ADC0808S250HW/C1 View Datasheet(PDF) - NXP Semiconductors.

Part Name

Description

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ADC0808S250HW/C1

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

NXP Semiconductors. 

NXP Semiconductors

ADC0808S125/250

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

Pharmonics = a22 + a32 + … + ak2

(6)

Psignal = a12

(7)

The value of k is usually 6 (THD is calculated based on the first 5 harmonics).

12.2.4 Signal-to-Noise ratio (S/N)

S/N is the ratio of the output signal power to the noise power, excluding the harmonics and

the DC component:

S⁄N

=

10

l

o

g10





P-P---s-n--i-og---in-s-a-e--l

(8)

12.2.5 Spurious Free Dynamic Range (SFDR)

The SFDR value specifies the available signal range as the spectral distance between the

amplitude of the fundamental (a1) and the amplitude of the largest spurious harmonic and

non-harmonic (max (s)), excluding the DC component:

SFDR[dB] = 20log10m-----a--a--x-1--(--s---)

(9)

12.2.6 InterModulation Distortion (IMD)

f2 f1

2f1 − f2

2f2 − f1

f1 + f2

f1 + 2f2

2f1 + f2

f1 − f2

2f2 2f1

3f2 3f1

ADC0808S125_ADC0808S250_3

Product data sheet

frequency

001aag628

Fig 11. Spectrum of dual tone input sine wave of frequencies f1 and f2

The second-order and third-order intermodulation distortion products IMD2 and IMD3 are

defined using a dual tone input sinusoid, where f1 and f2 are chosen according to the

coherence criterion.

IMD is the ratio of the RMS value of either tone to the RMS value of the worst, second or

third-order intermodulation products.

Rev. 03 — 24 February 2009

© NXP B.V. 2009. All rights reserved.

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