TC7107RCPL Datasheet, PDF (1/34 Pages) Microchip Technology – 3-1/2 Digit Analog-to-Digital Converters

TC7106/A/TC7107/A
3-1/2 Digit Analog-to-Digital Converters
Features:
• Internal Reference with Low Temperature Drift:
- TC7106/TC7107: 80 ppm/°C (Typical)
- TC7106A/TC7107A: 20 ppm/°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: 10¹²Î©
• Differential Reference Inputs Simplify Ratiometric
Measurements
• Low-Power Operation: 10 mW
Applications:
• Thermometry
• Bridge Readouts: Strain Gauges, Load Cells, Null
Detectors
• Digital Meters: Voltage/Current/Ohms/Power, pH
• Digital Scales, Process Monitors
• Portable Instrumentation
General Description:
The TC7106A and TC7107A 3-1/2 digit direct display
drive Analog-to-Digital Converters allow existing
TC7106/TC7107 based systems to be upgraded. Each
device has a precision reference with a 20 ppm/°C
maximum temperature coefficient. This represents a 4
to 7 times improvement over similar 3-1/2 digit
converters. Existing TC7106 and TC7107 based
systems may be upgraded without changing external
passive component values. The TC7107A drives
common anode light emitting diode (LED) displays
directly with 8 mA 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 por-
table 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 1 pA leakage current and a 10¹²Î© input
impedance. The differential reference input allows
ratiometric measurements for ohms or bridge
transducer measurements. The 15 µV_P–P noise
performance ensures a “rock solid” reading. The auto-
zero cycle ensures a zero display reading with a zero
volts input.
© 2008 Microchip Technology Inc.
DS21455D-page 1