AD1981HD Analog Devices Data Handbook/Manual
Summary
Revolutionize your audio design with this advanced HD Audio Codec. This specialized component offers enhanced features like selectable DAC/ADC channels, high dynamic range (over 90 dB), and versatile connectivity options including S/PDIF output. The manual provides comprehensive documentation detailing functional block diagrams, jack presence detection methods, power management modes, and pin configurations. It is an essential resource for professional hardware engineers developing high-performance audio equipment that requires robust digital conversion and speakerphone capabilities.
Page 1 Text Content
HD Audio Sound MAX® Codec
AD1981HD IO IN TE FA
FEATURES ENHANCED FEATURES 2 DAC channels: 16-, 20-, or 24-bit No AFILT pins, results in BOM savings SE LE TO 2 ADC channels: 16- or 20-bit 5.0 V AVDD supply, 3.3 V DVDD supply HD audio sample rates Jack-sensing autoconfiguration options 8 k Hz, 11.025 k Hz, 16 k Hz, 22.05 k Hz, 32 k Hz, Mute line output and monaural output (MONO_OUT) 44.1 k Hz, 48 k Hz when headphones are used Greater than 90 d B dynamic range Mute MONO_OUT when a device is in the line out jack
SE LE TO
S/PDIF output: 32 k Hz, 44.1 k Hz or 48 k Hz, 16- or 24-bit SE LE TO Selectable trip level: high/low supports all jack types
Digital beep and analog PC beep pass-through Peripheral identification/enumeration
Integrated headphone amplifiers on two ports PO T-
Jack event/presence detection using SENSE or GPIO pins
Port retasking Microphone to MONO_OUT for speakerphone applications
Selectable microphone and line inputs _R Advanced power management modes _G Full analog mixer _L
4 software-controlled microphone bias pins Legacy inputs: CD and auxiliary inputs Up to 30 d B microphone boost External amplifier power-down (EAPD) 4 GPIOs—external control or traditional jack sense
48-pin, Pb-free LQFP
FUNCTIONAL BLOCK DIAGRAM
AVDD 5V
GPIOGPIO SE LE TO
PC BEEP RESET
JACK SENSE GAM MONO_OUT
SENSE SE LE TO SE LE TO SE LE TO SE LE TO
PCM/AC3
S/PDIF_OUT
S/PDIF TX
GAM HP PORT-A HEADPHONE
EQ PCM Σ-Δ DAC MIC
GA BIAS MIC_BIAS-D
PC BEEP PC BEEP GAM HP PORT-D LINE_OUT
BOOST
DIGITAL PC BEEP
MIC MIC_BIAS-C
MM BIAS MM
GAM PORT-C
GA GAGA
LINE_IN
BOOST
GA GA
MIC MIC_BIAS-F BIAS
GAM PORT-F REAR MIC
PCM/FLOAT32 Σ-Δ ADC BOOST
DIFF MIC MIC_BIAS-B BIAS
BOOST PORT-B
FRONT MIC
Figure 1.
Rev. 0 Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use.
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Specifications subject to change without notice. No license is granted by implication
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Page Summary Contents For AD1981HD Analog Devices Data Handbook/Manual
Manual Details
| Brand | Analog Devices |
|---|---|
| Pages | 16 |
| File Size | 380.04 KB |
| Published | May 14, 2026 |
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Frequently Asked Questions
What sampling rates can this audio codec handle?
It supports various sample rates, including 8 kHz, 16 kHz, 22.05 kHz, and 48 kHz for both S/PDIF and analog outputs.
How does the device detect when a jack is connected?
It utilizes integrated jack event detection via designated SENSE or GPIO pins, which supports autoconfiguration based on external resistors.
What kind of audio quality can I expect from this unit?
The codec provides a dynamic range greater than 90 dB and features both DAC and ADC channels with specified bit depths (e.g., 24-bit).
Is it possible to reconfigure the microphone input for speakers?
Yes, one advanced feature allows port retasking, enabling microphone signals to output through internal lines like MONO_OUT for speakerphone applications.