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GS6042 Schematic ( PDF Datasheet ) - Semtech

Teilenummer GS6042
Beschreibung 6G UHD-SDI/3G/HD/SD Adaptive Cable Equalizer
Hersteller Semtech
Logo Semtech Logo 




Gesamt 21 Seiten
GS6042 Datasheet, Funktion
Gennum Products
GS6042
6G UHD-SDI/3G/HD/SD Adaptive
Cable Equalizer
Key Features
Supports data rates from 125Mb/s to 6.25Gb/s
SMPTE ST 2081 (proposed), SMPTE ST 424,
SMPTE ST 292, and SMPTE ST 259 compliant
Automatic cable equalization
Typical equalized length of Belden 1694A cable:
Š 80m at 5.94Gb/s
Š 210m at 2.97Gb/s
Š 300m at 1.485Gb/s
Š 500m at 270Mb/s
Supports DVB-ASI at 270Mb/s
Supports MADI at 125Mb/s
Manual bypass control
Programmable carrier detect with squelch threshold
adjustment
Automatic power-down on loss of signal
Differential output supports DC-coupling from +1.2V
to +3.3V CML logic
Optional 6dB flat band gain on input
Selectable output de-emphasis: 2dB, 6dB, and 8dB
Standard EIA/JEDEC logic for control/status signals
Single +3.3V power supply operation
180mW power consumption (35mW in sleep)
Operating temperature range: -40ºC to +85ºC
Small footprint QFN package (4mm x 4mm)
Š Footprint compatible with the GS2974A, GS2974B,
GS2984, GS2994, and GS3440
Pb-free and RoHS compliant
Applications
SMPTE ST 2081 (proposed), SMPTE ST 424,
SMPTE ST 292, and SMPTE ST 259 coaxial cable serial
digital interfaces
Serialized 8b/10b encoded video streams up to
6.25Gb/s
Description
The GS6042 is a high-speed BiCMOS device designed to
optimally equalize and restore signals received over 75Ω
coaxial cable.
The device supports data rates up to 6.25Gb/s while being
optimized for the proposed SMPTE ST 2081, as well as
SMPTE ST 424, SMPTE ST 292, and SMPTE ST 259.
The GS6042 features DC restoration to compensate for the
DC content of SMPTE pathological signals.
The Carrier Detect output pin (CD) indicates whether an
input signal has been detected. It can be connected
directly to the SLEEP pin to enable automatic sleep on loss
of input.
A CD threshold is set via the SQ_ADJ pin, allowing the
GS6042 to distinguish between small amplitude SDI signals
and noise at the input of the device.
The equalizing and DC restore stages are disengaged and
no equalization occurs when the BYPASS pin is HIGH. This is
useful for signals launched at the signal source with low
data rates and/or slow rise/fall times.
The GS6042 features a gain selection pin (GAIN_SEL) which
can be used to compensate for 6dB flat attenuation prior to
the input of the device.
The differential output can be DC-coupled to Semtech’s
reclockers and cable drivers, as well as industry-standard
CML logic by changing the voltage applied to the
VCC_O pin. In general, DC-coupling to any termination
voltage between +1.2V and +3.3V is supported.
The GS6042 also features programmable output
de-emphasis with three user-selectable operating levels to
support long PCB traces at the output of the device.
Power consumption of the GS6042 is typically 180mW
when its output is DC-coupled at +1.2V.
The GS6042 is Pb-free, and the encapsulation compound
does not contain halogenated flame retardant. This
component and all homogeneous subcomponents are
RoHS compliant.
GS6042
Final Data Sheet
PDS-060055
Rev. 3
May 2014
www.semtech.com
1 of 21
Proprietary and Confidential






GS6042 Datasheet, Funktion
2. Electrical Characteristics
2.1 Absolute Maximum Ratings
Table 2-1: Absolute Maximum Ratings
Parameter
Value
Supply Voltage - Core/Output Driver
-0.5V to +3.6V DC
Input ESD Voltage (HBM)
5kV
Storage Temperature Range (Ts)
-50°C to +125°C
Input Voltage Range (any input)
-0.3 to (VCC_A +0.3)V
Operating Temperature Range
-40°C to +85°C
Solder Reflow Temperature
260°C
Note: Absolute Maximum Ratings are those values beyond which damage may occur.
Functional operation outside of the ranges shown in the AC and DC Electrical Characteristics
is not guaranteed.
2.2 DC Electrical Characteristics
Table 2-2: DC Electrical Characteristics
VCC_A = +3.3V ±5%, TA = -40°C to +85°C, unless otherwise shown.
Parameter
Symbol Conditions
Supply Voltage - Core
VCC_A
Supply Voltage - Output Driver
VCC_O
Min Typ Max Units Notes
3.135 3.3 3.465 V —
1.14 1.2 1.26 V 1
2.375 2.5 2.625 V
1
3.135 3.3 3.465 V
1
GS6042
Final Data Sheet
PDS-060055
Rev. 3
May 2014
www.semtech.com
6 of 21
Proprietary and Confidential

6 Page









GS6042 pdf, datenblatt
Table 4-1: Typical Common Mode Output Voltage Levels (VCMOUT)
Supply
Voltage
(VCC_O)
Termination Type 1 (See Figure 4-1) (See 1)
425mVppd Swing
850mVppd Swing
3.3V 3.19V
2.5V 2.39V
3.09V
2.29V
1.8V 1.69V
1.59V
1.2V 1.09V
0.99V
Note:
1. The values shown for termination type 1 only apply when VTERM = VCC_O
Termination Type 2 (See Figure 4-2)
425mVppd Swing
3.09V
2.29V
1.59V
0.99V
850mVppd Swing
2.88V
2.08V
1.38V
0.78V
GS6042 VCC_O
VV
TERM TERM
50Ω 50Ω
50Ω 50Ω
DDO
50Ω
DDO
50Ω
GS6042 VCC_O
50Ω 50Ω
DDO
50Ω
DDO
50Ω
100Ω
Figure 4-1: 50Ω Termination to VTERM
Figure 4-2: 100Ω Parallel Output Termination
4.4 Programmable Squelch Adjust (SQ_ADJ)
The GS6042 features a programmable Squelch Adjust (SQ_ADJ) threshold.
This feature can be useful in applications where there are multiple input channels using
the GS6042 and the maximum gain of each device must be limited to avoid crosstalk.
The SQ_ADJ pin acts to change the threshold of the Carrier Detect (CD) pin. When the
input signal level drops below the threshold set by SQ_ADJ, the CD pin will be driven
HIGH, indicating that there is not a valid input signal.
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 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.
In applications where programmable squelch adjust is not required, the SQ_ADJ pin can
be left unconnected.
Note: When using SQ_ADJ to limit the maximum gain of the GS6042, CD should not be
connected to SLEEP.
GS6042
Final Data Sheet
PDS-060055
Rev. 3
May 2014
www.semtech.com
12 of 21
Proprietary and Confidential

12 Page





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