MAXIM MAX548AEUA-T

The MAX548A/MAX549A/MAX550A are 8-bit, voltage-output digital-to-analog converters (DACs). The MAX548A/MAX549A are dual DACs, and the MAX550A is a single DAC. Each DAC consists of an R-2R ladder network that converts 8-bit digital inputs into equivalent analog output voltages in proportion to the applied reference voltage. The DACs feature double-buffered inputs and unbuffered outputs. The MAX549A/MAX550A require an external reference. The MAX548A's reference inputs are internally connected to VDD. The power-supply range is from +2.5V to +5.5V. The voltage applied at REF (VDD for the MAX548A) sets the full-scale output for all the DACs and may range from +2.5V to VDD. The REF input resistance is code dependent, with the lowest value occurring with code 01010101 (55 hex). To minimize INL errors, the reference voltage source should have less than 3Ω output impedance. The MAX548A/MAX549A/MAX550A contain DACs with unbuffered outputs; each output connects directly to an R-2R ladder. Typical output impedance is 33.3kΩ. This configuration minimizes power consumption and reduces offset errors. For highest accuracy, a

• The MAX548A/MAX549A/MAX550A serial, 8-bit voltage-output digital-to-analog converters (DACs) 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 SPITM/QSPITM and MicrowireTM 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.
• +2.5V to +5.5V Single-Supply Operation
• ±1LSB (max) TUE
• Power-On Reset Clears All Registers to Zero
• Low Operating Current: 150μA (MAX548A/MAX549A, VREF = +2.5V), 75μA (MAX550A, VREF = +2.5V)
• 1μA Shutdown Mode
• 10MHz, 3-Wire Serial Interface Compatible with SPI/QSPI and Microwire
• μMAX Package - 50% Smaller than 8-Pin SO
• Independent Shutdown of DACs (MAX548A/MAX549A)

• Battery-Powered Systems
• VCxO Control
• Comparator-Level Settings
• GaAs Amp Bias Control
• Digital Gain and Offset Control