MAX9850 Errata Sheet, I2S-Formatted Digital Audio Data

MAX9850 ERRATA SHEET

	MASTER MODE: S_WCI = 0, S_BCI = 0, S_DLY = 0, S_WS = 0
LRCLK(OUT)							LEFT																	RIGHT
SDIN	0	15	14	13	12	11	10	9	8	7	6	5	4	3	2	1	0	15	14	13	12	11	10	9	8	7	6	5	4		3	2	1
							LEFT DATA SAMPLE																RIGHT DATA SAMPLE
BCLK(OUT)
SDOUT	0	15	14	13	12	11	10	9	8	7	6	5	4	3	2	1	0	15	14	13	12	11	10	9	8	7	6	5	4	3	2	1	0
							LEFT DATA SAMPLE																RIGHT DATA SAMPLE

Figure 2. I2S-Formatted Digital Audio Data

Figure 2 shows digital audio data formatted using the I2S standard. I2S-formatted digital audio is identified by the MSB of the data word clocked into the decoder on the second BCLK pulse following an LRCLK transition. Figure 2 shows two channels of audio data being clocked into the decoder. Both channels have the MSB delayed by one BCLK cycle.

This delay is the main difference between I2S and left-justified digital audio formats.

Work Around:

Left-justified audio mode must be used instead of I2S mode.

Most µP/µC/DSPs have a register(s) that controls how the digital audio data is formatted. The formats may not use the same naming convention as similar parts, but figures showing the data timing or frame format can be used to determine which mode needs to be used for proper MAX9850 operation.

For example, the Freescale SCF5250 microprocessor uses a digital audio interface that can operate in two modes. They call these modes IIS (I2S) mode and Sony EIAJ mode (left justified).

The user’s manual for the part can be found here http://www.freescale.com/files/platforms/doc/user_guide/SCF5250_USERS_MANUAL.pdf

Page 17-5 details the three digital audio interface registers. Tables 17-4 to 17-7 detail the configuration registers and bit descriptions.

The bit named MODE (bit 5) allows the user to toggle between the two modes.

Figure 17-2 on page 17-10 is a graphical representation of the two modes (IIS and EIAJ). This figure can be used to compare the format to the MAX9850 data sheet to see that EIAJ mode (from the Freescale data sheet) and left- justified mode (from the MAX9850 data sheet) are the same.

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MAX9850 specifications

The Maxim MAX9850 is a cutting-edge audio amplifier that is designed to deliver high-quality audio performance in portable devices. It is particularly popular in mobile applications such as smartphones, tablets, and handheld gaming consoles owing to its compact size and efficiency. This class D audio amplifier stands out for its ability to produce professional-grade sound quality while maintaining a low power consumption profile, making it an essential component for modern mobile audio systems.

One of the standout features of the MAX9850 is its ability to deliver up to 2.5W of output power into an 8-ohm load. This powerful output ensures that audio playback is loud and clear, with minimal distortion. The device operates with a supply voltage range from 2.5V to 5.5V, making it versatile enough to be used in a wide variety of mobile applications.

Another key technology employed in the MAX9850 is its integrated active feedback system. This innovation helps to reduce the total harmonic distortion (THD) to as low as 0.1%, ensuring that the audio quality remains pure and faithful to the original recording. This level of fidelity is particularly important for audiophiles and those who value high-quality sound in their devices.

The MAX9850 also features a built-in thermal shutdown and short-circuit protection, enhancing the reliability of the amplifier in numerous applications. This protection mechanism safeguards the device from potential damage due to overheating or electrical faults, extending the lifespan of the amplifier.

In terms of connectivity, the MAX9850 offers a simple interface with a mono output, making it easy to integrate into existing designs. Its compact size (available in a small 16-pin lead-free TQFN package) allows for flexible placement on circuit boards, catering to the space constraints often faced in portable electronics.

Additionally, the MAX9850 comes with a chip enable feature that allows it to be powered down to conserve battery life when not in use. This is particularly useful for battery-operated devices, ensuring optimal efficiency and prolonged usage time.

With its high output power, superb audio quality, protection features, and low power consumption, the Maxim MAX9850 is a remarkable audio amplifier that meets the demands of modern portable devices, making it a popular choice among designers and manufacturers in the audio sector.