The HA4314B is a very wide bandwidth 4 x 1 crosspoint
switch ideal for professional video switching, HDTV,
computer monitor routing, and other high performance
applications. The circuit features very low power dissipation
(105mW Enabled, 4mW Disabled), excellentdifferential gain
and phase, and very high off isolation. When disabled, the
output is switched to a high impedance state, making the
HA4314B ideal for routing matrix equipment.
The HA4314B requires no external current source, and
features fast switching and symmetric slew rates.
For a 4 x 1 crosspoint with Tally outputs (channel indicators)
or with synchronous control signals, please refer to the
HA4404B and HA4344B data sheets, respectively.
For audio channels requiring larger signal swings, please
refer to the CD74HC22106 (8 x 8), CD22M3493 (12 x 8),
and CD22M3494 (16 x 8) data sheets.
Ordering Information
TEMP.
PART NUMBER
HA4314BCP0 to 7014 Ld PDIPE14.3
HA4314BCB0 to 7014 Ld SOICM14.15
HA4314BCB960 to 7014 LdSOIC Tapeand
HA4314BCA0 to 7016 Ld SSOPM16.15A
HA4314BCA960 to 7016 Ld SSOP Tape
CAUTION: Stresses above those listed in “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress only rating and operation of the
device at these or any other conditions above those indicated in the operational sections of this specification is not implied.
NOTES:
1. θJA is measured with the component mounted on an evaluation PC board in free air.
2. If an input signal is applied before the supplies are powered up, the input current must be limited to these maximum values.
The frequency response of this circuit depends greatly on
the care taken in designing the PC board. The use of low
inductance components such as chip resistors and chip
capacitors is strongly recommended, while a solid
ground plane is a must!
Attention should be given to decoupling the power supplies.
A large value (10µF) tantalum in parallel with a small value
(0.1µF) chip capacitor works well in most cases.
Keep input and output traces as short as possible, because
trace inductance and capacitance can easily become the
performance limiting items.
Application Information
General
The HA4314B is a 4 x 1 crosspoint switch that is ideal forthe
matrix element of high performance switchers and routers.
This crosspoint’s low input capacitance and high input
resistance provide excellent video terminations when used
with an external 75Ω resistor. Nevertheless, if several
HA4314B inputs are connected together, the use of an input
buffer should be considered (see Figure 1). This crosspoint
contains no feedback or gain setting resistors, so the output
is a true high impedance load when the IC is disabled
(
CS = 1).
Ground Connections
All GND pins are connected to a common point on the die,
so any one of them will suffice as the functional GND
connection. For the best isolation and crosstalk rejection,
however, all GND pins must connect to the GND plane.
Frequency Response
Most applications utilizing the HA4314B require a series
output resistor,R
, to tune the response for the specific load
S
3
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