CS48DV2

Single-Core 32-Bit Fixed-Function Audio DSP for Dolby Volume-Enabled 2 Channel Products

Overview

Description

The CS48DV2 processor gives OEMs a cost effective, fixed-function, simple-to-design Dolby Volume 2.0 to 2.1 channel solution. Designed to provide high-performance volume control using the Dolby Volume algorithm, the low-power standby of the CS48DV2 DSP Family preserves battery life for applications which are always on, but not necessarily processing audio, such as portable audio systems.

The CS48DV2A and CS48DV2B are primarily differentiated by the maximum number of Dolby Volume processing channels supports - 2.0 Channels and 2.1 Channels respectively. The first device available to the market for mass production is the CS48DV2A which requires downloading a different Dolby Volume .uld files for each supported sample rate (32kHz, 44.1kHz and 48kHz).

The CS48DV2B has a majority of the code in ROM and hence only requires a single small download from the host controller. The CS48DV2B also is planned to support additional pre / post-processing modules or “overlays” that are capable of running concurrently with Dolby Volume processing.

Features

• Dolby Volume Overview:

• Consistent volume across all input sources and all content
• Consistent volume within the same program
• Eliminates need to constantly adjust volume
• Full, rich, and consistent experience at all volume levels
• Improved vocal and surround perception at low volume levels
• No artifacts or audible side effects

• CS48DV2 Processor Features:

• 2.0 to 2.1 Channel 32-bit fixed-function Dolby Volume processing (512 FFT Window / 20-Band)
• CS48DV2 supports up to 2.0 channels 32-bit PCM I/O at Fs of 32kHz, 44.1kHz & 48kHz (Rev. B)
• CS48DV2 supports up to 2.1 channels 32-bit PCM I/O at Fs of 32kHz, 44.1kHz & 48kHz (Rev. B)
• Integrated S/PDIF Transmitter
• 2 Channel DSD input support (Rev. B)
• SPI™/I2C® serial control port
• Low-power standby: 260µW
• 32KB Firmware image (per Fs) can be downloaded from either host microcontroller or from external SPI Flash device at speeds up to 12.288MHz (Rev. A)
• 300B Firmware image can be downloaded from either host microcontroller removing need for external memory (Rev. B)
• Package: 48-pin LQFP

• CS48DV2 Key Benefits:

• Easy to design – only 10 parameters to control from host microcontroller
• High-performance & low cost
• No external SRAM/SDRAM memory needed
• Dedicated part number simplifies tracking and reporting tasks, reducing liability
• Automatically detects incoming Fs and loads coefficients from internal memory (Rev. B)
• Automatically performs decimation on 2Fs (88.2kHz or 96kHz) or 4Fs (176.4kHz or 192kHz) audio to 1Fs (44.1kHz or 48kHz) and then processes audio at 1Fs rate
• Very short (5 ~ 10ms) propagation delay through DSP is ideal for DTV designs

Diagram

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