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PDF GS2974B Datasheet ( Hoja de datos )

Número de pieza GS2974B
Descripción HD-LINX III Adaptive Cable Equalizer
Fabricantes Gennum 
Logotipo Gennum Logotipo

Total 17 Páginas
		
GS2974B Hoja de datos, Descripción, Manual
GS2974B HD-LINX™ III Adaptive Cable Equalizer
Features
• SMPTE 424M, SMPTE 292M, 344M and SMPTE 259M
compliant
• Automatic cable equalization
• Multi-standard operation from 143Mb/s to 2.97Gb/s
• Supports DVB-ASI at 270Mb/s
• Small footprint (4mm x 4mm)
• Pb-free and RoHS compliant
• Manual bypass (useful for low data rates with slow
rise/fall times)
• Performance optimized for 1.485Gb/s and 2.97Gb/s
• Typical equalized length of Belden 1694A cable: 140m
at 2.97Gb/s, 230m at 1.485Gb/s, and 250m at 270Mb/s
• 50Ω differential output (internal 50Ω pull-ups)
• Programmable mute based on max cable length adjust
• Single 3.3V power supply operation
• Operating temperature range: 0°C to +70°C
• Footprint compatible with GS2974A and GS1574A
Applications
• SMPTE 424M, SMPTE 292M and SMPTE 259M Coaxial
Cable Serial Digital Interfaces.
Description
The GS2974B is a high-speed BiCMOS integrated circuit
designed to equalize and restore signals received over 75Ω
co-axial cable.
The GS2974B is designed to support SMPTE 424M, SMPTE
292M and SMPTE 259M, and is optimized for performance
at 1.485Gb/s and 2.97Gb/s.
The GS2974B features DC restoration to compensate for the
DC content of SMPTE pathological test patterns.
A voltage programmable mute threshold (MCLADJ),
applicable for SD mode (refer to Section 4.3), is included to
allow muting of the GS2974B output when an approximate
selected cable length is reached for SMPTE 259M signals.
This feature allows the GS2974B to distinguish between
low amplitude SD-SDI signals and noise at the input of the
device. The serial digital outputs of the GS2974B may be
forced to a mute state by applying a voltage to the MUTE
pin.
Power consumption is typically 215mW using a 3.3V
power supply. The GS2974B is lead-free, and the
encapsulation compound does not contain halogenated
flame retardant.
This component and all homogeneous subcomponents are
RoHS compliant.
MCLADJ
CABLE LENGTH ADJUSTOR
CARRIER DETECT
MUTE
SDI EQUALIZER
SDI
DC RESTORE
OUTPUT
AGC
GS2974B Functional Block Diagram
GS2974B GS2974B HD-LINX™ III Adaptive Cable
Equalizer
Data Sheet
45062 - 3
April 2009
www.gennum.com
CD
MUTE
BYPASS
SDO
SDO
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GS2974B pdf
Table 1-1: GS2974B Pin Descriptions (Continued)
Pin Number
10, 11
12
Name
SDO, SDO
VEE_D
Timing
Analog
Analog
Type
Output
Power
13
VCC_D
Analog
Power
14
MUTE
Not
Input
Synchronous
15 CD Not Output
Synchronous
16
VCC_A
Analog
Power
Center Pad
Power
Description
Equalized serial digital differential output.
Most negative power supply for the digital circuitry and output
buffer.
Connect to GND.
Most positive power supply for the digital I/O pins of the device.
Connect to +3.3V DC.
CONTROL SIGNAL INPUT
levels are LVCMOS/LVTTL compatible. (3.3V Tolerant)
Controls output behaviour on SDO and SDO
See Section 4.4.
STATUS SIGNAL OUTPUT
Signal levels are LVCMOS/LVTTL compatible.
Indicates the presence of a good input signal.
See Section 4.4.
Most positive power supply for the analog circuitry of the device.
Connect to +3.3V DC.
Internally bonded to VEE_A.
GS2974B GS2974B HD-LINX™ III Adaptive Cable
Equalizer
Data Sheet
45062 - 3
April 2009
5 of 17
Free Datasheet http://www.datasheet4u.com/

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GS2974B arduino
does not solve this problem, since the signal to noise ratio on the circuit board could be
significantly less than the default signal detection level set by the on chip reference.
NOTE: MCLADJ is only recommended for data rates up to 360Mb/s. For data rates above
this, MCLADJ should be left floating.
4.4 Mute and Carrier Detect
The GS2974B includes a MUTE input pin that allows the application interface to mute
the Serial Digital Output at any time. Set the MUTE pin HIGH to mute SDO and SDO. In
this case, the outputs will mute regardless of the setting of the BYPASS pin.
A Carrier Detect output pin (CD) indicates the presence of a valid signal at the input of
the GS2974B. When CD is LOW, the device has detected a valid input on SDI and SDI.
When CD is HIGH, the device has not detected a valid input.
NOTE 1: CD will only detect loss of carrier for data rates greater than 19Mb/s. The CD
output pin may be connected directly to the MUTE input pin to enable automatic muting
of the GS2974B when no valid input signal has been detected.
NOTE 2: If the maximum cable length is exceeded (set by the MCLADJ pin) and the
device is not in Bypass mode, the CD pin will not be driven low, even if a carrier is
present.
Table 4-1: Mute Input Table
Mute
0
1
Function
SDO and SDO operate normally
SDO and SDO are forced to a steady
state
Table 4-2: CD Output Table
CD Input Status
0 Valid Input on SDI, SDI pins
1 Input is not valid
GS2974B GS2974B HD-LINX™ III Adaptive Cable
Equalizer
Data Sheet
45062 - 3
April 2009
11 of 17
Free Datasheet http://www.datasheet4u.com/

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