AC ’97 SoundMAX CODEC
AD1986
FEATURES
AC `97 2.3 COMPLIANT FEATURES
6 DAC channels for 5.1 surround
S/PDIF output
Integrated headphone amplifiers
Variable rate audio
Double rate audio (F
s
= 96 kHz)
Greater than 90 dB dynamic range
20-bit resolution on all DACs
20-bit resolution on all ADCs
Line-level mono phone input
High quality CD input
Selectable MIC input w/preamp
AUX and line-in stereo inputs
External amplifier power down (EAPD)
Power management modes
Jack sensing and device identification
48-pin LQFP package
ENHANCED FEATURES
Integrated parametric equalizer
Stereo microphone with up to 30 dB gain boost
Integrated PLL for system clocking
Variable sample rate: 7 kHz to 96 kHz
7 kHz to 48 kHz in 1 Hz increments
96 kHz for double rate audio
Jack sense with auto topology switching
Jack presence detection on up to 8 jacks
Three software-controlled VREF_OUT signals
Software-enabled outputs for jack sharing
Auto-down mix and channel spreading
Microphone-to-mono output
Stereo microphone pass-through to mixer
Built-in microphone/center/LFE/line-in sharing
Built-in SURROUND/LINE_IN sharing
Center/LFE line swapping
Microphone swapping
Reduced support component count
General purpose digital output pin (GPO)
Separate LINE_OUT and HP_OUT pins
Headphone drivers on LINE_OUT and HP_OUT pins
Independent headphone/LINE_OUT operation
Rev. 0
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Specifications subject to change without notice. No license is granted by implication
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© 2004 Analog Devices, Inc. All rights reserved.
AD1986
TABLE OF CONTENTS
Functional Block Diagram .............................................................. 4
Specifications..................................................................................... 5
AC ’97 Timing Parameters .......................................................... 9
Absolute Maximum Ratings.......................................................... 12
Environmental Conditions........................................................ 12
ESD Caution................................................................................ 12
Pin Configuration And Function Description ........................... 13
AC ’97 Registers .............................................................................. 15
Register Details ............................................................................... 17
Reset (Register 0x00).................................................................. 17
Master Volume (Register 0x02) ................................................ 17
Headphone Volume (Register 0x04)........................................ 18
Mono Volume (Register 0x06).................................................. 18
PC Beep (Register 0x0A)........................................................... 19
Phone Volume (Register 0x0C) ................................................ 19
Microphone Volume (Register 0x0E) ...................................... 20
Line In Volume (Register 0x10)................................................ 21
CD Volume (Register 0x12) ...................................................... 21
AUX Volume (Register 0x16) ................................................... 22
Front DAC Volume (Register 0x18)......................................... 22
ADC Select (Register 0x1A)...................................................... 23
ADC Volume (Register 0x1C) .................................................. 24
General-Purpose (Register 0x20)............................................. 25
Audio Int and Paging (Register 0x24) ..................................... 25
Power-Down Ctrl/Stat (Register 0x26).................................... 26
Ext’d Audio ID (Register 0x28)................................................. 27
Ext’d Audio Stat/Ctrl (Register 0x2A)...................................... 28
Front DAC PCM Rate (Register 0x2C) ................................... 29
Surround DAC PCM Rate (Register 0x2E) ............................ 30
C/LFE DAC PCM Rate (Register 0x30) .................................. 30
ADC PCM Rate (Register 0x32) .............................................. 30
C/LFE DAC Volume (Register 0x36)....................................... 31
Surround DAC Volume (Register 0x38) ................................. 31
SPDIF Control (Register 0x3A)................................................ 32
EQ Control Register (Register 0x60) ....................................... 33
EQ Data Register (Register 0x62) ............................................ 34
Misc Control Bits 2 (Register 0x70)......................................... 34
Jack Sense (Register 0x72)......................................................... 35
Serial Configuration (Register 0x74)....................................... 37
Misc Control Bits 1 (Register 0x76)......................................... 39
Advanced Jack Sense (Register 0x78) ...................................... 40
Misc Control Bits 3 (Register 0x7A)........................................ 41
Vendor ID Registers (Register 0x7C to 0x7E) ........................ 42
CODEC Class/Revision Register (Register 0x60).................. 42
PCI Subsystem Vendor ID Register (Register 0x62, Page 01)
....................................................................................................... 43
PCI Subsystem Device ID Register (Register 0x64, Page 01)43
Function Select Register (Register 0x66, Page 01)................. 43
Information and I/O Register (Register 0x68, Page 01)........ 44
Sense Register (Register 0x6A, Page 01) ................................. 46
Jack Presence Detection................................................................. 48
Audio Jack Styles (NC/NO) ...................................................... 48
Microphone Selection/Mixing...................................................... 49
Outline Dimensions ....................................................................... 50
Ordering Guide .......................................................................... 50
REVISION HISTORY
10/04—Initial Version: Revision 0
Rev. 0 | Page 2 of 52
AD1986
NOTES
REDUCED SUPPORT COMPONENTS
The AD1986’s many improvements reduce external support
components for particular applications.
•
Multiple Microphone Sourcing:
The MIC_1/2, LINE_IN
and C/LFE pins may all be selected as sources for
microphone input (boost amplifier).
Multiple VREF_OUT Pins:
Each microphone-capable pin
group (MIC_1/2, LINE_IN and C/LFE) has separate,
software controllable VREF_OUT pins, reducing the need
for external biasing components.
Internal Microphone Mixing:
Any combination of the
MIC_1/2, LINE_IN and C/LFE pins may be summed to
produce the microphone input. This removes the need for
external mixing components in those applications that
externally mixed microphone sources.
•
•
Advanced Jack Presence Detection:
Using two CODEC
pins, eight resistors and isolated switch jacks, the AD1986
can detect jack insertion on eight separate jacks. Previous
CODECs would have required 8 CODEC pins and
16 resistors.
Internal Microphone/Line In/C/LFE Sharing:
On systems
that share the microphone with the C/LFE jack there are
no external components required. The micro-phone
selector can select the LINE_IN pins in those cases where
the microphone and line input devices are swapped.
Internal Line In/Microphone/Surround Sharing:
On
systems that share the line in with the surround jack there
are no external components required.
Dual Headphone Amplifiers:
The AD1986 can drive
headphones out of the HP_OUT or LINE_OUT pins.
•
•
•
•
Rev. 0 | Page 3 of 52
AD1986
FUNCTIONAL BLOCK DIAGRAM
SPDIF_OUT
MIC_1
MIC_2
MICROPHONE
SELECTOR/
MIXING AND
GAIN BLOCK
AC97CK
AD1986
SPDIF TX
PLL
RECORD
SELECTOR
AUX_L
AUX_R
LINE_IN_L
LINE_IN_R
PCBEEP_IN
G
M
20-BIT
Σ-∆
ADC
ADC
SLOT
LOGIC
AC '97 INTERFACE V2.3
PHONE_IN
CD_L
CD_GND
CD_R
CODEC CORE
CD
DIFF AMP
RESET
SYNC
BITCLK
G
M
20-BIT
Σ-∆
ADC
LINE
IN
SELECT
SDATA_OUT
DAC
SLOT
LOGIC
24-BIT
Σ-∆
DAC
LFE_OUT
MZ
A
SPRD
SDATA_IN
M
GA
SPRD
CENTER_OUT
MZ
A
M
GA
GA
GA
M
M
GA
M
GA
M
GA
M
GA
M
GA
M
M
A
GA
M
M
M
GA
24-BIT
Σ-∆
DAC
AC '97
CONTROL
REGISTERS
MONO_OUT
M
A
MIX
ANALOG MIXING CONTROL
JACK SENSE
EQ COEF STORAGE
M
M
M
SOSEL
SURR_OUT_L
MZ
A
PC BEEP
GENERATOR
24-BIT
Σ-∆
DAC
24-BIT
Σ-∆
DAC
JACK_SENSE_A
SURR_OUT_R
MZ
A
SOSEL
M
M
GA
GA
EQ
EQ
JACK_SENSE_B
LINE_OUT_L
HP
M
A
LOSEL
LOSEL
LINE_OUT_R
HP
M
A
Σ
Σ
Σ
M
M
M
GA
GA
24-BIT
Σ-∆
DAC
24-BIT
Σ-∆
DAC
G
Z
GPIO
EAPD
EAPD
GPO
VREF_OUT
(MIC1/2)
VREF_OUT
(C/LFE)
VREF_OUT
(LINE_IN)
HPSEL
G
VOLTAGE
REFERENCE
M
Z
HP_OUT_L
HP
M
A
HPSEL
HP_OUT_R
HP
M
A
VREF_FILT
Figure 1.
Rev. 0 | Page 4 of 52
04785-0-003
G = GAIN
A = ATTENUATION
M = MUTE
Z = HI-Z
G
Z
AD1986
SPECIFICATIONS
Test conditions, unless otherwise noted.
Table 1.
Parameter
Temperature
Digital Supply (DV
DD
)
Analog Supply (AV
DD
)
Sample Rate (F
S
)
Input Signal
Analog Output Pass Band
V
IH
V
IL
V
IH
V
IL
Typ
25
3.3 ±10%
5.0 ±10%
48
1,008
20 Hz–20 kHz
2.0
0.8
2.4
0.6
Unit
°C
V
V
kHz
Hz
V
V
V
V
DAC Test Conditions
Calibrated
Output −3 dB Relative to Full Scale
10 kΩ Output Load: Line (Surround), Mono, Center, and LFE
32 Ω Output Load: Headphone
ADC Test Conditions
Calibrated
0 dB PGA Gain
Input −3.0 dB Relative to Full Scale
Table 2. Analog Input
Input Voltage
MIC_1/2, LINE_IN, CD, AUX, PHONE_IN (No Preamp)
C/LFE and SURROUND (When Used as Inputs)
MIC_1/2, LINE_IN, C/LFE With 30 dB Preamp
MIC_1/2, LINE_IN, C/LFE With 20 dB Preamp
MIC_1/2, LINE_IN, C/LFE With 10 dB Preamp
Input Impedance
2
Input Capacitance
Min
Typ
1
2.83
0.032
0.089
0.1
0.283
0.316
0.894
20
5
Max
Unit
VRMS
1
V p-p
VRMS
V p-p
VRMS
V p-p
VRMS
V p-p
kΩ
pF
2
7.5
1
2
RMS values assume sine wave input.
Guaranteed by design, not production tested.
Table 3. Master Volume
Parameter
Step Size (LINE_OUT, HP Out, Mono Out, SURROUND, CENTER, LFE)
Output Attenuation Range (0 dB to –46.5 dB)
Mute Attenuation of 0 dB Fundamental
2
Min
Typ
−1.5
−6.5
Max
−80
Unit
dB
dB
dB
Table 4. Programmable Gain Amplifier—ADC
Parameter
Step Size
PGA Gain Range Span (0 dB to 22.5 dB)
Min
Typ
1.5
22.5
Max
Unit
dB
dB
Rev. 0 | Page 5 of 52
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