PRELIMINARY
SigmaTel, Inc.
Integrating Mixed-Signal Solutions
STAC9708/11
Multi-Channel AC'97 Codec
With Multi-Codec Option
GENERAL DESCRIPTION:
SigmaTel’s
STAC9708/11
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. 2.1). The
STAC9708/11
incorporates
SigmaTel’s
proprietary Sigma-Delta technology to achieve a DAC SNR in excess of 95dB. The
DACs, ADCs, and mixer are integrated with analog I/Os, which include four analog line-level stereo inputs, two
analog line-level mono inputs, two stereo outputs, and one mono output channel. Also included are two
additional high quality DACs, with independent volume control, for multi-channel applications. With
SigmaTel’s
3D stereo enhancement (SS3D), independently selectable on both LINE OUT and DAC OUT, the
multi-channel mode immerses the user in a richer and livelier listening experience. The
STAC9708/11
may be
used as a secondary codec, with the
STAC9704/07
as the primary, in a multiple codec configuration conforming
to the AC'97 Rev. 2.1 specification. This configuration can provide true six-channel, AC-3 playback required for
DVD applications. The
STAC9708/11
communicates via the five-wire AC-Link to any digital component of
AC'97 providing flexibility in the audio system design. Packaged in an AC'97 compliant 48-pin TQFP, the
STAC9708/11
can be placed on the motherboard, daughter boards, add-on cards or PCMCIA cards.
FEATURES:
•
•
•
•
•
•
High performance
Σ ∆
technology
Two additional high quality DAC’s
for multi-channel applications
18-bit full duplex stereo ADC, DACs
AC-Link protocol compliance
Multiple power supply options
Pin compatible with the STAC9704/07
•
•
•
•
•
•
SigmaTel Surround
Enhancement
(SS3D)
Stereo
Energy saving power down modes
Multi-Codec option (Intel AC'97 rev 2.1)
Six analog line-level inputs
48-pin TQFP
SNR > 95 dB through Mixer and DAC
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ORDERING INFORMATION:
PART
NUMBER
STAC9708T
STAC9711T
PACKAGE
48-pin TQFP 7mm x7mm x 1.4mm
48-pin TQFP 7mmx7mm x 1.4mm
TEMPERATURE
RANGE
0o C to +70o C
0o C to +70o C
SUPPLY RANGE
DVdd = 3.3V or 5V, AVdd = 5V
DVdd = 3.3V, AVdd = 3.3V
SigmaTel reserves the right to change specifications without notice.
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SigmaTel, Inc
Table of Contents
General Description
Ordering Information
1. PIN/SIGNAL Descriptions
1.1 Digital I/O
1.2 Analog I/O
1.3 Filter/References/GPIO
1.4 Power and Ground Signal
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)
Preliminary
STAC9708/11
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
21
21
21
21
21
22
23
25
25
25
26
27
27
27
28
28
30
30
30
31
32
33
33
33
33
33
34
36
36
36
36
36
37
1
2
9
9
10
11
12
12
13
13
14
14
3.2 AC-Link Low Power Mode
3.2.1 Waking up the AC-Link
4. STAC9708/11 Mixer
4.1 Mixer Input.
4.2 Mixer Output
4.3 PC Beep Implementations
4.4 Programming 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 Multi-Channel Programming
4.4.10 Powerdown Control/Status
4.4.10.1 External Amplifier Power
Down (EAPD) Control
4.4.11 Extended Audio ID Register
4.4.12 Extended Audio Status Register
4.4.13 Analog Special Register
4.4.14 Vendor ID1 and ID2 Registers
5. Low Power Modes
6. Multiple Codec Support
6.1 Primary/Secondary Codec Selection
6.1.1 Primary Codec Operation
6.1.2 Secondary Codec Operation
6.2 Secondary Codec Register Access
Definitions
7. Testability
15
16
17
17
17
17
17
18
18
18
18
18
19
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 Slot 5: Reserved
3.1.1.6 Slot 6: PCM Center Channel
3.1.1.7 Slot 7: PCM Left Surround
Channel
3.1.1.8 Slot 8: PCM Right Surround
Channel
3.1.1.9 Slot 9: PCM Low Frequency
Channel
3.1.1.10 Slot 10: PCM Alternate Left
3.1.1.11 Slot 11: PCM Alternate Right
3.1.1.12 Slot 12: Reserved
3.1.2 AC-Link Audio Input Frame
(SDATA_In)
3.1.2.1 Slot 1: Status Address Port
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20
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SigmaTel, Inc
8. Extended Codec Functionality
8.1 Anti-Pop Circuitry
9. AC Timing Characteristics
9.1 Cold Reset.
9.2 Warm Reset
9.3 Clocks
9.4 Data Setup and Hold
9.5 Signal Rise and Fall Times
9.6 AC-Link Low Power Mode Timing
9.7 ATE Test Mode
10. Electrical Specifications
10.1 Absolute Maximum Conditions
10.2 Recommended Operating Conditions
10.3 Power Consumption
10.4 AC-Link Static Digital Specifications
10.5 9708 Analog Performance
Characteristics
10.6 9711 Analog Performance
Characteristics
APPENDIX A
APPENDIX B
Preliminary
38
38
38
38
39
40
41
42
43
44
45
45
45
46
46
47
49
51
52
STAC9708/11
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SigmaTel, Inc
Table of Contents – Tables
Table 1 –
Package Dimensions
Table 2 –
Pin Designation
Table 3
– Digital Signal List
Table 4
– Analog Signal List
Preliminary
6
6
9
10
11
11
24
25
26
27
27
28
29
29
30
31
31
32
36
37
36
36
37
38
39
40
40
5
STAC9708/11
44
45
45
46
48
Table 30
– Operating Conditions
Table 28
– Power Consumption
Table 29
– AC-Link Static Specifications
Table 30
– 9708 Analog Performance
Characteristics
Table 31
– 9711 Analog Performance
Characteristics
Table 5
– Filtering and Voltage References
Table 6
– 9708/11 Power Signal List
Table 7
–Mixer Functional Connections
Table 8
– Programming Registers
Table 9
– Play Master Volume Register
Table 10
– PC Beep Register
Table 11
– Analog Mixer Input Gain Register
Table 12, 13
– Record Select Control Registers
Table 14
– Record Gain Registers
Table 15
– General Purpose Registers
Table 16, 17
– 3D Control Registers
Table 18–
Multi-Channel Programming
Register
Table 19
– Powerdown Status Registers
Table 20
– Low Power Modes
Table 21
- Codec ID Selection
Table 22
- Secondary Codec Register Access
Slot 0 Bit Definitions
Table 23
– Cold Reset
Table 24
– Warm Reset
Table 25
– Clocks
Table 26
– Data Setup and Hold
Table 27
– Signal Rise and Fall Times
Table 28
– AC-Link Low Power Mode Timing
Table 29
– ATE Test Mode
Table of Contents – Figures
Figure 1
– Package Outline
Figure 2
– STAC9708 Block Diagram
Figure 3
– Connection Diagram
Figure 4
– STAC9708 AC-Link
Figure 5
– AC'97 Standard Bi-directional
Figure 6
– AC-Link Audio Output Frame
Figure 7
– Start of an Audio Output Frame
Figure 8
– STAC9708 Audio Input Frame
Figure 9
– Start of an Audio Input Frame
Figure 10
– STAC9708 Powerdown Timing
Figure 11
– STAC9708 Mixer Functional Diagram
Figure 12
– Example of STAC9708 Powerdown/
Powerup flow
Figure 13
– STAC9708 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
6
7
8
12
15
15
16
19
20
22
23
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35
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39
39
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