CirrusCS470xx High Performance Analog and Digital Audio Processing Solutions

/a>Amplifier” title=”Amplifier”>Amplifier” title=”Amplifier”>Amplifier, Car Processor, DTV, MP3 Docking Station, AVR and DVD RX, DSP Controlled Speakers. This article introduces the main features of the CS470xx series, block diagram , CDB47xxxS motherboard block diagram, circuit diagram and main components, CDB47xxx-DC48 daughter board block diagram, circuit diagram and main components.

The CS470xx DSP is designed to provide high-performance post-processing and mixing of analog and digital audio. Dual clock domains are supported when the DAI and SPDIF RX inputs are used together. Integrated sample rate converters (SRCs) allow audio streams with different sample rates to be mixed. The low-power standby preserves battery life for applications that are always on, but not necessarily processing audio, such as automotive audio systems.

The CS470xx family is a new generation of audio system-on-a-chip (ASOC) targeted processors at high fidelity, cost sensitive designs. Derived from the highly successful CS48500 32-bit fixed-point audio enhancement processor family, the CS470xx further simplifies system design and reduces total system cost by integrating the S/PDIF Rx, S/PDIF Tx, analog inputs, analog outputs, and SRCs. For example, a hardware SRC can down-sample a 192 kHz S/PDIF stream to a lower Fs to reduce memory and MIPS requirements for processing. This integration effectively reduces the chip count from 3 to 1, which allows smaller, less expensive board designs.

Typical applications of CS470xx series:

 Automotive head units and outboard amplifiers

 Automotive processors and automotive integration hubs

 Digital TV

 MP3 docking stations

 AVR and DVD RX

 DSP controlled speakers (subwoofers, sound bars)

The CS470xx is programmed using the simple yet powerful Cirrus proprietary DSP Composer™ GUI development and pre-production tuning tool. Processing chains can be designed using a drag-and-drop interface to place/utilize functional macro audio DSP primitives and custom audio filtering blocks . The end result is a software image that is downloaded to the DSP via serial control port.

The Cirrus Framework™ programming environment offers Assembly and C language compilers and other software development tools for porting existing code to the CS470xx family platform.

The CS470xx is available in a 100-pin LQFP package with exposed pad for better thermal characteristics. Both Commercial (0°C to +70°C) and Automotive (–40°C to +85°C) temperature grades.

CS470xx series main features:

 Cost-effective, High-performance 32-bit DSP

 300,000,000 MAC/S (multiply accumulates per second)

 Dual MAC cycles per clock

 72-bit accumulators are the highest precision in the industry

 32K x 32-bit SRAM with three 2K blocks assignable to either Y data or program memory

 Integrated DAC and ADC Functionality

 8† Channels of 24-bit DAC output: 108dB DR, –98dB THD+N

 4† Channels of 24-bit ADC input: 105dB DR, –98dB THD+N

 Integrated 5:1 analog mux feeds one stereo ADC

 Configurable Serial Audio Inputs and Outputs

 Integrated 192 kHz S/PDIF Rx

 Integrated 192 kHz S/PDIF Tx

 Supports 32-bit serial data @ 192 kHz

 Supports 32-bit audio sample I/O between DSP chips

 TDM I/O modes

 Supports Different Sample Rates (Fs)

 Three integrated hardware SRC blocks

 Output can be master or slave

 Supports dual-domain Fs on S/PDIF vs. I²S inputs

 DSP Tool Set with Private Keys Protect Customer IP

 Integrated Clock Manager/PLL

 Flexibility to operate from internal PLL, external crystal, external oscillator

 Input Fs Auto Detection w/ μC Acknowledgement

 Host Control and Boot via I²C™ or SPI™ Serial Interface

 Configurable GPIOs and External Interrupt Input

 1.8V Core and a 3.3VI/O that is tolerant to 5V input

 Low-power Mode

Figure 1. CS47048 block diagram

Figure 2. CDB47xxxS-DCxx Development Kit Outline Drawing

Figure 3. CDB47xxxS motherboard block diagram

Figure 4. CDB47xxx-DC48 Daughter Board Block Diagram

Figure 5. CDB47xxx-DC28 Daughter Board Block Diagram

Figure 6. CDB47xxxS (Single-Ended) Motherboard Outline Drawing: Top View

Figure 6 Components corresponding to CDB47xxxS (single-ended) motherboards:

1. +9V Power In

2. Optical S/PDIF Out

3. Coax S/PDIF Out

4. Optical S/PDIF In

5. Coax S/PDIF In

6. +5V Header

7. Line-Level Analog Outputs

8. CDB47xxS-DC48 Daughtercard Connectors

9. Mic Input

10. Single-Ended Line-Level Inputs

11. MCU Rotary Encoder

12. MCU Buttons

13. SPI Flash

14. I2C EEPROM

15. LCD

16. DSP DAO Header

17. IR Receiver

18. Board Reset

19. MCU Programming Header

20. MCU Control Bypass Header

21. USB Connector

22. DSP External Control Header

23. DSP DAI Header

24. +1.8V Header

25. Power LEDs (4)

26. +3.3V Header

Figure 7. CDB47xxx-DC48 Daughter Board Outline Drawing: Top View

Figure 7 Components corresponding to the CDB47xxx-DC48 daughter board:

1. Cirrus Logic CS47048 DSP

2. Power LEDs (2)

3. MCLK-XTAL_OUT Header

4. DSP GPIO Button

5. DSP GPIO LED

6. DSP GPIO LED

7. DSP GPIO Switch

8. +1.8VD Probe Point

9. +3.3VD Probe Point

10. +1.8VA Probe Point

11. +3.3VA Probe Point

Figure 8. CDB47xxxS (Single-Ended) Daughter Board Connector Circuit Diagram

Figure 9. CDB47xxxS (Single-Ended) Digital Audio Control Connector Circuit Diagram

Figure 10. CDB47xxxS (Single-Ended) Serial Memory Circuit Diagram

Figure 11. CDB47xxxS (Single-Ended) Microphone Preamp Circuit Diagram

Figure 12. CDB47xxxS (Single-Ended) Power Connector Circuit Diagram

Figure 13. CDB47xxxS (Single-Ended) ADC Filter Circuit Diagram

Figure 14. CDB47xxxS (Single-Ended) DAC Filter Circuit Diagram

Figure 15. CDB47xxxS (single-ended) MCU card interface circuit diagram

Figure 16. CDB47xxxS (single-ended) MCU card user interface circuit diagram (1)

Figure 17. CDB47xxxS (single-ended) MCU card user interface circuit diagram (2)

Figure 18. CDB47xxx-DC48 Daughter Board Block Diagram

Figure 19. CDB47xxx-DC48 Daughter Board Circuit Diagram
For details, see:
http://www.cirrus.com/en/pubs/proDatasheet/CS470xx_PP8.pdf