AD1981BJST-REEL 데이터 시트보기 (PDF) - Analog Devices

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AD1981BJST-REEL

AC ’97 SoundMAX® Codec

Analog Devices 

AD1981B

Power-Down Control/Status Register (Index 26h)

Reg

No. Name

D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 Default

26h Power-Down Ctrl/Stat EAPD PR6 PR5 PR4 PR3 PR2 PR1 PR0 X X X X REF ANL DAC ADC 000Xh

The ready bits are read-only; writing to REF, ANL, DAC, ADC will have no effect. These bits indicate the status for the AD1981B subsections. If the bit is a 1, that

subsection is ready. Ready is defined as the subsection able to perform in its nominal state. All registers not shown and bits containing an X are assumed to be reserved.

ADC

DAC

ANL

REF

PR [6:0]

EAPD

ADC Sections Ready to Transmit Data.

DAC Sections Ready to Accept Data.

Analog Amplifiers, Attenuators, and Mixers Ready.

Voltage References, VREF, and VREFOUT up to Nominal Level.

Codec Power-Down Modes. The first three bits are to be used individually rather than in combination with each

other. PR3 can be used in combination with PR2 or by itself. The mixer and reference cannot be powered down via

PR3 unless the ADCs and DACs are also powered down.

Nothing else can be powered up until the reference is up. PR5 has no effect unless all ADCs, DACs, and the ac-link

are powered down. The reference and the mixer can be either up or down, but all power-up sequences must be

allowed to run to completion before PR5 and PR4 are both set.

In multiple codec systems, the master codec’s PR5 and PR4 bits control the slave codec. PR5 is also effective in the

slave codec if the master’s PR5 bit is clear, but the PR4 bit has no effect except to enable or disable PR5.

External Audio Power-Down Control. Controls the state of the EAPD pin.

EAPD = 0 sets the EAPD pin low, enabling an external power amplifier (reset default).

EAPD = 1 sets the EAPD pin high, shutting the external power amplifier off.

Power-Down State

ADCs and Input Mux Power-Down

DACs Power-Down

Analog Mixer Power-Down (VREF and VREFOUT On)

Analog Mixer Power-Down (VREF and VREFOUT Off)

AC-Link Interface Power-Down

Internal Clocks Disabled

ADC and DAC Power-Down

VREF Standby Mode

Total Power-Down

Headphone Amp Power-In Standby

Set Bits

PR0

PR1

PR1, PR2

PR0, PR1, PR3

PR4

PR0, PR1, PR4, PR5

PR0, PR1

PR0, PR1, PR2, PR4, PR5

PR0, PR1, PR2, PR3, PR4, PR5, PR6

PR6

PR [6:0]

[000 0001]

[000 0010]

[000 0101]

[000 1011]

[001 000]

[011 0011]

[000 0011]

[011 0111]

[111 1111]

[100 0000]

Extended Audio ID Register (Index 28h)

Reg

No. Name

D15 D14 D13 D12 D11 D10 D9

D8 D7 D6 D5 D4 D3 D2 D1 D0 Default

28h Ext’d Audio ID IDC1 IDC0 X X REVC1 REVC0 AMAP X X X DSA1 DSA0 X SPDIF X VRAS X605h

The Extended Audio ID Register identifies which extended audio features are supported. A nonzero Extended Audio ID value indicates that one or more of the

extended audio features are supported. All registers not shown and bits containing an X are assumed to be reserved.

REV. B

–17–

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