EL5325 Ver la hoja de datos (PDF) - Intersil
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EL5325 Datasheet PDF : 11 Pages
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Block Diagram
EL5325
REFERENCE HIGH
OUTA
OUTB
EIGHT
CHANNEL
MEMORY
VOLTAGE
SOURCES
OUTJ
OUTK
CLK
SDI
LOAD
CONTROL IF
OUTL
REFERENCE LOW
REFERENCE DECOUPLE
SDO
FILTER
CHANNEL OUTPUTS
Each of the channel outputs has a rail-to-rail buffer. This
enables all channels to have the capability to drive to within
50mV of the power rails, (see Electrical Characteristics for
details).
When driving large capacitive loads, a series resistor should
be placed in series with the output. (Usually between 5Ω and
50Ω).
Each of the channels is updated on a continuous cycle, the
time for the new data to appear at a specific output will
depend on the exact timing relationship of the incoming data
to this cycle.
The best-case scenario is when the data has just been
captured and then passed on to the output stage
immediately; this can be as short as 48µs. In the worst-case
scenario this will be 576µs when the data has just missed
the cycle.
When a large change in output voltage is required, the
change will occur in 2V steps, thus the requisite number of
timing cycles will be added to the overall update time. This
means that a large change of 16V can take between 4.6ms
to 5.2ms depending on the absolute timing relative to the
update cycle.
EXT_OSC
POWER DISSIPATION AND THERMAL SHUTDOWN
With the 30mA maximum continues output drive capability
for each channel, it is possible to exceed the 125°C absolute
maximum junction temperature. Therefore, it is important to
calculate the maximum junction temperature for the
application to determine if load conditions need to be
modified for the part to remain in the safe operation.
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
• PDMAX = Maximum power dissipation in the package
The maximum power dissipation actually produced by the IC
is the total quiescent supply current times the total power
supply voltage and plus the power in the IC due to the loads.
PDMAX = VS × IS + Σ[(VS - VOUTi ) × ILOADi]
8
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