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CDB53L21
Evaluation Board for CS53L21
Features
Selectable Analog Inputs - Stereo Line-Level RCA Jacks - Stereo Microphone 1/8" Jacks Stereo Microphone Input Jacks 8- to 96-kHz S/PDIF Output - CS8406 Digital Audio Transmitter I/O Stake Headers - External Control Port Accessibility - External DSP Serial Audio I/O Accessibility
Description
The CDB53L21 evaluation board is an excellent means for evaluating the CS53L21 ADC. Evaluation requires an analog audio source, an analog/digital analyzer and power supplies. Optionally, a Windows PC-compatible computer may be used to evaluate the CS53L21 in Software Mode. System timing can be provided by the CS53L21 with supplied master clock, or by using an I/O stake header with a DSP connected. RCA phono jacks are provided for the CS53L21 analog inputs. 1/8" jacks are also available for microphone inputs. A digital data output is available from the CS8406 via RCA phono or optical connectors. The Windows software provides a GUI to make configuration of the CDB53L21 easy. The software communicates through the PC's serial port or USB port to configure the control port registers so that all features of the CS53L21 can be evaluated. The evaluation board may also be configured to accept external timing and data signals for operation in a user application during system development. ORDERING INFORMATION CDB53L21
Independent, Regulated Supplies 1.8 V to 3.3 V Logic Interface Hardware Control - 4 Pre-Defined Switch Settings FlexGUI S/W Control - Windows(R) Compatible - Pre-Defined & User-Configurable Scripts Layout and Grounding Recommendations
Evaluation Board
Software Mode Control Port
Reset
IC/SPI Header
MCLK
Reset
Hardware Mode Switches S/PDIF Output (CS8406) FPGA Analog Input (Line or MIC)
CS53L21
Reset MCLK Reset
Oscillator (socket)
Clocks/Data Header
http://www.cirrus.com
Copyright (c) Cirrus Logic, Inc. 2006 (All Rights Reserved)
MARCH '06 DS700DB1
CDB53L21
TABLE OF CONTENTS
1. SYSTEM OVERVIEW ............................................................................................................................. 4 1.1 Power ............................................................................................................................................... 4 1.2 Grounding and Power Supply Decoupling ........................................................................................ 4 1.3 FPGA ................................................................................................................................................ 4 1.4 CS53L21 Audio A to D Converter ..................................................................................................... 4 1.5 CS8406 Digital Audio Transmitter .................................................................................................... 5 1.6 Oscillator ........................................................................................................................................... 5 1.7 I/O Stake Headers ............................................................................................................................ 5 1.8 Analog Input ..................................................................................................................................... 5 1.9 Stand-Alone Switches ...................................................................................................................... 6 1.10 Control Port Connectors ................................................................................................................. 6 1.10.1 RS-232 and USB Connectors ............................................................................................... 6 2. SOFTWARE MODE CONTROL ............................................................................................................. 7 2.1 General Configuration Tab ............................................................................................................... 8 2.2 ADC Configuration Tab .................................................................................................................... 9 2.3 ADC Volume Controls Tab ............................................................................................................. 10 2.4 Mix Volume Controls Tab ............................................................................................................... 11 2.5 Register Maps Tab ......................................................................................................................... 12 3. HARDWARE MODE CONTROL .......................................................................................................... 13 3.1 FPGA H/W Control ......................................................................................................................... 13 3.2 CS53L21 H/W Control .................................................................................................................... 16 4. PERFORMANCE PLOTS ..................................................................................................................... 17 5. SYSTEM CONNECTIONS AND JUMPERS ........................................................................................ 20 6. BLOCK DIAGRAM ............................................................................................................................... 22 7. SCHEMATICS ...................................................................................................................................... 23 8. BOARD LAYOUT ................................................................................................................................. 30 9. REVISION HISTORY ............................................................................................................................ 33
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LIST OF FIGURES
Figure 1.General Configuration Tab ............................................................................................................ 8 Figure 2.ADC Configuration Tab ................................................................................................................. 9 Figure 3.ADC Volume Controls Tab .......................................................................................................... 10 Figure 4.Mix Volume Controls Tab ............................................................................................................ 11 Figure 5.Register Maps Tab - CS53L21 ................................................................................................... 12 Figure 6.Routing 4 ..................................................................................................................................... 14 Figure 7.Routing 6 ..................................................................................................................................... 14 Figure 8.Routing 8 ..................................................................................................................................... 15 Figure 9.Routing 10 ................................................................................................................................... 15 Figure 10.0 dB FFT, Single-Speed Mode ................................................................................................. 17 Figure 11.0 dB FFT, Double-Speed Mode ................................................................................................ 17 Figure 12.-60 dB FFT, Single-Speed Mode .............................................................................................. 17 Figure 13.-60 dB FFT, Double-Speed Mode ............................................................................................. 17 Figure 14.No Input FFT, Single-Speed Mode ........................................................................................... 17 Figure 15.No Input FFT, Double-Speed Mode .......................................................................................... 17 Figure 16.THD+N vs. Frequency, Single-Speed Mode ............................................................................. 18 Figure 17.THD+N vs. Frequency, Double-Speed Mode ........................................................................... 18 Figure 18.THD+N vs. Amplitude, Single-Speed Mode .............................................................................. 18 Figure 19.THD+N vs. Amplitude, Double-Speed Mode ............................................................................ 18 Figure 20.Fade-to-Noise Linearity, Single-Speed Mode ........................................................................... 18 Figure 21.Fade-to-Noise Linearity, Double-Speed Mode .......................................................................... 18 Figure 22.Frequency Response, Single-Speed Mode .............................................................................. 19 Figure 23.Frequency Response, Double-Speed Mode ............................................................................. 19 Figure 24.Channel Crosstalk, Single-Speed Mode ................................................................................... 19 Figure 25.Channel Crosstalk, Double-Speed Mode .................................................................................. 19 Figure 26.Block Diagram ........................................................................................................................... 22 Figure 27.CS53L21 (Part of Schematic Sheet 1) ...................................................................................... 23 Figure 28.Analog I/O (Part of Schematic Sheet 1) .................................................................................... 24 Figure 29.S/PDIF I/O (Schematic Sheet 2) ............................................................................................... 25 Figure 30.FPGA (Schematic Sheet 3) ....................................................................................................... 26 Figure 31.Level Shifters & I/O Stake Header (Schematic Sheet 4) .......................................................... 27 Figure 32.Control Port I/O (Schematic Sheet 5) ....................................................................................... 28 Figure 33.Power (Schematic Sheet 6)lm .................................................................................................. 29 Figure 34.Silk Screen ................................................................................................................................ 30 Figure 35.Top-Side Layer ......................................................................................................................... 31 Figure 36.Bottom-Side Layer .................................................................................................................... 32
LIST OF TABLES
Table 1. MCLK and Clock/Data Routing Options ...................................................................................... 13 Table 2. CS53L21 H/W Mode Control ....................................................................................................... 16 Table 3. System Connections ................................................................................................................... 20 Table 4. Jumper Settings .......................................................................................................................... 21
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CDB53L21 1. SYSTEM OVERVIEW
The CDB53L21 evaluation board is an excellent means for evaluating the CS53L21 ADC. Digital audio signal outputs are provided, and an FPGA is used for easily configuring the board. Section 2. "Software Mode Control" on page 7 and Section 3. "Hardware Mode Control" on page 13 provide configuration details. The CDB53L21 schematic set has been partitioned into seven pages and is shown in Figures 27 through 33. "System Connections and Jumpers" on page 20 provides a description of all stake headers and connectors, including the default factory settings for all jumpers.
1.1
Power
Power is supplied to the evaluation board through the +5.0 V binding posts. Jumpers connect the ADC's supplies to a regulated voltage of +1.8 V, 2.5 V or +3.3 V for VL and +1.8 V or 2.5 V for VD and VA. All voltage inputs must be referenced to the black binding post ground connector. For current measurement purposes only, a series resistor is connected to each supply. The current is easily calculated by measuring the voltage drop across this resistor. NOTE: The stake headers connected in parallel with these resistors must be shunted with the supplied jumper during normal operation.
WARNING: Please refer to the CS53L21 data sheet for allowable voltage levels.
1.2
Grounding and Power Supply Decoupling
The CS53L21 requires careful attention to power supply and grounding arrangements to optimize performance. The CDB53L21 demonstrates these optimal arrangements. Figure 26 on page 22 provides an overview of the connections to the CS53L21. Figure 34 on page 30 shows the component placement, Figure 35 on page 31 shows the top layout, and Figure 36 on page 32 shows the bottom layout. The decoupling capacitors are located as close to the CS53L21 as possible. Extensive use of ground plane fill in the evaluation board yields large reductions in radiated noise.
1.3
FPGA
The FPGA provides digital signal routing between the CS53L21, CS8406 and the I/O stake header. It also configures the Hardware Mode options of the CS8406 and provides routing control of the system master clock from an on-board oscillator and the I/O stake header. The Cirrus FlexGUI software and "FPGA H/W Control" switches provide full control of the FPGA's routing and configuration options. Section 2. "Software Mode Control" on page 7 and Section 3. "Hardware Mode Control" on page 13 provide configuration details.
1.4
CS53L21 Audio A to D Converter
A complete description of the CS53L21 (Figure 27 on page 23) is included in the CS53L21 product data sheet. The CS53L21 may be configured using either the Cirrus FlexGUI or the on-board "CS53L21 H/W Control" switches. The Software Mode control port registers are accessible through the "Register Maps" tab of the Cirrus FlexGUI software. This tab provides low-level control of each bit. For easier configuration, additional tabs provide high-level control. The Hardware Mode, stand-alone controls for the CS53L21 are accessible through the on-board, stand-alone switches, "CS53L21 H/W Control." Clock and data source selections are made in the control port of the FPGA, accessible through the "General Configurations" tab of the Cirrus FlexGUI software or through the on-board "FPGA H/W Control" switches. Section 2. "Software Mode Control" on page 7 and Section 3. "Hardware Mode Control" on page 13 provide configuration details.
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1.5 CS8406 Digital Audio Transmitter
A complete description of the CS8406 transmitter (Figure 29 on page 25) and a discussion of the digital audio interface are included in the CS8406 data sheet. The CS8406 converts the PCM data generated by the CS53L21 to the standard S/PDIF data stream and routes this signal to the optical and RCA connectors. The CS8406 operates in slave mode only, accepting either a 128xFs or 256xFs master clock, and can operate in either the Left-Justified or IS interface format. Selections are made in the control port of the FPGA, accessible through the "General Configurations" tab of the Cirrus FlexGUI software or through the on-board switches, "FPGA H/W Control." Section 2. "Software Mode Control" on page 7 and Section 3. "Hardware Mode Control" on page 13 provide configuration details.
1.6
Oscillator
The on-board oscillator provides one of the system master clocks. Selections are made in the control port of the FPGA, accessible through the "General Configurations" tab of the Cirrus FlexGUI software or through the on-board switches, "FPGA H/W Control." Section 2. "Software Mode Control" on page 7 and Section 3. "Hardware Mode Control" on page 13 provide configuration details. The oscillator is mounted in pin sockets, allowing easy removal or replacement. Additional sockets are also installed, allowing the optional use of a full- or half-can-sized oscillator.
1.7
I/O Stake Headers
The evaluation board has been designed to allow interfacing with external systems via a serial port header (reference designation J5) and a control port header, "CS53L21 S/W Control." The serial port header provides access to the serial audio signals required to interface with a DSP (Figure 31 on page 27). Selections are made in the control port of the FPGA, accessible through the "General Configurations" tab of the Cirrus FlexGUI software or through the on-board switches, "FPGA H/W Control." Section 2. "Software Mode Control" on page 7 and Section 3. "Hardware Mode Control" on page 13 provide configuration details. The control port header provides bidirectional access to the SPITM/IC(R) control port signals by simply removing all the shunt jumpers from the "PC" position. The user may then choose to connect a ribbon cable to the "CONTROL" position, allowing operation of the CS53L21 in a user-application for system development. A single "GND" row for the ribbon cable's ground connection is provided to maintain signal integrity. Two unpopulated pull-up resistors are also available should the user choose to use the CDB for the IC power rail.
1.8
Analog Input
RCA connectors supply the line-level analog inputs through an AC-coupled passive filter. The signal from these inputs may be driven to individual inputs or to all inputs of the CS53L21. A microphone may be connected to one or both of the 1/8" jacks, MIC1 and MIC2. To accommodate the microphone bias output available on certain input pins of the CS53L21, additional stake headers are provided to MUX both the input audio signal and the output bias signal to or from the CS53L21. Figure 28 on page 24 in the schematic set illustrates how signals are routed. Table 4 on page 21 provides more details for how to connect the jumpers. The CS53L21 data sheet details the required singleended signal amplitude that will drive the inputs to full scale.
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1.9 Stand-Alone Switches
The "FPGA H/W Control" and "CS53L21 H/W Control" switches control all Hardware Mode options. Section 3. "Hardware Mode Control" on page 13 provides a description of each topology.
1.10
Control Port Connectors
A graphical user interface is available for the CDB53L21, allowing easy manipulation of each register. This GUI interfaces with the CDB via the RS-232 or USB connectors and controls all Software Mode options. Section 2. "Software Mode Control" on page 7 provides a description of the Graphical User Interface (GUI).
1.10.1 RS-232 and USB Connectors
Connecting a cable to the RS-232 connector or the USB 1.0/2.0 connector and launching the Cirrus FlexGUI software enables the CDB53L21 in Software Mode.
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CDB53L21 2. SOFTWARE MODE CONTROL
The CDB53L21 may be used with the Microsoft Windows-based FlexGUI graphical user interface, allowing software control of the CS53L21 and FPGA registers. The latest control software may be downloaded from www.cirrus.com/msasoftware. Step-by-step instructions for setting up the FlexGUI are provided as follows: 1. Download and install the FlexGUI software as instructed on the Website. 2. Connect and apply power to the +5.0 V binding post. 3. Connect the CDB to the host PC using either a 9-pin serial or USB cable. 4. Launch the Cirrus FlexGUI. Once the GUI is launched successfully, all registers are set to their default reset state. 5. Enable the CS53L21 by engaging the "Enable CS53L21" push button. 6. Refresh the GUI by clicking on the "Update" button. The default state of all registers are now visible. 7. Engage and then disengage the "Power Down" push button in the "ADC Basic Configurations" group. This performs the necessary write sequence to the CS53L21 for Software Mode operation. For standard setup: 8. Set up the signal routing in the "General Configurations" tab as desired. 9. Set up the CS53L21 in the "ADC Configuration", "ADC Volume Controls" or "Mix Volume Controls" tab as desired. 10. Begin evaluating the CS53L21. For quick setup, the CDB53L21 may, alternatively, be configured by loading a predefined sample script file:
11. On the File menu, click "Restore Board Registers..." 12. Browse to Boards\CDB53L21\Scripts\. 13. Choose any one of the provided scripts to begin evaluation. To create personal scripts files:
14. On the File menu, click "Save Board Registers..." 15. Enter any name that sufficiently describes the created setup. 16. Choose the desired location and save the script. 17. To load this script, follow the instructions from step 11 above.
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CDB53L21
2.1 General Configuration Tab
The "General Configuration" tab provides high-level control of signal routing on the CDB53L21. This tab also includes basic controls for the CS53L21 for quickly setting up the CDB53L21 in simple configurations. Status text detailing the ADC's specific configuration is shown in parenthesis or appears directly below the associated control. This text may change depending on the setting of the associated control. A description of each control group is outlined below: ADC Basic Configuration - Includes basic register controls in the CS53L21 used for setting up the interface format, clocking functions and internal analog input routing. See Section 2.2 through Section 2.4 for more CS53L21 controls. S/PDIF Transmitter Control - Includes all available Hardware Mode controls for setting up the CS8406. Clock/Data Routing and ADC Reset - Includes controls used for routing clocks and data between the CS53L21, oscillator and the I/O stake header. Also included is a reset control for the CS53L21. Update - Reads all registers in the FPGA and CS53L21 and reflects the current values in the GUI. Reset - Resets FPGA to default routing configuration.
Figure 1. General Configuration Tab
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2.2 ADC Configuration Tab
The "ADC Configuration" tab provides high-level control of all setup configurations for the CS53L21. Status text detailing the ADC's specific configuration is shown in parenthesis or appears directly below the associated control. This text will change depending on the setting of the associated control. A description of each control group is outlined below (a description of each register is included in the CS53L21 data sheet): Power Control - Includes all register controls for powering down specific circuits within the CS53L21. ADC input Configuration - Includes controls for the internal MUX, analog input, microphone bias output and channel mix. Serial Port Configuration - Includes controls for all settings related to the transmission and relationship of data and clocks within the CS53L21. Update - Reads all registers in the CS53L21 and reflects the current values in the GUI. Reset - Resets the CS53L21.
Figure 2. ADC Configuration Tab
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2.3 ADC Volume Controls Tab
The "ADC Volume Controls" tab provides high-level control of all volume settings in the ADC of the CS53L21. Status text detailing the ADC's specific configuration is shown in parenthesis or inside the control group of the affected control. This text will change depending on the setting of the associated control. A description of each control group is outlined below (a description of each register is included in the CS53L21 data sheet): Digital Volume Control - Includes digital volume controls and adjustments for the ADC. ALC Configuration - Includes all configuration settings for the Automatic Level Control (ALC). Analog Volume Control - Includes all analog volume controls and adjustments for the ADC. Noise Gate Configuration - Includes all configuration settings for the noise gate. Update - Reads all registers in the CS53L21 and reflects the current values in the GUI. Reset - Resets the CS53L21.
Figure 3. ADC Volume Controls Tab
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2.4 Mix Volume Controls Tab
The "Mix Volume Controls" tab provides high-level control of the ADC channel mix functions. Status text detailing the ADC's specific configuration is shown in read-only edit boxes or appears directly below the associated control. This text will change, depending on the setting of the associated control. A description of each control group is outlined below (a description of each register is included in the CS53L21 data sheet): Digital Volume Control - ADC channel mix volume controls and adjustments. Update - Reads all registers in the CS53L21 and reflects the current values in the GUI. Reset - Resets the CS53L21.
Figure 4. Mix Volume Controls Tab
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2.5 Register Maps Tab
The Advanced Register Debug tab provides low-level control of the CS53L21 individual register settings. Register values can be modified bit-wise or byte-wise. For bit-wise, click the appropriate push-button for the desired bit. For byte-wise, the desired hex value can be typed directly into the register address box in the register map. The "FPGA" and "GPIO" tabs may be ignored.
Figure 5. Register Maps Tab - CS53L21
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CDB53L21 3. HARDWARE MODE CONTROL
The CDB may be configured without the use of a software control port through the use of two switches, "FPGA H/W Control" and "CS53L21 H/W Control." These switches are enabled in Hardware Mode only and ignored in Software Mode. The CDB53L21 automatically enters Hardware Mode upon initial power up, or when exiting Software Mode, by terminating the Cirrus FlexGUI software or by disconnecting the RS-232 serial cable or USB cable.
3.1
FPGA H/W Control
The "FPGA H/W Control" switch S3 sets up the CDB in 4 pre-defined routing topologies in Hardware Mode. The tables and figures below describe each switch setting. The At-A-Glance Controls table provides a quick reference for all presets. At-A-Glance Controls S[3:2] S[1] (See Note 1.) S[0]
00 - Reserved 01 - I/O Header MCLK / I/O Header clocks/data route through FPGA 10 - Oscillator MCLK / I/O Header clocks/data route through FPGA 11 - Reserved 0 - CS53L21 Slave Routing 0 - No Loopback Routing 1 - CS53L21 Master Routing 1 - Reserved
Signal S[3:0] Routing
0 1 2 3 4 0000 0001 0010 0011
General Description
Detailed Description
Reserved Reserved Reserved Reserved I/O MCLK 1) I/O masters MCLK. 2) I/O masters PCM clocks. 3) SDOUT to CS8406 and I/O Header 1) I/O masters MCLK. 2) CS53L21 masters PCM clocks. 3) SDOUT to CS8406 and I/O Header
Figure 6
5 6
0100 0101 0110 0111
I/O Clocks/Data Reserved CS53L21 Clocks, I/O Data Reserved Oscillator MCLK I/O Clocks/Data Reserved CS53L21 Clocks, I/O Data Reserved
Figure 7
7 8
Figure 8
9 10
1000 1001 1010
1) Oscillator masters MCLK. 2) I/O masters PCM clocks. 3) SDOUT to CS8406 and I/O Header 1) Oscillator masters MCLK. 2) CS53L21 masters PCM clocks. 3) SDOUT to CS8406 and I/O Header
Figure 9
11 1011 12-15 Reserved
Table 1. MCLK and Clock/Data Routing Options
Notes: 1. The S[1] setting affects FPGA signal routing only and is independent of the M/S setting of the "CS53L21
H/W Control" switch S5. These settings must be made manually by the user and have to be consistent.
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CDB53L21
Oscillator CS53L21
MCLK LRCK/SCLK
SDOUT
CS8406
OMCK (256Fs) ILRCK/ ISCLK SDIN (LJ)
I/O Header
MCLK LRCK/SCLK SDOUT
Figure 6. Routing 4
Oscillator CS53L21
MCLK LRCK/SCLK
SDOUT
CS8406
OMCK (256Fs) ILRCK/ ISCLK SDIN (LJ)
I/O Header
MCLK LRCK/SCLK SDOUT
Figure 7. Routing 6
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Oscillator CS53L21
MCLK LRCK/SCLK
SDOUT
CS8406
OMCK (256Fs) ILRCK/ ISCLK SDIN (LJ)
I/O Header
MCLK LRCK/SCLK SDOUT
Figure 8. Routing 8
Oscillator CS53L21
MCLK LRCK/SCLK
SDOUT
CS8406
OMCK (256Fs) ILRCK/ ISCLK SDIN (LJ)
I/O Header
MCLK LRCK/SCLK SDOUT
Figure 9. Routing 10
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3.2 CS53L21 H/W Control
The stand-alone "CS53L21 H/W Control" switch S5 controls the Hardware Mode options of the CS53L21. A description of each switch is outlined in the following table. See the CS53L21 Data Sheet, Section 4.2 "Hardware M ode" for further details on setting these switches. Switch Position
M/S (Note 1.) MCLKDIV2 I2S/LJ (Note 2.) LO HI LO HI LO HI
Function
LRCK and SCLK are inputs to CS53L21. LRCK and SCLK are outputs to CS53L21. Internal MCLK to CS53L21 not divided. Internal MCLK to CS53L21 divided by 2. CS53L21 Interface Format: Left-Justified. CS53L21 Interface Format: IS. Table 2. CS53L21 H/W Mode Control
Notes:
1. The M/S setting affects the CS53L21 only and is independent of S[1] setting in the "FPGA H/W Control" switch S3. These settings must be made manually by the user and have to be consistent. 2. The I2S/LJ setting affects the CS53L21 only. The S/PDIF Transmitter input data format in HW Mode is always LJ and is independent of this setting. If the user desires I2S format PCM SDOUT data, the I/O Header will have to be used.
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CDB53L21 4. PERFORMANCE PLOTS
+0 -10 -20 -30 -40 -50 -60 -70 d B F S -80 -90 -100 -110 -120 -130 -140 -150 -160
-170 d B F S +0 -10 -20 -30 -40 -50 -60 -70 -80 -90 -100 -110 -120 -130 -140 -150 -160
-170 -180 20
-180 20 50 100 200 500 Hz 1k 2k 5k 10k 20k
50
100
200
500 Hz
1k
2k
5k
10k
20k
Figure 10. 0 dB FFT, Single-Speed Mode
+0 -10 -20 -30 -40 -50 -60 -70 d B F S -80 -90 -100 -110 -120 -130 -140 -150 -160 -170 -180 20 50 100 200 500 Hz 1k 2k 5k 10k 20k d B F S +0 -10 -20 -30 -40 -50 -60 -70 -80 -90 -100 -110 -120 -130 -140 -150 -160 -170 -180 20
Figure 11. 0 dB FFT, Double-Speed Mode
50
100
200
500 Hz
1k
2k
5k
10k
20k
Figure 12. -60 dB FFT, Single-Speed Mode
Figure 13. -60 dB FFT, Double-Speed Mode
+0 -10 -20 -30 -40 -50 -60 -70 d B F S -80 -90 -100 -110 -120 -130 -140 -150 -160 -170 -180 20 50 100 200 500 Hz 1k 2k 5k 10k 20k d B F S
+0 -10 -20 -30 -40 -50 -60 -70 -80 -90 -100 -110 -120 -130 -140 -150 -160 -170 -180 20 50 100 200 500 Hz 1k 2k 5k 10k 20k
Figure 14. No Input FFT, Single-Speed Mode
Figure 15. No Input FFT, Double-Speed Mode
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-80
-66 -68 -70
-82
-84
-72 -74
-86
-76 -78 d B F S -80 -82 -84 -86 -88
-88
-90
-92
-94
-90 -92 -94
-96
-98
-96 -98
-100 20
50
100
200
500 Hz
1k
2k
5k
10k
20k
-100 20
50
100
200
500 Hz
1k
2k
5k
10k
20k
Figure 16. THD+N vs. Frequency, Single-Speed Mode
Figure 17. THD+N vs. Frequency, Double-Speed Mode
-80 -82
-80 -82
-84
-84
-86
-86
-88
-88 d B F S
-90
-90
-92
-92
-94
-94
-96
-96
-98
-98
-100 -120
-110
-100
-90
-80
-70
-60 dBr
-50
-40
-30
-20
-10
-100 -120
-100
-80
-60 dBr
-40
-20
Figure 18. THD+N vs. Amplitude, Single-Speed Mode
Figure 19. THD+N vs. Amplitude, Double-Speed Mode
+10
T
TT
T
+10
TT
T
T
+8
+8
+6
+6
+4
+4
+2 d B F S
+2
+0
+0
-2
-2
-4
-4
-6
-6
-8
-8
-10 -140
-120
-100
-80 dBr
-60
-40
-20
+0
-10 -140
-120
-100
-80 dBr
-60
-40
-20
+0
Figure 20. Fade-to-Noise Linearity, Single-Speed Mode
Figure 21. Fade-to-Noise Linearity, Double-Speed Mode
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+0 -0.2 -0.4 -0.6 -0.8
d B F S +0
-0.2
-0.4
-0.6
-0.8
-1 -1.2 -1.4 -1.6 -1.8
-1
-1.2
-1.4
-1.6
-1.8
-2 20
50
100
200
500 Hz
1k
2k
5k
10k
20k
-2 20
50
100
200
500 Hz
1k
2k
5k
10k
20k
Figure 22. Frequency Response, Single-Speed Mode
Figure 23. Frequency Response, Double-Speed Mode
+0
+0 -10 -20 -30
-10
-20
-30 -40 -40 d B F S -50 -60 -70 -70 -80 -80 -90 -100
-50
-60
-90
-100 20
50
100
200
500 Hz
1k
2k
5k
10k
20k
-110 20
50
100
200
500 Hz
1k
2k
5k
10k
20k
Figure 24. Channel Crosstalk, Single-Speed Mode
Figure 25. Channel Crosstalk, Double-Speed Mode
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CDB53L21 5. SYSTEM CONNECTIONS AND JUMPERS
CONNECTOR
+5V GND RS232 USB S/PDIF OPTICAL OUT S/PDIF COAX OUT I/O Header S/W CONTROL MICRO JTAG FPGA JTAG MICRO RESET FPGA PROGRAM H/W BOARD RESET LINEB LINEA MIC1 MIC2
REF
J26 J27 J95 J94 OPT2 J68 J5 J109 J110 J78 S4 S2 S1 J62 J7 J35 J51
INPUT/OUTPUT
Input Input Input/Output Input/Output Output Output Input/Output Input/Output Input/Output Input/Output Input Input Input Input Input +5.0 V Power Supply. Ground Reference .
SIGNAL PRESENT
Serial connection to PC for SPI / IC control port signals. USB connection to PC for SPI / IC control port signal. CS8406 digital audio output via optical cable. CS8406 digital audio output via coaxial cable. I/O for Clocks & Data. I/O for external SPI / IC control port signals. I/O for programming the micro controller (U84). I/O for programming the FPGA (U14). Reset for the micro controller (U84). Reload Xilinx Flash program into the FPGA (U14). Reset for the CS53L21 (U1). RCA phono jacks for analog input signal to CS53L21. Microphone jacks for analog input signal to CS53L21.
Table 3. System Connections
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JMP
J31
LABEL
VL
PURPOSE
Selects source of voltage for the VL supply Selects source of voltage for the VA supply Selects source of voltage for the VD supply Current Measurement
POSITION
*+1.8V +2.5V +3.3V *+1.8V +2.5V *+1.8V +2.5V
FUNCTION SELECTED
Voltage source is +1.8 V regulator. Voltage source is +2.5 V regulator. Voltage source is +3.3 V regulator. Voltage source is +1.8 V regulator. Voltage source is +2.5 V regulator. . Voltage source is +1.8 V regulator. Voltage source is +2.5 V regulator. . 1 series resistor in power supply path. LINEB signal routed to jumper J8. LINEB signal routed to jumper J3. LINEB signal routed to AIN1B of ADC. LINEA signal routed to jumper J14. LINEA signal routed to AIN2A of ADC. LINEA signal routed to AIN1A of ADC. Bias on AIN2B of ADC routed to jumper J12. Bias on AIN2B of ADC routed to MIC1. LINEB MUX routed to AIN2B of ADC. Bias on AIN3B of ADC routed to jumper J12. MIC2 signal routed to AIN3B of ADC. LINEB MUX routed to AIN3B of ADC. MIC2 signal routed to AIN3A of ADC. MIC1 signal routed to AIN3A of ADC. LINEA MUX routed to AIN3A of ADC. J3 (for Bias on AIN2B of ADC) routed to MIC2. J8 (for Bias on AIN3B of ADC) routed to MIC2. Jumper placed on pin 2.
J25 J28 J52 J47 J53
VA VD VL VA VD
*SHUNTED 1 series resistor is shorted. OPEN (AIN3B Select)
J2
LINEB MUX
Selects signal source for the ADC I/O
(AIN2B Select) *AIN1B (AIN3A Select) AIN2A *AIN1A BIAS1 to MIC2 BIAS1 to MIC1 *LINEB BIAS2 to MIC2 MIC2 *LINEB MIC2
J1
LINEA MUX
Selects signal source for the ADC I/O
J3
(AIN2B Select)
Selects signal source for MIC1 and MIC2 bias or signal source for the ADC input
J8
(AIN3B Select)
Selects signal source for MIC2 bias or signal source for the ADC input
J14
(AIN3A Select)
Selects signal source for the ADC input
MIC1 *LINEA BIAS1 BIAS2 *Not connected
J12
MIC2 Bias
Selects bias for MIC2
*Default factory settings Table 4. Jumper Settings
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22 DS700DB1
6. BLOCK DIAGRAM
Hardware Mode Switches
Figure 27 on page 23
Reset Reset
Software Mode Control Port
Figure 32 on page 28
IC/SPI Header
Figure 27 on page 23
Figure 30 on page 26
Hardware Mode Switches
MCLK
S/PDIF Out
(CS8406)
Analog Input FPGA
Figure 30 on page 26
CS53L21
Figure 27 on page 23
Figure 28 on page 24
Figure 29 on page 25
Reset MCLK Reset
Oscillator (socket)
Figure 31 on page 27
Clocks/Data Header
Figure 31 on page 27
CDB53L21
Figure 26. Block Diagram
7. SCHEMATICS
DS700DB1 23
CDB53L21
Figure 27. CS53L21 (Part of Schematic Sheet 1)
24
CDB53L21
DS700DB1
Figure 28. Analog I/O (Part of Schematic Sheet 1)
DS700DB1
CDB53L21
Figure 29. S/PDIF I/O (Schematic Sheet 2)
25
26
CDB53L21
DS700DB1
Figure 30. FPGA (Schematic Sheet 3)
DS700DB1
CDB53L21
Figure 31. Level Shifters & I/O Stake Header (Schematic Sheet 4)
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28
CDB53L21
DS700DB1
Figure 32. Control Port I/O (Schematic Sheet 5)
DS700DB1
CDB53L21
Figure 33. Power (Schematic Sheet 6)lm
29
30 DS700DB1
8. BOARD LAYOUT
CDB53L21
CS53L21
CS53L21
CS53L21
CDB53L21
Figure 34. Silk Screen
DS700DB1
Figure 35. Top-Side Layer
CDB53L21
31
32
CDB53L21
DS700DB1
Figure 36. Bottom-Side Layer
CDB53L21 9. REVISION HISTORY
Revision DB1 Initial Release Changes
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 AIRCRAFT SYSTEMS, MILITARY APPLICATIONS, 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. IC is a registered trademark of Philips Semiconductor. SPI is a trademark of Motorola, Inc. Windows is a registered trademark of Microsoft Corporation.
DS700DB1
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