Cirrus Logic CS5381 User Manual
CS5381
120 dB, 192 kHz, Multi-Bit Audio A/D Converter
Features
! Advanced Multi-bit Delta-Sigma Architecture
! 24-bit Conversion
! 120 dB Dynamic Range
! -110 dB THD+N
! Supports All Audio Sample Rates Including
192 kHz
! 260 mW Power Consumption
! High-Pass Filter or DC Offset Calibration
! Supports Logic Levels between 5 and 2.5 V
! Differential Analog Architecture
! Low-Latency Digital Filtering
! Overflow Detection
! Pin-Compatible with the CS5361
General Description
The CS5381 is a complete an alog-to-digital converter
for digital audio systems. It perfor ms sa mplin g, an alog 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 216 kHz per channel.
The CS5381 uses a 5th-order, multi-bit delta-sigma
modulator followed by digital filtering and decimation,
which removes the need for an external anti-alias filter.
The ADC uses a differential architecture which provides
excellent noise rejection.
The CS5381 is available in 24-pin TSSOP and SOIC
packages for Commercial grade (-10° to +70° C). The
CDB5381 Customer Demonstration board is also available for device evaluation and implementation
suggestions. Please refer to the “Ordering Information”
on page 22.
The CS5381 is ideal for audio systems requiring wide
dynamic range, negligible distortion, and low noise such as A/V receivers, DVD-R, CD-R, digital mixing
consoles, and effects processors.
Differential
Inputs
Differential
Inputs
http://www.cirrus.com
Analog Su p ply
5 V
Interna l Voltage
Reference
Switch-Cap
ADC
Switch-Cap
ADC
Digital Supply
3.3 V to 5 V
Digital
Filters
Digital
Filters
Copyright © Cirrus Logic, Inc. 2005
(All Rights Reserved)
Interfac e Supply
2.5 V to 5 V
Level Translator
Reset
Mode
Configuration
HPF
OVFL
PCM Serial
Audio Output
JULY '05
DS563F2
TABLE OF CONTENTS
1. PIN DESCRIPTIONS ............................................................................................................................... 4
2. CHARACTERISTICS AND SPECIFICATIONS....................................................................................... 5
SPECIFIED OPERATING CONDITIONS .................................................................................................... 5
ABSOLUTE MAXIMUM RATINGS............................................................................................................... 5
ANALOG CHARACTERISTICS (CS5381-KSZ/-KZZ).................................................................................. 6
DIGITAL FILTER CHARACTERISTICS........ ... ....................................... ... ... .... ... ... ... .... ... ........................... 7
SWITCHING CHARACTERISTICS - SERIAL AUDIO PORT .................................................................... 10
DC ELECTRICAL CHARACTERISTICS.................................................................................................... 13
DIGITAL CHARACTERISTICS ............................................................................ ... ... .... ... ... ... ... .... ............ 13
THERMAL CHARACTERISTICS .............................................................................................................. 13
TYPICAL CONNECTION DIAGRAM ......................................................................................................... 14
3. APPLICATIONS ............. ... .... ... ... ....................................... ... ... .... ... ...................................................... 15
3.1 Operational Mode/Sample Rate Range Select.............................................................................. 15
3.2 System Clocking............................................................................................................................ 15
3.2.1 Master Mode........................................................................................................................ 15
3.2.2 Slave Mode.......................................................................................................................... 16
3.3 Power-Up Sequence ..................................................................................................................... 16
3.4 Analog Connections ...................................................................................................................... 16
3.5 High-Pass Filter and DC Offset Calibration.................................................................................. 17
3.6 Overflow Detection ........................................................................................................................ 18
3.6.1 OVFL Configuration ............................................................................................................. 18
3.6.2 OVFL Output Timing ............................................................................................................ 18
3.7 Grounding and Power Supply Decoupling..................................................................................... 18
3.8 Synchronization of Multiple Devices.............................................................................................. 18
3.9 Capacitor Size on the Reference Pin (FILT+)................................................................................19
4. PACKAGE DIMENSIONS ........ ... ... .... ... ... ... ... ....................................... ... .... ... ... ... .... ... ... ...................... 20
5. ORDERING INFORMATION .............................................. ....................................... ... ... ... ... .... ............ 22
7. REVISION HISTORY....................................................................... ... ... ... ............................................. 24
CS5381
2 DS563F2
LIST OF FIGURES
Figure 1. Single-Speed Mode Stopband Rejection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Figure 2. Single-Speed Mode Transition Band. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Figure 3. Single-Speed Mode Transition Band (Detail). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Figure 4. Single-Speed Mode Passband Ripple . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Figure 5. Double-Speed Mode Stopband Rejection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Figure 6. Double-Speed Mode Transition Band . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Figure 7. Double-Speed Mode Transition Band (Detail). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Figure 8. Double-Speed Mode Passband Ripple . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Figure 9. Quad-Speed Mode Stopband Rejection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Figure 10. Quad-Speed Mode Transition Band . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Figure 11. Quad-Speed Mode Transition Band (Detail) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Figure 12. Quad-Speed Mode Passband Ripple . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Figure 13. Master Mode, Left-Justified SAI. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Figure 14. Slave Mode, Left-Justified SAI. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Figure 15. Master Mode, I²S SAI. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Figure 16. Slave Mode, I²S SAI. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Figure 17. OVFL Output Timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Figure 18. Left-Justified Serial Audio Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Figure 19. I²S Serial Audio Interface. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Figure 20. OVFL Output Timing, I²S Format. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Figure 21. OVFL Output Timing, Left-Justified Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Figure 22. Typical Connection Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Figure 23. CS5381 Master Mode Clocking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Figure 24. Recommended Analog Input Buffer. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Figure 25. CS5381 THD + N versus Frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
CS5381
LIST OF TABLES
Table 1. CS5381 Mode Control. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Table 2. CS5381 Common Master Clock Frequencies. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Table 3. CS5381 Slave Mode Clock Ratios . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
DS563F2 3
1. PIN DESCRIPTIONS
Pin Name # Pin Description
RST
M/S
LRCK
SCLK
MCLK
VD
GND
VL
SDOUT
MDIV
HPF
I²S/LJ
M0
M1
OVFL
AINL+
AINL-
VA
AINR-
AINR+
VQ
REF_GND
FILT+
13,14
16, 17
20, 21
1
2
3
4
5
6
7,18
8
9
10
11
12
15
19
22
23
24
Reset (Input) - The device enters a low power mode when low.
Master/Slave Mode (Input) - Selects operation as either clock master or slave.
Left Right Clock (Input/Output) - Determines which channel, Left or Right, is currently active on th e
serial audio data line.
Serial Clock (Input/Output) - Serial clock for the serial audio interface.
Master Clock (Input) - Clock source for the delta-sigma modulator and digital filters.
Digital Power (Input) - Positive power supply for the digital section.
Ground (Input) - Ground reference. Must be connected to analog ground.
Logic Power (Input) - Positive power for the digital input/output.
Serial Audio Data Output (Output) - Output for two’s complement serial audio data.
MCLK Divider (Input) - Enables a master clock divide by two function.
High-Pass Filter Enable (Input) - Enables the Digital High-Pass Filter.
Serial Audio Interface Format Select (Input) -Selects either the left-justified or I²S format for the SAI.
Mode Selection (Input) - Determines the operational mode of the device.
Overflow (Output, open drain) - Detects an overflow condition on both left and right channels.
Differential Left Channel Analog Inpu t (Input) - Signals are presented differentially to the delta-sigma
modulators via the AINL+/- pins.
Analog Power (Input) - Positive power supply for the analog section.
Differential Right Channel Analog Input (Input) -Signals are presented differentially to the delta-
sigma modulators via the AINR+/- pins.
Quiescent Voltage (Output) - Filter connection for the internal quiescent reference voltage.
Reference Ground (Input) - Ground reference for the internal sampling circuits.
Positive Voltage Reference (Output) - Positive reference voltage for the internal sampling circuits.
CS5381
RST 124FILT+
M/S 223REFGND
LRCK 322VQ
SCLK 421AINR+
MCLK 520AINR-
VD 619VA
GND 718GND
VL 817AINL-
SDOUT 916AINL+
MDIV 10 15 OVFL
HPF 11 14 M1
I²S/LJ 12 13 M0
4 DS563F2
CS5381
2. CHARACTERISTICS AND SPECIFICATIONS
All Min/Max characteristics and specifications are guaranteed over the Specified Operating Conditions. T ypical performance characteristics and specifications are derived from measurements taken at VA = 5.0 V, VD = VL = 3.3 V,
and TA = 25
°C.
SPECIFIED OPERATING CONDITIONS
(GND = 0 V; all voltages with respect to 0 V.)
Parameters Symbol Min Typ Max Units
DC Power Supply
DC Power Supplies: Positive Analog
Positive Digital
Positive Logic
Ambient Operating Temperature (Power Applied)
VA
VD
VL
T
4.75
3.1
2.37
A
-10 - +70 °C
5.0
-
-
5.25
5.25
5.25
V
V
V
ABSOLUTE MAXIMUM RATINGS
(GND = 0 V, All voltages with respect to ground.) (Note 1)
Parameter Symbol Min Typ Max Units
DC Power Supplies: Analog
Logic
Digital
Input Current (Note 2)
Analog Input Voltage (Note 3)
Digital Input Voltage (Note 3)
Ambient Operating Temperature (Power Applied)
Storage Temperature
V
T
VA
VL
VD
I
in
V
IND
T
stg
-0.3
-0.3
-0.3
-
-
-
+6.0
+6.0
+6.0
V
V
V
-10 - +10 mA
IN
GND-0.7 - VA+0.7 V
-0.7 - VL+0.7 V
A
-50 - +95 °C
-65 - +150 °C
Notes:
1. Operation beyond these limits may result in permanent damage to the device. Normal operation is not
guaranteed at these extremes.
2. Any pin except supplies. Transient currents of up to ±100 mA on the analog input pins will not cause
SRC latch-up.
3. The maximum over/under voltage is limited by the input current.
DS563F2 5
CS5381
ANALOG CHARACTERISTICS (CS5381-KSZ/-KZZ)
Test conditions (unless otherwise specified): Input test signal is a 1 kHz sine wave; measurement bandwidth is
10 Hz to 20 kHz.
Parameter Symbol Min Typ Max Unit
Single-Speed Mode Fs = 48 kHz
Dynamic Range A-weighted
unweighted
Total Harmonic Distortion + Noise (Note 4)
-1 dB
-20 dB
-60 dB
Double-Speed Mode Fs = 96 kHz
Dynamic Range A-weighted
unweighted
40 kHz bandwidth unwei ghted
Total Harmonic Distortion + Noise (Note 4)
-1 dB
-20 dB
-60 dB
40 kHz bandwidth -1 dB
Quad-Speed Mode Fs = 192 kHz
Dynamic Range A-weighted
unweighted
40 kHz bandwidth unwei ghted
Total Harmonic Distortion + Noise (Note 4)
-1 dB
-20 dB
-60 dB
40 kHz bandwidth -1 dB
Dynamic Performance for All Modes
Interchannel Isolation
DC Accuracy
Interchannel Gain Mismatch
Gain Error
Gain Drift
Offset Error HPF enabled
HPF disabled
Analog Input Characteristics
Full-scale Input Voltage
Input Impedance (Differential) (Note 5)
Common Mode Rejection Ratio
THD+N
THD+N
THD+N
CMRR - 100 - dB
114
111
-
-
-
114
111
-
-
-
-
-
114
111
-
-
-
-
-
120
117
-110
-97
-57
120
117
114
-110
-97
-57
-107
120
117
114
-110
-97
-57
-107
-
-
-104
-
-
-
-
-
-104
-
-
-
-
-
-
-104
-
-
-
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
-110-dB
-0.1-dB
-5 - 5 %
- ±100 - ppm/°C
-
-
0
100
-
-
LSB
LSB
1.07*VA 1.13*VA 1.18*VA Vpp
-2.5-kΩ
4. Referred to the typical full-scale input voltage.
5. Measured between AIN+ and AIN-.
6 DS563F2
DIGITAL FILTER CHARACTERISTICS
Parameter Symbol Min Typ Max Unit
Single-Speed Mode (2 kHz to 54 kHz sample rates)
Passband (-0.1 dB) (Note 6)
Passband Ripple
Stopband (Note 6)
Stopband Attenuation
Total Group Delay (Fs = Output Sample Rate)
Double-Speed Mode (50 kHz to 108 kHz sample rates)
Passband (-0.1 dB) (Note 6)
Passband Ripple
Stopband (Note 6)
Stopband Attenuation
Total Group Delay (Fs = Output Sample Rate)
Quad-Speed Mode (100 kHz to 216 kHz sample rates)
Passband (-0.1 dB) (Note 6)
Passband Ripple
Stopband (Note 6)
Stopband Attenuation
Total Group Delay (Fs = Output Sample Rate)
High-Pass Filter Characteristics
Frequency Response -3.0 dB
-0.13 dB (Note 7)
Phase Deviation @ 20 Hz (Note 7)
Passband Ripple
Filter Setting Time
CS5381
0 - 0.47 Fs
-0.1 - 0.035 dB
0.58 - - Fs
-95 - - dB
t
gd
t
gd
t
gd
-12/Fs- s
0 - 0.45 Fs
-0.1 - 0.035 dB
0.68 - - Fs
-92 - - dB
-9/Fs- s
0 - 0.24 Fs
-0.1 - 0.035 dB
0.78 - - Fs
-97 - - dB
-5/Fs- s
-120-
-
Hz
Hz
-10-Deg
--0dB
105/Fs s
6. The filter frequency response scales precisely with Fs.
7. Response shown is for Fs equal to 48 kHz. Filter characteristics scale with Fs.
DS563F2 7
CS5381
0
-10
-20
-30
-40
-50
-60
-70
-80
Amplitude (dB)
-90
-100
-110
-120
-130
-140
0.00.10.20.30.40.50.60.70.80.91.0
Frequency (normalized to Fs)
0
-10
-20
-30
-40
-50
-60
-70
-80
Amplitude (dB)
-90
-100
-110
-120
-130
-140
0.40 0.42 0.44 0.46 0.48 0.50 0.52 0.54 0.56 0.58 0.60
Frequency (normalized to Fs)
Figure 1. Single-Speed Mode Stopband Rejection Figure 2. Single-Speed Mode Transition Band
0
-1
-2
-3
-4
-5
Amplitude (dB)
-6
-7
-8
-9
-10
0.45 0.46 0.47 0.48 0.49 0.50 0.51 0.52 0.53 0.54 0.55
Frequency (normalized to Fs)
0.10
0.08
0.05
0.03
0.00
Amplitude (dB)
-0.03
-0.05
-0.08
-0.10
0.00 0.05 0.10 0.15 0.20 0.25 0.30 0.35 0 .40 0.45 0.50
Frequency (normalized to Fs)
Figure 3. Single-Speed Mode Transition Band (Detail) Figure 4. Single-Speed Mode Passband Ripple
0
-10
-20
-30
-40
-50
-60
-70
-80
Amplitude (dB)
-90
-100
-110
-120
-130
-140
0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
Frequency (normalized to Fs)
0
-10
-20
-30
-40
-50
-60
-70
-80
Amplitude (dB)
-90
-100
-110
-120
-130
-140
0.40 0.43 0.45 0.48 0.50 0.53 0.55 0.58 0.60 0.63 0.65 0.68 0.70
Frequency (normalized to Fs)
Figure 5. Double-Speed Mode Stopband Rejection Figure 6. Double-Speed Mode Transition Band
8 DS563F2
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