DataSheet.es GS2974A Hoja de datos PDF


PDF GS2974A Datasheet ( Hoja de datos )

Número de pieza GS2974A
Descripción HD-LINX III Adaptive Cable Equalizer
Fabricantes Gennum 
Logotipo Gennum Logotipo
Vista previa
Total 16 Páginas
		
GS2974A datasheet

1 Page

GS2974A pdf
Table 1-1: GS2974A 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.
GS2974A HD-LINX™ III Adaptive Cable Equalizer
Data Sheet
42216 - 3
January 2009
5 of 16
Free Datasheet http://www.datasheet4u.com/

5 Page

GS2974A arduino
4.2 Cable Equalization
The input signal passes through a variable gain equalizing stage whose frequency
response closely matches the inverse of the cable loss characteristic. In addition, the
variation of the frequency response with control voltage imitates the variation of the
inverse cable loss characteristic with cable length.
The edge energy of the equalized signal is monitored by a detector circuit which
produces an error signal corresponding to the difference between the desired edge
energy and the actual edge energy. This error signal is integrated by both an internal and
an external AGC filter capacitor providing a steady control voltage for the gain stage. As
the frequency response of the gain stage is automatically varied by the application of
negative feedback, the edge energy of the equalized signal is kept at a constant level
which is representative of the original edge energy at the transmitter. The equalized
signal is also DC restored, effectively restoring the logic threshold of the equalized signal
to its correct level independent of shifts due to AC coupling. The digital output signals
have a nominal voltage of 750mVpp differential, or 375mVpp single ended when
terminated with 50Ω as shown in Figure 4-1.
SDO
+187.5mV
VCM = 2.925V
typical
-187.5mV
SDO
50 50
+187.5mV
VCM = 2.925V
typical
-187.5mV
Figure 4-1: Typical Output Voltage Levels
4.3 Programmable Maximum Cable Length Adjust (MCLADJ)
For SMPTE 259M inputs, the GS2974A incorporates a programmable Maximum Cable
Length Adjust (MCLADJ) threshold.
This feature can be useful in applications where there are multiple input channels using
the GS2974A and the maximum gain can be limited to avoid crosstalk.
The MCLADJ pin acts to change the threshold of the Carrier Detect (CD) pin. When the
input signal drops below a certain threshold, the CD pin will be driven high, indicating
that there is not a valid input signal. In order to enable automatic muting of the output
of the GS2974A, the CD pin should be connected directly to the MUTE pin. In
applications where programmable maximum cable length adjust is not required, the
MCLADJ pin may be left unconnected.
This feature has been designed for use in applications such as routers, where signal
crosstalk and circuit noise cause the Equalizer to output erroneous data when no input
signal is present. The use of a Carrier Detect function with a fixed internal reference
GS2974A HD-LINX™ III Adaptive Cable Equalizer
Data Sheet
42216 - 3
January 2009
10 of 16
Free Datasheet http://www.datasheet4u.com/

10 Page





PáginasTotal 16 Páginas
PDF Descargar[ GS2974A.PDF ]

Enlace url


Hoja de datos destacado

Número de piezaDescripciónFabricantes
GS2974AHD-LINX III Adaptive Cable EqualizerGennum
Gennum
GS2974BHD-LINX III Adaptive Cable EqualizerGennum
Gennum

Número de piezaDescripciónFabricantes
SSM2604

Low Power Audio Codec.

Analog Devices
Analog Devices
SLG3NB3331

32.768 kHz and MHz GreenCLK.

Silego
Silego
SLA6805M

High Voltage 3 phase Motor Driver IC.

Sanken
Sanken
SDC1742

12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters.

Analog Devices
Analog Devices
SDC1741

12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters.

Analog Devices
Analog Devices


DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares,
permitiéndote verlos en linea o descargarlos en PDF.


Index : 0  1  2  3  4  5  6  7  8  9  A  B  C  D  E  F  G  H  I  J  K  L  M  N  O  P  Q  R  S  T  U  V  W  X  Y  Z


www.DataSheet.es    |   2018   |  Contacto  |  Buscar