MAX522CPA+

The MAX522 contains two 8-bit, voltage-output digital-to-analog converters (DACs). The DACs are “inverted” R-2R ladder networks using complementary switches that convert 8-bit digital inputs into equivalent analog output voltages in proportion to the applied reference voltage. The MAX522 has one reference input which is shared by DAC A and DAC B. The device includes output buffer amplifiers for both DACs and input logic for simple microprocessor (μP) and CMOS interfaces. The power-supply range is from +5.5V down to +2.7V.

Applications

• Digital Gain and Offset Adjustment
• Programmable Current Source
• Programmable Voltage Source
• Power-Amp Bias Control
• VCO Tuning

Key features

• The MAX522 contains two 8-bit, buffered, voltage-output digital-to-analog converters (DAC A and DAC B) in small 8-pin SO and DIP packages.
• DAC A’s buffer can source and sink 5mA, and DAC B’s output can source and sink 500μA, both to within 0.5V of ground and VDD.
• The MAX522 operates with a single +2.7V to +5.5V supply.
• The device utilizes a 3-wire serial interface, which operates at clock rates up to 5MHz and is compatible with SPI, QSPI, and Microwire interface standards.
• The serial input shift register is 16 bits long and consists of eight bits of DAC input data and eight bits for DAC selection and shutdown control.
• DAC registers can be loaded independently or in parallel at the positive edge of CS.
• The MAX522’s ultra-low power consumption and small 8-pin SO package make it ideal for portable and battery-powered applications.
• Supply current is less than 1mA and drops below 1μA in shutdown mode.
• In addition, the reference input is disconnected from the REF pin during shutdown, further reducing the system’s total power consumption.
• The software format is compatible with the MAX512/MAX513 triple 8-bit DACs.
• Operates from a Single +2.7V to +5.5V Supply
• Dual Buffered Voltage Output
• Low Power Consumption: 1mA Operating Current < 1μA Shutdown Current
• Independently Programmable Shutdown Mode
• 5MHz, 3-Wire Serial Interface
• SPI, QSPI, and Microwire Compatible
• Space-Saving 8-Pin SO Package