AD8608ARZ - Quad Precision CMOS Rail-to-Rail Op Amp | Analog Devices
MPN: AD8608ARZ ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $2.85 | $2.85 |
| 10 | $2.56 | $25.60 |
| 100 | $2.28 | $228.00 |
| 500 | $2.05 | $1,025.00 |
| 1,000 | $1.82 | $1,820.00 |
Drop-in alternatives for AD8608ARZ — 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:
AD8608ARZ-REEL7
✅ Drop-In📋 Reference alternative (not in catalog)
AD8608ARZ Maximum Ratings & Electrical Characteristics
| Number of Channels | 4 |
| Supply Voltage Range | 2.7 V to 5.5 V |
| Input Offset Voltage (max) | 65 µV |
| Input Bias Current (max) | 1 pA |
| Voltage Noise Density | 8 nV/√Hz |
| Gain Bandwidth Product | 10 MHz |
| Open-Loop Gain | 1000 V/mV |
| Rail-to-Rail Input | Yes |
| Rail-to-Rail Output | Yes |
| Unity Gain Stable | Yes |
| Package | 14-lead SOIC (narrow body) |
| Operating Temperature Range | -40°C to +125°C |
| RoHS Compliant | Yes |
| Slew Rate | [DATA_NEEDED: Slew Rate] |
| Supply Current per Amplifier | [DATA_NEEDED: Supply Current per Amplifier] |
AD8608ARZ Pin Configuration
| Pin 1 | OUT A — Output of amplifier A |
| Pin 2 | -IN A — Inverting input of amplifier A |
| Pin 3 | +IN A — Non-inverting input of amplifier A |
| Pin 4 | V+ — Positive supply |
| Pin 5 | +IN B — Non-inverting input of amplifier B |
| Pin 6 | -IN B — Inverting input of amplifier B |
| Pin 7 | OUT B — Output of amplifier B |
| Pin 8 | OUT C — Output of amplifier C |
| Pin 9 | -IN C — Inverting input of amplifier C |
| Pin 10 | +IN C — Non-inverting input of amplifier C |
| Pin 11 | V- — Negative supply (ground in single-supply) |
| Pin 12 | +IN D — Non-inverting input of amplifier D |
| Pin 13 | -IN D — Inverting input of amplifier D |
| Pin 14 | OUT D — Output of amplifier D |
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
AD8608ARZ is suitable for 6 applications: Precision Active Filters, Photodiode Amplifiers, Battery-Powered Instrumentation, Portable Medical Devices, Audio Signal Conditioning, Data Acquisition Systems.
Precision Active Filters
The AD8608ARZ's low offset voltage (65 µV max) and wide bandwidth (10 MHz) make it ideal for active filter designs. In a multiple-feedback low-pass filter, the quad configuration allows implementing 4th-order filters in a single package. The rail-to-rail output ensures maximum signal swing, while the low noise (8 nV/√Hz) preserves signal integrity. For high-Q filters, the high open-loop gain (1000 V/mV) minimizes gain error. The CMOS input stage with 1 pA bias current reduces DC errors from source impedance. This makes the AD8608ARZ suitable for anti-aliasing filters in data acquisition systems and audio crossover networks.
Recommended
Photodiode Amplifiers
The AD8608ARZ's ultra-low input bias current (1 pA max) is essential for photodiode transimpedance amplifiers, where bias current errors directly affect accuracy. The low voltage noise (8 nV/√Hz) and wide bandwidth (10 MHz) support high-speed optical detection. In a transimpedance configuration, the amplifier converts photodiode current to voltage with high precision. The rail-to-rail output allows full-scale voltage swing for subsequent ADC conversion. The quad configuration enables multi-channel light sensing in applications like pulse oximetry and ambient light monitoring. The CMOS input stage minimizes leakage current, ensuring accurate low-light measurements.
Recommended
Battery-Powered Instrumentation
The AD8608ARZ operates from a single 2.7V to 5.5V supply, making it ideal for battery-powered instruments. Its low supply current (per amplifier) extends battery life, while the rail-to-rail input/output maximizes dynamic range in low-voltage systems. The quad configuration reduces component count and board space in multi-channel data loggers. The low offset voltage (65 µV) and low noise (8 nV/√Hz) ensure accurate measurements in portable medical devices and field instruments. The wide bandwidth (10 MHz) supports real-time signal processing. The CMOS input stage with 1 pA bias current is suitable for high-impedance sensors like pH probes.
Recommended
Portable Medical Devices
The AD8608ARZ's low noise (8 nV/√Hz) and low offset (65 µV) are critical for medical instrumentation like ECG and EEG amplifiers. The rail-to-rail input/output allows operation at low supply voltages, essential for battery-powered devices. The quad configuration enables multi-channel biopotential measurement in a compact SOIC-14 package. The high input impedance (due to 1 pA bias current) prevents loading of biological signals. The wide bandwidth (10 MHz) supports high-frequency components in neurological signals. The industrial temperature range (-40°C to +125°C) ensures reliability in clinical environments.
Recommended
Audio Signal Conditioning
The AD8608ARZ's low distortion and wide bandwidth (10 MHz) make it suitable for audio applications such as active crossovers and equalizers. The low noise (8 nV/√Hz) ensures a clean signal path, while the rail-to-rail output provides maximum headroom in single-supply audio systems. The quad configuration allows implementing stereo filters in one package. The high open-loop gain (1000 V/mV) reduces harmonic distortion. The CMOS input stage with 1 pA bias current minimizes DC offset in audio paths. The 2.7V to 5.5V supply range is compatible with portable audio devices.
Recommended
Data Acquisition Systems
The AD8608ARZ is ideal for data acquisition front-ends, providing signal conditioning for ADCs. Its low offset (65 µV) and low noise (8 nV/√Hz) ensure accurate signal conversion. The rail-to-rail output drives ADC inputs to full scale, maximizing dynamic range. The quad configuration allows conditioning multiple channels simultaneously. The wide bandwidth (10 MHz) supports high-speed sampling. The CMOS input stage with 1 pA bias current is suitable for high-impedance sensors. The 2.7V to 5.5V supply range matches modern ADC supply voltages, simplifying power design.
Recommended
Recommended Products Summary
Engineering reference data for AD8608ARZ — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | AD8608ARZ-REEL7 | AD8608ARUZ | AD8628ARZ | OPA4227 | OPA4376 |
|---|---|---|---|---|---|---|
| Package | 14-lead SOIC | 14-lead SOIC | 14-lead TSSOP | 8-lead SOIC | 14-lead SOIC | 14-lead SOIC |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Texas Instruments | Texas Instruments |
| Number of Channels | 4 | 4 | 4 | 1 | 4 | 4 |
| Supply Voltage Range | 2.7V to 5.5V | 2.7V to 5.5V | 2.7V to 5.5V | 2.7V to 5.5V | ±2.5V to ±18V | 2.2V to 5.5V |
| Input Offset Voltage (max) | 65 µV | 65 µV | 65 µV | 5 µV | 75 µV | 25 µV |
| Input Bias Current (max) | 1 pA | 1 pA | 1 pA | 30 pA | 2.5 nA | 0.2 pA |
| Voltage Noise Density | 8 nV/√Hz | 8 nV/√Hz | 8 nV/√Hz | 22 nV/√Hz | 4.5 nV/√Hz | 7.5 nV/√Hz |
| Gain Bandwidth Product | 10 MHz | 10 MHz | 10 MHz | 2.5 MHz | 8 MHz | 5.5 MHz |
Key Differentiators
- Ultra-low input bias current of 1 pA max (vs OPA4227)
- Rail-to-rail input and output (vs OPA4227)
- Quad configuration in SOIC-14 (vs AD8628ARZ)
Design Notes
The AD8608ARZ operates from a single 2.7V to 5.5V supply. Use a 0.1 µF ceramic capacitor close to each supply pin (V+ and V-) to decouple high-frequency noise. For best performance, also add a 10 µF tantalum capacitor in parallel for low-frequency decoupling. Ensure the supply voltage does not exceed 5.5V to avoid damage.
For optimal performance, place the AD8608ARZ away from high-frequency digital circuits. Use a ground plane to minimize noise coupling. Keep feedback resistors and input traces short to reduce parasitic capacitance. For high-impedance inputs, guard rings around the input pins can reduce leakage currents.
The rail-to-rail output stage can drive capacitive loads, but for loads exceeding 100 pF, a series resistor (e.g., 50-100 Ω) is recommended to maintain stability. Also, avoid exceeding the absolute maximum supply voltage of 6V. The input common-mode range extends beyond the rails, but do not apply voltages beyond the supply rails to prevent latch-up.
Compliance Information
RoHS compliant per Analog Devices product page. No AEC-Q100 qualification indicated for this part.
