DEM-DAI1604 Datasheet, PDF (3/11 Pages) Burr-Brown (TI) – EVALUATION FIXTURE

SWITCHES
Switches SW1 through SW3 are used to select the audio data
output format for the CS8414. Table II shows the output
format selections that are used with the PCM1604.
SW1 SW2 SW3 DATA FORMAT
L
L
L
16-24 Bit Left-Justified, MSB-First⁽¹⁾
L
H
L
16-24 Bit I²S⁽²⁾
H
L
H
16-bit Standard Right-Justified, MSB-First⁽²⁾
H
H
L
18-bit Standard Right-Justified, MSB-First⁽²⁾
NOTE: (1) Jumper JP1 must be set to the INV position when using this format.
(2) Jumper JP1 must be set to the NML position when using this format.
TABLE II. Digital Audio Receiver Output Data Format
Settings.
Switch SW5 is used to set the state of the reset (RST) pin of
the PCM1604. Table III shows the reset selections.
CKS0 and CKS1 are unused and should be set to ‘L’.
RST
L
H
MODE OF OPERATION
Normal
Reset⁽¹⁾
NOTE: (1) The RST pin of the PCM1604 is active LOW. Due to the demo
board design, the ‘H’ selection closes the switch and connects RST to
ground. The ‘L’ selection opens the switch and the RST pin is set to
logic ‘1’ by an internal pull-up resistor.
TABLE III. Reset (RST) Operation.
JUMPERS
Jumper JP1 is used to select a non-inverted (NML) or
inverted (INV) bit clock for the PCM1604. Table IV shows
the proper settings for JP1 for the four input data formats
shown in Table II.
DATA FORMAT
16 - 24-Bit Left-Justified, MSB-First
16 - 24-Bit I²S
16-Bit, Standard Right-Justified, MSB-First
18-Bit, Standard Right-Justified, MSB-First
JP1 SELECTION
INV
NML
NML
NML
TABLE IV. JP1 Jumper Selection for Audio Data Formats.
Jumper block JP2 is used to connect the digital audio
receiver output data and clocks to the PCM1604 daughter
card. The jumpers may be removed from JP2 to allow
connection to an audio DSP or decoder. Figure 1 shows the
electrical connections for JP2. Note that pins DIN1 through
DIN3 include 10kΩ pull-down resistors, which may be used
to set the data inputs to logic ‘0’ for testing zero detection
functions and output cross talk performance.
Jumper JP3 is used to enable or disable the on-board +3.3V
regulator output. When the jumper is installed, the regulator
is used as the +3.3V supply. When it is removed, an external
supply, connected at CN4, may be used to supply the +3.3V.
SCHEMATICS
Schematics for the DEM-DAI1604 are shown in Figures 1
through 4. Figure 1 shows the digital audio receiver, associ-
ated logic, and digital I/O connectors. Figure 2 shows the
DAC low pass filters, while Figure 3 illustrates the power
supply connections. Figure 4 shows the PCM1604 daughter
card circuitry and connectors.
®
3
DEM-DAI1604