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Pin Descriptions (Continued)
V
REF
a
This is the positive analog voltage reference in-
put. In order to maintain accuracy the voltage
range of V
REF
(V
REF
e
V
REF
a
b
V
REF
b
)is
1V
DC
to 3.3 V
DC
and the voltage at V
REF
a
cannot exceed V
A
a
. See
Figure 4
for recom-
mended bypassing.
V
REF
b
The negative voltage reference input. In order
to maintain accuracy the voltage at this pin
must not go below GND or exceed V
A
a
. (See
Figure 4
).
V
A
a
,V
D
a
These are the analog and digital power supply
pins. V
A
a
and V
D
a
are not connected together
on the chip. These pins should be tied to the
same power supply and bypassed separately
(see
Figure 4
). The operating voltage range of
V
A
a
and V
D
a
is 3.0 V
DC
to 5.5 V
DC
.
DGND This is the digital ground pin (see
Figure 4
).
AGND This is the analog ground pin (see
Figure 4
).
TL/H/11830– 34
FIGURE 3. Protecting the MUXOUT1, MUXOUT2, A/DIN1 and A/DIN2 Analog Pins
TL/H/11830– 35
*Tantalum
**Monolithic Ceramic or better
FIGURE 4. Recommended Power Supply Bypassing and Grounding
21