Grass Valley ASD-272p User Manual

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CONTENTS

page

1.0 ASD-272p .......................................….. 1

1.1 Introduction ………………………............. 1

1.2 Features .........................................…….. 1

2.0 Overall View ………….......................... 2

3.0 Installation .......................................... 3

3.1 Power Supply .......................................... 3

3.2 S-Video Input ……..……………............... 4

3.3 4:2:2 Output ………..……..……............... 4

4.0 Operation ............................................ 5

4.1 Switch Settings ....................................... 5

4.2 Status LED ………………………............... 6

5.0 Specifications ................………..……. 7

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Guide to Installation and Operation

1.0 ASD-272p

1.1 Introduction

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.

Pin 1: Luma

2

Pin 2: Chroma
Pin 3: Luma ground
Pin 4: Chroma ground

4

Guide to Installation and Operation

4.0 Operation

4.1 Switch Settings

Figure 5 outlines the slide switch functions.

Miranda Technologies inc.
Made in Canada

Input setup (SW1)

Input stability (SW2)

ASD-272p

7.5 IRE

0 IRE

VTR

Tuner

Studio

Figure 5: ASD-272p switch settings
Input setup switch (SW1)

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)

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