tc7107a Microchip Technology Inc., tc7107a Datasheet - Page 20

• Manufacturer Part Number: tc7107a
• Description: 3-1/2 Digit Analog-to-digital Converters
• Manufacturer: Microchip Technology Inc.

TC7106/A/TC7107/A
FIGURE 10-2:
Ratiometric Resistance Measurement
FIGURE 10-3:
FIGURE 10-4:
Coefficient Resistor Temperature Sensor
DS21455C-page 20
0.7%/°C
R
UNKNOWN
R
PTC
STANDARD
160kΩ
1N4148
Sensor
50kΩ
5.6kΩ
1N914
R
R
3
2
300kΩ
20kΩ
20kΩ
V
Analog
Common
V
V
V
50kΩ
REF
IN
IN
REF
R
R
TC7106A
+
-
R
1
2
+
-
1
Low Parts Count
Temperature Sensor
Positive Temperature
V+
160kΩ
300kΩ
V
V
V
V
Common
LCD Display
V
V
V
V
Common
V+
IN
IN
REF
REF
V+
IN
IN
REF
REF
-
+
TC7106A
-
+
+
-
+
TC7106A
+
-
+
V
FS
= 2V
9V
9V
V-
V-
FIGURE 10-5:
Reference: 200mV Full Scale, 3 Readings-Per-
Second (RPS)
FIGURE 10-6:
200mV Full Scale, 3RPS, V
Single Ended Inputs
TC7106A
TC7107A
To Pin 1
To Pin 1
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
21
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
21
0.47μF
0.22μF
0.22μF
0.47μF
To Display
To Display
0.1μF
0.1μF
TC7106A, Using the Internal
TC7107 Internal Reference:
© 2006 Microchip Technology Inc.
100kΩ
To Backplane
100kΩ
100pF
100pF
Set V
1kΩ
Set V
1kΩ
IN
47kΩ
47kΩ
- Tied to GND for
0.01μF
REF
0.01μF
REF
= 100mV
22kΩ
1MΩ
= 100mV
22kΩ
1MΩ
+
–
+
–
IN
9V
+
–
+5V
-5V
IN