DAC8218是TI公司的一款精密DAC(=<10MSPS)产品，DAC8218是八路、低功耗、14 位 +/-16.5V 输出串行输入数模转换器，本页介绍了DAC8218的产品说明、应用、特性等，并给出了与DAC8218相关的TI元器件型号供参考。
DAC8218 - 八路、低功耗、14 位 +/-16.5V 输出串行输入数模转换器 - 精密DAC(=<10MSPS) - 数模转换器 - TI公司（Texas Instruments，德州仪器）
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 VMON 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
