AD7864 Analog Devices, AD7864 Datasheet - Page 23

• Manufacturer Part Number: AD7864
• Description: High Speed, Low Power, 4-channel Simultaneous Sampling, 12-Bit ADC
• Manufacturer: Analog Devices

Specifications of AD7864

• Resolution (bits): 12bit
• # Chan: 4
• Sample Rate: 520kSPS
• Interface: Par
• Analog Input Type: SE-Bip,SE-Uni
• Ain Range: Bip 10V,Bip 2.5V,Bip 5.0V,Uni 2.5V,Uni 5.0V
• Adc Architecture: SAR
• Pkg Type: QFP

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