The ASD-272p is the industry’s smallest S-video
decoder. This product automatically detects NTSC, PAL,
PAL-M, PAL-N, and SECAM S-video signals and
provides a 4:2:2 serial digital signal conforming to the
SMPTE 259M-C standard. The supported inputs range
from stable, studio-type sources to satellite and VTRtype sources. This feature-packed unit delivers ease-ofuse, a simplified design, easy installation and operation.
S-VIDEO
IN
Decoder
Parallel
to serial
Figure 1: ASD-272p functional block diagram
1.2 Features
§Automatic input detection of NTSC, PAL, PAL-M,
PAL-N, and SECAM S-video signals
§ 4:2:2 output
§ Input setup selection: 7.5 or 0 IRE
§ Input signal stability selection: VTR, Tuner
(satellite), and Studio
§Bi-color LED providing error status on input
composite signal
§Very small packaging aluminum extruded body
4:2:2 OUT
1
ASD-272p
2.0 Overall View
Figure 2 illustrates the ASD-272p’s major parts and their
locations. The video source is connected to the S-video
input BNC and the decoded signal is provided by the
4:2:2 output. Error status is provided by the status LED
and mode settings are configured by two 3-position slide
switches. Finally, the power source is connected to the
power connector.
S-video input
Status LED
Power connector
3-position slide switches
4:2:2 output
Figure 2: Overall view of the ASD-272p
2
Guide to Installation and Operation
3.0 Installation
3.1 Power Supply
The power supplies LKS-WSA and LKS-WSE, for 110 V
and 220 V operation respectively, are used to power the
ASD-272p. Each power supply provides a regulated +5
VDC@750 mA power source. The ASD-272p employs a
mini XLR-3 connector for its power needs. Figure 3
provides a detailed pinout of the male connector.
(male connector-facing)
1 3
Pin 1: Shield
Pin 2: GND
Pin 3: +5 VDC
2
Figure 3: Power connector pinout
3
ASD-272p
3.2 Composite Input
Connect a NTSC or PAL, PAL-M, PAL-N, SECAM Svideo signal conforming to the SMPTE 170M or ITU
(CCIR) 624-4 standard respectively to the BNC labeled
S-VIDEO IN.
(male connector-facing)
1
3
4
Figure 4: S-video connector pinout
3.3 4:2:2 Output
The 4:2:2 serial digital output signal is provided by the
BNC labeled 4:2:2 OUT. The 4:2:2 output signal
conforms to the SMPTE 259M-C standard.
7.5 IRE: For S-video sources with 7.5 IRE setup, set
SW1 to this position.
0 IRE: For S-video sources with 0 IRE setup, set
SW1 to this position.
Input stability switch (SW2)
VTR: This position should be set for non-time
based corrected sources.
Tuner: Decoding satellite sources or sources with
unpredictable voltage levels is improved with
the Tuner setting.
Studio: Set this position when using stable S-video
sources.
Note: NTSC/PAL-M Input Detection
5
ASD-272p
If switching from an NTSC source to a PAL-M source
which are both synchronized, the picoLink units may
interpret the PAL-M source as an NTSC source. If so,
the unit will not switch to PAL-M. In order to recover
from this problem, disconnect the source from the input
BNC and reinstall it.
4.2 Status LED
The bi-colored status LED, located next to the S-video
input cable, is provided to identify any input errors. The
following lists the possible situations.
Green: Indicates the ASD-272p is powered and has
detected a valid S-video signal.
Red: Indicates an error with the input signal has
been detected or simply, there is no input
signal installed.
6
Guide to Installation and Operation
5.0 Specifications
Input
Signal: S-video 1 Vpp nominal with sync
Return loss: > 35 dB up to 5 MHz
Connector : Cable with male mini-Din 4
Output
Signal: 4:2:2 SMPTE 259M-C (270
Mbps)
Return loss: > 15 dB up to 270 MHz
Jitter: < 10 ns p-p
Connector : 75 Ω BNC
Processing performance
Quantization: 8 bits
Freq. response: ±0.5 dB to 5 MHz
Processing delay: 4.5 us
Electrical
Voltage requirement: +5 VDC
Power consumption: 3 W
Power connector: Mini XLR-3
Mechanical
Overall size: 102 mm x 25 mm x 18 mm
(4” x 1” x 0.7”)
Power cable length: 127 mm (5”)
Full spec. temp. range: 0° C (32° F) to 30° C (86° F)
7
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