Pin descriptions – Rainbow Electronics ADC12L038 User Manual
Page 21
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
1 V
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
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