Maxim MAX9850 User manual

Maxim
Brand
Maxim
Model
MAX9850
Type
User manual

Maxim MAX9850

The Maxim MAX9850 Stereo Audio DAC with DirectDrive Headphone Amplifier is a high-performance audio solution that offers exceptional sound quality and versatility. With its advanced features and ease of use, the MAX9850 is an ideal choice for a wide range of audio applications, including portable devices, home audio systems, and professional audio equipment.

Key Features:

  • Stereo audio DAC with 24-bit resolution and 192kHz sample rate
  • DirectDrive headphone amplifier with up to 130mW output power
  • I2S and left/right-justified digital audio interfaces
  • Flexible power management with low-power shutdown mode

Maxim MAX9850

The Maxim MAX9850 Stereo Audio DAC with DirectDrive Headphone Amplifier is a high-performance audio solution that offers exceptional sound quality and versatility. With its advanced features and ease of use, the MAX9850 is an ideal choice for a wide range of audio applications, including portable devices, home audio systems, and professional audio equipment.

Key Features:

  • Stereo audio DAC with 24-bit resolution and 192kHz sample rate
  • DirectDrive headphone amplifier with up to 130mW output power
  • I2S and left/right-justified digital audio interfaces
  • Flexible power management with low-power shutdown mode
REVISION A ERRATA
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 I
2
S mode in addition to
left/right justified. After careful observation of actual part operation, it was found that data formatted using
the I
2
S standard cannot be properly decoded by the MAX9850.
I
2
S is a "catch-all" term used to generically describe many digital audio interfaces. In reality, I
2
S is one of many
digital audio formats that can be used to send digital audio data to a decoder. I
2
S 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.
MAX9850
Stereo Audio DAC with
DirectDrive Headphone Amplifier
ERRATA SHEET
www.maxim-ic.com
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
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
MASTER MODE: S_WCI = 0, S_BCI = 0, S_DLY = 0, S_WS = 0
LEFT DATA SAMPLE
LEFT
LRCLK(OUT)
SDIN
BCLK(OUT)
SDOUT
RIGHT
RIGHT DATA SAMPLE
RIGHT DATA SAMPLE
LEFT DATA SAMPLE
Figure 1. Left-Justified Audio Data
1 of 2
Figure 2 shows digital audio data formatted using the I
2
S standard. I
2
S-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 I
2
S and left-justified digital audio formats.
Work Around:
Left-justified audio mode must be used instead of I
2
S 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 (I
2
S) 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.
MAX9850 ERRATA SHEET
2 of 2
01514131211109 8 7
6
54321 01514 13 12 11 10 9 8 7
6
54321
01514131211109 8 7
6
54321 0
01514131211109 8 7
6
54321
LEFT DATA SAMPLE
LEFT DATA SAMPLE
LRCLK(OUT)
SDIN
BCLK(OUT)
SDOUT
RIGHT
RIGHT DATA SAMPLE
RIGHT DATA SAMPLE
LEFT
MASTER MODE: S_WCI = 0, S_BCI = 0, S_DLY = 0, S_WS = 0
Figure 2. I
2
S-Formatted Digital Audio Data
  • Page 1 1
  • Page 2 2

Maxim MAX9850 User manual

Maxim
Brand
Maxim
Model
MAX9850
Type
User manual

Maxim MAX9850

The Maxim MAX9850 Stereo Audio DAC with DirectDrive Headphone Amplifier is a high-performance audio solution that offers exceptional sound quality and versatility. With its advanced features and ease of use, the MAX9850 is an ideal choice for a wide range of audio applications, including portable devices, home audio systems, and professional audio equipment.

Key Features:

  • Stereo audio DAC with 24-bit resolution and 192kHz sample rate
  • DirectDrive headphone amplifier with up to 130mW output power
  • I2S and left/right-justified digital audio interfaces
  • Flexible power management with low-power shutdown mode
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