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CS48DV2

Product Status Notice

CS48DV2Not Recommended for New Designs

Recommended for New Designs: CS485xx Family

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

The CS48DV2 audio DSP 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.

Specifications Table

View Table

Documentation

CS48DV2B Product Data Sheet
2/2009, DS875F2 : 466 Kb
CS48DV2/6 Product Bulletin
2/2008, 0204-1007-PB v1.0.3 : 3255 Kb

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