AD1981AJST Analog Devices Inc, AD1981AJST Datasheet - Page 14

• Manufacturer Part Number: AD1981AJST
• Description: IC CODEC STEREO MICPREAMP 48LQFP
• Manufacturer: Analog Devices Inc
• Series: SoundMAX®r
• Type: Audio Codec '97r

Specifications of AD1981AJST

• Data Interface: Serial
• Resolution (bits): 16, 20 b
• Number Of Adcs / Dacs: 4 / 2
• Sigma Delta: No
• Dynamic Range, Adcs / Dacs (db) Typ: 85 / 90
• Voltage - Supply, Analog: 4.65 V ~ 5.25 V
• Voltage - Supply, Digital: 3.15 V ~ 3.45 V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 48-LQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

AD1981A
NOTES
ADC
DAC
ANL
REF
PR[6:0]
EAPD
Reg Num Name
REG NAME
The ready bits are read only; writing to REF, ANL, DAC, ADC will have no effect. These bits indicate the status for the AD1981A subsections.
If the bit is a “1” then that subsection is “ready.” Ready is defined as the subsection able to perform in its nominal state.
The extended audio ID register identifies which extended audio features are supported. A non-zero extended audio ID value indicates one or
more of the extended audio features are supported.
28h
26h
Ext’d Audio ID
Power-Down Cntrl/Stat
ADC sections ready to transmit data
DAC sections ready to accept data
Analog amplifiers, attenuators, and mixers ready
Voltage references, V
CODEC Power-Down Modes. The first 3 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 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 (V
Analog Mixer Power-Down (V
AC-Link Interface Power-Down
Internal Clocks Disabled
ADC and DAC Power Down
V
Total Power-Down
Headphone Amp Power in Standby
REF
Standby Mode
D15 D14 D13 D12 D11
ID1 ID0
EAPD PR6 PR5 PR4 PR3 PR2 PR1 PR0 X
D15
REF
X
Power-Down Control/Status Register (Index 26h)
and V
D14 D13 D12 D11 D10 D9
Extended Audio ID Register (Index 28h)
X
REFOUT
REV1 REV0 AMAP X
REF
REF
and V
and V
up to nominal level
D10
REFOUT
REFOUT
D9
on)
off)
D8 D7 D6
X
D8 D7 D6 D5 D4 D3
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
X DSA1 DSA0 X SPDIF X VRA X605h
D5
X
X
D4
X REF ANL DAC ADC 000Xh
D3
D2
D2
D1
D1 D0 Default
D0 Default