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TLV320ADC6140: requirements check

Henry Wang3
Genius 3345 points
Part Number: TLV320ADC6140

Tool/software:

Hi Sir,

My customer is seeking an Audio ADC device that meets the following requirements.

Could you please help confirm whether the TLV320ADC6140 is recommended, or if TI has a more recent solution? Thank you.

Function request: 

1. The maximum input signal is 24dbu.
2. At 0dbu, the signal-to-noise ratio must be greater than 75dB.

  • 0
    TI__Intellectual 2435 points

    Hi Henry,

    Any of our audio ADCs will be able to achieve this noise level, however I am not aware of any that can tolerate this input level. The TLV320ADC6140 has a differential full-scale input of only 2-Vrms.

    The PCM6xx0-Q1 family can support 10-Vrms full-scale differential inputs (22.22dBu), which still does not meet your requirement, but is quite close.

    Best,

    Garret

  • 0 in reply to Garret Godfrey
    Prodigy 70 points

    电路设计上会按照24dbu的信号输入，进过运放缩小到2-Vrms，对于输入信号0dub换算到adc输入为126mv

    相当于要评估输入信号126mv的时候，我们的TLV320ADC6140理论信噪比和THD能否满足我们的需求。

  • 0 in reply to jie zhou
    TI__Intellectual 2435 points

    For a -24dB input, the datasheet SNR values will be decreased by 24dB. This should remain above 75dB for all cases with a 1kHz input. However, the datasheet specs are only measured at this frequency, so we cannot say for sure whether the SNR will maintain this value at 20Hz or 20kHz.

    Best,

    Garret

  • 0 in reply to Garret Godfrey
    Prodigy 70 points

    对于这个表格我们应该怎么理解看起来开启DRE功能信噪比会更好，这个模块是把输入信号衰减后再放大吗？对于我们的应用开启DRE看起来会改变输出的实际值。

    您们能否在评估版帮忙验证一下输入在126mv的情况下TLV320ADC6140信噪比测试出来是多少，我们可以根据测试数据来评估余量是否能满足我们的需求。

    我们看到官网上采购评估版周期比较长，我们要尽快验证，看起来时间比较紧，您们能否帮助在您们的评估版上测试一下

  • 0 in reply to jie zhou
    TI__Mastermind 46555 points

    Hi Jie,

    Today is a U.S. holiday. Please be patient as our team follows up with you tomorrow.

    Thank you!
    Jeff McPherson

  • 0 in reply to Jeff McPherson
    TI__Intellectual 2435 points

    Hi Jie,

    For a 126mVp signal, I measured an SNR of around 83-85dB with DRE disabled. Enabling the DRE will improve this by 6-10dB.

    Best,

    Garret