ADC1207S080_3

© IDT 2012. All rights reserved.

Product data sheet

Rev. 03 — 2 July 2012

13 of 20

Integrated Device Technology

ADC1207S080

Single 12 bits ADC, up to 80 MHz with direct/ultra high IF sampling

11. Definitions

11.1 Static parameters

11.1.1 Integral Non-Linearity (INL)

It is defined as the deviation of the transfer function from a best fit straight line (linear

regression computation). The INL of the code i is obtained from the equation:

INL i



Vi i

 V

i ideal



–

S

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

=

where: S corresponds to the slope of the ideal straight line (code width); i corresponds to

the code value; Vi is the input voltage.

11.1.2 Differential Non-Linearity (DNL)

It is the deviation in code width from the value of 1 LSB.

DNL i



Vi i1

+

 V

i i



–

S

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

=

where: Vi is the input voltage; i from 0 to (2n  2).

11.2 Dynamic parameters

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

conforming to coherent sampling (f/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.

a2

a1

magnitude

frequency

014aaa437

SFDR

ak

s

a3

Fig 7.

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