AC ’97 SoundMAX® Codec

AD1888

Rev. A

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©2005 Analog Devices, Inc. All rights reserved.

FEATURES

AC ’97 2.3 compatible features

6 DAC channels for 5.1 surround

90 dB dynamic range

20-bit PCM DACs

S/PDIF output

Integrated stereo headphone amplifiers

Phone, aux, and line-in

High quality CD input

Selectable MIC input

Mono output

External amplifier power-down control

Power-management modes

48-lead LQFP and 48-lead LFCSP

ENHANCED FEATURES

Selectable front and rear MIC inputs with preamp

Integrated PLL for system clocking

Crystal-free operation

Variable sample rate 7 kHz to 96 kHz

Jack sense (auto topology switching)

Software-controlled VREF_OUT for MIC bias

Software enabled outputs for jack sharing

Auto down-mix and channel spreading modes

FUNCTIONAL BLOCK DIAGRAM

ID0

ID1

RESET

SYNC

BIT_CLK

SDATA_OUT

SDATA_IN

SPDIF_OUT

EAPD

JS0

JS1

VREF

VREFOUT

AC '97

CONTROL

REGISTERS

DAC

SLOT

LOGIC

G = GAIN

A = ATTENUATION

M=MUTE

Z= HIGH-Z

M

A

MONO_OUT

M

GA

M

16-BIT

Σ-Δ

ADC

G

M

G

M

M

M

M

M

M

M

GA

M

GA

M

GA

M

GA

M

GA

M

GA

M

GA

M

GA

M

GA

M

GA

M

GA

M

GA

M

GA

ADC

SLOT

LOGIC

PLL

SPDIF

TX

EAPD

JACK

SENSE

LOGIC

VOLTAGE

REFERENCE

M

A

SURR_L/

HP_OUT_L

HP

M

A

SURR_R/

HP_OUT_R

HP

MZ

A

LFE_OUT

MZ

A

CENTER_OUT

MZ

A

LINE_OUT_R

MZ

A

LINE_OUT_L

16-BIT

Σ-Δ

ADC

PHONE_IN

CD_L

CD_R

AUX_L

AUX_R

LINE_IN_L

LINE_IN_R

MIC1

MIC2

XTAL_IN

AD1888

XTAL_OUT

20-BIT

Σ-Δ

DAC

20-BIT

Σ-Δ

DAC

20-BIT

Σ-Δ

DAC

20-BIT

Σ-Δ

DAC

20-BIT

Σ-Δ

DAC

20-BIT

Σ-Δ

DAC

M

GA

G

DIFF

AMP

Figure 1.