aP89 FAQ

  • What's the making process of “ APLUS aP89 serial OTP “ ?
    There are three steps : Editing, Compiling and Programming.
  • What kind of voice file format should be sent to Aplus ?
    We accept mp3、wav、aif、wma、avi、mpeg.
  • What kind of voice format can be accepted by aP89 serial OTP ?
    It accepts MONO、8BIT、WAV or VOC.
  • How to program OTP Voice Chips (aP89 Series OTP) ?
  • Why it appears “ Too Many Voice File “ even we follow “ MONO、8BIT、WAV “ ?
    There are two possibility one is “ your total voice length is too long”. The another is “you didn’t use our suggest editing software. “ Usually we suggest use SOUND FORGE、GOLD WAVE、COOL EDIT .
  • Why some “ Hiss Hiss “ noise produced from the IC ?
    There will be a little distorted when the voices transfer to our acceptable format. So, we need some editing software to modify the voices to improve the quality. Raising sample rate or using PCM compression will be helpful. If you any further voice quality the request, pls contact our editing engineer edit@aplusinc.com.tw
  • Why the playing speed of the IC is not correct often ( too fast or too slow ) ?
    Please reter to "Rosc Table" colum of each OTP item.
  • Can I mix different sample rates in the same one aP89 series IC ?
    No ! Every Rosc value is corresponded to one single sample rate to adjust its speed.
  • When I do the compiling, can I mix PCM & ADPCM in one project ?
    Yes ! You can use PCM compression in some bad quality voice files, but please note it’ll occupy more memory, so you must calculate a right sample rate at first.
  • If I compile the voice output is VOUT ( PWM ), can I use COUT ( DAC ) for Instead ?
    No ! Because their RAMP UP & RAMP DOWN are different, if you do not use your compiling output in your application , it may produce “ Po “ noise before or after you play the voices.
  • If I compile the voice output is COUT ( DAC ), can I use VOUT ( PWM ) for Instead ?
    No ! Because their RAMP UP & RAMP DOWN are different, if you do not use your compiling output in your application , it may produce “ Po “ noise before or after you play the voices.
  • When we use “ DAC “ to drive speaker, the 8050 transistor will heat. Is it normal ?
    Because 8050 transistor belongs to A type amplifier, its high temperature is normal.To avoid this situation happened, we suggest you use APLUS “ AP4890B “ audio power amplifier to improve it.
  • If the power circumstance is not good in my circuits, will it affect the voice quality ?
    If there are any noise existing in the power supply, these noises will be easy through the IC power supply transmit to affect the voice quality. We suggest “serial connection” 47Ω resistor in front of the ic vdd and connect a capacitor between vdd and vss. Becouse of the different circumstances the value of capacitors will be not fixed , but you can try 10uF at first.
  • What's the operating current when the aP89 serial OTP is playing ?
    The operating current of the IC itself is about 10mA, if you use” PWM “ to drive speaker directly, the total current will be about 50 ~ 70mA. If you use “ COUT “ add transistor to drive speaker, the total current will be from 120mA to 250mA depends on what speakers & transistors you use.
  • What's the operating current when we finish playing ?
    IC will automatically enter sleep mode after finish playing. So its operating current will be less than 1-5uA.
  • What's the sample rate in APLUS aP89 serial OTP ?
    All are based on 4bit 6KHz sample rate. It means if you run out all the length, the best sample rate is 4bit 6KHz.
  • What sample rate will have better result ?
    It depends on your original voices . General speaking, high sample rate has better effect. But, some special voices they need low sample rate instead.
  • What's the max. sample rate can be reached ?
    We suggest 22KHz sample rate is the highest one in every project. If over 25KHz, the IC frequency will be easily unstable.
  • What's the min. sample rate that can be accepted ?
    According to our experience, 8KHz sample rate will be accepted by 70% of customers.
  • Can we use MIDI or Melody format in APLUS aP89 serial OTP ?
    No. But, we can utilize software to transfer MIDI or MELODY to WAV or VOC format then we can program them into our OTP.
  • There are aP89010, aP89021, aP89042 and aP8910A, aP8921A, aP8942A in APLUS aP89series OTP IC. What's the difference between with A & none A ?
    The working voltage of the 3 bodies with A can reach 5V, but the three none A can reach 3.6V only.
  • What kind of speaker is suitable in APLUS aP89 serial OTP ?
    We use 8Ohm, 0.25W speaker generally.