SM5950BM NPC, SM5950BM Datasheet
SM5950BM
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SM5950BM Summary of contents
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... OVERVIEW The SM5950BM is a digital audio signal asynchronous sample rate converter LSI. It supports 16/20/24-bit word-length input/output interface data. It also features a built-in digital deemphasis filter and direct mute functions. FEATURES Functions L/R 2-channel (stereo) processing I Input sample rate range: 20kHz to 100kHz I Output sample rate range: 30kHz to 50kHz ...
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... Applications Digital audio equipment-interface sample rate con- I version (AV amplifier, CD-R/RW, DAT, MD, DVC) Recording/editing equipment sample rate conver- I sion SM5950BM Converter Performance Internal data word length: 20 bits I Deemphasis filter characteristics (IIR filter) I • ± 0.03dB gain deviation from ideal filter char- acteristic ...
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... BLOCK DIAGRAM SCKO RSTN IISO OMOD0 OMOD1 THROU SLAVE DMUTE SM5950BM LRCI BCKI Sequencer block Interpolation operation Output data operation Conversion rate detector Filter type selector Output timing operation LRCO BCKO DOUT DI IMOD0 Input data interface IMOD1 IISI Arithmetic operation block ...
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... OMOD0 18 IISO 19 VSS 20 SCKO 21 SLAVE 22 DOUT 23 BCKO 24 LRCO SM5950BM I/O Description I Sample rate clock input (fsi) I Bit clock input (32fsi to 64fsi) I Data input I IC test mode select pin (must be LOW for normal operation) I Reset pin – VDD supply (3.3V) I IIS input select pin ...
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... VDD level. In output mode, the output voltage must not be set, using external pull-up or other means, to voltages greater than VDD level forbidden to add more voltage than VDD to output mode bidirectional pins. SM5950BM DD Symbol Rating − ...
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... AC Electrical Characteristics Output system clock (SCKO input) Parameter Clock pulse cycle time Clock pulsewidth (HIGH level) Clock pulsewidth (LOW level) Clock pulse duty SCKO Reset input (RSTN) Parameter RSTN pulsewidth RSTN SM5950BM Symbol Condition CWH t CWL t t CWH CWL ...
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... Parameter LRCI cycle time BCKI pulse cycle time BCKI pulsewidth (HIGH level) BCKI pulsewidth (LOW level) DI setup time DI hold time Last BCKI rising edge to LRCI edge LRCI edge to first BCKI rising edge LRCI BCKI DI SM5950BM Symbol Condition t LICY t BICY t BICWH t BICWL t ...
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... Parameter LRCO cycle time BCKO pulse cycle time BCKO pulsewidth (HIGH level) BCKO pulsewidth (LOW level) Last BCKO rising edge to LRCO edge LRCO edge to first BCKO rising edge DOUT output delay LRCO BCKO DOUT SM5950BM Symbol Condition t LOCY t BOCY t BOCWH t BOCWL ...
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... LRCO pulsewidth (LOW level) BCKO pulse cycle time BCKO pulsewidth (HIGH level) BCKO pulsewidth (LOW level) BCKO output delay LRCO output delay DOUT output delay t = output system clock (SCKO input) cycle time CY SCKO LRCO BCKO DOUT SM5950BM Symbol Condition t LOCY t LOCWH t LOCWL t BOCY t BOCWH t ...
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... The timing for each output format is shown in figures 9 to 13. In slave mode, the input timing of LRCO and BCKO for each output format is shown in figures 9 to 13. In through mode, the LRCI, BCKI, and DI inputs are fed through to the outputs regardless of the output data format settings. SM5950BM IISI Format L 16-bit MSB-fi ...
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... System Reset (RSTN) The SM5950BM must be reset if any of the following conditions occur during normal operation. A reset pulse is a LOW-level pulse applied to RSTN, although the reset operation actually occurs on the rising edge of the LOW-level pulse. When the power supply is applied I A reset (RSTN = LOW to HIGH) is required when the power supply voltage is applied and after the LRCI, BCKI, SCKO (and LRCO, BCKO if in slave mode) clocks have stabilized ...
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... Actual sample rate conversion ratio is higher than the selected filter conversion ratio. If the fs conversion ratio is not fixed, the conversion will slowly follow the change in ratio, but in the process the possibility exists that noise may occur in the audio data output. SM5950BM Conversion frequency Selects range (example) ≥ ...
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... Anti-aliasing filter characteristics 0 -20 -40 -60 -80 -100 -120 0 SM5950BM 20-bit output: – 122dB 24-bit output: – 146dB S/N ratio 16-bit input 20-bit input – 92.5dB – 94.0dB – 93.9dB – 96.2dB – 93.9dB – 96.2dB 48 to 24kHz 48 to 22.05kHz 48 to 32kHz 0 ...
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... FS0 Deemphasis filter characteristics 0.0 -2.0 -4.0 -6.0 -8.0 -10.0 -12 -10 -20 -30 -40 -50 -60 -70 -80 -90 10 SM5950BM Deemphasis OFF ON FS1 fsi L 44.1kHz L 44.1kHz H 48.0kHz H 32.0kHz 100 1000 Frequency [Hz] Figure 2. Deemphasis filter frequency characteristics 100 1000 Frequency [Hz] Figure 3. Deemphasis filter phase characteristics 44.1kHz 48kHz 32kHz 10000 ...
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... The conversion rate detector stage requires a certain amount of time to calculate the sample rate conversion ratio with accuracy. The minimum response time, after the SM5950BM input sampling frequency (fsi: LRCI input) and output sampling frequency (fso: derived from SCKO) have stabilized sufficiently, is the time required to determine the sample rate conversion ratio to 16-bit accuracy after reset is cleared, and is given by: Response time = 16384/fso (371ms at fso = 44 ...
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... Figure 7. MSB-first left-justified, leading 16 data bits only are valid (IMOD0 = H, IMOD1 = H, IISI = L), BCKI = 32fsi to 64fsi LRCI (fsi) BCKI (64fsi Figure 8. IIS, leading 16 data bits only are valid (IMOD0 = H, IMOD1 = H, IISI = H), BCKI = 64fsi only SM5950BM Lch ...
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... Figure 12. MSB-first left-justified, 16-bit output (OMOD0 = H, OMOD1 = H, IISO = L), BCKO = 64fso only LRCO (fso) BCKO (64fso) DOUT Figure 13. IIS, 16-bit output (OMOD0 = H, OMOD1 = H, IISO = H), BCKO = 64fso only SM5950BM Lch ...
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... MCU External Clock 24.576MHz (512fso) LRCO Level Shifter BCKO (3.3V to 5V) DOUT OMOD0 OMOD1 IISO THROU SLAVE TMOD0 TMOD1 LRCI BCKI DI DEEM SM5950BM IMOD0 IMOD1 IISI TMOD0 TMOD1 FS0 FS1 6.144MHz (128fso) MCK FSYNC SCK SDATA 5V DIT M2 CS8402A M1 M0 SEIKO NPC CORPORATION —18 ...
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... Connection to MOST Interface Transceiver (OS8104) SM5950BM SM5950BM 24.576MHz (512fso) SCKO LRCO BCKO DOUT OMOD0 OMOD1 IISO 5V THROU SLAVE TMOD0 TMOD1 RMCK FSY SCK-SRC_FL SR0-D3 5V /RD MOST /WR OS8104 PAR_CP PAR_SRC ASYNC PAD0 PAD1 SEIKO NPC CORPORATION —19 ...
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... INPUT/OUTPUT PIN EQUIVALENT CIRCUITS Input Pin Circuit − TYPE1 Pin name (Number): LRCI (1), BCKI (2), DI (3), TMOD0 (4), RSTN (5), IISI (7), IMOD0 (8), IMOD1 (9), DEEM (10), FS0 (11), TMOD1 (15), SCKO (20), SLAVE (21) Input Pin Circuit − TYPE2 Pin name (Number): FS1 (12), DMUTE (13), OMOD1 (16), OMOD0 (17), IISO (18) SM5950BM Input V : 3.3V DD Voltage max ...
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... Output Pin Circuit Pin name (Number): DOUT (22) Input/Output Pin Circuit Pin name (Number): BCKO (23), LRCO (24) SM5950BM V : 3.3V DD 350Ω Input V : 3.3V DD Voltage max. 5.5V 350Ω SEIKO NPC CORPORATION —21 ...
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... Customers are requested not to export or re-export, directly or indirectly, the Products to any country or any entity not in compliance with or in violation of the national export administration laws, treaties, orders and regulations. Customers are requested appropriately take steps to obtain required permissions or approvals from appropriate government agencies. SM5950BM SEIKO NPC CORPORATION 15-6, Nihombashi-kabutocho, Chuo-ku, ...