Overview
The ADG438FBR, produced by Analog Devices Inc., is a high-performance, 8-channel, fault-protected analog multiplexer. This CMOS analog multiplexer is designed to switch one of eight inputs to a common output, controlled by 3-bit binary address lines (A0, A1, and A2). The device features an enable input (EN) that allows the multiplexer to be enabled or disabled, with all channels switched off when disabled.
The ADG438FBR is notable for its robust fault protection, using a series n-channel, p-channel, and n-channel MOSFET structure to protect both the device and the signal source from overvoltages and power loss. It can withstand continuous overvoltage inputs from −40 V to +55 V, ensuring high reliability in various applications.
Key Specifications
| Parameter | Typical Value | Maximum Value | Unit | Test Conditions/Comments |
|---|---|---|---|---|
| Analog Signal Range | VSS + 1.4 V to VDD - 1.4 V | VSS + 2.2 V to VDD - 2.2 V (output loaded, 1 mA) | V | Output open circuit and loaded conditions |
| On-Resistance (RON) | 270 Ω | 450 Ω | Ω | −10 V ≤ VS ≤ +10 V, IS = 1 mA |
| On-Resistance Flatness (RFLAT) | 9 % | 10 % | % | −10 V ≤ VS ≤ +10 V, IS = 1 mA |
| On-Resistance Drift | 0.6 %/°C | %/°C | VS = 0 V, IS = 1 mA | |
| On-Resistance Match Between Channels (ΔRON) | 3 Ω | Ω |
Key Features
- Fault Protection: The ADG438FBR can withstand continuous overvoltage inputs from −40 V to +55 V, protecting the device and signal sources during power loss or overvoltage conditions.
- Low On-Resistance (RON): Typically 270 Ω, ensuring minimal signal attenuation.
- Fast Switching Times: Enables rapid switching between channels.
- TTL- and CMOS-Compatible Inputs: Compatible with a wide range of digital control signals.
- Enable Input (EN): Allows the device to be enabled or disabled, with all channels switched off when disabled.
Applications
- Data Acquisition Systems: Ideal for multiplexing analog signals in data acquisition systems.
- Industrial and Process Control Systems: Used in control systems that require reliable and fault-tolerant signal routing.
- Avionics Test Equipment: Suitable for avionics applications due to its high reliability and fault protection features.
- Signal Routing Between Systems: Effective in routing signals between different systems while ensuring signal integrity.
- High Reliability Control Systems: Used in critical control systems where fault tolerance and reliability are paramount.
Q & A
- What is the primary function of the ADG438FBR?
The ADG438FBR is an 8-channel analog multiplexer that switches one of eight inputs to a common output based on 3-bit binary address lines.
- What kind of fault protection does the ADG438FBR offer?
The ADG438FBR can withstand continuous overvoltage inputs from −40 V to +55 V, protecting the device and signal sources during power loss or overvoltage conditions.
- What is the typical on-resistance (RON) of the ADG438FBR?
The typical on-resistance (RON) is 270 Ω.
- How does the enable input (EN) function on the ADG438FBR?
The enable input (EN) allows the device to be enabled or disabled, with all channels switched off when disabled.
- What are some common applications of the ADG438FBR?
Common applications include data acquisition systems, industrial and process control systems, avionics test equipment, signal routing between systems, and high reliability control systems.
- Is the ADG438FBR compatible with TTL and CMOS inputs?
- How many address lines does the ADG438FBR use to select channels?
The ADG438FBR uses 3-bit binary address lines (A0, A1, and A2) to select channels.
- What is the significance of the MOSFET structure in the ADG438FBR?
The series n-channel, p-channel, and n-channel MOSFET structure provides fault protection by limiting current during overvoltage conditions and protecting the device and signal sources.
- Can the ADG438FBR operate in a wide temperature range?
- What package options are available for the ADG438FBR?
The ADG438FBR is available in 16-Lead SOIC packages.
