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GS9078A HD-LINX(R) II Multi-Rate Cable Driver
GS9078A Data Sheet Features * * * * * * * SMPTE 259M and SMPTE 344M compliant Dual coaxial cable driving outputs with selectable slew rate 50 differential PECL input Pb-free and RoHS compliant Seamless interface to other HD-LINX(R) II family products Single 3.3V power supply operation Operating temperature range: 0C to 70C Description The GS9078A is a second generation high-speed BiCMOS integrated circuit designed to drive one or two 75 co-axial cables. The GS9078A may drive data rates up to 540Mb/s and provides two selectable slew rates in order to achieve compliance to SMPTE 259M and SMPTE 344M. The GS9078A 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 GS9078A is Pb-free, and the encapsulation compound does not contain halogenated flame retardant. This component and all homogeneous subcomponents are RoHS compliant.
Applications * SMPTE 259M and SMPTE 344M Coaxial Cable Serial Digital Interfaces.
BANDGAP REFERENCE AND BIASING CIRCUIT
RSET
SDI SDI
INPUT DIFFERENTIAL PAIR
SDO OUTPUT STAGE & CONTROL SDO
Functional Block Diagram
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GS9078A Data Sheet
Contents
1. Pin Out ......................................................................................................................3 1.1 Pin Assignment ...............................................................................................3 1.2 Pin Descriptions ..............................................................................................3 2. Electrical Characteristics ...........................................................................................4 2.1 Absolute Maximum Ratings ............................................................................4 2.2 Solder Reflow Profiles .....................................................................................4 2.3 DC Electrical Characteristics ..........................................................................5 2.4 AC Electrical Characteristics ...........................................................................6 3. Input / Output Circuits ...............................................................................................7 4. Detailed Description ..................................................................................................8 4.1 Input Interfacing ..............................................................................................8 4.2 Output Interfacing ...........................................................................................8 4.3 Output Return Loss Measurement ................................................................10 4.4 Output Amplitude (RSET) .............................................................................10 5. Application Information............................................................................................11 5.1 PCB Layout ...................................................................................................11 5.2 Typical Application Circuit .............................................................................11 6. Package & Ordering Information .............................................................................12 6.1 Package Dimensions ....................................................................................12 6.2 Recommended PCB Footprint ......................................................................13 6.3 Packaging Data .............................................................................................13 6.4 Ordering Information .....................................................................................13 7. Revision History ......................................................................................................14
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GS9078A Data Sheet
1. Pin Out
1.1 Pin Assignment
NC NC NC NC 13 12 SDO 11 GS9078A (top view) VEE 3 10 NC
16 SDI 1
15
14
SDI
2
SDO
RSET
4 5 NC 6 NC 7 NC 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 5,6,7,8,10, 13,14,15,16 9 11,12 -
Name
SDI, SDI VEE RSET NC VCC SDO, SDO Center Pad
Timing
Analog - Analog - - Analog -
Type
Input Power Input - Power Output Power
Description
Serial digital differential input. Most negative power supply connection. Connect to GND. External output amplitude control resistor. No Connect. Not bonded internally. Most positive power supply connection. Connect to +3.3V. Serial digital differential output. Connect to most negative power supply plane following the recommendations in Recommended PCB Footprint on page 13.
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GS9078A Data Sheet
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 Reflow Temperature
Value
-0.5V to 3.6 VDC 2kV -50C < Ts < 125C -0.3 to (VCC +0.3)V 0C to 70C 260C
2.2 Solder Reflow Profiles
The device is manufactured with Matte-Sn terminations and is compatible with both standard eutectic and Pb-free solder reflow profiles. MSL qualification was performed using the maximum Pb-free reflow profile shown in Figure 2-1.The recommended standard Pb reflow profile is shown in Figure 2-2.
Temperature 60-150 sec.
20-40 sec. 260C 250C 3C/sec max 217C 6C/sec max
200C
150C
25C
Time 60-180 sec. max 8 min. max
Figure 2-1: Maximum Pb-free Solder Reflow Profile (Preferred)
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GS9078A Data Sheet
Temperature
60-150 sec.
10-20 sec. 230C 220C 3C/sec max 183C 6C/sec max 150C
100C
25C Time 120 sec. max 6 min. max
Figure 2-2: Standard Pb Reflow Profile (Pb-free package)
2.3 DC Electrical Characteristics
Table 2-1: DC Electrical Characteristics
VDD = 3.3V, TA = 0C to 70C, unless otherwise shown
Parameter
Supply Voltage Power Consumption Supply Current Output Voltage Input Voltage
Symbol
VCC PD Is VCMOUT VCMIN
Conditions
- TA = 25C TA = 25C Common mode Common mode
Min
3.135 - - - 1.6 + VSDI/2
Typ
3.3 168 51 VCC - VOUT -
Max
3.465 - 64 - VCC - VSDI/2
Units
V mW mA V V
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GS9078A Data Sheet
2.4 AC Electrical Characteristics
Table 2-2: AC Electrical Characteristics
VDD = 3.3V, TA = 0C to 70C, unless otherwise shown
Parameter
Serial input data rate Additive jitter Rise/Fall time Mismatch in rise/fall time Duty cycle distortion Overshoot Output Return Loss Output Voltage Swing
Symbol
DRSDO - tr, tf tr, - - ORL VOUT tf
Conditions
- - - - - - - Single Ended into 75 external load RSET = 750
Min
- - 400 - - - 15 750
Typ
- 20 - - - - - 800
Max
540 - 800 30 100 8 - 850
Units
Mb/s psp-p ps ps ps % dB mVp-p
Notes
1 - 2 - - - - -
Input Voltage Swing NOTES:
VSDI
Differential
300
-
2200
mVp-p
-
1. The input coupling capacitor must be set accordingly for lower data rates. 2. Rise/Fall time measured between 20% and 80%.
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GS9078A Data Sheet
3. Input / Output Circuits
VCC
SDI
SDI
VCC 10k 5k 10k
10k
Figure 3-1: Differential Input Stage (SDI/SDI)
Vcc
SDO SDO
IREF
Figure 3-2: Differential Output Stage (SDO/SDO)
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GS9078A Data Sheet
4. Detailed Description
4.1 Input Interfacing
SDI/SDI are high impedance differential inputs. The equivalent input circuit is shown in Figure 3-1. Several conditions must be observed when interfacing to these inputs: * * * The differential input signal amplitude must be between 300 and 2000mVpp. The common mode voltage range must be as specified in the DC Electrical Characteristics on page 5. For input trace lengths longer than approximately 1cm, the inputs should be terminated as shown in the Typical Application Circuit.
The GS9078A inputs are self-biased, allowing for simple AC coupling to the device. For serial digital video, a minimum capacitor value of 4.7F should be used to allow coupling of pathological test signals. A tantalum capacitor is recommended.
4.2 Output Interfacing
The GS9078A outputs are current mode, and will drive 800mV into a 75 load. These outputs are protected from accidental static damage with internal static protection diodes. The SMPTE 344M and SMPTE 259M standards require that the output of a cable driver have a source impedance of 75 and a return loss of at least 15dB between 5MHz and 540MHz. In order for an SDI output circuit using the GS9078A to meet this specification, the output application circuit shown in Typical Application Circuit on page 11 is recommended. The value of LCOMP will vary depending on the PCB layout, with a typical value of 5.6nH. A 4.7F capacitor is used for AC coupling the output of the device. This value is chosen to ensure that pathological signals can be coupled without a significant DC component occurring. Please see Application Information on page 11 for more details.
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GS9078A Data Sheet
Figure 4-1: Output signal for 270Mb/s input
The output protection diodes act as a varactor (voltage controlled capacitor) as shown in Figure 4-2. Therefore, when measuring return loss at the GS9078A output, it is necessary to take the measurement for both a logic high and a logic low output condition. Consequently, the output capacitance of the device is dependent on the logic state of the output.
GS9078A
SDO
SDO
Figure 4-2: Static Protection Diodes
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GS9078A Data Sheet
4.3 Output Return Loss Measurement
To perform a practical return loss measurement, it is necessary to force the GS9078A output to a DC high or low condition. The actual measured return loss will be based on the outputs being static at VCC or VCC-1.6V. Under normal operating conditions the outputs of the device swing between VCC-0.4V and VCC-1.2V, so the measured value of return loss will not represent the actual operating return loss. A simple method of calculating the values of actual operating return loss is to interpolate the two return loss measurements. In this way, the values of return loss are estimated at VCC-0.4V and VCC-1.2V based on the measurements at VCC and VCC-1.6V. The two values of return loss (high and low) will typically differ by several decibels. If the measured return loss is RH for logic high and RL for logic low, then the two values can be interpolated as follows: RIH = RH- (RH-RL)/4 and RIL = RL+(RH-RL)/4 where RIH is the interpolated logic high value and RIL is the interpolated logic low value. For example, if RH = -18dB and RL = -14dB, then the interpolated values are RIH = -17dB and RIL = -15dB.
4.4 Output Amplitude (RSET)
The output amplitude of the GS9078A is set to 800mVp-p with a tolerance of 7% using an RSET resistor of 750. A 1% SMT resistor should be used. The RSET resistor is part of the high speed output circuit of the GS9078A. The resistor should be placed as close as possible to the RSET pin. 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: Only an RSET value of 750 1% should be used. Using other values for RSET is not recommended.
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GS9078A Data Sheet
5. Application Information
5.1 PCB Layout
Special attention must be paid to component layout when designing serial digital interfaces for SDTV. 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 trace width for SD rate signals is closely matched to SMT component width to minimize reflections due to changes in trace impedance. The PCB groundplane is removed under the GS9078A output components to minimize parasitic capacitance. The PCB ground plane is removed under the GS9078A RSET pin and resistor to minimize parasitic capacitance. Input and output BNC connectors are surface mounted in-line to eliminate a transmission line stub caused by a BNC mounting via high speed traces which are curved to minimize impedance variations due to change of PCB trace width.
5.2 Typical Application Circuit
* 5.6n 75 49.9 DIFFERENTIAL DATA INPUT 10n 49.9 1 2 3 4 GS9078A SDI SDI VEE RSET SDO SDO VCC 12 11 9 75 75 75 * 5.6n VCC 750 VCC 10n BNC 4u7 VCC
BNC 4u7 10n
4u7
4u7
* TYPICAL VALUE: VARIES WITH LAYOUT
NOTE: All resistors in Ohms, capacitors in Farads, and inductors in Henrys, unless otherwise noted.
Figure 5-1: Typical Application Circuit
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GS9078A Data Sheet
6. Package & Ordering Information
6.1 Package Dimensions
0.40+/-0.05 4.00+/-0.05
A
DATUM A
2.76+/-0.10
B
PIN 1 AREA
4.00+/-0.05
CENTER TAB
DETAIL B
2X 2X
0.15 C 0.15 C DATUM B 0.65 16X
0.20 REF
0.35+/-0.05 0.10 CAB 0.05 C
C
0.10 C 16X 0.08 C SEATING PLANE
0.85+/-0.05 0.00-0.05
DATUM A OR B
0.65/2 TERMINAL TIP 0.65 DETAIL B SCALE:NTS
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GS9078A Data Sheet
6.2 Recommended PCB Footprint
0.35 0.65
0.55
3.70
2.76
CENTER PAD
NOTE: All dimensions are in millimeters. 2.76 3.70
The Center Pad should be connected to the most negative power supply plane (VEE) by a minimum of 5 vias. NOTE: Suggested dimensions only. Final dimensions should conform to customer design rules and process optimizations.
6.3 Packaging Data
Parameter
Package Type Package Drawing Reference Moisture Sensitivity Level Junction to Case Thermal Resistance, j-c Junction to Air Thermal Resistance, j-a (at zero airflow) Psi Pb-free and RoHS compliant
Value
4mm x 4mm 16-pin QFN JEDEC M0220 3 31.0C/W 43.8C/W 11.0C/W Yes
6.4 Ordering Information
Part Number
GS9078A GS9078ACNE3
Package
16-pin QFN
Temperature Range
0C to 70C
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GS9078A Data Sheet
7. Revision History
Version
A 0
ECR
135926 136048
PCN
- -
Date
February 2005 February 2005
Changes and/or Modifications
New document. Converting to Preliminary Data Sheet. Added PCB Layout section. Updated Typical Application Circuit. Converted to Data Sheet. Changed title of Figure 2-2 to clarify that this is the Pb reflow profile. Updated Additive Jitter number in AC Electrical Characteristics table to be typically 20psp-p. Updated dimensions of the center pad of the PCB footprint in Section 6.2 to match the dimensions of the center pad of the device. Corrected part number in ordering information. Rephrased the RoHS Compliant statement. Corrected process to BiCMOS. Corrected Input Differential Swing to 2200mV. Corrected pad standoff height and tolerances for pad width & package dimension. Corrected pad shape.
1
136655
-
June 2005
2 3 4
137887 139115 139636
- 38124 38695
September 2005 January 2006 March 2006
CAUTION
ELECTROSTATIC SENSITIVE DEVICES DO NOT OPEN PACKAGES OR HANDLE EXCEPT AT A STATIC-FREE WORKSTATION DOCUMENT IDENTIFICATION
DATA SHEET
The product is in production. Gennum reserves the right to make changes to the product at any time without notice to improve reliability, function or design, in order to provide the best product possible.
GENNUM CORPORATION
Mailing Address: P.O. Box 489, Stn. A, Burlington, Ontario, Canada L7R 3Y3 Shipping Address: 970 Fraser Drive, Burlington, Ontario, Canada L7L 5P5 Tel. +1 (905) 632-2996 Fax. +1 (905) 632-5946
GENNUM JAPAN CORPORATION
Shinjuku Green Tower Building 27F, 6-14-1, Nishi Shinjuku, Shinjuku-ku, Tokyo, 160-0023 Japan Tel. +81 (03) 3349-5501, Fax. +81 (03) 3349-5505
GENNUM UK LIMITED
25 Long Garden Walk, Farnham, Surrey, England GU9 7HX Tel. +44 (0)1252 747 000 Fax +44 (0)1252 726 523 Gennum Corporation assumes no liability for any errors or omissions in this document, or for the use of the circuits or devices described herein. The sale of the circuit or device described herein does not imply any patent license, and Gennum makes no representation that the circuit or device is free from patent infringement. GENNUM and the G logo are registered trademarks of Gennum Corporation. (c) Copyright 2005 Gennum Corporation. All rights reserved. Printed in Canada. www.gennum.com
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