Cirrus Logic CS4221 User Manual

CS4220
CS4221

24-Bit Stereo Audio Codec with 3V Interface

Features

l 100 dB Dynamic Range A/D Converters
l 100 dB Dynamic Range D/A Converters
l 105 dB DAC Signal-to-Noise Ratio (EIAJ)
l Analog Volume Control (CS4221 only)
l Differential Inputs / Outputs
l On-chip Anti-aliasing and Output Smoothing

Filters

l De-emphasis for 32, 44.1 and 48 kHz
l Supports Master and Slave Modes
l Single +5 V powe r supp l y
l On-Chip Crystal Oscillator
l 3 - 5 V Digital Interface

I

Description

The CS4220/1 is a hig hly integ rated , high p erforma nce,
24-bit, audio codec providing stereo analog-to-digital
and stereo digital-to -analog converters using del ta-sig­ma conversion te chniques. The de vice opera tes 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 CS4221 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 atte nuation. Volume control changes are

implemented using a “soft” ramping or zero crossing
technique.

Applications include digital effects processors, DAT, and
multitrack recorders.

ORDERING INFORMATION

CS4220-KS -10 to +70 °C 28-pin SSOP
CS4221-KS -10 to +70 °C 28-pin SSOP
CDB4220/1 Evaluation Board

(

)(

DIF1

SCL/CCLK SDA/CDIN AD0/CS MCLK VD VA

RST

LRCK

SCLK

SDIN

SDOUT

Serial AudioData Interface

Preliminary Product Information

)(

DIF0

Control Port

Digital Filters

with De-Emphasis

Digital Filters

Clock OSC

XTI XTO

)

(

DEM0

DEM1

2

IC/SPI

Left

DAC

Right

DAC

Left

ADC

Right

ADC

()=CS4220

)

*

V

L

Volume

Control

Volume

Control

DGND AGND

=CS4221

*

*

Voltage

Reference

Analog Low Pass

AOUTL+
AOUTL-

AOUTR+

and Output Stage

AOUTR-

AINL­AINL+

AINR­AINR+

This document contains information for a new product.
Cirrus Logic reserves the right to modify this product without notice.

P.O. Box 17847, Austin, Texas 78760
[phone] FAX: [phone]
http://www.cirrus.com

Copyright  Cirrus Logic, Inc. 1999

(All Rights Reserved)

APR ‘00

DS284PP3

1

TABLE OF CONTENTS

1. CHARACTERISTICS AND SPECIFICATIONS .................................. ....... ...... ....... ...... ....... ..... 4

ANALOG CHARACTERISTICS ............................................................................................... 4

ABSOLUTE MAXIMUM RATINGS ..........................................................................................6

RECOMMENDED OPERATING CONDITIONS ...................................................................... 6

SWITCHING CHARACTERISTICS ................... ....... ...... ...... ....................................... ....... ..... 7

SWITCHING CHARACTERISTICS - CONTROL PORT - SPI MODE (CS4221) ....................8

SWITCHING CHARACTERISTICS - CONTROL PORT - I

2. TYPICAL CONNECTION DIAGRAM — CS4220 ...................................................................10

3. TYPICAL CONNECTION DIAGRAM — CS4221 ...................................................................11

4. REGISTER QUICK REFERENCE - CS4221 ..........................................................................12

5. REGISTER DESCRIPTIONS - CS4221 ..................................................................................13

5.1 ADC Control (address 01h) ..............................................................................................13

5.1.1 Power Down ADC (PDN) ....................................................................................... 13

5.1.2 Left and Right channel High Pass Filter Defeat (HPDR-HPDL) .............................13

5.1.3 Left and Right Channel ADC Muting (ADMR-ADML) .............................................13

5.1.4 Calibration Control (CAL) .......................................................................................13

5.1.5 Calibration Status (CALP) (Read Only) ..................................................................13

5.1.6 Clocking Error (CLKE) (Read Only) .......................................................................14

5.2 DAC Control (address 02h) ..............................................................................................14

5.2.1 Mute on Consecutive Zeros (MUTC) ...................................................................... 14

5.2.2 Mute Control (MUTR-MUTL) ..................................................................................14

5.2.3 Soft RAMP Control (SOFT) ....................................................................................14

5.2.4 Soft RAMP Step Rate (RMP) .................................................................................15

5.3 Left Channel Output Attenuator Level (address 03h) ......................................................15

5.4 Right Channel Output Attenuator Level (address 04h) ...................................................15

5.4.1 Attenuation level (ATT7-ATT0) ............................................................................... 15

5.5 DSP Port Mode (address 05h) .........................................................................................16

5.5.1 De-emphasis Control (DEM) ..................................................................................16

5.5.2 Serial Input/Output Data SCLK Polarity Select (DSCK) .........................................16

5.5.3 Serial Data Output Format (DOF) ..........................................................................16

5.5.4 Serial Data Input Format (DIF) ...............................................................................16

5.6 Converter Status Report (Read Only) (address 06h) .......................................................17

5.6.1 Left and Right Channel Acceptance Bit (ACCR-ACCL) .........................................17

5.6.2 Left and Right Channel ADC Output Level (LVR and LVL) .................................... 17

5.7 Master Clock Control (address 07h) ................................................................................ 17

CS4220 CS4221

2

C MODE (CS4221) .....................9

Contacting Cirrus Logic Support
For a complete listing of Direct Sales, Distributor, and Sales Representative contacts, visit the Cirrus Logic web site at:

http://www.cirrus.com/corporate/contacts/

I2C is a registered trademark of Ph ilips Semiconductor.
SPI is a registered trademark of International Business Machines Corporation.

Preliminary product information describes products which are in production, but for which full characterization data is not yet available. Advance product infor­mation describes pr oducts which are in development and subj ect t o devel opment changes. Ci rrus Logic, Inc. has made best efforts to e nsure that the infor­mation contained i n this document is accurate and reli able. However, the information i s subject to chang e without notice an d is provided “AS IS” without

warranty of any kind (ex p res s or implied). No responsibility is assumed by Cirrus Logic, Inc. for the use of this in for mation, nor for infringements of patents or
other rights of third parties. This document is the property of Cirrus Logic, Inc. and implies no license under patents, copyrights, trademarks, or trade secrets.
No part of this publication may be copied, reprod uced, stor ed i n a retr i eval system, or transmitted, in any form or by any means (electronic, mechanical, pho­tographic, or otherwise) without the prior written consent of Cirrus Logic, Inc. Items from any Cirrus Logic website or disk may be printed for use by the user.
However, no part of the printout or electronic files may be copied, reproduced, stored in a retrieval system, or transmitted, in any form or by any means (elec­tronic, mechanical, photographic, or otherwise) without the prior written consent of Cirrus Logic, Inc.Furthermore, no part of this publication may be used as a
basis for manufacture or sale of an y item s witho ut the pri o r wr it ten consent of Cirrus Logic, Inc. The names of products of Cirrus Logic, Inc. or other vendors
and suppliers appearing in this document may be trademarks or service marks of their respective owners which may be registered in so me ju ris diction s. A list
of Cirrus Logic, Inc. trademarks and service marks can be found at http://www.cirrus.com.

2 DS284PP3

5.7.1 Master Clock Control (MCK) .................................................................................. 17

6. PIN DESCRIPTIONS — CS4220 ............................................................................................ 18

7. PIN DESCRIPTIONS — CS4221 ............................................................................................ 20

8. APPLICATIONS ..................................................................................................................... 22

8.1 Overview .......................................................................................................................... 22

8.2 Grounding and Power Supply Decoupling ....................................................................... 22

8.3 High Pass Filter ............................................................................................................... 22

8.4 Analog Outputs ................................................................................................................ 22

8.5 Master vs. Slave Mode .................................................................................................... 22

8.6 De-emphasis ................................................................................................................... 22

8.7 Power-up / Reset / Power Down Calibration ................................................................... 22

8.8 Control Port Interface (CS4221 only) .............................................................................. 23

8.8.1 SPI Mode ............................................................................................................ 23

8.8.2 I

8.9 Memory Address Pointer (MAP) ...................................................................................... 24

8.9.1 Auto-Increment Control (INCR) .............................................................................. 24

8.9.2 Register Pointer (MAP) .......................................................................................... 24

9. ADC/DAC FILTER RESPONSE ............................................................................................. 28

10. PARAMETER DEFINITIONS ................................................................................................ 29

11. PACKAGE DIMENSIONS .................................................................................................... 30

LIST OF FIGURES

CS4220 CS4221

2

C Mode ............................................................................................................. 23

Figure 1. Serial Audio Port Data I/O Timing .................................................................................. 7

Figure 2. SPI Control Port Timing ................................................................................................. 8

Figure 3. I

Figure 4. CS4220 Recommended Connection Diagram ............................................................. 10

Figure 5. CS4221 Recommended Connection Diagram ............................................................. 11

Figure 6. Control Port Timing, SPI mode .................................................................................... 24

Figure 7. Control Port Timing, I

Figure 8. Serial Audio Format 0 (I2S) .........................................................................................25

Figure 9. Serial Audio Format 1 .................................................................................................. 25

Figure 10. Serial Audio Format 2 ................................................................................................ 25

Figure 11. Serial Audio Format 3 ................................................................................................ 26

Figure 12. Optional Input Buffer .................................................................................................. 26

Figure 13. Single-ended Input Application .................................................................................. 26

Figure 14. 2- and 3-Pole Butterworth Filters ............................................................................... 27

Figure 15. Hybrid Digital/Analog Attenuation .............................................................................. 27

Figure 16. De-emphasis Curve ................................................................................................... 27

Figure 17. Hybrid Analog/Digital Attenuation .............................................................................. 27

Figure 18. ADC Filter Response ................................................................................................. 28

Figure 19. ADC Passband Ripple ............................................................................................... 28

Figure 20. ADC Transition Band ................................................................................................. 28

Figure 21. DAC Filter Response ................................................................................................. 28

Figure 22. DAC Passband Ripple ............................................................................................... 28

Figure 23. DAC Transition Band ................................................................................................. 28

2

C Control Port Timing .................................................................................................. 9

LIST OF TABLES

2

C mode ..................................................................................... 24

Table 1. Example Volume Settings............................................................................................... 15

Table 2. Common Clock Frequencies........................................................................................... 18

Table 3. Digital Interface Format - DIF1 and DIF0....................................................................... 19

Table 4. De-emphasis Control ...................................................................................................... 19

Table 5. Common Clock Frequencies........................................................................................... 20

DS284PP3 3

1. CHARACTERISTICS AND SPECIFICATIONS

CS4220 CS4221

ANALOG CHARACTERISTICS (T

Fs = 48 kHz; Measurement Bandwidth is 20 Hz to 20 kHz; Local components as shown in Figures 4 and 5; SPI
mode, Format 0, unless otherwise specified.)

Parameter Symbol

= 25° C; VA, VD = +5 V; Full Scale Input Sine wave, 997 Hz;

A

CS4220/1 - KS



UnitMin Typ Max

Analog Input Characteristics

ADC Resolution - - 24 Bits
Total Harmonic Distortion THD - 0.003 - %
Dynamic Range A-weighted

unweighted
Total Harmonic Distortion + Noise (Note 1) THD+N - -92 -87 dB
Interchannel Isolation (1 kHz) - 90 - dB
Interchannel Gain Mismatch - - 0.1 dB
Offset Error with High Pass Filter - - 0 LSB
Full Scale Input Voltage (Differential) 1.9 2.0 2.1 Vrms
Gain Drift - 100 - ppm/°C
Input Resistance 10 - - kΩ
Input Capacitance - - 15 pF
Common Mode Input Voltage - 2.3 - V

95
92

100

97

-

-

dB

A/D Decimation Filter Characteristics

Passband (Note 2) 0 - 21.8 kHz
Passband Ripple - - ±0.01 dB
Stopband (Note 2) 30 - 6114 kHz
Stopband Attenuation (Note 3) 80 - - dB
Group Delay (Fs = Output Sampl e Rate)

(Note 4)

Group Delay Variation vs. Frequency ∆t

t

gd

gd

-15/Fs- s

--0µs

High Pass Filter Characteristics

Frequency Response -3 dB (Note 2)

-0.1 dB
Phase Deviation @ 20 Hz (Note 2) - 10 - Degree
Passband Ripple - - 0 dB

-

-

3.7
20

-

-

Hz

Notes: 1. Referenced to typical full-scale differential input voltage (2 Vrms).

2. Filter characteristics scale with output sample rate. For output sample rates, Fs, other than 48 kHz, the

0.01 dB passband edge is 0.4535x Fs and the stopband edge is 0.625x Fs.

3. The analog modulator samples the input at 6.144 MHz for an Fs equal to 48 kHz. There is no rejection
of input signals which are multiples of the sampling frequency (n x 6.144 MHz ±21.8 kHz where
n = 0,1,2,3...).

4. Group delay for Fs = 48 kHz, t

4 DS284PP3

= 15/48 kHz = 312 µs.

gd

CS4220 CS4221

ANALOG CHARACTERISTICS (CONTINUED)

CS4220/1 - KS

Parameter Symbol

Analog Output Characteristics - Minimum Attenuation, 10 kΩ, 100 pF load; unless otherwise specified.

DAC Resolution - - 24 Bits
Signal-to-Noise, Idle-Channel Noise (CS4221 only) DAC

muted, A-weighted

Dynamic Range DAC not muted, A-weighted

DAC not muted, unweighted
Total Harmonic Distortion THD - 0.003 - %
Total Harmonic Distortion + Noise THD+N - -92 -87 dB
Interchannel Isolation (1 kHz) - 90 - dB
Interchannel Gain Mismatch - - 0.1 dB
Attenuation Step Size All Outputs 0.35 0.5 0.65 dB
Programmable Output Attenuation Span 110 113.5 - dB
Differential Offset Voltage - ±10 - mV

Common Mode Output Voltage - 2.4 - V
Full Scale Output Voltage 1.8 1.9 2.0 Vrms
Gain Drift - 100 - ppm/°

Out-of-Band Energy Fs/2 to 2 Fs - -60 - dBFs
Analog Output Load Resistance

Capacitance

97 105 - dB

95
92

10

-

100

97

-

-

-

-

-

100

Combined Digital and Analog Filter Characteristics

Frequency Response10 Hz to 20 kHz - ±0.1 - dB
Deviation from Linear Phase - ±0.5 - Degree
Passband: to 0.01 dB corner (Notes 5 and 6) 0 - 21.8 kHz
Passband Ripple (Note 6) - - ±0.01 dB
Stopband (Notes 5 and 6) 26.2 - - kHz
Stopband Attenuation (Note 7) 70 - - dB
Group Delay (Fs = Input Word Rate) t

gd

-16/Fs- s

Power Supply

Power Supply Current VA

VD

VL

Total Power Down

Power Supply Rejection Ratio 1 kHz - 65 - dB

-

-

-

-

46

9
3

0.4

60
20

5

-

UnitMin Typ Max

dB

C

kΩ
pF

mA

Notes: 5. The passband and stopband edges scale with frequency. For input word rates, Fs, other than 48 kHz,

the 0.01 dB passband edge is 0.4535x Fs and the stopband edge is 0.5465x Fs.

6. Digital filter characteristics.

7. Measurement bandwidth is 10 Hz to 3 Fs.

DS284PP3 5

CS4220 CS4221

DIGITAL CHARACTERISTICS (T

= 25° C; VA, VD = 4.75V - 5.25V)

A

Parameter Symbol Min Max Unit

High-level Input Voltage VL = 5V

VL = 3V
Low-level Input Voltage V
High-level Output Voltage at I

Low-level Output Voltage at I

= -2.0 mA V

O

= 2.0 mA V

O

V

IH

V

IH
IL

OH
OL

2.8

2.0

VL + 0.3
VL + 0.3

-0.3 0.8 V

VL - 1.0 - V

-0.5V

Input Leakage Current Digital Inputs - 10 µA
Output Leakage Current High Impedance Digital Outputs - 10 µA

ABSOLUTE MAXIMUM RATINGS (AGND, DGND = 0 V, all voltages with respect to 0 V.)

Parameter Symbol Min Max Unit

Power Supplies Digital

Analog
Input Current (Note 8) - ±10 mA
Analog Input Voltage (Note 9) -0.7 VA + 0.7 V
Digital Input Voltage (Note 9) -0.7 VD + 0.7 V
Ambient Temperature Power Applied -55 +125 °C
Storage Temperature -65 +150 °C

VD

VA

-0.3

-0.3

6.0

6.0

V
V

V

RECOMMENDED OPERATING CONDITIONS

(AGND, DGND = 0 V, all voltages with respect to 0 V.)

Parameter Symbol Min Typ Max Unit

Power Supplies Digital

Analog

Digital

| VA - VD |

Ambient Operating Temperature T

Notes: 8. Any pin except supplies. Transient currents of up to 100 mA on the analog input pins will not cause SCR

latch-up .

9. The maximum over or under voltage is limited by the input current.

WARNING: Operation at or beyond these limits may result in permanent damage to the device.

Normal operation is not guaranteed at these extremes.

VD

VA
VL

4.75

4.75

2.7

-

A

-10 25 70 °C

5.0

5.0

5.0

-

5.25

5.25

5.25

0.4

V

6 DS284PP3

CS4220 CS4221

SWITCHING CHARACTERISTICS (T

= 25° C; VA, VD = 4.75 V - 5.25 V; outputs loaded with

A

30 pF)

Parameter Symbol Min Typ Max Unit

Audio ADC’s and DAC’s Sample Rate Fs 4 - 50 kHz
XTI Frequency XTI = 256, 384, or 512 Fs 1.024 - 26 MHz
XTI Pulse Width High XTI = 512 Fs

XTI = 384 Fs
XTI = 256 Fs

XTI Pulse Width Low XTI = 512 Fs

XTI = 384 Fs
XTI = 256 Fs

13
21
31

13
21
31

-

-

-

-

-

-

-

ns

-

-

-

ns

-

-

XTI Jitter Tolerance - 500 - psRMS

Low Time (Note 10) 10 - - ms

RST

1

SCLK falling edge to SDOUT output valid DSCK = 0 t
LRCK edge to MSB valid t
SDIN setup time before SCLK rising edge DSCK = 0 t
SDIN hold time after SCLK rising edge DSCK = 0 t
SCLK Period t
SCLK High Time t
SCLK Low Time t
SCLK rising to LRCK edge DSCK = 0 t
LRCK edge to SCLK rising DSCK = 0 t

dpd
lrpd

ds

dh
sckw
sckh

sckl
lrckd
lrcks

-- ns

- - 45 ns
25 - - ns
25 - - ns

1

------------------- --­(128) Fs

40 - - ns
40 - - ns
35 - - ns
40 - - ns

------------------- ---20+
(384) Fs

--ns

Notes: 10. After powering up the CS4220/1, PDN should be held low for 10 ms to allow the power supply to settle.

LRCK

t

lrckd

SCLK*

SDIN

SDOUT

*SCLK shown for DSCK = 0, SCLK inverted for DSCK = 1.

t

lrpd

t

lrcks

t

sckh

t

ds

t

dh

MSB MSB-1

t

sckw

t

sckl

t

dpd

Figure 1. Serial Audio Port Data I/O Timing

DS284PP3 7

CS4220 CS4221

SWITCHING CHARACTERISTICS - CONTROL PORT - SPI MODE (CS4221)

(TA = 25° C; VA, VD = 4.75 V - 5.25 V; Inputs: Logic 0 = DGND, Logic 1 = VD; CL = 30 pF)

Parameter Symbol Min Max Unit

SPI Mode (SPI/I2C = 0)

CCLK Clock Frequency f

rising edge to CS falling (Note 11) t

RST
CCLK edge to CS

High Time between transmissions t

CS

falling to CCLK edge t

CS

falling (Note 12) t

CCLK Low Time t
CCLK High Time t
CDIN to CCLK rising setup time t
CCLK rising to DATA hold time (Note 13) t
Rise time of CCLK and CDIN (Note 14) t
Fall time of CCLK and CDIN (Note 14) t

Notes: 11. Not tested but guaranteed by design .

12. t

only needed before first falling edge of CS after RST rising edge. t

spi

13. Data must be held for sufficient time to bridge the transition time of CCLK.

14. For F

< 1 MHz.

SCK

sck
srs

spi
csh
css

scl

sch
dsu

dh

r2
f2

-6MHz

41 - µs

500 - ns

1.0 - µs
20 - ns
66 - ns
66 - ns
40 - ns
15 - ns

-100ns

-100ns

= 0 at all other times.

spi

RST

CS

CCLK

CDIN

t

srs

t

t

css

spi

tr2t

t

t

scl

t

f2

dsu

sch

t

dh

t

csh

Figure 2. SPI Control Port Timing

8 DS284PP3

CS4220 CS4221

SWITCHING CHARACTERISTICS - CONTROL PORT - I2C MODE (CS4221)

(TA = 25° C; VA, VD = 4.75 V - 5.25 V; Inputs: Logic 0 = DGND, Logic 1 = VD; CL = 30 pF)

Parameter Symbol Min Max Unit

I2C® Mode (SPI/I2C = 1)

SCL Clock Frequency f

rising edge to Start (Note 15)

RST

Bus Free Time between transmissions t
Start Condition Hold Time (prior to first clock pulse) t
Clock Low Time t
Clock High Time t
Setup time for repeated Start Condition t
SDA hold time for SCL falling (Note 16) t
SDA setup time to SCL rising t
Rise time of SCL t
Fall time of SCL t
Rise time of SDA t
Fall time of SDA t
Setup time for Stop Condition t

scl

t

irs

buf

hdst

low
high
sust

hdd
sud

rc
fc
rd
fd

susp

-100kHz

50 - µs

4.7 - µs

4.0 - µs

4.7 - µs

4.0 - µs

4.7 - µs
0-µs

250 - ns

-25ns

-25ns

-1µs

-300ns

4.7 - µs

Notes: 15. Not tested but guaranteed by design .

16. Data must be held for sufficient time to bridge the 300 ns transition time of SCL.

RST

t

irs

Stop Start

SDA

SCL

t

buf

t

t

hdst

low

t

hdd

t

high

t

sud

Repeated

Start

t

sust

t

t

hdst

Stop

rd

t

rc

t

fd

t

fc

t

susp

Figure 3. I2C Control Port Timing

DS284PP3 9

2. TYPICAL CONNECTION DIAGRAM — CS4220

CS4220 CS4221

+5V

Supply

Ferrite Bead

150

150

150

150

Mode Selection

R=500

s

* Required for

Master Mode only

Ω

+ 0.1 µF

1 µF

Ω

20

2.2 nF

AINL+

Ω

19

AINL-

Ω

17

16

10
11
27

1

14
15

28

AINR+

AINR-

DIF1

DIF0

RST

NC
NC

NC
NC

2.2 nF

Ω

Ω

2

21 6

VA VD

AOUTL+

AOUTL-

AOUTR+

AOUTR-

DEM1

DEM0

CS4220

SCLK
LRCK

SDOUT

AGND DGND

22 7

VL

XTI

XTO

SDIN

0.1 µF + 1µF

13

25

Digital Audio

40 pF

R

R
R

R

*

Ω

47 k

Analog Filter

Analog Filter

s

s
s

s

26
24

23
18

12

3

2

5
4
9
8

0.1 µF + 1µF

Source

40 pF

Eliminate the crystal
and capacitors when
using an external
clock input

Audio

DSP

+2.7 - 5V

External
Clock Input

Figure 4. CS4220 Recommended Connection Diagram

(Also see

Recommended Layout Diagram

)

10 DS284PP3

3. TYPICAL CONNECTION DIAGRAM — CS4221

CS4220 CS4221

+5V

Supply

Ferrite Bead

+ 0.1 µF

1 µF

Ω

150

Ω

150

Ω

150

Ω

150

Microcontroller AD0/CS

R = 500

s

* Required fo r

Master Mode only

Ω

20

2.2 nF
19

17

2.2 nF
16

10
11
12
27
18

1

14
15

28

Ω

2

21 6

VA VD

AINL+

AINL-

AINR+

CS4221

AINR-

SCL/CCLK
SDA/CDIN

RST
I2C/SPI

NC
NC

NC
NC

AGND DGND

22 7

VL

AOUTL+

AOUTL-

AOUTR+

AOUTR-

XTI

XTO

SCLK
LRCK

SDIN

SDOUT

0.1 µF + 1µF

13

25

40 pF

*
47 k

R
R
R
R

Ω

Analog Filter

Analog Filter

s
s
s
s

26
24

23

3

2

5
4
9
8

0.1 µF + 1µF

External

40 pF

Eliminate the crystal
and capacitorswhen
using an external
clock input

Audio

DSP

Clock Input

+2.7 - 5V

Figure 5. CS4221 Recommended Connection Diagram

(Also see

Recommended Layout Diagram

)

DS284PP3 11

CS4220 CS4221

4. REGISTER QUICK REFERENCE - CS4221

Addr Function 7 6 5 4 3 2 1 0

0h Reserved Reserved Reserved Reserved Reserved Reserved Reserved Reserved Reserved

default 0 0 0 0 0 0 0 0

1h ADC Control PDN HPDR HPDL ADMR ADML CAL CALP CLKE

default 0 0 0 0 0 0 0 0

2h DAC Control Reserved MUTC MUTR MUTL SOFT Reserved RMP1 RMP0

default 0 0 0 0 0 0 0 0

3h-4h Output Attenuator

Level

default 0 0 0 0 0 0 0 0

5h DSP Port Mode Reserved DEM1 DEM0 DSCK DOF1 DOF0 DIF1 DIF0

default 0 0 0 0 0 0 0 0

6h Converter Status

Report

default 0 0 0 0 0 0 0 0

7h Master Clock Con-

trol

default 0 0 0 0 0 0 0 0

ATT7 ATT6 ATT5 ATT4 ATT3 ATT2 ATT1 ATT0

ACCR ACCL LVR2 LVR1 LVR0 LVL2 LVL1 LVL0

Reserved Reserved Reserved Reserved Reserved Reserved MCK1 MCK0

12 DS284PP3

CS4220 CS4221

5. REGISTER DESCRIPTIONS - CS4221

Note: All registers are read/write in I2C mode and write-only in SPI mode, unless otherwise noted.

5.1 ADC Control (address 01h)

76543210

PDN HPDR HPDL ADMR ADML CAL CALP CLKE

00000000

5.1.1 POWER DOWN ADC (PDN)

Default = 0
0 - Disabled
1 - Enabled

Function:

The ADC will enter a low-power state when this function is enabled.

5.1.2 LEFT AND RIGHT CHANNEL HIGH PASS FILTER DEFEAT (HPDR-HPDL)

Default = 0
0 - Disabled
1 - Enabled

Function:

The internal high-pass filter is defeated when this function is enabled. Control of the internal high­pass filter is independent for the left and right channel.

5.1.3 LEFT AND RIGHT CHANNEL ADC MUTING (ADMR-ADML)

Default = 0
0 - Disabled
1 - Enabled

Function:

The output for the selected ADC channel will be muted when this function is enabled.

5.1.4 CALIBRATION CONTROL (CAL)

Default = 0
0 - Disabled
1 - Enabled

Function:

The device will automatically perform an offset calibration when brought out of reset, which last ap­proximately 50 ms. When this function is enabled, a rising edge on the reset line will initiate an offset
calibration.

5.1.5 CALIBRATION STATUS (CALP) (READ ONLY)

Default = 0
0 - Calibration done
1 - Calibration in progress

DS284PP3 13

CS4220 CS4221

5.1.6 CLOCKING ERROR (CLKE) (READ ONLY)

Default = 0
0 - No error
1 - Error

5.2 DAC Control (address 02h)

76543210

Reserved

00000000

MUTC MUTR MUTL SOFT

Reserved

5.2.1 MUTE ON CONSECUTIVE ZEROS (MUTC)

Default = 0
0 - Disabled
1 - Enabled

Function:

The DAC output will mute following the reception of 512 consecutive audio samples of static 0 or -1
when this function is enabled. A single sample of non-static data will release the mute. Detection and
muting is done independently for each channel. The muting function is affected, similar to volume
control changes, by the SOFT bit in the DAC Control register.

RMP1 RMP0

5.2.2 MUTE CONTROL (MUTR-MUTL)

Default = 0
0 - Disabled
1 - Enabled

Function:

The output for the selected DAC channel will be muted when this function is enabled. The muting
function is affected, similar to volume control changes, by the SOFT bit in the DAC Control register.

5.2.3 SOFT RAMP CONTROL (SOFT)

Default = 0
0 - Soft Ramp level changes
1 - Zero Cross level changes

Function:

Soft Ramp level changes will be implemented by incrementally ramping, in 0.5 dB steps, from the cur­rent level to the new level. The rate of change defaults to 0.5 dB per 8 left/right clock periods and is
adjustable through the RMP bits in the DAC Control register.

Zero Cross level changes will be implemented in a single step from the current level to the new level.
The level change takes effect on a zero crossing to minimize audible artifacts. If the signal does not
encounter a zero crossing, the level change will occur after a timeout period of 512 sample periods
(10.7 ms at 48 kHz sample rate). Zero crossing is independently monitored and implemented for each
channel. The ACCR and ACCL bits in the Converter Status Report register indicate when a level
change has occurred for the right and left channel.

14 DS284PP3

CS4220 CS4221

5.2.4 SOFT RAMP STEP RATE (RMP)

Default = 00
00 - 1 step per 8 LRCK’s
01 - 1 step per 4 LRCK’s
10 - 1 step per 16 LRCK’s
11 - 1 step per 32 LRCK’s

Function:

The rate of change for the Soft Ramp function is adjustable through the RMP bits.

5.3 Left Channel Output Attenuator Level (address 03h)

5.4 Right Channel Output Attenuator Level (address 04h)

76543210

ATT7 ATT6 ATT5 ATT4 ATT3 ATT2 ATT1 ATT0

00000000

5.4.1 ATTENUATION LEVEL (ATT7-ATT0)

Default = 00h

Function:

The Output Attenuator Level registers allow for attenuation of the DAC outputs in 0.5 dB increments
from 0 to 113.5 dB. Level changes are implemented with an analog volume control until the residual
output noise is equal to the noise floor in the mute state. At this point, volume changes are performed
digitally. This technique is superior to purely digital volume control because the noise is attenuated
by the same amount as the signal, thus preserving dynamic range, see Figure 16. Volume changes
are performed as dictated by the SOFT bit in the DAC Control register. ATT0 represents 0.5 dB of
attenuation and settings greater than 227 (decimal value) will mute the selected DAC output.

Binary Code Decimal Value Volume Setting

00000000 0 0 dB

11100011 227 -113.5 dB
11100100 228 Muted

Table 1. Example Volume Settings

DS284PP3 15

CS4220 CS4221

5.5 DSP Port Mode (address 05h)

76543210

Reserved

00000000

5.5.1 DE-EMPHASIS CONTROL (DEM)

Function:

5.5.2 SERIAL INPUT/OUTPUT DATA SCLK POLARITY SELECT (DSCK)

DEM1 DEM0 DSCK DOF1 DOF0 DIF1 DIF0

Default = 00
00 - 44.1 kHz de-emphasis setting
01 - 48 kHz de-emphasis setting
10 - 32 kHz de-emphasis setting
11 - De-emphasis disabled

Selects the appropriate digital filter to maintain the standard 15 µs/50 µs digital de-emphasis filter re­sponse at 32, 44.1 or 48 kHz sample rates, see Figure 15.

Default = 0
0 - Data valid on rising edge of SCLK
1 - Data valid on falling edge of SCLK

Function:

This function selects the polarity of the SCLK edge used to clock data in and out of the serial audio
port.

5.5.3 SERIAL DATA OUTPUT FORMAT (DOF)

Default = 00

2

S compatible

00 - I
01 - Left justified
10 - Right justified, 24-bit
11 - Right justified, 20-bit

Function:

The required relationship between the left/right clock, serial clock and output serial data is defined by
the Serial Data Output Format, and the options are detailed in Figures 8-11.

Note: If the format selected is Right-Justified, SCLK must be 64 Fs when operating in slave mode.

5.5.4 SERIAL DATA INPUT FORMAT (DIF)

Default = 00

2

S compatible

00 - I
01 - Left justified
10 - Right justified, 24-bit
11- Right justified, 20-bit

Function:

The required relationship between the left/right clock, serial clock and input serial data is defined by
the Serial Data Input Format, and the options are detailed in Figures 8-11.

16 DS284PP3

CS4220 CS4221

5.6 Converter Status Report (Read Only) (address 06h)

76543210

ACCR ACCL LVR2 LVR1 LVR0 LVL2 LVL2 LVL0

00000000

5.6.1 LEFT AND RIGHT CHANNEL ACCEPTANCE BIT (ACCR-ACCL)

Default = 0
0 - Requested setting valid
1 - New setting loaded

Function:

The ACCR and ACCL bits indicate when a change in the Output Attenuator Level has occurred for
the left and right channels, respectively. The value will be high when a new setting is loaded into the
Output Attenuator Level registers. The value will return low when the requested attenuation setting
has taken effect.

5.6.2 LEFT AND RIGHT CHANNEL ADC OUTPUT LEVEL (LVR AND LVL)

Default = 000
000 - Normal output levels
001 - -6 dB level
010 - -5 dB level
011 - -4 dB level
100 - -3 dB level
101 - -2 dB level
110 - -1 dB level
111 - Clipping

Function:

The analog-to-digital converter is continually monitoring the peak digital signal output for both the left
and right channel, prior to the digital limiter. The maximum output value is stored in the LVL and LVR

bits. The LVL and LVR bits are ‘sticky’, so they are reset after each read is performed.

5.7 Master Clock Control (address 07h)

76543210

Reserved Reserved Reserved Reserved Reserved Reserved MCK1 MCK0

00000000

5.7.1 MASTER CLOCK CONTROL (MCK)

Default = 00
00 - XTI = 256 Fs for Master Mode
01 - XTI = 384 Fs for Master Mode
10 - XTI = 512 Fs for Master Mode

Function:

The MCK bits allow for control of the Master Clock, XTI, input frequency.
Note: These bits are not valid when operating in slave mode.

DS284PP3 17

6. PIN DESCRIPTIONS — CS4220

XTO

XTO

LRCK

LRCK

SCLK

SCLK

DGND

DGND

SDIN

SDIN

DIF1

DIF1
DIF0

DIF0

CS4220

CS4220

1

1

NC

NC

2

2

XTI

XTI

3

3
4

4
5

5

VD

VD

6

6
7

7
821

821
9

9

10

10

11

11
12 17

12 17

13

VL

13

VL

14 15

14 15

28

28
27

27
26

26
25

25
24

24
23

23
22

22

20

20

19

19

18

18

16

16

NC

NC

RST

RST
AOUTL-

AOUTL-

AOUTL+

AOUTL+

AOUTR+

AOUTR+
AOUTR-

AOUTR-

AGND

AGND

VASDOUT

VASDOUT
AINL+

AINL+
AINL-

AINL­DEM1

DEM1
AINR+DEM0

AINR+DEM0
AINR-

AINR­NCNC

NCNC

CS4220 CS4221

NC 1,14,15, 28 No Connect - These pins are not connected internally and should be tied to DGND to mini-

mize noise coupling.

XTI, XTO 2,3 Crystal Connections (

Input/Output

) - Input and output connections for the crystal used to

clock the CS4220. Alternatively, a clock may be input into XTI. This is the clock source for the
delta-sigma mod ulator and d igital filters. The frequency of this clo ck must be ei ther 256x, 38 4x,
or 512x Fs in Slave Mode and 256x in Master Mode.

Fs (kHz) XTI (MHz)

256x 384x 512x

32 8.1920 12.2880 16.3840

44.1 11.2896 16.9344 22.5792
48 12.2880 18.4320 24.5760

Table 2. Common Clock Frequencies

Input

LRCK 4 Left/Right Clock (

serial audio data pi ns SDIN/SDOUT. The frequency of the Left/Right c lock must be equal to the
input sample rate. Although the outputs for each ADC channel are transmitted at different
times, Left/Right pai r s re pres en t sim ul taneously sample d ana lo g inputs. The required relation­ship between the left/right clock, serial clock and serial data is defined by the DIF1-0 pins. The
options ar e detailed in Figures 8 - 11.

SCLK 5 Serial Data Clock (

out of the SDOUT pin. The required relationship between the left/right clock, serial clock and
serial data is defined by the DIF1-0 pins. The options are detailed in Figures 8 - 11.

VD 6 Digital Power (

Input

DGND 7 Digital Ground (
SDOUT 8 Serial Data Output (

The required relationship betwee n the le ft/ri ght cl oc k, serial clock and serial dat a is defi ne d by
the DIF1-0 pins. The options are detailed in Figures 8 - 11.

SDIN 9 Serial Data Input (

required relationship between the left/right clock, serial clock and serial data is defined by the
DIF1-0 pins. The options are detailed in Figures 8 - 11.

) - Determines which channel is currently being input/output of the

Input

) - Clocks the individual bits of the serial data into the SDIN pin and

) - Positive power supply for the digital section. Typically 5.0 VDC.

Input

) - Digital ground for t he dig it a l sec tion .

Output

) - Two’s complement MSB-first serial data is output on this pin.

Input

) - Two’s complement MSB-first serial data is input on this pin. The

18 DS284PP3

CS4220 CS4221

DIF0, DIF1 10,11 Digital Interface Format (

clock and serial data is defined by the Digital Interface Format. The options are detailed in Fig­ures 8 - 11.

DIF1 DIF0 DESCRIPTION FORMAT FIGURE

00
0 1 Left Justified, up to 24-bit data 1 9

1 0 Right Justified, 24-bit Data 2 10
1 1 Right Justified, 20-bit Data 3 11

2

I

S, up to 24-bit data

Input

) - The required relationship be tween the left/ right clock , serial

Table 3. Digital Interface Format - DIF1 and DIF0

Input

DEM0, DEM1 12,18 De-Emphasis Select (

filter. 32, 44.1, or 48 kHz sample rate selection defined in Table 4.

DEM0 DEM1 De-Emphasis

0 0 32 kHz
0 1 44.1 kHz
1 0 48 kHz
1 1 Disabled

) - Controls the activation of the standard 50/15 µs de-emphasis

Table 4. De-emphasis Control

VL 13 Digital Logic Power (

3.0 to 5.0 VDC.

AINR-, AINR+ 16,17 Differential Right Channel Analog Input (

tial) is specified in the Ana log Charac teristic s specifi cation t able and m ay be AC couple d or DC
coupled into the device, see Figure 12 for optional line input buffer.

AINL-, AINL+ 19,20 Differential Left Channel Analog Input (

is specified in the Analog Characteristics specification table and may be AC coupled or DC
coupled into the device, see Figure 12 for optional line input buffer.

VA 21 Analog Power (
AGND 22 Analog Ground (
AOUTR-,

AOUTR+
AOUTL-, AOUTL+ 25, 26 Differential Left Channel Analog Output (

RST 27 Reset (

23, 24 Differential Right Channel Analog Output (

ferential) is specified in the Analog Characteristics specification table.

ential) is specified in the Analog Characteristics specification table.

Input

) - When low, the device enters a low power mode and all internal registers are

reset, including the control port. When high, the control port becomes operational and normal
operation will occur.

Input

) - Positive power supply for the digital interface section. Typically

Input

Input

) - Positive power supply for the analog section. Nominally +5 Volts.

Input

) - Analog ground reference.

08

Input

) - The full scale analog input level (differen-

) - The full scale analog input level (differentia l)

Output

) - The full scale analog output level (dif-

Output

) - The full scale analog output level (differ-

DS284PP3 19

7. PIN DESCRIPTIONS — CS4221

LRCK

SCLK

DGND

SCL/CCLK

SDA/CD IN

NC

XTO

XTI

VD

SDIN

VL

CS4221

1
2
3
4
5
6
7
821
9

10

11
12 17

13

14 15

28
27
26
25
24
23
22

20

19

18

16

NC

RST
AOUTL-

AOU TL+

AOUTR+
AOUTR-

AGND

VASDOUT
AINL+
AINL­I2C/SPI
AINR+AD0/CS
AINR­NCNC

CS4220 CS4221

NC 1,14,15, 28 No Connect - These pins are not connected internally and should be tied to DGND to mini-

mize noise coupling.

XTI, XTO 2,3 Crystal Connections (

Input/Output

) - Input and output connections for the crystal used to

clock the CS4221. Alte rnatively a clock ma y b e in put into XTI. This is the clo ck so urc e for the
delta-sigma modulator and digita l filter s. The frequ ency of th is clock must be e ither 256x, 38 4x,
or 512x Fs. The default XTI setting in Master Mode is 256x, but this may be changed to 384x
or 512x through the Control Port.

Fs (kHz) XTI (MHz)

256x 384x 512x

32 8.1920 12.2880 16.3840

44.1 11.2896 16.9344 22.5792
48 12.2880 18.4320 24.5760

Table 5. Common Clock Frequencies

LRCK 4 Left/Right Clock (

serial audio data pi ns SDIN/SDOUT. The frequency of the Left/Right c lock must be equal to the
input sample rate. Although the outputs for each ADC channel are transmitted at different
times, Left/Right pai r s re pres en t sim ul taneously sample d ana lo g inputs. The required relation­ship between the left/right clock, serial clock and serial data is def ined by the DSP Port Mode
(05h) register. The options are detailed in Figures 8 - 11.

SCLK 5 Serial Data Clock (

out of the SDOUT pin. The required relationship between the left/right clock, serial clock and
serial data is def ined by the DSP Port Mod e (05h) re giste r. The options a re det ailed in Figu res
8 - 11.

VD 6 Digital Power (
DGND 7 Digital Ground (
SDOUT 8 Serial Data Output (

The required relationship betwee n the le ft/ri ght cl oc k, serial clock and serial dat a is defi ne d by
the DSP Port Mode (05h) register. The options are detailed in Figures 8 - 11.

Input

) - Determines which channel is currently being input/output of the

Input

) - Clocks the individual bits of the serial data into the SDIN pin and

Input

) - Positive power supply for the digital section. Typically 5.0 VDC.

Input

) - Digital ground for the digital section.

Output

) - Two’s complement MSB-first serial data is output on this pin.

20 DS284PP3

CS4220 CS4221

SDIN 9 Serial Data Input (

required relationship between the left/right clock, serial clock and serial data is defined by the
DSP Port Mode (05h) register. The options are detailed in Figures 8 - 11.

SCL/CCLK 10 Serial Control Port Clock (

SDA/CDIN 11

AD0/CS 12

VL 13 Logic Power (

AINR-, AINR+ 16,17 Differential Right Channel Analog Input (

I2C/SPI

AINL-, AINL+ 19,20 Differential Left Channel Analog Input (

VA 21 Analog Power (
AGND 22 Analog Ground (
AOUTR-,

AOUTR+
AOUTL-,

AOUTL+
RST 27 Reset (

18 Control Port Format (

23, 24 Differential Right Channel Analog Outputs (

25, 26 Differential Left Channel Analog Outputs (

2

In I

C mode, SCL requires an external pull-up resistor according to the I2C specification.

Serial Control Port Data (

external pull-up resistor according to the I
serial control port in SPI mode.

Address Bit/Control Chip Select (

mode, CS
interface is defined by the SPI

5.0 VDC.

tial) is specified in the Ana log Charac teristic s specifi cation t able and m ay be AC couple d or DC
coupled into the device, see Figure 12 for optional line input buffer.

selected.

is specified in the Analog Characteristics specification table and may be AC coupled or DC
coupled into the device, see Figure 12 for optional line input buffer.

ferential) is specified in the Analog Characteristics specification table.

ferential) is specified in the Analog Characteristics specification table.

is used to enable the c ontrol port interfac e on the CS422 1. The CS4 221 co ntrol po rt

Input

reset, including the control port. When high, the control port becomes operational and normal
operation will occur.

Input

) - Two’s complement MSB-first serial data is input on this pin. The

Input

) - Clocks the serial control bits into and out of the CS4221.

Input/Output

/I2C pin.

Input

) - Positive power supply for the digital interface section. Typically 3.0 to

Input

) - When this pin is high, I2C mode is selected, when low, SPI is

)- SDA is a data I/O line in I2C mode and requires an

2

Input

) - In I2C mode, AD0 is a chip address bit. In SPI

Input

Input

) - Positive power supply for the analog section. Typically 5.0 VDC.

Input

) - Analog ground reference.

) - When low, the device enters a low power mode and all internal registers are

C specification. CDIN in the input data line for the

Input

) - The full scale analog input level (differen-

) - The full scale a nalog input l evel (dif ferenti al)

Output

) - The full scale ana log outp ut le ve l (dif-

Output

) - The full scale analog output level (dif-

DS284PP3 21

CS4220 CS4221

8. APPLICATIONS

8.1 Overview

The CS4220 is a stand-alone device controlled
through dedicated pins. The CS4221 is controlled
with an external microcontroller using the serial
control port.

8.2 Grounding and Power Supply Decoupling

As with any high resolution converter, the
CS4220/1 requires careful attention to power sup­ply and grounding arrangements to optimize per­formance. Figures 4 and 5 shows the
recommended power arrangement with VA, VD
and VL connected to clean supplies. Decoupling
capacitors should be located as close to the device
package as possible. If desired, all supply pins may
be connected to the same supply, but a decoupling
capacitor should still be used on each supply pin.

8.3 High Pass Filter

The operational amplifiers in the input circuitry
driving the CS4220/1 may generate a small DC off­set into the A/D converter. The CS4220/1 includes
a high pass filter after the decima tor to remov e any
DC offset which could result in recording a DC lev­el, possibly yielding "clicks" when switching be­tween devices in a multichannel system.

8.4 Analog Outputs

The recommended off-chip analog filter is e ither a
2nd order Butterworth or a 3rd order Butterworth,
if greater out-of-band noise filtering is desired. The
CS4220/1 DAC interpolation filter has been pre­compensated for an external 2nd order Butterworth
filter with a 3 dB corner at Fs, or a 3rd order But­terworth filter with a 3 dB corner at 0.75 Fs to pro­vide a flat frequency response and linear phase over
the passband (see Figure 14 for Fs = 48 kHz). If the
recommended filter is not used, small frequency re­sponse magnitude and phase errors will occur. In
addition to providing out-of-band noise attenua-

tion, the output filters shown in Figure 14 provide
differential to single-ended conversion.

8.5 Master vs. Slave Mode

The CS4220/1 may be operated in either master
mode or slave mode. In master mode, SCLK and
LRCK are outputs which are internally derived
from MCLK. The device will operate in master
mode when a 47 kΩ pulldown resistor is present on
SDOUT at startup or after reset, see Figure 5.
LRCK and SCLK are inputs to the CS4220/1 when
operating in slave mode. See Figures 8-11 for the
available clocking modes.

8.6 De-emphasis

The CS4220/1 includes digital de-emphasis for 32,

44.1, or 48 kHz sample rates. The frequency re­sponse of the de-emphasis curve, as shown in Fig­ure 15, will scale proportionally with changes in
samples rate, Fs. The de-emphasis feature is in­cluded to accommodate older audio recordings that
utilize pre-emphasis as a means of noise reduction.

De-emphasis control is achieved with the DEM1/0
pins on the CS4220 or through the DEM1-0 bits in
the DSP Port Mode Byte (#5) on the CS4221.

8.7 Power-up / Reset / Power Down Calibration

Upon power up, the user should hold RST = 0 for
approximately 10 ms. In this state, the control port
is reset to its default settings and the part remains in
the power down mode. At the end of RST, the de­vice performs an offset calibration which lasts ap­proximately 50 ms after which the device enters
normal operation. In the CS4221, a calibration may
also be initiated via the CAL bit in the ADC Con­trol Byte (#1). The CALP bit in the ADC Control
Byte is a read only bit indicating the status of the
calibration.

Reset/Power Down is achieved by lowering the
RST pin causing the part to enter power down.

22 DS284PP3

CS4220 CS4221

Once RST goes high, the control port is functional
and the desired settings should be loaded.

The CS4220/1 will also enter power down mode if
the master clock source stops for approximately

10 µ s or if the LRCK is not synchronous to the
master clock. The control port will re tain its current
settings.

The CS4220/1 will mute the analog output s and en­ter the power down mode if the supply drops below
approximately 4 volts.

8.8 Control Port Interface (CS4221 only)

The control port is used to load all the internal set­tings. The operation of the control port may be
completely asynchronous with the audio sample
rate. However, to avoid potential interference prob­lems, the control port pins should remain static if
no operation is required.

The control port has 2 modes: SPI and I2C, with
the CS4221 operating as a slave device. The con­trol port interface format is selected by the SPI/I2C
pin.

8.8.1 SPI Mode

In SPI mode, CS is the CS4221 chip select signal,
CCLK is the control port bit cl ock, C DIN i s the in­put data line from the microcontroller and the chip
address is 0010000. All signals are inputs and data
is clocked in on the rising edge of CCLK.

The CS4221 has a MAP auto increment capability,
enabled by the INCR bit in the MAP register. If
INCR is a zero, then the MAP will stay constant for
successive writes. If INCR is set to a 1, then MAP
will auto increment after each byte is written, al­lowing block writes of successive registers. Regis­ter reading from the CS4221 is not supported in the
SPI mode.

8.8.2 I2C Mode

In I2C mode, SDA is a bidirectional data line. Data
is clocked into and out of the part by the clock,
SCL, with the clock to data relationship as shown
in Figure 7. There is no CS pin. Pin AD0 forms the
partial chip address and should be tied to VD or
DGND as desired. The upper 6 bits of the 7 bit ad­dress field must be 001000. In order to communi­cate with the CS4221, the LSB of the chip address
field (first byte sent to the CS4221) should match
the setting of the AD0 pin. The eighth bit of the ad­dress byte is the R/W bit (high for a read, low for a
write). If the operation is a write, the next byte is
the Memory Address Pointer which selects the reg­ister to be read or written. If the operation is a read,
the contents of the register pointed to by the Mem­ory Address Pointer will be output. Setting the auto
increment bit in MAP, allows successive reads or
writes of consecutive registers. Each byte is sepa­rated by an acknowledge bit.

Figure 6 shows the operation of the control port in
SPI mode. To write to a register, bring CS low. The
first 7 bits on CDIN form the chip address, and
must be 0010000. The eighth bit is a read/write in­dicator (R/W), which must be low to write. Regis­ter reading from the CS4221 is not supported in the
SPI mode. The next 8 bits form the Memory Ad­dress Pointer (MAP), which is set to the address of
the register that is to be updated. The next 8 bits are
the data which will be placed into a register desig­nated by the MAP.

DS284PP3 23

CS4220 CS4221

8.9 Memory Address Pointer (MAP)

76543210

INCR

00000000

Reserved Reserved Reserved Reserved

8.9.1 AUTO-INCREMENT CONTROL (INCR)

Default = 0
0 - Disabled
1 - Enabled

8.9.2 REGISTER POINTER (MAP)

Default = 000

CS

CCLK

CHIP

CDIN

ADDRESS

0010000 R/W

MAP DATA

MAP2 MAP1 MAP0

MSB LSB

byte 1 byte n

MAP = Memory Address Pointer

Figure 6. Control Port Timing, SPI mode

SDA

SCL

001000

Start Stop

ADDR
AD0

R/W

ACK DATA 1-8 ACK DATA 1-8 ACK

Figure 7. Control Port Timing, I2C mode

24 DS284PP3

CS4220 CS4221

LRCK

SCLK

SDATA +3 +2 +1

MSB

-1 -2 -3 -4 -5

Left Channel

+5 +4

LSB

Master Slave

I2S, up to 24-bit data
XTI = 256, 384, 512 Fs (CS4223 - 256 Fs only)
LRCK = 4 to 50 kHz
SCLK = 64 Fs

Figure 8. Serial Audio Format 0 (I2S)

LRCK

SCLK

SDATA +3 +2 +1

MSB

-1 -2 -3 -4 -5

Left Channel

+5 +4

LSB

Right Channel

+3 +2 +1

MSB

-1 -2 -3 -4

2

S, up to 24-bit data

I

+5 +4

LSB

XTI = 256, 384, 512 Fs
LRCK = 4 to 50 kHz
SCLK = 48,64, 128 Fs

Right Channel

+3 +2 +1

MSB

-1 -2 -3 -4

+5 +4

LSB

Master Slave

Left-justified, up to 24-bit data
XTI = 256, 384, 512 Fs (CS4223 - 256 Fs only)
LRCK = 4 to 50 kHz
SCLK = 64 Fs

Figure 9. Serial Audio Format 1

LRCK

SCLK

SDATA

0

Left Channel

23 22 21 20 19 18

32 clocks

65432107

Master Slave

Right-justified, 24-bit data
XTI = 256, 384, 512 Fs (CS4223 - 256 Fs only)
LRCK = 4 to 50 kHz
SCLK = 64 Fs

Figure 10. Serial Audio Format 2

Left-justified, up to 24-bit data
XTI = 256, 384, 512 Fs
LRCK = 4 to 50 kHz
SCLK = 48, 64, 128 Fs

Right Channel

23 22 21 20 19 18

65432107

Right-justified, 24-bit data
XTI = 256, 384, 512 Fs
LRCK = 4 to 50 kHz
SCLK = 64 Fs

DS284PP3 25

CS4220 CS4221

LRCK

SCLK

SDATA

10

17 16 17 16

19 18 19 18

Left Channe l

15 14 13 12 11 10

32 clocks

6543210987

Master Slave

Right-justified, 20-bit data
XTI = 256, 384, 512 Fs (CS4223 - 256 Fs only)
LRCK = 4 to 50 kHz
SCLK = 64 Fs

Figure 11. Serial Audio Format 3

Right Channel

15 14 13 12 11 10

6543210987

Right-justified, 20-bit data
XTI = 256, 384, 512 Fs
LRCK = 4 to 50 kHz
SCLK = 64 Fs

Figure 12. Optional Input Buffer

Ω

150

10 µF

+

AINR+

2.2 nF

Input

CS4223/4

AINR-

4.7 µF

+

0.1 µF

Figure 13. Single-ended Input Application

26 DS284PP3

CS4220 CS4221

Figure 15. De-emphasis Curve

Figure 14. 2- and 3-Pole Butterworth Filters

Gain
dB

Analog Digital

0

Signal

Noise

Amplitude (dB)

0 -113.5

Attenuation (d B)

0 dB

-10 dB

T1 = 50 µs

F1 F2

T2 = 15 µs

Frequency

Figure 16. Hybrid Analog/Digital Attenuation

DS284PP3 27

9. ADC/DAC FILTER RESPONSE

Figure 17. ADC Filter Response Figure 18. ADC Passband Ripple

CS4220 CS4221

Figure 19. ADC Transition Band Figure 20. DAC Filter Response

Figure 21. DAC Passband Ripple Figure 22. DAC Transition Band

28 DS284PP3

10.PARAMETER DEFINITIONS

Dynamic Range

The ratio of the full scale rms value of the signal to the rms sum of all other spectral components over the
specified bandwidth. Dynamic range is a signal-to-noise measurement over the specified bandwidth
made with a -60 dBFS signal. 60 dB is then added to the resulting measurement to refer the measurement
to full scale. This technique ensures that the distortion components are below the noise level and do not
affect the measurement. This measurement technique has been accepted by the Audio Engineering So­ciety, AES17-1991, and the Electronic Industries Association of Japan, EIAJ CP-307.

Total Harmonic Distortion + Noise

The ratio of the rms value of the signal to the rms sum of all other spectral components over the specified
bandwidth (typically 20 Hz to 20 kHz), including distortion components. Expressed in decibels. ADCs are
measured at -1 dBFS as suggested in AES17-1991 Annex A and DACs are measured at 0 dBFS.

Idle Channel Noise / Signal-to-Noise-Ratio

The ratio of the rms analog output level with 1 kHz full scale digital input to the rms analog output level
with all zeros into the digital input. Measured A-weighted over a 10 Hz to 20 kHz bandwidth. Units in deci­bels. This specification has been standardized by the Audio Engineering Society, AES17-1991, and re­ferred to as Idle Channel Noise. This specification has also been standardized by the Electronic Industries
Association of Japan, EIAJ CP-307, and referred to as Signal-to-Noise-Ratio.

CS4220 CS4221

Total Harmonic Distortion (THD)

THD is the ratio of the test signal amplitude to the rms sum of all the in-band harmonics of the test signal.
Units in decibels.

Interchannel Isolation

A measure of crosstalk between channels. Measured for each channel at the converter’s output with no
signal to the input under test and a full-scale signal applied to the other channel. Units in decibels.

Frequency Response

A measure of the amplitude response variation from 20 Hz to 20 kHz relative to the amplitude response
at 1 kHz. Units in decibels.

Interchannel Gain Mismatch

For the ADCs, the difference in input voltage that generates the full scale code for each channel. For the
DACs, the difference in output voltages for each channel with a full scale digital input. Units are in deci­bels.

Gain Error

The deviation from the nominal full scale output for a full scale input.

Gain Drift

The change in gain value with temperature. Units in ppm/°C.

Offset Error

For the ADCs, the deviation in LSB's of the output from mid-scale with the selected inputs tied to a com­mon potential. For the DAC's, the differential output voltage with mid-scale input code. Units are in volts.

DS284PP3 29

11.PACKAGE DIMENSIONS

28L SSOP PACKAGE DRAWING

N

CS4220 CS4221

D

E

A2

A

E1

1

∝

2

b

SIDE VIEW

1

23

e

TOP VIEW

INCHES MILLIMETERS NOTE

DIM MIN NOM MAX MIN NOM M AX

A -- -- 0.084 -- -- 2.13
A1 0.002 0.006 0.010 0.05 0.15 0.25
A2 0.064 0.069 0.074 1.62 1.75 1.88

b 0.009 -- 0.015 0.22 -- 0.38 2,3

D 0.390 0.4015 0.413 9.90 10.20 10.50 1

E 0.291 0.307 0.323 7.40 7.80 8.20
E1 0.197 0.209 0.220 5.00 5.30 5.60 1

e 0.022 0.026 0.030 0.55 0.65 0.75

L 0.025 0.0354 0.041 0.63 0.90 1.03

∝

0° 4° 8° 0° 4° 8°

A1

SEATING

PLANE

L

END VIEW

JEDEC #: MO-150

Controlling Dimension is Millimeters

Notes: 1. “D” and “E1” are reference datums and do not included mold flash or protrusions, but do include mold

mismatch and are measured at the parting line, mold flash or protrusions shall not exceed 0.20 mm per
side.

2. Dimension “b” does not include dambar protrusion/intrusion. Allowable dambar protrusion shall be

0.13 mm total in excess of “b” dimension at maximum material condition. Dambar intrusion shall not
reduce dimension “b” by more than 0.07 mm at least material condition.

3. These dimensions apply to the flat section of the lead between 0.10 and 0.25 mm from lead tips.

30 DS284PP3

• Notes •