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CS4226
Surround Sound Codec
The following information is based on the technical datasheet:
CS4226 DS188PP5 NOV '96 Please contact Cirrus Logic : Crystal Semiconductor Products Division for further information.
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Copyright (c) Cirrus Logic, Inc. 1998 (All Rights Reserved)
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CS4226
Features
Surround Sound Codec
Features
q Stereo 20-bit A/D Converters q Six 20-bit D/A Converters q S/PDIF Receiver
- AC-3 & MPEG Auto-detect Capability
q 108 dB DAC Signal-to-Noise Ratio (EIAJ)
q Mono 20-bit A/D Converter q Programmable Input Gain & Output Attenuation q On-chip Anti-aliasing and Output Smoothing Filters q De-emphasis for 32 kHz, 44.1 kHz, 48 kHz
Description
The CS4226 is a single-chip codec providing stereo analog-to-digital and six digital-to-analog converters using delta-sigma conversion techniques. This +5 V device also contains volume control independently selectable for each of the six D/A channels. An S/PDIF receiver is included as a digital input channel. Applications include Dolby(R) Pro-logicTM, THX(R), and Dolby Digital AC-3(R) home theater systems, DSP based car audio systems, and other multichannel applications. The CS4226 is packaged in a 44-pin plastic TQFP.
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CS4226
Overview
SCL/CCLK PDN
SDA/CDOUT
AD1/CDIN
AD0/CS
SPI/I2C
VD+ VA+ Voltage Reference
CMOUT
Control Port DAC #1 Volume Control Volume Control Volume Control
Volume Control
AOUT1
LRCK Digital Filters SCLK SDIN1 SDIN2 SDIN3
DAC #2 Serial Audio Data Interface DAC #3 DAC #4 DAC #5 DAC #6 Mono ADC Digital Filters Mux DEM Clock Osc/ Divider PLL Left ADC
Right ADC
AOUT2 Analog Low Pass and Output Stage
AOUT3
AOUT4
Volume Control Volume Control
AOUT5
SDOUT1 SDOUT2 OVL/ERR
AOUT6
AINAUX Input Gain AIN1L AIN1R AIN2L/FREQ0 AIN2R/FREQ1 AIN3L/AUTODATA AIN3R/AUDIO AGND1 AGND2 DGND1 DGND2
DEM
S/PDIF RX/Auxiliary Input
CLKOUT
XTI XT0
FILT HOLD/RUBIT LRCKAUX/RX3 RX1 DATAUX/RX4 SCLKAUX/RX2
Overview
The CS4226 has 2 channels of 20-bit analog-to-digital conversion and 6 channels of 20-bit digital-to-analog conversion. A mono 20-bit ADC is also provided. All ADCs and DACs are delta-sigma converters. The stereo ADC inputs have adjustable input gain, while the DAC outputs have adjustable output attenuation. The device also contains an S/PDIF receiver capable of receiving compressed AC-3/MPEG or uncom-pressed digital audio data. Digital audio data for the DACs and from the ADCs is communicated over separate serial ports. This allows concurrent writing to and reading from the device. Control for the functions available on the CS4226 are communicated over a serial microcontroller interface.
Input Mux
2
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CS4226
FAQs FAQs
1) A: Why does the CS4226 contain an S/PDIF receiver? The CS4226 Surround Sound Codec along with the CS4923 Dolby Digital decoder implements a two chip solution to home theater A/V receivers. The S/PDIF receiver on the CS4226 locks onto the digital audio source (DVD, LD, CD), and transfers the digital audio data to the CS4923 DSP for AC-3 decoding. This CS4226 contains six DACs for playback to six speakers and an A/D converter for digitizing an analog pro-logic source. What does the AUTODATA output signal? For AC-3, MPEG, or DTS applications, it is important to know whether the incoming S/PDIF data stream is digital audio or compressed AC-3/ MPEG/DTS data. This information is typically conveyed by setting channel status bit 1 (audio/non-audio bit), but some AC-3/MPEG/DTS sources may not strictly adhere to this convention and the bit may not be properly set. The CS4226 S/PDIF receiver can automatically detect the presence of compressed audio data streams by monitoring the sync codes in the data stream. When the sync code is detected, the AUTODATA indicator (pin 10) will go high. The AUTODATA pin can flag the DSP to change algorithms or to mute the DAC outputs. Is the CS4226 volume control analog or digital? The CS4226 implements a combined analog/digital volume control architecture which is the optimal solution for performance and cost. The first 24 dB of attenuation is performed in the analog domain which reduces the residual output noise to that achieved in the mute state. Because the attenuation is performed in the analog domain, as the signal is attenuated the noise floor is attenuated thus preserving dynamic range. The remaining attenuation is performed digitally to a maximum attenuation of 86 dB.
2) A:
3) A:
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CS4226
Ordering Information
4) A: Why is de-emphasis performed in the S/PDIF receiver data path? The CS4226 S/PDIF receiver acquires data from a digital audio source (i.e. CD, DVD player) and transfers the data to a digital signal processor (DSP). If the data from the digital audio source is pre-emphasized, then de-emphasis should be performed prior to the DSP so that the DSP can process audio data with a flat frequency response.
Ordering Information
CS4226-KQ CDB4226 TQFP, -10 C to +70 C Evaluation Board
For further information on Crystal products, please visit our website "www.crystal.com" or call our literature department (800) 888-5016 ext. 3594 or (512) 912-3594 for data sheets and application notes.
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Sales Office and Applications Support
UNITED STATES Sales Office and Applications Support: WESTERN AREA Cirrus Logic Crystal Semiconductor Div. 50 Airport Pkwy. San Jose, CA 95110 Ph: 408-437-7743 FAX: 408-437-4943
Cirrus Logic Crystal Semiconductor Div. 6 Venture, Ste. 100 Irvine, CA 92718 Ph: 714-453-5910 FAX: 714-453-5914
EUROPE Sales Office and Applications Support:
Cirrus Logic France Immeuble Andre Malraux 93561 Rosny s/s Bois CEDEX, France Ph: +33(148)122812 FAX: +33(148)122810 Cirrus Logic Crystal Semiconductor (UK) Ltd. Spectrum Point, 279 Farnborough Rd., Farnborough, Hampshire GU14 7LS, United Kingdom Ph: +44(0)1252372762 FAX: +44(0)1252372763 Cirrus Logic GmbH Muehlfelder-Strasse 2 D-82211 Herrsching, Germany Ph: +49(08152)92460 FAX: +49(08152)924699
KOREA Cirrus Logic, Korea Co., Ltd. Rm 1302 SangKyung Bldg., 82421 YeokSam-Dong, KangNam-Ku, Seoul, Korea Ph: +82(2)565-8561 FAX: +82(2)565-8565 SINGAPORE Cirrus Logic Crystal International 6 Kaki Bukit Ave. 1, Ste. 03-03 Singapore 417940 Ph: +65-743-4111 FAX: +65-742-4111 TAIWAN Cirrus Logic International Ltd. Taiwan Branch 10F, No.214 Tun Hwa North Rd. Taipei, Taiwan R.O.C. Ph: +886(2)2718-4533 FAX: +886(2)2718-4526
CENTRAL AREA Cirrus Logic Crystal Semiconductor Div. 14205 Burnet Rd., Ste. 400 Austin, TX 78728 Ph: 512-255-8893 FAX: 512-255-0733 EASTERN AREA Cirrus Logic Crystal Semiconductor Div. 5511 Capital Center Dr., Ste. 103 Raleigh, NC 27606 Ph: 919-859-5393 FAX: 919-859-5334
Cirrus Logic 10 New England Business Center, Ste. 100 Andover, MA 01810 Ph: 978-794-9138 FAX: 978-794-9998 Cirrus Logic Crystal Semiconductor Div. 10440 Little Patuxent Pkwy., Ste. 300 Columbia, MD 21044-3559 Ph: 410-740-5654 FAX: 410-740-6961
JAPAN FAR EAST Sales Office and Applications Support: CHINA Cirrus Logic International Ltd. A-1403, Qiancun Commercial Mansion Beijing, China 100029 Ph: (8610)6443-0783 Ph: (8610)6443-0784 Ph: (8610)6443-0785 FAX: (8610)6443-0786 HONG KONG Cirrus Logic International Ltd. 1203 Park Tower 15 Austin Rd., Tsimshatsui Kowloon, Hong Kong Ph: (852)2376-0801 FAX: (852)2375-1202 Sales Office and Applications Support: Cirrus Logic K.K. Shinjuku Green Tower, Bldg. 26F 6-14-1 Nishi-Shinjuku, Shinjuku-ku, Tokyo, 160 Japan Ph: +81(03)3340-9111 FAX: +81(03)3340-9120
CRYSTAL SEMICONDUCTOR PRODUCTS DIVISION PO BOX 17847 4210 S. INDUSTRIAL DRIVE AUSTIN, TEXAS 78744 512.445.7222 / 800.888.5016 FAX: 512.445.7581 WORLDWIDE WEB: http://www.crystal.com

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