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双极型电压输出DAC芯片选型

Other Parts Discussed in Thread: DAC8831, OPA277, OPA704, OPA727, REF3330

  最近在做一个项目 需要选一款具有双极性电压输出的DAC芯片,输出电压范围为-4V~+4V,用来产生占空比可调的锯齿波,后续电路不用增加运放,想请教一下有没有这种芯片。另外有人说DAC的输出阻抗较大,想得到较为理想的输出波形,后续电路仍需要增加运放,想请教一下是否真是这样。谢谢大家!