ADI AD5780 18位数模转换解决方案

ADI公司的AD5780是18位电压输出数模转换器(DAC),工作电压为双极电源,高达33V,正基准电压为5V到VDD-2.5V,负基准电压为VSS+2.5V到0V, 0°C到+125℃工作温度,低噪音为8 nV/√Hz,增益误差温度系数为±0.018 ppm/℃,主要用在医疗仪器,测试和测量,工业控制,科学和航空仪表,数据采集系统,数字增益和失调调整以及电源控制.本文介绍了AD5780主要特性和产品亮点, 方框图和典型应用电路,以及评估板EVAL-AD5780主要特性,方框图,电路图,材料清单和PCB布局图.
The AD5780 is a true 18-bit, unbuffered voltage output DAC that operates from a bipolar supply of up to 33 V. The AD5780 accepts a positive reference input range of 5 V to VDD − 2.5 V and a negative reference input range of VSS + 2.5 V to 0 V. Both reference inputs are buffered on chip and external buffers are not required. The AD5780 offers a relative accuracy specification of ±1 LSB maximum range, and operation is guaranteed monotonic with a ±1 LSB DNL maximum range specification.
The part uses a versatile 3-wire serial interface that operates at clock rates of up to 35 MHz and is compatible with standard SPI, QSPI™ MICROWIRE™ and DSP interface standards. The part incorporates a power-on reset circuit that ensures that the DAC output powers up to 0 V in a known output impedance state and remains in this state until a valid write to the device takes place. The part provides an output clamp feature that places the output in a defined load state.
AD5780产品亮点:
True 18-bit accuracy.
Wide power supply range of up to ±16.5 V.
−0℃ to +125℃ operating temperature range.
Low 8 nV/√Hz noise.
Low ±0.018 ppm/℃ gain error temperature coefficient.
AD5780主要特性:
True 18-bit voltage output DAC, ±1 LSB INL
8 nV/√Hz output noise spectral density
0.025 LSB long-term linearity error stability
±0.018 ppm/℃ gain error temperature coefficient
2.5 μs output voltage settling time
3.5 nV-sec midscale glitch impulse
Integrated precision reference buffers
Operating temperature range: ͨ...