Datasheet

AD7864
Rev. D | Page 23 of 28
From Figure 22, the ENOB of the AD7864 at 1 MHz is
approximately 11 bits. This is equivalent to 68 dB SNR.
SNR
TOTAL
= SNR
JITTER
+ SNR
QUANT
= 68 dB
68 dB = SNR
JITTER
+ 72 dB (at 100 kHz)
SNR
JITTER
= 70.2 dB
From Equation 3
70.2 dB = 20 × log
10
[1/(2 × π × 1 MHz × σ)]
σ = 49 ps
where σ is the rms jitter of the AD7864.