16-/32- Channel, 3.5 з 1.8 V to 5.5 V, ?.5 V, Analog Multiplexers# ADG726BCP Technical Documentation
## 1. Application Scenarios
### Typical Use Cases
The ADG726BCP is a dual 16-channel analog multiplexer designed for precision signal routing applications. Typical use cases include:
Signal Routing Systems
- Test and Measurement Equipment : Automated test equipment (ATE) systems utilize the ADG726BCP for routing multiple sensor signals to a single measurement channel, significantly reducing system cost and complexity
- Data Acquisition Systems : Multi-channel data acquisition systems employ the device to sequentially sample multiple analog inputs through a single ADC, enabling high-channel-count systems with minimal component overhead
Communication Systems
- Telecom Switching : Used in base station equipment for antenna signal routing and channel selection
- Audio/Video Switching : Professional audio mixing consoles and video routing matrices leverage the low distortion characteristics for high-fidelity signal routing
### Industry Applications
Industrial Automation
- Process control systems use the ADG726BCP for monitoring multiple temperature, pressure, and flow sensors
- Factory automation equipment employs the multiplexer for multi-point monitoring and control signal distribution
- Advantage : High reliability and wide operating temperature range (-40°C to +85°C) suit harsh industrial environments
Medical Electronics
- Patient monitoring systems route multiple bio-potential signals (ECG, EEG, EMG) to processing circuits
- Diagnostic equipment uses the device for multi-channel signal conditioning paths
- Limitation : Not certified for direct patient-connected applications without additional isolation
Automotive Systems
- Battery management systems (BMS) monitor multiple cell voltages
- Advanced driver assistance systems (ADAS) route multiple sensor signals
- Advantage : Robust ESD protection (2kV HBM) ensures reliability in automotive environments
### Practical Advantages and Limitations
Advantages
- Low Power Consumption : Typical supply current of 1μA enables battery-operated applications
- High Integration : Dual 16:1 configuration reduces board space and component count
- Excellent Signal Integrity : Low on-resistance (120Ω typical) and flatness ensure minimal signal degradation
- Fast Switching : 150ns transition time supports high-speed multiplexing applications
Limitations
- Charge Injection : 10pC typical charge injection may affect precision sampling circuits
- Voltage Limitations : Absolute maximum rating of 7V restricts use in higher voltage systems
- Channel Crosstalk : -80dB at 1MHz requires careful layout for high-frequency applications
## 2. Design Considerations
### Common Design Pitfalls and Solutions
Power Supply Sequencing
- Pitfall : Applying analog signals before power supplies can forward-bias ESD protection diodes
- Solution : Implement proper power sequencing or add external protection diodes
Signal Level Management
- Pitfall : Exceeding maximum signal range (GND-0.3V to VDD+0.3V) causes latch-up or damage
- Solution : Use clamping diodes or series resistors for signals near supply rails
Thermal Management
- Pitfall : Continuous operation at maximum current can exceed junction temperature limits
- Solution : Ensure adequate PCB copper for heat dissipation in high-current applications
### Compatibility Issues with Other Components
ADC Interface Considerations
- Charge Bucket Effect : The multiplexer's capacitance (35pF typical) combined with ADC sampling capacitance creates charge sharing issues
- Mitigation : Add buffer amplifiers or increase acquisition time in sampling systems
Digital Logic Compatibility
- TTL/CMOS Interface : 3V logic compatible but requires level shifting for 1.8V systems
- Solution : Use level translators when interfacing with low-voltage processors
Power Supply Requirements
- Single/Dual Supply : Operates from ±2.5V to ±3.3V dual supplies or 2.7V to 5.5
