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TLV320AIC3120: TLV320AIC3120 as alternate for TLV320DAC3120

Shinu.V.Mathew
Genius 11560 points
Part Number: TLV320AIC3120
Other Parts Discussed in Thread: TLV320DAC3120,

Hi Team,

One of our customer is currently using TLV320DAC3120, due to shortage they want to replace it with TLV320AIC3120 (recommended in http://www.ti.com/product/TLV320DAC3120/description), which has ADC channel additionally. What will be pros and cons if the part is replaced with TLV320AIC3120, customer want to replace the part without any change in software and having below queries.

 

1) By Default, after reset the Page0/Register81(ADC Digital Mic) D7 has 0 (ADC channel is powered down). Does this requires any change to disable ADC completely ?

 

2) By default, P0/R18 & P0/R19(ADC NDAC_VAL & ADC MDAC_VAL) D7 has 0 (powered down) and ADC_DSP_CLK = DAC_DSP_CLK & ADC_MOD_CLK = DAC_MOD_CLK respectively. If am not wrong ADC clock is driven by DAC CLK. Does this starts sampling the analogue input signal after reset ?

 

3) By default, P0/R61 (ADC Processing Block/ miniDSP Selection ) has D4-D0 as 00100 (ADC signal-processing block PRB_R5). Does this requires any change ?

 

4) Page 0 / Register 53 DOUT (OUT Pin) Control. This pin is hanging and by default, has D3-D1 as 001 (DOUT = primary DOUT output for codec interface). Does this required to be disabled ?

 

The aim is to replace the part without any software change. Please help with your comments.

Regards, Shinu Mathew.

  • 0
    TI__Mastermind 30220 points
    Shinu,

    1: The ADC is powered down by default. There is not change required to disable the ADC completely. The PGAs and input mixers are powered down by default also.
    2: yes, NADC and MADC are powered down default. the ADC may be driven by DAC_MOD_CLK but if the ADC is powered down, there is no sampling taking place.
    3: this should not require any change. especially if the ADC is powered down.
    4: no, there is no need to disable this.

    These devices are part of the same family, and because of this, there shouldn't be changes required. The Linux driver that was designed for the TLV320AIC3120 also works with the TLV320DAC3120.

    best regards,
  • 0 in reply to Steve-Wilson
    TI__Genius 11560 points
    Hi Steve,

    Thanks a lot for your support and quick response.

    Regards,
    Shinu Mathew.
  • 0 in reply to Shinu.V.Mathew
    TI__Genius 11560 points
    Hi Steve,

    Please confirm my understanding on your reply mail.

    There is no need to change existing SW as ADC section is powered down by default
    There is no need to change existing Layout (ADC pins can be left open) as ADC section is powered down by default


    Note: In Existing design, following DAC IC IO pins (4, 11, 12, 13, 14, 15 & 30) are left open.

    Thanks in advance for your help and support.

    Regards, Shinu Mathew.
  • 0 in reply to Shinu.V.Mathew
    TI__Mastermind 30220 points
    Shinu,

    With the ADC and PGA blocks powered down, this is acceptable.

    When customers use the ADC, all unused inputs we recommend connect to GND via 0.47uf cap to prevent unwanted noise coupling into the ADC. But if the ADC is never used this is not an issue.

    best regards,
    -Steve Wilson