Hi,
unfortunately the thread on the 7498 boards has been closed after I asked my question. Thus, I try to ask my question again, seperately. I hope the question is not too trivial but I could not find any answers.
I received the black board of the 7498E, a few days ago. looks good, but I couldn't try it out yet.
At the moment I try to understand the mute/standby function. Unfortunately, the datasheet of the 7498E doesn't say much about it. However, the datasheet of the 7498 includes more details, e.g., that the input current of STBY & MUTE should be less than 200µA. Is it ok to assume that both work similar in this context?
The standby and mute circuits of both datasheets (E and non-E) look very similar, but the circuit for the 7498E includes an additional resistor R19 with 33k. I don't understand why it is needed. Can somebody help? Is R4 >> than R2 to ensure that the chip is first enabled and then unmuted if both PINs are set to high at the same time?
I found another standby/mute circuit in the datasheet of the TDA7293 (Figure 6) that needs only one connector. It uses two resistors and a diode to ensure that the mute is first set to low if both PINs are connected to ground. Would it be possible to use a similar circuit for the 7498E to be able to control standby and mute with only one input? E.g., by splitting R4 into 20k and 100k and shortening the 100k by a diode?
Best regards,
Crest
unfortunately the thread on the 7498 boards has been closed after I asked my question. Thus, I try to ask my question again, seperately. I hope the question is not too trivial but I could not find any answers.
I received the black board of the 7498E, a few days ago. looks good, but I couldn't try it out yet.
At the moment I try to understand the mute/standby function. Unfortunately, the datasheet of the 7498E doesn't say much about it. However, the datasheet of the 7498 includes more details, e.g., that the input current of STBY & MUTE should be less than 200µA. Is it ok to assume that both work similar in this context?
The standby and mute circuits of both datasheets (E and non-E) look very similar, but the circuit for the 7498E includes an additional resistor R19 with 33k. I don't understand why it is needed. Can somebody help? Is R4 >> than R2 to ensure that the chip is first enabled and then unmuted if both PINs are set to high at the same time?
I found another standby/mute circuit in the datasheet of the TDA7293 (Figure 6) that needs only one connector. It uses two resistors and a diode to ensure that the mute is first set to low if both PINs are connected to ground. Would it be possible to use a similar circuit for the 7498E to be able to control standby and mute with only one input? E.g., by splitting R4 into 20k and 100k and shortening the 100k by a diode?
Best regards,
Crest