R2S15901SP Digital Delay IC for “Lip Sync” REJ03F0151-0100 Rev.1.0 Apr 28, 2005 Description R2S15901SP is a digital audio delay chip to synchronize the TV video and audio signals. Features • • • • CMOS Technology 2-Channel 24-bit Audio signals delay Delay time is controlled by DC voltage (9steps: 1, 7/8, 3/4, 5/8, 1/2, 3/8, 1/4, 1/8 times) 43K bytes RAM up to delay 224ms(@fs = 32kHz) When fs = 48kHz, maximum delay is 149ms. • 2 3-state pins for 9-step configuration • 3.3V signal input available Recommended Operating Condition Supply Voltage Range VDD = 2.5V (typ.) Circuit Current IDD = 1.0mA (typ.) Operation Temperature Topr= –20 to 75ºC Applications LCD TV, PDP, DVD Recorder, AV Amplifier Rev.1.0 Apr 28, 2005 page 1 of 7 R2S15901SP Block Diagram BCKI LRI SDI LRI BCKI L/R Serial Audio I/F Input RD WR RAM I/F Di Do SRAM Addr L/R Serial Audio I/F Output SDO COU NT 0 COU NT 1 Contol Input/Output Configuration The schematic diagrams of the input and output circuits of the logic section are shown below: VSS Input pin 1, 2, 3 Rev.1.0 Apr 28, 2005 page 2 of 7 VDD VDD VDD 31K H 31K L VSS Input Pin 5, 6 VSS Output Pin 7 R2S15901SP Pin Configuration SDI 1 8 VDD LRI 2 7 SDO BCKI 3 6 COUNT1 VSS 4 5 COUNT0 Pin Description Pin No. Pin Name I/O Description 1 SDI I • Serial audio data input • The input audio data are fetched at every LRI edge. 2 LRI I • • • • 3 BCKI I • Bit clock input • BCK clock is 64 times as large as LRI and input audio data. 4 VSS — • Ground 5 6 COUNT0 COUNT1 I • Delay time control 0 • Delay time control 1 • Delay time control pin. These two inputs are 3-state input pins that may be set high LR clock Audio sample frequency. Low indicates the audio input data SDI and output data SDO are left channel data. High indicates the audio input data SDI and output data SDO are right channel data. or low, or left unconnected to generate the third state. With the 3-state condition, 9step delay time may be organized. 7 SDO O • Audio data output • This SDO is the delayed audio data output. 8 VDD — • Power supply +2.5V Rev.1.0 Apr 28, 2005 page 3 of 7 R2S15901SP Function Description Serial Interface LRI BCK SDI, SDO 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 The input audio data format is I2S 24-bit 64fs as above with the same as output. Delay Time The R2S15901SP provides 9 steps time delay by using two control pin COUNT0 and COUNT1. The two control pins provide 3-state respectively to generate 9 steps time delay. COUNT0 and COUNT1 may be tied to high, low or left unconnected. Internal comparator circuitry monitor input state to determine the input is high, low or middle state. Internal Pull high and low resistor keep input at VDD/2. The comparator distinguishes terminal voltage level as below. L 0 M 0.7 1.0 H 1.5 1.7 2.5 Input voltage(V) Sampling Rate (fs) Max COUNT[1:0]=HH 7/8 COUNT[1:0]=HM 6/8 COUNT[1:0]=HL 5/8 COUNT[1:0]=MH 192kHz 96kHz 37ms 75ms 33ms 65ms 28ms 56ms 23ms 47ms 88.2kHz 48kHz 81ms 149ms 71ms 131ms 61ms 112ms 51ms 93ms 44.1kHz 32kHz 163ms 224ms 142ms 196ms 122ms 168ms 102ms 140ms (Sampling Counts) (7168) (6272) (5376) (4480) Sampling Rate (fs) 4/8 COUNT[1:0]=MM 3/8 COUNT[1:0]=ML 2/8 COUNT[1:0]=LH 1/8 COUNT[1:0]=LM 0 COUNT[1:0]=LL 192kHz 96kHz 19ms 37ms 14ms 28ms 9ms 19ms 5ms 9ms 0ms 0ms 88.2kHz 48kHz 41ms 75ms 30ms 56ms 20ms 37ms 10ms 19ms 0ms 0ms 44.1kHz 32kHz 81ms 112ms 61ms 84ms 41ms 56ms 20ms 28ms 0ms 0ms (Sampling Counts) (3584) (2688) (1792) (896) (0) The delay time is evaluated by the following formula: Delay Time = (1/fs) × (sampling counts + 1) sec Rev.1.0 Apr 28, 2005 page 4 of 7 R2S15901SP Mode Change The R2S15901SP samples COUNT0 and COUNT1 pins while LRI is low by BCKI. When COUNT0 and COUNT1 are sampled and changed, they are detected at low interval of LRI. The delay counts start from the following falling edge of LRI with SDO to be delayed by sample counts + 1. The SDO output is muted before the first new delay data being issued, when the new mode is recognized. An internal POR(Power On Reset) circuitry is to setup the initial mode right after power applied. Digital Audio Delay COUNT0, 1 Mode switch detect Sample counts + 1 LRI BCKI SDO 23 22 21 20 23 22 21 20 SDI 23 22 21 20 23 22 21 20 Mode change timing Absolute Maximum Ratings (Unless otherwise stated, VDD = 2.5V, VSS = 0V, Ta = 25°C) Parameter Symbol Ratings Unit Power supply voltage Input pin voltage VDD VI –0.3 to +2.75 –0.3 to 3.6 V V Power dissipation Operating temperature PD Topr 100 –20 to +75 mW °C Storage temperature Tstg –40 to +125 °C Rev.1.0 Apr 28, 2005 page 5 of 7 R2S15901SP Electrical Characteristics (Unless otherwise stated, VDD = 2.5V, VSS = 0V, Ta = 25°C) Parameter Operating VDD voltage Symbol VDD Min. 2.25 Typ. 2.5 Max. 2.75 Unit V Operating current Test Condition IDD — 1 — mA BCKI: 13MHz SDO: CL=25pF High level input voltage VIH 1.7 — 3.3 V LRI, SDI, BCKI Low level input voltage VIL — — 0.7 V LRI, SDI, BCKI Output high voltage VOH 1.85 — VDD V IOH = -2mA Output low voltage VOL 0 — 0.4 V IOL = 2mA Input high current IIH –10 — 10 µA VIN = VDD Input high current with 31kΩ pull down IIH(PD) 40 80 160 µA VIN = VDD COUNT0, COUNT1 Input low current IIL –10 10 µA Input low current with 31 kΩ pull up IIL(PU) –160 –80 –40 µA Input capacitance Input rise/fall transition time CIN Tr/Tf — — 10 — — 100 pF nS VIN = VSS VIN = VSS COUNT0, COUNT1 Serial Audio Timing Serial Audio Input Timing Parameters Parameter Min. Typ. Max. Unit fBCK tSIL — 35 — — 13 — MHz ns BCKI to LRI time tSIH tSLI 35 15 — — ns ns LRI to BCKI time Data Setup time tLSI tDS 15 15 — — — — ns ns Data Hold time Data output delay tDH tDOD 15 — — — — 15 ns ns tSIL tSLI BCKI frequency BCKI period L pulse width H pulse width Symbol LRI tSIH tLSI BCKI tDS SDI SDO tDOD Rev.1.0 Apr 28, 2005 page 6 of 7 tDH Test Condition SDO: CL = 25pF R2S15901SP Package Dimensions 8-Pin, SOP Package Rev.1.0 Apr 28, 2005 page 7 of 7 Body Size : 150mil Pin pitch : 1.27mm Sales Strategic Planning Div. Nippon Bldg., 2-6-2, Ohte-machi, Chiyoda-ku, Tokyo 100-0004, Japan Keep safety first in your circuit designs! 1. Renesas Technology Corp. puts the maximum effort into making semiconductor products better and more reliable, but there is always the possibility that trouble may occur with them. Trouble with semiconductors may lead to personal injury, fire or property damage. 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