TDA9910 datasheet(13/21 Pages) PHILIPS

13 / 21 page

9397 750 14418

Objective data sheet

Rev. 02 — 9 December 2004

13 of 21

Philips Semiconductors

TDA9910

12-bit, up to 80 Msample/s, Analog-to-Digital Converter (ADC)

where:

10.2 Dynamic parameters

Figure 7 shows the spectrum of a single tone full-scale input sine wave with frequency ft,

conforming to coherent sampling (ft/fs = M/N, with M number of cycles and N number of

samples, M and N being relatively prime), and digitized by the ADC under test.

Remark: In the following equations, Pnoise is the power of the terms which include the

effects of random noise, non-linearities, sampling time errors, and “quantization noise”.

10.2.1 SINAD (signal-to-noise and distortion)

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:

10.2.2 ENOB (effective number of bits)

It is derived from SINAD and gives the theoretical resolution an ideal ADC would require

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

10.2.3 THD (total harmonic distortion)

The ratio of the power of the harmonics to the power of the fundamental. For k

− 1

harmonics the THD is:

i0x 2

–

()

Fig 7.

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

SFDR

001aaa518

fs/2

measured output range (MHz)

magnitude

SINAD dB

[]

10log

signal

noise

distortion

----------------------------------------





ENOB

SINAD

1.76

–

6.02

----------------------------------

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