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Analog Devices Inc. AD8428ARZ
- Part No.:
- AD8428ARZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AD8428ARZ.pdf
- Description:
- IC INST AMP 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:231
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Product details
Overview
AD8428ARZ from Analog Devices is an ultralow-noise, fixed-gain (G = 2000) instrumentation amplifier optimized for high-speed, high-accuracy sensor signal conditioning. It delivers 1.5 nV/√Hz input voltage noise, 3.5 MHz bandwidth, and 0.05% gain accuracy - enabling precise extraction of microvolt-level biomedical and strain-gauge signals in noisy environments.
For engineers reviewing the AD8428ARZ datasheet, AD8428ARZ pinout, AD8428ARZ application, or AD8428ARZ equivalent, this page provides verified technical context, validated pin functions, real-world use cases in patient monitoring and sensor interfaces, and two confirmed alternative parts with documented functional trade-offs.
Technical Context
The AD8428ARZ uses a current-feedback topology in its first stage (G = 200) followed by a precision difference amplifier (G = 10), achieving a 7 GHz gain-bandwidth product. Its internal 30.15 Ω gain-setting resistor ensures matched ratio accuracy and 5 ppm/°C gain drift.
Pin-accessible internal nodes (−FIL/+FIL) allow external RC networks to shape frequency response between stages, while the REF terminal enables output level-shifting with 1 V/V gain and 0.01% error - critical for single-supply ADC interfacing without compromising CMRR.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | Fixed 2000× (200× first stage + 10× second stage); eliminates external resistor matching errors and drift. |
| Input Voltage Noise | 1.5 nV/√Hz at 1 kHz; enables resolution of sub-μV signals in ECG and load-cell applications. |
| Bandwidth | 3.5 MHz at G = 2000; supports fast transient capture in pulse oximetry and industrial vibration sensing. |
| CMRR | 140 dB min (DC–60 Hz); rejects power-line interference in unshielded medical leads. |
| Gain Drift | 5 ppm/°C over −40°C to +85°C; maintains calibration stability across environmental temperature swings. |
| Supply Range | ±4 V to ±18 V; accommodates both low-voltage portable systems and high-dynamic-range industrial rails. |
| Slew Rate | 40 V/μs; prevents distortion on 10 V step inputs with 0.75 μs settling to 0.01%. |
Pinout & Package
AD8428ARZ is housed in an 8-lead SOIC_N package (θJA = 121°C/W), optimized for thermal performance and PCB layout simplicity. Pin numbering follows standard SOIC top-view orientation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (−IN) | Negative input terminal | Differential input node; requires matched source impedance to +IN for optimal CMRR. |
| 2 (−FIL) | Negative filter terminal | Access point between first and second gain stages; enables insertion of RC networks to suppress RFI or limit bandwidth. |
| 3 (+FIL) | Positive filter terminal | Complementary access node to −FIL; must be paired symmetrically to preserve CMRR above 10 kHz. |
| 4 (+IN) | Positive input terminal | Differential input node; pinout symmetry with −IN minimizes parasitic capacitance mismatch. |
| 5 (−VS) | Negative power supply | Return path for internal bias currents; requires local 0.1 μF ceramic decoupling. |
| 6 (REF) | Reference voltage input | Output offset control node; drives ADC mid-rail with 132 kΩ input impedance and 6.5 μA bias current. |
| 7 (OUT) | Amplified output | Capable of ±13.3 V swing into 10 kΩ at ±15 V supplies; short-circuit protected to 30 mA. |
| 8 (+VS) | Positive power supply | Primary supply rail; shares same decoupling requirements as −VS for PSRR > 120 dB. |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow input voltage noise | 1.5 nV/√Hz enables detection of 50 nV signals buried in 1 kHz noise floor. |
| Internal gain-resistor matching | Monolithic 30.15 Ω resistor network guarantees 0.05% total gain error and 5 ppm/°C drift. |
| Filter terminal accessibility | −FIL/+FIL pins allow stage-specific filtering to suppress RFI without degrading DC accuracy. |
| High CMRR architecture | Pinout and layout-optimized design maintains ≥110 dB CMRR up to 50 kHz for EMI resilience. |
| Reference-driven output offset | REF pin accepts low-impedance voltage sources to shift output to ADC midsupply with 0.01% gain error. |
Applications
| ECG Signal Conditioning | Patient Monitoring Front-End |
|---|---|
Use Scenario: Amplifying 0.5–5 mV differential cardiac signals from dry electrodes in ambulatory ECG devices. IC Role / Device Role / Timing Role: Primary signal-conditioning stage converting microvolt biopotentials to 1–10 V full-scale ADC inputs. Use Value: 1.5 nV/√Hz noise floor and 140 dB CMRR reject 50/60 Hz mains interference without active guarding. | Use Scenario: Isolating and amplifying respiration, SpO₂, and NIBP sensor outputs in multi-parameter bedside monitors. IC Role / Device Role / Timing Role: High-speed instrumentation amplifier driving SAR ADCs at ≥1 MSPS sampling rates. Use Value: 3.5 MHz bandwidth and 40 V/μs slew rate preserve pulse fidelity during rapid physiological transients. |
| Strain-Gauge Bridge Interface | Industrial Load-Cell Readout |
Use Scenario: Reading 2–3 mV full-scale output from 350 Ω Wheatstone bridges in precision weighing systems. IC Role / Device Role / Timing Role: Fixed-gain front-end eliminating trimming resistors and reducing calibration complexity. Use Value: 0.05% gain accuracy and 5 ppm/°C drift ensure ≤0.01% FS error over −40°C to +85°C operating range. | Use Scenario: Digitizing millivolt-level outputs from 1000 Ω load cells in factory automation force-sensing nodes. IC Role / Device Role / Timing Role: Low-drift signal conditioner interfacing with isolated ΣΔ ADCs via REF pin level-shifting. Use Value: REF terminal enables direct connection to 2.5 V reference, eliminating external op-amp level-shift circuitry. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar instrumentation amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD8429ARZ | Lower noise (1.0 nV/√Hz), higher bandwidth (4.5 MHz), but 10× higher quiescent current (12 mA vs. 6.8 mA). | Better for ultra-low-noise lab equipment; less suitable for battery-powered portable monitors. | Select AD8429ARZ only when noise <1.2 nV/√Hz is mandatory and power budget allows ≥70% increase. |
| INA128UA | Adjustable gain (1–10,000), higher offset drift (2 μV/°C), lower bandwidth (1.3 MHz), no filter terminals. | Preferred for multi-gain test equipment; lacks AD8428ARZ's RFI suppression capability and speed. | Choose INA128UA when gain flexibility outweighs need for 3.5 MHz bandwidth and 1.5 nV/√Hz noise. |
Compared with AD8428ARZ, AD8429ARZ trades power efficiency for marginal noise/bandwidth gains, while INA128UA sacrifices speed and integrated RFI mitigation for programmable gain - making AD8428ARZ optimal for fixed-gain, high-speed, low-noise medical and industrial sensor interfaces.
Availability
AD8428ARZ is available at Aetrix Electronics and suitable for ECG signal conditioning, patient monitoring front-ends, and strain-gauge bridge interface applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for AD8428ARZ 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 measurement, industrial, and healthcare markets since 1965.
The AD8428ARZ belongs to Analog Devices' precision instrumentation amplifier product line, engineered specifically for ultralow-noise, high-speed sensor signal extraction in medical diagnostics and industrial test equipment.
FAQ
What is the maximum operating temperature for the AD8428ARZ?
The AD8428ARZ operates reliably up to +125°C junction temperature, with full parametric performance specified from −40°C to +85°C ambient. At +85°C, output swing remains ≥±13.1 V into 10 kΩ with ±15 V supplies, and gain drift stays within 5 ppm/°C. Thermal derating is required above +85°C ambient per θJA = 121°C/W.
Does the AD8428ARZ require external gain-setting resistors?
No, the AD8428ARZ has all gain-setting resistors monolithically integrated, including the critical 30.15 Ω resistor that sets the 2000× total gain. This eliminates external component matching errors, reduces board space, and ensures 0.05% gain accuracy and 5 ppm/°C drift across temperature - unlike discrete-resistor-based instrumentation amplifiers.
How does the REF pin function in the AD8428ARZ?
The REF pin in the AD8428ARZ sets the output common-mode voltage with 1 V/V gain and 0.01% error. Driving REF with a low-impedance 2.5 V source shifts the output to center around 2.5 V - enabling direct interface with single-supply 5 V ADCs. Source impedance must remain <1 Ω to prevent CMRR degradation from added 120 kΩ series resistance.
Can the AD8428ARZ drive capacitive loads directly?
The AD8428ARZ can drive up to 500 pF capacitive load without instability, as verified in Figure 35 of the datasheet. For loads >500 pF, a series isolation resistor (≥10 Ω) is required between OUT and the capacitor to maintain phase margin. Output voltage swing degrades by ≤0.2 V at 770 pF, confirming robust capacitive drive capability for ADC input filtering.
What is the purpose of the −FIL and +FIL pins on the AD8428ARZ?
The −FIL and +FIL pins on the AD8428ARZ provide access to internal nodes between the first (G = 200) and second (G = 10) gain stages. Adding matched RC networks here allows targeted high-frequency roll-off before the final amplification stage - suppressing RFI and preventing aliasing without affecting DC gain accuracy or CMRR below 10 kHz.
AD8428ARZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Amplifier Type:
- Instrumentation
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 50V/µs
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 3.5 MHz
- Current - Input Bias:
- 200 nA
- Voltage - Input Offset:
- 100 µV
- Current - Supply:
- 6.5mA
- Current - Output / Channel:
- 30 mA
- Voltage - Supply Span (Min):
- 8 V
- Voltage - Supply Span (Max):
- 36 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
AD8428ARZ FAQ
1.How can I place an order for AD8428ARZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD8428ARZ 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 AD8428ARZ reliable?
The price and inventory of AD8428ARZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD8428ARZ is usually 5 days.
3.What payment methods are accepted for AD8428ARZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD8428ARZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD8428ARZ?
AD8428ARZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD8428ARZ 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 AD8428ARZ?
For technical support, including AD8428ARZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD8428ARZ requirements.
6.How does Aetrix verify that AD8428ARZ is sourced from the original manufacturer or authorized distributors?
All AD8428ARZ 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 AD8428ARZ meets industry standards.
7.What is the process for return or replacement of AD8428ARZ?
All AD8428ARZ units undergo pre-shipment inspection (PSI). If there is an issue with AD8428ARZ, 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 AD8428ARZ part is unused and in its original packaging.
Return procedure for AD8428ARZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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