PRECISION ANALOG FRONT ENDS
TC500
TC500A
TC510
1
2
3
4
5
6
7
8
TC514
1
28
27
–
–
V
CAP
OUT
C
INT
0.33µF
1µF
2
1µF
DGND
C
+
5V
INT
TYPICAL WAVEFORMS
C
AZ
0.22µF
3
26
25
+
CAP
PIN 2
C
AZ
4
V
+5V
+
+5V
DD
BUF
V
IN
R
100k
22
INT
A0
5
6
ANALOG
MUX LOGIC
ACOM
19
23
PIN 23
10k
MICRO
CONTROLLER
A1
–
REF
C
CMPTR
C
REF
10k
10k
+
REF
0.22µF
C
22
21
7
9
8
A
B
PIN 2
–
IN
V
+
REF
V
TC05
PIN 23
C1, .01µF
18
13
–
V
+
+
CH1
INPUT 1
REF
TC514
–
–
CH1
INPUT 1
+
17
12
CH2
+
–
INPUT 2
INPUT 2
–
CH2
+
16
11
CH3
+
–
INPUT 3
INPUT 3
–
CH3
+
15
10
CH4
+
INPUT4
INPUT4
–
CH4
–
Figure 10. TC514 Design Example (See "Design Example")
+5V
25
1
1µF
1µF
28
26
+
18
13
–
OUT
+
–
+
V
CAP
CAP
CH1
V
DD
INPUT 1
–
–
CH1
CH2
10kΩ
+
17
+
INPUT 2
–
7
6
+
REF
C
12
16
11
–
CH2
0.22µF
0.01µF
–
REF
+
CH3
CH3
+
C
10k
10k
INPUT 3
–
–
+
REF
V
V
9
8
15
10
+
–
+
CH4
TC04
INPUT 4
–
CH4
TC514
–
REF
20
A0
ANALOG MUX
CONTROL LOGIC
19
22
21
100kΩ
0.22µF
A1
4
3
2
IBM
BUF
PRINTER PORT
2
C
A
B
AZ
PORT
0378
HEX
0.33µF
C
3
INT
10
23
CMPTR
5
ACOM
DGND
27
Figure 11. TC514 to IBM Compatible Printer Port
TELCOM SEMICONDUCTOR, INC.
3-33
TELCOM [ TELCOM SEMICONDUCTOR, INC ]
