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PDF GS1578A Data sheet ( Hoja de datos )
| Número de pieza | GS1578A | |
| Descripción | HD-LINX-R II Multi-Rate Dual Slew-Rate Cable Driver | |
| Fabricantes | Gennum Corporation | |
| Logotipo |  |
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GS1578A HD-LINX® II
Multi-Rate Dual Slew-Rate Cable Driver
GS1578A Data Sheet
Features
• 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® II family
products
• Single 3.3V power supply operation
• Operating temperature range: 0°C to 70°C
Applications
• SMPTE 292M, SMPTE 344M and SMPTE 259M
Coaxial Cable Serial Digital Interfaces.
Description
The GS1578A is a second generation high-speed
BiCMOS integrated circuit designed to drive one or two
75Ω co-axial cables.
The GS1578A may drive data rates up to 1.485Gb/s
and provides two selectable slew rates in order to
achieve compliance to SMPTE 259M, SMPTE 344M
and SMPTE 292M.
The GS1578A 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 GS1578A is Pb-free, and the
encapsulation compound does not contain halogenated
flame retardant.
This component and all homogeneous subcomponents
are RoHS compliant.
BANDGAP REFERENCE AND BIASING CIRCUIT
RSET
SDI INPUT
DIFFERENTIAL
PAIR
SDI
OUTPUT STAGE &
CONTROL
SDO
SDO
SD/HD
Functional Block Diagram
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Temperature
230˚C
220˚C
183˚C
150˚C
100˚C
3˚C/sec max
GS1578A Data Sheet
60-150 sec.
10-20 sec.
6˚C/sec max
25˚C
120 sec. max
6 min. max
Figure 2-2: Standard Pb Reflow Profile (Pb-free package)
2.3 DC Electrical Characteristics
Time
Table 2-1: DC Electrical Characteristics
VDD = 3.3V, TA = 0°C to 70°C, unless otherwise shown
Parameter
Supply Voltage
Power Consumption
Supply Current
Output Voltage
Input Voltage
SD/HD Input
Symbol
VCC
PD
Is
VCMOUT
VCMIN
VIH
VIL
Conditions
–
TA = 25°C
TA = 25°C
Common mode
Common mode
–
–
Min
3.135
–
–
–
1.6 + ΔVSDI/2
2.4
–
Typ
3.3
168
51
VCC - VOUT
–
–
–
Max
3.465
–
64
–
VCC - ΔVSDI/2
–
0.8
Units
V
mW
mA
V
V
V
V
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GS1578A Data Sheet
4.3 Output Return Loss Measurement
To perform a practical return loss measurement, it is necessary to force the
GS1578A 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 GS1578A is set to 800mVp-p with a tolerance of ±7%
using an RSET resistor of 750Ω. A ±1% SMT resistor should be used.
The RSET resistor is part of the high speed output circuit of the GS1578A. 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 750Ω ±1% should be used. Using other values for
RSET is not recommended.
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| PDF Descargar | [ Datasheet GS1578A.PDF ] | |
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