TC7106/A/TC7107/A 3-1/2 Digit Analog-to-Digital Converters Features: General Description: Internal Reference with Low Temperature Drift: The TC7106A and TC7107A 3-1/2 digit direct display drive Analog-to-Digital Converters allow existing - TC7106/TC7107: 80 ppm/C (Typical) TC7106/TC7107 based systems to be upgraded. Each - TC7106A/TC7107A: 20 ppm/C (Typical) device has a precision reference with a 20 ppm/C Drives LCD (TC7106) or LED (TC7107) maximum temperature coefficient. This represents a 4 Display Directly to 7 times improvement over similar 3-1/2 digit Zero Reading with Zero Input converters. Existing TC7106 and TC7107 based Low Noise for Stable Display systems may be upgraded without changing external passive component values. The TC7107A drives Auto-Zero Cycle Eliminates Need for Zero Adjustment common anode light emitting diode (LED) displays directly with 8mA per segment. A low cost, high True Polarity Indication for Precision Null resolution indicating meter requires only a display, four Applications resistors, and four capacitors. The TC7106A low-power Convenient 9V Battery Operation (TC7106A) drain and 9V battery operation make it suitable for por- 12 High-Impedance CMOS Differential Inputs: 10 table applications. Differential Reference Inputs Simplify Ratiometric The TC7106A/TC7107A reduces linearity error to less Measurements than 1 count. Rollover error the difference in readings Low-Power Operation: 10 mW for equal magnitude, but opposite polarity input signals, is below 1 count. High-impedance differential inputs 12 Applications: offer 1pA leakage current and a 10 input impedance. The differential reference input allows Thermometry ratiometric measurements for ohms or bridge Bridge Readouts: Strain Gauges, Load Cells, Null transducer measurements. The 15V noise PP Detectors performance ensures a rock solid reading. The auto- Digital Meters: Voltage/Current/Ohms/Power, pH zero cycle ensures a zero display reading with a zero Digital Scales, Process Monitors volts input. Portable Instrumentation 2008 Microchip Technology Inc. DS21455D-page 1TC7106/A/TC7107/A Package Type 40-Pin PDIP 44-Pin PLCC V+ 1 40 OSC1 Normal Pin D 2 39 1 Configuration OSC2 6 5 4 3 2 1 44 43 42 41 40 C 3 38 OSC3 1 B 4 37 TEST 1 7 REF LO F 39 A 5 36 1 1s V + 1 REF F 6 35 G 8 38 C 1 V - REF 1 REF G 7 34 C - 1 REF E 9 37 C 1 REF E 8 33 C - 1 REF D 10 36 COMMON 2 TC7106ACPL 32 ANALOG D 9 2 TC7107AIPL COMMON C 11 35 IN HI 2 C 10 31 V + 2 IN TC7106ACLW 12 NC 34 B 11 30 V - 2 IN 10s TC7107ACLW A 12 29 C B 13 33 IN LO 2 AZ 2 F 13 28 V 2 BUFF A 14 32 A/Z 2 E 14 27 V 2 INT F 15 31 BUFF 2 D 15 26 V- 3 E 16 30 INT 2 B 16 25 G 3 2 100s D 17 29 V- 2 F 17 24 C 3 3 100s E 18 23 A 3 3 1000s AB 19 22 G 18 19 20 21 22 23 24 25 26 27 28 4 3 20 21 POL BP/GND (Minus Sign) (7106A/7107A) 44-Pin MQFP 44 43 42 41 40 39 38 37 36 35 34 1 NC NC 33 NC 2 32 G 2 TEST 3 31 C 3 OSC3 4 30 A 3 NC 5 29 G 3 TC7106ACKW OSC2 6 BP/GND 28 TC7107ACKW OSC1 7 27 POL V+ 8 26 AB 4 D 9 25 E 1 3 C 10 24 F 1 3 B 11 23 B 1 3 12 13 14 15 16 17 18 19 20 21 22 DS21455D-page 2 2008 Microchip Technology Inc. A REF HI 1 F REF LO 1 G C 1 REF E C 1 REF D COM 1 C IN HI 1 B IN LO 2 B A 3 1 A A/Z 2 F B 3 1 F BUFF 2 E C 3 1 E INT 2 AB D 4 1 D V- 3 POL V + NC NC BP/GND OSC1 G OSC2 3 A OSC3 3 C TEST 3 G REF HI 2