Pin descriptions – Rainbow Electronics ADC12138 User Manual
Page 23
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Pin Descriptions
(Continued)
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 12079 – 30
FIGURE 3 Protecting the MUXOUT1 MUXOUT2
A DIN1 and A DIN2 Analog Pins
TL H 12079 – 31
Tantalum
Monolithic Ceramic or better
FIGURE 4 Recommended Power Supply Bypassing and Grounding
23
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