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MAX9670 Evaluation Kit
Figure 4. Example of a Simple SMBusReadByte Operation Using the Advanced User Interface
Address Selection
Jumper JU1 sets the MAX9670 slave address. The
default address is 1001 011(R/ W ) (DEV_ADDR = VDD).
See Table 1 for a complete list of addresses.
Audio Encoder Inputs
Connect a stereo audio source that represents the
encoder audio to P4 (left audio) and P5 (right audio).
The Cirrus CS4334/5/8/9 and Burr-Brown PCM1742 are
commonly used in set-top boxes to convert a digital I 2 S
audio stream to analog-stereo audio signals. The full-
scale audio level of the CS4334 is 1.2V RMS , while the
full-scale audio level of the PCM1742 is 1.1V RMS . Both
parts center their audio outputs in the middle of their
analog supply voltage range.
The ENC_INL and ENC_INR inputs expect the incoming
audio signal to have a full scale of 0.5V RMS and to be
centered around ground. Therefore, the audio signals
presented to P4 and P5 are AC-coupled and attenuat-
ed by a resistor-divider network. The amount of attenua-
tion is determined by jumpers JU2 and JU3. If the shunt
position is 1-2, the resistor-divider network attenuates a
1.2V RMS full-scale audio signal to a 0.5V RMS full-scale
audio signal. If the shunt position is 2-3, the resistor-
divider network attenuates a 1.1V RMS full-scale audio
signal to a 0.5V RMS full-scale audio signal.
If the audio source does not have either a 1.2V RMS or
1.1V RMS full-scale signal, then the resistor-divider net-
work can be adjusted to accommodate another full-
scale audio level. For example, if the incoming audio
signal is 2V RMS full-scale, then the signal must be
attenuated by a factor of 4. Set the shunt positions of
JU2 and JU3 to 1-2. Change resistors R57 and R59
from a 4.53k Ω resistor to a 2.2k Ω resistor.
8
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