AD8605ARZ-REEL7 - Precision CMOS RRIO Op Amp | Analog Devices
MPN: AD8605ARZ-REEL7 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $1.52 | $1.52 |
| 10 | $1.36 | $13.60 |
| 100 | $1.09 | $109.00 |
| 500 | $0.92 | $460.00 |
| 1,000 | $0.78 | $780.00 |
AD8605ARZ-REEL7 Overview
An operational amplifier (op amp) is a high-gain voltage amplifier with differential inputs and a single-ended output. It is a fundamental building block in analog electronics, used in signal conditioning, filtering, and amplification circuits. The AD8605 belongs to the class of CMOS rail-to-rail op amps, which are characterized by their ability to handle input and output signals that swing close to the supply rails. This makes them particularly useful in single-supply systems where the available voltage headroom is limited. Within the hierarchy of amplifiers, the AD8605 is a precision op amp, distinguished by its low offset voltage and low noise, making it suitable for high-accuracy applications.
Key features of the AD8605ARZ-REEL7 include its rail-to-rail input and output capability, which maximizes dynamic range in low-voltage applications. The low offset voltage of 65 µV (typical) and low input bias current of 1 pA (typical) ensure high precision in sensor interface and instrumentation circuits. The wide signal bandwidth of 10 MHz (typical) and slew rate of 5 V/µs (typical) allow it to handle moderate-speed signals. Additionally, the op amp features a low quiescent current of 1.3 mA (typical), which is beneficial for power-sensitive designs.
Technically, the AD8605 uses Analog Devices' DigiTrim technology, which provides precision trimming of the offset voltage without the need for external components. This results in a very low offset voltage that is stable over temperature. The CMOS input stage provides extremely high input impedance, minimizing loading on the signal source. The output stage is rail-to-rail, capable of driving loads down to 600 Ω, making it versatile for various applications.
Typical applications for the AD8605ARZ-REEL7 include photodiode amplification, battery-powered instrumentation, active filters, and portable medical devices. Its low noise and low offset make it ideal for precision signal conditioning, while its rail-to-rail operation allows it to interface directly with ADCs and DACs in single-supply systems.
When designing with the AD8605, it is important to provide adequate power supply decoupling with 0.1 µF ceramic capacitors placed close to the supply pins. Additionally, for optimal performance, keep the input traces short and shielded to minimize noise pickup.
Drop-in alternatives for AD8605ARZ-REEL7 — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with AD8605ARZ-REEL7 (same form factor and footprint) — differing in Gain Bandwidth Product, Amplifier Type, Input Bias Current, Input Voltage Noise Density, Package.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
AD8605ARZ
✅ Drop-In✓ In Stock
$1.79 / Unit
View Datasheet →AD8606ARZ
⚡ Same Package✓ In Stock
$1.3 / Unit
View Datasheet →OPA376AIDR
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
MCP6V11-E/SN
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
AD8605ARZ-REEL7 Maximum Ratings & Electrical Characteristics
| Number of Channels | 1 |
| Supply Voltage Range | 2.7 V to 5.5 V |
| Input Offset Voltage | 65 µV (typical) |
| Input Bias Current | 1 pA (typical) |
| Input Voltage Noise Density | 7 nV/√Hz (typical) |
| Gain Bandwidth Product | 10 MHz (typical) |
| Slew Rate | 5 V/µs (typical) |
| Quiescent Current | 1.3 mA (typical) |
| Rail-to-Rail Input | Yes |
| Rail-to-Rail Output | Yes |
| Output Current | 50 mA (typical) |
| Operating Temperature Range | -40°C to +125°C |
| Package | 8-Lead SOIC (N) |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
AD8605ARZ-REEL7 Pin Configuration
| Pin 1 | OUT — Output |
| Pin 2 | -IN — Inverting input |
| Pin 3 | +IN — Non-inverting input |
| Pin 4 | V- — Negative supply (ground in single-supply) |
| Pin 5 | NC — No connect |
| Pin 6 | NC — No connect |
| Pin 7 | NC — No connect |
| Pin 8 | V+ — Positive supply |
Typical Applications
AD8605ARZ-REEL7 is suitable for 6 applications: Photodiode Amplifier, Battery-Powered Instrumentation, Active Filters, Portable Medical Devices, Audio Preamplifier, Sensor Signal Conditioning.
Photodiode Amplifier
The AD8605ARZ-REEL7 is ideal for photodiode amplification due to its low input bias current (1 pA) and low noise (7 nV/√Hz). In a transimpedance amplifier configuration, the op amp converts the photodiode current to a voltage with high precision. The rail-to-rail output allows direct interfacing with ADCs. The low offset voltage ensures accurate signal detection even at low light levels. The wide bandwidth of 10 MHz supports high-speed optical communication systems.
Recommended
Battery-Powered Instrumentation
The AD8605ARZ-REEL7 operates from 2.7V to 5.5V, making it suitable for battery-powered instruments. Its low quiescent current of 1.3 mA extends battery life. The rail-to-rail input and output maximize dynamic range in low-voltage systems. The low offset and noise ensure accurate measurements in portable data acquisition systems. The op amp can be used in signal conditioning for sensors such as temperature and pressure sensors.
Recommended
Active Filters
The AD8605ARZ-REEL7 is well-suited for active filter designs due to its wide bandwidth (10 MHz) and low noise. It can be used in low-pass, high-pass, and band-pass filters for audio and communication systems. The rail-to-rail output allows the filter to drive ADCs directly. The low offset voltage minimizes DC errors in the filter response. The op amp's stability with capacitive loads makes it easy to implement in various filter topologies.
Recommended
Portable Medical Devices
The AD8605ARZ-REEL7 is suitable for portable medical devices such as glucose monitors and pulse oximeters. Its low power consumption and low noise are critical for battery-operated medical equipment. The rail-to-rail operation allows direct interfacing with low-voltage ADCs. The high precision ensures accurate readings in diagnostic applications. The op amp's small SOIC-8 package is ideal for compact medical devices.
Recommended
Audio Preamplifier
The AD8605ARZ-REEL7 can be used as an audio preamplifier due to its low noise (7 nV/√Hz) and wide bandwidth (10 MHz). It provides clean amplification for microphones and other audio sources. The rail-to-rail output allows it to drive headphone amplifiers directly. The low distortion and high slew rate ensure faithful reproduction of audio signals. The op amp's low power consumption is beneficial for portable audio devices.
Recommended
Sensor Signal Conditioning
The AD8605ARZ-REEL7 is ideal for sensor signal conditioning due to its low offset voltage and low noise. It can amplify small signals from sensors such as thermocouples, strain gauges, and RTDs. The rail-to-rail input allows it to handle signals near the supply rails. The low input bias current minimizes errors in high-impedance sensor circuits. The op amp's wide bandwidth supports dynamic sensor measurements.
Recommended
Recommended Products Summary
Engineering reference data for AD8605ARZ-REEL7 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | AD8605ARZ | AD8605ARTZ-REEL7 | OPA376AIDR |
|---|---|---|---|---|
| Package | 8-Lead SOIC (N) | 8-Lead SOIC (N) | 5-Lead SOT-23 | 8-Lead SOIC (N) |
| Brand | Analog Devices | Analog Devices | Analog Devices | Texas Instruments |
| Supply Voltage Range | 2.7V to 5.5V | 2.7V to 5.5V | 2.7V to 5.5V | 2.2V to 5.5V |
| Input Offset Voltage | 65 µV (typical) | 65 µV (typical) | 65 µV (typical) | 25 µV (typical) |
| Input Bias Current | 1 pA (typical) | 1 pA (typical) | 1 pA (typical) | 0.2 pA (typical) |
| Gain Bandwidth Product | 10 MHz | 10 MHz | 10 MHz | 5.5 MHz |
| Quiescent Current | 1.3 mA (typical) | 1.3 mA (typical) | 1.3 mA (typical) | 0.95 mA (typical) |
| Rail-to-Rail | Yes | Yes | Yes | Yes |
Key Differentiators
- Low input bias current of 1 pA (vs OPA376AIDR)
- Wide bandwidth of 10 MHz (vs OPA376AIDR)
- DigiTrim technology for low offset (vs MCP6V11-E/SN)
Design Notes
The AD8605ARZ-REEL7 operates from 2.7V to 5.5V. For optimal performance, use a clean power supply with adequate decoupling. Place a 0.1 µF ceramic capacitor close to the V+ pin and a 10 µF tantalum capacitor for lower frequency decoupling. In single-supply applications, ensure the ground connection is solid to avoid noise.
For best noise performance, keep the input traces short and shielded. Use a ground plane to minimize noise pickup. Place the feedback resistor and capacitor close to the inverting input to reduce parasitic capacitance. Avoid routing high-speed digital traces near the input pins.
Do not exceed the absolute maximum supply voltage of 6V. Ensure the input voltages do not exceed the supply rails by more than 0.3V to avoid latch-up. The output can drive capacitive loads up to 100 pF without oscillation, but for larger loads, add a series resistor to isolate the output.
Compliance Information
RoHS compliant per Analog Devices product page. Not AEC-Q100 qualified.
