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| Multimedia ICs KARAOKE echo IC BU9253AS / BU9253FS / BU9255FS The BU9253AS, BU9253FS and BU9255FS are single-chip ICs that contain all the components needed to configure a KARAOKE echo system: an A / D and D / A converter, SRAM, LPF, and mixer for mixing source signals. With these ICs, an echo function can be configured easily and with minimum external components. *Applications for portable stereo sets, mini comKARAOKE functions ponent stereo sets, video CDs and DVDs, etc. *Features ratio is adjustable with a DC voltage. 1) Echo mixing 2) A second order LPF can be configured with the internal amplifier and an attached capacitor and resistor. 3) Delay time of 131ms. (when fCLK = 357kHz) 4) Internal mute function. 5) Single power supply (5V). *Block diagram BU9253FS / BU9255FS 16 15 14 13 12 11 10 9 OSC VCC A/D COUNTER SRAM MIX D/A 1 2 3 4 5 6 +- +- 7 8 13 12 BU9253AS 18 17 16 15 14 11 10 OSC VCC A/D COUNTER SRAM MIX D/A 1 2 3 4 5 6 7 +- +- 8 9 1 Multimedia ICs BU9253AS / BU9253FS / BU9255FS *Pin descriptions BU9253FS / BU9255FS Pin No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 BU9253AS Function Pin No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 Pin name GND ECHO VR N.C. BIAS DAINT IN DAINT OUT DALPF IN Ground Echo level DC control Internally Analog DC bias DA integrator input DA integrator output DA LPF input Source sound and echo sound mixing output Mixing amplifier source sound input AD LPF input Function Pin name GND ECHO VR BIAS DAINT IN DAINT OUT DALPF IN DALPF OUT MIX OUT MIX IN ADLPF IN ADLPF OUT ADINT OUT ADINT IN VCC MUTE CR Ground Echo level DC control Analog DC bias DA integrator input DA integrator output DA LPF input DA LPF output Source sound and echo sound mixing output Mixing amplifier source sound input AD LPF input AD LPF output AD integrator output AD integrator input Vcc Mute control Oscillator output DALPF OUT DA LPF output MIX OUT MIX IN ADLPF IN ADLPF OUT AD LPF output ADINT OUT ADINT IN VCC N.C. MUTE CR AD integrator output AD integrator input Vcc Internally Mute control Oscillator output *Absolute maximum ratings (Ta = 25C) Parameter Applied voltage BU9253FS Power dissipation BU9253AS BU9255FS Operating temperature Storage temperature Input voltage Symbol VCC Pd Topr Topr Limits 7 5001 6002 5001 - 10 ~ + 70 - 55 ~ + 125 - 0.3 ~ VCC + 0.3 Unit V mW C C V VIN 1 Reduced by 5.0mW for each increase in Ta of 1C over 25C. 2 Reduced by 6.0mW for each increase in Ta of 1C over 25C. *Recommended operating conditions (Ta = 25C) Parameter Power supply voltage Symbol VCC Min. 4.0 Typ. 5.0 Max. 5.5 Unit V 2 Multimedia ICs BU9253AS / BU9253FS / BU9255FS VCC = = 375kHz, = 1kHz, VI = *Electrical characteristics (Ta = 25C, 400Hz 5.0V, fCLKfilter, outputfnoise voltage :- 10dBV, pin 2 = VCC, pin 15 = VCC, distortion = ~ 30kHz DIN-AUDIO) *Pin No. are for BU9253FS , BU9255FS and BU9253AS Parameter Current consumption Voltage gain 1 Voltage gain 2 Output distortion 1 Output distortion 2 Output noise voltage 1 Output noise voltage 2 Max. output voltage 1 Max. output voltage 2 Symbol ICC GV1 GV2 THD1 THD2 VNO1 VNO2 VOM1 VOM2 VH Min. -- - 5.6 -1 -- -- -- -- 1.4 1.4 3.8 1.6 0 -- Typ. 6 - 3.5 0 1.5 0.02 - 80 - 90 1.7 1.7 -- -- -- 375 Max. 12 - 1.4 1 3 0.1 - 60 - 80 -- -- 5.0 2.8 0.7 -- Unit mA dB dB % % dBV dBV Vrms Vrms V V V kHz No signal Conditions Delay total gain IN1OUT Through total gain IN2OUT, pin2 = ground Delay side Through, pin2 = ground Delay, Rg = 1k Through side Rg = 1k, pin2 = ground Delay, THD = 10% Through side, THD = 1% Pin 2 = ground H mode hold voltage, pin 15 DC M mode hold voltage, pin 15 DC L mode hold voltage, pin 15 DC Mute control VM VL Oscillation frequency fC 3 Multimedia ICs BU9253AS / BU9253FS / BU9255FS *Measurement circuit (for BU9253FS / BU9255FS) VCC 100 0.012 IN1 0.1 100p 10k 20k 8.2k IN2 4700p 2.2 1k 2.2 1k VCC 0.01 39k 16 15 14 13 12 11 10 9 OSC A/D - + COUNTER SRAM MIX D/A - + 5 6 7 8 1 2 3 4 22 0.01 0.47 10k 3300p 4.7k 2.2 15k OUT 22k 0.01 VCC Unit RESISTOR : [] CAPACITOR: [F] Fig. 1 4 Multimedia ICs BU9253AS / BU9253FS / BU9255FS *Application example (for BU9253FS / BU9255FS) VCC 100 + 0.012 20k IN 2.2 0.1 MUTE 100p 39k 16 OSC 15 14 13 A/D 0.01 10k 20k 8.2k VCC 4700p 12 11 10 9 - + COUNTER SRAM MIX D/A + - 5 6 3300p OUT 7 8 1 2 3 4 + 22 0.01 0.47 10k ECHO LEVEL 4.7k 15k 0.01 + 2.2 Unit RESISTOR : [] CAPACITOR: [F] Fig. 2 (1) Mute control functions Pin 15 voltage (pin 17) H M L Mode Unmuted (operating state) Muted Clock stop and muted * When switching between the muted and unmuted state (pin 15 (pin 17) LMH), the pin 15 (pin 17) M time should be longer than one SRAM cycle. This is to assure stability by initializing the SRAM before mode switching. Note: Figures in parentheses ( ) are for BU9253AS. (2) Differences between BU9253AS / FS and BU9255FS There is a difference regarding the signal stopping for muting. With BU9253AS / FS, the output from pin 8 (pin 9) is stopped during muting. With BU9255FS, the output from pin 5 is stopped during muting. 5 Multimedia ICs (3) Setting the echo loop gain BU9253AS / BU9253FS / BU9255FS VIN VIN OdB LPF VDLY AD SRAM DA 7 9 + 8 VO OUT R + R 2 R: R = 1: 1 mix Recommendable gain - 6dB VR Recommendable gain + 3dB Echo loop ATT VIN ~ VDLY***A = VDLY (A < 1) VIN With Pin NO. BU9253FS Fig. 3 With VOMax being the maximum amplitude of VO at this time (when the phases, including that of the DLY circuit, are in alignment): 1 VOMax. = (1 + A + A2 + ***) VIN = VIN AK * VIN = 1-A K=0 Thus, maximum allowable input is the value of VOMax provided the specifications (1 = A). Assuming a feedback ratio (A) of 0.7 and a maximum VOUT of 4.0 VP-P, VIN must be less than 1.2 VP-P. *External dimensions (Units: mm) BU9253FS / BU9255FS BU9253AS 6.6 0.2 16 6.2 0.3 4.4 0.2 9 18 10 6.5 0.3 0.15 0.1 0.51Min. 1 9 19.4 0.3 1.5 0.1 1 8 0.8 0.36 0.1 3.4 0.2 3.95 0.3 7.62 0.11 0.3Min. 0.15 0.3 0.1 1.778 0.5 0.1 0 ~ 15 SSOP-A16 SDIP18 6 |
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