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PDF GS1674 Data sheet ( Hoja de datos )
| Número de pieza | GS1674 | |
| Descripción | Adaptive Cable Equalizer | |
| Fabricantes | Semtech | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de GS1674 (archivo pdf) en la parte inferior de esta página. Total 16 Páginas | ||
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GS1674
GS1674 Adaptive Cable Equalizer
The GS1674 is a high-speed BiCMOS integrated circuit designed to equalize and restore signals received over 75Ω coaxial
cable. The device is optimized for performance at 270Mb/s and 1.485Gb/s, and 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 MUTE pin to mute the output on loss of carrier. The sensitivity of the carrier detect can be easily programmed to allow
the GS1674 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 GS1674 is footprint and drop-in compatible with existing GS1574A and LMH0044 designs, with no additional
application changes required.
Key Features
• Replaces the LMH0044
• SMPTE 292M, SMPTE 344M and SMPTE 259M
compliant
• Automatic cable equalization
• Performance optimized for 270Mb/s and 1.485Gb/s.
Typical equalized length of Belden 1694A cable:
220m at 1.485Gb/s
400m at 270Mb/s
• Supports DVB-ASI at 270Mb/s
• Manual bypass (useful for low data rates with slow
rise/fall times)
• Programmable carrier detect with squelch threshold
adjustment
• Standard EIA/JEDEC logic control and status signal
levels
• Single 3.3V power supply operation
• 195mW power consumption (typical)
• Wide temperature range of -40ºC to +85ºC
• Small footprint QFN package (4mm x 4mm)
• Drop-in compatible with the GS1574A. Forward
compatible with Gennum's 3G EQ products.
• Pb-free and RoHS compliant
Typical Application Circuit
CD
MUTE
VCC VCC
6.8nH*
SDI
75Ω
10nF
1µF
1µF
16 15 14 13
1
VEE_A
2 SDI
3
SDI
GS1674
VEE_D 12
11
SDO
10
SDO
10nF
75Ω 37.4Ω
4
VEE_A
9
VEE_D
4.7µF
+
+
4.7µF
56
78
1µF
SQ_ADJ
BYPASS
NOTE: All resistors in Ohms, capacitors in Farads,
and inductors in Henrys, unless otherwise noted.
* Value dependent on layout
GS1674 Adaptive Cable Equalizer
Data Sheet
54168 - 2
September 2012
www.semtech.com
SDO
SDO
1 of 16
1 page  
2. Electrical Characteristics
2.1 Absolute Maximum Ratings
Parameter
Supply Voltage
Input ESD Voltage (HBM)
Storage Temperature Range
Input Voltage Range (any input)
Operating Temperature Range
Functional Temperature Range
Solder Reflow Temperature
Value
-0.5V to +3.6V DC
5kV
-50°C < Ts < 125°C
-0.3 to (VCC +0.3)V
-20°C to +85°C
-40°C to +85°C
260°C
2.2 DC Electrical Characteristics
Table 2-1: DC Electrical Characteristics
VCC = 3.3V ±5%, TA = -20°C to +85°C, unless otherwise shown
Parameter
Symbol Conditions
Supply Voltage
Power Consumption
Supply Current
Output Common Mode
Voltage
Input Common Mode Voltage
SQ_ADJ DC Voltage (to mute
signal)
SQ_ADJ Range
CD Output Voltage
Mute Input Voltage Required
to Force Outputs to Mute
Mute Input Voltage Required
to Force Outputs Active
VCC
PD
Is
VCMOUT
–
TA = 25°C
TA = 25°C
TA = 25°C
VCMIN
–
TA = 25°C
0m, TA = 25°C
–
VCD(OH)
VCD(OL)
VMute
TA = 25°C
Carrier not
present
Carrier present
Min to Mute
VMute
Max to
Activate
Min
3.135
–
–
–
–
–
–
2.4
–
2.0
–
Typ
3.3
195
59
VCC - (ΔVSDO)/2
1.8
3.2
0.9
–
–
–
–
Max
3.465
250
–
–
–
–
–
–
0.4
–
0.8
Units
V
mW
mA
V
Notes
–
–
–
–
V–
V–
V–
V–
V–
V–
V–
GS1674 Adaptive Cable Equalizer
Data Sheet
54168 - 2
September 2012
5 of 16
5 Page 
4. Application Information
4.1 High-Gain Adaptive Cable Equalizers
The GS1674 is Gennum's latest HD-optimized adaptive cable equalizer. In order to
continue to extend the cable length that an equalizer will remain operational over, it is
necessary to have high-gain in the equalizer.
A video cable equalizer must provide wide band gain over a range of frequencies in
order to accommodate the range of data rates and signal patterns that are present in a
SMPTE compliant serial video stream.
The GS1674 has an increase in gain over the GS1574A at critical HD frequencies, and
because of this, the GS1674 may be sensitive to signals at the input that the GS1574A will
not be sensitive to.
Small levels of signal or noise present at the input pins of the Equalizer may cause
chatter at the output. In order to prevent this from happening, particular attention must
be paid to board layout.
4.2 PCB Layout
Special attention must be paid to component layout when designing Serial Digital
Interfaces for HDTV. An FR-4 dielectric can be used, however, controlled impedance
transmission lines are required for PCB traces longer than approximately 1cm. Note the
following PCB artwork features used to optimize performance:
• The PCB ground plane is removed under the GS1674 input components to minimize
parasitic capacitance
• The PCB ground plane is removed under the GS1674 output components to
minimize parasitic capacitance
• High-speed traces are curved to minimize impedance changes
4.3 Typical Application Circuit
CD
MUTE
VCC VCC
6.8nH*
SDI
75Ω
10nF
1µF
1µF
16 15 14 13
1
VEE_A
2 SDI
3
SDI
GS1674
VEE_D 12
11
SDO
10
SDO
10nF
75Ω 37.4Ω
4
VEE_A
9
VEE_D
4.7µF
+
+
4.7µF
56
78
1µF
SQ_ADJ
BYPASS
NOTE: All resistors in Ohms, capacitors in Farads,
and inductors in Henrys, unless otherwise noted.
* Value dependent on layout
Figure 4-1: GS1674 Typical Application Circuit
SDO
SDO
GS1674 Adaptive Cable Equalizer
Data Sheet
54168 - 2
September 2012
11 of 16
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet GS1674.PDF ] | |
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