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參數資料
| 型號： | AD1981HD |
| 廠商： | Analog Devices, Inc. |
| 元件分類： | Codec |
| 英文描述： | HD Audio SoundMAX Codec |
| 中文描述： | 高清音頻SoundMAX編解碼器 |
| 文件頁數： | 15/16頁 |
| 文件大小： | 201K |
| 代理商： | AD1981HD |
AD1981HD
JACK PRESENCE DETECTION
HD AUDIO STYLE JACK PRESENCE DETECTION
The AD1981HD uses two jack sense lines for jack presence
detection. Combined with the peripheral enumeration engines,
this enables software to determine if there is a device plugged
into the circuit and what type of device it is. Software can also
reconfigure jacks and amplifiers as necessary, ensuring proper
audio operation and providing jack retasking.
Rev. 0 | Page 15 of 16
Jack presence is detected using a resistor tree arrangement
outlined in the HD audio specification. Up to four jacks can be
sensed on a single sense line by using different value resistors
for each jack between the sense line and ground (AV
SS
). Jacks
must normally have open, isolated switches to use this method
of jack presence detection.
Jack presence is reflected in the HD audio pin widget pin sense
verb. The MSB (Bit 31) indicates the current plugged state of the
connected jack. Jack change interrupts can be enabled using the
unsolicited response verb on each of these nodes. Each jack can
be set to generate a different value to provide event
identification within the software interrupt.
There are two methods to connect the codec to the jack
presence detection pins. In the first method, use a single
2.69 kΩ 1% resistor between the SENSE_A and SENSE_B lines,
but no capacitor. In the second method use a single 2.69 kΩ
resister between SENSE_A and AV
DD
and between SENSE_B
and AV
DD
. In the second method, the designer can add up to
1 μF of capacitance on each sense line. Designers should offer
both methods for maximum flexibility.
The specific resistor value for each jack is shown in Table 27.
Use 1% resistors for all jack presence detect circuitry to ensure
accurate detection.
CLASSIC JACK PRESENCE DETECTION
The AD1981HD GPIO pins can be used as classic jack sense
pins in JS_0- and JS_1-style operation (similar to AD1981B
operation). Only two jacks, typically line out and headphone
out, are supported in this configuration. The GPIO pins can be
connected to the left channel wrap-back switch on the jack via a
2.2 kΩ (typical) resistor. The left channel needs a 20 kΩ (typical)
resistor-to-analog ground to complete the circuit. This config-
uration allows autoconfiguration when other devices are plugged
in; for example, when headphones are plugged in, the external
speakers are disabled for private listening.
Table 27. Jack Sense Mapping
Resistor
(1% tolerance)
5.1 kΩ
10.0 kΩ
20.0 kΩ
39.2 kΩ
SENSE_A
SENSE_B
Name
Line Out
Line In
Front Microphone
Headphone Out
Port
D
C
B
A
HD Audio Node ID
0x05
0x09
0x08
0x06
Name
N/A
N/A
Rear Microphone
Aux In
Port
N/A
N/A
F
E
HD Audio Node ID
N/A
N/A
0x18
0x17
相關PDF資料 |
PDF描述 |
|---|---|
| AD1981HDJSTZ | HD Audio SoundMAX Codec |
| AD1981HDJSTZ-REEL | HD Audio SoundMAX Codec |
| AD1983 | HD Audio SoundMAX Codec |
| AD1983JCPZ | HD Audio SoundMAX Codec |
| AD1983JCPZ-REEL | HD Audio SoundMAX Codec |
相關代理商/技術參數 |
參數描述 |
|---|---|
| AD1981HDJSTZ | 制造商:Analog Devices 功能描述:Audio Codec 2ADC / 2DAC 20-Bit/24-Bit 48-Pin LQFP |
| AD1981HDJSTZ-REEL | 制造商:Analog Devices 功能描述:Audio Codec 2ADC / 2DAC 20-Bit/24-Bit 48-Pin LQFP T/R |
| AD1983 | 制造商:AD 制造商全稱:Analog Devices 功能描述:HD Audio SoundMAX Codec |
| AD1983JCPZ | 制造商:AD 制造商全稱:Analog Devices 功能描述:HD Audio SoundMAX Codec |
| AD1983JCPZ-REEL | 制造商:Rochester Electronics LLC 功能描述: 制造商:Analog Devices 功能描述: |
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