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TC7136CLW713

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P22
© 2005 Microchip Technology Inc. DS21461C-page 1
TC7136/TC7136A
Features
• Fast Over Range Recovery, Ensured First Reading
Accuracy
• Low Temperature Drift Internal Reference
- TC7136: 70ppm/°C (Typ.)
- TC7136A: 35ppm/°C (Typ.)
• Zero Reading with Zero Input
• Low Noise: 15μV
P-P
• High Resolution: 0.05%
• Low Input Leakage Current: 1pA (Typ.)/10pA (Max.)
• Precision Null Detectors with True Polarity at Zero
• High-Impedance Differential Input
• Convenient 9V Battery Operation with Low Power
Dissipation: 500μW (Typ.)/900μW (Max.)
Applications
• Thermometry
• Bridge Readouts: Strain Gauges, Load Cells,
Null Detectors
• Digital Meters: Voltage/Current/Ohms/Power, pH
• Digital Scales, Process Monitors
• Portable Instrumentation
Device Selection Table
General Description
The TC7136 and TC7136A are low power, 3-1/2 digit
with liquid crystal display (LCD) drivers and analog-to-
digital converters. These devices incorporate an "inte-
grator output zero" phase, which enables over range
recovery. The performance of existing TC7126,
TC7126A and ICL7126 based systems may be
upgraded with minor changes to external, passive
components.
The TC7136A has an improved internal zener refer-
ence voltage circuit which maintains the analog com-
mon temperature drift to 35ppm/°C (typical) and
75ppm/°C (maximum). This represents an improve-
ment of two to four times over similar 3-1/2 digit con-
verters. The costly, space consuming external
reference source may be removed.
The TC7136 and TC7136A limit linearity error to less
than 1 count on 200mV or 2V full scale ranges. The roll-
over error (the difference in readings for equal magni-
tude, but opposite polarity input signals) is below ±1
count. High-impedance differential inputs offer 1pA
leakage currents and a 10
12
Ω input impedance. The
differential reference input allows ratiometric measure-
ments for ohms or bridge transducer measurements.
The 15μV
P-P
noise performance ensures a "rock solid"
reading. The auto-zero cycle enables a zero display
readout for a 0V input.
Part Number Package
Temperature
Range
TC7136 CPI 40-Pin PDIP 0°C to +70°C
TC7136 CKW 44-Pin PQFP 0°C to +70°C
TC7136 CLW 44-Pin PLCC 0°C to +70°C
TC7136A CPI 40-Pin PDIP 0°C to +70°C
TC7136A CKW 44-Pin PQFP 0°C to +70°C
TC7136A CLW 44-Pin PLCC 0°C to +70°C
Low Power 3-1/2 Digit Analog-to-Digital Converter
Obsolete Device
TC7136/TC7136A
DS21461C-page 2 © 2005 Microchip Technology Inc.
Package Type
TC7136CPL
TC7136ACPL
1
2
3
4
OSC1
5
6
7
8
9
10
11
12
TEST
V
REF
+
ANALOG
COMMON
C
AZ
V+
D
2
Normal Pin
Configuration
13
14
15
16
17
18
19
20
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
21
C
2
B
2
A
2
F
2
E
2
D
3
B
3
F
3
E
3
AB
4
10's
100's
1000's
100's
OSC2
OSC3
V
REF
-
C
REF
+
C
REF
-
V
IN
+
V
IN
-
V
BUFF
V
INT
V-
G
2
C
3
A
3
G
3
BP
(Backplane)
POL
(MINUS SIGN)
TC7136RCPL
TC7136ARCPL
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
100's
1000's
100's
Reverse Pin
Configuration
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
21
D
1
C
1
B
1
A
1
F
1
G
1
E
1
1's
V+
D
2
C
2
B
2
A
2
F
2
E
2
D
3
B
3
F
3
E
3
AB
4
POL
(Minus Sign)
D
1
C
1
B
1
A
1
F
1
G
1
E
1
1's
10's
OSC1
TEST
V
REF
+
ANALOG
COMMON
C
AZ
OSC2
OSC3
V
REF
-
C
REF
+
C
REF
-
V
IN
+
V
IN
-
V
BUFF
V
INT
V-
G
2
C
3
A
3
G
3
BP
(Backplane)
NC = No Internal Connection
27
28
29
30
31
32
33
7
4
3
2
1
NC
TC7136CKW
TC7136ACKW
12 13 14 15 17 18
G
2
44 43 42 41 39 3840
REF HI
ANALOG
COMMON
16
37
AZ
36
BUFF
35
INT
34
V-
19 20 21 22
D
3
26
8
25
9
24
10
23
11
IN HI
5
6
C
3
OSC3
TEST
NC
NC
V+
D
2
C
2
B
2
A
2
F
2
E
2
NC
OSC2
OSC1
REF LO
C
REF
+
C
REF
-
IN LO
A
3
G
3
BP
POL
AB
4
E
3
F
3
B
3
33
34
35
36
37
38
39
13
10
9
8
7
ANALOG
COMMON
REF LO
18 19 20 21 23 24
AB
4
POL
NC
BP
IN HI
NC
IN LO
B
2
6543 1442
A
1
OSC1
22
43
OSC2
42
OSC3
41
TEST
40
REF HI
25 26 27 28
F
3
E
3
G
3
A
3
C
3
G
2
3214
AZ
3115
BUFF
3016
INT
E
2
2917
D
3
NC
11
12
NC
C
2
D
2
F
2
A
2
B
3
TC7136CLW
TC7136ACLW
44-Pin PLCC
40-Pin PDIP
44-Pin PQFP
40-Pin PDIP
V-
B
1
C
1
D
1
V+
F
1
G
1
E
1
D
1
C
1
B
1
A
1
F
1
G
1
E
1
C
REF
+
C
REF
-
© 2005 Microchip Technology Inc. DS21461C-page 3
TC7136/TC7136A
Typical Application
V
REF
+
TC7136
TC7136A
33
34
240kΩ
10kΩ
31
29
39 38 40
V
REF
-
0.47
μF
0.1μF
V-
OSC1OSC3OSC2
To Analog Common (Pin 32)
1 Conversion/Sec
C
OSC
560kΩ
180kΩ
0.15μF
0.01μF
Analog
Input
+
–
C
REF
-
C
REF
+
V
IN
+
V
IN
-
ANALOG
COMMON
V
INT
V
BUFF
C
AZ
20
21
1
Segment
Drive
9-19
22-25
POL
BP
V+
Minus Sign
Backplane
28
50pF
LCD
1MΩ
27
30
32
35
36
9V
+
R
OSC
26
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P22

TC7136CLW713

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IC ADC 3 1/2DGT LOW PWR 44-PLCC
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