TC7106A

Features:

• Internal Reference with Low Temperature Drift
- TC7106/7: 80ppm/°C Typical
- TC7106A/7A: 20ppm/°C Typical
• Drives LCD (TC7106) or LED (TC7107) Display Directly
• Zero Reading with Zero Input
• Low Noise for Stable Display
• Auto-Zero Cycle Eliminates Need for Zero Adjustment
• True Polarity Indication for Precision Null Applications
• Convenient 9V Battery Operation (TC7106A)
• High Impedance CMOS Differential Inputs: 1012Ω
• Differential Reference Inputs Simplify Ratiometric Measurements
• 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 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

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

         TC7106A
Supply Voltage (V+ to V-) .................................................15V
Analog Input Voltage (either Input) (Note 1) ................ V+ to VReference
Input Voltage (either Input) .................................... V+ to VClock
Input ............................................................. Test to V+
Package Power Dissipation (TA  70°C) (Note 2):
40-Pin CERDIP ..........................................................2.29W
40-Pin PDIP .............................................................1.23W
44-Pin PLCC .............................................................1.23W
44-Pin PQFP .............................................................1.00W
Operating Temperature Range:.
C (Commercial) Devices ......................................... 0°C to +70°C
I (Industrial) Devices ........................................-25°C to +85°C
Storage Temperature Range ................................... -65°C to +150°C
            TC7107A
Supply Voltage (V+) .......................................................+6V
Supply Voltage (V-)........................................................-9V
Analog Input Voltage (either Input) (Note 1)............. ... V+ to VReference
Input Voltage (either Input) ..................................... V+ to VClock
Input ...............................................................GND to V+
Package Power Dissipation (TA  70°C) (Note 2):
40-Pin CERDip..............................................................2.29W
40-Pin PDIP ...............................................................1.23W
44-Pin PLCC ...............................................................1.23W
44-Pin PQFP ...............................................................1.00W
Operating Temperature Range:
C (Commercial) Devices ........................................... 0°C to +70°C
I (Industrial) Devices ..........................................-25°C to +85°C
Storage Temperature Range .................... .................-65°C to +150°C

Description

The TC7106A and TC7107A 3-1/2 digit direct-display drive analog-to-digital converters allow existing 7106/7107 based systems to be upgraded. Each device has a precision reference with a 20ppm/°C max temperature coefficient. This represents a 4 to 7 times improvement over similar 3-1/2 digit converters. Existing 7106 and 7107 based systems may be upgraded without changing external passive component values. The TC7107A drives common anode light emitting diode (LED) displays directly with 8mA per segment. A low-cost, high-resolution indicating meter requires only a display, four resistors, and four capacitors. The TC7106A low power drain and 9V battery operation make it suitable for portable applications. The TC7106A/TC7107A 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 10 12 Ω input impedance. The differential reference input allows ratiometric measurements for ohms or bridge transducer measurements. The 15VPP noise performance guarantees a "rock solid" reading. The auto-zero cycle guarantees a zero display reading with a zero-volts input.

The TC7106A and TC7107A 3-1/2 digit direct display drive analog-to-digital converters allow existing 7106/7107 based systems to be upgraded. Each device has a precision reference with a 20ppm/°C max temperature coefficient. This represents a 4 to 7 times improvement over similar 3-1/2 digit converters. Existing 7106 and 7107 based systems may be upgraded withoutchanging external passive component values. The TC7107A drives common anode light emitting diode (LED) displays directly with 8mA per segment. A low cost, high resolution indicating meter requires only a display, four resistors, and four capacitors.The TC7106A low power drain and 9V battery operation make it suitable for portable applications.