ADC0808S125 View Datasheet(PDF) - NXP Semiconductors.

Part Name

Description

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ADC0808S125

Single 8-bit ADC, up to 125 MHz or 250 MHz

NXP Semiconductors. 

NXP Semiconductors

a1

ADC0808S125/250

Single 8-bit ADC, up to 125 MHz or 250 MHz

SFDR

s

a2

a3

ak

frequency

001aag627

a = harmonic.

s = single tone.

Fig 10. Single tone spectrum of full-scale input sine wave of frequency ft

Remark: Pnoise in the equations in the following sections, is the sum of noise sources

which include random noise, non-linearities, sampling time errors, and quantization noise.

12.2.1 Signal-to-Noise And Distortion (SINAD)

SINAD is the ratio of the output signal power to the noise plus distortion power for a given

sample rate and input frequency, excluding the DC component:

SINAD[dB] = 10log10P----n---o---i-s-P-e---s+--i--gd---ni-s-a-t--lo---r--t-i--o---n

(3)

12.2.2 Effective Number Of Bits (ENOB)

ENOB is derived from SINAD and gives the theoretical resolution required by an ideal

ADC to obtain the same SINAD measured on the real ADC. A good approximation gives:

ENOB = S----I--N-----A--6--D-.-0---2–-----1---.--7---6-

(4)

12.2.3 Total Harmonic Distortion (THD)

THD is the ratio of the power of the harmonics to the power of the fundamental. For k − 1

harmonics the THD is:

THD[dB]

=

10log



10 

P----h-P--a--s-r-i-m-g--no---an--l-i-c---s

(5)

where:

ADC0808S125_ADC0808S250_3

Product data sheet

Rev. 03 — 24 February 2009

© NXP B.V. 2009. All rights reserved.

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