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NJU26901 Dataheets PDF



Part Number NJU26901
Manufacturers JRC
Logo JRC
Description Digital Audio Delay
Datasheet NJU26901 DatasheetNJU26901 Datasheet (PDF)

NJU26901 Digital Audio Delay General Description Package The NJU26901 is a digital audio delay. The NJU26901 provides delay-time adjustment function and digital audio interface. FEATURES NJU26901M • 2-Channel Audio Delay (24 bits data width). Delay Time 85msec at fs = 48kHz ( 128msec at fs = 32kHz , 43msec at fs = 96kHz) • 4 delay time modes( ¼, ½, ¾, 1 max. delay ) are selectable without a micro-computer. • To make long delay time, the NJU26901 can be connected serially. • Non-audio-sign.

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NJU26901 Digital Audio Delay General Description Package The NJU26901 is a digital audio delay. The NJU26901 provides delay-time adjustment function and digital audio interface. FEATURES NJU26901M • 2-Channel Audio Delay (24 bits data width). Delay Time 85msec at fs = 48kHz ( 128msec at fs = 32kHz , 43msec at fs = 96kHz) • 4 delay time modes( ¼, ½, ¾, 1 max. delay ) are selectable without a micro-computer. • To make long delay time, the NJU26901 can be connected serially. • Non-audio-signal data can be delayed by the NJU26901. Hardware Specification • Digital Audio Interface • Digital Audio Format • Audio Bit Clock (BCK) Frequency • Package • Power Supply : 1 Input port / 1 Output port : I2S 24bit BCK : 64fs, Slave Mode : 13MHz Max ( approximate fs=200KHz) : DMP8 ( Pb-Free ) : 2.5V ( +3.3V input tolerant ) Function Block Diagram LRI BCKI SDI SERIAL AUDIO INTERFACE L/R in NJU26901 BCKI LRI Delay RAM SERIAL AUDIO INTERFACE L/R out Control Logic COUNT[1:0] Fig. 1 Function Block Diagram SDO Ver.2008-12-01 -1- NJU26901 Pin Assignment SDI 1 LRI 2 BCKI 3 VSS 4 NJU26901 8 VDD 7 SDO 6 COUNT[1] 5 COUNT[0] Pin Description Fig. 2 Pin Assignment Table 1 Pin Description Pin No. Symbol I/O 1 SDI I 2 LRI I 3 BCKI I 4 VSS - 5 COUNT[0] Ipu 6 COUNT[1] Ipu 7 SDO O 8 VDD - I : Input Ipu : Input(internal pull-up) O : Output Description Audio Data Input LR Clock Input Bit Clock Input GND Delay Time Control 0 Delay Time Control 1 Audio Data Output Power Supply +2.5V Absolute Maximum Ratings Table 2 Absolute Maximum Ratings Parameter Symbol Power Supply Voltage VDD Input Pin Voltage VTMI Power Dissipation Operating Temperature Storage Temperature PD TOPR TSTR Rating -0.3 to +3.05 -0.3 to +3.6 (VDD ≥ 2.25V) -0.3 to +3.05 (VDD < 2.25V) 100 -40 to +85 -40 to +125 Units V V mW °C °C -2- Ver.2008-12-01 NJU26901 Electric Characteristics Table 3 Electric Characteristics Parameter Symbol Operating VDD Voltage VDD Operating Current IDD Operating Temperature High Level Input Voltage Low Level Input Voltage TOPR VIH VIL High Level Output Voltage VOH Low Level Output Voltage Input Current Input Current Input Capacitance Input Rise/Fall transition Time VOL IIN IIN(PU) CIN tr / tf Test Condition BCKI:13MHz SDO:CL=25pF IOH= -2mA IOH= -100µA IOL= 2mA IOL= 100µA VIN= VSS to 3.6V VIN= VSS to 3.6V (VDD=2.5V,Ta=25°C) Min. Typ. Max. Units 2.25 2.5 2.75 V - 1.0 - mA -40 25 85 °C 2.0 - 3.3 V - - 0.5 V VDD-0.4 VDD-0.1 - - V - - 0.4 0.1 V -15 - +15 µA -100 - +15 µA - 10 - pF - - 100 ns Equivalent Circuit Input terminal VDD VSS Input terminal VDD VSS Output terminal VDD VSS Input Pin #1,2,3 Input Pin #5,6 Output Pin #7 Fig. 3 Input Terminal Equivalent Circuit Ver.2008-12-01 -3- NJU26901 Serial Audio Timing Table 4 Serial Audio Input Timing Parameters Parameter Symbol Test Condition BCKI Frequency BCKI Period L Pulse Width H Pulse Width BCKI to LRI Time fBCK tSIL tSIH TSLI LRI to BCKI Time tLSI Data Setup Time tDS Data Hold Time tDH Data Output Delay tDOD SDO=25pF Min Typ. Max Units - - 13 MHz 35 35 - ns 15 - - ns 15 - - ns 15 - - ns 15 - - ns - 15 ns LRI BCKI SDI tSIH tSIL tSLI tLSI tDS tDH SDO tDOD Fig. 4 Serial Audio Input / Output Timing -4- Ver.2008-12-01 NJU26901 Serial Audio Interface Digital Audio format is I2S 24bit 64fs in fig. 5. The input and output format are the same I2S 24bit 64fs. LRI BCKI SDI, SDO Left Channel Right Channel MSB LSB 23 2221 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 MSB LSB 23 22 21 20 19 18 17 16 15 14 13 12 1110 9 8 7 6 5 4 3 2 1 0 32 Clocks 32 Clocks Fig 5 Digital Audio Format (I2S 24bits 64fs) Function Description • SDI(#1) is serial audio input pin. The input audio data should be connected to this pin. The NJU26901 fetches in the input audio data every LRI edge. • LRI(#2) is LR clock input pin. This LR clock frequency is the same frequency of the input audio signal. LRI=”Low” shows SDI and SDO data are left channel data. LRI=”High” shows SDI and SDO data are right channel data. • BCKI(#3) is bit clock input pin. This BCKI clock frequency is 64 times as large as the input audio signal. • SDO(#7) is serial audio output pin. The delayed audio data come out through this pin. • VDD(#8) is 2.5V power supply pin. VSS(#4) is GND pin. The decoupling capacitor is necessary between VDD and VSS. • The input pins can interface to 3.3V ICs. The output pins can interface to 2.5V ICs. Refer to table3 “Electric Characteristics”. • After Power-on RESET, there is possibility the NJU26901 generates random data for the delay time period set by COUNT[0],[1] pins. If necessary, the mute circuit should be added. Delay Time • The NJU26901 provides maximum 4097 samples delay and slave-mode audio interface. The delay time depends on sampling frequency. • Delay time is controlled by COUNT[0], COUNT[1]. Table 5 shows Delay T.


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