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AD1815
5V; soundComm controller
ANALOG
DEVICES
SoundComm Controller
AD1815
FEATU RES
Supports Applications Written for
SoundBlaster* Pro, AdLIb/OPL3t
Win 3.1, Win 95
Stereo Audio 16-Bit 2A Codec
M PC Level-2/3 M ixer
ISA Plug and Play Compatible
Dual Type F FIFO DMA Support
MPU-401 Compatlble MIDI Port
Integrated v.34, Modem Analog Front End
Integrated Enhanced Digital Game Port
Supports Wavetable Synthesizers
Two I23 Dlgltal Audio Serial Port Inputs
Software & Hardware Volume Control
Integrated FM Compatlble Muslc Synthesizer
Full-Duplex Capture and Playback
Operation at Different Sample Rates
Supports Up to Slx Dlfferent Sample Rates
Slmultaneously
Supports Voice Over Data
1 Hz Resolution Programmable Sample
Rates from 4 kHz to 55.2 kHz
Bldlrectlonal DSP Serial Port
Power Management Modes
Operation from +5 V Supply
Built-ln 24 mA Bus Drivers
100-Pin PQFP Package
PRODUCT OVERVIEW
The AD 1815 SoundCommTM Controller is a single chip Plug
and Play audio subsystem for adding l6-bit stereo audio and
communications support lo personal computers. The AD 1815
is compatible with applications written for SoundBlaster Pro
and AdLib/OPL3. The AD1815 provides an integrated audio
solution for Windows 95, Windows 3.1, DirectSoundt and
multimedia applications. The AD 1815 supports telephony and
advanced audio applications by providing a V.34 compatible
modem analog front end and a serial port linking a companion
media pump or DSP to the subsystem.
The AD1815 on-chip Plug and Play hardware provides configu-
ration services for all integrated logical devices.
FUNCTIONAL BLOCK DIAGRAM
al a' -g
1- 1- O
AD1815
OSCILLATORS
MDM_IN
MIC 0dB/
20dB AGC
SELECTOR
16-BIT
L' A D/A
CONVERTER
G = GAIN
A = A1TENUATE
M = MUTE
MV = MASTER VOLUME
MONOJN
16-BIT
E A D/A
CONVERTER
MDMN_OUT
MDMP_OUT
SoundComm is a trademark of Analog Devices, Inc.
*SoundBlastcr is a registered trademark of Creative Labs.
TAdLib is a trademark of AdLib Multimedia and OPL is a registered
trademark of Yamaha Corporation.
tDirectSound is a trademark of Microsoft Corp.
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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
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
VOL up
MIDI IN
MIDI OUT
SB PRO
REGISTER
MPU-401 GAME POHT
DRO (X)
mo (X)
16-BIT PC_D (7:0)
E A ND
CONVERTER
FORMAT FIFO
PC_A (11 :0)
DA-CK (X)
BCLK (0)
LRCLK (0)
DATA (0)
SYNTH ESIZEH
PARALLEL INTERFACE
FORMAT FIFO
SERIAL PORT (0)
BCLK (1)
LRCLK (1)
DATA (1)
SERIAL PORT (1)
DIGITAL PLL PCLKO
© Analog Devices, Inc., 1996
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 617/329-4700 Fax: 617/326-8703
AD1815
TABLE OF CONTENTS
FEATURES ..................................... 1
PRODUCT OVERVIEW ........................... 1
SPECIFICATIONS ............................... 3
HOST INTERFACE ............................. 15
SERIAL INTERFACES ........................... 18
ISA INTERFACE ................................ 22
APPENDIX A
Additional Plug and Play Programming Information . . . . 41
Plug and Play Key & "Alternate Key" Sequences ....... 42
Reference Designs and Device Drivers ............... 43
FIGURES
Functional Block Diagram ........................... 1
Figure 1. P10 Read Cycle ........................... 7
Figure 2. P10 Write Cycle .......................... 7
Figure 3. DMA Read Cycle ......................... 8
Figure 4. DMA Write Cycle ......................... 8
Figure 5. Codec Transfer ........................... 8
Figure 6. DSP Port Timing .......................... 8
Figure 7. 12S Serial Port Timing ...................... 8
Figure 8. Reset Pulse Width ......................... 8
Pin Configurations ................................ 10
Figure 9. Serial Interface Right-Justified Mode .......... 18
Figure 10. Serial Interface 12S-Justified Mode ........... 18
Figure 11. Serial Interface Left-Justified Mode .......... 18
Figure 12. DSP SerialInterface(Defau1[ Frame Rate) . . . . 21
Figure 13. DSP Serial Interface (User Programmed
Frame Rate) ................................... 21
Figure 14. DSP Serial Port ......................... 22
Figure 15. Codec Transfers ......................... 28
Figurel6. AD1815FrequencyResponsePlols ........... 43
Outline Dimensions ............................... 44
TABLES
Table I. Modem Disabled Timeslot Map .............. 19
Table II. Chip Register Diagram ..................... 22
Table III. Logical Devices and Compatible Plug
and Play Device Drivers .......................... 23
Table IV. Logical Device Configuration ............... 24
Table V. Sound System Direct Registers ............... 24
Table VI. Codec Transfers ......................... 28
Table VII. Indirect Register Map and Reset/Default States 31
Table V111. Sound System Indirect Registers ........... 32
Table 1X. Sound Blaster Pro ISA Bus Register .......... 39
Table X. Adlib ISA Bus Register ..................... 39
Table XI. MIDI ISA Bus Register .................... 40
Table XII. Game Porl ISA Bus Registers .............. 40
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SPBaFltyil'loi%
AD1815
STANDARD TEST CONDITIONS UNLESS
OTHERWISE NOTED
Temperature
Digital Supply (VDD)
Analog Supply(Vcc)
Sample Rate (Fs)
Input Signal
Audio Output Passband
20 Hz to 20 kHz
DAC Tat Conditions
Calibrated
0 dB Attenuation
Input Full Scale
l6-Bit Linear Mode
100 k9 Output Load
Mute Off
Measured at Line Output
ADC Tat Conditions
Modem Output Passband 400 Hz lo 4.2 kHz Calibrated
Vm 5.0 V 0 dB Gain
Vu, 0 V Input -1.0 dB Relative to Full Scale
Line Input Selected
l6-Bit Linear Mode
ANALOG INPUT
Parameter Min Typ Max Units
Full-Scale Input Voltage (RMS Values Assume Sine Wave Input)
MONOJN, LINE, SYNTH, CD, VID 1 V rms
2.83 V p-p
MDhCIN 3.156 Vp-p
MIC with +20 dB Gain (MGE = l) 0.1 V rms
0.283 V p-p
MIC with 0 dB Gain (MGE = 0) 1 V rms
2.83 V p-p
Input Impedance''' 17 k9.
Input Capacitance''' 15 pF
PROGRAMMABLE GAIN AMPLIFIER-ADC
Parameter Min Typ Max Units
Step Size (0 dB to 22.5 dB)
(All Steps Tested) 1.3 1.5 1.7 dB
PGA Gain Range Span 21.5 22.5 23.5 dB
CD, LINE, MICROPHONE, MODEM, SYNTHESIZER, AND VIDEO INPUT ANALOG GAINI
AMPLIFIERSIATTENUATORS
Parameter Min Typ Max Units
CD, LINE, MIC, SYNTH, VID, MDM_IN
Step Size: (All Steps Tested)
+12 dB to-31.5 dB 1.3 1.5 1.7 dB
-3.3 dB to =34.5 dB 1.0 1.5 2.0 dB
Input Gain/Attenuation Range 45.5 46.5 47.5 dB
MONOJN
Step Size 0 dB to -4.5 dB:(AllSteps Tested) 2.6 3.0 3.4 dB
Input Gain/Attenuation Range 43 45 46 dB
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AD1815
DIGITAL DECIMATION AND INTERPOLATION FILTERS*
Parameter Min Typ Max Units
Audio Passband 0 0.4 x Fs Hz
Audio Passband Ripple i009 dB
Audio Transition Band 0.4 X Fs 0.6 X Fs Hz
Audio Stopband 0.6 X Fs 00 Hz
Audio Stopband Rejection 82 dB
Modem Passband 0 0.4 X Fs Hz
Modem Passband Ripple i0.2 dB
Modem Transition Band 0.442 X Fs 0.542 X Fs Hz
Modem Stopband 0.542 X Fs 00 Hz
Modem Stopband Rejection (3 dB RollOffAfter Stop Band Edge) 78 dB
Audio Group Delay 12/Fs sec
Modem Group Delay 18/Fs sec
Group Delay Variation Over Passband 0.0 ps
ANALOG-TO-DIGITAL CONVERTERS
Parameter Min Typ Max Units
Resolution 16 Bits
Audio Dynamic Range (MO dB Input THD+N Referenced to
Full-Scale, A-Weighted) 80 82 dB
Audio THD+N (Referenced to Full Scale) 0.036 %
-7s1 -7() dB
Modem Dynamic Range (-60 dB Input THD+N Referenced to
Full Scale, Fs = 12.8 kHz) 85 89 dB
Modem THD+N (Referenced to Full Scale, Fs = 12.8 kHz) 0.025 %
475 472 dB
Signal-to-Intermodal/I Distortion* (CCIF Method) 85 dB
ADC Crosstalk*
Line Inputs (Input L, Ground R, Read R; Input R, Ground L Read L) -9() -fi() dB
Line to MIC (Input LINE, Ground and Select MIC, Read ADC) -9() -8() dB
Line to SYNTH -9() -8() dB
Line to CD -9() -8() dB
Line to VID -90 -80 dB
Gain Error (Full-Scale Span Relative lo Nominal Inpul Voltage) 110 %
Inlerchanne] Gain Mismatch (Difference ofGain Errors) i1 dB
ADC Offsel Error i5 mV
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