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Analog Devices Inc. ADA4528-1ACPZ-R2
- Part No.:
- ADA4528-1ACPZ-R2
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-WFDFN Exposed Pad, CSP
- Datasheet:
-
ADA4528-1ACPZ-R2.pdf
- Description:
- IC OPAMP ZERO-DRIFT 1CIRC 8LFCSP
- Quantity:
- Payment:
- Shipping:
Inventory:492
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Product details
Overview
ADA4528-1ACPZ-R2 from Analog Devices is a precision, ultralow noise, rail-to-rail input/output (RRIO), zero-drift operational amplifier in an 8-lead LFCSP package. It delivers 2.5 µV max offset voltage, 0.015 µV/°C max drift, 5.6 nV/√Hz voltage noise density at 1 kHz, and operates from 2.2 V to 5.5 V single supply - ideal for high-accuracy sensor signal conditioning in medical instrumentation and electronic scales.
For engineers reviewing the ADA4528-1ACPZ-R2 datasheet, ADA4528-1ACPZ-R2 pinout, ADA4528-1ACPZ-R2 application, or ADA4528-1ACPZ-R2 equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions for LFCSP layout, application-specific use-value analysis, and two confirmed alternative parts with documented functional and packaging differences.
Technical Context
The ADA4528-1ACPZ-R2 employs a patented auto-zero/chopping architecture that continuously corrects input offset voltage and drift in real time, enabling sub-microvolt DC accuracy over temperature and time. Its dual-stage correction loop suppresses both 1/f and broadband noise while maintaining stability in unity-gain configurations.
This op amp supports rail-to-rail input common-mode range (0 V to VS) and rail-to-rail output swing (within 10 mV of rails at 10 kΩ load), with 130 dB minimum open-loop gain, 135 dB minimum CMRR, and 130 dB minimum PSRR - making it suitable for low-level differential measurements where power supply and common-mode rejection directly impact measurement fidelity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Offset Voltage | 2.5 µV maximum - enables direct amplification of µV-level sensor outputs (e.g., thermocouples) without calibration-induced error accumulation. |
| Offset Drift | 0.015 µV/°C maximum - ensures <1 µV total drift over −40°C to +125°C, critical for unattended industrial monitoring systems. |
| Voltage Noise Density | 5.6 nV/√Hz at 1 kHz - preserves signal integrity in precision data acquisition front-ends where noise floor dominates dynamic range. |
| Input Voltage Range | 0 V to VS (rail-to-rail) - allows full utilization of ADC reference range when interfacing with bridge sensors biased at mid-supply. |
| Supply Range | 2.2 V to 5.5 V single supply - supports battery-powered handheld test equipment and low-voltage IoT sensor nodes. |
| −3 dB Bandwidth | 6.2 MHz at G = +1 - sufficient for fast-settling, high-resolution weigh-scale sampling and ECG lead-off detection. |
| CMRR / PSRR | 135 dB / 130 dB minimum - rejects interference from shared PCB power rails and noisy digital subsystems in mixed-signal embedded designs. |
Pinout & Package
ADA4528-1ACPZ-R2 is packaged in an 8-lead LFCSP (Lead Frame Chip Scale Package) with exposed pad (CP-8-11), optimized for low thermal resistance (θJA = 83.5°C/W) and minimal board area. The exposed pad must be connected to V− or left floating per datasheet guidance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 5, 8 | NIC | No internal connection - must remain unconnected on PCB; no routing or stitching required. |
| 2 | −IN | Inverting input - connects to feedback network in transimpedance or difference amplifier configurations. |
| 3 | +IN | Noninverting input - accepts low-impedance sensor signals (e.g., thermopile output) with minimal loading error. |
| 4 | V− | Negative supply - ties to ground (single-supply) or negative rail; exposed pad is electrically tied to this node. |
| 6 | OUT | Amplified output - drives ADC inputs or downstream filters; capable of sourcing/sinking ±40 mA short-circuit current. |
| 7 | V+ | Positive supply - accepts 2.2 V to 5.5 V; decoupling capacitor (0.1 µF) required within 2 mm for stability. |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow 0.1 Hz–10 Hz noise | 97 nV p-p at AV = +100 - eliminates baseline wander in DC-coupled biomedical amplifiers without AC coupling artifacts. |
| Zero-drift architecture | 0.002 µV/°C typical drift - removes need for periodic system recalibration in field-deployed pressure transducer modules. |
| Rail-to-rail I/O | Output swings to within 10 mV of rails at 10 kΩ - maximizes dynamic range when driving 16-bit SAR ADCs with 2.5 V reference. |
| Unity-gain stable | Phase margin ≥57° at AV = +1 - permits direct use in buffer, follower, and active filter topologies without external compensation. |
| Extended temp range | Specified from −40°C to +125°C - qualified for under-hood automotive sensor interfaces and industrial motor control feedback loops. |
Applications
| Thermocouple Amplification | Load Cell Signal Conditioning |
|---|---|
Use Scenario: Amplifying µV-level Seebeck voltage from Type-K thermocouples across −200°C to +1350°C with cold-junction compensation. IC Role / Device Role / Timing Role: Primary front-end gain stage with programmable gain and low-noise filtering before 24-bit ΣΔ ADC. Use Value: 2.5 µV max offset ensures <0.1°C absolute error at 0°C; 97 nV p-p noise enables resolution better than 0.05°C in 10 Hz bandwidth. |
Use Scenario: Conditioning mV/V output from 350 Ω strain-gauge bridges in industrial weighing platforms. IC Role / Device Role / Timing Role: Instrumentation amplifier input stage (with matched external resistors) providing initial 100× gain and offset nulling. Use Value: 0.015 µV/°C drift prevents >10 ppm zero-shift over ambient temperature swings, meeting OIML R76 Class III accuracy requirements. |
| Portable ECG Front-End | Precision Electronic Scale |
Use Scenario: Biopotential amplification in battery-powered handheld ECG devices with dry electrodes and motion artifact rejection. IC Role / Device Role / Timing Role: First-stage AC-coupled amplifier with high-pass filtering and right-leg drive interface support. Use Value: Rail-to-rail input accepts ±300 mV electrode offsets; 5.6 nV/√Hz noise ensures SNR > 90 dB for 1 mV p-p QRS complexes at 1 kHz. |
Use Scenario: High-resolution weight measurement in retail and laboratory scales using 20-bit+ ADCs and temperature-compensated load cells. IC Role / Device Role / Timing Role: Low-drift, low-noise PGA stage preceding digital filtering and calibration firmware. Use Value: 135 dB CMRR rejects common-mode noise from LED displays and switching power supplies; 6.2 MHz bandwidth supports fast settling for dynamic weighing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD8628ARZ | Higher 1/f noise (120 nV p-p), 10× higher input bias current (12 pA typ), same LFCSP-8 package. | Limited to lower-precision instrumentation where ultra-low drift is secondary to cost. | Choose AD8628ARZ only if supply current budget allows 2.5 mA vs. ADA4528-1's 1.7 mA and 0.015 µV/°C drift is not required. |
| ADA4638-1ARZ | Lower noise (5.8 nV/√Hz), but higher offset drift (0.1 µV/°C max), MSOP-8 only (no LFCSP option). | Better for wideband precision apps (e.g., photodiode TIA), less suited for long-term DC stability in uncalibrated systems. | Select ADA4638-1ARZ when bandwidth >10 MHz is needed and thermal drift can be managed via system-level calibration. |
Compared with AD8628ARZ and ADA4638-1ARZ, the ADA4528-1ACPZ-R2 uniquely combines sub-µV drift, ultralow 1/f noise, and LFCSP packaging - making it the only choice for battery-powered, maintenance-free precision measurement where zero-point stability over temperature and time is non-negotiable.
Availability
ADA4528-1ACPZ-R2 is available at Aetrix Electronics and suitable for thermocouple amplification, load cell signal conditioning, and portable ECG front-end designs requiring stable component supply across extended temperature ranges and multi-year production cycles.
Supply support for ADA4528-1ACPZ-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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA.
The ADA4528-1ACPZ-R2 belongs to Analog Devices' zero-drift op amp portfolio, engineered specifically for applications demanding nanovolt-level DC accuracy, such as medical diagnostics, scientific instrumentation, and industrial process control.
FAQ
What is the maximum operating temperature range for the ADA4528-1ACPZ-R2?
The ADA4528-1ACPZ-R2 is fully specified from −40°C to +125°C, with all key parameters-including offset voltage, drift, CMRR, and PSRR-guaranteed across this extended industrial temperature range. This makes ADA4528-1ACPZ-R2 suitable for under-hood automotive sensors, industrial motor drives, and outdoor environmental monitoring systems where thermal robustness is essential.
Does the ADA4528-1ACPZ-R2 require external compensation for unity-gain stability?
No, the ADA4528-1ACPZ-R2 is internally compensated and unity-gain stable, with ≥57° phase margin at AV = +1. No external capacitors or resistors are needed for stability in buffer, follower, or inverting amplifier configurations. This simplifies layout and reduces bill-of-materials cost compared to decompensated precision op amps.
How does the exposed pad on the ADA4528-1ACPZ-R2 LFCSP package affect thermal performance?
The exposed pad on the ADA4528-1ACPZ-R2 improves thermal dissipation, lowering junction-to-ambient thermal resistance to 83.5°C/W (vs. 142°C/W for MSOP). Per the datasheet, it must be connected to V− (ground in single-supply) or left unconnected-no thermal vias to internal planes are required, but soldering it to a copper pour enhances reliability in high-temperature operation.
Can the ADA4528-1ACPZ-R2 drive capacitive loads directly?
The ADA4528-1ACPZ-R2 maintains stability with up to 100 pF capacitive load at unity gain, as verified in Figure 40 and Figure 43 of the datasheet. For larger loads (>100 pF), a series resistor (≥100 Ω) between the output and capacitance is recommended to prevent peaking or oscillation-critical when driving ADC input filters or long PCB traces.
What is the typical supply current of the ADA4528-1ACPZ-R2 at 2.5 V operation?
At 2.5 V supply and 25°C, the ADA4528-1ACPZ-R2 draws 1.4 mA typical supply current per amplifier (max 2.1 mA over temperature). This low quiescent current enables use in energy-constrained applications like handheld multimeters and battery-powered sensor nodes while preserving nanovolt-level precision.
ADA4528-1ACPZ-R2 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-WFDFN Exposed Pad, CSP
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- Zero-Drift
- Number of Circuits:
- 1
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 0.5V/µs
- Gain Bandwidth Product:
- 4 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 90 pA
- Voltage - Input Offset:
- 0.3 µV
- Current - Supply:
- 1.5mA
- Current - Output / Channel:
- 40 mA
- Voltage - Supply Span (Min):
- 2.2 V
- Voltage - Supply Span (Max):
- 5.5 V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-LFCSP-WD (3x3)
ADA4528-1ACPZ-R2 FAQ
1.How can I place an order for ADA4528-1ACPZ-R2 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADA4528-1ACPZ-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 ADA4528-1ACPZ-R2 reliable?
The price and inventory of ADA4528-1ACPZ-R2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADA4528-1ACPZ-R2 is usually 5 days.
3.What payment methods are accepted for ADA4528-1ACPZ-R2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADA4528-1ACPZ-R2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADA4528-1ACPZ-R2?
ADA4528-1ACPZ-R2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADA4528-1ACPZ-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 ADA4528-1ACPZ-R2?
For technical support, including ADA4528-1ACPZ-R2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADA4528-1ACPZ-R2 requirements.
6.How does Aetrix verify that ADA4528-1ACPZ-R2 is sourced from the original manufacturer or authorized distributors?
All ADA4528-1ACPZ-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 ADA4528-1ACPZ-R2 meets industry standards.
7.What is the process for return or replacement of ADA4528-1ACPZ-R2?
All ADA4528-1ACPZ-R2 units undergo pre-shipment inspection (PSI). If there is an issue with ADA4528-1ACPZ-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 ADA4528-1ACPZ-R2 part is unused and in its original packaging.
Return procedure for ADA4528-1ACPZ-R2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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