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TC7117 fiches techniques PDF

TelCom - 3-1/2 DIGIT ANALOG-TO-DIGITAL CONVERTERS WITH HOLD

Numéro de référence TC7117
Description 3-1/2 DIGIT ANALOG-TO-DIGITAL CONVERTERS WITH HOLD
Fabricant TelCom 
Logo TelCom 





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TC7117 fiche technique
1TC7116
TC7116A
TC7117
TC7117A
3-1/2 DIGIT ANALOG-TO-DIGITAL CONVERTERS WITH HOLD
FEATURES
s Low Temperature Drift Internal Reference
TC7116/TC7117 ............................. 80 ppm/°C Typ
TC7116A/TC7117A ........................ 20 ppm/°C Typ
s Display Hold Function
s Directly Drives LCD or LED Display
s Guaranteed Zero Reading With Zero Input
s Low Noise for Stable
Display ......... 2V or 200 mV Full-Scale Range (FSR)
s Auto-Zero Cycle Eliminates Need for Zero
Adjustment Potentiometer
s True Polarity Indication for Precision Null
Applications
s Convenient 9V Battery Operation
(TC7116/TC7116A)
s High Impedance CMOS Differential Inputs .... 1012
s 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):
GENERAL DESCRIPTION
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 1012input 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.
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.
2
3
4
5
Package
Code
Package
CKW
CLW
CPL
IJL
44-Pin PQFP
44-Pin PLCC
40-Pin Plastic DIP
40-Pin CerDIP
AVAILABLE PACKAGES
40-Pin Plastic
DIP
40-Pin CerDIP
Temperature
Range
0°C to +70°C
0°C to +70°C
0°C to +70°C
– 25°C to +85°C
44-Pin Plastic Quad Flat
Package Formed Leads
44-Pin Plastic Chip
Carrier PLCC
TELCOM SEMICONDUCTOR, INC.
1 M
+
ANALOG
INPUT
0.01 µF
0.1 µF
DISPLAY
HOLD LCD DISPLAY (TC7116/7116A)
34 33 1
OR COMMON ANODE LED
CR+ EF
31 VI+N
CR– EF HLDR
DISPLAY (TC7117/7117A)
2–19 SEGMENT
22–25 DRIVE
30 VI–N
32 ANALOG
COMMON
POL 20
MINUS SIGN
BP/GND 21
V+ 35
BACKPLANE
DRIVE
47 k
0.22 µF
28
VBUFF
TC7116/A
TC7117/A
24 k
0.47 µF
29 CAZ
36
VR+EF
VREF
100 mV
1 k
+
9V
27 VINT
V– 26
OSC2 OSC3 OSC1
39 38 COSC 40
TO ANALOG
COMMON (PIN 32)
ROSC 100 pF
3 CONVERSIONS/SEC
100 k
Figure 1. Typical TC7116/A/7/A Operating Circuit
TC7116/A/7117/A-7 10/18/96
3-203
6
7
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