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PDF GS2989 Data sheet ( Hoja de datos )
| Número de pieza | GS2989 | |
| Descripción | Dual-Output Cable Driver | |
| Fabricantes | Gennum | |
| Logotipo |  |
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GS2989 Dual-Slew-Rate, Dual-Output 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
100mV sensitivity
supports DC-coupling to industry-standard
differential logic
on-chip 100Ω differential data input termination
• Input signal trace equalization
• Dual differential coaxial-cable-driving outputs
selectable slew rates
adjustable output swing from 500mVpp to
1800mVpp
independent DISABLE controls for each output
• 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)
new dual-output pin out
use the GS2988 for a single-output variant that is
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 GS2989 is a high-speed BiCMOS integrated circuit
designed to drive one to four 75Ω coaxial cables.
The GS2989 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 GS2989 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 DISABLE1 and DISABLE2 pins power-down the first
and second output drivers respectively, leaving the serial
data outputs in a high-impedance state. When applied
simultaneously, the entire device is powered-down.
The GS2989 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
GS2989.
The GS2989 can be powered from either a 3.3V or a 2.5V
supply. Power consumption is typically 110mW using a
2.5V power supply with one output enabled.
The GS2989 is Pb-free, and the encapsulation compound
does not contain halogenated flame retardant.
This component and all homogeneous subcomponents are
RoHS compliant.
GS2989 Dual-Slew-Rate, Dual-Output Cable Driver
with 3Gb/s Capability
Data Sheet
52133 - 4
December 2010
www.gennum.com
1 of 19
1 page  
Table 1-1: Pin Descriptions
Pin Number Name
Type
Description
7*
DISABLE2
Input
Control signal input.
When set LOW, the second serial data output is disabled (powered-down) and the
SDO2/SDO2 pins are set to high-impedance.
When set HIGH, the SDO2/SDO2 pins will output a serial data signal.
NOTE: if this pin is left floating, the second serial data output will be disabled.
9,10
SDO2/
Output Serial data differential output of second output buffer.
SDO2
11,12
SDO1/
SDO1
Output Serial data differential output of first output buffer.
14 OSP 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.
15
SD/HD
Input
Control signal input.
When set HIGH, the serial data outputs will meet the SMPTE 259M rise/fall time
specification.
When set LOW, the serial outputs will meet the SMPTE 292M and SMPTE 424M rise/fall
time specification.
NOTE: if this pin is left floating, the serial data outputs will meet the SMPTE 259M
rise/fall time specification.
16
EQ_EN
Input
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.
– Center Pad Power Connect to most negative power supply plane following the recommendations in
Recommended PCB Footprint on page 17.
*NOTE: When pins 6 and 7 are driven LOW together (or similarly when pin 6 is driven LOW while pin 7 is left floating), the
entire device is powered-down. In this state, minimum power consumption occurs.
GS2989 Dual-Slew-Rate, Dual-Output Cable Driver
with 3Gb/s Capability
Data Sheet
52133 - 4
December 2010
5 of 19
5 Page 
Control of the slew rate is determined by the setting of the SD/HD input pin.
Table 4-2: Slew Rate Selection
SD/HD
0
1
Floating
Rise/Fall Time
SMPTE 424M & 292M compliant
SMPTE 259M compliant
SMPTE 259M compliant
4.4 Output Disable
The GS2989 supports an output disable function for each serial data differential output.
Control of this function is determined by the setting of the DISABLE1 and DISABLE2
control pins.
The serial output disables (DISABLE1 and DISABLE2), disable power to the current mode
serial data output drivers. When asserted LOW, the SDO/SDO output drivers are
powered-down.
Table 4-3: Output Disable
DISABLE1
0
0
1 or Floating
1 or Floating
Floating
DISABLE2
0 or Floating
1
0 or Floating
1
Floating
SDO1/SDO1
SDO2/SDO2
All Chip Power Down
High-Impedance
Operational
Operational
High-Impedance
Operational
Operational
Operational
High-Impedance
When DISABLE1 and DISABLE2 are driven LOW simultaneously, the entire device is
powered down, and the power consumption is minimized.
4.5 Output Signal Presence Indicator (OSP)
The GS2989 supports an output signal presence indicator function.
The output signal presence pin (OSP) is an active-low output that indicates when a valid
output signal has been detected at the pre-driver output.
The output signal presence function measures signal-edge energy to indicate that the
pre-driver to the serial data outputs is toggling.
GS2989 Dual-Slew-Rate, Dual-Output Cable Driver
with 3Gb/s Capability
Data Sheet
52133 - 4
December 2010
11 of 19
11 Page | ||
| Páginas | Total 19 Páginas | |
| PDF Descargar | [ Datasheet GS2989.PDF ] | |
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