AD8429BRZ - 1nV/√Hz Ultra-Low Noise In-Amp | Analog Devices
MPN: AD8429BRZ ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $10.43 | $10.43 |
| 10 | $9.55 | $95.50 |
| 100 | $8.12 | $812.00 |
| 500 | $7.28 | $3,640.00 |
| 1,000 | $6.85 | $6,850.00 |
Drop-in alternatives for AD8429BRZ — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
AD8429ARZ
✅ Drop-In✓ In Stock
$5.5 / Unit
View Datasheet →AD8429BRZ-R7
✅ Drop-In📋 Reference alternative (not in catalog)
AD8221ARZ
✅ Drop-In✓ In Stock
$3.29 / Unit
View Datasheet →AD8228ARZ
✅ Drop-In📋 Reference alternative (not in catalog)
INA128UA
✅ Drop-In📋 Reference alternative (not in catalog)
AD8429BRZ Maximum Ratings & Electrical Characteristics
| Input Noise Voltage Density | 1 nV/√Hz |
| Output Noise Voltage Density | 45 nV/√Hz |
| CMRR (Minimum, G=1) | 90 dB |
| Input Offset Voltage (Maximum) | 50 µV |
| Gain Accuracy (Maximum, G=1) | 0.02% |
| CMRR to 5 kHz (G=1) | 80 dB |
| Bandwidth (G=1) | 15 MHz |
| Bandwidth (G=100) | 1.2 MHz |
| Slew Rate | 22 V/µs |
| THD (1 kHz, G=1) | -130 dBc |
| Supply Voltage Range | ±4 V to ±18 V |
| Operating Temperature Range | -40°C to +125°C |
| Package | 8-SOIC |
| Mounting Type | Surface Mount |
| Number of Circuits | 1 |
AD8429BRZ Pin Configuration
| Pin 1 | RG — Gain setting resistor connection |
| Pin 2 | -IN — Inverting input |
| Pin 3 | +IN — Non-inverting input |
| Pin 4 | -VS — Negative supply |
| Pin 5 | REF — Reference voltage for output level shifting |
| Pin 6 | OUT — Output |
| Pin 7 | +VS — Positive supply |
| Pin 8 | RG — Gain setting resistor connection |
Safe Operating Area (SOA) & Thermal Characteristics
No official SOA curve available for this component. Always operate within absolute maximum ratings specified in the datasheet. Ensure adequate cooling and derate as needed.
Typical Applications
AD8429BRZ is suitable for 6 applications: Medical Instrumentation (ECG/EEG), Industrial Process Control, Precision Data Acquisition, Transducer Signal Conditioning, Audio Test and Measurement, Vibration Monitoring.
Medical Instrumentation (ECG/EEG)
The AD8429BRZ's ultralow input noise of 1 nV/√Hz and high CMRR of 90 dB minimum at G=1 make it ideal for amplifying microvolt-level biopotential signals. In ECG systems, it rejects 50/60 Hz common-mode interference from the body and power lines, ensuring clean signal acquisition. The wide bandwidth of 15 MHz at G=1 supports high-resolution QRS detection. Its -40°C to +125°C range allows use in portable and clinical devices. The REF pin enables level shifting for single-supply ADCs, simplifying interface to digital processors.
Recommended
Industrial Process Control
In industrial process control, the AD8429BRZ accurately conditions signals from pressure, temperature, and flow sensors. Its high CMRR of 90 dB at G=1 rejects common-mode noise from long cable runs and motor drives. The low input offset voltage of 50 µV max ensures precise measurement of small sensor outputs. The wide supply range of ±4 V to ±18 V accommodates standard industrial rails. The device's robustness over -40°C to +125°C makes it suitable for harsh factory environments. Its 15 MHz bandwidth allows fast response to process changes.
Recommended
Precision Data Acquisition
The AD8429BRZ is ideal for precision data acquisition systems requiring high resolution and low noise. Its 1 nV/√Hz input noise and 0.02% gain accuracy at G=1 ensure accurate digitization of small signals. The device's high bandwidth of 15 MHz supports high-speed sampling, while the low THD of -130 dBc preserves signal fidelity. The REF pin allows easy interface to single-supply ADCs, and the wide supply range provides flexibility in system design. Its small 8-SOIC package saves board space in multi-channel systems.
Recommended
Transducer Signal Conditioning
The AD8429BRZ excels in conditioning signals from various transducers, such as strain gauges, thermocouples, and RTDs. Its ultralow noise of 1 nV/√Hz preserves the tiny signal variations from these sensors. The high CMRR rejects common-mode interference from excitation sources and environmental noise. The gain set by a single external resistor allows easy adjustment from 1 to 1000, accommodating different sensor sensitivities. The device's wide temperature range ensures stable performance in varying conditions. Its low offset voltage minimizes measurement error.
Recommended
Audio Test and Measurement
The AD8429BRZ's low THD of -130 dBc and wide bandwidth of 15 MHz make it suitable for audio test equipment. It can accurately amplify low-level audio signals without introducing distortion. The high CMRR rejects ground loops and common-mode noise in test setups. The device's low noise ensures that the measurement system does not mask the signal under test. Its small package allows integration into portable test instruments. The REF pin enables output level shifting for single-supply ADCs in digital audio analyzers.
Recommended
Vibration Monitoring
In vibration monitoring systems, the AD8429BRZ conditions signals from accelerometers and piezoelectric sensors. Its ultralow noise of 1 nV/√Hz allows detection of small vibrations, while the high CMRR rejects interference from motors and power lines. The wide bandwidth of 15 MHz captures high-frequency vibration components. The device's wide supply range and temperature range make it suitable for industrial monitoring equipment. The gain resistor allows optimization for different sensor sensitivities.
Recommended
Recommended Products Summary
Engineering reference data for AD8429BRZ — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | AD8429ARZ | AD8429BRZ-R7 | AD8221ARZ | AD8228ARZ | INA128UA |
|---|---|---|---|---|---|---|
| Package | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Texas Instruments |
| Input Noise Voltage Density | 1 nV/√Hz | 1 nV/√Hz | 1 nV/√Hz | 8 nV/√Hz | 8 nV/√Hz | 8 nV/√Hz |
| CMRR (Min, G=1) | 90 dB | 90 dB | 90 dB | 80 dB | 80 dB | 80 dB |
| Bandwidth (G=1) | 15 MHz | 15 MHz | 15 MHz | 1 MHz | 650 kHz | 200 kHz |
| Input Offset Voltage (Max) | 50 µV | 100 µV | 50 µV | 60 µV | 50 µV | 50 µV |
| Supply Voltage Range | ±4 V to ±18 V | ±4 V to ±18 V | ±4 V to ±18 V | ±2.3 V to ±18 V | ±2.3 V to ±18 V | ±2.25 V to ±18 V |
| Gain Range | 1 to 1000 | 1 to 1000 | 1 to 1000 | 1 to 1000 | Fixed 10 or 100 | 1 to 10000 |
Key Differentiators
- Ultralow input noise of 1 nV/√Hz (vs AD8221ARZ)
- High CMRR of 90 dB minimum at G=1 (vs INA128UA)
- Wide bandwidth of 15 MHz at G=1 (vs AD8228ARZ)
Design Notes
The AD8429BRZ operates from dual supplies of ±4 V to ±18 V. Use low-impedance supply traces and place 0.1 µF ceramic capacitors close to the +VS and -VS pins to decouple high-frequency noise. For best performance, use a 10 µF tantalum capacitor in parallel for bulk decoupling, especially when driving low-impedance loads.
For optimal noise performance, keep the gain-setting resistor (RG) close to the device and use short, direct traces. Avoid routing high-speed digital signals near the input pins to prevent coupling. Use a ground plane under the device to minimize parasitic inductance and provide a low-impedance return path.
The REF pin must be driven with a low-impedance source (<1 Ω) to maintain CMRR and accuracy. Do not exceed the REF pin voltage beyond ±VS by more than 0.3 V, as it is protected by ESD diodes. Ensure the input common-mode voltage stays within the specified range to avoid output saturation.
Compliance Information
RoHS compliant per Analog Devices product page. Not AEC-Q100 qualified.
