TC7116_13 Datasheet, PDF (1/26 Pages) Microchip Technology – 3-1/2 Digit Analog-to-Digital Converters with Hold

TC7116/A/TC7117/A
3-1/2 Digit Analog-to-Digital Converters with Hold
Features:
• 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
• Zero Reading with Zero Input
• Low Noise for Stable Display:
- 2V or 200mV 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: 10¹²ï—
• Low-Power Operation: 10mW
Applications:
• Thermometry
• Bridge Readouts: Strain Gauges, Load Cells,
Null Detectors
• Digital Meters: Voltage/Current/Ohms/Power, pH
• Digital Scales, Process Monitors
• Portable Instrumentation
Device Selection Table
Package Code
Package
Temperature Range
CPL
IJL
CKW
CLW
40-Pin PDIP
40-Pin CERDIP
44-Pin PQFP
44-Pin PLCC
0C to +70C
-25C to +85C
0C to +70C
0C to +70C
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 back-
plane driver. The TC7117A drives common anode Light
Emitting Diode (LED) displays directly with an 8mA
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 refer-
ence low input (V_REF-) is not available, as it is with the
TC7106/7107. V_REF- is tied internally to analog
common in the TC7116A/7117A devices.
The TC7116A/7117A 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 10¹²ï— input imped-
ance. The 15V_P-P noise performance enables a “rock
solid” reading. The auto-zero cycle ensures 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.
 2002-2012 Microchip Technology Inc.
DS21457D-page 1