TDA7590 datasheet(13/40 Pages) STMICROELECTRONICS

13 / 40 page

TDA7590

Key parameters

13/40

3.1.1

CODEC (ADC/DAC) Test Description

Reported typical values (table 3. - ADC and DAC sections) have been measured at Lab level

during product evaluation phase. General definitions and procedures are separately defined

in following dedicated paragraphs.

Total Harmonic Distortion with Noise to Signal (THD+N)/S

THD+N is defined as the ratio of the total power of the second power and higher harmonic

with noise components to the power of the fundamental for that signal. For THD+N

measurement, choose the DSP analyzer in Digital analyzer with THD ratio as measurement

option. Measure the THD+N value at -3dB amplitude of the input signal. First measure the

THD+N value at 1Vrms which is 0dB reference and then measure the value at -3dB

reference.

Dynamic Range (DR)

DR is defined as the level of THD+N measured when the input sine wave amplitude is so

small that no harmonics apart from the fundamental tone are present in the output signal.

This way THD+N becomes practically the ratio between the whole signal and noise floor,

being a different way to express SNR. As a convention, at which no harmonics should be

present in the output signal, it is fixed at -40dB of the full scale amplitude.

Crosstalk or Interchannel Isolation

A disturbance, caused by electromagnetic interference, along a circuit or a cable pair. An

electric signal disrupts another signal in an adjacent circuit and can cause it to become

confused and cross over each other. Crosstalk is measured by applying a signal -3dB

amplitude of input signal at one channel (A) and no signal at an other channel (B),

measuring the effect on this channel(B) because of the channel (A).

Total Harmonic Distortion to Signal (THD)/S

THD is defined as the ratio of the sum of only those components of the output signal which

are harmonic of system input, after having removed the fundamental tone corresponding to

the pure sine wave as input and the input signal.This measurement is done by using the

Harmonic analyzer which can isolate up to 15th harmonic components on the acquired

signal and report the sum of all of them, centering the fundamental tone on the frequency

provided by the input signalgenerator. These measurements are performed at -3dB

reference amplitude of input signal.

Dynamic Range

ICL

Interchannel Isolation

-100

DAC Differential

Vpp

Maximum Input Range at ADC1

2.8

THD/S

Total Harmonics Distortion to Signal

-58

(THD+N)/S

(THD + Noise) to Signal

-57

Dynamic Range

ICL

Interchannel Isolation

-85

Table 3.

Key parameters (continued)

Symbol

Parameter

Min.

Typ.

Max.

Unit

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