Revision a Errata

ERRATA SHEET

MAX9850

Stereo Audio DAC with

DirectDrive Headphone Amplifier

www.maxim-ic.com

The errata listed below describe situations where the MAX9850 components perform differently than expected or dif- ferently than described in the data sheet (this Errata corresponds to Rev 1 of the MAX9850 data sheet). This errata sheet applies to all MAX9850 devices until further notice.

Description:

The MAX9850 data sheet states that the digital audio interface can operate in I2S mode in addition to left/right justified. After careful observation of actual part operation, it was found that data formatted using the I2S standard cannot be properly decoded by the MAX9850.

I2S is a "catch-all" term used to generically describe many digital audio interfaces. In reality, I2S is one of many digital audio formats that can be used to send digital audio data to a decoder. I2S is very similar to a mode Maxim calls "Left Justified." See Figures 1 and 2.

Figure 1 shows digital audio data left justified. This audio format is identified by the MSB of the data word on SDIN coinciding with the first BCLK transition after LRCLK changes state. Figure 1 shows left- and right-channel data both with the SDIN MSB being clocked in on the first BCLK rising edge after the LRCLK transition.

	MASTER MODE: S_WCI = 0, S_BCI = 0, S_DLY = 0, S_WS = 0
LRCLK(OUT)								LEFT																	RIGHT
SDIN	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
BCLK(OUT)
SDOUT	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	15
						LEFT DATA SAMPLE																RIGHT DATA SAMPLE

Figure 1. Left-Justified Audio Data

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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.