Burr-Brown Products from Texas Instruments
User’s Guide SLAU070 - June 2001
DEM-DIR1701 Instruction Manual Hajime Kawai
DAV Digital Audio/Imaging Japan (DAI)
Feature and Description The DEM-DIR1701 is an evaluation board for digital audio interface receiver IC DIR1701. This board generates very low jitter system clock and PCM audio data for audio DAC interface from an S/PDIF digital audio interface input. The DEM-DIR1701 has switch-selectable coax and optical inputs. It accepts sampling rates up to 96 kHz. This board requires a 5-V power supply; a 3.3-V power supply is also required when jumper JP–1 is removed. An internal 3.3-V regulator IC is used for operation of the DIR1701. The 5-V power supply operates the optical receiver and the input logic section. The PCM audio interface format and generated system clock frequency (either 128fs, 256fs, 384fs, or 512fs) can be selected by control switch SW2.
Basic Connection In initial conditions, a 5-V power supply must be applied through CN–1 with jumper JP–1 connected. Both 5-V and 3.3-V supplies must be connected through CN–1 when JP–1 connection is removed. 1
SLAU070 5 V GND 3.3 V JP-1 CN-1 SW1 PCM Audio Interface
Coax Input
CN-2
Optical Input
Figure 1. DEM–DIR1701 S/PDIF digital audio interface can use coax or optical input as selected by switch SW1.
Operation Control Switch SW2: Function Control L H SCF0 SCF1
System Clock Select
RESET H: Reset. L: Normal
SCF1 SCF0 SYSCKL 128 fs L L 256 fs H L 384 fs L H 512 fs H H
FMT0 FMT1
Interface Format Select
CKSL L: PLL Mode. H: Crystal Mode FMT1 FMT0 L L H L L H H H
Audio Interface Format 16-bit, MSB first, right-justified 24-bit, MSB first, right-justified 24-bit, MSB first, left-justified 24-bit, IIS
NOTES: 1. Reset is active low at RESET pin, silk printed LH at SW2 on board is inverted. Reset operation is required after power up. 2. Silk print SCF0 and SCF1 is inverted. 3. CKSL must be L (crystal mode is not available), 12-MHz crystal is mounted. 4. See DIR1701 PDS for JP–2 and JP–3 jumper connection.
Figure 2. Operation Control Switch
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DEM-DIR1701 Instruction Manual
SLAU070
DEM-DIR1701 Schematic Diagram
IN
REG1117
OUT
C1 100 µF +
JP-1
C3 0.1 µF
B
2
C
3
D
4 10 µF + C6
0.1 µF
5
C8
6 7
R1
8 9
CN-2 C9
SYSCLK GND
C10
XT 22P
10 11
22P
12
LRCK
13
BCK
14
DATA
C4 0.1 µF
CF2 220 pF
CKSEL 28 SW-2 27 BRATE0 UNLOCK A 26 BRATE1 FMT1 25 SCKO FMT0 24 0.1 µF 10 µF VDD VCC + C5 23C7 DGND AGND 22 XTO FLT 21 RST XTI 20 A CKTRNS DIN 19 LRCKO BRSEL 18 BCKO BFRAME 17 DOUT EMFLG 16 SCF0 URBIT 15 CSBIT SCF1 ADFLG
CKTRNS R1 R1
COAX IN PJ-1
C14 R2 75 Ω
OPT IN
U4
1 MΩ
0.047 µF U3 74HCU04
3
C11 + 10 µF
47 Ω 14
CF1 0.022 µF RF1 6.8 kΩ
JP-2
U1 DIR1701 1
C1 100 µF +
C13
FMT1 FMT2 RESET SCF1 SCF2
UNLOCK FLT(*1) BFRAME EMFLG(*2) URBIT CSBIT
B
ADFLG
C
BRATE0
D
BRATE1 GND
0.1 µF
CN-3 JP-3
7 C12 0.1 µF
CKSEL
SW-1
(*1) : Silk Shows EMFLG/FLT (*2) : Silk Shows PEFLG
TORX-173/179 1 2 4
5 6
COAX / OPT
DEM-DIR1701 Instruction Manual
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SLAU070
Parts Location
TOP VIEW
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DEM-DIR1701 Instruction Manual
BOTTOM VIEW
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Copyright 2001, Texas Instruments Incorporated
