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TI有没有5.5V的稳压芯片，给DAC的ref作参考源
提醒一句：给DAC的电压基准Reference 供电时，不是用普通的稳压芯片如LDO，应该用电压基准。后者的电压精度、稳定性、噪声等指标更好。
5.5V的电压基准可以通过电压基准+运放的方式实现，比如 OPA350 + EF5040
