CDB5571
100 kSps, 16-bit, High-throughput ΔΣ ADC
Evaluation Board
Features
General Description
Analog Input Channels to the CS5571 ADC
Pre-configured to require a minimum number of external
connections to your data acquisition system.
All functionality accessible through the connector interface
and board-level options.
On-board 4.096 V Reference
Pre-configured for Master mode SPI™ communication to a
data capture system.
The CDB5571 is a versatile tool designed for evaluating the functionality and performance of the CS5571 ADC (Analog-to-Digital
Converter). The SPI serial port on the CDB5571 evaluation board
is configured in Master mode and will start transmitting data after
power-up upon reset. This evaluation board is designed to connect
to your data capture system or will interface to the CapturePlus II
data acquisition system available from Cirrus Logic.
The CS5571 delta-sigma ADC produces fully settled conversions to
full specified accuracy at 100 kSps. This ability to produce fully settled conversions for every sample makes it suitable for converting
multiplexed input signals. To help evaluate this feature, the
CDB5571 includes two single-ended analog inputs multiplexed into
the CS5571. The multiplexer can be switched at the CS5571 ADC
sample speed and the ADC will produce fully settled conversion data
for each input channel.
All evaluation board functionality for evaluating the CS5571 ADC is
accessed through the connector interface and board-level options.
Schematics in PADS™ PowerLogic™ format are available for
download at:
http://www.cirrus.com/en/products/pro/detail/P1120.html.
ORDERING INFORMATION
CDB5571
www.cirrus.com
Copyright Cirrus Logic, Inc. 2009
(All Rights Reserved)
Evaluation Board
OCT ‘09
DS768DB4
CDB5571
TABLE OF CONTENTS
1. INTRODUCTION ....................................................................................................................... 3
1.1 Overview ............................................................................................................................ 4
2. QUICK START .......................................................................................................................... 5
3. HARDWARE DESCRIPTION ................................................................................................... 6
3.1 Absolute Maximum Ratings ............................................................................................... 6
3.2 Power Supply ..................................................................................................................... 6
3.3 Analog Section ................................................................................................................... 6
3.3.1 Analog Input Buffers .............................................................................................. 6
3.3.2 Multiplexer ............................................................................................................. 7
3.3.3 ADC Reset ............................................................................................................ 7
3.3.4 Voltage Reference ................................................................................................ 7
3.3.5 ADC Reference Frequency ................................................................................... 7
3.4 Digital Section .................................................................................................................... 8
3.4.1 Hardware Configuration ........................................................................................ 8
3.4.2 SPI™ Serial Port Communications ....................................................................... 8
APPENDIX A. MAXIMIZING THE PERFORMANCE OF THE CS5571 ........................................ 9
A.1 PCB Layout Considerations .............................................................................................. 9
A.2 Hardware Considerations .................................................................................................. 9
APPENDIX B. BILL OF MATERIALS ........................................................................................ 10
APPENDIX C. SCHEMATICS ..................................................................................................... 11
APPENDIX D. LAYER PLOTS ................................................................................................... 16
APPENDIX E. CALIBRATION FUNCTION ................................................................................. 25
APPENDIX E. REVISION HISTORY .......................................................................................... 26
LIST OF FIGURES
Figure 1. CDB5571 Block Diagram ................................................................................................. 4
Figure 2. CDB5571 Board Layout ................................................................................................... 5
Figure 3. Schematic - Block Diagram............................................................................................ 11
Figure 4. Schematic - Power Supplies .......................................................................................... 12
Figure 5. Schematic - Input Buffers and Multiplexer ..................................................................... 13
Figure 6. Schematic - CS5571 ...................................................................................................... 14
Figure 7. Schematic - Configuration & Misc. ................................................................................. 15
Figure 8. Top Silkscreen ............................................................................................................... 16
Figure 9. Top Solder Mask ............................................................................................................ 17
Figure 10. Top Routing.................................................................................................................. 18
Figure 11. Ground Plane ............................................................................................................... 19
Figure 12. Power Plane................................................................................................................. 20
Figure 13. Bottom Solder Mask..................................................................................................... 21
Figure 14. Bottom Silkscreen ........................................................................................................ 22
Figure 15. Top Solder Paste Mask................................................................................................ 23
Figure 16. Bottom Routing ............................................................................................................ 24
LIST OF TABLES
Table 1. Power Supply Connections ............................................................................................... 6
Table 2. Analog Input Connections ................................................................................................. 6
Table 3. Analog Input Channel Selection ........................................................................................ 7
Table 4. Hardware Configuration Signals........................................................................................ 8
Table 5. Serial Interface Connections ............................................................................................. 8
2
DS768DB4
CDB5571
1. INTRODUCTION
The CDB5571 evaluation board is a platform for evaluating the CS5571 ADC performance. The evaluation board is designed to connect to the SPI serial port of a processor or data capture system or will interface directly to the CapturePlus II data acquisition system available from Cirrus Logic. The CapturePlus II
data acquisition system is a powerful integrated hardware/software tool designed to fully exercise the
CDB5571 and other Cirrus Logic evaluation boards.
The CDB5571 evaluation board is designed to simplify the hardware setup required to evaluate the
CS5571. Interfacing the CDB5571 evaluation board to a user-supplied data capture system can be as
simple as connecting the SPI port and using the CDB5571 default hardware configuration. In this configuration, simply press the Reset switch on the CDB5571 and it will automatically begin transmitting data to
the data capture system.
All evaluation board functionality for evaluating the CS5571 ADC is accessed through the connector interface and board-level options.
The CS5571 delta-sigma ADC produces fully settled conversions to full specified accuracy at 100 kSps.
The ability to produce fully settled conversions for every sample makes it suitable for converting multiplexed input signals. To help evaluate this feature, the CDB5571 includes two single-ended analog inputs
multiplexed into the CS5571. The multiplexer can be switched at the CS5571 ADC sample speed and
the ADC will produce fully settled conversion data for each input channel.
For detailed information on the CS5571 ADC, please reference data sheet DS768 at www.cirrus.com.
DS768DB4
3
CDB5571
1.1
Overview
The CDB5571 evaluation board has both analog and digital circuit sections. The analog section consists
of the CS5571 ADC, two analog input signal buffers, controlled through a multiplexer, that condition the
signals into the ADC, and a precision 4.096 V reference. The digital section consists of board operation
configuration control signals, reset circuitry, an SPI™ serial port, a jumper connection for initiating ADC
calibration, and an EEPROM for evaluation board identification.
The evaluation board operates from +2.5V, -2.5V, +3.3V and communicates through an SPI™ serial port.
Figure 1 illustrates the CDB5571 block diagram.
VREF
4.096 V
Single-ended
Analog Inputs
IN_A
IN_B
J8
Master/Slave
Serial Port
J6
Digital Inputs
to ADC
J7
Digital Outputs
from ADC
CS3004
M
U
X
CS5571
XTAL
16 MHz
Communication/Control
Interface
+2.5V GND -2.5V GND +3.3V GND
Figure 1. CDB5571 Block Diagram
4
DS768DB4
CDB5571
2. QUICK START
Buffer Enable
DC Supply
Calibrate 2
ADC Reset
Signals to ADC & Mux
4.096 V Reference
Master/Slave SPI
ADC MCLK Out
Analog Inputs
NOTES:
1. Shaded boxes marked with "OPT. CONFIG." are not necessary for operation in an end user product.
2. Calibration function has been removed from the device but still appears on the PCB. J2 must be shorted (grounded)
for proper operation. See Appendix E for details.
Figure 2. CDB5571 Board Layout
The CDB5571 evaluation board is designed to interface with a data acquisition system. To connect and
configure the CDB5571 perform the following initialization procedure:
1. Verify that the power supplies are off.
2. Connect the power supplies to the CDB5571 as shown in Table 1 on page 6.
3. Verify that the power is off to the analog input signal & control signal sources.
4. Connect the analog input signal source to the evaluation board per Table 2 on page 6. Verify from Table 4
on page 8 that the analog input channel selected is IN_A.
5. Configure the CDB5571 by connecting the control signal sources to the evaluation board as shown in
Table 3 on page 7. Apply logic-level inputs as required to override the resistor pull-ups/pull-downs.
6. Make connections to the SPI™ serial port connector as shown in Table 5 on page 8. The CS5571 ADC
serial port is configured by default to operate in the SSC (Synchronous Self Clocking) mode. Refer to the
CS5571 data sheet for more information on serial communication modes and signal timing.
7. Turn on the power supplies to the evaluation board.
8. Apply power to the signal source.
9. Press the Reset switch on the evaluation board.
10. The CS5571 ADC's SPI™ serial port should now be communicating data.
DS768DB4
5
CDB5571
3. HARDWARE DESCRIPTION
3.1
Absolute Maximum Ratings
Observe the following limits to ensure the CDB5571 component ratings are not exceeded.
• CS5571
– The absolute maximum supply voltage that can be applied to the +3.3V power supply
connection is +3.6V.
– The absolute maximum power supply voltage that can be applied between pins VL and V1is 6.1 V.
• CS3004
– The absolute maximum power supply voltage that can be applied between the +2.5V and
-2.5V power supply connections is +5.5V.
3.2
Power Supply
Power supply connections and requirements are specified in Table 1. below.
Table 1. Power Supply Connections
Power Supply
Requirement
Power Supply
Connection
Associated
Ground Return
Associated
Test Points
+2.5 V DC, ±5%, <50 mA
E5
E3
TP2, TP1 (GND)
-2.5 V DC, ±5%, <50 mA
E9
E7
TP4, TP3 (GND)
+3.3 V DC, ±5%, <50 mA
E16
E13
TP6, TP5 (GND)
Important: It is recommended that all power supplies be isolated from utility ground to prevent the introduction of a ground loop. One ground connection may already exist through the serial port connection to
utility ground. Using the Cirrus Logic CapturePlus II system simplifies making connections to the
CDB5571 by providing electrical isolation between the two.
Using twisted/shielded wire will reduce electrical noise induced onto the power supply cables.
Power supplies are to be adequately regulated and sufficiently low noise to meet the application requirements.
3.3
3.3.1
Analog Section
Analog Input Buffers
The analog input signal connections to the input buffers are made at the IN_A and IN_B connectors, as
specified in Table 2.
Table 2. Analog Input Connections
Channel
Analog Input
Connection
Input Signal
Voltage Range
Impedance
IN_A
J10
-2.048 V to +2.048 V
50 Ohms
IN_B
J11
-2.048 V to +2.048 V
50 Ohms
There are two analog input channels on the evaluation board. Each analog input channel consists of a
low-noise amplifier configured as a unity gain non-inverting buffer. The buffers utilize a Cirrus Logic
CS3004 precision, low-noise, low-voltage, dual opamp.. These op-amps enable both the inputs and outputs of the analog input buffer to operate virtually rail to rail. The channel input impedance is 50 Ohms.
6
DS768DB4
CDB5571
The analog inputs are designed for connections to single-ended input signals referenced to ground. The
usable input voltage range is -2.048 V to +2.048 V. The theoretical input frequency range of the CS5571
is from DC to the Nyquist frequency of 50 kHz. The analog input buffer amplifiers are configured for a cutoff frequency of 16.8 kHz to band-limit noise into the ADC. Changing the cutoff frequency will change the
noise bandwidth accordingly.
3.3.2
Multiplexer
Analog input channel selection is controlled through the multiplexer. The multiplexer is configured with a
pull-down resistor on the MUX control line to enable input channel labeled "INPUT A" by default. To select
channel B, apply 3.3 V to the multiplexer input control line (MUX).
Signal levels for controlling the multiplexer that selects between analog input channels A and B is shown
in Table 3.
Table 3. Analog Input Channel Selection
Multiplexer
Control Input (MUX)
Input Channel
Enabled
0V
A
3.3 V
B
During multiplexing, the maximum sample rate for each channel is half that of the ADC’s maximum sample rate. Additionally, the Nyquist frequency for each channel is half of the ADC’s Nyquist frequency.
3.3.3
ADC Reset
The CS5571 ADC makes use of an externally generated power-on reset. Therefore, after power is applied to the ADC, the reset pin must be driven low then released. Pressing the Reset button generates a
reset cycle. A reset cycle can be generated at any time during ADC operation. The ADC RST pin (active
low) is held inactive through a pull-up resistor.
3.3.4
Voltage Reference
The voltage reference IC provided generates a 4.096 V precision reference.
3.3.5
ADC Reference Frequency
The reference frequency for the CS5571 ADC is provided by a 16.000 MHz oscillator.
DS768DB4
7
CDB5571
3.4
Digital Section
3.4.1
Hardware Configuration
The CDB5571 evaluation board hardware comes pre-configured so the only connection required between
it and a data acquisition system is the serial port connection.
The hardware setup is reconfigurable through the hardware control interface connectors. Configure the
evaluation board by setting the appropriate control line to the appropriate logic level.
Table 4. Hardware Configuration Signals
Function
Default Level
Label
Connector
Test Point
Input Channel Select
IN_A = Selected (Low)
MUX
J6, Pin 16
J3, Pin 2
Analog Input Buffers
Buffers = Enabled (High)
BUFEN
J1
J3, Pin1
Serial Port Mode
Sync. Self Clock = Enabled (High)
SMODE
J6, Pin 12
J3, Pin 3
Data Ready Flag
Data Ready When Set (Low)
RDY
J8, Pin 10
J3, Pin 4
Reset
Reset = Inactive (High)
RST
J6, Pin 6; S1
J3, Pin 6
Bipolar / Unipolar Mode
Bipolar = Enabled (High)
BP / UP
J6, Pin 2
J3, Pin 8
Digital Filter Dither
Dither = Enabled (High)
DITHER
J6, Pin 4
J3, Pin 9
Serial Port Communication
Chip Select = Enabled (Low)
CS
J8, Pin 2
E23
Data Conversion Mode
Continuous Conversion = Active (Low)
CONV
J8, Pin 12
E21
3.4.2
SPI™ Serial Port Communications
The CS5571 ADC communications port features an SPI™ serial port. It can be configured for SSC mode
(Master) or SEC mode (Slave) mode as shown in Table 4. Test points are provided to monitor serial communications.
Connections to the serial interface are made according to the following table.
Table 5. Serial Interface Connections
8
Function
Label
Connector
Test Point
Chip Select
CS
J8, Pin 2
E23
Serial Data Input
SDI
J8, Pin 4
E24
Serial Data Output
SDO
J8, Pin 6
E25
Serial Clock
SCLK
J8, Pin 8
E26
DS768DB4
CDB5571
APPENDIX A. MAXIMIZING THE PERFORMANCE OF THE CS5571
A.1
PCB Layout Considerations
• Keep the signal path short between the CS5571 ADC input capacitors C37, C44 and the ADC
input pin to minimize trace inductance.
• The analog input buffer amplifiers and ADC input buffer capacitors are placed before the multiplexer. Placing the buffer amplifiers before the multiplexer allows the amplifiers driving the ADC
buffer capacitors to be fully settled when sampled by the ADC. Therefore, the multiplexer must
be of a low on-resistance type to prevent distortion or latency issues.
• Power supply noise is a major design consideration and the power supplies need adequate
bypassing and bulk capacitance.
• When operating the ADC from +2.5 V and -2.5 V split supplies, place the power supply & buffer
amplifier bypass capacitor ground connections close together.
• Keep all ground connections on each differential buffer amplifier as close to the device as possible to avoid introducing differential noise through high-impedance connections.
• Keep trace lengths short between the ADC and the voltage reference IC negative supply pins.
• Route the oscillator output away from analog circuitry.
• Use a solid ground plane in the PCB layout.
• Provide adequate separation between analog and digital signals.
• To minimize distortion within the analog signal path, consider using components with smaller
voltage dependencies.
• Minimize ADC digital output edge transition current loading.
A.2
Hardware Considerations
At a system level, use shielded cable for interconnects. Keep interconnect cable lengths as short as possible. Route analog and digital signals connecting to the PCB away from each other.
DS768DB4
9
10
110-00045-Z1
110-00024-Z1
110-00025-Z1
060-00351-Z1
065-00238-Z3
060-00352-Z1
065-00219-Z1
060-00386-Z1
062-00064-Z1 A
102-00097-Z1 A
603-00284-Z1
240-00284-Z1
600-00284-Z1
300-00002-Z1
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
021-00435-Z1
021-00363-Z1
020-02044-Z1
021-00387-Z1
020-02273-Z1
021-00423-Z1
020-01848-Z1
023-00002-Z1
020-01816-Z1
020-01667-Z1
021-01430-Z1
120-00057-Z1
15
16
17
18
19
20
21
22
23
24
25
26
001-06472-Z1 A
115-00052-Z1 A
A
A
A4
A
A
A
A
A
B0
A
A0
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
A
115-00052-Z1
115-00217-Z1
115-00239-Z1
115-00238-Z1
115-00241-Z1
304-00012-Z1
9
10
11
12
13
14
A
A
A
A
A
A
012-00012-Z1
001-03987-Z1
001-05587-Z1
070-00111-Z1
070-00010-Z1
000-00025-Z1
3
4
5
6
7
8
CAP 4700pF ±5% 50V C0G NPb 1206
HDR 2x1 ML .1"CTR 093 GLD NPb
ASSY DWG CDB5571-1-Z NPb
PCB CDB5571-1-Z NPb
SCHEM CDB5571-Z NPb
SCREW 4-40X1/4" PH NYLON NPb
IC PGM SPI EEPROM 8kX8 2MHz NPb SO8
OSC 16MHz 50ppm 3.3V NPb SMD 3x5
CON TEST PT .1"CTR TIN PLAT NPb BLK
CON TEST PT .1" TIN PLT RED NPb TH
CON TEST PT .1" TIN PLATE WHT NPb
IC LNR PREC VREF 4.096Vout NPb SO8
IC CRUS ADC 100kSps 16b NPb SSOP24
IC LNR ANA SW 4OHM SPDT NPb MSOP10
IC CRUS PREC DL LO-V AMP NPb SOIC8
IC LNR DIFF COMP HS 5.25V NPb SOIC8
RES 10k OHM 1/8W ±5% NPb 0805 FILM
RES 10 OHM 1/8W ±5% NPb 0805 FILM
RES 100k OHM 1/8W ±1% NPb 0805 FILM
RES 100 OHM 1/8W ±5% NPb 0805 FILM
RES 0 OHM 1/4W 1206 FILM
RES 3.3k OHM 1/8W ±5% NPb 0805 FIL
RES 2k OHM 1/8W ±1% NPb 0805 FILM
RES 49.9 OHM 1/10W ±5% NPb 0805 THN
RES 1k OHM 1/8W ±1% NPb 0805 FILM
RES 49.9 OHM 1/8W ±1% NPb 0805 FILM
RES 33k OHM 1/8W ±5% NPb 0805 FILM
SWT SPST 130G 0/1 7mm TACT ESD NPb
HDR 2x1 ML .1"CTR 093 GLD NPb
HDR 10X1 FML .1" 093 GLD NPb TH
HDR 8X2 093BD FML .1" .331" NPb TH
HDR 5X2 093BD FML .1" .331" NPb TH
HDR 6X2 093BD FML .1" .331" NPb TH
SPCR STANDOFF NYL HEX750/4-40TH NPb
CAP 10uF ±20% 16V ELEC NPb CASE A
CAP 4700pF ±10% 50V X7R NPb 0805
CAP 120pF ±5% 100V C0G NPb 1206
DIODE TR 6.8V 600W NPb DO-214AA
DIODE SCHTKY BAR 30V 0.2A NPb SOT23
NO POP 040 PAD 064 NPb TH
Item Cirrus P/N
Rev Description
1
001-03713-Z1 A
CAP 1000pF ±10% 50V X7R NPb 0805
2
001-04345-Z1 A
CAP 0.1uF ±10% 50V X7R NPb 0805
CIRRUS LOGIC
CDB5571_REV_A4.PL
U7
Y1
TP1 TP3 TP5
TP2 TP6
TP4
U1
U3
U4
U5
U6
R1 R2 R7 R8 R31 R32 R39 R40 R42
R3 R21 R22 R25
R4 R5 R6 R10 R30
R13
R14 R23 R38
R17
R33 R34 R45 R46
R35 R44
R36 R43
R37 R47
R41
S1
2
2
C37 C44
J10 J11
REF
1
REF
4
XMH1 XMH2 XMH3 XMH4
1
1
3
2
1
1
1
1
1
1
9
4
5
1
3
1
4
2
2
2
1
1
Qty Reference Designator
2
C1 C2
27 C3 C4 C5 C9 C10 C12 C15 C16 C17 C18 C19
C21 C22 C23 C27 C29 C30 C32 C33 C35 C36
C38 C40 C41 C42 C43 C46
3
C6 C7 C13
1
C8
2
C34 C45
3
D1 D2 D3
1
D4
0
E1 E2 E3 E4 E5 E6 E7 E9 E10 E11 E13 E14 E15
E16 E17 E18 E19 E20 E21 E22 E23 E24 E25
E26 E27 E28
0
J1 J2
0
J3
1
J6
1
J7
1
J8
4
MH1 MH2 MH3 MH4
BILL OF MATERIAL
KEMET
SAMTEC
CIRRUS LOGIC
CIRRUS LOGIC
CIRRUS LOGIC
BUILDING FASTENERS
MICROCHIP
ABRACON
KEYSTONE
KEYSTONE
KEYSTONE
MAXIM
CIRRUS LOGIC
MAXIM
CIRRUS LOGIC
TEXAS INSTRUMENTS
DALE
DALE
DALE
DALE
DALE
DALE
DALE
SUSUMU
DALE
DALE
DALE
ITT INDUSTRIES
SAMTEC
SAMTEC
SAMTEC
SAMTEC
SAMTEC
KEYSTONE
PANASONIC
KEMET
KEMET
LITTELFUSE
PHILIPS
NO POP
MFG
KEMET
KEMET
C1206C472J5GAC
TSW-102-26-G-S
603-00284-Z1
240-00284-Z1
600-00284-Z1
NY PMS 440 0025 PH
25LC640-I/SN
ASFL1-16.000MHZ-EC-T
5001
5000
5002
MAX6126AASA41+
CS5571-ISZ/B0
MAX4635EUB+
CS3004-FSZ/A0
TL712CD
CRCW080510K0JNEA
CRCW080510R0JNEA
CRCW0805100KFKEA
CRCW0805100RJNEA
CRCW12060000Z0EA
CRCW08053K300JNEA
CRCW08052K00FKEA
RR1220Q-49R9-D-M
CRCW08051K00FKEA
CRCW080549R9FKEA
CRCW080533K0JNEA
PTS645TL70
TSW-102-26-G-S
SSW-110-01-G-S
SSW-108-01-G-D
SSW-105-01-G-D
SSW-106-01-G-D
1902D
EEE1CS100SR
C0805C472K5RAC
C1206C121J1GAC
P6SMBJ6.8A
BAT54
NP-PAD-040
MFG P/N
C0805C102K5RAC
C0805C104K5RAC
ECO521, ECO542
ECO521, ECO542
INSTALL AFTER WASH PROCESS
REQUIRES SCREW 4-40X1X4" PH
NYLON, 300-00002-Z1
NO POP
NO POP
NO POP
Notes
CDB5571
APPENDIX B. BILL OF MATERIALS
DS768DB4
CDB5571
Figure 3. Schematic - Block Diagram
APPENDIX C. SCHEMATICS
DS768DB4
11
Figure 4. Schematic - Power Supplies
CDB5571
12
DS768DB4
Figure 5. Schematic - Input Buffers and Multiplexer
CDB5571
DS768DB4
13
Figure 6. Schematic - CS5571
CDB5571
14
DS768DB4
Figure 7. Schematic - Configuration & Misc.
CDB5571
DS768DB4
15
16
Figure 8. Top Silkscreen
Calibration function has been removed from the device but still appears on the PCB. J2 must be shorted (grounded)
for proper operation. See Appendix E for details.
CDB5571
APPENDIX D. LAYER PLOTS
DS768DB4
Figure 9. Top Solder Mask
CDB5571
DS768DB4
17
Figure 10. Top Routing
CDB5571
18
DS768DB4
Figure 11. Ground Plane
CDB5571
DS768DB4
19
Figure 12. Power Plane
CDB5571
20
DS768DB4
Figure 13. Bottom Solder Mask
CDB5571
DS768DB4
21
Figure 14. Bottom Silkscreen
CDB5571
22
DS768DB4
Figure 15. Top Solder Paste Mask
CDB5571
DS768DB4
23
Figure 16. Bottom Routing
CDB5571
24
DS768DB4
CDB5571
APPENDIX E. CALIBRATION FUNCTION
The calibration function has been removed from the CS5571. All references to calibration have been removed from this document. However, calibration still appears on the PCB. A jumper must be added to J2
for proper operation.
DS768DB4
25
CDB5571
REVISION HISTORY
Revision
Date
Changes
DB1
APR 2007
Initial Release.
DB2
AUG 2007
Added 3.3.2 Mutiplexer section.
DB3
DEC 2007
Updated schematic to reflect new silicon revision.
DB4
OCT 2009
Removed calibration function / added Appendix E.
Contacting Cirrus Logic Support
For all product questions and inquiries contact a Cirrus Logic Sales Representative. To find the one nearest to you
go to www.cirrus.com
IMPORTANT NOTICE
Cirrus Logic, Inc. and its subsidiaries ("Cirrus") believe that the information contained in this document is accurate and reliable. However, the information is subject
to change without notice and is provided "AS IS" without warranty of any kind (express or implied). Customers are advised to obtain the latest version of relevant
information to verify, before placing orders, that information being relied on is current and complete. All products are sold subject to the terms and conditions of sale
supplied at the time of order acknowledgment, including those pertaining to warranty, indemnification, and limitation of liability. No responsibility is assumed by Cirrus
for the use of this information, including use of this information as the basis for manufacture or sale of any items, or for infringement of patents or other rights of third
parties. This document is the property of Cirrus and by furnishing this information, Cirrus grants no license, express or implied under any patents, mask work rights,
copyrights, trademarks, trade secrets or other intellectual property rights. Cirrus owns the copyrights associated with the information contained herein and gives
consent for copies to be made of the information only for use within your organization with respect to Cirrus integrated circuits or other products of Cirrus. This consent does not extend to other copying such as copying for general distribution, advertising or promotional purposes, or for creating any work for resale.
CERTAIN APPLICATIONS USING SEMICONDUCTOR PRODUCTS MAY INVOLVE POTENTIAL RISKS OF DEATH, PERSONAL INJURY, OR SEVERE PROPERTY OR ENVIRONMENTAL DAMAGE ("CRITICAL APPLICATIONS"). CIRRUS PRODUCTS ARE NOT DESIGNED, AUTHORIZED OR WARRANTED FOR
USE IN PRODUCTS SURGICALLY IMPLANTED INTO THE BODY, AUTOMOTIVE SAFETY OR SECURITY DEVICES, LIFE SUPPORT PRODUCTS OR OTHER
CRITICAL APPLICATIONS. INCLUSION OF CIRRUS PRODUCTS IN SUCH APPLICATIONS IS UNDERSTOOD TO BE FULLY AT THE CUSTOMER'S RISK
AND CIRRUS DISCLAIMS AND MAKES NO WARRANTY, EXPRESS, STATUTORY OR IMPLIED, INCLUDING THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR PARTICULAR PURPOSE, WITH REGARD TO ANY CIRRUS PRODUCT THAT IS USED IN SUCH A MANNER. IF THE CUSTOMER
OR CUSTOMER'S CUSTOMER USES OR PERMITS THE USE OF CIRRUS PRODUCTS IN CRITICAL APPLICATIONS, CUSTOMER AGREES, BY SUCH USE,
TO FULLY INDEMNIFY CIRRUS, ITS OFFICERS, DIRECTORS, EMPLOYEES, DISTRIBUTORS AND OTHER AGENTS FROM ANY AND ALL LIABILITY, INCLUDING ATTORNEYS' FEES AND COSTS, THAT MAY RESULT FROM OR ARISE IN CONNECTION WITH THESE USES.
Cirrus Logic, Cirrus, and the Cirrus Logic logo designs are trademarks of Cirrus Logic, Inc. All other brand and product names in this document may be trademarks
or service marks of their respective owners.
SPI is a trademark of Motorola, Inc.
PADS and PowerLogic are trademarks of Mentor Graphics.
National Semiconductor is a registered trademark of National Semiconductor Corporation.
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