SAF784X

General description

The SAF784x is a single-chip solution CD audio decoder with on-chip MP3 and WMA decoding, digital servo, audio DAC, sample-rate converter, preamplifier, laser driver and integrated ARM7TDMI-S microprocessor. The device contains all of the required ROM and RAM, including an internal re-programmable Flash ROM, and is targeted at low-cost compressed audio CD applications. The design is a one-chip CD audio decoder IC, with additions to allow low-cost system implementation of MP3 and WMA decoding.

Features

• Channel decoder and digital servo
• 32-bit embedded ARM7 RISC microprocessor supporting both 32-bit and 16-bit ('Thumb') instruction sets
• Maximum ARM operating frequency of 76 MHz, equivalent to 68 MIPS
• Decoding of compressed audio stream (MP3/WMA) on ARM7 core
• All memories required for MP3/WMA decoding embedded on chip: combination of 130 kB mask-programmed internal program ROM (to reduce wait-states on high-speed code, e.g. decompression algorithms), 42 kB boot ROM, 64 kB of internal re-programmable Flash ROM (for simple re-programming of application code) 110 kB internal SRAM
• Programmable clock frequency for ARM microprocessor - allowing users to trade-off power consumption and processing power depending on requirements
• Block decoder hardware to perform C3 error correction
• Sample-rate converter circuit to convert compressed audio sample rates (in the range 8 kHz to 48 kHz) to an output rate of 44.1 kHz
• Microprocessor access to digital representations of the diode input signals from the optical pickup; the microprocessor can also generate the servo output signals RA, FO, SL, allowing the possibility of additional servo algorithms in software
• Programmable PDM outputs (effectively sine and cosine) to allow use of stepper motor for sledge mechanism
• Microprocessor access to audio streams, both from the internal CD decoder and an external stereo auxiliary input (e.g. an analog source from a tuner, converted to digital via on-chip ADCs) to allow audio processing algorithms in the ARM microprocessor, e.g. bass boost, volume control
• Four general-purpose analog inputs (A_IN1 to A_IN4) allowing the ARM microprocessor access to other external analog signals, e.g. low-cost keypad, temperature sensor, via on-chip ADCs
• Two additional analog audio inputs (AUX_L, AUX_R) to allow the ARM microprocessor access to external audio signals (e.g. tuner); allows audio algorithms (e.g. bass boost) to be performed on external audio signals
• Real-time clock operated from separate 32 kHz crystal; allows low-power Standby mode with real-time clock still operational
• Watchdog timer
• I²S-bus, S/PDIF, subcode (V4) and subcode sync outputs
• 32 GPIOs
• Two standard UART channels
• Two external interrupt pins
• I²C-bus interface configurable for master or slave modes, supporting 100 kbit/s and 400 kbit/s standards
• Slave I²S-bus mode, in which the channel decoder can synchronize the CD playback speed to an I²S-bus clock input
• Integrated digital HF/Mirror detector with measurement of minimum and maximum peak values, amplitude and offset
• Integrated CD-text decoder
• Up to 6x decode speed, CLV or CAV modes
• LQFP144 package with 0.5 mm pin pitch
• Separate left and right channel digital silence detection available on KILL pins
• Digital silence detection available on loopback data from external source as well as internal data
• 'Filterless' pseudo bit stream audio DAC with minimal external components
• Stereo line outputs for audio DAC
• Loopback mode allowing the use of integrated DAC with external I²S-bus/EIAJ sources
• Compatible with voltage mode mechanisms
• On-chip buffering and filtering of the diode signals from the mechanism in order to optimize the signals for the decoder and servo parts
• LF (servo) signals converted to digital representations by Sigma-Delta ADCs shared between pairs of channels to minimize DC offset between channels
• HF part summed from signals D1 to D4 and converted to digital signals by HF 6-bit ADC
• Selectable DC offset cancellation of quiescent mechanism voltages and dark currents, digitally controlled; additional fine DC-offset cancellation in digital domain
• Eye pattern monitor system to observe selectable points within the analog pre-amp
• Current and average jitter values available via registers
• On-chip laser power control, up to maximum currents of 120 mA
• Laser on-off control, including 'soft'-start control - zero-to-nominal output power in 1 ms
• Monitor control and feedback circuit to maintain nominal output power throughout laser life
• Configured for Nsub (N-substrate) monitor diode
• JTAG interface for device access and ARM code development (compatible with ARM multi-ICE)
• All digital input pins 5 V tolerant
• Low-latency static memory interface to access a maximum of two 2 MB memory
• This product has been qualified in accordance with AEC-Q100

Products/packages

Pricing/ordering/availability

Applications

Reads the following CD-decode formats

• CD-R
• CD-RW
• CD-DA (CD Red Book; IEC 60908)
• CD-ROM (Mode 1 and Mode 2)
• CD-MP3
• CD-WMA
• Video CD
• SACD (CD layer only)
• Support 80 minute to 100 minute CD playback
• Multi-session discs

Parametrics/similar products

Similar products
SAF784X links to the similar products page containing an overview of products that are similar in function or related to the type number(s) as listed on this page. The similar products page includes products from the same catalog tree(s), relevant selection guides and products from the same functional category.

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