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BU9255FS Dataheets PDF



Part Number BU9255FS
Manufacturers Rohm
Logo Rohm
Description KARAOKE echo IC
Datasheet BU9255FS DatasheetBU9255FS Datasheet (PDF)

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 • KARAOKE functions for portable stereo sets, mini component stereo sets, video CDs and DVDs, etc. Features • 1) Echo m.

  BU9255FS   BU9255FS


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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 • KARAOKE functions for portable stereo sets, mini component stereo sets, video CDs and DVDs, etc. Features • 1) Echo mixing ratio is adjustable with a DC voltage. 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 Pin descriptions • BU9253FS / BU9255FS Pin No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 BU9253AS / BU9253FS / BU9255FS 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 = 25°C) Parameter Applied voltage BU9253FS Power dissipation BU9253AS BU9255FS Operating temperature Storage temperature Input voltage Symbol VCC Pd Topr Topr Limits 7 500∗1 600∗2 500∗1 – 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 1°C over 25°C. ∗2 Reduced by 6.0mW for each increase in Ta of 1°C over 25°C. •Recommended operating conditions (Ta = 25°C) Parameter Power supply voltage Symbol VCC Min. 4.0 Typ. 5.0 Max. 5.5 Unit V 2 Multimedia ICs CC CLK BU9253AS / BU9253FS / BU9255FS I CC, = 25°C, V = 5.0V, f = 375kHz, f = 1kHz, V = - 10dBV, pin 2 = V •Electrical characteristics (Ta distortion = 400Hz ~ 30kHz filter, output noise voltage : 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 pin 15 = VCC, 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 IN1→OUT Through total gain IN2→OUT, pin2 = ground Delay side Through, pin2 = ground Delay, Rg = 1kΩ Through side Rg = 1kΩ, 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 100µ 0.012µ IN1 0.1µ 100p 10k 20k 8.2k IN2 4700p 2.2µ 1k 2.2µ 1k VCC 0.01µ 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 22µ 0.01µ 0.47µ 10k 3300p 4.7k 2.2µ 15k OUT 22k 0.01µ VCC Unit RESISTOR : [Ω] CAPACITOR: [F] Fig. 1 4 Multimedia ICs BU9253AS / BU9253FS / BU9255FS •Application example (for BU9253FS / BU9255FS) VCC 100µ + 0.012µ 20k IN 2.2µ 0.1µ MUTE 100p 39k 16 OSC 15 14 13 A/D 0.01µ 10k 20k 8.2k VCC 4700p 12 11 10 9 – + COUNTER SRAM MIX D/A + – 5 6 3300p 7 8 OUT 1 2 3 4 + 22µ 0.01µ 0.47µ 10k ECHO LEVEL 4.7k 15k 0.01µ + 2.2µ Unit RESISTOR : [Ω] 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) L→M→H), 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 BU925.


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