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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.
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Copyright (c) Cirrus Logic, Inc. 1998 (All Rights Reserved)
PI284PP1 OCT `98
CS4220/21
Features
24-Bit Stereo Audio Codec with 3V Interface
Features
q 100 dB Dynamic Range A/D Converters q 100 dB Dynamic Range D/A Converters q 110 dB DAC Signal-to-Noise Ratio (EIAJ) q Analog Volume Control (CS4221 only) q Differential Inputs q Differential Outputs q On-chip Anti-aliasing and Output Smoothing Filters q De-emphasis for 32, 44.1 and 48 kHz q Supports Master and Slave Modes q Single +5 V power supply q On-Chip Crystal Oscillator q 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
CS4220/21
Overview
(DIF1) (DIF0) (DEM0) (DEM1) 2 SCL/CCLK SDA/CDIN AD0/CS I C/SPI
VL
MCLK
VD
VA
RST
Control Port Digital Filters with De-Emphasis
Voltage Reference Left DAC Volume Control Analog Low Pass and Output Stage
*
LRCK SCLK
Serial Audio Data Interface
AOUTL+ AOUTL-
Right DAC
Volume Control
*
AOUTR+ AOUTRAINLAINL+ AINRAINR+
SDOUT
Digital Filters
SDIN
Left ADC Right ADC
Clock OSC
XTI XTO
( ) = CS4220
DGND
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
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. 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. 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.
2) A:
3) A:
PI284PP1 OCT `98
3
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
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
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