ALESS AL1401A Datasheet
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General Description
The AL1401A OptoGen interface is
designed to accept four stereo pairs of
audio data and produce the data stream
â
appropriatefortheAlesisADAT
format, U.S. patent number 5,297,181.
Use of this product requires a license
agreement between manufacturer and
Alesis Studio Electronics. Details and
agreement information are available upon
request from Alesis Semiconductor or
Alesis Studio Electronics.
optical
GND
Features
G
Compatible with ADATâType I and II
formats
G
4 stereo pairs as inputs using standard
DAC formats
G
4 user bit inputs to transmit timecode, MIDI data, etc.
G
Internal PLL generates required clocks
from Word Clock.
Applications
G
Transmit information to ADAT
compatible devices
VDD
â
N/C
N/C
WDCLK
RESET
WDCLKNEG
FMT0
FMT1
FMT2
FMT3
OPDIGOUT
USER3
USER2
USER1
USER0
IN 7/8
IN 5/6
IN 3/4
IN 1/2
Figure A. 24 pin SOIC
Alesis Semiconductor
DS1401A-0702 12555 Jefferson Blvd., Suite285
Los Angeles, CA 90066
Phone (310) 301-0780 Fax (310) 306-1551 www.alesis-semi.com
Table 1. Electrical Characteristics and Operating Conditions
Symbol Description Min Typ Max Units
Electrical Characteristics and Operating Conditions
V
DD
I
DD
GND Ground - 0.0 - V
Fs Sample rate 30 48 55 kHz
Temp Temperature
Outputs (OPDIGOUT)
V
OH
V
OL
I
OH
I
OL
Inputs (WDCLK, WDCLKNEG, FMT, IN, USER, RESET)
V
IH
V
IL
I
IH
I
IL
C
IN
Supply Voltage 4.5 5.0 5.5 V
Supply Current - 1.5 - mA
Logical “1” output
voltage
Logical “0” output
voltage
Logical “1” output
current
Logical “0” output
current
Logical “1” input
voltage
Logical “0” input
voltage
Logical “1” input
current
Logical “0” input
current
Logic Input
Capacitance
02570
0.9 V
DD
--V
--0.1V
---8mA
--8mA
0.75 V
DD
--V
--0.25V
--1uA
--1uA
-5-pF
°C
DDVDD
DDVDD
DD
DD
Table 2. Pin Descriptions
Pin # Name Pin Type Description
1GND Power
2N/C 3N/C 4WDCLK Input
5RESET Input
6WDCLKNEG Input
7FMT0 Input
8FMT1 Input
9FMT2 Input
10 FMT3 Input
11 IN 1/2 Input
12 IN 3/4 Input
13 IN 5/6 Input
14 IN 7/8 Input
15 USER0 Input
16 USER1 Input
17 USER2 Input
18 USER3 Input
19 OPDIGOUT Output
20 V
DD
Power
Ground pin
No connection
No connection
Word clock. Equal to sample frequency (Fs)
Active low reset
Sets phase of word clock
Format0, Sets data format
Format1. Sets data format
Format2. Sets data format
Format3. Sets data format
Channels1and2datainput
Channels3and4datainput
Channels5and6datainput
Channels7and8datainput
User 0 data bit input. Used to transmit timecode.
User 1 data bit input. Used to transmit MIDI data.
User 2 data bit input. Reserved, tie low.
User 3 data bit input. Reserved, tie low.
Output to optical driver
+5V power pin
Alesis Semiconductor
DS1401A-0702 12555 Jefferson Blvd., Suite285
Los Angeles, CA 90066
Phone (310) 301-0780 Fax (310) 306-1551 www.alesis-semi.com
-2-
Table 3. Formats
Format0 Format1 Format2 Format3 Mode
000016-bitrightjustified
100018-bitrightjustified
010020-bitrightjustified
110022-bitrightjustified
0 0 1 0 16-bit left justified
1 0 1 0 18-bit left justified
0 1 1 0 20-bit left justified
1 1 1 0 22-bit left justified
0 0 0 1 Reserved
1 0 0 1 Reserved
0 1 0 1 Reserved
1 1 0 1 Reserved
001124-bitrightjustified
1 0 1 1 24-bit left justified
0 1 1 1 Reserved
1111Mute
one period WordClock, WordNeg Low
WordClock
Right Just 16
Right Just 18
Right Just 20
Right Just 22
Left Just 16
Left Just 18
Left Just 20
Left Just 22
Right Just 24
Left Just 24
15
MSB
17
MSB
19
MSB
21
MSB
23
MSB
15
MSB
17
MSB
19
MSB
21
0
0
MSB
0
MSB
0
0
0
0
0
023
15
MSB
17
MSB
MSB
21
MSB
23
MSB
0
0
0190
23
MSB
21
MSB
0
19
MSB
0
17
MSB
15
MSB
0
0
0
0
0
Figure B. Format Timing
Alesis Semiconductor
DS1401A-0702 12555 Jefferson Blvd., Suite285
Los Angeles, CA 90066
Phone (310) 301-0780 Fax (310) 306-1551 www.alesis-semi.com
-3-
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