MAX9944ASA+T: High-Performance Dual Operational Amplifier | Rail-to-Rail Output
MAX9944ASA+T: Ultimate Guide to Analog Devices' Precision Dual Operational Amplifier
Product Overview
The MAX9944ASA+T represents Analog Devices/Maxim Integrated's commitment to high-performance analog solutions. This dual-channel operational amplifier combines precision, low-power operation, and rail-to-rail output in a compact 8-SOIC package. With its 2.4MHz gain bandwidth product and ultra-low 4nA input bias current, it's engineered for demanding applications across industrial, medical, and consumer markets.
Detailed Technical Specifications
Electrical Characteristics
- Supply Voltage Range: 6V to 38V (single or dual supply)
- Input Offset Voltage: 20 V (typ)
- Input Bias Current: 4nA (max)
- Quiescent Current: 550 A per channel
- Output Current: 20mA per channel
- Slew Rate: 0.35V/ s
Performance Metrics
- CMRR: 90dB (typical)
- PSRR: 100dB (typical)
- THD+N: 0.0005% at 1kHz
- Noise Density: 15nV/ Hz at 1kHz
Package Information
The device comes in an industry-standard 8-pin SOIC package (3.90mm width) with the following pin configuration:
- OUT A: Channel A Output
- IN- A: Channel A Inverting Input
- IN+ A: Channel A Non-Inverting Input
- V-: Negative Power Supply
- IN+ B: Channel B Non-Inverting Input
- IN- B: Channel B Inverting Input
- OUT B: Channel B Output
- V+: Positive Power Supply
Design Advantages
1. Rail-to-Rail Output Stage
The MAX9944ASA+T's output swings within 50mV of either rail, maximizing dynamic range in low-voltage applications. This makes it particularly suitable for battery-powered systems and single-supply designs.
2. Precision Performance
With 20 V input offset voltage and 4nA bias current, the amplifier maintains accuracy in high-impedance sensor interfaces and precision measurement circuits.
3. Power Efficiency
At just 550 A per channel, the device delivers exceptional power-performance ratio, enabling energy-sensitive applications without compromising signal integrity.
Application Circuits
1. Active Filter Design
The 2.4MHz bandwidth and stable operation make it ideal for:
- 2nd-order Sallen-Key low-pass filters
- Multiple feedback band-pass filters
- Anti-aliasing filters for data acquisition
2. Sensor Signal Conditioning
Typical implementations include:
- Bridge amplifier for strain gauges
- Photodiode transimpedance amplifier
- Thermocouple cold-junction compensation
Comparison with Competing Devices
| Parameter | MAX9944ASA+T | OPA2188 | LT1498 |
|---|---|---|---|
| Supply Range | 6-38V | 4.5-36V | 3-44V |
| GBW | 2.4MHz | 2MHz | 1.1MHz |
| IQ/Channel | 550 A | 500 A | 400 A |
| Price (1k) | $1.25 | $1.50 | $1.80 |
Reliability Information
The MAX9944ASA+T undergoes rigorous quality testing:
- 100% production testing at -40 C and +125 C
- ESD protection: 2kV HBM, 200V MM
- MTBF: >1 million hours at 85 C
- Qualified for automotive applications (AEC-Q100 pending)
Purchasing Information
Available through authorized distributors:
- MOQ: 100 pieces
- Lead Time: 4-6 weeks
- Packaging Options: Tape & Reel (2500 units), Cut Tape, Sample Quantities
Conclusion
The MAX9944ASA+T operational amplifier delivers an optimal balance of precision, power efficiency, and cost-effectiveness. Its robust design and versatile performance make it the go-to solution for engineers designing:
- Industrial process control systems
- Portable medical instrumentation
- Automotive sensor interfaces
- Consumer audio equipment
- Energy harvesting applications