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CS4222
20-Bit Stereo Audio Codec with Volume Control
The following information is based on technical datasheet:
CS4222 DS236PP3 JAN '97 Please contact Cirrus Logic: Crystal Semiconductor Products Division for further product information.
&5<67$/6(0,&21'8&725 352'8&76 ',9,6,21 352'8&7 ,1)250$7,21
Copyright (c) Cirrus Logic, Inc. 1998 (All Rights Reserved)
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CS4222
Features
20-Bit Stereo Audio Codec with Volume Control
Features
q 99 dB 20-bit A/D Converters q 99 dB 20-bit D/A Converters q 110 dB DAC Signal-to-Noise Ratio (EIAJ) q Analog Volume Control
- 0.5 dB Step Resolution - 113.5 dB Attenuation q Soft Mute Capability
q Differential Inputs/Outputs q On-chip Anti-aliasing and Output Smoothing Filters q De-emphasis for 32, 44.1 and 48kHz q Stand-Alone or Control Port Mode q Single +5V power supply
Description
The CS4222 is a highly integrated, high performance, 20-bit, audio codec providing stereo analog-to-digital and stereo digital-to-analog converters using delta-sigma conversion techniques. The device operates from a single +5V power supply, and features low power consumption. Selectable de-emphasis filter for 32, 44.1, and 48 kHz sample rates is also included. The CS4222 also includes an analog volume control capable of 113.5 dB attenuation in 0.5 dB resolution. The analog volume control architecture preserves dynamic range during attenuation. Volume control changes are implemented using a "soft" ramping or zero crossing technique. Applications include reverb processors, musical instruments, DAT, and multitrack recorders.
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CS4222
Overview
SCL/CCLK SDA/CDIN
AD0/CS
SMUTE
MCLK
VD
VA
RST DEM1 DEM0
Control Port
Voltage Reference Left DAC Volume Control Analog Low Pass and Output Stage AOUTL+ AOUTL-
LRCK SCLK SDIN SDOUT
Serial Audio Data Interface
Digital Filters with De-Emphasis
Right DAC Left ADC
Volume Control
AOUTR+ AOUTRAINLAINL+
Digital Filters
Right ADC
AINRAINR+
DGND
AGND
Overview
The CS4222 has 2 channels of 20-bit analog-to-digital conversion and 2 channels of 20-bit digital-to-analog conversion. All ADCs and DACs are deltasigma converters. The DAC outputs have adjustable output attenuation implemented in 0.5 dB step resolution. The device also includes a soft mute function and digital de-emphasis for 32, 44.1, and 48 kHz. 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 CS4222 are communicated over a serial microcontroller interface.
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CS4222
FAQs FAQs
1) A: Why does the CS4222 implement analog volume control instead of digital volume control? Analog volume control allows one to preserve system dynamic range. As the audio signal is attenuated, the noise floor is also attenuated by the same amount. Thus, dynamic range is preserved during attenuation. Does the CS4222 have to be used with a microcontroller? No, the CS4222 may be operated in stand-alone mode or microcontroller mode. When using the device with a microcontroller, additional features can be accessed through the control port, such as volume control, ADC input level monitoring, volume control ramp rate, etc... De-emphasis and soft mute are offered in stand-alone mode. What does the term "soft volume control" mean? When the user writes a new volume control setting, the CS4222 ramps from the old volume setting to the new volume setting in 0.5 dB steps. This approach is audibly superior to a single large volume control change which can result in an audible "click" or "pop". The rate at which this ramp occurs can be set to 4 different settings through a register in the control port. This same approach is used when muting the DAC outputs.
2) A:
3) A:
Ordering Information
CS4222-KS 28 pin SSOP, -10 to +70 C CDB4222 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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CS4222
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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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