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PDF LMH0302 Data sheet ( Hoja de datos )
| Número de pieza | LMH0302 | |
| Descripción | 3Gbps HD/SD SDI Cable Driver | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de LMH0302 (archivo pdf) en la parte inferior de esta página. Total 8 Páginas | ||
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PRELIMINARY
April 2007
LMH0302
3Gbps HD/SD SDI Cable Driver
General Description
The LMH0302 3Gbps HD/SD SDI Cable Driver is designed
for use in SMPTE 424M, SMPTE 292M, SMPTE 344M, and
SMPTE 259M serial digital video applications. The LMH0302
drives 75Ω transmission lines (Belden 1694A, Belden 8281,
or equivalent) at data rates up to 2.97 Gbps.
The LMH0302 provides two selectable slew rates for SMPTE
259M and SMPTE 424M / 292M compliance. The output driv-
er may be powered down via the output diver enable pin.
The LMH0302 is powered from a single 3.3V supply. Power
consumption is typically 129 mW in SD mode and 162 mW in
HD mode. The LMH0302 is available in a 16-pin LLP pack-
age.
Features
■ SMPTE 424M, SMPTE 292M, SMPTE 344M, and SMPTE
259M compliant
■ Data rates to 2.97 Gbps
■ Differential input
■ 75Ω differential output
■ Selectable slew rate
■ Output driver power down control
■ Single 3.3V supply operation
■ Commercial operating temperature range: 0°C to +70°C
■ Typical power consumption: 129 mW in SD mode and 162
mW in HD mode
■ 16–pin LLP package
■ Footprint compatible with the LMH0002SQ
■ Replaces the Gennum GS2978
Applications
■ SMPTE 424M, SMPTE 292M, SMPTE 344M, and SMPTE
259M serial digital interfaces
■ Digital video routers and switches
■ Distribution amplifiers
Typical Application
© 2007 National Semiconductor Corporation 202146
20214602
www.national.com
1 page  
Device Operation
INPUT INTERFACING
The LMH0302 accepts either differential or single-ended in-
put. The inputs are self-biased, allowing for simple AC or DC
coupling. DC-coupled inputs must be kept within the specified
common-mode range.
OUTPUT INTERFACING
The LMH0302 uses current mode outputs. Single-ended out-
put levels are 800 mVP-P into 75Ω AC-coupled coaxial cable
with an RREF resistor of 750Ω. The RREF resistor is connected
between the RREF pin and VCC. The only resistor value that
should be used for RREF is 750Ω..
The RREF resistor should be placed as close as possible to
the RREF pin. In addition, the copper in the plane layers below
the RREF network should be removed to minimize parasitic
capacitance.
OUTPUT SLEW RATE CONTROL
The LMH0302 output rise and fall times are selectable for ei-
ther SMPTE 259M or SMPTE 424M / 292M compliance via
the SD/HD pin. For slower rise and fall times, or SMPTE 259M
compliance, SD/HD is set high. For faster rise and fall times,
or SMPTE 424M and SMPTE 292M compliance, SD/HD is
set low.
OUTPUT ENABLE
The SDO/SDO output driver can be enabled or disabled with
the ENABLE pin. When set low, the output driver is powered
off. ENABLE has an internal pullup.
5 www.national.com
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| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet LMH0302.PDF ] | |
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