Texas Instruments PCM1681, User Manual

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10
Description
SBAU137 – April 2008
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DEM-DAI/MDAC Motherboard
Ch 7
Ch 8
External-I/F
(CN004)
Ch 5
Ch 6
Ch 3
Ch 4
DAC
PCM1681
CLKO
BCLK
LRCK
DATA1
DATA2
DATA3
DATA4
DAI
(Bus)
Select
DIR
Ch 1
Ch 2
2nd-order LPF
L/R-ch
OPA2134
(f
C
= 54 kHz)
L/R-ch 2nd-order LPF
OPA2134
(f
C
= 54 kHz)
L/R-ch 2nd-order LPF
OPA2134
(f
C
= 54 kHz)
L/R-ch
2nd-order LPF
OPA2134
(f
C
= 54 kHz)
(DEM-1681
Daughtercard)
CS8414
Coax
and
Logic
SCLK
OPT
JUMPER
Format Control
+5 V
3.3 V
REG
SW006
Mode Control Interface to PC
ML MC MDI RST MDO
GND+5 V − 15 V GND+15 V
M2, M1, M0
Functional Block Diagram
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1.1 Functional Block Diagram
Figure 1-1 illustrates the functional block diagram of the DEM-DAI1681.
Figure 1-1. DEM-DAI1681 Functional Block Diagram
1.2 EVM Description
The DEM-DAI1681 EVM is shipped with the following items:
•
EVM Motherboard: DEM-DAI/MDAC
•
EVM Daughtercard: DEM-PCM1681
•
CD-ROM containing application software, a copy of this user's guide, and a PCM1681 product data
sheet
If any of these items are missing or damaged, please contact your local Texas Instruments representative.
This EVM consists of two PCBs. The DEM-DAI/MDAC motherboard is a common PCB for similar devices
such as the DEM-DAI1608 and the DEM-DAI1680 . The DEM-PCM1681 daughtercard contains the
PCM1681 DAC device, as shown in Figure 1-1 .