sm5950b Seiko NPC Corp., sm5950b Datasheet
sm5950b
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sm5950b 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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... Output data operation Conversion rate detector Filter type selector Output timing operation IISO OMOD0 OMOD1 THROU SLAVE DMUTE SM5950BM LRCI BCKI DI Input data interface Arithmetic operation block Interpolation filter operation Deemphasis filter operation Output operation Output data interface Though, mute, and ...
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... Output system clock input (512fso) 21 SLAVE I Slave select pin 22 DOUT O Data output 23 BCKO I/O Bit clock input/output (64fso) 24 LRCO I/O Sample rate clock input/output (fso) SM5950BM Description SEIKO NPC CORPORATION —4 HIGH LOW – – – – – – Test Normal – Reset – – ...
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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 Rating Unit − ...
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... Parameter Symbol Clock pulse cycle time Clock pulsewidth (HIGH level) t Clock pulsewidth (LOW level) Clock pulse duty SCKO t CWH Reset input (RSTN) Parameter Symbol RSTN pulsewidth RSTN t RST SM5950BM Condition t CY CWH t CWL t CWL t CY Condition t RST Rating Unit min typ max 39 ...
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... LRCI cycle time BCKI pulse cycle time BCKI pulsewidth (HIGH level) t BICWH BCKI pulsewidth (LOW level) t BICWL DI setup time DI hold time Last BCKI rising edge to LRCI edge LRCI edge to first BCKI rising edge LRCI BCKI DI SM5950BM Condition t LICY t BICY t DIS t DIH t BLI t LBI t ...
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... LRCO cycle time BCKO pulse cycle time BCKO pulsewidth (HIGH level) t BCKO pulsewidth (LOW level) t Last BCKO rising edge to LRCO edge LRCO edge to first BCKO rising edge DOUT output delay LRCO BCKO DOUT SM5950BM Condition t LOCY t BOCY BOCWH BOCWL t BLO t LBO ...
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... BCKO pulsewidth (HIGH level) t BCKO pulsewidth (LOW level) t BCKO output delay LRCO output delay DOUT output delay t = output system clock (SCKO input) cycle time CY SCKO t BODL LRCO BCKO DOUT SM5950BM Condition t LOCY LOCWH LOCWL t BOCY BOCWH BOCWL 15pF BODL ...
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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 0.1 SM5950BM S/N ratio 20-bit input – 94.0dB – 96.2dB – 96.2dB 48 to 24kHz 48 to 22.05kHz 48 to 32kHz 0.2 0.3 Frequency [× fsi] Figure 1. Anti-aliasing filter characteristics 24-bit input – 94.0dB – ...
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... Deemphasis filter characteristics 0.0 -2.0 -4.0 -6.0 -8.0 -10.0 -12.0 10 Figure 2. Deemphasis filter frequency characteristics 0 -10 -20 -30 -40 -50 -60 -70 -80 -90 10 Figure 3. Deemphasis filter phase characteristics SM5950BM fsi 44.1kHz 44.1kHz 48.0kHz 32.0kHz 100 1000 Frequency [Hz] 100 1000 Frequency [Hz] 44.1kHz 48kHz 32kHz 10000 100000 32kHz 44.1kHz 48kHz 10000 100000 SEIKO NPC CORPORATION —14 ...
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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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... SLAVE TMOD0 TMOD1 SM5950BM FSYNC SCK SDATA Co/F0 5V SEL CS12/FCK MCU External Clock 6.144MHz (128fso) Level Shifter (3.3V to 5V) LRCI BCKI DI DEEM SM5950BM IMOD0 IMOD1 IISI TMOD0 TMOD1 FS0 FS1 MCK FSYNC SCK SDATA 5V DIT M2 CS8402A M1 M0 SEIKO NPC CORPORATION —18 ...
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... Connection to MOST Interface Transceiver (OS8104) SCKO SM5950BM SM5950BM 24.576MHz (512fso) LRCO BCKO DOUT 5V OMOD0 OMOD1 IISO 5V THROU SLAVE TMOD0 TMOD1 RMCK FSY SCK-SRC_FL SR0-D3 /RD MOST /WR OS8104 PAR_CP PAR_SRC ASYNC PAD0 PAD1 SEIKO NPC CORPORATION —19 ...
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... 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 Voltage max. 5.5V Input Pin Circuit − TYPE2 Pin name (Number): FS1 (12), DMUTE (13), OMOD1 (16), OMOD0 (17), IISO (18) Input Voltage max. 5.5V SM5950BM V : 3.3V DD 350Ω 3.3V DD 350Ω SEIKO NPC CORPORATION —20 ...
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... Output Pin Circuit Pin name (Number): DOUT (22) Input/Output Pin Circuit Pin name (Number): BCKO (23), LRCO (24) Input Voltage max. 5.5V SM5950BM V : 3.3V DD 350Ω 3.3V DD 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, ...