The AD8648ARUZ-REEL is a dual-channel CMOS precision operational amplifier launched by Analog Devices (ADI). It adopts a rail-to-rail output structure and features ultra-low bias current (<1pA), low input offset voltage and ultra-low power consumption. This chip is highly suitable for processing high-impedance signal sources, such as photodiodes, ion detectors, Hall sensors, etc. Its package is TSSOP-8 (small form factor and thin package), which is suitable for high-density PCB layout design and is a common choice in high-precision analog front-end (AFE) design.
Main technical parameters
Parameter value
Number of channels 2 (dual channels) Operating voltage range: 2.2V to 5.5V (single power supply) or ±1.1V to ±2.75V (dual power supply)
The maximum input bias current is 1 pA
The maximum input offset voltage is ±0.75 mV
Gain-bandwidth product (GBW) 2.2 MHz (typical)
Offset voltage drift: 2 μV/°C (typical)
Static current: 45 μA/ channel (typical)
Output type: rail-to-rail output
Packaging form: TSSOP-8 (AD8648ARUZ)
Operating temperature range: -40°C to +125°C
Product Features
✅ Ultra-low input bias current (<1pA)
✅ High input impedance, suitable for high impedance sources
✅ Ultra-low power consumption, ideal for battery-powered systems
✅ rail-to-rail output for simplified amplification link design
✅ Excellent temperature drift control, suitable for precision measurement
✅ Two-channel integration to save PCB space
Typical application fields
🔬 Electrochemical sensor interface: such as PH, conductivity detection
🔋 Battery-powered measurement system: portable device, data acquisition terminal
📡 Photoelectric sensor signal processing: phototube, photoresistor
🔧 Hall sensors and magnetic field measurement: magnetic position sensing circuits
🏭 Industrial process control systems: high impedance detection and precision measurement front end
🧪 Medical analytical equipment: potential measurement, low current sensing
Pin Description (TSSOP-8 package)
Pin number name description
1 OUT A channel A output
2-IN channel A inverting input
3 +IN channel A: In-phase input
4 V- Negative power supply/ground
5 +IN channel B: In-phase input
6-IN Channel B inverting input
7 OUT Channel B output
8 V+ positive power supply
Compatibility and equivalent model recommendations
Model, brand, feature comparison, and packaging
AD8628/29/30 ADI higher precision, low-power version MSOP/SOIC
OPA2333 TI features zero drift and low power consumption MSOP-8
MCP6022 Microchip's more economical alternative, rail-to-rail output SOIC-8
LMC6482 TI CMOS input, extremely high input impedance DIP/SOIC
LT1490A Analog Devices ±0.5nA bias, 2.5MHz GBW MSOP-8
Summary
The AD8648ARUZ-REEL, with its low input bias current, high input impedance, rail-to-rail output and extremely low power consumption, has become one of the preferred devices for designers in high-impedance sensing signal processing circuits. It is applicable to multiple key scenarios such as instruments and meters, portable medical care, and battery-powered systems. The ADI brand is reliable and has superior performance, and is widely praised by engineers.
