Rainbow Electronics ADC12138 - Manual (Page 23)

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