Rainbow Electronics ADC12L038 - 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
21