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PDF AL1401A Data sheet ( Hoja de datos )
| Número de pieza | AL1401A | |
| Descripción | Optical Encoder | |
| Fabricantes | Wavefront | |
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AL1401A
ADAT® Optical Encoder
General Description
The AL1401A OptoGen interface encodes
four stereo pairs (8 channels) of digital
audio and produces a single datastream
suitable for transmission according to the
industry-standard ADAT Optical protocol
(U.S. patent number 5,297,181).
With an internal PLL to generate all
needed clock signals, the AL1401A
requires only wordclock (Fs) for proper
operation.
A companion decoder, the AL1402
OptoRec™, is also available.
Use of the ADAT Optical interface
(including the OptoGen and OptoRec)
requires a license agreement (generally
royalty-free) between the manufacturer
and Wavefront Semiconductor. Details
and agreement information are available
upon request from Wavefront directly, or
on our web site.
Features
Compatible with ADAT Type I and II
formats
4 stereo pairs as inputs using standard
DAC formats
4 user bit inputs to transmit time-code,
MIDI data, etc.
Internal PLL generates all required clocks
from wordclock
Applications
Digital Mixing Boards
Signal Processors
Digital Effects Boxes
Digital Recorders
Computer Sound Boards
Sound Reinforcement Products
Package
GND
N/C
N/C
WDCLK
RESET
WDCLKNEG
FMT0
FMT1
FMT2
FMT3
20 pin SOIC
300 mils wide
VDD
OPDIGOUT
USER3
USER2
USER1
USER0
IN 7/8
IN 5/6
IN 3/4
IN 1/2
Wavefront Semiconductor ∴ 200 Scenic View Drive ∴ Cumberland, RI 02864 ∴ U.S.A.
On the web at www.wavefrontsemi.com
1
AL1401A-0305
Free Datasheet http://www.Datasheet4U.com
1 page  
ADAT Optical Datastream
The AL1401A provides support for both the ADAT Type I format (16-bit) and the ADAT Type II
format (20-bit). Data lengths of up to 24 bits is supported. USER0 is used to transmit the ADAT
format 32-bit timecode, USER1 is used to transmit MIDI data, USER2 indicates the presence of
S/Mux data, USER3 is reserved and should be tied low. All user bits are sampled at the WDCLK
edge that indicates the end of right channel data.
Reset Circuitry
An OptoGen reset using the /Reset pin is asynchronous, and a minimum pulse width of 10ns is
sufficient. This will reset all internal counters and state registers to their initial state and
disrupt the OPDIGOUT datastream. However, PLL lock will not be disturbed.
Clock Generator and PLL
The OptoGen contains an internal PLL that locks to the rising edge of WDCLK and produces all
necessary high frequency clocks and timing signals to operate the device. This high quality PLL
will reject any high-frequency jitter on the incoming wordclock. Receiving a crystal-derived
48kHz on WDCLK, and audio data on all 8 input channels, the jitter was measured to be 630ps
typical on OPDIGOUT.
The PLL allows a simplified user interface and eliminates the need of running high frequency
clocks to the part on PCB traces. This reduces unwanted RF noise and coupling problems that
can occur when such clock signals are required on input pins for a device.
Package Dimensions
A
20
CB
1
11
10
Dimensions (Typical)
Inches
Millimeters
A 0.504”
12.80
B 0.295”
7.50
C 0.406”
10.30
D 0.100”
2.50
E 0.008”
0.20
F 0.025”
0.64
G 0.050”
1.27
H 0.017”
0.42
J 0.011”
0.27
K 0.352”
8.94
L 0.033”
0.83
Note: Dimension “A” does not include
mold flash, protrusions, or gate burrs.
D
E
7° nom
H
G
F
4° nom
J
K
L
www.wavefrontsemi.com
5
Free Datasheet http://www.Datasheet4U.com
5 Page | ||
| Páginas | Total 7 Páginas | |
| PDF Descargar | [ Datasheet AL1401A.PDF ] | |
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