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SLAAE47A May 2022 – August 2022 DAC11001A , DAC11001B

2.4 Noise Sources

At any given code, the DAC, reference buffer, and output buffer noise sources error due to the noise sources comprises of DAC, reference buffers and output buffer contribute to the total noise error. These errors comprises of both voltage and current noises from reference buffers and ouput buffer. Current noises from the operational amplifiers in the inverting and non-inverting stages manifests as voltage noise due to the presence of the resistors in the amplifier stages.

At code D_n, noise at the output of the buffer will be:

Equation 4.

V_{n} (n V / \sqrt{H z}) = \sqrt{{V_{n 0}}^{2} + (\frac{D_{n}}{2^{20}}) \times {V_{n 1}}^{2} + (1 - \frac{D_{n}}{2^{20}}) \times {V_{n 2}}^{2} + + {V_{n 3}}^{2}}

Where,

V_n = Total Noise at the output of the DAC

D_n = DAC Code

V_n0 = Noise from DAC

V_n1 = Output Noise from the non-inverting reference buffer

V_n2 = Output Noise from the inverting reference buffer

V_n3 = Noise from the output buffer

In Equation 4, V_n1, V_n2 and V_n3 includes both voltage and current noise.