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| CRD4235-6 Advanced Product Databook FEATURES s MPC3 compliant (with enhancements), Windows Sound SystemTM, DOS Games and AdLibTM compatible s Low Cost Two-Sided Board that Maintains Quality s Crystal Single-Chip CS9236 Wavetable Music Synthesizer s Design accepts the CS4235 , or CS4236B, CS4237B, CS4238B family of devices with simple Bill-of-Material changes s Jumper selectable output amplifier option. Switch between a high quality headphone capable amplifier, or a speaker driver. s MODEM audio connection for Audio Telephony Applications (Requires a separate Modem Card) s Fully Plug-and-Play Compliant CrystalClearTM 16-bit Low-Cost Audio Adapter Reference Design DESCRIPTION The CD-quality CRD4235-6 reference design is fully MPC3 compliant, Ad Lib, DOS Games and Windows Sound System compatible. The design is a half size two-sided ISA-bus PC adapter board, based on the CS4235 Multimedia Audio Codec. The CS9236 is a high quality low-cost way to add Wavetable music synthesis to the sound card and can be soldered down during the production process, or added later if a PLCC socket is installed. The CRD4235-6 reference design is backed by a customer ready manufacturing kit. Included in the kit are full schematic and library design files, PWB job files, and PWB artwork files. The OEM has the option of quickly modifying the existing design for their specific requirements or implementing the design as is. Documentation source files are available to allow the OEM to quickly create an accurate end user manual. ORDERING INFO CMK4235-6 DS252RD6C2 Copyright (c) Cirrus Logic, Inc. 1998 (All Rights Reserved) MAY `98 CRD4235-6 16-bit Low-Cost Audio Adapter Reference Design GENERAL INFORMATION The CRD4235-6 is a reference design of a production-grade PC-AT adapter card using the CrystalClear CS4235 Multimedia Audio Codec. This card is designed to provide the highest possible functionality, along with superlative audio performance at a low manufacturing cost. The CRD4235-6 is FCC class B and CISPR certified. All logical subsystems are fully Plug and Play compliant and ready for all Microsoft (R) Operating Systems. The design provides a full set of features required for today's multimedia applications. The CRD4235-6 reference design includes many features that make it possible to manufacture one board and actively compete in different markets. All of the following features can be eliminated from the design during the manufacturing process if a cost reduction is desired. The microphone input feature allows the use of both internal and external microphone sources. Jumper selectable ouput amplifier. The CRD4235-6 can be manufactured with both amplifiers, or the OEM has the option to only populate the desired amplifier at the time of manufacture, and hard-wire the jumper for a fixed configuration. The CD-ROM audio input has been designed to provide two popular header sizes, since both connectors cannot be used simultaneously, the OEM can elect to only populate the desired CDROM Audio jack. The MODEM audio circuitry has been designed to interface to a audio capable modem board, and can be completely removed from the CRD4235-6 if this feature is not required. A dual joystick and MIDI interface is available with an industry standard 15-pin D-sub connector. Wavetable audio is available with the on-board CS9236 single chip Wavetable IC. embedded multimedia applets provided by Microsoft. Cirrus Logic provides the essential multimedia applets and drivers required for the Windows(R) 3.1 and OS/2(R) operating systems on the drivers diskette. DOS utilities are also available which allow the computer to play a CD-ROM and control the sound volume. All aspects of the design have been optimized to ensure top performance at the lowest cost. Care was taken with signal routing and component placement to minimize sources which can degrade performance. Cirrus' analog design know-how has resulted in a board which preserves the exceptional analog performance of the CS4235 audio Codec. BOARD AUDIO INTERCONNECTIONS Three external stereo jacks (listed top to bottom) allow connection to a mono Microphone input, a stereo Line input, and a stereo Line/Headphone or speaker output. Headers for internal microphone, two common styles of CD-ROM audio, and a MODEM audio interface are also supported. The first jack, designated MIC IN, is a single-ended microphone (as opposed to differential) input, supporting most common types of dynamic or phantom powered microphones. The microphone input circuitry provides no signal amplification, but a 20 dB gain block inside the CS4235 can be software enabled (the "Boost" button in the Windows input applet) if signal levels are too low. In many cases, the additional "Boost" will be required with the CRD4235-6 implementation in order to achieve a desirable audio level. The second input jack, designated LINE IN, is for line inputs and is connected to the AUX1 inputs of the CS4235. Each channel has an input impedance of approximately 15 k. The maximum full scale input that the LINE IN function can tolerate is 2 VRMS. The third jack is LINE OUT/SPEAKER OUT. The line output from the CS4235 is either amplified by - - - - Software drivers are available for the CS4235 that support all major operating systems. The Windows 95TM drivers are fully Plug and Play compatible, and like the Windows NTTM drivers, will utilize the 2 DS252RD6C2 CRD4235-6 16-bit Low-Cost Audio Adapter Reference Design a low-noise, low-distortion amplifier, or by a speaker amplifier. The unused amplifier need not be populated at manufacturing time in order to simplify this output function. The CS4235 CD-ROM audio input headers are connected in parallel, which means that only one can be active at a time. The OEM will need to make this clear to end users, or delete the unused connector entirely. The MODEM header provides an audio interface between the sound card and a modem. Mono out and Mic out signals transfer audio from the sound card to the modem, and a mono in signal transfers audio from the modem to the sound card. On-board music synthesis is furnished by an FM synthesizer internal to the CS4235. For enhanced synthesis support, the CS9236 single-chip Wavetable Synthesis IC can be populated. The CS9236 provides a digital signal to the CS4235 via a serial interface, which is internally converted to an analog signal. The CS9236 interface is enabled by setting the WTEN bit in the EEPROM. The Line and CD analog inputs shown in Figure 5 are both routed through 6 dB attenuators, and DC blocking capacitors. This circuitry provides input protection for the CS4235, and isolation from the analog input DC bias. 100 pF capacitors can be populated on the line input to provide better FCC filtering. The output (Figure 6) of the CS4235 mixer is only capable of driving impedances greater than 10 k with a maximum voltage of 1 VRMS . Some form of output amplifier is usually required to drive powered speakers or headphones. The CRD4235-6 has the several output amplifier options. A low-cost LM1458, or a high-quality NE5532 amplifier can be populated at location U7. Both amplifier options are not capable of driving non-amplified (4 16 ) speakers. The other output option is discussed in detail under Figure 8. The header which selects the output amplifier is J8 (Left) and J9 (Right). An alternate output circuit configuration is based around U13. The LM1458N (Figure 6) provides left and right mixing to supply a mono-out signal to an external modem. This option would normally be used in addition to one or more of the above mentioned options, instead of as a replacement. The microphone circuit (Figure 7) was designed to be low cost, with a low component count. No amplification of the incoming signal is provided. The +5 VA supply is reduced to 2.5 V with a resistive voltage divider. This reference is used to provide a low-noise source for phantom powered microphones. Phantom power is permanently applied CIRCUIT DESCRIPTIONS The functional block diagram is shown in Figure 1. The CS4235 (as shown in Figure 2) is the heart of the CRD4235-6 reference design. The CS4235 is a Plug-and-Play aware device that controls all aspects of the sound card. See CS4235 Datasheet for complete information on this device. The interconnections for ISA bus signals are detailed in Figure 3. The DB-15 connector shown in Figure 4, provides an interface to an external joystick and MIDI I/O. The joystick interface supports two joysticks: two pair of X/Y coordinates and four buttons. The internal resistors and 1000 pF caps provide the correct debounce period for the joystick buttons. The timing for the joystick position is determined by the joystick potentiometer, the series 2.2 k resistor and the 5600 pF capacitor. Deviation from the 2.2 k and 5600 pF component values will result in improper joystick positioning. The MIDI TXD and MIDI RXD signals are TTL level signals and not compatible with direct MIDI cabling. An external "break-out" box attached to the 15-pin D-sub connector interfaces the TTL MIDI signals to an isolated MIDI connector. DS252RD6C2 3 CRD4235-6 16-bit Low-Cost Audio Adapter Reference Design through a 2.2 k resistor to either the right or left channels of the stereo jack. This provides for microphones that require bias on either the tip or ring of the microphone's plug. The choice of right or left phantom power is a hardware population option. Placing phantom power on the ring connection of the jack is the typical configuration. An internal microphone can be connected to a header, in place of the external microphone jack input. The U13 LM1458N (Figure 7) circuitry has been provided to supply an amplified microphone signal to an external modem. The U13 device can be nonpopulated if the modem function is not required. The TDA1517 can provide amplified audio power to a set of non-powered speakers (Figure 8). It is also capable of driving headphones, and powered speakers. This device can be used as the only output amplifier on the CRD4235-6, but the overall audio performance is not as good as that provided by the LM1458N. An "L" series 5 V regulator (Figure 9) provides a clean low noise supply for the analog subsections of the CRD4235-6. The TO-92 package is adequate to provide the current and power dissipation required. If cost is the deciding factor, the LM78L05 can be non-populated and replaced with R44, with a loss of audio quality. The 3.3 VD supply is required for the CS9236 and can be non-populated when the CS9236 is not used. Two different methods are provided for generating the 3.3V supply voltage. A 3.3 V regulator is available by populating the LT1121CZ-3.3 (U10), or by using the lower-cost configuration of an MPS2222 (Q1), 1N5228 (D1) and a 100 resistor (R45). The +12 V and -12 V power are filtered through a simple LC filter. An external serial EEPROM (also shown in Figure 9) contains the Plug-and-Play configuration table. The CRD4235-6 includes a footprint for both a DIP and a SOIC EEPROM. Only one of these should be populated. After a power-on-reset, the data within the EEPROM is serially transferred to the CS4235. The XA0 pin serves as the serial clock while the XD0 pin functions as the bi-directional serial data-path. The EEPROM's data pin and the CS4235 XD0 pin are open collectors; a pull-up resistor is mandatory. If a Microsoft WHQL logo is not required, then the EEPROM can be removed and the CRD4235-6 will function based on internal resources. Reference design: -- silk screen. (Figure 10) -- (component) top side. (Figure 11) -- (solder) bottom side. (Figure 12) Microsoft and Windows are registered trademarks Windows NT, Windows 95 and Windows Sound System are trademarks of Microsoft. OS/2 is a registered trademark of International Business Machines Corporation. Ad Lib is a trademark of Adlib Corporation. CrystalClear is a trademark of Cirrus Logic, Inc. 4 DS252RD6C2 CRD4235-6 16-bit Low-Cost Audio Adapter Reference Design DS252RD6C2 Figure 1. CS4235-1E Schematic Block Diagram 5 6 CS4235 only CS423XB only not populated 16-bit Low-Cost Audio Adapter Reference Design CS423XB only CS4235 only CS423XB only CRD4235-6 DS252RD6C2 Figure 2. CS4235 CRD4235-6 16-bit Low-Cost Audio Adapter Reference Design DS252RD6C2 Figure 3. ISA Bus 7 CRD4235-6 16-bit Low-Cost Audio Adapter Reference Design 8 DS252RD6C2 Figure 4. Game Port / Wavetable not populated CRD4235-6 16-bit Low-Cost Audio Adapter Reference Design DS252RD6C2 Figure 5. CD Analog and Line Inputs 9 CRD4235-6 16-bit Low-Cost Audio Adapter Reference Design 10 DS252RD6C2 Figure 6. Line / Headphone Output CRD4235-6 16-bit Low-Cost Audio Adapter Reference Design DS252RD6C2 Figure 7. Microphone Input 11 CRD4235-6 16-bit Low-Cost Audio Adapter Reference Design 12 DS252RD6C2 Figure 8. Speaker Amplifier DS252RD6C2 not populated 08 08 16-bit Low-Cost Audio Adapter Reference Design CRD4235-6 NOTE: The Analog (AGND) and the Digital (GND) Ground Planes MUST be connected together Figure 9. Analog Power and EEPROM 13 CRD4235-6 16-bit Low-Cost Audio Adapter Reference Design 14 DS252RD6C2 Figure 10. Silk Screen CRD4235-6 16-bit Low-Cost Audio Adapter Reference Design DS252RD6C2 Figure 11. Top Side 15 CRD4235-6 16-bit Low-Cost Audio Adapter Reference Design 16 DS252RD6C2 Figure 12. Bottom Side DS252RD6C2 17 16-bit Low-Cost Audio Adapter Reference Design CRD4235-6 Bill Of Materials Item Quan. Reference 1 12 C11,C12,C13,C14,C15,C41,C53, C55,C56,C78,C79,C80 2 18 C2,C3,C6,C10,C20,C21,C22,C27, C33,C34,C36,C38,C40,C43, C58,C59,C60,C68 3 2 C5,C9 4 2 C24,C72 5 2 C17,C18 6 7 C31,C32,C44,C45,C46,C47,C73 7 4 C48,C49,C50,C51 8 1 C71 9 2 C74,C75 10 2 C76,C77 12 1 J1 13 3 J2,J7,J11 14 15 16 17 19 20 21 23 24 25 26 27 28 29 30 31 1 1 2 6 2 13 3 4 2 4 2 1 2 2 1 1 J3 J6 J9,J8 L1,L2,L3,L4,L5,L6 R2,R46 R4,R5,R32,R33,R35,R36,R40,R41, R47,R48,R49,R50,R53 R13,R51,R52 R25,R26,R27,R28 R29,R31 R30,R34,R54,R55 R39,R38 R43 R56,R57 R66,R67 U1 U3 Part 10uF .1uF October 13,1997 11:52:59 Manufacturer PANASONIC KEMET Description CAP,ELEC,10UF,TH,CASE C,20%,16V CAP,.1UF,SO,0805,10%,50V,X7R PN ECE-A1CN100S C0805C104K5RAC 100uF ELEC 1.0uF 22pF 1000pF 5600pF 0.01uF 470uF ELEC 0.33uF 4X1HDR PHONO-1/8 ECE-A1CKA101 GRM40-6Y5V105Z016AD C0805C220J5GAC C0805C102J5GAC C0805C562K5RAC O8052R103K9BB2 ECE-A1CGE471 GRM40-6X7R334K016AL TSW-104-07-T-S AJ-0356A-5P PANASONIC MURATA KEMET KEMET KEMET PHILIPS PANASONIC MURATA SAMTEC A/D ELECTRONICS JSF AMP SAMTEC PANASONIC PHILIPS PHILIPS PHILIPS PHILIPS PHILIPS PHILIPS PHILIPS PHILIPS PHILIPS PHILIPS TI ATMEL 4X1/80 HDR B4B-PH-K DB15 747845-3 3X1HDR FERRITE 3.3K 6.8K 4.7K 2.2K 68K 33K 10 0 15K 100K LM78L05 X24C08 SO TSW-103-07-T-S EXC-ELSA35 9C08052A3301J 9C08052A6801J 9C08052A4701J 9C08052A2201J 9C08052A6802J 9C08052A3302J 9C08052A10R0J 9C08052A0R00J 9C08052A1502J 9C08052A1003J uA78L05CLP AT24C08N-10SC CAP,ELEC,100uF,TH,CASE C,20%,16V CAP,1.0UF,SO,0805,+80/-20%,16V,Y5V CAP,22pF,SO,0805,5%,50V,COG CAP,1000pF,SO,0805,5%,50V,COG CAP,5600pF,SO,0805,10%,50V,X7R CAP,0.01uF,SO,0805,10%,50V,X7R CAP,ELEC,470UF,SO,CASE E,20%,16V CAP,0.33uF,0805,+/-10%,16V,X7R HDR,4X1,0.025"PIN,0.1"CTR CONN,1/8" SWITCHED STEREO PHONE JACK HDR,4X1/80,0.025"PIN,0.08"CTR CONN,15D SHELL,FEMALE,RT ANGLE PC MOUNT HDR,3X1,0.025"PIN,0.1"CTR IND,FBEAD,TH,AXIAL RES,3.3K,SO,0805,5%,1/10,METAL FILM RES,6.8K,SO,0805,5%,1/10W RES,4.7K,SO,0805,5%,1/10W RES,2.2K,SO,0805,5%,1/10 RES,68K,SO,0805,5%,1/10W,METAL FILM RES,33K,SO,0805,5%,1/10,METAL FILM RES,10,SO,0805,5%,1/10W RES,0,SO,0805 RES,15K,SO,0805,5%,1/10W RES,100K,SO,0805,5%,1/10W,METAL FILM IC,78L05,TH,TO-226AA,+ 5V VOLTAGE REGULATOR IC,24C08,SO,SOIC8,EEPROM Bill Of Materials Item 33 34 35 36 Quan. 1 1 1 1 Reference U7 U9 U12 Y1 Part LM1458N CS4235-KQ TDA1517P 16.9344 MHz October 13,1997 11:52:59 Manufacturer NATIONAL CRYSTAL PHILIPS FOX Description IC,1458,TH,DIP,DUAL OP AMP IC,SO,TQFP100,MULTIMEDIA CODEC SOT398-1,DIP-18 CRYSTAL 18 DS252RD6C2 PN LM1458N CS4235-KQ-Prelim TDA1517P HC49S-16.9344 16-bit Low-Cost Audio Adapter Reference Design CRD4235-6 * Notes * |
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