GS2978 HD-LINX® III Multi-Rate Dual Slew-Rate Cable Driver
Features
•
•
•
•
•
•
•
SMPTE 424M, SMPTE 292M, SMPTE 344M and SMPTE
259M compliant
Dual coaxial cable driving outputs with selectable
slew rate
50Ω differential PECL input
Pb-free and RoHS compliant
Seamless interface to other HD-LINX® III family
products
Single 3.3V power supply operation
Operating temperature range: 0°C to 70°C
Description
The GS2978 is a high-speed BiCMOS integrated circuit
designed to drive one or two 75Ω co-axial cables.
The GS2978 may drive data rates up to 2.97Gb/s and
provides two selectable slew rates in order to achieve
compliance to SMPTE 424M, SMPTE 259M, SMPTE 344M
and SMPTE 292M.
The GS2978 accepts a LVPECL level differential input that
may be AC coupled. External biasing resistors at the inputs
are not required.
Power consumption is typically 168mW using a 3.3V
power supply. The GS2978 is Pb-free, and the
encapsulation compound does not contain halogenated
flame retardant.
This component and all homogeneous subcomponents are
RoHS compliant.
Applications
•
SMPTE 424M, SMPTE 292M, SMPTE 344M and SMPTE
259M Coaxial Cable Serial Digital Interfaces.
BANDGAP REFERENCE AND BIASING CIRCUIT
R
SET
DDI
DDI
INPUT
DIFFERENTIAL
PAIR
SDO
OUTPUT STAGE &
CONTROL
SDO
SD/HD
DISABLE
Functional Block Diagram
GS2978
HD-LINX® III Multi-Rate Dual Slew-Rate Cable Driver
Data Sheet
37186 - 7
March 2009
www.gennum.com
1 of 15
Revision History
Version
7
ECR
151357
PCN
−
Date
March 2009
Changes and/or Modifications
Added 2.5k reel option to section
6.6 Ordering Information.
Added
maximum power consumption value to
Table 2-1: DC Electrical
Characteristics.
Updated data sheet format. Added Tape & Reel Part Number to
6.6
Ordering Information.
Changed
minimum value of differential input signal amplitude in
Section
4.1.
Changed
Input Voltage
Swing
in
Table 2-2: AC Electrical
Characteristics.
6
150277
−
−
−
−
41693
–
August 2008
5
147849
October 2007
4
147552
September
2007
July 2007
April 2007
November 2006
3
2
1
146309
144827
142318
Corrected
part number typo in
Ordering Information on page 14.
Added
Table 4-1: RSET vs. VOD.
Converting
to Data
Sheet.
Added section
6.4
Solder
Reflow Profiles.
Added typical ORL values in
AC Electrical
Characteristics.
Changed
to Preliminary Data
Sheet.
Removed references to trial
publication for
SMPTE
424M. Modified I
IH
/I
IL
conditions to 10μA in
DC
Electrical
Characteristics
and additive jitter in
AC Electrical
Characteristics.
Added section
4.3 Output Return Loss Measurement.
Corrected
pad standoff height and tolerances for pad width & package
dimension.
Corrected
pad shape.
New document.
0
140608
–
May 2006
B
139766
–
March 2006
A
138454
–
February 2006
GS2978
HD-LINX® III Multi-Rate Dual Slew-Rate Cable Driver
Data Sheet
37186 - 7
March 2009
2 of 15
Contents
Features.................................................................................................................................................................1
Applications.........................................................................................................................................................1
Description...........................................................................................................................................................1
Revision History .................................................................................................................................................2
1. Pin Out...............................................................................................................................................................4
1.1 Pin Assignment ..................................................................................................................................4
1.2 Pin Descriptions ................................................................................................................................4
2. Electrical Characteristics ............................................................................................................................5
2.1 Absolute Maximum Ratings ..........................................................................................................5
2.2 DC Electrical Characteristics ........................................................................................................5
2.3 AC Electrical Characteristics ........................................................................................................6
3. Input/Output Circuits ..................................................................................................................................7
4. Detailed Description.....................................................................................................................................8
4.1 Input Interfacing ...............................................................................................................................8
4.2 Output Interfacing ...........................................................................................................................8
4.2.1 Output Amplitude (RSET) ..................................................................................................9
4.2.2 Output Disable.......................................................................................................................9
4.3 Output Return Loss Measurement ..............................................................................................9
5. Application Information .......................................................................................................................... 10
5.1 PCB Layout ....................................................................................................................................... 10
5.2 Typical Application Circuit ........................................................................................................ 10
6. Package & Ordering Information .......................................................................................................... 11
6.1 Package Dimensions ..................................................................................................................... 11
6.2 Recommended PCB Footprint ................................................................................................... 12
6.3 Packaging Data ............................................................................................................................... 12
6.4 Solder Reflow Profiles .................................................................................................................. 13
6.5 Marking Diagram ........................................................................................................................... 14
6.6 Ordering Information ................................................................................................................... 14
GS2978
HD-LINX® III Multi-Rate Dual Slew-Rate Cable Driver
Data Sheet
37186 - 7
March 2009
3 of 15
1. Pin Out
1.1 Pin Assignment
NC
NC
NC
NC
13
12
SDO
11
GS2978
(top view)
V
EE
3
10
SD/HD
16
DDI
1
15
14
DDI
2
SDO
RSET
4
5
NC
6
DISABLE
7
RSVD
8
9
VCC
Center Pad
(bottom of package)
Figure 1-1: 16-Pin QFN
1.2 Pin Descriptions
Table 1-1: Pin Descriptions
Pin Number
1,2
3
4
5,8,13,14,
15,16
7
6
Name
DDI, DDI
V
EE
R
SET
NC
Timing
Analog
–
Analog
–
NC
Type
Input
Power
Input
–
Description
Serial
digital differential input.
Most negative power supply connection.
Connect
to
GND.
External output amplitude control resistor.
No
Connect.
Not bonded internally.
RSVD
DISABLE
–
Non
Synchronous
Reserved
Input
Do not connect.
Serial
output disable. When asserted LOW, the
SDO/SDO
output
driver is powered off.
SDO/SDO
will float to V
CC
through the pull-up
resistor.
Most positive power supply connection.
Connect
to +3.3V.
Output slew rate control. When set HIGH, the output will meet
SMPTE
259M rise/fall time specifications. When set LOW, the serial
outputs will meet
SMPTE424M
and
SMPTE
292M rise/fall time
specifications.
9
10
V
CC
SD/HD
–
Non
Synchronous
Power
Input
GS2978
HD-LINX® III Multi-Rate Dual Slew-Rate Cable Driver
Data Sheet
37186 - 7
March 2009
4 of 15
Table 1-1: Pin Descriptions
Pin Number
11,12
–
Name
SDO, SDO
Center
Pad
Timing
Analog
–
Type
Output
Power
Description
Serial
digital differential output.
Connect
to most negative power supply plane following the
recommendations in
Recommended PCB Footprint on page 12.
2. Electrical Characteristics
2.1 Absolute Maximum Ratings
Parameter
Supply
Voltage
Input ESD Voltage
Storage
Temperature Range
Input Voltage Range (any input)
Operating Temperature Range
Solder
Reflow Temperature
Value
-0.5V to 3.6 V
DC
4kV
-50°C < T
s
< 125°C
-0.3 to (V
CC
+0.3)V
0°C to 70°C
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.
2.2 DC Electrical Characteristics
Table 2-1: DC Electrical Characteristics
V
CC
= 3.3V ±5%; T
A
= 0°C to 70°C, unless otherwise shown
Parameter
Supply
Voltage
Power
Consumption
Symbol
V
CC
P
D
Conditions
–
T
A
= 25°C,
SDO/SDO
enabled
T
A
= 25°C,
SDO/SDO
disabled
Min
3.135
–
Typ
3.3
168
Max
3.465
180
Units
V
mW
–
96
–
mW
Supply Current
I
s
T
A
= 25°C,
SDO/SDO
enabled
T
A
= 25°C,
SDO/SDO
disabled
–
51
–
mA
–
29
–
mA
Output Voltage
V
CMOUT
Common
mode
–
V
CC
- V
OUT
–
V
GS2978
HD-LINX® III Multi-Rate Dual Slew-Rate Cable Driver
Data Sheet
37186 - 7
March 2009
5 of 15
京公网安备 11010802033920号
EEWORLD
