AD1986AJSTZ Analog Devices Inc, AD1986AJSTZ Datasheet - Page 51

• Manufacturer Part Number: AD1986AJSTZ
• Description: IC CODEC HD AUDIO AC'97 48LQFP
• Manufacturer: Analog Devices Inc
• Series: SoundMAX®r
• Type: Audio Codec '97, HDr

Specifications of AD1986AJSTZ

• Data Interface: Serial
• Resolution (bits): 20 b
• Number Of Adcs / Dacs: 2 / 6
• Sigma Delta: No
• Dynamic Range, Adcs / Dacs (db) Typ: 85 / 91
• Voltage - Supply, Analog: 4.5 V ~ 5.5 V
• Voltage - Supply, Digital: 2.97 V ~ 3.63 V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 48-LQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Register
G [4:0]
(Gain Bits
(Read/Write))
SENSE REGISTER (REGISTER 0x6A, PAGE 01)
This address represents multiple registers (one for each supported function code (FC [3:0] bits (0x66 D [04:01])). The ST [2:0] bits are
only reset by power-on. They are used by the BIOS to store configuration information (per AC ’97 Revision 2.3 specifications) and must
not be reset by soft, hard, or hardware resets. The remaining bits are the result of the last sense operation performed by the impedance
sensing circuitry.
Reg
0x6A1
Table 115.
Register
SR [5:0] (RO)
(Sense Result
Bits, RO)
OR [1:0] (RO)
(Order Bits)
S [4:0] (RO)
Name
Sense
Register
Function
The codec updates these bits with the gain value (dB relative to level-out) in 1.5 dBV increments, not including the volume
control gains. For example, if the volume gain is to 0 dB, then the output pin should be at the 0 dB level. Any difference in
the gain is reflected here. When relevant, the BIOS updates this bit to take into consideration external amplifiers or other
external logic that it knows about. G [3:0] indicates the magnitude of the gain. G [4] indicates whether the value is a gain or
attenuation—essentially it is a sign bit. These bits are only reset by a power-on reset because they are typically written by
the system BIOS and are not reset by codec hard or soft resets as long as power remains applied to the codec.
G4
0
0
1
x
These bits are used to report a vendor specific fingerprint or value (resistance, impedance, or
reactance). Used with the OR bits which are the multiplying factor.
These bits indicate the order the sense result bits SR [5:0] are using. For example, if measuring resistance SR = 1/OR =
11: the result is 1 kΩ.
OR [1:0]
00
01
10
11
Sensed bits meaning relates to the I/O being sensed as input or output. Read-only. Sensed bits (when output sense
cycle initiated). This field allows for the reporting of the type of output peripheral/device plugged in the jack. Values
specified below should be interrogated with the SR [5:0] and OR [1:0] for accurate reporting.
S [4:0]
0x00
0x01
0x02
0x03
0x04
0x05
0x06
0x07
0x08
Function
D15
ST2
G [3:0]
0000
0001
...
1111
0001
...
1111
Reserved
D14
ST1
D13
ST0
Order Value
10
10
10
10
Sense Value
Data not valid. Indicates that the reported value(s) is invalid
No connection. Indicates that there are no connected devices
Indicates a specific fingerprint value for devices that are not specified or are
unknown
Speakers (8 Ω)
Speakers (4 Ω)
Powered speakers
Stereo headphone
SPDIF out (electrical)
SPDIF out (TOS)
0
1
2
3
—SR bits indicate the actual impedance in ohms
—SSR bits indicate the impedance in ohms × 10
—SR bits indicate the impedance in ohms × 100
—SSR bits indicate the impedance in ohms × 1,000
D12
S4
D11
S3
D10
S2
Rev. 0 | Page 51 of 56
D9
S1
D8
S0
D7
OR1
D6
OR0
Gain/Attenuation (dB Relative to Level-Out)
0 dB
+1.5 dB
+1.5 dB × G [3:0]
+24.0 dB
−1.5 dB
−1.5 dB × G [3:0]
−24.0 dB
Default: 0
D5
SR5
SR4
D4
D3
SR3
D2
SR2
SR1
D1
D0
SR0
AD1986A
Default
Default: 0
Default
Default
Default
0xxxxx