10

Block Diagram

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 5

Ω and

50

Ω).

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 480µs for EL5226 and 576µs for

EL5236, 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 4.8ms

and 5.3ms for EL5226 and between 6.9ms to 7.48ms for

EL5236 depending on the absolute timing relative to the

update cycle.

POWER DISSIPATION

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:

where:

•

VOLTAGE

SOURCES

EIGHT

CHANNEL

MEMORY

CONTROL IF

OSCILLATOR

INPUT/OUTPUT

REFERENCE DECOUPLE

REFERENCE LOW

OUTL

OUTK

OUTJ

OUTB

OUTA

REFERENCE HIGH

OSCILLATOR

SELECT

FILTER

STD/REG

A0

Θ

JA

---------------------------------------------

=

EL5226, EL5326