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TC7126

更新时间： 2024-09-15 22:42:27
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描述
3-1/2 DIGIT ANALOG-TO-DIGITAL CONVERTERS

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TC7126 数据手册

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3
TC7126  
TC7126A  
3-1/2 DIGIT ANALOG-TO-DIGITAL CONVERTERS  
GENERAL DESCRIPTION  
FEATURES  
The TC7126A is a 3-1/2 digit CMOS analog-to-digital  
converter (ADC) containing all the active components nec-  
essary to construct a 0.05% resolution measurement sys-  
tem. 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. Roll-over error (the difference in readings for equal  
magnitude but opposite polarity input signals) is below ±1  
count. High-impedance differential inputs offer 1 pA leak-  
age current and a 1012Ω input impedance. The 15 µVP-P  
noise performance guarantees a "rock solid" reading, and  
the auto-zero cycle guarantees a zero display reading with  
a 0V input.  
■ Low Temperature Drift Internal Reference  
TC7126 ....................................... 80 ppm/°C Typ  
TC7126A ..................................... 35 ppm/°C Typ  
■ Guaranteed Zero Reading With Zero Input  
■ Low Noise.................................................... 15 µVP-P  
■ High Resolution ..............................................0.05%  
■ Low Input Leakage Current ...................... 1 pA Typ  
10 pA Max  
■ Precision Null Detectors With True Polarity at  
Zero  
■ High-Impedance Differential Input  
■ Convenient 9V Battery Operation With  
Low Power Dissipation ........................ 500 µW Typ  
900 µW Max  
TYPICAL APPLICATIONS  
■ Thermometry  
■ Bridge Readouts: Strain Gauges, Load Cells, Null  
Detectors  
■ Digital Meters and Panel Meters  
— Voltage/Current/Ohms/Power, pH  
■ Digital Scales, Process Monitors  
The TC7126A features a precision, low-drift internal  
voltagereferenceandisfunctionallyidenticaltotheTC7126.  
A low-drift external reference is not normally required with  
the TC7126A.  
TYPICAL OPERATING CIRCUIT  
ORDERING INFORMATION  
PART CODE  
TC7126X X XXX  
0.1 µF  
A or blank*  
33  
–
34  
C
R (reversed pins) or blank (CPL pkg only)  
* "A" parts have an improved reference TC  
Package Code (see below):  
LCD  
+
C
REF  
REF  
1 MΩ  
31  
SEGMENT  
DRIVE  
+
2–19  
+
V
IN  
22–25  
ANALOG  
INPUT  
–
0.01 µF  
20  
–
30  
32  
POL  
BP  
V
IN  
MINUS SIGN  
21  
1
BACKPLANE  
ANALOG  
COMMON  
Package  
Code  
Temperature  
+
V
Package  
Range  
28  
V
240 kΩ  
BUFF  
+
TC7126  
TC7126A  
CKW  
CLW  
CPL  
IPL  
44-Pin PQFP  
0°C to +70°C  
0°C to +70°C  
9V  
0.33  
µF  
180 kΩ  
36  
44-Pin PLCC  
+
V
29  
REF  
10 kΩ  
C
V
AZ  
40-Pin PDIP  
0°C to +70°C  
–
35  
26  
0.15 µF  
V
REF  
27  
40-Pin PDIP (non-A only)  
– 25°C to +85°C  
–
V
INT  
1 CONVERSION/SEC  
OSC OSC OSC  
2
3
1
AVAILABLE PACKAGES  
C
39  
38  
40  
OSC  
TO ANALOG COMMON  
(PIN 32)  
50 pF  
R
OSC  
NOTE: Pin numbers refer to 40-pin DIP.  
560 kΩ  
40-Pin Plastic DIP  
44-Pin Plastic Quad Flat  
Package Formed Leads  
44-Pin Plastic Chip  
Carrier PLCC  
TC7126/A-8 11/6/96  
TELCOM SEMICONDUCTOR, INC.  
3-217  
1234567...13

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