TC7116

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: 1012Ω
• Low Power Operation: 10mW




Application

• Thermometry
• Bridge Readouts: Strain Gauges, Load Cells, Null Detectors
• Digital Meters: Voltage/Current/Ohms/Power, pH
• Digital Scales, Process Monitors
• Portable Instrumentation




Pinout






Specifications

Parameter NameValueSupply Voltage (V)9Power (mW)10Hold FunctionYesFor DMM, DPM, data loggersNoResolution (Digits)3.5Resolution (Counts)2000Display TypeLCD Temp. Range (°C)-25 to 85

Parameter Name	Value
Supply Voltage (V)	9
Power (mW)	10
Hold Function	Yes
For DMM, DPM, data loggers	No
Resolution (Digits)	3.5
Resolution (Counts)	2000
Display Type	LCD
Temp. Range (°C)	-25 to 85

Supply Voltage:
TC7116/TC7116A (V+ to V-) ...........................15V
TC7117/TC7117A (V+ to GND) ................................+6V
V- to GND.................................................................-9V
Analog Input Voltage (Either Input) (Note 1) ... V+ to VReference
Input Voltage (Either Input) ...................... V+ to VClock
Input:
TC7116/TC7116A.......................................... TEST to V+
TC7117/TC7117A............................................GND to V+
Package Power Dissipation; TA  70°C (Note 2)
40-Pin CDIP ..........................................................2.29W
40-Pin PDIP ..........................................................1.23W
44-Pin PLCC...........................................................1.23W
44-Pin PQFP...........................................................1.00W
Operating Temperature:
C (Commercial) Device ........................... 0°C to +70°C
I (Commercial) Device............................. 0°C to +70°C
Storage Temperature..........................-65°C to +150°C

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 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 reference 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.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 10 12 ? input impedance.The 15 VP-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.

The TC7116A/TC7117A are 3-1/2 digit CMOS analogto- 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 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 referencelow input (VREF-) is not available, as it is with the TC7106/7107. VREF- is tied internally to analog common in the TC7116A/7117A devices.