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SAF784X

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Datasheet

SAF784X
(Product Specification)
09-May-08, 93 pages, 397 kB

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SAF784X - One chip CD audio device with integrated MP3/WMA decoder

General description
Features
Products/packages
Quality/reliability/chemical content
Pricing/ordering/availability
Samples
Discontinued information
Applications
Block diagrams/pinning
Design support
Parametrics/similar products
Print/email
Disclaimers
All information hereunder is subject to the subsequent disclaimers

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

Type numberOrderable part numberOrdering code (12NC)Product statusPackagePackingMarkingECCN
SAF7843HL/M295SAF7843HL/M295,5579352 881 55557Volume productionSOT486-1
(LQFP144)
Tray Dry Pack, Bakeable, MultipleStandard Marking
SAF7849HL/M245SAF7849HL/M245,5579352 883 28557Volume productionSOT486-1
(LQFP144)
Tray Dry Pack, Bakeable, MultipleStandard Marking
SAF7849HL/M295SAF7849HL/M295,5579352 879 32557Volume productionSOT486-1
(LQFP144)
Tray Dry Pack, Bakeable, MultipleStandard Marking

Quality/reliability/chemical content

Type numberOrderable part numberChemical contentRoHSLeadfree Conversion dateRHFIRF (FIT)MTBF (hours)MSL
SAF7843HL/M295SAF7843HL/M295,557SAF7843HL_M295
Always Pb-free
SAF7849HL/M245SAF7849HL/M245,557SAF7849HL_M245
Always Pb-free
SAF7849HL/M295SAF7849HL/M295,557SAF7849HL_M295
Always Pb-free

Quality and reliability disclaimer

Pricing/ordering/availability

Type numberOrdering code(12NC)Orderable part numberIndicative price/unit($)RegionDistributorIn stockOrder quantityInventory dateBuy onlineSamples
SAF7843HL/M2959352 881 55557  SAF7843HL/M295,557        not available
SAF7849HL/M2459352 883 28557  SAF7849HL/M245,557        not available
SAF7849HL/M2959352 879 32557  SAF7849HL/M295,557  ASIAWPI3,00030011/19/2009Buy onlinenot available

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

Type numberPackageApplicationFUNCTIONOperating
temp.(Cel)
No. of PinsCircuit TypeOperating/Supply Voltage (MAX.-Vcc,Vp,VDD)(V)
SAF7843HL/M295SOT486-1
(LQFP144)
Car Radio, Audio and CD, MP3, WMA SystemsGeneric ROM masking for aftersales-40 ~85144Compact Disc3.6
SAF7849HL/M245SOT486-1
(LQFP144)
Car Radio, Audio and CD, MP3 SystemsGeneric ROM masking aftersales-40~85144Compact Disc3.6
SAF7849HL/M295SOT486-1
(LQFP144)
Car Radio, Audio and CD, MP3, WMA SystemsGeneric ROM masking OEM PPAP-40~85144Compact Disc3.6