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CS5396 CS5397 120 dB, 96 kHz Audio A/D Converter
The following information is based on technical datasheet: CS5396/7 DS229PP2 JUL '97 Please contact Cirrus Logic: Crystal Semiconductor Products Division for further product information.
352'8&7 ,1)250$7,21
Copyright (c) Cirrus Logic, Inc. 1998 (All Rights Reserved)
PI229PP3 DEC `98
CS5396 CS5397
Features
120 dB, 96 kHz Audio A/D Converter
Features
q 24-Bit Resolution q Complete CMOS Stereo A/D System -- Delta-Sigma A/D Converters -- Digital Anti-Alias Filtering -- S/H Circuitry and Voltage Reference q CS5396 - digital filter optimized for audio q CS5397 - non-aliasing digital filter q Adjustable System Sampling Rates
including 32, 44.1, 48 & 96 kHz
q 120 dB Dynamic Range (A-Weighted) q Low Noise and Distortion
>105 dB THD + N
q Differential Analog Architecture q Linear Phase Digital Anti-Alias Filtering q Single +5V Power Supply
Description
The CS5396 and CS5397 are complete analog-to-digital converters for stereo digital audio systems. They perform sampling, analog-to-digital conversion and anti-alias filtering, generating 24-bit values for both left and right inputs in serial form at sample rates up to 100 kHz per channel.
PI229PP3 DEC `98
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CS5396 CS5397
Overview
The CS5396/97 use a patented 7th-order, tri-level delta-sigma modulator followed by digital filtering and decimation, which removes the need for an external anti-alias filter. The ADCs use a differential architecture which provides excellent noise rejection. The CS5396 has a linear phase filter optimized for audio applications with 0.005 dB passband ripple and >117 dB stopband rejection. The CS5397 has a non-aliasing filter response with 0.005 passband ripple and >117 dB stopband attenuation. The CS5396/97 are targeted for the highest performance professional audio systems requiring wide dynamic range, negligible distortion and low noise.
VCOM
MCLKA
ADCTL
DACTL CAL
SCLK LRCK SDATA1 SDATA2 MCLKD
VREF
Voltage Reference Serial Output Interface + LP Filter S/H DAC + LP Filter S/H DAC Digital Decimation Filter (with Low Group Delay Options) + Comparator Digital Decimation Filter (with Low Group Delay Options)
Serial Control Port
CS CDIN CCLK
AINLAINL+
Psychoacoustic Filter + Comparator Calibration Microcontroller Calibration SRAM
AINRAINR+
VA
AGND1
AGND2
AGND0
VL
LGND TST0
TST1
VD
DGND
Overview
The CS5396/97 is a 24-bit, stereo A/D converter designed for stereo digital audio applications. The analog input channels are simultaneously sampled by separate, patented, 7th-order tri-level delta-sigma modulators to sample the analog input signals at either 128 or 64 times the output sample rate of the
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PI229PP3 DEC `98
CS5396 CS5397
FAQs
device. The resulting serial bit streams are digitally filtered, yielding pairs of 24-bit values at output sample rates of up to 100 kHz. This technique yields nearly ideal conversion performance independent of input frequency and amplitude. The converter does not require difficult-to-design or expensive antialias filters and it does not require external sample-and-hold amplifiers or voltage references. Only normal power supply decoupling components, voltage reference bypass capacitors and a single resistor and capacitor on each input for anti-aliasing are required. An on-chip voltage reference provides for a differential input signal range of 4.0 Vpp. The device also contains a high pass filter, implemented digitally after the decimation filter, to completely eliminate any internal offsets in the converter or any offsets present at the input circuitry to the device. Output data is available in serial form, coded as 2's complement 24-bit numbers.
FAQs
1) Why does an audio A/D converter (CS5396) support 96 KHz sample rates when the audio bandwidth has traditionally been up to only 20 KHz? Although audio waveforms can only be heard by humans up to approximately 20 KHz, studies suggest that higher frequency signals affect human perception of sounds in the traditional audio bandwidth. Why do audio applications require an A/D converter with such wide dynamic range? CDs have a maximum dynamic range of less than 100 dB. One target market for the CS5396 is digital mixing consoles. When channels are mixed in a digital console the noise floors add so the resulting dynamic range may be much lower than the dynamic range of a single channel. Therefore designers want to use A/D converters with very wide dynamic range so the final mix still has high dynamic range and excellent sound quality.
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PI229PP3 DEC `98
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CS5396 CS5397
Ordering Information Ordering Information
CS5396-KS CS5397-KS 28-pin SOIC 28-pin SOIC -10 - 50C -10 - 50C
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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PI229PP3 DEC `98
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. Redwood Lane, Ste. 105, First Floor Bldg. 16 Portland, Oregon 97224 Ph: 503-620-5547 FAX: 503-620-5665 Cirrus Logic, Inc. 827 Wellesley Ave. Los Angeles, CA 90049 Ph: 310-820-6489 FAX: 310-820-6180 Cirrus Logic International 3998 NW 8th Ave., Ste. 300 Boca Raton, FL 33431 Ph: 561-395-1613 FAX: 561-395-1373
FAR EAST China Cirrus Logic International Ltd. 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
Northeastern Area Cirrus Logic, Inc. 10 New England Business Center, Ste. 100 Andover, MA 01810 Ph: 978-794-9992 FAX: 978-794-9998
Cirrus Logic, Inc. 10440 Little Patuxent Pkwy., Ste. 300 Columbia, MD 21044-3559 Ph: 410-740-5654 FAX: 410-740-6961
EUROPE Cirrus Logic International SARL Immeuble Andre Malraux 1 rue de Rome F-93561 Rosny-sous-Bois CEDEX, France Ph: +33148122812 FAX: +33148122810
Cirrus Logic UK. Anglers Court 4-5 Spittal St. Marlow Bucks, England SL7 1DB Ph: +44(0)1628 472 211 FAX: +44(0)1628 486 114 Cirrus Logic GmbH Muehlfelder-Strasse 2 D-82211 Herrsching, Germany Ph: +49815292460 FAX: +498152924699
Central Area Cirrus Logic, Inc. 14205 Burnet Rd., Ste. 400 Austin, TX 78728 Ph: 512-255-8893 FAX: 512-255-0733
Cirrus Logic, Inc. 2500 W. Higgins Road, Ste. 1125 Hoffman, Estates, IL 60195 Ph: 847-884-6750 FAX: 847-884-6795
Sotheastern Area Cirrus Logic, Inc.. 5511 Capital Center Dr., Ste. 103 Raleigh, NC 27606 Ph: 919-859-5210 FAX: 919-859-5334
PO BOX 17847 4210 S. INDUSTRIAL DRIVE AUSTIN, TEXAS 78744 512.445.7222 / 800.888.5016 FAX: 512.445.7581 WORLDWIDE WEB: http://www.cirrus.com

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