AN3959 datasheet(24/65 Pages) STMICROELECTRONICS

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Analog section test results

AN3959

24/65

Doc ID 022081 Rev 3

Analog section test results

The line/headphone out can be fed either with an external analog source, or with the F3X

output, allowing the audio content to come from the digital interface on both the power

output and on the line/headphone out.

Table 2.

Test conditions

Conditions

Input

Output

J15, J16 short-circuit & SW2, SW3 switch to HPOUT

STA381BWS F3X

F3X HP OUT

J15, J16 short-circuit & SW2, SW3 switch to LINEOUT

STA381BWS F3X

LINE OUT

J15, J16 open circuit & SW2, SW3 switch to HPOUT

LINE IN

F3X HP OUT

J15, J16 open circuit & SW2, SW3 switch to LINEOUT

LINE IN

LINE OUT

Table 3.

Headphone section test results

Filter: 22K LPF

Ext. Res: 18K + 43K

Headphone

Unit

Spec.

Test results

Reference

mVrms

75 mVrms reference

Maximum output level

mVrms

540 mVrms(10 mW)

542 mV

548 mV

Left

Right

H/P frequency response

-3 dB

↑, +0.5 dB 30 Hz

~20 kHz

-0.4 ~ -0.28

Left

Right

H/P THD+N vs. frequency

dBr

-57

Left

Right

H/P THD+N vs. level

dBr

-57

Left

Right

H/P signal-to-noise (20-bit)

dBr

-60

Left

Right

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