ALC202 데이터 시트보기 (PDF) - Unspecified

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ALC202

AC97 Audio CODEC

Unspecified 

Avance Logic, Inc.

ALC202

6.2.8 AC-Link IO Pin Capacitance and Loading:

Output Pin

1 Codec 2 Codec

BIT_CLK (must support ³ 2 Codecs) 55pF 62.5pF

SDATA_IN

47.5pF 55pF

3 Codec

75pF

60pF

4 Codec

85pF

62.5pF

6.2.9

SPDIF output:

SPDIF_OUT

Rise time/fall time

Duty cycle

Min

Typ

Max

Unit

0

10

%

45

55

%

Note :

T(h)

T(l)

90%

50%

10%

T(r)

T(f)

Rise time = 100 * T(r)/ (T(l)+ T(h)) %

Fall time = 100 * T(f)/ (T(l)+ T(h)) %

Duty cycle = 100 * T(h)/ (T(l)+ T(h)) %

6.2.10 BIT-CLK and SDATA-IN state when RESET# is active:

When RESET# is active the BIT-CLK and SDATA-IN must be floating by internal pull low 100K

resistors. So the ac-link signals are driven by another AC’97 on CNR board. This requirement is not

mentioned in AC’97 specification rev2.1, please refer CNR (Communication Network Riser)

specification rev1.0 page23~25 to get detail information.

7. Analog Performance Characteristics

Standard test conditions: Tambient=250C, Dvdd=3.3V ±5%,Avdd=5.0V±5%

1KHz input sine wave; Sampling frequency=48KHz; 0dB=1Vrms

10KW/50pF load; Test bench Characterization BW: 10Hz~22KHz

0dB attenuation; tone and 3D disabled

Parameter

Min

Typ

Max

Units

Full scale input voltage

Line inputs (Mixers)

-

1.6

-

Vrms

Line inputs (A/D)

-

1.2

-

Mic input (0 dB)

-

1.6

-

Mic input (20 dB boost)

-

0.16

-

Full scale output voltage

LINE-OUT

-

1.0

1.50

Vrms

HEADPHONE-OUT

-

1.7

-

Vrms

- 26 -

Rev0.62

http://www.realtek.com.tw

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