AD1981HD

Rev. 0

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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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Fax: 781.461.3113

© 2005 Analog Devices, Inc. All rights reserved.

FEATURES

2 DAC channels: 16-, 20-, or 24-bit

2 ADC channels: 16- or 20-bit

HD audio sample rates

8 kHz, 11.025 kHz, 16 kHz, 22.05 kHz, 32 kHz,

44.1 kHz, 48 kHz

Greater than 90 dB dynamic range

S/PDIF output: 32 kHz, 44.1 kHz or 48 kHz, 16- or 24-bit

Digital beep and analog PC beep pass-through

Integrated headphone amplifiers on two ports

Port retasking

Selectable microphone and line inputs

Full analog mixer

Legacy inputs: CD and auxiliary inputs

External amplifier power-down (EAPD)

48-pin, Pb-free LQFP

ENHANCED FEATURES

No AFILT pins, results in BOM savings

Jack-sensing autoconfiguration options

Mute line output and monaural output (MONO_OUT)

when headphones are used

Mute MONO_OUT when a device is in the line out jack

Selectable trip level: high/low supports all jack types

Peripheral identification/enumeration

Jack event/presence detection using SENSE or GPIO pins

Microphone to MONO_OUT for speakerphone applications

Advanced power management modes

4 software-controlled microphone bias pins

Up to 30 dB microphone boost

4 GPIOs—external control or traditional jack sense

FUNCTIONAL BLOCK DIAGRAM

EQ

PCM

Σ-Δ DAC

S/PDIF_OUT

GPIO

GPIO

JACK

SENSE

SENSE

DIGITAL

PC BEEP

Σ

GA

G

PC BEEP

GA

GA

GA

GA

GA

GA

PC BEEP

PCM/FLOAT32

Σ-Δ ADC

M

G

PCM/AC3

S/PDIF TX

GAM

GAM

HP

GAM

BOOST

BOOST

MIC

BIAS

HP

Z

Z

GAM

MIC

BIAS

Z

Z

BOOST

GAM

MIC

BIAS

Z

Z

BOOST

MIC

BIAS

Z

DIFF

AMP

Σ

M

M

MIC_BIAS-C

PORT-C

MONO_OUT

PORT-A

MIC_BIAS-F

PORT-F

MIC_BIAS-D

PORT-D

MIC_BIAS-B

PORT-B

LINE_IN

HEADPHONE

REAR MIC

LINE_OUT

FRONT MIC

RESET

PC BEEP

5V

M

M

M

M

M

M

M

M

Figure 1.