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PDF GS2993 Data sheet ( Hoja de datos )
| Número de pieza | GS2993 | |
| Descripción | Dual Output Adaptive Cable Equalizer | |
| Fabricantes | Semtech | |
| Logotipo |  |
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GS2993
Dual Output Adaptive Cable Equalizer
Key Features
• SMPTE 424M, SMPTE 292M and SMPTE 259M
compliant
• Automatic cable equalization
• Multi-standard operation from 143Mb/s to 2.97Gb/s
• Performance optimized for 270Mb/s, 1.485Gb/s and
2.97Gb/s. Typical equalized length of Belden 1694A
cable:
140m at 2.97Gb/s
220m at 1.485Gb/s
400m at 270Mb/s
• Supports DVB-ASI at 270Mb/s
• Dual, independently-controlled outputs
• Manual bypass (useful for low data rates with slow
rise/fall times)
• Programmable carrier detect with squelch threshold
adjustment
• Automatic power-down on loss of signal
Standby power <30mW (typical)
• Differential outputs support DC coupling to 1.2V, 2.5V
or 3.3V CML logic
• 0/6 dB gain boost selection pin
• Cable Length Indicator output; varies monotonically
with input cable length
• Selectable de-emphasis: 2dB, 4dB and 6dB
• Standard EIA/JEDEC logic control and status signal
levels
• Single 3.3V power supply operation
• 207mW power consumption (typical)
• Wide operating temperature range of -40ºC to +85ºC
• Small footprint QFN package (4mm x 4mm)
• Pb-free and RoHS compliant
Applications
• SMPTE 424M, SMPTE 292M and SMPTE 259M coaxial
cable serial digital interfaces
Description
The GS2993 is a high-speed BiCMOS integrated circuit
designed to equalize and restore signals received over 75Ω
coaxial cable.
The device is designed to support SMPTE 424M,
SMPTE292M and SMPTE 259M, and is optimized for
performance at 270Mb/s, 1.485Gb/s and 2.97Gb/s.
The GS2993 features DC restoration to compensate for the
DC content of SMPTE pathological test patterns.
The Carrier Detect output pin (CD) indicates whether a
valid input signal has been detected. It can be connected
directly to the SLEEP pin to enable automatic power-down
upon loss of carrier. A voltage programmable threshold,
which can be changed via the SQ_ADJ pin, forces CD high
when the input signal amplitude falls below the threshold.
This allows the GS2993 to distinguish between
low-amplitude SDI signals and noise at the input of the
device.
The equalizing and DC restore stages are disengaged when
the BYPASS pin is HIGH. No equalization occurs in Bypass
mode.
The GS2993 includes a gain selection pin (GAIN_SEL)
which, when tied HIGH, compensates for 6dB flat
attenuation.
The differential outputs can be DC-coupled to Gennum
3.3V cable drivers and reclockers, and to industry-standard
1.2V, 2.5V, and 3.3V CML logic by connecting the
respective VCCO to 1.2V, 2.5V or 3.3V.
The GS2993 also includes programmable de-emphasis with
three operating levels in order to support long PCB traces.
The device is available in a 24-pin, 4mm x 4mm QFN
package.
Power consumption of the GS2993 is typically 207mW.
The GS2993 is Pb-free, and the encapsulation compound
does not contain halogenated flame retardant.
This component and all homogeneous subcomponents are
RoHS compliant.
GS2993 Dual Output Adaptive Cable Equalizer
Data Sheet
53966 - 4
August 2012
www.semtech.com
1 of 23
Propietary & Confidential
1 page  
Table 1-1: GS2993 Pin Descriptions (Continued)
Pin Number
8
Name
BYPASS
Timing
Not
Synchronous
Type
Input
9
SQ_ADJ
Analog
Input
10 OP2_EN
Input
11
OP2_CTL
Not
Input
Synchronous
12
VCC_02
Analog
Power
13, 14
15
SDO2,
SDO2
VEE_02
Analog
Analog
Output
Power
16
VEE_01
Analog
Power
17, 18
19
SDO1,
SDO1
VCC_01
Analog
Analog
Output
Power
Description
Core Bypass control signal input.
Forces the equalizing and DC restore stages into Bypass mode when
HIGH. No equalization occurs in this mode.
Includes an internal pull-down resistor.
Squelch Threshold Adjust.
Adjusts the input signal amplitude threshold of the carrier detect
function. The output can be muted when the input signal
amplitude is too low by connecting the CD and OP_CTL pins
together through some external components. In this case, when CD
is LOW (0V), OP1_CTL and/or OP2_CTL are forced LOW (0V), and
when CD is HIGH (2.5V), OP1_CTL and/or OP2_CTL are forced HIGH
(3.3V). The input level at which the part is muted can be set through
the SQ_ADJ pin through suitable voltage variances as described in
Section 4.4. NOTE: when the SQ_ADJ functionality is used and/or in
auto_mute, the auto sleep feature is not allowed, and the SLEEP pin
should be left open.
Includes an internal pull-down resistor.
Output 2 Enable.
When HIGH, Output 2 is operational.
When LOW, Output 2 is powered-down and the outputs are both at
VCC_O2.
Includes an internal pull down resistor.
CONTROL SIGNAL INPUT
Controls the Output Swing, De-emphasis, and Mute features of SDO
and SDO from output 2.
When connected to GND, the output swing is 800mV with no
de-emphasis. When connected to the 3.3V analog power supply, the
output is MUTED.
Includes an internal pull down resistor.
See Section 4.7 for all other control options.
Most positive power supply connection for the output buffer for
output 2.
Connect to 1.2 – 3.3V.
Equalized serial digital differential output 2.
Most negative power supply connection for the output buffer for
output 2.
Connect to GND.
Most negative power supply connection for the output buffer for
output 1.
Connect to GND.
Equalized serial digital differential output.
Most positive power supply connection for the output buffer for
output 1.
Connect to 1.2 – 3.3V.
GS2993 Dual Output Adaptive Cable Equalizer
Data Sheet
53966 - 4
August 2012
5 of 23
Propietary & Confidential
5 Page 
3. Input/Output Circuits
4k
SDI
5.25k
4k
SDI
SQ_ADJ
+
-
RC
5.25k
82.4k
Figure 3-1: Input Equivalent Circuit
Figure 3-2: SQ_ADJ Equivalent Circuit
SDO
50
50
SDO
Figure 3-3: Output Circuit
100kΩ
OP1_EN
SLEEP,
OP2_EN
BYPASS,
GAIN_SEL
100kΩ
Figure 3-4: OP1_EN Circuit
Figure 3-5: SLEEP, OP2_EN, BYPASS,
and GAIN_SEL Circuit
GS2993 Dual Output Adaptive Cable Equalizer
Data Sheet
53966 - 4
August 2012
CD
Figure 3-6: CD Circuit
11 of 23
Propietary & Confidential
11 Page | ||
| Páginas | Total 23 Páginas | |
| PDF Descargar | [ Datasheet GS2993.PDF ] | |
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