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PDF ISL59112 Data sheet ( Hoja de datos )
| Número de pieza | ISL59112 | |
| Descripción | Rail-to-Rail Video Buffer | |
| Fabricantes | Intersil Corporation | |
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Data Sheet
August 15, 2005
ISL59112
FN6142.1
40MHz Rail-to-Rail Video Buffer
The ISL59112 is a single rail-to-rail 6dB video buffer with a
3dB roll-off frequency of 40MHz and a slew rate of 60V/µs.
Input signal DC restoration is accomplished with an internal
sync tip clamp. Operating from single supplies ranging from
+2.5V to +3.6V and sinking an ultra-low 2mA quiescent
current, the ISL59112 is ideally suited for low power, battery-
operated applications. It also features inputs capable of
reaching down to 0.15V below the negative rail. Additionally,
an enable high pin shuts the part down in under 20ns.
The ISL59112 is designed to meet the needs micropower
and bandwidth criteria inherent to battery operated
communication, instrumentation, and modern industrial
applications such as video on demand, cable set-top boxes,
DVD players, and HDTV. The ISL59112 is offered in a
space-saving SC-70 package guaranteed to a 1mm
maximum height constraint and specified for operation from
-40°C to +85°C temperature range.
Ordering Information
PART
NUMBER
(See Note)
PACKAGE
(Pb-Free)
TAPE &
REEL
PKG. DWG. #
ISL59112IEZ-T7 6-Pin SC-70 7” (3K pcs)
P6.049A
NOTE: Intersil Pb-free plus anneal products employ special Pb-free
material sets; molding compounds/die attach materials and 100%
matte tin plate termination finish, which are RoHS compliant and
compatible with both SnPb and Pb-free soldering operations. Intersil
Pb-free products are MSL classified at Pb-free peak reflow
temperatures that meet or exceed the Pb-free requirements of
IPC/JEDEC J STD-020.
Features
• 40MHz -3dB bandwidth
• 85V/µs slew rate
• Low supply current = 2mA
• Power-down current less than 1µA
• Supplies from 2.5V to 3.6V
• Rail-to-rail output
• Input to 0.15V below ground
• Internal sync tip clamp
• SAG correction reduces coupling capacitor size
• Pb-free plus anneal available (RoHS compliant)
Applications
• Video amplifiers
• Digital cameras
• Camera phones
• Portable/handheld products
• Communications devices
• Video on demand
• Cable set top box
• Satellite set top box
• DVD players
• HDTV
• Personal video recorders
Pinout
ISL59112
(6-PIN SC-70)*
TOP VIEW
IN+ 1 LPF
GND 2
+
-
6 V+
5 EN
SAG 3
4 OUT
*1mm MAXIMUM HEIGHT GUARANTEED
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 | Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright © Intersil Americas Inc. 2005. All Rights Reserved.
All other trademarks mentioned are the property of their respective owners.
1 page  
ISL59112
Output Drive Capability
The ISL59112 does not have internal short-circuit protection
circuitry. If the output is shorted indefinitely, the power
dissipation could easily overheat the die or the current could
eventually compromise metal integrity. Maximum reliability is
maintained if the output current never exceeds ±40mA. This
limit is set by the design of the internal metal interconnect.
Note that in transient applications, the part is robust.
Short-circuit protection can be provided externally with a
back match resistor in series with the output placed close as
possible to the output pin. In video applications this would be
a 75Ω resistor and will provide adequate short-circuit
protection to the device. Care should still be taken not to
stress the device with a short at the output.
Power Dissipation
With the high output drive capability of the ISL59112, it is
possible to exceed the 125°C absolute maximum junction
temperature under certain load current conditions.
Therefore, it is important to calculate the maximum junction
temperature for an application to determine if load conditions
or package types need to be modified to assure operation of
the amplifier in a safe operating area.
The maximum power dissipation allowed in a package is
determined according to:
PDMAX
=
T----J---M-----A----X-----–-----T----A---M-----A----X--
ΘJA
Where:
TJMAX = Maximum junction temperature
TAMAX = Maximum ambient temperature
ΘJA = Thermal resistance of the package
The maximum power dissipation actually produced by an IC
is the total quiescent supply current times the total power
supply voltage, plus the power in the IC due to the load, or
for sourcing:
PDMAX = VS × ISMAX + (VS – VOUTi) × -V----OR----UL----iT----i
for sinking:
PDMAX = VS × ISMAX + (VOUTi – VS) × ILOADi
Where:
VS = Supply voltage
ISMAX = Maximum quiescent supply current
VOUT = Maximum output voltage of the application
RLOAD = Load resistance tied to ground
ILOAD = Load current
By setting the two PDMAX equations equal to each other, we
can solve the output current and RLOAD to avoid the device
overheat.
Power Supply Bypassing Printed Circuit Board
Layout
As with any modern operational amplifier, a good printed
circuit board layout is necessary for optimum performance.
Lead lengths should be as short as possible. The power
supply pin must be well bypassed to reduce the risk of
oscillation. For normal single supply operation, where the
VS- pin is connected to the ground plane, a single 4.7µF
tantalum capacitor in parallel with a 0.1µF ceramic capacitor
from VS+ to GND will suffice. This same capacitor
combination should be placed at each supply pin to ground if
split supplies are to be used. In this case, the VS- pin
becomes the negative supply rail.
Printed Circuit Board Layout
For good AC performance, parasitic capacitance should be
kept to minimum. Use of wire wound resistors should be
avoided because of their additional series inductance. Use
of sockets should also be avoided if possible. Sockets add
parasitic inductance and capacitance that can result in
compromised performance. Minimizing parasitic capacitance
at the amplifier's inverting input pin is very important. The
feedback resistor should be placed very close to the
inverting input pin. Strip line design techniques are
recommended for the signal traces.
5 FN6142.1
August 15, 2005
5 Page | ||
| Páginas | Total 6 Páginas | |
| PDF Descargar | [ Datasheet ISL59112.PDF ] | |
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