Overview
The Microchip Technology MIC916BQS is a high-speed, low-power, voltage-feedback operational amplifier optimized for high-performance video and data acquisition systems. It belongs to the MIC916 family and offers high slew rate, wide bandwidth, and excellent drive capability. It is particularly well-suited for applications requiring precision analog signal conditioning with minimal distortion and delay, such as ADC buffers, active filters, cable drivers, and instrumentation amplifiers.
This device is implemented using BiCMOS technology to balance the benefits of bipolar (high-speed and low noise) and CMOS (low power) devices, providing excellent dynamic performance with low quiescent current consumption.
Key Features
* Ultra-high speed operation with large signal bandwidth
* Voltage feedback architecture
* Wide supply voltage range
* Output drive capability up to 50 mA
* Unity gain stable
* Very low differential gain and phase
* Surface-mount packaging for compact high-speed designs
Electrical Specifications
| Parameter | Value |
| -------------------------------------------- | ------------------------------------------------ |
| Gain Bandwidth Product (GBP) | 200 MHz (typical) |
| Slew Rate | 500 V/μs (typical) |
| Settling Time (0.1%) | 12 ns (typical) |
| Supply Voltage Range | ±2.5 V to ±5.5 V (or 5 V to 11 V single supply) |
| Input Offset Voltage | ±3 mV (typical), ±7 mV (max) |
| Input Bias Current | 2 μA (typical), 5 μA (max) |
| Quiescent Supply Current (per amplifier) | 5.5 mA (typical) |
| Input Voltage Noise Density | 4.5 nV/√Hz |
| Output Drive Capability | ±50 mA |
| Input Common-Mode Voltage Range | VEE + 1.3 V to VCC − 1.5 V |
| Common-Mode Rejection Ratio (CMRR) | 70 dB (typical) |
| Power Supply Rejection Ratio (PSRR) | 70 dB (typical) |
| Open Loop Gain | 90 dB (typical) |
Package and Pin Configuration
* Package Type: QSOP-8 (MIC916BQS)
* Pin Count: 8
* Mounting Type: Surface-mount (SMT)
* Thermal Resistance (θJA): ~150°C/W (typical, still-air condition)
* Moisture Sensitivity Level (MSL): Level 1
Dynamic Performance Characteristics
* Large Signal Bandwidth: Around 70 MHz at 2 Vpp output swing
* Small Signal Bandwidth: 200 MHz at unity gain
* Low Differential Gain: <0.05%
* Low Differential Phase: <0.05°
* These properties make it especially suitable for video signal integrity and analog front-end designs in instrumentation systems.
Functional Description
The MIC916BQS is built on a voltage feedback architecture, making it easier to configure in gain settings other than unity, unlike current feedback amplifiers that require careful compensation. It is unity-gain stable and can handle capacitive loads when compensated properly.
With its high slew rate and bandwidth, it excels in applications where the input signal contains fast transitions or high-frequency content. The low input offset and bias current ensure signal fidelity, even when amplifying small differential signals in data acquisition systems.
Typical Applications
* Video Line Drivers: Supports NTSC and PAL composite video with low distortion
* ADC Buffering: Provides wideband, low-distortion signal buffering for high-resolution analog-to-digital converters
* High-Speed Signal Conditioning: Filtering, scaling, and amplification of analog signals with minimal phase delay
* Cable Drivers: Drives long transmission lines in communication systems
* Pulse Amplifiers: High-speed response to narrow pulses in test equipment and radar
* Active Filters: Precision analog filtering in RF front ends and IF processing
Power Supply and Layout Considerations
* Requires well-bypassed power supply rails to minimize noise and maximize stability
* Use a ground plane and short signal traces to minimize parasitic inductance
* Place decoupling capacitors (e.g., 0.1 μF ceramic) close to the supply pins
* For maximum performance, layout should minimize loop area in feedback path and avoid stubs or impedance mismatches
Thermal and Reliability Considerations
* Maximum Operating Temperature Range: −40°C to +85°C (Industrial)
* Thermal Shutdown: Not integrated; proper heat dissipation must be designed at PCB level
* Long-Term Stability: Excellent due to precision BiCMOS fabrication
* Input ESD Protection: Integrated protection up to 2 kV HBM
Compliance and Environmental
* RoHS Compliant: Yes
* Halogen Free: Yes
* Lead-Free Soldering: Compatible with industry-standard reflow profiles
Conclusion
The Microchip MIC916BQS is a high-performance operational amplifier offering an exceptional combination of bandwidth, slew rate, drive capability, and low power consumption. Its small package and robust performance make it a go-to choice for engineers building analog front ends, video systems, or fast data acquisition circuits. The ability to operate with dual or single supplies increases its versatility across a wide range of professional and consumer-grade systems requiring high-speed analog processing.
