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Analog Devices Inc. AD8428BRZ
- Part No.:
- AD8428BRZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AD8428BRZ.pdf
- Description:
- IC INST AMP 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,879
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Product details
Overview
AD8428BRZ 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 140 dB minimum CMRR, enabling precise extraction of microvolt-level signals in medical patient monitoring and industrial transducer interfaces.
For engineers reviewing the AD8428BRZ datasheet, AD8428BRZ pinout, AD8428BRZ application, or AD8428BRZ equivalent, key selection criteria include its current-feedback architecture enabling 7 GHz gain-bandwidth product, access to internal filter terminals (−FIL/+FIL) for custom frequency shaping, and −40°C to +85°C industrial temperature operation with ±4 V to ±18 V dual-supply flexibility.
Technical Context
The AD8428BRZ employs a 3-op-amp topology with a 200× current-feedback preamplifier stage followed by a 10× difference amplifier stage, achieving 3.5 MHz bandwidth at G = 2000. Its pinout isolates +IN/−IN and +FIL/−FIL to minimize parasitic capacitance mismatch, preserving CMRR above 50 kHz.
Internal 30.15 Ω and matched 6 kΩ/120 kΩ resistor networks ensure <5 ppm/°C gain drift and 0.05% total gain error. The REF terminal provides output level-shifting capability with 132 kΩ input impedance and 0.01% reference gain error, supporting single-supply ADC interfacing when driven by a low-impedance source.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | Fixed 2000× - eliminates external resistor matching errors and ensures stable, repeatable amplification for precision measurement systems. |
| Input Voltage Noise | 1.5 nV/√Hz at 1 kHz - enables resolution of sub-microvolt signals in low-amplitude sensor applications like ECG and strain gauge bridges. |
| Bandwidth | 3.5 MHz at G = 2000 - supports fast transient capture in dynamic physiological monitoring and high-speed industrial feedback loops. |
| CMRR | 140 dB min (DC–60 Hz) - rejects power-line interference and common-mode noise in unshielded or long-cable sensor environments. |
| Gain Drift | 5 ppm/°C - maintains calibration integrity across industrial temperature ranges without active compensation circuitry. |
| Slew Rate | 40 V/μs - prevents distortion on fast-rising sensor outputs such as piezoelectric shock detection or pulse oximetry waveforms. |
| Supply Range | ±4 V to ±18 V - accommodates legacy ±5 V, ±12 V, and ±15 V systems while supporting low-voltage designs down to ±4 V. |
| Operating Temp | −40°C to +85°C - qualified for continuous operation in demanding industrial and medical equipment enclosures. |
Pinout & Package
AD8428BRZ is housed in an 8-lead SOIC_N (Small Outline Integrated Circuit, Narrow) package with standard 1.27 mm pitch, compatible with automated PCB assembly and offering θJA = 121°C/W thermal resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: −IN | Negative differential input | High-impedance node (1||2 GΩ||pF) accepting low-level sensor signals; requires matched layout to +IN for optimal CMRR. |
| 2: −FIL | Negative internal filter node | Access point between first and second gain stages; allows insertion of RC networks to shape frequency response before subtraction. |
| 3: +FIL | Positive internal filter node | Complementary access point to −FIL; enables balanced filtering to preserve differential integrity and prevent CMRR degradation. |
| 4: +IN | Positive differential input | Matched counterpart to −IN; pin placement minimizes trace-length asymmetry critical for >100 kHz CMRR performance. |
| 5: −VS | Negative power supply | Return path for internal bias currents; requires local 0.1 μF ceramic decoupling to suppress high-frequency supply noise coupling. |
| 6: REF | Output reference level | Drives output offset; must be sourced from <1 Ω impedance to avoid CMRR loss due to 120 kΩ internal resistor divider imbalance. |
| 7: OUT | Differential output | Capable of ±(VS − 1.2 V) swing into 10 kΩ; supports direct connection to SAR or sigma-delta ADC inputs with minimal external buffering. |
| 8: +VS | Positive power supply | Primary supply rail; shares same decoupling requirements as −VS to maintain PSRR >120 dB up to 100 Hz. |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow input voltage noise | 1.5 nV/√Hz enables detection of signals buried below 100 nV RMS in biomedical and metrology applications. |
| Internal gain-setting resistors | Precisely matched on-die 30.15 Ω and 6 kΩ networks eliminate external component tolerance errors and thermal tracking mismatches. |
| Filter terminal access | Direct connection to nodes between gain stages allows user-defined pole-zero placement for anti-aliasing or noise reduction without affecting DC accuracy. |
| High-speed settling | 0.75 μs to 0.01% for 10 V step ensures fidelity in pulsed-sensor systems like spirometry or laser distance measurement. |
| ESD robustness | 5000 V HBM rating permits safe handling during board assembly and field service without additional protection circuitry. |
Applications
| ECG Signal Conditioning | Patient Monitoring Front-End |
|---|---|
Use Scenario: Amplifying microvolt-level cardiac depolarization signals from dry-electrode or Ag/AgCl sensors in portable ECG devices. IC Role / Device Role / Timing Role: Primary instrumentation amplifier providing fixed 2000× gain, high CMRR rejection of 50/60 Hz mains interference, and low-noise signal chain foundation. Use Value: Enables accurate R-wave detection and ST-segment analysis without external gain calibration, reducing system BOM and firmware complexity. | Use Scenario: Signal acquisition for multi-parameter bedside monitors measuring respiration, blood pressure, and oxygen saturation. IC Role / Device Role / Timing Role: High-speed, low-drift analog front-end for simultaneous sensor channel conditioning with synchronized sampling. Use Value: Maintains <0.3 μV/°C offset drift across operating temperature, ensuring consistent alarm thresholds and diagnostic accuracy over extended clinical use. |
| Strain Gauge Bridge Interface | Industrial Transducer Signal Chain |
Use Scenario: Reading full-bridge load cells or pressure sensors in factory automation weighing systems requiring 0.01% linearity. IC Role / Device Role / Timing Role: Precision gain block converting mV-level bridge output to ±10 V range suitable for 16-bit ADCs. Use Value: Delivers 0.05% total gain error and 5 ppm/°C drift, eliminating need for per-unit gain trim and reducing production test time. | Use Scenario: Signal conditioning for vibration sensors in predictive maintenance systems monitoring motor bearing health. IC Role / Device Role / Timing Role: Wideband amplifier capturing 10 kHz+ mechanical resonance signatures with minimal phase distortion. Use Value: 3.5 MHz bandwidth and 40 V/μs slew rate preserve transient fidelity of impact events, enabling accurate FFT-based fault diagnosis. |
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 G = 1000 only; requires external gain stage for G = 2000. | Better for ultra-low-noise applications where gain can be split; less suitable for space-constrained single-stage designs. | Select AD8429ARZ only if system-level noise budget demands <1.2 nV/√Hz and board area allows two-stage amplification. |
| INA128UA | Higher noise (8 nV/√Hz), lower bandwidth (1.3 MHz), adjustable gain (5–10,000), SO-8 package. | Preferred for cost-sensitive, moderate-accuracy industrial sensors where programmable gain justifies trade-offs in speed and noise. | Choose INA128UA when gain flexibility outweighs need for ultralow noise or high-speed response in non-medical applications. |
Compared with AD8428BRZ, AD8429ARZ offers superior noise and bandwidth but lacks fixed G = 2000, while INA128UA provides gain adjustability at the expense of 5× higher noise and 2.7× lower bandwidth-making AD8428BRZ the optimal choice for compact, high-fidelity medical and test equipment signal chains.
Availability
AD8428BRZ 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 guaranteed traceable sourcing.
Supply support for AD8428BRZ 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 healthcare markets.
The AD8428BRZ belongs to Analog Devices' precision instrumentation amplifier product line, engineered specifically for ultralow-noise, high-gain, high-bandwidth sensor signal extraction in medical diagnostics and industrial metrology.
FAQ
What is the maximum supply voltage for the AD8428BRZ?
The AD8428BRZ supports dual-supply operation from ±4 V to ±18 V. Absolute maximum ratings specify ±18 V on both +VS and −VS pins; exceeding this risks permanent damage. Operation at ±18 V enables full output swing (±16.8 V into 10 kΩ) while maintaining specified gain accuracy and noise performance across the −40°C to +85°C temperature range. Always observe proper decoupling with 0.1 μF ceramics at each supply pin.
Does the AD8428BRZ require external gain-setting resistors?
No, the AD8428BRZ does not require external gain-setting resistors. All gain-setting components-including the 30.15 Ω and matched 6 kΩ/120 kΩ networks-are integrated on-die and laser-trimmed for precision. This internal architecture delivers fixed G = 2000 with 0.05% total gain error and 5 ppm/°C drift, eliminating external component variation, thermal mismatch, and PCB layout sensitivity that plague discrete resistor-based designs.
How does the REF pin function in the AD8428BRZ?
The REF pin in the AD8428BRZ sets the output common-mode voltage: VOUT = 2000 × (V+IN − V−IN) + VREF. It features 132 kΩ input impedance and 0.01% reference gain error. To preserve CMRR, the driving source must have <1 Ω output impedance-excess impedance unbalances the internal 120 kΩ resistor network. The AD8428BRZ REF pin is commonly tied to mid-supply or an ADC reference voltage to enable single-supply data acquisition.
Can the AD8428BRZ operate with single-supply voltages?
The AD8428BRZ is designed for dual-supply operation (±4 V to ±18 V) and does not support true single-supply operation. However, it can interface with single-supply ADCs by driving the REF pin with a stable mid-rail voltage (e.g., +7.5 V when using ±15 V supplies). Input common-mode range extends to −VS + 2.5 V and +VS − 2.5 V, permitting rail-to-rail input operation within those bounds. Attempting to run with only +VS and ground violates absolute maximum ratings and will damage the device.
What is the purpose of the −FIL and +FIL pins on the AD8428BRZ?
The −FIL and +FIL pins on the AD8428BRZ provide access to internal nodes between the 200× preamplifier and 10× difference amplifier stages. Adding passive RC networks across these terminals modifies frequency response prior to final subtraction, enabling user-defined low-pass filtering, notch rejection, or bandwidth limiting without degrading DC accuracy or CMRR. This feature allows the AD8428BRZ to serve as both amplifier and anti-aliasing filter in compact, high-integration signal chains.
AD8428BRZ 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:
- 25 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
AD8428BRZ FAQ
1.How can I place an order for AD8428BRZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD8428BRZ 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 AD8428BRZ reliable?
The price and inventory of AD8428BRZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD8428BRZ is usually 5 days.
3.What payment methods are accepted for AD8428BRZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD8428BRZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD8428BRZ?
AD8428BRZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD8428BRZ 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 AD8428BRZ?
For technical support, including AD8428BRZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD8428BRZ requirements.
6.How does Aetrix verify that AD8428BRZ is sourced from the original manufacturer or authorized distributors?
All AD8428BRZ 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 AD8428BRZ meets industry standards.
7.What is the process for return or replacement of AD8428BRZ?
All AD8428BRZ units undergo pre-shipment inspection (PSI). If there is an issue with AD8428BRZ, 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 AD8428BRZ part is unused and in its original packaging.
Return procedure for AD8428BRZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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