DAC8218 - Octal, Low power ,14-bit, +/-16.5V Output Serial Input Digital-to-Analog Converter

The DAC8218 is a low-power, octal, 14-bit digital-to-analog converter (DAC). With a 5V reference, the output can either be a bipolar ±15V voltage when operating from dual ±15.5V (or higher) power supplies, or a unipolar 0V to +30V voltage when operating from a +30.5V (or higher) power supply. With a 5.5V reference, the output can either be a bipolar ±16.5V voltage when operating from dual ±17V (or higher) power supplies, or a unipolar 0V to +33V voltage when operating from a +33.5V (or higher) power supply. This DAC provides low-power operation, good linearity, and low glitch over the specified temperature range of –40°C to +105°C. This device is trimmed in manufacturing and has very low zero-code and gain error. In addition, system level calibration can be performed to achieve ±1 LSB bipolar zero/full-scale error with bipolar supplies, or ±1 LSB zero code/full-scale error with a unipolar supply, over the entire signal chain. The output range can be offset by using the DAC offset register.

The DAC8218 features a standard, high-speed serial peripheral interface (SPI) that operates at up to 50MHz and is 1.8V, 3V, and 5V logic compatible, to communicate with a DSP or microprocessor. The input data of the device are double-buffered. An asynchronous load input (LDAC) transfers data from the DAC data register to the DAC latch. The asynchronous CLR input sets the output of all eight DACs to AGND. The V_MON pin is a monitor output that connects to the individual analog outputs, the offset DAC, the reference buffer outputs, and two external inputs through a multiplexer (mux).

The DAC8218 is pin-to-pin and function-compatible with the DAC8718 (16-bit) and the DAC7718 (12-bit).

• Bipolar Output: ±2V to ±16.5V
• Unipolar Output: 0V to +33V
• 14-Bit Resolution
• Low Power: 14.4mW/Ch (Bipolar Supply)
• Relative Accuracy: 1 LSB Max
• Low Zero/Full-Scale Error
  • Before User Calibration: ±2.5 LSB Max
  • After User Calibration: ±1 LSB
• Flexible System Calibration
• Low Glitch: 4nV-s
• Settling Time: 15µs
• Channel Monitor Output
• Programmable Gain: x4/x6
• Programmable Offset
• SPI: Up to 50MHz, 1.8V/3V/5V Logic
• Schmitt Trigger Inputs
• Daisy-Chain with Sleep Mode Enhancement
• Packages: QFN-48 (7x7mm), TQFP-64 (10x10mm)
• APPLICATIONS
  • Automatic Test Equipment
  • PLC and Industrial Process Control
  • Communications