AN1250 STMicroelectronics, AN1250 Datasheet - Page 10

• Manufacturer Part Number: AN1250
• Description: STA014/STA015 MPEG LAYER III DECODER AND ADPCM CODEC
• Manufacturer: STMicroelectronics

AN1250 APPLICATION NOTE
Figure 9. LPT interface schematic
6.2 STA014/STA015 Evaluation board
The STA014/STA015 evaluation board layout is shown in Figure 10. If the board is operated without the ST pro-
vided LPT interface a single 3V power supply must be used (J1 connector): DL1 led will indicate supply pres-
ence.
All the STA014/STA015 useful signals and control lines are available on the J3 20 pin connector: no buffering
exist between device and connector pins.
10/21
J3
1
2
J1
14
15
16
17
18
19
20
21
22
23
24
25
47 F
10
11
12
13
10V
C1
1
2
3
4
5
6
7
8
9
100nF
R2 10K
C2
D2
D3
D4
D5
D6
D7
GND
GND
N.C.
VIN
U3
8
7
6
5
LE52
ABD
JP1
74HCT14
74HCT14
74HCT14
74HCT14
74HCT14
1
2
3
4
13
11
12
10
1
3
5
9
2
4
6
VOUT
GND
GND
N.C.
U1A
U1F
U1B
U1E
U1C
U1D
U2A
U2B
U2E
U2C
U2F
12
10
13
11
74LVX14
2
74LVX14
74LVX14
4
74LVX14
74LVX14
6
74LVX14
8
1
3
5
3.9K
47 F
10V
C3
+5V
100nF
R3 10K
C4
GND
GND
N.C.
VIN
8
7
6
5
U4
LE33
ABD
JP2
V
+5V
D2
D3
D4
D5
D6
D7
1
2
3
4
DD
74HCT14
VOUT
GND
GND
N.C.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
D00AU1188
J2
8
47 F
10V
C5
U2D
V
9
DD
100nF
C6