CS4223/24 Product Bulletin

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CS4223/24
24-Bit 105 dB Audio
Codec with Volume
Control
The following information is based on the
technical datasheet:
CS4223/4 DS290PP1 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)
PI290PP1 OCT ‘98
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CS4223/24
Features
24-Bit 105 dB Audio Codec with Volume Control
Features
● 105 dB Dynamic Range A/D Converters
● 105 dB Dynamic Range D/A Converters
● 110 dB DAC Signal-to-Noise Ratio (EIAJ)
● Analog Volume Control (CS4224 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 CS4223/4 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 CS4223/4 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.
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CS4223/24
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
( ) = CS4223
AGND
* = CS4224
Overview
The CS4223/4 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 CS4224 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 CS4223 is a stand-alone device controlled via pins. Control for the
functions available on the CS4224 are communicated over a serial microcontroller interface.
The CS4224 supports additional functions through the control port interface as
outlined in Table 1.
2
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CS4223/24
FAQs
CS4224
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
CS4223
De-emphasis
20, 24 bit Interface
Codec power down
Cal on power-up
High pass enabled
Table 1. CS4224 vs. CS4223
FAQs
1)
A:
Why does the CS4224 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 CS4224 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 CS4224. 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.
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CS4223/24
Ordering Information
Ordering Information
CS4223-KS
CS4224-KS
CDB4223/4
-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
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Sales Office and Applications Support
UNITED STATES
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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