AD1981HDJSTZ Analog Devices Inc, AD1981HDJSTZ Datasheet - Page 15

• Manufacturer Part Number: AD1981HDJSTZ
• Description: IC CODEC HD AUDIO 1.0 48LQFP
• Manufacturer: Analog Devices Inc
• Series: SoundMAX®r
• Type: Audio Codec '97, HDr

Specifications of AD1981HDJSTZ

• 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: 4.5 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

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.
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
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.
Table 27. Jack Sense Mapping
Resistor
(1% tolerance)
5.1 kΩ
10.0 kΩ
20.0 kΩ
39.2 kΩ
Name
Line Out
Line In
Front Microphone
Headphone Out
SENSE_A
Port
D
C
B
A
SS
). Jacks
HD Audio Node ID
0x05
0x08
0x06
0x09
Rev. 0 | Page 15 of 16
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
and AV
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.
DD
Name
N/A
N/A
Rear Microphone
Aux In
. In the second method, the designer can add up to
SENSE_B
Port
N/A
N/A
F
E
DD
and between SENSE_B
HD Audio Node ID
N/A
N/A
0x18
0x17
AD1981HD