The MAX548A/MAX549A/MAX550A are serial, 8-bit voltage-output digital-to-analog converters (DACs) that operate from a single +2.5V to +5.5V supply. Their ±1LSB TUE specification is guaranteed over temperature. Operating current (supply current plus reference current) is typically 75µA per DAC with VDD = 2.5V. In shutdown, the DAC is disconnected from the reference, reducing current drain to less than 1µA. The MAX548A/MAX549A allow each DAC to be shut down independently. The 10MHz, 3-wire serial interface is compatible with SPI™/QSPI™ and Microwire™ interface standards. Double-buffered inputs provide flexibility when updating the DACs; the input and DAC registers can be updated individually or simultaneously. The MAX548A is a dual DAC with an asynchronous load input; it uses VDD as the reference input. The MAX549A is a dual DAC with an external reference input. The MAX550A is a single DAC with an external reference input and an asynchronous load input. The MAX548A/MAX549A/MAX550A’s low power consumption and small µMAX and DIP packages make these devices ideal for portable and battery-powered applications.
The MAX548A, MAX549A and MAX550A are 8‑bit voltage‑output digital‑to‑analog converters (DACs) that operate from a single +2.5 V to +5.5 V supply. They feature ±1 LSB total unadjusted error, low operating current (typically 75 µA per DAC at VDD = 2.5 V) and a shutdown mode that reduces current drain to less than 1 µA. The MAX548A and MAX549A provide two DAC channels, while the MAX550A provides a single channel.
These devices use a 10 MHz, 3‑wire serial interface compatible with SPI/QSPI and Microwire standards. They are offered in 8‑pin DIP and µMAX packages, making them suitable for portable and battery‑powered applications such as VCXO control, comparator‑level settings, and digital gain/offset control.
| Supply Voltage Range | +2.5 V to +5.5 V |
|---|---|
| Typical Operating Current (VDD = 2.5 V) | 75 µA per DAC |
| Shutdown Current | < 1 µA |
| Serial Interface Speed | Up to 10 MHz |
| DAC Output Resistance | 33.3 kΩ |
They operate from a single +2.5 V to +5.5 V supply.
The shutdown current is less than 1 µA.
The MAX548A contains two independent DAC channels.
The serial interface can run up to 10 MHz.