TC7116 Datasheet, PDF (1/14 Pages) TelCom Semiconductor, Inc – 3-1/2 DIGIT ANALOG-TO-DIGITAL CONVERTERS WITH HOLD

1 ^TC7116
TC7116A
TC7117
TC7117A
3-1/2 DIGIT ANALOG-TO-DIGITAL CONVERTERS WITH HOLD
2
FEATURES
GENERAL DESCRIPTION
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 .... 10¹²â„¦
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):
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
3 ^{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
4 ^{low input (VR–EF) is not available as it is with the TC7106/}
7107. V_R–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 10¹²â„¦ input impedance. The 15
5 ^{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.
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 MΩ
+
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 kΩ
0.22 µF
28
VBUFF
TC7116/A
TC7117/A
24 kΩ
+
0.47 µF
29 ^CAZ
36
VR+EF
VREF
1 kΩ
9V
100 mV
27 _VINT
V– ²⁶
OSC2 OSC3 OSC1
39 38 COSC 40
TO ANALOG
COMMON (PIN 32)
ROSC 100 pF
3 CONVERSIONS/SEC
100 kΩ
Figure 1. Typical TC7116/A/7/A Operating Circuit
TC7116/A/7117/A-7 10/18/96
3-203
6
7
8