GS1679 Datasheet PDF - Gennum
| Part Number | GS1679 | |
| Description | Cable Driver | |
| Manufacturers | Gennum | |
| Logo |  |
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GS1679 Cable Driver with HD/SD Capability
The GS1679 is a high-speed BiCMOS integrated circuit designed to drive one to four 75Ω coaxial cables. The GS1679 can
drive data rates up to 1.485Gb/s, and provides two selectable slew rates in order to achieve compliance to SMPTE 292M,
SMPTE 259M and SMPTE 344M.
The GS1679 accepts industry-standard differential input levels, including LVPECL and CML. The DISABLE1 and DISABLE2
pins power-down the first and second output drivers respectively, leaving the serial data output in a high-impedance state.
The GS1679 features an adjustable output swing using an external bias resistor. The single-ended output swing is adjustable
from 600mVpp to 1200mVpp. The GS1679 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 GS1679 is forward footprint-compatible with Gennum's 3G GS2989, allowing for an easier migration of HD designs to
3G.
Key Features
• SMPTE 292M, SMPTE 259M and SMPTE 344M
compliant
• Supports data rates from 270Mb/s to 1.485Gb/s
• Supports DVB-ASI at 270Mb/s
• Dual differential coaxial-cable-driving outputs
selectable slew rates
adjustable output swing from 600mVpp to
1200mVpp
DISABLE control
• Wide common-mode range input buffer
100mV sensitivity
Supports DC-coupling to industry-standard
differential logic
on-chip 100Ω differential data input termination
• 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)
• Pb-free and RoHS compliant
• Forward pin-compatible with Gennum's 3G GS2989
Typical Application Circuit
VCC
VCC_Term
10n 10n
10n GND
75R 5n6*
GND
SDO1 12
4u7
75R
4u7
2 DDI
SDO1 11
75R
VCC_Term
75R
5n6*
4u7
VCC
3 DDI
GS1679
10n GND
75R 5n6*
4u7
5 RSET
R*
10
SDO2
SDO2 9
4u7
75R
75R
VCC_Term
75R
5n6*
4u7
*Customer to choose resistor value.
GND
GND
10n
NOTE: All resistors in Ohms, capacitors in Farads,
and inductors in Henrys, unless otherwise stated.
* Typical value: varies with layout, and represents a trade-off
between good eye shape and output return loss.
5n6 is the optimum value for an 800mV output swing
and 3.3V operation.
4n7 is the optimum value for an 800mV output swing and
2.5V operation.
6n8 is the optimum value for an 1200mV output swing.
GS1679 Cable Driver with HD/SD Capability
Data Sheet
54175 - 1
March 2011
www.gennum.com
1 of 16
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2.2 DC Electrical Characteristics
Table 2-1: DC Electrical Characteristics
VCC = 3.3V ±5% or 2.5V ±5%; TA = -40°C to +85°C, unless otherwise shown
Parameter
Symbol Conditions
Min
Typ
Max
Units Notes
Supply Voltage
VCC 3.3V Typical
2.5V Typical
3.135 3.3 3.465
2.375 2.5 2.625
Power Consumption
(2.5V)
PD SDO1/SDO1 enabled,
SDO2/SDO2 disabled
–
110 130
SDO1/SDO1 and
SDO2/SDO2 enabled
–
180 215
SDO1/SDO1 and
–35
SDO2/SDO2 disabled
Power Consumption
(3.3V)
SDO1/SDO1 enabled,
SDO2/SDO2 disabled
–
155 183
SDO1/SDO1 and
SDO2/SDO2 enabled
–
250 300
SDO1/SDO1 and
–46
SDO2/SDO2 disabled
Supply Current
IS 1 channel, VCC = 3.3V
1 channel, VCC = 2.5V
–
–
47 53
44 50
2 channels, VCC = 3.3V
–
76 87
2 channels, VCC = 2.5V
–
72 82
Power-down
– 1 1.8
Output Voltage
VCMOUT Common mode
– VCC - VOUT –
Input Voltage
VCMIN Common mode
1.4 + ΔVDDI/2 – VCC - ΔVDDI/2
SD/HD, DISABLE
VIH IIH <= 150μA
1.7 –
–
VIL IIL <= 150μA
– – 0.8
OSP Drive Strength
––
2––
NOTES:
1. Power consumed in GS1679 only. Termination resistors draw extra current with output swing = 800mV.
V
V
mW
mW
mW
mW
mW
mW
mA
mA
mA
mA
mA
V
V
V
V
mA
–
–
1
1
1
1
1
1
1
1
1
1
1
–
–
–
–
–
GS1679 Cable Driver with HD/SD Capability
Data Sheet
54175 - 1
March 2011
5 of 16
Preview 5 Page |
Part DetailsOn this page, you can learn information such as the schematic, equivalent, pinout, replacement, circuit, and manual for GS1679 electronic component. |
| Information | Total 16 Pages | |
| Link URL | [ Copy URL to Clipboard ] | |
| Download | [ GS1679.PDF Datasheet ] | |
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