The MAX4578/MAX4579 are high-voltage, 8-channel CMOS multiplexers. The MAX4578 and dual 4-channel MAX4579 are ideal for precision ADC calibration and system self-monitoring applications. These calibration multiplexers (cal-muxes) have precision resistor- dividers to generate accurate voltage ratios from an input reference voltage. The reference ratios include 15/4096 and 4081/4096 of the external reference voltage, accurate to 15 bits, and 1/2(V+) and 5/8(V+ - V-), accurate to 8 bits. The external reference voltage as well as ground can also be switched to the output. The MAX4578/MAX4579 have enable inputs and address latching. All digital inputs have 0.8V and 2.4V logic thresholds, ensuring both TTL- and CMOS-logic compatibility when using a single +12V or dual ±15V supplies. Protection diodes at all inputs provide >2kV ESD rating. The MAX4578/MAX4579 operate from a single +4.5V to +36V supply or from dual supplies of ±4.5V to ±20V. On-resistance (350Ω max) is matched between switches to 15Ω max. Each switch can handle Rail-to-Rail® analog signals. The off-leakage current is 20pA at TA = +25°C and 1.25nA at TA = +85°C. The MAX4578/MAX4579 are available in small 20-pin SSOP, SO, and DIP packages.
The MAX4578 and MAX4579 are high‑voltage, 8‑channel (MAX4578) and dual 4‑channel (MAX4579) CMOS calibration multiplexers designed for precision ADC calibration and system self‑monitoring. They include on‑chip gain and offset divider networks that generate accurate voltage ratios and support rail‑to‑rail analog signals.
Key specifications include a supply voltage range of +4.5 V to +36 V (single) or +4.5 V to +20 V (dual), a maximum on‑resistance of 3.5 kΩ, guaranteed 20 pA off‑leakage current, and logic input thresholds of 2.4 V (high) and 0.8 V (low). Ordering information lists multiple package options such as 20‑pin SSOP, SO, and DIP.
| Supply Voltage Range | +4.5 V to +36 V (single) or +4.5 V to +20 V (dual) |
|---|---|
| On‑Resistance (max) | 3.5 kΩ |
| Off‑Leakage Current (max) | 20 pA |
| Logic Input High Voltage (VIH) | 2.4 V |
They operate from a single +4.5 V to +36 V supply or from dual supplies of +4.5 V to +20 V.
The devices guarantee an off‑leakage current of 20 pA.
Logic high is specified at 2.4 V and logic low at 0.8 V.
The maximum on‑resistance is 3.5 kΩ.