AD AD1888

AC ’97 SoundMAX® Codec
AD1888
FEATURES
ENHANCED 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
Double rate audio (fS = 96 kHz)
Power-management modes
48-lead LQFP and 48-lead LFCSP
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
XTAL_IN
AD1888
MIC1
MIC2
G
XTAL_OUT
PHONE_IN
PLL
CD_L
DIFF
AMP
G
CD_R
AUX_L
M
AUX_R
G
LINE_IN_L
M
16-BIT Σ-Δ
ADC
16-BIT Σ-Δ
ADC
ADC
SLOT
LOGIC
ID0
LINE_IN_R
M
GA
MONO_OUT
M
A
M
MZ
LINE_OUT_R
MZ
M
GA
M
GA
M
LINE_OUT_L
GA
GA
GA
GA
GA
M
M
M
A
LFE_OUT
MZ
A
SURR_L/
HP_OUT_L
HP
M
A
SURR_R/
HP_OUT_R
HP
M
A
M
M
M
M
BIT_CLK
SDATA_OUT
M
DAC
SLOT
LOGIC
M
GA
20-BIT Σ-Δ
DAC
M
GA
20-BIT Σ-Δ
DAC
M
GA
20-BIT Σ-Δ
DAC
M
GA
20-BIT Σ-Δ
DAC
A
MZ
SYNC
M
A
CENTER_OUT
RESET
M
G = GAIN
A = ATTENUATION
M = MUTE
Z = HIGH-Z
SDATA_IN
SPDIF
TX
SPDIF_OUT
EAPD
EAPD
JACK
SENSE
LOGIC
VOLTAGE
REFERENCE
M
GA
20-BIT Σ-Δ
DAC
M
GA
20-BIT Σ-Δ
DAC
JS0
JS1
VREF
VREFOUT
04294-001
GA
AC '97
CONTROL
REGISTERS
AC '97 INTERFACE
ID1
Figure 1.
Rev. A
Information furnished by Analog Devices is believed to be accurate and reliable. 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. Specifications subject to
change without notice. No license is granted by implication or otherwise under any patent
or patent rights of Analog Devices. Trademarks and registered trademarks are the property
of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113
©2005 Analog Devices, Inc. All rights reserved.
AD1888
TABLE OF CONTENTS
Specifications..................................................................................... 3
Pin Configuration and Function Descriptions..............................9
Test Conditions............................................................................. 3
Outline Dimensions ....................................................................... 31
Timing Parameters ........................................................................... 6
Ordering Guide .......................................................................... 31
Absolute Maximum Ratings............................................................ 8
Environmental Conditions.......................................................... 8
ESD Caution.................................................................................. 8
REVISION HISTORY
8/05—Rev. 0 to Rev. A
Updated Outline Dimensions ....................................................... 31
Changes to Ordering Guide .......................................................... 31
10/03—Revision 0: Initial Version
Rev. A | Page 2 of 32
AD1888
SPECIFICATIONS
DAC Test Conditions
TEST CONDITIONS
Standard Test Conditions
Unless otherwise noted:
•
Temperature
•
Digital Supply (DVDD)
•
Analog Supply (AVDD)
•
Sample Rate (fS)
•
Input Signal
•
Analog Output Pass Band
25°C
3.3 V
5.0 V
48 kHz
1 kHz
20 Hz to 20 kHz
•
•
•
•
•
Calibrated
−3 dB attenuation relative to full scale
0 dB input
10 kΩ output load LINE_OUT, MONO_OUT, CENTER_OUT,
and LFE_OUT
32 Ω output load (HP_OUT)
ADC Test Conditions
•
•
•
Calibrated
0 dB gain
Input −3.0 dB relative to full scale
Table 1.
Parameter
ANALOG INPUT
Input Voltage (RMS Values Assume Sine Wave Input)
LINE_IN, CD, AUX, PHONE_IN
Min
Typ
1
2.83
0.032
0.089
0.1
0.283
0.316
0.894
1
2.83
20
5
MIC_IN with 30 dB Preamp
MIC_IN with 20 dB Preamp
MIC_IN with 10 dB Preamp
MIC_IN with 0 dB Gain
Input Impedance 1
Input Capacitance1
MASTER VOLUME
Step Size (Line Out, Mono Out, Surround Out, Center, LFE)
Output Attenuation Range Span1
Mute Attenuation of 0 dB Fundamental1
PROGRAMMABLE GAIN AMPLIFIER—ADC
Step Size (0 dB to 22.5 dB)
PGA Gain Range Span
ANALOG MIXER—INPUT GAIN/AMPLIFIERS/ATTENUATORS
Signal-to-Noise Ratio (SNR)
CD to LINE_OUT
LINE, AUX, or PHONE to LINE_OUT1
MIC1 or MIC2 (Note: MIC Gain of 0 dB) to LINE_OUT1
Step Size All Mixer Inputs
Input Gain/Attenuation Range: All Mixer Inputs
DIGITAL DECIMATION AND INTERPOLATION FILTERS1
Pass Band
Pass-Band Ripple
Transition Band
Stop Band
Stop-Band Rejection
Group Delay
Group Delay Variation over Pass Band
Max
Unit
7.5
V rms
V p-p
V rms
V p-p
V rms
V p-p
V rms
V p-p
V rms
V p-p
KΩ
pF
80
dB
dB
dB
1.5
46.5
1.5
22.5
dB
dB
90
90
90
1.5
46.5
dB
dB
dB
dB
dB
0
0.4 × fS
±0.09
0.6 × fS
∞
0.4 × fS
0.6 × fS
−74
16/fS
0
Rev. A | Page 3 of 32
Hz
dB
Hz
Hz
dB
sec
μs
AD1888
Parameter
ANALOG-TO-DIGITAL CONVERTERS
Resolution
Total Harmonic Distortion (THD) AVDD = 5.0 V
Dynamic Range (−60 dB Input THD + N Referenced to FS, A-Weighted)
AVDD = 5.0 V
Signal-to-Intermodulation Distortion1 (CCIF Method)
ADC Crosstalk1
Line Inputs (Input L, Ground R, Read R; Input R, Ground L, Read L)
LINE_IN to Other
Gain Error (Full-Scale Span Relative to Nominal Input Voltage)
Interchannel Gain Mismatch (Difference of Gain Errors)
ADC Offset Error1 (0 dB Gain, HPF On)
DIGITAL-TO-ANALOG CONVERTERS
Resolution
Total Harmonic Distortion (THD), LINE_OUT, AVDD = 5.0 V
Total Harmonic Distortion (THD), HP_OUT, AVDD = 5.0 V
Total Harmonic Distortion (THD), CENTER/LFE, AVDD = 5.0 V
Dynamic Range (−60 dB Input THD + N Referenced to FS A-Weighted)
AVDD = 5.0 V, All Outputs
Signal-to-Intermodulation Distortion1 (CCIF Method)
Gain Error (Full-Scale Span Relative to Nominal Input Voltage)
Interchannel Gain Mismatch (Difference of Gain Errors)
DAC Crosstalk (Input L, Zero R, Read LINE_OUT_R; Input R,
Zero L, Read LINE_OUT_L, 10 kΩ Load)1
Total Audible Out-of-Band Energy1 (Measured from 0.6 × fS to 20 kHz)
ANALOG OUTPUT
Full-Scale Output Voltage; LINE_OUT/MONO_OUT, CENTER_OUT, LFE_OUT
Output Impedance1
External Load Impedance1 (LINE_OUT, CENTER_OUT/LFE_OUT, MONO_OUT)
Output Capacitance1
External Load Capacitance1
Full-Scale Output Voltage; HP_OUT (0 dB Gain)
External Load Impedance1; HP_OUT
VREF
VREF_OUT (VREFH = 0)
VREF_OUT (VREFH = 1)
VREF_OUT Current Drive
Mute Click (Muted Output Minus Unmuted Midscale DAC Output)
STATIC DIGITAL SPECIFICATIONS
High Level Input Voltage (VIH): Digital Inputs
Low Level Input Voltage (VIL)
High Level Output Voltage (VOH), IOH = 2 mA
Low Level Output Voltage (VOL), IOL = 2 mA
Input Leakage Current
Output Leakage Current
Rev. A | Page 4 of 32
Min
Typ
Max
16
−78
Bits
dB
80
84
dB
dB
−85
−85
±10
±0.5
±10
dB
dB
%
dB
mV
20
−80
−70
−80
Bits
dB
dB
dB
90
88
±10
±0.7
−80
dB
dB
%
dB
dB
−40
dB
1
2.83
300
V rms
V p-p
Ω
kΩ
pF
pF
V rms
Ω
V
V
V
mA
mV
10
15
100
1
32
2.05
2.25
2.25
3.65
2.45
5
±5
0.65 × DVDD
0.35 × DVDD
0.9 × DVDD
−10
−10
Unit
0.1 × DVDD
+10
+10
V
V
V
V
μA
μA
AD1888
Parameter
POWER SUPPLY
Power Supply Range, Analog (AVDD)
Power Supply Range, Digital (DVDD)
Power Dissipation 5 V/3.3 V
Analog Supply Current 5 V (AVDD)
Digital Supply Current 3.3 V (DVDD)
Power Supply Rejection (100 mV p-p Signal @ 1 kHz)1
(At Both Analog and Digital Supply Pins, Both ADCs and DACs)
1
2
Max
Unit
5.25
3.45
563
70
53
V
V
mW
mA
mA
−40
dB
4.75
3.15
PR[K:I] 1
PR[6:0]1
DVDD Typ
AVDD Typ
Unit
000
000
000
010
101
111
000
000
111
111
111
000
000 0000
000 0001
000 0010
000 0000
000 0000
000 0011
000 0100
000 0101
000 0110
000 0111
011 1111
100 0000
53
44
46
46
46
12
52
45
31
12
0
52
70
66
61
61
61
33
44
39
14
8
0
65
mA
mA
mA
mA
mA
mA
mA
mA
mA
mA
mA
mA
PR bits are controlled in Reg. 2Ah and 26h.
Values presented with VREFOUT loaded.
Parameter
CLOCK SPECIFICATIONS 1
Input Clock Frequency (XTAL Mode or Clock Oscillator)
Input Clock Frequency (Reference Clock Mode)
Input Clock Frequency (USB Clock Mode)
Recommended Clock Duty Cycle
1
Typ
Guaranteed but not tested.
Parameter
POWER-DOWN STATES 2
Fully Active
ADC
FRONT DAC
SURROUND DAC
CENTER/LFE DAC
ADC + ALL DACs
Mixer
ADC + Mixer
ALL DACs + Mixer
ADC + ALL DACs + Mixer
Standby
Headphone Standby
1
Min
Guaranteed but not tested.
Rev. A | Page 5 of 32
Min
Typ
40
24.576
14.31818
48.000
50
Max
Unit
60
MHz
MHz
MHz
%
AD1888
TIMING PARAMETERS
Guaranteed over operating temperature range.
Table 2.
Parameter
RESET Active Low Pulse Width
RESET Inactive to BIT_CLK Startup Delay
SYNC Active High Pulse Width
SYNC Low Pulse Width
SYNC Inactive to BIT_CLK Startup Delay
BIT_CLK Frequency
BIT_CLK Frequency Accuracy
BIT_CLK Period
BIT_CLK Output Jitter 1, 2
BIT_CLK High Pulse Width
BIT_CLK Low Pulse Width
SYNC Frequency
SYNC Period
Setup to Falling Edge of BIT_CLK
Hold from Falling Edge of BIT_CLK
BIT_CLK Rise Time
BIT_CLK Fall Time
SYNC Rise Time
SYNC Fall Time
SDATA_IN Rise Time
SDATA_IN Fall Time
SDATA_OUT Rise Time
SDATA_OUT Fall Time
End of Slot 2 to BIT_CLK, SDATA_IN Low
Setup to RESET Inactive (SYNC, SDATA_OUT)
Rising Edge of RESET to Hi-Z Delay
Propagation Delay
RESET Rise Time
Output Valid Delay from BIT_CLK Rising
Typ
1.0
Max
162.8
400,000
1.3
19.5
162.8
12.288
±1.0
tCLK_PERIOD
81.4
750
tCLK_HIGH
tCLK_LOW
40
39.7
41.7
41.4
48.0
20.8
tSYNC_PERIOD
tSETUP
tHOLD
tRISECLK
tFALLCLK
tRISESYNC
tFALLSYNC
tRISEDIN
tFALLDIN
tRISEDOUT
tFALLDOUT
tS2_PDOWN
tSETUP2RST
tOFF
4
3
2
2
2
2
2
2
2
2
0
15
4
4
4
4
4
4
4
4
6
6
6
6
6
6
6
6
1.0
25
15
50
15
Guaranteed but not tested.
Output jitter directly dependent on crystal input jitter.
tRST2CLK
tRST_LOW
RESET
tTRI2ACTV
BIT_CLK
04294-002
2
Min
tTRI2ACTV
SDATA_IN
Figure 2. Cold Reset Timing (Codec is Supplying the Bit_CLK Signal)
tSYNC_HIGH
tSYNC2CLK
SYNC
04294-003
1
Symbol
tRST_LOW
tRST2CLK
tSYNC_HIGH
tSYNC_LOW
tSYNC2CLK
BIT_CLK
Figure 3. Warm Reset Timing
Rev. A | Page 6 of 32
Unit
μs
ns
μs
μs
ns
MHz
ppm
ns
ps
ns
ns
kHz
μs
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
μs
ns
ns
ns
ns
ns
AD1888
tCLK_LOW
BIT_CLK
tCO
tCLK_HIGH
tSETUP
tCLK_PERIOD
BIT_CLK
VIH
VIL
tSYNC_LOW
SDATA_OUT
VOH
SDATA_IN
VOL
SYNC
tHOLD
04294-004
tSYNC_HIGH
tSYNC_PERIOD
04294-007
SYNC
Figure 7. AC-Link Low Power Mode Timing
Figure 4. Clock Timing
BIT_CLK
tRISECLK
tFALLCLK
SYNC
RESET
tRISESYNC
tFALLSYNC
SDATA_OUT
tRISEDIN
SDATA_IN, BIT_CLK,
EAPD, SPDIF_OUT
AND DIGITAL I/O
tFALLDIN
Hi-Z
tOFF
tRISEDOUT
tFALLDOUT
04294-005
SDATA_OUT
Figure 5. Signal Rise and Fall Times
SLOT 1
SLOT 2
WRITE TO
0x26
DATA
PR4
Figure 8. ATE Test Mode
SYNC
BIT_CLK
SDATA_OUT
SDATA_IN
BIT_CLK NOT TO SCALE
04294-006
tS2_PDOWN
Figure 6. AC-Link low Power Mode Timing
Rev. A | Page 7 of 32
04294-008
tSETUP2RST
SDATA_IN
AD1888
ABSOLUTE MAXIMUM RATINGS
Table 3.
Parameter
Power Supplies
Digital (DVDD)
Analog (AVDD)
Input Current (Except Supply Pins)
Analog Input Voltage (Signal Pins)
Digital Input Voltage (Signal Pins)
Ambient Temperature (Operating)
Storage Temperature
Min
Max
Unit
−0.3
−0.3
+3.6
+6.0
±10.0
AVDD + 0.3
DVDD + 0.3
+70
+150
V
V
mA
V
V
°C
°C
−0.3
−0.3
0
−65
Stresses greater than those listed under Absolute Maximum
Ratings may cause permanent damage to the device. This is a
stress rating only and functional operation of the device at these
or any other conditions above those indicated in the operational
section of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect
device reliability.
ENVIRONMENTAL CONDITIONS
Ambient temperature rating: 1
TCASE = Case temperature in °C
PD = Power dissipation in W
θJA = Thermal resistance (junction-to-ambient)
θJC = Thermal resistance (junction-to-case)
1
All measurements per EIA/JESD51 with 2S2P test board per EIA/JESD51-7.
Table 4.
Package
LQFP
LFCSP
θJA
50.1°C/W
50°C/W
θJC
17.8°C/W
25.88°C/W
ESD CAUTION
ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on
the human body and test equipment and can discharge without detection. Although this product features
proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy
electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance
degradation or loss of functionality.
Rev. A | Page 8 of 32
AD1888
48 47 46 45 44 43 42
MONO_OUT
AVDD2
SURR_OUT_L/HP_OUT_L
AVSS2
SURR_OUT_R/HP_OUT_R
NC
AVDD3
AVSS3
ID0
ID1
EAPD
SPDIF
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
41 40 39 38 37
DVDD1 1
36 LINE_OUT_R (FRONT_R)
PIN 1
XTL_IN 2
35 LINE_OUT_L (FRONT_L)
XTL_OUT 3
34 AVDD4
DVSS1 4
33 AVSS4
SDATA_OUT 5
32 LFE_OUT
AD1888
BIT_CLK 6
31 CENTER_OUT
TOP VIEW
(Not to Scale)
DVSS2 7
30 AFILT2
SDATA_IN 8
29 AFILT1
DVDD2 9
28 VREFOUT
SYNC 10
27 VREF
RESET 11
26 AVSS1
NC 12
25 AVDD1
04294-009
LINE_IN_R
LINE_IN_L
MIC2
MIC1
CD_R
CD_GND_REF
CD_L
JS0
JS1
AUX_R
AUX_L
NC = NO CONNECT
PHONE_IN
13 14 15 16 17 18 19 20 21 22 23 24
Figure 9. Pin Configuration
Table 5. Pin Function Descriptions
Pin No.
Mnemonic
DIGITAL INPUT/OUTPUT
2
XTL_IN
3
XTL_OUT
5
SDATA_OUT
6
BIT_CLK
8
SDATA_IN
10
SYNC
11
RESET
48
SPDIF
CHIP SELECTS/CLOCK STRAPPING
45
ID0
46
ID1
JACK SENSE AND EAPD
47
EAPD
17
JS0
16
JS1
ANALOG INPUT/OUTPUT
13
PHONE_IN
14
AUX_L
15
AUX_R
18
CD_L
19
CD_GND_REF
20
CD_ R
21
MIC1
22
MIC2
I/O
Function
I
O
I
O/I
O
I
I
O
Crystal Input (24.576 MHz) or External Clock In (24.576 MHz, 14.31818 MHz, or 48000 MHz).
Crystal Output.
AC-Link Serial Data Output. AD1888 input stream.
AC-Link Bit Clock. 12.288 MHz serial data clock. (Input pin for Secondary mode only.)
AC-Link Serial Data Input. AD1888 output stream.
AC-Link Frame Sync.
AC-Link Reset. AD1888 master H/W reset.
SPDIF Output.
I
I
Chip Select Input 0 (Active Low).
Chip Select Input 1 (Active Low).
O
I
I
EAPD Output.
Jack Sense 0 Input.
Jack Sense 1 Input.
I
I
I
I
I
I
I
I
Monaural Line-Level Input.
Auxiliary Input, Left Channel.
Auxiliary Input, Right Channel.
CD Audio Left Channel.
CD Audio Analog Ground Reference for Differential CD Input.
CD Audio Right Channel.
Rear Panel MIC Input.
Front Panel MIC Input.
Rev. A | Page 9 of 32
AD1888
Pin No.
Mnemonic
23
LINE_IN_L
24
LINE_IN_R
31
CENTER_OUT
32
LFE_OUT
35
LINE_OUT_L
36
LINE_OUT_R
37
MONO_OUT
39
SURR_OUT_L/HP_OUT_L
41
SURR_OUT_R/HP_OUT_R
FILTER/REFERENCE
27
VREF
28
VREFOUT
29
AFILT1
30
AFILT2
POWER AND GROUND SIGNALS
1
DVDD1
4
DVSS1
7
DVSS2
9
DVDD2
25
AVDD1
26
AVSS1
33
AVSS4
34
AVDD4
38
AVDD2
40
AVSS2
43
AVDD3
44
AVSS3
NO CONNECTS
12
NC
42
NC
I/O
I
I
O
O
O
O
O
O
O
Function
Line-In Left Channel.
Line-In Right Channel.
Center Channel Output.
Low Frequency Enhanced Output.
Line Out (Front) Left Channel.
Line Out (Front) Right Channel.
Monaural Output to Telephone Subsystem Speakerphone.
Surround Front Headphone Left Channel Output.
Surround Front Headphone Right Channel Output.
O
O
O
O
Voltage Reference Filter.
Voltage Reference Output 5 mA Drive (intended for MIC bias).
Antialiasing Filter Capacitor—ADC Right Channel.
Antialiasing Filter Capacitor—ADC Left Channel.
I
I
I
I
I
I
I
I
I
I
I
I
Digital VDD 3.3 V.
Digital GND.
Digital GND.
Digital VDD 3.3 V.
Analog VDD 5.0 V.
Analog GND.
Analog GND.
Analog VDD 5.0 V.
Analog VDD 5.0 V.
Analog GND.
Analog VDD 5.0 V.
Analog GND.
No Connect.
No Connect.
Rev. A | Page 10 of 32
AD1888
Table 6. Indexed Control Registers
Reg
Name
D15
D14
D13
D12
D11
D10
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
Default
00h
Reset
X
SE4
SE3
SE2
SE1
SE0
ID9
ID8
ID7
ID6
ID5
ID4
ID3
ID2
ID1
ID0
0090h
02h
Master
Volume
MM
X
LMV5
LMV4
LMV3
LMV2
LMV1
LMV0
MMRM 1
X
RMV5
RMV4
RMV3
RMV2
RMV1
RMV0
8000h
X
RHV5
RHV4
RHV3
RHV2
RHV1
RHV0
8000h
04h
Headphone
Volume
HPM
06h
Mono
Volume
MVM
X
X
X
X
X
X
X
X
X
MV5
MV4
MV2
MV2
MV1
MV0
8000h
0Ch
Phone
Volume
PHM
X
X
X
X
X
X
X
X
X
X
PHV4
PHV3
PHV2
PHV1
PHV0
8008h
0Eh
MIC
Volume
MCM
X
X
X
X
X
X
X
X
M20
X
MCV4
MCV3
MCV2
MCV1
MCV0
8008h
RLV3
RLV2
RLV1
RLV0
8808h
10h
Line-In
Volume
LVM
X
X
LHV5
X
LHV4
LLV4
LHV3
LLV3
LHV2
LLV2
LHV1
LLV1
LHV0
1
LLV0
HPRM
1
LVRM
X
X
RLV4
1
12h
CD
Volume
CVM
X
X
LCV4
LCV3
LCV2
LCV1
LCV0
CDRM
X
X
RCV4
RCV3
RCV2
RCV1
RCV0
8808h
16h
AUX
Volume
AVM
X
X
LAV4
LAV3
LAV2
LAV1
LAV0
AVRM1
X
X
RAV4
RAV3
RAV2
RAV1
RAV0
8808h
18h
PCM Out
Volume
OM
X
X
LOV4
LOV3
LOV2
LOV1
LOV0
OMRM1
X
X
ROV4
ROV3
ROV2
ROV1
ROV0
8808h
1Ah
Record
Select
X
X
X
X
X
LS2
LS1
LS0
X
X
X
X
X
RS2
RS1
RS0
0000h
1
1Ch
Record
Gain
IM
X
X
X
LIM3
LIM2
LIM1
LIM0
IMRM
X
X
X
RIM3
RIM2
RIM1
RIM0
8000h
20h
GeneralPurpose
X
X
X
X
DRSS1
DRSS0
X
MS
LPBK
X
X
X
X
X
X
X
0000h
24h
Audio Int.
and Paging
I4
X
X
X
I0
X
X
X
X
X
X
X
PG3
PG2
PG1
PG0
xxxxh
26h
Power-Down
Ctrl/Stat
EAPD
PR6
PR5
PR4
PR3
PR2
PR1
PR0
X
X
X
X
REF
ANL
DAC
ADC
NA
28h
Ext’d
Audio ID
ID1
ID0
X
X
REV1
REV0
AMAP
LDAC
SDAC
CDAC
DSA1
DSA0
X
SPDIF
DRA
VRA
x3C7h
2Ah
Ext’d Audio
Stat/Ctrl
VFORCE
X
PRK
PRJ
PRI
SPCV
X
ELDAC
ESDAC
ECDAC
SPSA1
SPSA0
X
ESPDIF
EDRA
EVRA
0xx0h
2Ch
PCM Front
DAC Rate
SRF15
SRF14
SRF13
SRF12
SRF11
SRF10
SRF9
SRF8
SRF7
SRF6
SRF5
SRF4
SRF3
SRF2
SRF1
SRF0
BB80h
2Eh
PCM Surr
DAC Rate
SRS15
SRS14
SRS13
SRS12
SRS11
SRS10
SRS9
SRS8
SRS7
SRS6
SRS5
SRS4
SRS3
SRS2
SRS1
SRS0
BB80h
30h
PCM C/LFE
DAC Rate
SRCL15
SRCL14
SRCL13
SRCL12
SRCL11
SRCL10
SRCL9
SRCL8
SRCL7
SRCL6
SRCL5
SRCL4
SRCL3
SRCL2
SRCL1
SRCL0
BB80h
32h
PCM L/R
ADC Rate
SRA15
SRA14
SRA13
SRA13
SRA11
SRA10
SRA9
SRA8
SRA7
SRA6
SRA5
SRA4
SRA3
SRA2
SRA1
SRA0
BB80h
36h
Center/LFE
Volume
LM
X
LFE5
LFE4
LFE3
LFE2
LFE1
LFE0
CM
X
CNT5
CNT4
CNT3
CNT2
CNT1
CNT0
8080h
38h
Surround
Volume
MUTE_L
X
LSR5
LSR4
LSR3
LSR2
LSR1
LSR0
MUTE_R
X
RSR5
RSR4
RSR3
RSR2
RSR1
RSR0
8080h
3Ah
SPDIF
Control
V
X
SPSR1
SPSR0
L
CC6
CC5
CC4
CC3
CC2
CC1
CC0
PRE
COPY
/AUD
PRO
2000h
72h
JACK
SENSE
JS
SPRD
JS1
DMX
JS0
DMX
JS
MT2
JS
MT1
JS
MT0
X
X
JS1
TMR
JS0
TMR
JS1
MD
JS0
MD
JS1
ST
JS0
ST
JS1
INT
JS0
INT
0000h
74h
Serial
Configuration
SLOT 16
REGM2
REGM1
REGM0
REGM3
DRF
X
CHEN
X
LBKS1
LBKS0
INTS
X
SPAL
SPDZ
SPLNK
1001h
76h
Misc
Control
Bits
DACZ
AC97NC
MSPLT
LODIS
CLDIS
HPSEL
DMIX1
DMIX0
SPRD
X
LOSEL
SRU
VREFH
VREFD
MBG1
MBG0
0000h
7Ch
Vendor
ID1
F7
F6
F5
F4
F3
F2
F1
F0
S7
S6
S5
S4
S3
S2
S1
S0
4144h
7Eh
Vendor
ID2
T7
T6
T5
T4
T3
T2
T1
T0
REV7
REV6
REV5
REV4
REV3
REV2
REV1
REV0
5368h
1
For AC ’97 compatibility, Bit D7 is only available by setting the MSPLT bit, Register 76h. The MSPLT bit enables separate mute bits for the left and right channels. If
MSPLT is not set, Bit D7 has no effect.
All registers not shown and bits containing an X are assumed to be reserved.
Odd register addresses are aliased to the next lower even address.
Reserved registers should not be written to.
Zeros should be written to reserved bits.
Rev. A | Page 11 of 32
AD1888
Table 7. Reset Register (Index 00h)
Reg No.
00h
Name
Reset
D15
X
D14
SE4
D13
SE3
D12
SE2
D11
SE1
D10
SE0
D9
ID9
D8
ID8
D7
ID7
D6
ID6
D5
ID5
D4
ID4
D3
ID3
D2
ID2
D1
ID1
D0
ID0
Default
0090h
All registers not shown and bits containing an X are assumed to be reserved.
Writing any value to this register performs a register reset, which causes all registers to revert to their default values (except 74h, which forces the serial configuration).
Reading this register returns the ID code of the part and a code for the type of 3D Stereo Enhancement.
ID[9:0] Identify Capability. The ID decodes the capabilities of AD1888 based on the following:
Bit = 1
ID0
ID1
ID2
ID3
ID4
ID5
ID6
ID7
ID8
ID9
Function
Dedicated Mic PCM In Channel
Modem Line Codec Support
Bass and Treble Control
Simulated Stereo (Mono to Stereo)
Headphone Out Support
Loudness (Bass Boost) Support
18-Bit DAC Resolution
20-Bit DAC Resolution
18-Bit ADC Resolution
20-Bit ADC Resolution
AD1888
0
0
0
0
1
0
0
1
0
0
SE[4:0] Stereo Enhancement. The AD1888 does not provide hardware 3D stereo enhancement. (All bits are zeros.)
Table 8. Master Volume Register (Index 02h)
Reg
No.
02h
Name
Master
Volume
D15
MM
D14
X
D13 1
LMV5
D12
LMV4
D11
LMV3
D10
LMV2
D9
LMV1
D8
LMV0
D7
MMRM 2
D6
X
D51
RMV5
D4
RMV4
D3
RMV3
D2
RMV2
D1
RMV1
D0
RMV0
Default
8000h
1
Refer to Table 10 for examples. This register controls the Line_Out volume controls for both stereo channels and mute bit. Each volume subregister contains five bits,
generating 32 volume levels with 31 steps of 1.5 dB each. Because AC ’97 defines 6-bit volume registers, to maintain compatibility whenever the D5 or D13 bits are set
to 1, their respective lower five volume bits are automatically set to 1 by the codec logic. On readback, all lower five bits will read 1s whenever these bits are set to 1.
2
For AC ’97 compatibility, Bit D7 is available only by setting the MSPLT bit, Register 76h. The MSPLT bit enables separate mute bits for the left and right channels. If
MSPLT is not set, Bit D7 has no effect. All registers not shown and bits containing an X are assumed to be reserved.
Note that depending on the state of the AC97NC bit in Register 0x76, this register has the following additional functionality:
For AC97NC = 0, the register controls the Line_out output Attenuators only.
For AC97NC = 1, the register controls the Line_out, Center, and LFE output Attenuators.
RMV[5:0]
MMRM
LMV[5:0]
MM
Right Master Volume Control. The least significant bit represents 1.5 dB. This register controls the output from 0 dB to a
maximum attenuation of 46.5 dB.
Right Channel Mute. Once enabled by the MSPLT bit in Register 76h, this bit mutes the right channel separately from the MM
bit. Otherwise this bit will always read 0 and will have no effect when set to 1.
Left Master Volume Control. The least significant bit represents 1.5 dB. This register controls the output from 0 dB to a maximum
attenuation of 46.5 dB.
Headphones Volume Mute. When this bit is set to 1, both the left and the right channels are muted, unless the MSPLT bit in
Register 76h is set to 1.
Rev. A | Page 12 of 32
AD1888
Table 9. Headphones Volume Register (Index 04h)
Reg No.
04h
Name
Headphone
Volume
D15
HPM
D14
X
D13
LHV5
D12
LHV4
D11
LHV3
D10
LHV2
D9
LHV1
D8
LHV0
D7
HPRM1
D6
X
D5
RHV5
D4
RHV4
D3
RHV3
D2
RHV2
D1
RHV1
D0
RHV0
Default
8000h
Table 10. Volume Settings for Master and Headphone
Reg. 76h
MSPLT 1
T
0
0
0
0
0
1
D15
0
0
0
0
1
0
WRITE
00 0000
00 1111
01 1111
1x xxxx
xx xxxx
1x xxxx
1
1
1
1
xx xxxx
xx xxxx
1
Control Bits
Master Volume (02h) and Headphone Volume (04h)
Left Channel Volume D[13:8]
Right Channel Volume D[5:0]
1
READBACK
Function
D7
WRITE
READBACK
Function
00 0000
0 dB Gain
x
00 0000 00 0000
0 dB Gain
00 1111
−22.5 dB Gain
x
00 1111 00 1111
−22.5 dB Gain
01 1111
−46.5 dB Gain
x
01 1111 01 1111
−46.5 dB Gain
01 1111
−46.5 dB Gain
x
1x xxxx
01 1111
−46.5 dB Gain
xx xxxx
−∞ dB Gain, Muted
x
xx xxxx
xx xxxx
−∞ dB Gain, Muted
01 1111
−46.5 dB Gain
1
xx xxxx
xx xxxx
−∞ dB Gain, only
Right Muted
xx xxxx
−∞ dB Gain, Left only Muted
0
xx xxxx
xx xxxx
−46.5 dB Gain
xx xxxx
−∞ dB Gain, Left Muted
1
xx xxxx
xx xxxx
−∞ dB Gain, Right Muted
For AC ’97 compatibility, Bit D7 is available only by setting the MSPLT bit, Register 76h. The MSPLT bit enables separate mute bits for the left and right channels. If
MSPLT is not set, Bit D7 has no effect.
x in the above table is don’t care.
Table 11. Mono Volume Register (Index 06h)
Reg
No.
06h
1
Name
Mono
Volume
D15
MVM
D14
X
D13
X
D12
X
D11
X
D10
X
D9
X
D8
X
D7
X
D6
X
D5 1
MV5
D4
MV4
D3
MV3
D2
MV2
D1
MV1
D0
MV0
Default
8000h
Refer to Table 12 for examples. This register controls the Mono output volume and mute bit. The volume register contains five bits, generating 32 volume levels with
31 steps of 1.5 dB each. Because AC ’97 defines 6-bit volume registers, to maintain compatibility, whenever the D5 bit is set to 1, their respective lower five volume bits
are automatically set to 1 by the codec logic. On readback, all lower five bits will read 1s whenever this bit is set to 1. All registers not shown and bits containing an X
are assumed to be reserved.
MV[5:0]
MVM
Mono Volume Control. The least significant bit represents 1.5 dB. This register controls the output from 0 dB to a
maximum attenuation of 46.5 dB.
Mono Volume Mute. When this bit is set to 1, the channel is muted.
Table 12. Volume Settings for Mono
D15
0
0
0
1
WRITE
0 0000
0 1111
1 1111
x xxxx
Control Bits D[4:0] for Mono (06h)
READBACK
0 0000
0 1111
1 1111
x xxxx
x in the above table is a wild card and has no effect on the value.
Rev. A | Page 13 of 32
Function
0 dB Gain
−22.5 dB Gain
−46.5 dB Gain
−∞ dB Gain, Muted
AD1888
Table 13. Phone_in Volume Register (Index 0Ch)
Reg
No.
0Ch
Name
Phone_in
Volume
D15
PHM
D14
X
D13
X
D12
X
D11
X
D10
X
D9
X
D8
X
D7
X
D6
X
D5
X
D4
PHV4
D3
PHV3
D2
PHV2
D1
PHV1
D0
PHV0
Default
8008h
All registers not shown and bits containing an X are assumed to be reserved. Refer to Table 15 for examples.
PHV[4:0]
Phone Volume. Allows setting the Phone Volume attenuator in 32 volume levels with 31 steps of 1.5 dB each. The LSB represents
1.5 dB, and the gain range is +12 dB to −34.5 dB. The default value is 0 dB, with the mute bit enabled.
Phone Mute. When this bit is set to 1, the Phone channel is muted.
PHM
Table 14. MIC Volume Register (Index 0Eh)
Reg
No.
0Eh
Name
MIC
Volume
D15
MCM
D14
X
D13
X
D12
X
D11
X
D10
X
D9
X
D8
X
D7
X
D6
M20
D5
X
D4
MCV4
D3
MCV3
D2
MCV2
D1
MCV1
D0
MCV0
Default
8008h
All registers not shown and bits containing an X are assumed to be reserved. Refer to Table 15 for examples.
MCV[4:0]
M20
MCM
MIC Volume Gain. Allows setting the MIC Volume attenuator in 32 volume levels. The LSB represents 1.5 dB, and the gain range
is +12 dB to −34.5 dB. The default value is 0 dB, with mute enabled.
MIC Gain Boost. This bit allows setting additional MIC gain to increase the microphone sensitivity. The nominal gain boost by
default is 20 dB; however, Bits D0 and D1 (MBG[1:0]) on the miscellaneous control bits register (76h) allow changing the gain
boost to 10 dB or 30 dB, if necessary.
0 = Disabled; Gain = 0 dB
1 = Enabled; Default Gain = 20 dB (see Register 76h, Bits D0, D1)
MIC Mute. When this bit is set to 1, the channel is muted.
Table 15. Volume Settings for Phone and MIC
D15
0
0
0
1
WRITE
0 0000
0 1000
1 1111
x xxxx
Control Bits
D[4:0] Phone (0Ch) and MIC (0Eh)
READBACK
0 0000
0 1000
1 1111
x xxxx
x in the above table is a wild card, and has no effect on the value.
Rev. A | Page 14 of 32
Function
12 dB Gain
0 dB Gain
−34.5 dB Gain
−∞ dB Gain, Muted
AD1888
Table 16. Line-In Volume Register (Index 10h)
Reg
No.
10h
1
Name
Line-In
Volume
D15
LVM
D14
X
D13
X
D12
LLV4
D11
LLV3
D10
LLV2
D9
LLV1
D8
LLV0
D7
LVRM 1
D6
X
D5
X
D4
RLV4
D3
RLV3
D2
RLV2
D1
RLV1
D0
RLV0
Default
8808h
For AC ’97 compatibility, Bit D7 is available only by setting the MSPLT bit, Register 76h. The MSPLT bit enables separate mute bits for the left and right channels.
If MSPLT is not set, the Bit D7 has no effect. All registers not shown and bits containing an X are assumed to be reserved. Refer to Table 20 for examples.
RLV[4:0]
LVRM
LLV[4:0]
LVM
Right Line-In Volume. Allows setting the Line-In Right channel attenuator in 32 volume levels with 31 steps of 1.5 dB each. The
LSB represents 1.5 dB, and the range is +12 dB to −34.d dB. The default value is 0 dB, mute enabled.
Right Channel Mute. Once enabled by the MSPLT bit in Register 76h, this bit mutes the right channel separately from the LIM bit.
Otherwise, this bit will always read 0 and will have no effect when set to 1.
Left Line-In Volume. Allows setting the Line-In left channel attenuator in 32 volume levels with 31 steps of 1.5 dB each. The LSB
represents 1.5 dB, and the range is +12 dB to −34.5 dB. The default value is 0 dB, mute enabled.
Line-In Mute. When this bit is set to 1, both the left and the right channels are muted, unless the MSPLT bit in Register 76h is set
to 1, in which case this mute bit will only affect the left channel.
Table 17. CD Volume Register (Index 12h)
Reg
No.
12h
1
Name
CD
Volume
D15
CVM
D14
X
D13
X
D12
LCV4
D11
LCV3
D10
LCV2
D9
LCV1
D8
LCV0
D7
CDRM 1
D6
X
D5
X
D4
RCV4
D3
RCV3
D2
RCV2
D1
RCV1
D0
RCV0
Default
8808h
For AC ’97 compatibility, Bit D7 is available only by setting the MSPLT bit, Register 76h. The MSPLT bit enables separate mute bits for the left and right channels.
If MSPLT is not set, the Bit D7 has no effect. All registers not shown and bits containing an X are assumed to be reserved. Refer to Table 20 or examples.
RCV[4:0]
CDRM
LCV[4:0]
CVM
Right CD Volume. Allows setting the CD right channel attenuator in 32 volume levels with 31 steps of 1.5 dB each. The LSB
represents 1.5 dB, and the range is +12 dB to −34.5 dB. The default value is 0 dB, mute enabled.
Right Channel Mute. Once enabled by the MSPLT bit in Register 76h, this bit mutes the Right channel separately from the CVM
bit. Otherwise this bit will always read 0 and will have no effect when set to 1.
Left CD Volume. Allows setting the CD left channel attenuator in 32 volume levels with 31 steps of 1.5 dB each. The LSB
represents 1.5 dB, and the range is +12 dB to −24.5 dB. The default value is 0 dB, mute enabled.
CD Volume Mute. When this bit is set to 1, both the left and the right channels are muted, unless the MSPLT bit in Register 76h is
set to 1, in which case this mute bit will affect only the left channel.
Table 18. AUX Volume Register (Index 16h)
Reg
No.
16h
1
Name
AUX
Volume
D15
AVM
D14
X
D13
X
D12
LAV4
D11
LAV3
D10
LAV2
D9
LAV1
D8
LAV0
D7
AVRM 1
D6
X
D5
X
D4
RAV4
D3
RAV3
D2
RAV2
D1
RAV1
D0
RAV0
Default
8808h
For AC ’97 compatibility, Bit D7 is only available by setting the MSPLT bit, Register 76h. The MSPLT bit enables separate mute bits for the left and right channels.
If MSPLT is not set, Bit D7 has no effect. All registers not shown and bits containing an X are assumed to be reserved. Refer to Table 20 for examples.
RAV[4:0]
AVRM
LAV[4:0]
AVM
Right AUX Volume. Allows setting the AUX right channel attenuator in 32 volume levels with 31 steps of 1.5 dB each. The LSB
represents 1.5 dB, and the range is +12 dB to −34.5 dB. The default value is 0 dB, mute enabled.
Right Channel Mute. Once enabled by the MSPLT bit in Register 76h, this bit mutes the right channel separately from the AVM
bit. Otherwise, this bit will always read 0 and will have no affect when set to 1.
Left PCM Out Volume. Allows setting the PCM left channel attenuator in 32 volume levels. The LSB represents 1.5 dB, and the
range is +12 dB to −34.5 dB. The default value is 0 dB, mute enabled.
PCM Out Volume Mute. When this bit is set to 1, both the left and the right channels are muted, unless the MSPLT bit in Register
76h is set to 1, in which case this mute bit will affect only the left channel.
Rev. A | Page 15 of 32
AD1888
Table 19. PCM-Out Volume Register (Index 18h)
Reg
No.
18h
1
Name
PCM
Out
Volume
D15
OM
D14
X
D13
X
D12
LOV4
D11
LOV3
D10
LOV2
D9
LOV1
D8
LOV0
D7
OMRM 1
D6
X
D5
X
D4
ROV4
D3
ROV3
D2
ROV2
D1
ROV1
D0
ROV0
Default
8808h
For AC ’97 compatibility, Bit D7 is available only by setting the MSPLT bit, Register 76h. The MSPLT bit enables separate mute bits for the left and right channels.
If MSPLT is not set, Bit D7 has no effect. All registers not shown and bits containing an X are assumed to be reserved. Refer to Table 20 for examples.
Note that depending on the state of the AC97NC bit in Register 76h, this register has the following additional functionality:
For AC97NC = 0, the register also controls the Surround, Center, and LFE DAC Gain/Attenuators.
For AC97NC = 1, the register controls the PCM Out Volume only.
ROV[4:0]
OMRM
LOV[4:0]
OM
Right PCM Out Volume. Allows setting the PCM right channel attenuator in 32 volume levels. The LSB represents 1.5 dB, and the
gain range is +12 dB to −34.5 dB. The default value is 0 dB, mute enabled.
Right Channel Mute. Once enabled by the MSPLT bit in Register 76h, this bit mutes the right channel separately from the AVM
bit. Otherwise, this bit will always read 0 and will have no affect when set to 1.
Left PCM Out Volume. Allows setting the PCM left channel attenuator in 32 volume levels. The LSB represents 1.5 dB, and the
range is +12 dB to −34.5 dB. The default value is 0 dB, mute enabled.
PCM Out Volume Mute. When this bit is set to 1, both the left and the right channels are muted, unless the MSPLT bit in Register
76h is set to 1, in which case this mute bit will affect only the left channel.
Table 20. Volume Settings for Line-In, CD Volume, AUX, and PCM-Out
Reg. 76h
MSPLT 1
0
0
0
0
1
1
1
T
1
D15
0
0
0
1
0
1
1
WRITE
0 0000
0 1000
1 1111
x xxxx
1 1111
x xxxx
x xxxx
Control Bits
Line-In (10h), CD (12h), AUX (16h) and PCM-Out (18h)
Left Channel Volume D[12:8]
Right Channel Volume D[4:0]
READBACK Function
D71 WRITE READBACK Function
0 0000
12 dB Gain
x
0 0000 0 0000
12 dB Gain
0 1000
0 dB Gain
x
0 1000 0 1000
0 dB Gain
1 1111
−34.5 dB Gain
x
1 1111 1 1111
−34.5 dB Gain
x xxxx
−∞ dB Gain, Muted
x
x xxxx
x xxxx
−∞ dB Gain, Muted
1 1111
−34.5 dB Gain
1
x xxxx
x xxxx
−∞ dB Gain, Right Only Muted
x xxxx
−∞ dB Gain, Left Only Muted 0
1 1111 1 1111
−34.5 dB Gain
x xxxx
−∞ dB Gain, Left Muted
1
x xxxx
x xxxx
−∞ dB Gain, Right Muted
For AC ’97 compatibility, Bit D7 is only available by setting the MSPLT bit, Register 76h. The MSPLT bit enables separate mute bits for the left and right channels.
If MSPLT is not set, RM Bit has no effect.
x in the above table is don’t care.
Table 21. Record Select Control Register (Index 1Ah)
Reg
No.
1Ah
Name
Record
Select
D15
X
D14
X
D13
X
D12
X
D11
X
D10
LS2
D9
LS1
D8
LS0
D7
X
D6
X
D5
X
D4
X
D3
X
D2
RS2
D1
RS1
D0
RS0
Default
0000h
All registers not shown and bits containing an X are assumed to be reserved.
Refer to Table 22 for examples. Used to select the record source independently for the right and left channels. For MIC recording, see MS bit (Register 20h) for
MIC1 and MIC2 input selection.
RS [2:0]
LS [2:0]
Right Record Select
Left Record Select
Rev. A | Page 16 of 32
AD1888
Table 22. Settings for Record Select Control
LS [10:8]
000
001
010
011
100
101
110
111
Left Record Source
MIC
CD_L
Muted
AUX_L
LINE_IN_L
Stereo Mix (L)
Mono Mix
PHONE_IN
RS [2:0]
000
001
010
011
100
101
110
111
Right Record Source
MIC
CD_R
Muted
AUX_R
LINE_IN_R
Stereo Mix (R)
Mono Mix
PHONE_IN
Table 23. Record Gain Register (Index 1Ch)
Reg
No.
1Ch
1
Name
Record
Gain
D15
IM
D14
X
D13
X
D12
X
D11
LIM3
D10
LIM2
D9
LIM1
D8
LIM0
D7
IMRM 1
D6
X
D5
X
D4
X
D3
RIM3
D2
RIM2
D1
RIM1
D0
RIM0
Default
8000h
For AC ’97 compatibility, Bit D7 is available only by setting the MSPLT bit, Register 76h. The MSPLT bit enables separate mute bits for the left and right channels.
If MSPLT is not set, Bit D7 has no effect. All registers not shown and bits containing an X are assumed to be reserved. Refer to Table 24 for examples.
RIM[3:0]
IMRM
LIM[3:0]
IM
Right Input Mixer Gain Control. Each LSB represents 1.5 dB, 0000 = 0 dB, and the gain range is 0 dB to 22.5 dB.
Right Channel Mute. Once enabled by the MSPLT bit in Register 76h, this bit mutes the right channel separately from the IM bit.
Otherwise, this bit will always read 0 and will have no effect when set to 1.
Left Input Mixer Gain Control. Each LSB represents 1.5 dB, 0000 = 0 dB, and the gain range is 0 dB to 22.5 dB.
Input Mute. When this bit is set to 1, both the left and the right channels are muted, unless the MSPLT bit in Register 76h is set to
1, in which case this mute bit will affect only the left channel.
Table 24. Settings for Record Gain Register
Control Bits
Record Gain (1Ch)
Reg. 76h
MSPLT 1
0
0
0
1
1
1
T
1
D15
0
0
1
0
1
1
Left Channel Input Mixer D[11:8]
WRITE READBACK Function
1111
1111
22.5 dB Gain
0000
0000
0 dB Gain
xxxx
xxxx
−∞ dB Gain, Muted
1111
1111
22.5 dB Gain
xxxx
xxxx
−∞ dB Gain, Left Only Muted
xxxx
xxxx
−∞ dB Gain, Left Muted
D71
x
x
x
1
0
1
WRITE
1111
0000
xxxx
xxxx
1111
xxxx
Right Channel Input Mixer D[3:0]
READBACK Function
1111
22.5 dB Gain
0000
0 dB Gain
xxxx
−∞ dB Gain, Muted
xxxx
−∞ dB Gain, Right Only Muted
1111
22.5 dB Gain
xxxx
−∞ dB Gain, Right Muted
For AC ’97 compatibility, Bit D7 (RM) is available only by setting the MSPLT bit, Register 76h. The MSPLT bit enables separate mute bits for the left and right channels. If
MSPLT is not set, Bit D7 has no effect.
x is don’t care.
Rev. A | Page 17 of 32
AD1888
Table 25. General-Purpose Register (Index 20h)
Reg
No.
20h
Name
GeneralPurpose
D15
X
D14
X
D13
X
D12
X
D11
DRSS1
D10
DRSS0
D9
X
D8
MS
D7
LPBK
D6
X
D5
X
D4
X
D3
X
D2
X
D1
X
D0
X
Default
0000h
This register should be read before writing to generate a mask only for the bit(s) that need to be changed. All registers not shown and bits containing an X are assumed
to be reserved.
LPBK
MS
DRSS [1:0]
Loopback Control. This bit enables the digital internal loopback from the ADC to the front DAC. This feature is normally used
for test and troubleshooting.
0 = No Loopback (Default)
1 = Loopback PCM digital data from ADC output to DAC
See LBKS bit in Register 0x74 for changing the loopback path to use the Surround or Center/LFE DACs.
MIC Select. Selects Mono MIC input.
0 = Select MIC1, from rear panel MIC jack
1 = Select MIC2, from front panel MIC jack
Double Rate Slot Select. The DRSS bits specify the slots for the n + 1 sample outputs. PCM L (n + 1) and PCM R (n + 1) data are
by default provided in output slots 10 and 11.
00: PCM L, R n + 1 Data is on Slots 10, 11 (reset default)
01: PCM L, R n + 1 Data is on Slots 7, 8
10: Reserved
11: Reserved
Table 26. Audio Interrupt and Paging Mechanism Register (Index 24h)
Reg
No.
24h
Name
Audio
Interrupt and
Paging
D15
I4
D14
X
D13
X
D12
X
D11
I0
D10
X
D9
X
D8
X
D7
X
D6
X
D5
X
D4
X
D3
PG3
D2
PG2
D1
PG1
D0
PG0
Default
xxxxh
This register controls the audio interrupt and paging mechanism. All registers not shown and bits containing an X are assumed to be reserved.
PG[3:0]
I0
I4
Page Selector (Read Only). This register is used to describe page selector capability for extended features. Reading these bits
returns 0h, which describes page selection as vendor specific only.
INTERRUPT ENABLE (R/W). This enables interrupt generation.
0 = Interrupt Generation is Masked (Default)
1 = Interrupt Generation is Unmasked
The S/W should not unmask the interrupt unless ensured by the AC ’97 controller that no conflict is possible with modem slot 12
GPI functionality.
AC ’97 2.2 compliant controllers will not likely support audio codec interrupt infrastructure. In that case, S/W could poll the
interrupt status after initiating a sense cycle and waiting for Sense Cycle Max Delay to determine if an interrupting event has
occurred.
INTERRUPT STATUS (R/W). This bit provides interrupt status and clear capability.
0 = Interrupt is Clear
1 = Interrupt was Generated
Interrupt event is cleared by writing a 1 to this bit. The interrupt bit will change regardless of condition of interrupt enable (I0)
status. An interrupt in the GPI in slot 12 in the ac link will follow this bit change when interrupt enable (I0) is unmasked.
Rev. A | Page 18 of 32
AD1888
Table 27. Power-Down Control/Status Register (Index 26h)
Reg
No.
26h
Name
Power-Down
Control/Status
D15
EAPD
D14
PR6
D13
PR5
D12
PR4
D11
PR3
D10
PR2
D9
PR1
D8
PR0
D7
X
D6
X
D5
X
D4
X
D3
REF
D2
ANL
D1
DAC
D0
ADC
Default
NA
The ready bits are read only; writing to REF, ANL, DAC, ADC will have no effect. These bits indicate the status for the AD1888 subsections. If the bit is a 1, then that
subsection is ready. Ready is defined as the subsection able to perform in its nominal state. All registers not shown and bits containing an X are assumed to be reserved.
ADC
DAC
ANL
REF
PR[6:0]
EAPD
ADC Sections Ready to Transmit Data
DAC Sections Ready to Transmit Data
Analog Amplifiers, Attenuators, and Mixers Ready
Voltage References, VREF and VREFOUT, up to Nominal Level
Codec Power-Down Modes. The first three bits are to be used individually rather than in combination with each other. PR3 can be
used in combination with PR2 or by itself. The mixer and reference cannot be powered down via PR3 unless the ADCs and DACs
are also powered down. Nothing else can be powered up until the reference is up. PR5 has no effect unless all ADCs, DACs, and the
ac-link are powered down. The reference and the mixer can be either up or down, but all power-up sequences must be allowed to
run to completion before PR5 and PR4 are both set. In multiple codec systems, the master codec’s PR5 and PR4 bits control the
slave codec. PR5 is also effective in the slave codec if the master’s PR5 bit is clear, but the PR4 bit has no effect except to enable or
disable PR5.
External Audio Power-Down Control. Controls the state of the EAPD pin.
EAPD = 0 sets the EAPD pin low, enabling an external power amplifier (reset defaults).
EAPD = 1 sets the EAPD pin high, shutting off the external power amplifier.
Rev. A | Page 19 of 32
AD1888
PR1 = 1
ADCs OFF
PR0
NORMAL
PR2 = 1
ANALOG
OFF
PR2 OR
PR3
DACs OFF
PR1
PR1 = 0
AND
DAC = 1
PR0 = 0
AND
ADC = 1
PR4 = 1
DIGITAL I/F
OFF
PR4
PR2 = 0
AND
ANL = 1
SHUT OFF
AC-LINK
WARM
RESET
COLD
RESET
READY = 1
DEFAULT
04294-010
PR0 = 1
Figure 10. One Example of AC ’97 Power-Down/Power-Up Flow
Table 28. Extended Audio ID Register (Index 28h)
Reg
No.
28h
Name
Ext’d
Audio
ID
D15
ID1
D14
ID0
D13
X
D12
X
D11
REV1
D10
REV0
D9
AMAP
D8
LDAC
D7
SDAC
D6
CDAC
D5
DSA1
D4
DSA0
D3
X
D2
SPDIF
D1
DRA
D0
VRA
Default
x3C7h
The extended audio ID register identifies which extended audio features are supported. A nonzero extended audio ID value indicates one or more of the extended
audio features are supported. All registers not shown and bits containing an X are assumed to be reserved.
VRA
DRA
SPDIF
DSA[1,0]
CDAC
SDAC
LDAC
AMAP
REV[1,0]
ID[1:0]
Variable Rate PCM Audio Support (Read Only).
This bit returns a 1 when read to indicate that the Variable Rate PCM Audio is supported.
Double Rate Audio (Read Only).
This bit returns a 1 when read to indicate that the optional Double Rate RCM Audio is supported for PCM L and PCM R.
SPDIF Support (Read Only). This bit returns a 1 when read to indicate that the SPDIF transmitter is supported (IEC958).
This bit is also used to validate that the SPDIF transmitter output is actually enabled. The SPDIF bit is only allowed to be set high
if the SPDIF pin (48) is pulled down at power-up, enabling the codec transmitter logic. If the SPDIF pin is floating or pulled high
at power-up, the transmitter logic is disabled and therefore this bit returns a low, indicating that the SPDIF transmitter is not
available. This bit must always be read back to verify that the SPDIF transmitter is actually enabled.
DAC Slot Assignments (Read/Write) (Reset Default = 00)
00 DACs 1, 2 = 3 and 4
DACs 3, 4 = 7 and 8
DACs 5, 6 = 6 and 9
01 DACs 1, 2 = 7 and 8
DACs 3, 4 = 6 and 9
DACs 5, 6 = disabled
10 DACs 1, 2 = 6 and 9
DACs 3, 4 = disabled
DACs 5, 6 = disabled
11 Reserved
PCM CENTER DAC Support (Read Only).
This bit returns a 1 when read to indicate that PCM center DAC is supported.
PCM Surround DAC Support (Read Only).
This bit returns a 1 when read to indicate that PCM surround left and right DACs are supported.
PCM LFE DAC Support (Read Only),
This bit returns a 1 when read to indicate that PCM LFE DAC is supported.
Slot DAC Mappings Based on Codec ID (Read Only).
This bit returns a 1 when read to indicate that slot/DAC mappings based on codec ID are supported.
REV[1,0] = 01 indicates codec is AC ’97 revision 2.2 compliant (Read Only).
Indicates Codec Configuration (Read Only).
00 = Primary
01, 10, 11 = Secondary
Rev. A | Page 20 of 32
AD1888
Table 29. Extended Audio Status and Control Register (Index 2Ah)
Reg
No.
2Ah
Name
Extended
Audio
Stat/Ctrl
D15
VFORCE
D14
X
D13
PRK
D12
PRJ
D11
PRI
D10
SPCV
D9
X
D8
ELDAC
D7
ESDAC
D6
ECDAC
D5
SPSA1
D4
SPSA0
D3
X
D2
ESPDIF
D1
EDRA
D0
EVRA
The extended audio status and control register is a read/write register that provides status and control of the extended audio features. All registers not shown and bits
containing an X are assumed to be reserved.
EVRA
EDRA
ESPDIF
SPSA[1,0]
ECDAC
ESDAC
ELDAC
SPCV
PRI
PRJ
PRK
VFORCE
Variable Rate Audio (Read/Write).
EVRA = 0, sets fixed sample rate audio at 48 kHz (Reset Default).
EVRA = 1, enables variable rate audio mode (enables sample rate registers and SLOTREQ signaling).
Double Rate Audio.
EDRA = 1 enables double rate audio mode in which data from PCM L and PCM R in output slots 3 and 4 is used in conjunction
with PCM L (n + 1) and PCM R (n + 1) data to provide DAC streams at twice the sample rate designated by the PCM front sample
rate control register. When using the double rate audio, only the front DACs are supported and all other DACs (surround, center,
and LFE) are automatically powered down. Note that EDRA can be used without VRA; in that case, the converter rates are forced
to 96 kHz if EDRA = 1.
SPDIF Transmitter Subsystem Enable/Disable Bit (Read/Write).
ESPDIF = 1 enables the SPDIF transmitter.
ESPDIF = 0 disables the SPDIF transmitter (default).
SPDIF Slot Assignment Bits (Read/Write).
These bits control the SPDIF slot assignment and respective defaults, depending on the codec ID configuration. See the
following table.
Center DAC Status (Read Only).
ECDAC = 1 indicates the PCM center DAC is ready.
Surround DAC status (Read Only).
ESDAC = 1 indicates the PCM surround DACs are ready.
LFE DAC status (Read Only).
ELDAC = 1 indicates the PCM LFE DAC is ready.
SPDIF Configuration Valid (Read Only). Indicates the status of the SPDIF transmitter subsystem, enabling the driver to
determine if the currently programmed SPDIF configuration is supported. SPCV is always valid, independent of the SPDIF
enable bit status.
SPCV = 0 indicates current SPDIF configuration (SPSA, SPSR, DAC slot rate, DRS) is not valid (not supported).
SPCV = 1 indicates current SPDIF configuration (SPSA, SPSR, DAC slot rate, DRS) is valid (supported).
Center DAC Power-Down (Read/Write).
PRI = 1 turns off the PCM Center DAC.
Surround DACs Power-Down (Read/Write).
PRJ = 1 turns off the PCM surround DACs.
LFE DAC Power-Down (Read/Write).
PRK = 1 turns off the PCM LFE DAC.
Validity Force Bit (Reset Default = 0).
When asserted, this bit forces the SPDIF stream validity flag (Bit 28 within each SPDIF L/R subframe) to be con-trolled by the V
bit (D15) in Register 3Ah (SPDIF control register).
VFORCE = 0 and V = 0; the Validity Bit is managed by the codec error detection logic.
VFORCE = 0 and V = 1; the Validity Bit is forced high, indicating subframe data is invalid.
VFORCE = 1 and V = 0; the Validity Bit is forced low, indicating subframe data is valid.
VFORCE = 1 and V = 1; the Validity Bit is forced high, indicating subframe data is invalid.
Rev. A | Page 21 of 32
Default
0xx0h
AD1888
Table 30. AC ’97 2.2 AMAP Compliant Default SPDIF Slot Assignments
Codec ID
00
00
00
01
01
10
10
11
Function
2-Ch Primary w/SPDIF
4-Ch Primary w/SPDIF
6-Ch Primary w/SPDIF
+2-Ch Secondary w/SPDIF
+4-Ch Secondary w/SPDIF
+2-Ch Secondary w/SPDIF
+4-Ch Secondary w/SPDIF
+2-Ch Secondary w/SPDIF
SPSA = 00
3 and 4
3 and 4
3 and 4
3 and 4
3 and 4
3 and 4
3 and 4
3 and 4
SPSA = 01
7 and 8 [default]
7 and 8
7 and 8
7 and 8
7 and 8
7 and 8
7 and 8
7 and 8
SPSA = 10
6 and 9
6 and 9[default]
6 and 9
6 and 9[default]
6 and 9
6 and 9[default]
6 and 9
6 and 9
SPSA = 11
10 and 11
10 and 11
10 and 11[default]
10 and 11[default]
10 and 11[default]
10 and 11[default]
Table 31. PCM Front DAC Rate Register (Index 2Ch)
Reg
No.
2Ch
Name
PCM Front
DAC Rate
D15
SRF15
D14
SRF14
D13
SRF13
D12
SRF12
D11
SRF11
D10
SRF10
D9
SRF9
D8
SRF8
D7
SRF7
D6
SRF6
D5
SRF5
D4
SRF4
D3
SRF3
D2
SRF2
D1
SRF1
D0
SRF0
Default
BB80h
This read/write Sample Rate Control Register contains 16-bit unsigned value, representing the rate of operation in Hz.
SRF[15:0]
Sample Rate
The sampling frequency range is from 7 kHz (1B58h) to 48 kHz (BB80h) in 1 Hz increments. If zero is written to EVRA, the sample
rate is reset to 48 kHz.
Table 32. PCM Surround DAC Rate Register (Index 2Eh)
Reg
No.
2Eh
Name
PCM
Surr
DAC
Rate
D15
SRS15
D14
SRS14
D13
SRS13
D12
SRS12
D11
SRS11
D10
SRS10
D9
SRS9
D8
SRS8
D7
SRS7
D6
SRS6
D5
SRS5
D4
SRS4
D3
SRS3
D2
SRS2
D1
SRS1
D0
SRS0
Default
BB80h
This read/write Sample Rate Control Register contains 16-bit unsigned value, representing the rate of operation in Hz.
This register sets the sample rate for the surround DAC. This register’s reset default is to be locked to the PCM front DAC sample rate register (2-Ch).
To unlock this register, Bit SRU in Register 76h must be asserted.
SRF[15:0]
Sample Rate
The sampling frequency range is from 7 kHz (1B58h) to 48 kHz (BB80h) in 1 Hz increments. If zero is written to EVRA, the
sample rate is reset to 48 kHz.
Table 33. PCM LFE (and CENTER) DAC Rate Register (Index 30h)
Reg
No.
30h
Name
D15
D14
D13
D12
D11
D10
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
Default
PCM
LFE/C
DAC
Rate
SRCL15
SRCL14
SRCL13
SRCL12
SRCL11
SRCL10
SRCL9
SRCL8
SRCL7
SRCL6
SRCL5
SRCL4
SRCL3
SRCL2
SRCL1
SRCL0
BB80h
This read/write sample rate control register contains 16-bit unsigned value, representing the rate of operation in Hz.
This register sets the sample rate for the LFE DAC and Center DAC. This register’s reset default is to be locked to the PCM Front DAC sample rate register (2-Ch)
To unlock the register bit, SRU in Register 76h must be asserted.
SRF[15:0]
Sample Rate
The sampling frequency range is from 7 kHz (1B58h) to 48 kHz (BB80h) in 1 Hz increments. If zero is written to EVRA, the
sample rate is reset to 48 kHz.
Rev. A | Page 22 of 32
AD1888
Table 34. PCM ADC Rate Register (Index 32h)
Reg
No.
32h
Name
PCM L/R
ADC
Rate
D15
SRA15
D14
SRA14
D13
SRA13
D12
SRA12
D11
SRA11
D10
SRA10
D9
SRA9
D8
SRA8
D7
SRA7
D6
SRA6
D5
SRA5
D4
SRA4
D3
SRA3
D2
SRA2
D1
SRA1
D0
SRA0
Default
BB80h
This read/write sample rate control register contains 16-bit unsigned value, representing the rate of operation in Hz.
SRF[15:0]
Sample Rate
The sampling frequency range is from 7 kHz (1B58h) to 48 kHz (BB80h) in 1 Hz increments. If zero is written to EVRA, the
sample rate is reset to 48 kHz.
Table 35. CENTER/LFE Volume Control Register (Index 36h)
Reg
No.
36h
Name
Center/LFE
Volume
D15
LM
D14
X
D13 1
LFE5
D12
LFE4
D11
LFE3
D10
LFE2
D9
LFE1
D8
LFE0
D7
CM
D6
X
D51
CNT5
D4
CNT4
D3
CNT3
D2
CNT2
D1
CNT1
D0
CNT0
Default
8080h
1
Because AC ’97 defines 6-bit volume registers, to maintain compatibility, whenever the D5 or D13 bit is set to 1, its respective lower five volume bits are automatically
set to 1 by the codec logic. On readback, all lower five bits will read 1s whenever this bit is set to 1.
All registers not shown and bits containing an X are assumed to be reserved.
Refer to Table 36 for examples. This register controls the LFE output volume and mute bit. The volume registers contain five bits, generating 32 volume levels with 31
steps of 1.5 dB each. If MSPLT is not set, Bit D7 has no effect.
Note that depending on the state of the AC97NC bit in Register 76h, this register operates as follows:
For AC97NC = 0, the register controls the center and LFE output pin attenuators. Range is 0 dB to −46.5 dB.
For AC97NC = 1, the register controls the center and LFE DAC gain/attenuators. Range is +12 dB to −34.5 dB.
CNT[5:0]
CM
LFE[5:0]
LM
Center Volume Control
Center Volume Mute. When this bit is set to 1, the channel is muted.
LFE Volume Control
LFE Volume Mute. When this bit is set to 1, the channel is muted.
Table 36. Settings for Center/LFE Register
Control Bits
CENTER and LFE Volume (36h)
D15/D7
0
0
0
0
1
CENTER D[5:0] and LFE D[13:8]
WRITE
READBACK
00 0000
00 0000
00 1111
00 1111
01 1111
01 1111
1x xxxx
01 1111
xx xxxx
xx xxxx
Function with AC97NC = 0
0 dB Gain
−22 dB Gain
−46.5 dB Gain
−46.5 dB Gain
Muted
Function with AC97NC = 1
12 dB Gain
−10.5 dB Gain
−34.5 dB Gain
Not Applicable
Muted
Table 37. Surround Volume Control Register (Index 38h)
Reg
No.
38h
1
Name
Surround
Volume
D15
MUTE_L
D14
X
D13 1
LSR5
D12
LSR4
D11
LSR3
D10
LSR2
D9
LSR1
D8
LSR0
D7
MUTE_R
D6
X
D51
RSR5
D4
RSR4
D3
RSR3
D2
RSR2
D1
RSR1
D0
RSR0
Default
8080h
Refer to Table 37 for examples. This register controls the surround volume controls for both stereo channels and mute bits. Each volume subregister contains five bits,
generating 32 volume levels with 31 steps of 1.5 dB each. Because AC ’97 defines 6-bit volume registers, to maintain compatibility, whenever the D5 or D13 Bit is set to
1, its respective lower five volume bits are automatically set to 1 by the coded logic. On readback , all lower five bits will read 1s whenever these bits are set to 1.
Note that depending on the state of the AC97NC bit in Register 76h, this register operates as follows:
For AC97NC = 0, the register controls the surround output pin attenuators. Range is 0 dB to −46.5 dB.
For AC97NC = 1, the register controls the surround DAC gain/attenuators. Range is +12 dB to −34.5 dB.
RSR[5:0]
MUTE_R
LSR[5:0]
MUTE_L
Right Surround Volume Control
Right Surround Volume Mute. When this bit is set to 1, the right channel is muted.
Left Surround Volume Control
Left Surround Volume Mute. When this bit is set to 1, the left channel is muted.
Rev. A | Page 23 of 32
AD1888
Table 38. Settings for Surround Register
Control Bits
Surround Volume (38h)
Left Surround D[13:8]
Right Surround D[5:0]
WRITE
READBACK
00 0000
00 0000
00 1111
00 1111
01 1111
01 1111
1x xxxx
01 1111
xx xxxx
xx xxxx
D15/D7
0
0
0
0
1
Function with AC97NC = 0
0 dB Gain
−22 dB Gain
−46.5 dB Gain
−46.5 dB Gain
Muted
Function with AC97NC = 1
12 dB Gain
−10.5 dB Gain
−34.5 dB Gain
Not Applicable
Muted
Table 39. SPDIF Control Register (Index 3Ah)
Reg
No.
3Ah
Name
SPDIF
Control
D15
V
D14
X
D13
SPSR1
D12
SPSR0
D11
L
D10
CC6
D9
CC5
D8
CC4
D7
CC3
D6
CC2
D5
CC1
D4
CC0
D3
PRE
D2
COPY
D1
/AUD
D0
PRO
Default
2000h
All registers not shown and bits containing an X are assumed to be reserved.
Register 3Ah is a read/write register that controls SPDIF functionality and manages bit fields propagated as channel status (or subframe in the V case). With the
exception of V, this register should only be written to when the SPDIF transmitter is disabled (SPDIF Bit in Register 2Ah is 0). This ensures that control and status
information starts up correctly at the beginning of SPDIF transmission.
PRO
/AUD
COPY
PRE
CC[6-0]
L
SPSR[1,0]
V
Professional. 1 indicates professional use of channel status, 0 indicates consumer.
Non-Audio. 1 indicates data is non PCM format, 0 indicates data is PCM.
Copyright. 1 indicates copyright is asserted, 1 indicates copyright is not asserted.
Pre-emphasis. 1 indicates filter pre-emphasis is 50 μs/15 μs, 0 indicates pre-emphasis is none.
Category Code. Programmed according to IEC standards, or as appropriate.
Generation Level. Programmed according to IEC standards, or as appropriate.
SPDIF Transmit Sample Rate:
SPSR[1:0] = 00 Transmit Sample Rate = 44.1 kHz
SPSR[1:0] = 01 Reserved
SPSR[1:0] = 10 Transmit Sample Rate = 48 kHz (default)
SPSR[1:0] = 11 Not supported.
Validity. This bit affects the Validity flag (Bit 28 transmitted in each SPDIF L/R subframe) and enables the SPDIF transmitter to
maintain connection during error or mute conditions.
V = 1 Each SPDIF subframe (L + R) has Bit 28 set to 1. This tags both samples as invalid.
V = 0 Each SPDIF subframe (L + R) has Bit 28 set to 0 for valid data and 1 for invalid data (error condition).
Note that when V = 0, asserting the VFORCE bit (D15) in Register 2Ah (Ext’d Audio Stat/Ctrl) will force the Validity flag low,
marking both samples as valid.
Rev. A | Page 24 of 32
AD1888
Table 40. Jack Sense/Audio Interrupt Status Register (Index 72h)
Reg
No.
72h
Name
Jack
Sense
D15
JS1
SPRD
D14
JS1
DMX
D13
JS0
DMX
D12
JS
MT2
D11
JS
MT1
D10
JS
MT0
D9
X
D8
X
D7
JS1
TMR
D6
JS0
TMR
D5
JS1
MD
D4
JS0
MD
D3
JS1
ST
D2
JS0
ST
D1
JS1
INT
D0
JS0
INT
Default
0000h
All register bits are read/write except for JS0ST and JS1ST, which are read only.
JS0INT
JS1INT
JS0ST
JS1ST
JS0MD
JS1MD
JS0TMR
JS1TMR
JSMT[2,0]
JS0DMX
JS1DMX
JS1SPRD
Indicates Pin JS0 has generated an interrupt. Remains set until the software services JS0 interrupt, i.e., JS0 ISR should clear this
bit by writing a 0 to it. Note that the interrupt to the system is actually an OR combination of this bit and JS1INT. Also, note that
the actual interrupt implementation is selected by the INTS bit (Register 76h).
It is also possible to generate a software system interrupt by writing a 1 to this bit.
Indicates Pin JS1 has generated an interrupt. Remains set until the software services JS1 interrupt, i.e., JS1 ISR should clear this
bit by writing a 0 to it. See the JS0INT description for additional details.
JS0 STATE. This bit always reports the logic state of the JS0 pin.
JS1 STATE. This bit always reports the logic state of the JS1 pin.
JS0 Mode. This bit selects the operation mode for the JS0 pin.
0 = Jack Sense Mode (reset default)
1 = Interrupt Mode
JS1 Mode. This bit selects the operation mode for the JS1 pin.
0 = Jack Sense Mode (reset default)
1 = Interrupt Mode
JS0 Timer Enable. If this bit is set to a 1, JS0 must be high for greater than 278 ms to be recognized.
JS1 Timer Enable. If this bit is set to a 1, JS1 must be high for greater than 278 ms to be recognized.
JS Mute Enable Selector. These three bits select and enable the Jack Sense muting action (see Table 41).
JS0 Down Mix Control Enable. This bit enables JS0 to control the down-mix function. This function allows a digital mix of six
channels of audio into 2-channel audio. The mix can then be routed to the stereo Line_OUT or HP_OUT jacks. When this bit is
set to 1, JS0 = 1 will activate the down-mix conversion. See the DMIX description in Register 76h. The DMIX bits select the
down-mix implementation type and can also force the function to be activated.
JS1 Down Mix Control Enable. This bit enables 2-channel to 6-channel audio spread function when both Jack Senses are active
(logic state 1).
Note that the SPRD bit can also force the spread function without being gated by the Jack Senses. See this bit’s description in
Register 76h for a better understanding of the spread function.
JS Spread Control Enable. This bit enables 2-channel to 6-channel audio spread function when both Jack Senses are active
(logic state 1).
Note that the SPRD bit can also force the spread function without being gated by the Jack Senses. See this bit’s description in
Register 76h for a better understanding of the spread function.
Rev. A | Page 25 of 32
AD1888
Table 41. Jack Sense Mute Select (JSMT [2:0])
JS1
NA
OUT (0)
OUT (0)
IN (1)
IN (1)
OUT (0)
OUT (0)
IN (1)
IN (1)
JS0
NA
OUT (0)
IN (1)
OUT (0)
IN (1)
OUT (0)
IN (1)
OUT (0)
IN (1)
JSMT2
0
0
0
0
0
1
1
1
1
JSMT1
0
0
0
0
0
0
0
0
0
JSMT0
0
1
1
1
1
0
0
0
0
HP OUT
ACTIVE
ACTIVE
ACTIVE
ACTIVE
ACTIVE
ACTIVE
ACTIVE
ACTIVE
ACTIVE
LINE OUT
ACTIVE
FMUTE
FMUTE
ACTIVE
ACTIVE
FMUTE
ACTIVE
FMUTE
FMUTE
C/LFE OUT
ACTIVE
FMUTE
FMUTE
ACTIVE
ACTIVE
FMUTE
ACTIVE
FMUTE
FMUTE
MONO OUT
ACTIVE
ACTIVE
ACTIVE
ACTIVE
ACTIVE
ACTIVE
FMUTE
FMUTE
FMUTE
OUT (0)
OUT (0)
IN (1)
IN (1)
NA
NA
NA
OUT (0)
IN (1)
OUT (0)
IN (1)
NA
NA
NA
1
1
1
1
1
1
0
0
0
0
0
1
1
1
1
1
1
1
0
1
1
FMUTE
FMUTE
ACTIVE
ACTIVE
**
**
**
FMUTE
FMUTE
ACTIVE
ACTIVE
**
**
**
FMUTE
FMUTE
ACTIVE
ACTIVE
**
**
**
ACTIVE
FMUTE
FMUTE
FMUTE
**
**
**
FMUTE = Output is forced to mute independent of the respective Volume register setting.
ACTIVE = Output is not muted and its status is dependent on the respective Volume register setting.
OUT = Nothing plugged into the jack and therefore the JS status is 0 (via the load resistor pull-down).
IN = Jack has plug inserted and therefore the JS status is 1 (via the codec JS internal pull-up).
Rev. A | Page 26 of 32
Notes
JS0 and JS1 ignored.
JS0 no mute action,
JS1 mutes mono and enables
LINE_OUT and C/LFE.
Standard 6-channel config.
JS0 = 0 and JS1 = 0 enables mono.
JS1 = 1 enables front only
JS0 = 1 enables all rear.
6-chan config with front jack
wrapback.
JS0 no mute action, JS1 mutes
mono and enables LINE_OUT
+ HP_OUT + C/LFE.
Standard 6-channel config.
** Reserved
** Reserved
** Reserved
AD1888
Table 42. Serial Configuration Register (Index 74h)
Reg
No.
74h
Name
Serial
Config
SPLNK
SPDZ
SPAL
INTS
LBKS[1:0]
CHEN
DRF
REGM3
REGM0
REGM1
REGM2
SLOT16
D15
SLOT16
D14
REGM2
D13
REGM1
D12
REGM0
D11
REGM3
D10
DRF
D9
X
D8
CHEN
D7
X
D6
LBKS1
D5
LBKS0
D4
INTS
D3
X
D2
SPAL
D1
SPDZ
D0
SPLNK
Default
1001h
SPDIF Link. This bit enables the SPDIF to link with the front DACs for data requesting.
0 = SPDIF and DAC are not linked.
1 = SPDIF and DAC are linked and receive the same data requests (reset default).
SPDIF DACZ.
0 = Repeat last sample out of the SPDIF stream if FIFO underruns (reset default).
1 = Forces midscale sample out the SPDIF stream if FIFO underruns.
SPDIF ADC Loop-Around.
0 = SPDIF transmitter is connected to the AC-Link stream (reset default).
1= SPDIF transmitter is connected to the digital ADC stream, not the AC-Link.
Interrupt Mode Select. This bit selects the JS interrupt implementation path.
0 = Bit 0 SLOT 12 (modem interrupt) (reset default).
1 = Slot 6 Valid Bit (MIC ADC interrupt).
Loop-Back Selection. These bits select the internal digital loop-back path when LPBK bit is active (see Register 20h)
00 = Loop-back through the front DACs (reset default).
01 = Loop-back through the surround DACs.
10 = Reserved
11 = Loop-back through the center and LFE DACs (center DAC loops back from the ADC left channel, the LFE DAC from the ADC
right channel).
Chain Enable. This bit enables chaining of a slave codec SDATA_IN stream into the ID0 pin (Pin 45).
0 = Disable chaining (reset default).
1 = Enable chaining into ID0 pin.
DAC Request Force. This allows the AD1888 to synchronize DAC requests with the AD1981A/B.
0 = Normal DAC requesting sequence (reset default).
1 = Synchronize to AD1981A/B DAC requests.
Slave 3 Codec Register Mask
Master Codec Register Mask
Slave 1 Codec Register Mask
Slave 2 Codec Register Mask
Enable 16-Bit Slot Mode. SLOT16 makes all ac-link slots 16 bits in length, formatted into 16 slots. This is a preferred mode for
DSP serial port interfacing.
Rev. A | Page 27 of 32
AD1888
Table 43. Miscellaneous Control Bit Register (Index 76h)
Reg
No.
76h
Name
Misc
Control
Bits
MBG[1:0]
VREFD
VREFH
SRU
LOSEL
SPRD
D15
DACZ
D14
AC97NC
D13
MSPLT
D12
LODIS
D11
CLDIS
D10
HPSEL
D9
DMIX1
D8
DMIX0
D7
SPRD
D6
X
D5
LOSEL
D4
SRU
D3
VREFH
D2
VREFD
D1
MBG1
D0
MBG0
Default
0000h
MIC Boost Gain Select Register.
These two bits allow changing the MIC preamp gain from the nominal 20 dB gain. Both MIC1/MIC2 and MIC2 preamps will be
set to the same selected gain.
Note that this gain takes effect only while Bit D6 (M20) on the MIC volume register (0Eh) is set to 1; otherwise, the MIC boost
block has a gain of 0 dB.
00 = 20 dB gain (reset default)
01 = 10 dB gain
10 = 30 dB gain
11 = reserved
VREFOUT Disable. Disables VREFOUT, placing it into High-Z out mode.
Note that this bit overrides the VREFH bit selection (see below).
0 = VREFOUT pin is driven by the internal reference (reset default).
1 = VREFOUT pin is placed into High-Z out mode.
VREFOUT High. Changes VREFOUT from 2.25 V to 3.70 V for PC2001 compliant MIC bias applications.
0 = VREFOUT pin is set to 2.25 V output (reset default).
1 = VREFOUT pin is set to 3.70 V output.
Sample Rate Unlock. Controls DAC sample rate locking.
0 = All DAC sample rates are locked to the front sample rate (reset default)
1 = DAC sample rates can be set independently for front, surround, and LFE.
LINE_OUT Amplifiers Input Select. This bit allows the LINE_OUT output amplifiers to be driven by the mixer or the surround
DACs. The main purpose for this is to allow swapping of the front and surround channels to make better use of the
SURR/HP_OUT output amplifiers. This bit should normally be used in tandem with the HPSEL bit (see below).
0 = LINE_OUT amplifiers are driven by the mixer outputs (reset default).
1 = LINE_OUT amplifiers are driven by the surround DAC outputs.
SPREAD Enable. This bit enables spreading of 2-channel media to all six output channels. This function is implemented in the
analog section by using the output selector controls line for the center/LFE, surround, and Line_out output channels. Note that
the Jack Sense pins can also be set up to control (gate) this function, depending on the JSSPRD bit (see Register 72h).
0 = No spreading occurs unless activated by the Jack Senses and JSSPRD bits (reset default).
1 = The SPRD selector drives the center and LFE outputs from the MONO_OUT, the HPSEL selector drives the SURR/HP_OUT
outputs from the mixer outputs, and the LOSEL selector drives the LINE_OUT outputs also from the mixer outputs.
Note that the SPRD bit overrides the current output selector control lines set up by bits LOSEL and HPSEL as follows: LOSEL = 0
and HPSEL = 1.
Rev. A | Page 28 of 32
AD1888
DMIX[1:0]
HPSEL
CLDIS
LODIS
MSPLT
AC97NC
DACZ
Down Mix Mode Select. Provides analog down-mixing of the center, LFE, and/or surround channels into the mixer channels.
This allows the full content of 5.1 or quad media to be played through stereo headphones or speakers.
Note that the Jack Sense pins can also be set up to control (gate) this function depending on the JS0DMX and JS1DMX Bits (see
Register 72h).
The upper bit allows forcing the down-mix function:
DMIX[1] = 0, no down-mix unless activated by the Jack Sense and JSxDMX bits (default).
DMIX[1] = 1, forces down-mix function.
The lower bit selects the down-mix type:
DMIX[0] = 0, selects 6-to-4 down-mix. The center and LFE channels are summed equally into the mixer left and right channels
(default).
DMIX[0] = 1, selects 6-to-2 down-mix. The surround left and right channels are summed into the mixer left and right channels.
Default for DMIX[1:0] is 00.
Headphone Amplifier Input Select. This bit allows the headphone power amps to be driven from the surround DACs or from
the mixer outputs. There are two reasons for this: one is to allow 2-channel media to use the higher power headphone
amplifiers available on the SURR/HP_OUT outputs; the other is to allow spreading of 2-channel media to the surround outputs.
Together with the LOSEL bit (see above), this bit also provides for analog swapping of the mixer (front) and surround outputs.
0 = SURR_OUT/HP_OUToutputs are driven by the surround DACs (reset default).
1 = SURR_OUT/HP_OUToutputs are driven by the mixer outputs.
Center and LFE Disable. Disables the center and LFE output pins, placing them into High-Z mode so that the assigned output
audio jack(s) can be shared for MIC inputs or other functions.
0 = Center and LFE output pins have normal audio drive capability (reset default).
1 = Center and LFE output pins are placed into High-Z mode.
Line_out Disable. Disables the Line_out pins (L/R), placing them into High-Z mode so that the assigned output audio jack can
be shared for Line Input function.
0 = Line_out pins have normal audio drive capability (reset default).
1 = Line_out pins are placed into High-Z mode.
Mute Split. Allows separate mute control bits for master, HP, Line_in, CD, PCM OUT, and record volume/gain control registers.
0 = Both left and right channel mutes are controlled by Bit D15 in the respective registers (reset default).
1 = Bit D15 affects only the left channel mute and Bit D7 affects only the right channel mute.
AC ’97 No Compatibility Mode. This bit allows the surround, center, and LFE volume control registers and output attenuators to
operate in a more functional mode than defined by the AC97 2.2 spec. This is called ADI compatibility mode.
In AC ’97 compatibility mode, the DAC gain/attenuators for the surround, center, and LFE are controlled by Register 18h (PCM
volume). The output pin attenuators for the surround are controlled by Register 38h, and the output pin attenuators for the
center and LFE are controlled by Register 36h.
In ADI compatibility mode, the Surround DAC gain/attenuators are controlled by Register 38h, and the Center/LFE DACs are
controlled by Register 36h.
The output pin attenuators for Center/LFE are controlled by Register 02h (Master Volume), and the output pin attenuators for
Surround are controlled by Register 04h.
0 = AC97 compatibility mode (reset default).
1 = ADI compatibility mode.
DAC Zero-Fill. Determines DAC data fill under starved condition.
0 = DAC data is repeated when DACs are starved for data (reset default).
1 = DAC data is zero-filled when DACs are starved for data.
Rev. A | Page 29 of 32
AD1888
Table 44. Vendor ID Register (Index 7Ch–7Eh)
Reg No.
7Ch
Name
Vendor ID1
D15
F7
S[7:0]
F[7:0]
Reg
No.
7Eh
D14
F6
D13
F5
D12
F4
D11
F3
D10
F2
D9
F1
D8
F0
D7
S7
D6
S6
D5
S5
D4
S4
D3
S3
D2
S2
D1
S1
D0
S0
Default
4144h
D0
REV0
Default
5368h
This register is ASCII encoded to A.
This register is ASCII encoded to D.
Name
Vendor
ID2
T[7:0]
REV[7:0]
D15
T7
D14
T6
D13
T5
D12
T4
D11
T3
D10
T2
D9
T1
D8
T0
D7
REV7
D6
REV6
D5
REV5
D4
REV4
D3
REV3
D2
REV2
D1
REV1
This register is ASCII encoded to S.
This register is set to 68h identifying the AD1888.
Table 45. Codec ID and Clock Selection Table
XTL_IN
GND
GND
GND
XTAL into XTL_IN
CLK INPUT
CLK INPUT
CLK INPUT
ID1#
0
0
1
1
0
0
1
ID0#
0
1
0
1
0
1
X
Codec ID
SECONDARY, ID = 3
SECONDARY, ID = 2
SECONDARY, ID = 1
PRIMARY, ID = 0
PRIMARY, ID = 0
PRIMARY, ID = 0
RESERVED
Note that internally, the ID pins have weak pull-ups and are inverted.
Rev. A | Page 30 of 32
Codec Clocking Source
12.288 MHz (BIT_CLK from Primary Codec)
12.288 MHz (BIT_CLK from Primary Codec)
12.288 MHz (BIT_CLK from Primary Codec)
24.576 MHz Local XTAL or External CLK
14.3181 MHz (External into XTL_IN)
48.00 MHz (External into XTL_IN)
RESERVED
AD1888
OUTLINE DIMENSIONS
0.75
0.60
0.45
9.00
BSC SQ
1.60
MAX
37
48
36
1
PIN 1
7.00
BSC SQ
TOP VIEW
1.45
1.40
1.35
0.15
0.05
(PINS DOWN)
0.20
0.09
7°
3.5°
0°
0.08 MAX
COPLANARITY
SEATING
PLANE
25
12
13
24
0.27
0.22
0.17
VIEW A
0.50
BSC
LEAD PITCH
VIEW A
ROTATED 90° CCW
COMPLIANT TO JEDEC STANDARDS MS-026-BBC
Figure 11. 48-Lead Low Profile Quad Flat Package [LQFP]
(ST-48)
Dimensions shown in millimeters
7.00
BSC SQ
0.60 MAX
0.60 MAX
37
36
PIN 1
INDICATOR
TOP
VIEW
12° MAX
PIN 1
INDICATOR
48
1
EXPOSED
PAD
6.75
BSC SQ
5.25
5.10 SQ
4.95
(BOTTOM VIEW)
0.50
0.40
0.30
1.00
0.85
0.80
0.30
0.23
0.18
25
24
12
13
0.25 MIN
5.50
REF
0.80 MAX
0.65 TYP
0.05 MAX
0.02 NOM
0.50 BSC
SEATING
PLANE
0.20 REF
COPLANARITY
0.08
COMPLIANT TO JEDEC STANDARDS MO-220-VKKD-2
Figure 12. 48-Lead Lead Frame Chip Scale Package [LFCSP_VQ]
7 mm × 7 mm Body, Very Thin Quad (CP-48-1)
Dimensions shown in millimeters
ORDERING GUIDE
Model
AD1888JST
AD1888JST-REEL
AD1888JSTZ 1
AD1888JSTZ-REEL1
AD1888JCP
AD1888JCP-REEL
AD1888JCPZ1
AD1888JCPZ-REEL1
1
Temperature Range
0°C to 70°C
0°C to 70°C
0°C to 70°C
0°C to 70°C
0°C to 70°C
0°C to 70°C
0°C to 70°C
0°C to 70°C
Package Description
48-Lead LQFP, Tray Version
48-Lead LQFP, Reel Version
48-Lead LQFP, Tray Version
48-Lead LQFP, Reel Version
48-Lead LFCSP_VQ, Tray Version
48-Lead LFCSP_VQ, Reel Version
48-Lead LFCSP_VQ, Tray Version
48-Lead LFCSP_VQ, Reel Version
Z = Pb-free part.
Rev. A | Page 31 of 32
Package Option
ST-48
ST-48
ST-48
ST-48
CP-48-1
CP-48-1
CP-48-1
CP-48-1
AD1888
NOTES
©2005 Analog Devices, Inc. All rights reserved. Trademarks and
registered trademarks are the property of their respective owners.
C04294–0–8/05(A)
T
T
Rev. A | Page 32 of 32