4220-1PI.FM Page -1 Thursday, October 29, 1998 2:40 PM CS4220/21 24-Bit Stereo Audio Codec with 3V Interface The following information is based on the technical datasheet: CS4220/1 DS284PP1 OCT ’98 Please contact Cirrus Logic : Crystal Semiconductor Products Division for further information. &5<67$/6(0,&21'8&725 352'8&76',9,6,21 352'8&7,1)250$7,21 Copyright © Cirrus Logic, Inc. 1998 (All Rights Reserved) PI284PP1 OCT ‘98 4220-1PI.FM Page 0 Thursday, October 29, 1998 2:40 PM 4220-1PI.FM Page 1 Thursday, October 29, 1998 2:40 PM CS4220/21 Features 24-Bit Stereo Audio Codec with 3V Interface Features ● 100 dB Dynamic Range A/D Converters ● 100 dB Dynamic Range D/A Converters ● 110 dB DAC Signal-to-Noise Ratio (EIAJ) ● Analog Volume Control (CS4221 only) ● Differential Inputs ● Differential Outputs ● On-chip Anti-aliasing and Output Smoothing Filters ● De-emphasis for 32, 44.1 and 48 kHz ● Supports Master and Slave Modes ● Single +5 V power supply ● On-Chip Crystal Oscillator ● 3 - 5 V Digital Interface Description The CS4220/1 is a highly integrated, high performance, 24-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 +5 V power supply, and features low power consumption. Selectable de-emphasis filter for 32, 44.1, and 48 kHz sample rates is also included. The CS4220/1 also includes an analog volume control capable of 113.5 dB attenuation in 0.5 dB steps. 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 digital effects processors, DAT, and multitrack recorders. PI284PP1 OCT ‘98 1 4220-1PI.FM Page 2 Thursday, October 29, 1998 2:40 PM CS4220/21 Overview (DIF1) (DIF0) (DEM0) (DEM1) 2 SCL/CCLK SDA/CDIN AD0/CS I C/SPI SDIN SDOUT Digital Filters with De-Emphasis Digital Filters SCLK VD VA Voltage Reference Control Port Serial Audio Data Interface LRCK MCLK Left DAC Right DAC Volume Control * Volume Control * Analog Low Pass and Output Stage RST VL AOUTL+ AOUTL- AOUTR+ AOUTR- Left ADC AINLAINL+ Right ADC AINRAINR+ Clock OSC XTI XTO DGND ( ) = CS4220 AGND * = CS4221 Overview The CS4220/1 has 2 channels of 24-bit analog-to-digital conversion and 2 channels of 24-bit digital-to-analog conversion. All ADCs and DACs are deltasigma converters. The DAC outputs on the CS4221 have adjustable output attenuation implemented in 0.5 dB step resolution. The device also includes 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. The CS4220 is a stand-alone device controlled via pins. Control for the functions available on the CS4221 are communicated over a serial microcontroller interface. The CS4221 supports additional functions through the control port interface as outlined in Table 1. 2 PI284PP1 OCT ‘98 4220-1PI.FM Page 3 Thursday, October 29, 1998 2:40 PM CS4220/21 FAQs CS4221 Volume control Adjustable Mute ramp rate Enable zero crossing detect Enable/Disable mute on zero input De-emphasis Mute DAC outputs ADC Input Peak Level Detect 20, 24 bit Interface Codec power down Cal on command High pass enable/disable CS4220 De-emphasis 20, 24 bit Interface Codec power down Cal on power-up High pass enabled Table 1. CS4221 vs. CS4220 FAQs 1) A: Why does the CS4221 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. 2) A: What does the term "soft volume control" mean? When the user writes a new volume control setting, the CS4221 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. 3) A: Are these parts backward compatible with the CS4222? The best choice for backward compatibility is the CS4221. Pin 13 changes from being DEM0 to being VL, the pin to set the logic interface voltage level. Pin 2 ceases to be SMUTE and becomes XTO, the drive pin for the on chip crystal oscillator. PI284PP1 OCT ‘98 3 4220-1PI.FM Page 4 Thursday, October 29, 1998 2:40 PM CS4220/21 Ordering Information Ordering Information CS4220-KS CS4221-KS CDB4220/1 -10 to 70 °C -10 to 70 °C Evaluation Board 28-pin SSOP 28-pin SSOP 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. 4 PI284PP1 OCT ‘98 4220-1PI.FM Page 5 Thursday, October 29, 1998 2:40 PM Sales Office and Applications Support UNITED STATES Western Area Cirrus Logic, Inc. 3100 West Warren Ave. Fremont, CA 94538 Ph: 510-623-8300 FAX: 510-252-6020 Southern California, Sales Westlake Village The Townsgate Executive Bldg. 2659 Townsgate Road, Suite 238 Westlake Village, CA 91361 Ph: 805-371-5860 FAX 805-371-5861 Cirrus Logic, Inc. 6650 S.W. 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A-1403 Seg Paowah Bldg. No. 1016 Huaqiang N. Rd. Shenzhen, China 518031 Ph: 86-755-3779537 FAX: 86-755-3779734 Hong Kong Cirrus Logic International Ltd. 1203 Park Tower 15 Austin Rd., Tsimshatsui Kowloon, Hong Kong Ph: (852)2376-0801 FAX: (852)2375-1202 Korea Cirrus Logic, Korea Co., Ltd. Rm 1302 SangKyung Bldg., 824-21 YeokSam-Dong, Kang Nam-Ku, Seoul, Korea Ph: +82(2)565-8561 FAX: +82(2)565-8565 Singapore Cirrus Logic International Ltd. 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(22)718-4533 FAX: +886(22)718-4526 JAPAN Cirrus Logic K.K. Shinjuku Green Tower, Bldg. 26F 6-14-1 Nishi-Shinjuku, Shinjuku-ku, Tokyo, Japan 160 Ph: +81(03)3340-9111 FAX: +81(03)3340-9120 4220-1PI.FM Page 6 Thursday, October 29, 1998 2:40 PM CRYSTAL SEMICONDUCTOR PRODUCTS DIVISION PO BOX 17847 4210 S. 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