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TC7126CPL

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P28
2002-2012 Microchip Technology Inc. DS21458D-page 1
TC7126/A
Features:
• Internal Reference with Low Temperature Drift:
- TC7126: 80ppm/°C, Typical
- TC7126A: 35ppm/°C, Typical
• Zero Reading with Zero Input
• Low Noise: 15V
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: 500W Typ., 900W Max.
Applications:
• Thermometry
• Bridge Readouts: Strain Gauges, Load Cells,
Null Detectors
• Digital Meters and Panel Meters:
- Voltage/Current/Ohms/Power, pH
• Digital Scales, Process Monitors
Device Selection Table
General Description:
The TC7126A is a 3-1/2 digit CMOS Analog-to-Digital
Converter (ADC) containing all the active components
necessary to construct a 0.05% resolution measure-
ment system. Seven-segment decoders, digit and
polarity drivers, voltage reference, and clock circuit are
integrated on-chip. The TC7126A directly drives a
Liquid Crystal Display (LCD), and includes a backplane
driver.
A low-cost, high resolution indicating meter requires
only a display, four resistors, and four capacitors. The
TC7126A’s extremely low-power drain and 9V battery
operation make it ideal for portable applications.
The TC7126A reduces linearity error to less than 1
count. Rollover error (the difference in readings for
equal magnitude, but opposite polarity input signals) is
below ±1 count. High-impedance differential inputs
offer 1pA leakage current and a 10
12
input imped-
ance. The 15V
P-P
noise performance ensures a “rock
solid” reading, and the auto-zero cycle ensures a zero
display reading with a 0V input.
The TC7126A features a precision, low drift internal
voltage reference and is functionally identical to the
TC7126. A low drift external reference is not normally
required with the TC7126A.
Package
Code
Package
Temperature
Range
CPL 40-Pin PDIP 0C to +70C
IPL 40-Pin PDIP (TC7126 Only) -25C to +85C
CKW 44-Pin PQFP 0C to +70C
CLW 44-Pin PLCC 0C to +70C
3-1/2 Digit Analog-to-Digital Converters
TC7126/A
DS21458D-page 2 2002-2012 Microchip Technology Inc.
Package Type
TC7126CPL
TC7126ACPL
TC7126IPL
TC7126AIPL
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
Reverse 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)
TC7126RCPL
TC7126ARCPL
TC7126RIPL
TC7126ARIPL
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
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
TC7126CKW
TC7126ACKW
12 13 14 15 17 18
G
2
44 43 42 41 39 3840
ANALOG
COMMON
16
37
C
AZ
36
V
BUFF
35
V
INT
34
V-
19 20 21 22
D
3
26
8
25
9
24
10
23
11
5
6
C
3
OSC3
TEST
NC
NC
V+
D
2
C
2
B
2
A
2
F
2
E
2
NC
OSC2
OSC1
C
REF
+
C
REF
-
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
V
REF
-
18 19 20 21 23 24
AB
4
POL
NC
BP
NC
B
2
6543 1442
A
1
OSC1
22
43
OSC2
42
OSC3
41
TEST
40
25 26 27 28
F
3
E
3
G
3
A
3
C
3
G
2
3214
C
AZ
3115
V
BUFF
3016
V
INT
E
2
2917
D
3
NC
11
12
NC
C
2
D
2
F
2
A
2
B
3
TC7126CLW
TC7126ACLW
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
-
V
IN
+
V
IN
-
V
REF
+
V
REF
+
V
REF
-
V
IN
+
V
IN
-
44-Pin PQFP
44-Pin PDIP (Reverse)
44-Pin PLCC
40-Pin PDIP (Normal)
2002-2012 Microchip Technology Inc. DS21458D-page 3
TC7126/A
Typical Application
V
REF
+
TC7126
TC7126A
33
34
240kΩ
10kΩ
31
29
39 38 40
V
REF
-
0.33
μF
0.1μF
V-
OSC1OSC3OSC2
To Analog Common (Pin 32)
1 Conversion/Sec
C
OSC
560kΩ
180kΩ
0.15μF
0.01μF
A
nalog
Input
+
–
C
REF
-C
REF
+
V
IN
+
V
IN
-
ANALOG
COMMON
V
INT
V
BUFF
C
AZ
20
21
1
Segment
Drive
2–19
22–25
POL
BP
V+
Minus Sign
Backplane
28
50pF
LCD
1MΩ
27
30
32
35
36
9V
+
R
OSC
26
Note: Pin numbers refer to 40-pin DIP.
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P28

TC7126CPL

Mfr. #:
Buy TC7126CPL
Manufacturer:
Microchip Technology
Description:
LCD Drivers Low Power
Lifecycle:
New from this manufacturer.
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