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TC7117

更新时间： 2024-11-05 22:42:27
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3-1/2 DIGIT ANALOG-TO-DIGITAL CONVERTERS WITH HOLD

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TC7116  
TC7116A  
TC7117  
3
TC7117A  
3-1/2 DIGIT ANALOG-TO-DIGITAL CONVERTERS WITH HOLD  
GENERAL DESCRIPTION  
FEATURES  
The TC7116A/TC7117A are 3-1/2 digit CMOS analog-  
to-digital converters (ADCs) containing all the active  
components necessary to construct a 0.05% resolution  
measurement system. Seven-segment decoders, polarity  
and digit drivers, voltage reference, and clock circuit are  
integrated on-chip. The TC7116A drives liquid crystal  
displays (LCDs) and includes a backplane driver. The  
TC7117A drives common anode light emitting diode (LED)  
displays directly with an 8-mA drive current per segment.  
These devices incorporate a display hold (HLDR)  
function. The displayed reading remains indefinitely, as  
long as HLDR is held high. Conversions continue, but  
output data display latches are not updated. The reference  
low input (VR–EF) is not available as it is with the TC7106/  
7107. VR–EF is tied internally to analog common in the  
TC7116A/7117A devices.  
The TC7116A/7117A 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 leakage current and a 1012Ω input impedance. The 15  
µVP-P noise performance guarantees a “rock solid” reading.  
The auto-zero cycle guarantees a zero display reading with  
a 0V input.  
■ Low Temperature Drift Internal Reference  
TC7116/TC7117 ............................. 80 ppm/°C Typ  
TC7116A/TC7117A........................ 20 ppm/°C Typ  
■ Display Hold Function  
■ Directly Drives LCD or LED Display  
■ Guaranteed Zero Reading With Zero Input  
■ Low Noise for Stable  
Display ......... 2V or 200 mV Full-Scale Range (FSR)  
■ Auto-Zero Cycle Eliminates Need for Zero  
Adjustment Potentiometer  
■ True Polarity Indication for Precision Null  
Applications  
■ Convenient 9V Battery Operation  
(TC7116/TC7116A)  
■ High Impedance CMOS Differential Inputs.... 1012Ω  
■ Low Power Operation .................................... 10 mW  
ORDERING INFORMATION  
PART CODE  
TC711X X X XXX  
6 = LCD  
7 = LED  
}
A or blank*  
R (reversed pins) or blank (CPL pkg. only)  
* "A" parts have an improved reference TC  
Package Code (see below):  
The TC7116A and TC7117A feature a precision, low-  
drift internal reference, and are functionally identical to the  
TC7116/TC7117. A low-drift external reference is not  
normally required with the TC7116A/TC7117A.  
0.1 µF  
Package  
Code  
Temperature  
DISPLAY  
HOLD  
LCD DISPLAY (TC7116/7116A)  
OR COMMON ANODE LED  
DISPLAY (TC7117/7117A)  
Package  
Range  
33  
1
34  
+
–
HLDR  
C
C
REF  
REF  
CKW  
CLW  
CPL  
IJL  
44-Pin PQFP  
0°C to +70°C  
0°C to +70°C  
1 MΩ  
31  
SEGMENT  
DRIVE  
+
2–19  
22–25  
+
V
IN  
44-Pin PLCC  
ANALOG  
INPUT  
–
0.01 µF  
20  
POL  
–
40-Pin Plastic DIP  
40-Pin CerDIP  
0°C to +70°C  
30  
32  
V
IN  
BACKPLANE  
DRIVE  
MINUS SIGN  
21  
35  
– 25°C to +85°C  
BP/GND  
ANALOG  
COMMON  
+
V
AVAILABLE PACKAGES  
24 kΩ  
TC7116/A  
TC7117/A  
40-Pin Plastic  
DIP  
40-Pin CerDIP  
28  
V
BUFF  
+
47 kΩ  
9V  
36  
26  
V
REF  
0.47 µF  
+
V
REF  
1 kΩ  
C
V
AZ  
100 mV  
29  
27  
0.22 µF  
–
V
INT  
44-Pin Plastic Quad Flat  
Package Formed Leads  
OSC OSC OSC  
2
3
1
TO ANALOG  
COMMON (PIN 32)  
C
39  
38  
40  
OSC  
3 CONVERSIONS/SEC  
R
100 pF  
OSC  
100 kΩ  
44-Pin Plastic Chip  
Carrier PLCC  
Figure 1. Typical TC7116/A/7/A Operating Circuit  
TC7116/A/7117/A-7 10/18/96  
TELCOM SEMICONDUCTOR, INC.  
3-203  
1234567...14

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