STR720 datasheet(392/401 Pages) STMICROELECTRONICS

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STR720 - ELECTRICAL CHARACTERISTICS

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28.11.2 ADC performance

In the following sections the performance figures used to represent ADC characteristics are

reported in Table 107 and briefly explained in the subsequent sections.

VDD(all) = 1.80 V ± 10%, VDD3(all) = 3.30 V ± 10%, TA = -40 / +85 °C unless otherwise specified.

Full range 80 Hz sine wave input, FMOD = 2 MHz

Data based on design guidelines and validation, not tested in production.

Data based on design guidelines, not tested in production.

28.11.2.1 Signal to Noise ratio and distortion (SINAD)

The acquired samples are processed to calculate their FFT, after being windowed using a

four-term Blackman-Harris function so to avoid spread of the fundamental harmonic due to

the non-periodic captured components. On the FFT further processing is performed so to

calculate the ratio between the power of input sine wave fundamental component and the sum

of the noise power plus the power of all harmonic components except the fundamental. This

parameter can be also referred to as THD+N.

28.11.2.2 Effective number of bits (ENOB)

This paramer is calculated based upon the measured SINAD value, as the number of bits of

an ideal converter having an a signal-to-noise ratio equal to the SINAD of the real ADC under

measurement. The ideal signal-to-noise ratio can be expressed as:

thus the effective number of bits can be determined using the following formula:

Table 107. ADC Performance

Symbol

Parameter

Test Conditions(1), (2)

Value

Unit

Min.

Typ

Max

SINAD

Signal/Noise and distortion

ENOB

Effective number of bits

(Resolution)

11.5

bit

INL

Integral non-linearity(3)

Measured on 11 bit samples.

0.5

LSB

DNL

Differential non-linearity(3)

Measured on 11 bit samples.

0.5

LSB

THD

Total harmonic distortion

PBR

Pass-band ripple(4)

0.1

SNR

ideal

1.76

6.02 N

bits

⋅

ENOB

SINAD

1.76

–

6.02

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