ANALOG MULTIPLEXERS-DEMULTIPLEXERS# Technical Documentation: HCC4053B Triple 2-Channel Analog Multiplexer/Demultiplexer
Manufacturer : STMicroelectronics
Document Revision : 1.0
Date : October 26, 2023
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## 1. Application Scenarios
### 1.1 Typical Use Cases
The HCC4053B is a monolithic integrated circuit fabricated in CMOS technology, providing a triple 2-channel analog multiplexer/demultiplexer with digital control. Its primary function is to route analog or digital signals from multiple inputs to a single output (multiplexing) or from a single input to multiple outputs (demultiplexing).
Key operational modes include:
- Signal Routing in Test Equipment : Selecting between multiple sensor inputs or signal sources for measurement by a single analog-to-digital converter (ADC).
- Audio Signal Switching : Routing left/right audio channels or selecting between different audio inputs in portable devices and mixers.
- Programmable Gain Amplifier (PGA) Configuration : Switching between different feedback resistors in op-amp circuits to alter gain settings.
- Data Acquisition Systems (DAQ) : Multiplexing multiple analog sensor signals (e.g., temperature, pressure, voltage) into a single ADC channel.
- Communication Systems : Channel selection in RF or baseband signal paths, or switching between modulation/demodulation paths.
### 1.2 Industry Applications
- Consumer Electronics : Used in audio/video switches, smart home controllers, and portable multimedia devices for input selection.
- Industrial Automation : Employed in PLCs (Programmable Logic Controllers) and process control systems to monitor multiple analog process variables (4-20mA loops, thermocouples).
- Automotive Electronics : Signal routing in infotainment systems, climate control modules, and basic sensor multiplexing in body control modules (note: not typically for safety-critical systems).
- Medical Devices : Low-frequency signal switching in patient monitoring equipment (e.g., selecting lead inputs for ECG).
- Telecommunications : Channel selection in legacy switching equipment and test fixtures.
### 1.3 Practical Advantages and Limitations
Advantages:
- Low Power Consumption : Typical \( I_{CC} \) of 1µA at 25°C with 5V supply, ideal for battery-powered devices.
- Wide Analog Voltage Range : Can handle analog signals from \( V_{EE} \) to \( V_{DD} \). With \( V_{EE} = -5V \) and \( V_{DD} = +5V \), it accommodates ±5V signals.
- High Noise Immunity : CMOS technology provides typical noise margin of 1V at \( V_{DD} = 5V \).
- Break-Before-Make Switching : Prevents momentary shorting during channel transitions.
- Digital Control Compatibility : Directly interfaces with 5V CMOS/TTL logic levels.
Limitations:
- Bandwidth Limitation : Typical -3dB bandwidth of 40MHz at \( V_{DD}-V_{EE} = 10V \), unsuitable for high-frequency RF applications (>50MHz).
- On-Resistance Variation : \( R_{ON} \) typically 125Ω at \( V_{DD}-V_{EE}=10V \), but varies with signal voltage and temperature, causing gain errors in precision circuits.
- Charge Injection : Up to 10pC of charge injection during switching can cause voltage glitches in high-impedance circuits.
- Limited Current Handling : Maximum continuous current through a switch is 10mA; not suitable for power switching.
- Voltage Constraints : Absolute maximum supply voltage (\( V_{DD}-V_{EE} \)) is 20V; analog input voltages must remain within \( V_{EE}-0.5V \) to \( V_{DD}+
