Overview
The ADG438FBN, produced by Analog Devices Inc., is a high-performance, 8-channel, fault-protected analog multiplexer. This CMOS device is designed to provide robust protection against overvoltages and power loss, ensuring the integrity of both the multiplexer and the connected circuitry. The ADG438F switches one of eight inputs to a common output, controlled by 3-bit binary address lines (A0, A1, and A2). An enable input (EN) allows the device to be enabled or disabled, with all channels switched off when disabled.
Key Specifications
| Parameter | Typical Value | Maximum Value | Unit | Test Conditions |
|---|---|---|---|---|
| Analog Signal Range | VSS + 1.4 V to VDD - 1.4 V | VSS + 2.2 V to VDD - 2.2 V | V | Output loaded, 1 mA |
| 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 | |
| Switching Times (tON/tOFF) | 250 ns / 150 ns | ns | ||
| Input Voltage Range | −40 V to +55 V | V | Continuous overvoltage inputs |
Key Features
- Fault and Overvoltage Protection: The device can withstand continuous overvoltage inputs from −40 V to +55 V, protecting both the multiplexer and the signal sources during power loss or fault conditions.
- Low RON: The on-resistance is typically 270 Ω, ensuring minimal signal attenuation.
- Fast Switching Times: Switching times are as low as 250 ns for tON and 150 ns for tOFF.
- Latch-up Proof Construction: Ensures reliability and prevents latch-up conditions.
- TTL- and CMOS-Compatible Inputs: Compatible with both TTL and CMOS logic levels.
- Break-Before-Make Construction: Prevents signal shorting during switching.
Applications
- Data Acquisition Systems: Ideal for routing signals in data acquisition systems.
- Industrial and Process Control Systems: Used in industrial environments for reliable signal routing.
- Avionics Test Equipment: Suitable for avionics due to its high reliability and fault protection features.
- Signal Routing Between Systems: Effective for routing signals between different systems.
- High Reliability Control Systems: Used in systems requiring high reliability and robust fault protection.
Q & A
- What is the ADG438FBN used for? The ADG438FBN is an 8-channel fault-protected analog multiplexer used for routing signals in various applications, including data acquisition, industrial control, and avionics.
- How many channels does the ADG438FBN have? The ADG438FBN has eight single channels.
- What is the input voltage range of the ADG438FBN? The device can withstand continuous overvoltage inputs from −40 V to +55 V.
- What are the switching times of the ADG438FBN? The switching times are typically 250 ns for tON and 150 ns for tOFF.
- Is the ADG438FBN latch-up proof? Yes, the ADG438FBN has a latch-up proof construction.
- What are the typical applications of the ADG438FBN? The device is used in data acquisition systems, industrial and process control systems, avionics test equipment, signal routing between systems, and high reliability control systems.
- How is the ADG438FBN controlled? The ADG438FBN is controlled by 3-bit binary address lines (A0, A1, and A2) and an enable input (EN).
- What is the on-resistance of the ADG438FBN? The on-resistance is typically 270 Ω.
- Is the ADG438FBN compatible with TTL and CMOS logic levels? Yes, the ADG438FBN is compatible with both TTL and CMOS logic levels.
- What happens to the multiplexer during fault conditions with power supplies off? During fault conditions with power supplies off, the multiplexer input (or output) appears as an open circuit with only a few nanoamperes of leakage current flowing.
