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GS1679 Schematic ( PDF Datasheet ) - Gennum

Teilenummer GS1679
Beschreibung Cable Driver
Hersteller Gennum
Logo Gennum Logo 




Gesamt 16 Seiten
GS1679 Datasheet, Funktion
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
Š selectable slew rates
Š adjustable output swing from 600mVpp to
1200mVpp
Š DISABLE control
• 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
• 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






GS1679 Datasheet, Funktion
2.3 AC Electrical Characteristics
Table 2-2: AC 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
Serial input data rate
Additive jitter
DRSDO
1.485Gb/s
.27 – 1.485
– 10 –
– 270Mb/s
– 30 –
Rise/Fall time
Mismatch in rise/fall time
Duty cycle distortion
tr, tf
tr, tf
Utr, Utf
SD/HD=0
SD/HD=1
HD mode only
SD/HD=0
– – 135
400 – 800
– – 35
– – 20
Overshoot
Output Return Loss
SD/HD=1
SD/HD=0,
ORL –
– – 50
– – 10
17 19
Output Voltage Swing
Input Voltage Swing
VOUT
UVDDI
RSET = 750Ω
Differential
750 800 850
300 – 2000
Output Enable Delay
––
– – 100
Output Disable Delay
––
– – 80
NOTES:
1. The input coupling capacitor must be set accordingly for lower data rates.
2. Turning on input trace equalization will reduce jitter in most applications.
3. Rise/Fall time measured between 20% and 80% applies to 800mV output swing only.
4. Single-ended into a 75Ω external load.
5. Calculated as the actual positive bit-width compared to the expected positive bit-width using a 1010 pattern.
6. ORL depends on board design. The GS1679 achieves this specification on Gennum's evaluation boards.
Units
Gb/s
psp-p
psp-p
ps
ps
ps
ps
ps
%
dB
mVp-p
mVp-pd
ns
ns
Notes
1
2
2
3
3
4, 5
4, 5
4
6
4
GS1679 Cable Driver with HD/SD Capability
Data Sheet
54175 - 1
March 2011
6 of 16

6 Page









GS1679 pdf, datenblatt
6. Package & Ordering Information
6.1 Package Dimensions
4.00+/-0.05
A
B
DATUM A
2.76+/-0.10
PIN 1 AREA
2X 0.15 C
2X 0.15 C
0.10 C
16X
0.08 C
SEATING PLANE
CENTER TAB
DETAIL B
DATUM B
0.65
C
0.35+/-0.05
16X 0.10 C A B
0.05 C
DATUM A OR B
0.65/2
0.65
DETAIL B
SCALE:NTS
TERMINAL TIP
GS1679 Cable Driver with HD/SD Capability
Data Sheet
54175 - 1
March 2011
12 of 16

12 Page





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