The ADG438F and ADG439F are CMOS analog multiplexers, with the ADG438F comprising eight single channels and the ADG439F comprising four differential channels. These multiplexers provide fault protection. Using a series n-channel, p-channel, and n-channel MOSFETs, these switches provide fault protection over all power supply voltages (-40 V to +55 V). The switching times (tON and tOFF) are extremely fast, being 250 ns and 150 ns respectively. The ADG438F and ADG439F are high-performance, high-reliability, low-power switches.
The ADG438F and ADG439F are high‑performance analog multiplexers that provide fault and over‑voltage protection. The ADG438F offers eight single‑ended channels, while the ADG439F provides four differential channels. Both devices use a series n‑channel, p‑channel, and n‑channel MOSFET structure to protect the device and signal source during over‑voltage or power‑loss events.
Key features include fast switching (tON 250 ns, tOFF 150 ns), break‑before‑make operation, low on‑resistance (270 Ω typical), and a wide operating temperature range (‑40 °C to +125 °C). The devices are TTL‑ and CMOS‑compatible and are suited for data‑acquisition, industrial control, avionics test equipment, and high‑reliability signal routing applications.
| Analog output open‑circuit voltage | VDD − 1.4 V (typ) |
|---|---|
| On‑Resistance (RON) | 270 Ω (typ) |
| Source Off Leakage Current (I_S(off)) | ±0.01 nA (typ) |
| Fault Source Leakage Current (I_S(fault)) | ±0.02 nA (typ) |
| Operating Temperature Range | ‑40 °C to +125 °C |
| Supply Voltage Range (VDD to VSS) | 48 V |
They can withstand continuous over‑voltage inputs from –40 V to +55 V.
The ADG438F comprises eight single‑ended channels.
The typical on‑resistance is 270 Ω.
When the EN input is low, the device is disabled and all switches are off.