QPRO Technical Data Sheet
Document 1137-0901, REV A
12
4 Customer Input/Output Interfaces (External)
4.1
Analog Inputs
Two available: Pins 22 and 23
•
0 – 3.5 Volts.
•
12 bit resolution
•
Greater than 1M
Ω
input impedance
•
3dB bandwidth and 160 kHz if driven with low impedance
Figure 4-1, Analog Input Circuit
4.1.1 Sample Circuits for appropriate Scaling to 0-3.5V
Analog inputs are 12 bits and have a Full Scale (F
scale
) reading of 4095. The equation below can be used to
determine the resistor values for varying maximum sensor voltage readings
.
(
)
2
2
1
5
.
3
R
R
R
Voltage
Scale
Full
V
s
F
+
=
=
12V = VFs
(SENSOR)
8.66K, 10mW
3.57K, 10mW
ANA 0 OR ANA 1
R1
3.5V
R2
C
O
N
F
I
D
E
N
T
I
A
L
In
fo
rm
a
ti
o
n
c
la
s
s
if
ie
d
C
o
n
fi
d
e
n
ti
a
l
-
D
o
n
o
t
c
o
p
y
(
S
e
e
l
a
s
t
p
a
g
e
f
o
r
o
b
lig
a
ti
o
n
s
)