MAX9850EVCMOD2# Maxim Integrated, MAX9850EVCMOD2# Datasheet - Page 9

• Manufacturer Part Number: MAX9850EVCMOD2#
• Description: Audio D/A Converter ICs MAX9850 Evaluation System/Evaluation Kit
• Manufacturer: Maxim Integrated
• Series: MAX9850r

Specifications of MAX9850EVCMOD2#

• Resolution: 18 bit
• Interface Type: I2C
• Snr: 91 dB
• Operating Supply Voltage: 1.8 V to 3.6 V
• Operating Temperature Range: - 40 C to + 85 C
• Supply Current: 7.6 mA
• Maximum Power Dissipation: 2857 mW
• Number Of Dacs: 1
• Output Voltage: 1.95 V
• Thd Plus Noise: 87 dB

Figure 9. Slave (Integer) Mode
Left/Right Clock frequency can be entered into the
Desired LRCLK Freq edit box. The EV kit software will
automatically calculate the correct MSB/LSB values
and write them to the MAX9850 registers.
The Slave (Non-Integer) mode (Figure 8) of the
MAX9850 does not rely on the MSB or LSB registers for
operation. Slave (Integer) mode (Figure 9) can be
operated manually by entering a number in the LSB
edit box. When using the Automatic mode, the
MAX9850 EV kit software calculates the correct LSB
value and writes it to the appropriate IC register.
Digital audio control and miscellaneous configuration
options are accessed through the Digital Audio/
Configuration tab (Figure 10).
In addition to a serial data delay, the MAX9850 can also
accept an inverted bit clock (BCLK) or left/right clock
(LRCLK). Configure the MAX9850 by checking the
desired Invert or Delay checkboxes. Choose the desired
Data Format and Justification from the pulldowns.
The MAX9850 EV kit software is designed to control
both the on-board S/PDIF receiver chip as well as the
MAX9850. To maintain a valid digital link between the
two ICs, the MAX9850 EV kit software features a Lock
checkbox in both the Signals and Word Size group
boxes. When the Signals/Lock checkbox is checked,
the EV kit software will ensure that BCLK Invert,
MAX9850 Evaluation System/Evaluation Kit
_______________________________________________________________________________________
Digital Audio/Configuration
LRCLK Invert, SDIN/OUT Delay, and Justification
settings for both the MAX9850 and the on-board S/PDIF
receiver match. When the Word Size/Lock checkbox is
checked, the EV kit software will ensure that the word
size settings for both the MAX9850 and the on-board
S/PDIF receiver match.
For example, if the MAX9850 BCLK Invert checkbox is
altered, the MAX9850 EV kit software automatically
changes the Receiver BCLK Invert checkbox to
match. All appropriate I
and the system will continue to function properly.
Note: Unchecking either of the lock checkboxes will
allow the software to operate in a state that may not be
functional. Undesirable results may occur.
The GPIO of the MAX9850 is also configured on this tab.
Click the desired radio button to alter the Pin Direction
or the GPIO Output State. To route the MAX9850 inter-
nal interrupt signal to the GPIO pin, check the Enable
Interrupt on GPIO checkbox.
The MAX9850 EV kit software also controls the on-
board S/PDIF receiver. Receiver control and status are
divided into two tabs.
Receiver control is accessed through the Main Control
sub-tab, which is located under the Receiver tab
(Figure 11).
Choose the desired S/PDIF input (Optical or Electrical)
in the Digital Audio Input Selection box. Mute the
receiver output by checking the Mute Receiver Output
checkbox. Activate the receiver’s de-emphasis filter by
choosing the desired option in the Receiver De-
Emphasis Filter box. The on-board digital receiver fea-
tures programmable error handling. Choose the
desired method for handling S/PDIF errors in the Audio
Error Handling box.
Receiver status is accessed through the Status sub-
tab, which is under the Receiver tab (Figure 12). This
tab serves as an invaluable diagnostic tool when evalu-
ating the MAX9850 EV kit.
Read the error status by clicking the Read Status button
in the Receiver Error Status window. The Monitor check-
boxes must be selected for the status bits to be valid.
Click the Read Status button in the Status box to read
the receiver status. To have the software automatically
read the receiver status at constant time intervals,
check the Automatic Read checkbox.
2
C data will be sent to both ICs
Receiver Main Control
Receiver Status
Receiver
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