AN3959 datasheet(6/65 Pages) STMICROELECTRONICS

6 / 65 page

Functional description of the demonstration board

AN3959

6/65

Doc ID 022081 Rev 3

Functional description of the demonstration board

The following terms used in this application note are defined as follows:

●

THD+N vs. Freq: Total harmonic distortion (THD) plus noise versus frequency curve

●

THD+N vs. Pout: Total harmonic distortion (THD) plus noise versus output power

●

S/N ratio: Signal-to-noise ratio

●

FFT: Fast Fourier Transform algorithm (method)

●

CT: Channel separation L to R, or R to L channel crosstalk

The equipment used includes the following:

●

Audio Precision (System 2700) by AP Co., USA

●

DC power supply (4.5 V to 25.5 V operating range)

●

Digital oscilloscope (TDS3034B by Tektronix)

●

MS Windows-based PC with APWorkbench GUI control software installed. For the

APWorkbench software setup, please refer to the APW UserManualR1.0.pdf

Reference documents include:

●

STA381BW and STA381BWS datasheets

●

Demonstration board schematic, PCB layout and test curves

1.1

Connections

Power supply and interface connection

Connect the positive voltage of the 18 V DC power supply to the +VS pin and negative

to GND (note that the operating voltage range of the DC power supply is from 4.5 V to

25.5 V).

Connect the APWLink board to the J1 connector of the STA380BWS demonstration

board.

Connect the S/PDIF signal cable to the RCA jack on the APWLink board, the other side

connects to the signal source such as Audio Precision or a DVD player.

1.2

Output configuration

The STA381BW/STA381BWS demonstration board is specifically configured in 2 BTL

channels.

AN3959 Datasheet(PDF) 6 Page - STMicroelectronics

AN3959 Datasheet(HTML) 6 Page - STMicroelectronics

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65

Datasheet Download

Link URL