TC7106/7/6A/7A DataSheet

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  3-1/2 Digit Analog-to-Digital Converters


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 15VP–P noise performance guarantees a "rock solid" reading. The auto-zero cycle guarantees a zero display reading with a zero-volts input.

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

     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
- Guaranteed 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 9 V Battery Operation (TC7106A)
- High Impedance CMOS Differential Inputs.... 10 12 Ω
- Differential Reference Inputs Simplify  Ratiometric Measurements
- Low Power Operation: 10mW

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