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PDF GS2988 Datasheet ( Hoja de datos )

Número de pieza GS2988
Descripción Dual-Slew-Rate / Cable Driver
Fabricantes Gennum 
Logotipo Gennum Logotipo

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GS2988 Hoja de datos, Descripción, Manual
GS2988 Dual-Slew-Rate, Cable Driver with 3Gb/s Capability
Features
• SMPTE 424M, SMPTE 292M and SMPTE 259M
compliant
• Supports DVB-ASI at 270Mb/s
• Supports data rates from 270Mb/s to 2.97Gb/s
• Wide common-mode range input buffer
Š 100mV sensitivity
Š supports DC-coupling to industry-standard
differential logic
Š on-chip 100Ω differential data input termination
• Input signal trace equalization
• Differential coaxial-cable-driving output
Š selectable slew rates
Š adjustable output swing from 500mVpp to
1800mVpp
Š DISABLE control
• Robust output signal presence function
• Excellent output eye quality
• Power supply operation at 3.3V or 2.5V
• 110mW power consumption (2.5V supply)
• Operating temperature range: -40°C to +85°C
• Small footprint QFN package (4mm x 4mm)
Š Drop-in compatible to the GS2978
• Pb-free and RoHS compliant
Applications
• SMPTE 424M, SMPTE 292M and SMPTE 259M coaxial
cable serial digital interfaces
Description
The GS2988 is a high-speed BiCMOS integrated circuit
designed to drive one to two 75Ω coaxial cables.
The GS2988 may drive data rates up to 2.97Gb/s and
provides two selectable slew rates in order to achieve
compliance to SMPTE 424M, SMPTE 292M and SMPTE
259M.
The GS2988 accepts industry-standard differential input
levels including LVPECL and CML.
Input trace equalization compensates for up to 10 inches of
FR4 trace loss while in HD and 3G modes. This feature can
be disabled using the EQ_EN pin.
The DISABLE pin powers-down the entire device.
The GS2988 features adjustable output swing using an
external bias resistor. The single-ended output swing is
adjustable from 500mVpp to 1800mVpp.
An output signal presence function, the OSP pin, indicates
whether an active signal is present at the output of the
GS2988.
The GS2988 can be powered from either a 3.3V or a 2.5V
supply. Power consumption is typically 110mW using a
2.5V power supply.
The GS2988 is Pb-free, and the encapsulation compound
does not contain halogenated flame retardant.
This component and all homogeneous subcomponents are
RoHS compliant.
GS2988 Dual-Slew-Rate, Cable Driver with 3Gb/s
Capability
Data Sheet
52131 - 4
December 2010
www.gennum.com
1 of 17
Free Datasheet http://www.datasheet4u.net/

1 page

GS2988 pdf
Table 1-1: Pin Descriptions
Pin Number
10
11, 12
14
16
Name
SD/HD
Type
Input
SDO/
SDO
OSP
Output
Output
EQ_EN
Input
Center Pad Power
Description
Control signal input.
When set HIGH, the serial data output will meet the SMPTE 259M rise/fall time
specification.
When set LOW, the serial output will meet the SMPTE 292M and SMPTE 424M rise/fall
time specification.
NOTE: if this pin is left floating, the serial data output will meet the SMPTE 259M
rise/fall time specification.
Serial data differential output.
Output signal presence status signal output.
Signal levels are LVCMOS/LVTTL compatible.
Indicates presence of a valid output signal.
When the OSP pin is LOW, a good input signal has been detected within the output
stage pre-driver.
When this pin is HIGH, the output signal is invalid at the output of the pre-driver.
Control signal input.
When set LOW, trace-equalization is turned ON.
When set HIGH, trace-equalization is turned OFF.
NOTE 1: if this pin is left floating, trace-equalization is turned OFF.
NOTE 2: this pin must be pulled HIGH or left floating for operation in SD mode.
Connect to most negative power supply plane following the recommendations in
Recommended PCB Footprint on page 15.
2. Electrical Characteristics
2.1 Absolute Maximum Ratings
Parameter
Value
Supply Voltage
-0.5V to 3.6 VDC
Input ESD Voltage
2.5kV
Storage Temperature Range
-50°C < Ts < 125°C
Input Voltage Range (any input)
-0.3 to (VCC +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 to the device may
occur. Functional operation under these conditions or at any other condition beyond those
indicated in the AC/DC Electrical Characteristic sections is not implied.
GS2988 Dual-Slew-Rate, Cable Driver with 3Gb/s
Capability
Data Sheet
52131 - 4
December 2010
5 of 17
Free Datasheet http://www.datasheet4u.net/

5 Page

GS2988 arduino
The RSET resistor is part of an internal DC feedback loop in the GS2988. The resistor
should be placed as close as possible to the RSET pin, and connected directly to the VCC
plane (traces/wires may cause instability). In addition, the PCB capacitance should be
minimized at this node by removing the PCB groundplane beneath the RSET resistor and
the RSET pin.
NOTE: Care should be taken when considering layout of the RSET resistor. Please refer
to Section 5.1 for more details.
2.0
1.75
1.5
1.25
1.0
0.75
0.5
0.25
0.250
0.500
0.750
1.0
1.25
1.5
RSET (kΩ)
Figure 4-1: VOUT vs. RSET
In order to determine the best starting value for Rset, the following formula should be
used:
Rset = 8*(Rtrm/VoutppSE)
Where VoutppSE is in Volts, and both resistances are in Ω.
Rtrm is the value of the termination resistors, which should be equal to the
characteristic impedance of the cable, and is typically 75Ω.
The cable must be short (1m), and terminated at both ends for the formula to be valid.
Example: For a 75Ω cable, Rtrm = 75Ω (at both ends), VoutppSE = 800mV
Rset = 8*(75/0.8) = 750Ω
GS2988 Dual-Slew-Rate, Cable Driver with 3Gb/s
Capability
Data Sheet
52131 - 4
December 2010
11 of 17
Free Datasheet http://www.datasheet4u.net/

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