1 10/02/98

SigmaTel, Inc.

Integrating Mixed-Signal Solutions

STAC9704/7

Multimedia Audio Codec for AC'97

GENERAL DESCRIPTION:

SigmaTel's STAC9704/07 is a general purpose 18-bit, full duplex, audio codec that conforms to the analog
component specification of AC'97 (Audio Codec '97 Component Specification rev. 1.03). The

STAC9704/07

incorporates SigmaTel's

proprietary Sigma-Delta technology to achieve signal quality in excess of 95dB SNR.

The DACs, ADCs, and mixers are integrated with analog I/Os, which include four analog line-level stereo inputs,
two analog line-level mono inputs, and 3 output channels. Also included are SigmaTel's 3D stereo enhancement
(SS3D) and an extra true line-level out for headphones or speaker amplifiers. The

STAC9704/07 communicates

via the five wire AC Link to any digital component of AC'97 providing flexibility in the audio system design.
Packaged in a small AC'97 compliant 48-pin TQFP, the

STAC9704/07 can be placed on the motherboard,

daughter boards, add-on cards, PCMCIA cards, or outside the main chassis such as in a speaker. The 9707 is
identical to the 9704 except that the 9707 is tested at AVdd = DVdd = 3.3V.

FEATURES:

High performance

technology

18-bit full duplex stereo A/D, D/A

AC-link protocol compliance

Single power source from 5V to 3.3V

AC'97 compliant mixer

SigmaTel Surround (SS3D)

Stereo

Enhancement

Energy saving power down modes

48k sample/second rate

Six analog line-level inputs

48-pin TQFP

SNR > 95 dB through Mixer and DAC

STAC9707 is the 3.3 volt version

SigmaTel, Inc

STAC9704/7

10/02/98

Table of Contents

General Description

Ordering Information

1. PIN/SIGNAL Descriptions

1.1 Digital I/O

1.2 Analog I/O

1.3

Filter and Voltage References

1.4

Power and Ground Signals

2. AC-Link

2.1 Clocking

2.2 Reset

3. Digital Interface

3.1 AC-link Digital Serial Interface
Protocol

3.1.1 AC-link Audio Output Frame
(SDATA_OUT)

3.1.1.1 Slot 1: Command Address Port

3.1.1.2 Slot 2: Command Data Port

3.1.1.3 Slot 3: PCM Playback Left

Channel

3.1.1.4 Slot 4: PCM Playback Right

Channel

3.1.1.5 Slots 5-12: Reserved.

3.1.2 AC-link Audio Input Frame

(SDATA_IN)

3.1.2.1 Slot 1: Status Address Port

3.1.2.2 Slot 2: Status Data Port

3.1.2.3 Slot 3: PCM Record Left

Channel

3.1.2.4 Slot 4: PCM Record Right

Channel

3.1.2.5 Slots 5-12: Reserved

3.2 AC-link Low Power Mode

3.2.1 Waking up the AC-Link

4. STAC9704/7 Mixer

4.1 Mixer Input.

4.2 Mixer Output

4.3 PC Beep Implementations

4.4 Mixer Registers

4.4.1 Reset Register

4.4.2 Play Master Volume Registers

4.4.3 PC Beep Register

4.4.4 Analog Mixer Input Gain

4.4.5 Record Select Control

4.4.6 Record Gain Registers

4.4.7 General Purpose Register

4.4.8 3D Control Register

4.4.9 Powerdown Control/Status

5. Low Power Modes

6. Testability

7. AC Timing Characteristics

7.1 Cold Reset.

7.2 Warm Reset

7.3 Clocks

7.4 Data Setup and Hold

7.5 Signal Rise and Fall Times

7.6 AC-link Low Power Mode Timing

7.7 ATE Test Mode

8. Electrical Specifications

8.1 Absolute Maximum Ratings

8.2 Recommended Operating Conditions 38
8.3 Power Consumption

8.4 AC link Static Digital Specifications 39
8.5

9704 Analog Performance

Characteristics

8.6

9707 Analog Performance

Characteristics

APPENDIX A

APPENDIX B

SigmaTel, Inc

STAC9704/7

10/02/98

Table of Contents Tables

Table 1  Package Dimensions

Table 2  Pin Designation

Table 3 Digital Signal List

Table 4 Analog Signal List

Table 5 Filtering and Voltage References

Table 6 Power Signal List STAC9704/07

Table 7

Table 8 Mixer Functional Connections

Table 9 Mixer Registers

Table 10 Play Master Volume Register

Table 11 PC Beep Register

Table 12 Analog Mixer Input Gain Register

Table 13 Record Select Control Registers

Table 14 Record Gain Registers

Table 15 General Purpose Register

Table 16 3D Control Register

Table 17 Powerdown Status Register

Table 18 Low Power Modes

Table 19 Cold Reset

Table 20 Warm Reset

Table 21 Clocks

Table 22 Data Setup and Hold

Table 23 Signal Rise and Fall Times

Table 24 AC-link Low Power Mode Timing

Table 25 ATE Test Mode

Table 26 Operating Conditions

Table 27 Power Consumption

Table 28 AC-link Static Specifications

Table 29 9704 Analog Performance

Characteristics

Table 30 9707 Analog Performance

Characteristics

Table of Contents Figures

Figure 1 Package Outline

Figure 2 STAC9704 Block Diagram

Figure 3 Connection Diagram

Figure 4 STAC9704/07 AC'97 Link

Figure 5 AC'97 Bi-directional Audio Frame

Figure 6 AC-link Audio Output Frame

Figure 7 Start of an Audio Output Frame

Figure 8 STAC9704/07 Audio Input Frame

Figure 9 Start of an Audio Input Frame

Figure 10 STAC9704 Powerdown Timing

Figure 11 STAC9704/07 Mixer Functional Diagram 22

Figure 12 Example of STAC9704/07 Powerdown/

Powerup flow

Figure 13 STAC9704/07 Powerdown/Powerup

with analog still alive

Figure 14 Cold Reset

Figure 15 Warm Reset

Figure 16 Clocks

Figure 17 Data Setup and Hold

Figure 18 Signal Rise and Fall Times

Figure 19 AC-link Low Power Mode Timing

Figure 20 ATE Test Mode

SigmaTel, Inc

STAC9704/7

10/02/98

Figure 1  Package Outline

SigmaTel

STAC9704/7

48 pin TQFP

Table 1 - Package Dimensions

KEY

9704/7 DIMENSION

TQFP

9.00 mm

7.00 mm

9.00 mm

7.00 mm

a (lead width)

0.20 mm

e (pitch)

0.50 mm

thickness

1.4 mm

Table 2 - Pin Designation

PIN

SIGNAL

NAME

N #

SIGNAL

NAME

PIN

SIGNAL

NAME

PIN

SIGNAL

NAME

DVdd1

PHONE

AVdd1

MONO_OUT

XTL_IN

AUX_L

AVss1

AVdd2

XTL_OUT

AUX_R

Vref

LNLVL_OUT_L

DVss1

VIDEO_L

Vrefout

SDATA_OUT

VIDEO_R

AFILT1

LNLVL_OUT_R

BIT_CLK

CD_L

AFILT2

AVss2

DVss2

CD_GND

SDATA_IN

CD_R

CAP2

DVdd2

MIC1

SYNC

MIC2

RESET#

LINE_IN_L

LINE_OUT_L

PC_BEEP

LINE_IN_R

LINE_OUT_R

# denotes active low

Ð­Ð»ÐµÐºÑ‚Ñ€Ð¾Ð½Ð½Ñ‹Ð¹ ÐºÐ¾Ð¼Ð¿Ð¾Ð½ÐµÐ½Ñ‚: STAC9707

ÐÐ»ÐµÐºÑ‚Ñ€Ð¾Ð½Ð½Ñ‹Ð¹ ÐºÐ¾Ð¼Ð¿Ð¾Ð½ÐµÐ½Ñ‚: STAC9707