and opens input switches on overvoltage - prevents damage during field wiring faults or surge events. |
| Zero-drift architecture with gain calibration memory | Self-calibrates offset and gain errors; stores coefficients in nonvolatile memory - reduces system-level calibration to once-per-lifetime in many applications. |
| Integrated EMI filtering and 7 GPIOs | On-chip RC filters suppress RF interference; GPIOs support SCS mode and fault signaling - minimize external components and enhance system reliability. |
Applications
| Universal Process Control Front Ends | Data Acquisition Systems |
|---|---|
Use Scenario: Analog input modules in PLCs and DCS receiving signals from thermocouples, RTDs, and 4–20 mA transmitters in chemical plants. IC Role / Device Role / Timing Role: Precision PGIA conditions sensor signals, provides programmable gain, excitation current, and high-voltage isolation - acts as the first-stage signal conditioner before ADC sampling. Use Value: ±14 μV offset and ±1 ppm/°C gain drift enable <0.01% total unadjusted error over temperature - reducing calibration frequency and improving long-term measurement stability. | Use Scenario: High-channel-count DAQ systems for test benches measuring vibration, pressure, and temperature across multiple sensors simultaneously. IC Role / Device Role / Timing Role: Configurable gain and dual-input multiplexer allow time-multiplexed acquisition from up to two independent sensor channels per device - streamlines BOM and layout. Use Value: Integrated EMI filtering and 111 dB CMRR maintain signal fidelity in electrically noisy lab environments - eliminating need for external RC filters or shielded cabling. |
| Test and Measurement Systems | System Power Monitoring |
Use Scenario: Portable calibrators and handheld multimeters requiring high dc precision and wide input range in battery-powered form factors. IC Role / Device Role / Timing Role: Zero-drift PGIA with charge pump delivers wide dynamic range (38 V input) from low-voltage battery supply - replaces discrete op-amp + DC/DC solutions. Use Value: 83 mW total power at DVDD = 3 V, VDDCP = 5 V enables >10-hour operation on single Li-ion cell - extends field usability without compromising accuracy. | Use Scenario: Real-time monitoring of rail voltages, current shunts, and battery packs in industrial UPS and motor drives. IC Role / Device Role / Timing Role: High-impedance inputs and ±60 V protection interface directly to high-side current sense resistors and bus voltage dividers - eliminates level-shifting amplifiers. Use Value: Dedicated output amplifier supplies (AVDD/AVSS) isolate ADC from PGIA power domains - prevents switching noise coupling into sensitive measurements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar programmable gain instrumentation amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD8253ARMZ | 10-bit SPI-programmable gain (1–100×), no integrated charge pump, max ±20 V input, 125 μV max offset. | Lacks high-voltage input capability and excitation current source - requires external DC/DC and RTD biasing circuitry. | Choose AD8253ARMZ when lower cost and simpler supply scheme outweigh need for ±60 V protection and integrated excitation. |
| LTC6373IMS#PBF | 24-bit resolution PGIA with 100 dB CMRR at G=1, no charge pump, 100 μV max offset, supports only single-ended inputs. | No bipolar charge pump or input multiplexer - unsuitable for isolated multi-sensor front ends requiring ±60 V tolerance. | Choose LTC6373IMS#PBF for ultra-low-noise, single-channel precision where high-voltage protection and RTD excitation are not required. |
Compared with AD8253ARMZ and LTC6373IMS#PBF, ADA4255ACPZ-R7 uniquely integrates bipolar charge pump, ±60 V input protection, 7 GPIOs, and RTD excitation - delivering a complete, calibrated signal chain in one IC for rugged industrial analog input modules.
Availability
ADA4255ACPZ-R7 is available at Aetrix Electronics and suitable for universal process control front ends, high-channel data acquisition systems, and test and measurement equipment requiring stable component supply, long-term lifecycle support, and guaranteed traceability.
Supply support for ADA4255ACPZ-R7 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.
The ADA4255ACPZ-R7 belongs to Analog Devices' precision instrumentation amplifier product line, designed specifically for high-reliability industrial signal conditioning - integrating gain, protection, excitation, and diagnostics in a single package for PLC and DAQ front-end applications.
FAQ
What is the maximum input voltage range supported by the ADA4255ACPZ-R7?
The ADA4255ACPZ-R7 supports a guaranteed input operating voltage range of VSSH + 3 V to VDDH − 3 V. With VDDCP = 5 V, typical VDDH = +22.3 V and VSSH = −21.7 V, yielding a 38 V typical input range. Absolute maximum ratings allow ±60 V input voltage relative to VSSH and 60 V differential - confirmed in Table 3 of the datasheet.
Does the ADA4255ACPZ-R7 require external components for RTD excitation?
No, the ADA4255ACPZ-R7 includes an integrated excitation current source (IOUT pin) with programmable output from 100 μA to 1500 μA and ±3% initial tolerance. This eliminates the need for external current sources or precision resistors when biasing 2-/3-/4-wire RTDs - verified in the Excitation Current Source section (p.6) and Register Details (p.61).
How does the ADA4255ACPZ-R7 achieve ±1 ppm/°C gain drift?
The ADA4255ACPZ-R7 achieves ±1 ppm/°C max gain drift through a combination of zero-drift amplifier architecture, laser-trimmed thin-film resistors for gain-setting networks, and on-chip gain calibration memory that stores correction coefficients. These features are detailed in the Gain Drift specification (Table 1, p.4) and Gain Calibration Registers section (p.62).
Can the ADA4255ACPZ-R7 operate without an external clock source?
Yes, the ADA4255ACPZ-R7 includes an internal oscillator with 0.8–1.2 MHz frequency range (typical 1 MHz), allowing full operation without an external clock. External clock synchronization is optional and supported via GPIO4 - confirmed in the Internal/External Clock section (p.7) and GPIO Function Descriptions (p.10).
What protection features does the ADA4255ACPZ-R7 include for industrial environments?
The ADA4255ACPZ-R7 includes ±60 V input overvoltage protection with automatic multiplexer disconnect, integrated EMI filtering, internal/external fault detection (via ANALOG_ERR/DIGITAL_ERR registers), and robust GPIO thresholds. These features are specified in the Absolute Maximum Ratings (p.9), Input Multiplexer section (p.26), and Applications Information (p.39–43).
ADA4255ACPZ-R7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-WFQFN Exposed Pad, CSP
- Packaging:
- Bulk
- Product Status:
- Active
- Amplifier Type:
- Zero-Drift
- Number of Circuits:
- 1
- Output Type:
- Differential
- Slew Rate:
- 1.9V/µs
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 2.3 MHz
- Current - Input Bias:
- 450 nA
- Voltage - Input Offset:
- 3 µV
- Current - Supply:
- 15.6mA
- Current - Output / Channel:
- 11 mA
- Voltage - Supply Span (Min):
- 2.7 V
- Voltage - Supply Span (Max):
- 5 V
- Operating Temperature:
- -40°C ~ 105°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-LFCSP (5x5)
ADA4255ACPZ-R7 FAQ
1.How can I place an order for ADA4255ACPZ-R7 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADA4255ACPZ-R7 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 ADA4255ACPZ-R7 reliable?
The price and inventory of ADA4255ACPZ-R7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADA4255ACPZ-R7 is usually 5 days.
3.What payment methods are accepted for ADA4255ACPZ-R7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADA4255ACPZ-R7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADA4255ACPZ-R7?
ADA4255ACPZ-R7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADA4255ACPZ-R7 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 ADA4255ACPZ-R7?
For technical support, including ADA4255ACPZ-R7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADA4255ACPZ-R7 requirements.
6.How does Aetrix verify that ADA4255ACPZ-R7 is sourced from the original manufacturer or authorized distributors?
All ADA4255ACPZ-R7 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 ADA4255ACPZ-R7 meets industry standards.
7.What is the process for return or replacement of ADA4255ACPZ-R7?
All ADA4255ACPZ-R7 units undergo pre-shipment inspection (PSI). If there is an issue with ADA4255ACPZ-R7, 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 ADA4255ACPZ-R7 part is unused and in its original packaging.
Return procedure for ADA4255ACPZ-R7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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