TI DAC11001B低噪音超低谐波失真高压输出20位DAC解决方案

TI公司的DAC11001B是高度精确低噪音电压输出单端数模转换器(DAC),对所有输出范围提供极好的线性度.无缓冲的电压输出提供快速设定时间(1 μs)和低噪音性能(7 nV/√Hz),使得器件非常适合低噪音快速控制回路和波形产生的应用.DAC11001B集成了与代码无关的超低尖峰(1 nV-s)的增强抗尖峰电路,使得清晰波形具有超低的总谐波失真(THD) (–118 dB at 20-kHz fOUT, 1-MHz fDAC). DAC11001B采用多功能4线串行接口,工作时钟速率高达50MHz.工作温度–40°C 到 +125°C,采用48引脚TQFP封装.主要用在实验室和现场仪表,分光计,模拟输出模块,电池测试,半导体测试,任意波形发生器(AWG),MRI,X射线系统,专业音频放大器(机架型).本文介绍了DAC11001B主要特性, 功能框图和多种应用电路,以及评估模块BP-DAC11001 EVM主要特性,框图,电路图,材料清单和PCB设计图.

The 20-bit DAC11001B is a highly accurate, lownoise,voltage-output, single-channel, digital-to-analogconverter (DAC). The DAC11001B is specifiedmonotonic by design, and offers excellent linearityacross all output ranges.

The unbuffered voltage output offers low noiseperformance (7 nV/√Hz) in combination with a fastsettling time (1 μs), making this device an excellentchoice for low-noise, fast control-loop, and waveformgenerationapplications. The DAC11001B integratesan enhanced deglitch circuit with code-independentultra-low glitch (1 nV-s) to enable clean waveformramps with ultra-low total harmonic distortion (THD).

The DAC11001B device incorporates a power-onreset(POR) circuit so that the DAC powers onwith known values in the registers. With externalreferences, DAC output ranges from VREFPF to VREFNFcan be achieved, including asymmetric output ranges.

The DAC11001B uses a versatile 4–wire serialinterface that operates at clock rates of up to 50 MHz.

DAC11001B主要特性:

• 20-bit monotonic: 1-LSB DNL (max)

• Integral linearity: 1-LSB INL (max)

• Low noise: 7 nV/√Hz

• Code independent low glitch: 1 nV-s

• Excellent THD:

–118 dB at 20-kHz fOUT, 1-MHz fDAC

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