TC7116/A/TC7117/A 3-1/2 Digit Analog-to-Digital Converters with Hold Features: General Description: Low Temperature Drift Internal Reference: The TC7116A/TC7117A are 3-1/2 digit CMOS Analog- to-Digital Converters (ADCs) containing all the active - TC7116/TC7117 80 ppm/C, Typ. components necessary to construct a 0.05% resolution - TC7116A/TC7117A 20 ppm/C, Typ. measurement system. Seven-segment decoders, Display Hold Function polarity and digit drivers, voltage reference, and clock Directly Drives LCD or LED Display circuit are integrated on-chip. The TC7116A drives Zero Reading with Zero Input Liquid Crystal Displays (LCDs) and includes a back- Low Noise for Stable Display: plane driver. The TC7117A drives common anode Light Emitting Diode (LED) displays directly with an 8mA - 2V or 200mV Full Scale Range (FSR) drive current per segment. Auto-Zero Cycle Eliminates Need for Zero These devices incorporate a display hold (HLDR) Adjustment Potentiometer function. The displayed reading remains indefinitely, as True Polarity Indication for Precision Null long as HLDR is held high. Conversions continue, but Applications output data display latches are not updated. The refer- Convenient 9V Battery Operation: ence low input (V -) is not available, as it is with the REF (TC7116/TC7116A) TC7106/7107. V - is tied internally to analog REF 12 High-Impedance CMOS Differential Inputs: 10 common in the TC7116A/7117A devices. Low-Power Operation: 10mW The TC7116A/7117A reduces linearity error to less than 1 count. Rollover error (the difference in readings Applications: for equal magnitude but opposite polarity input signals) is below 1 count. High-impedance differential inputs Thermometry 12 offer 1pA leakage current and a 10 input imped- Bridge Readouts: Strain Gauges, Load Cells, ance. The 15 V noise performance enables a rock P-P Null Detectors solid reading. The auto-zero cycle ensures a zero Digital Meters: Voltage/Current/Ohms/Power, pH display reading with a 0V input. Digital Scales, Process Monitors The TC7116A and TC7117A feature a precision, low Portable Instrumentation drift internal reference, and are functionally identical to the TC7116/TC7117. A low drift external reference is Device Selection Table not normally required with the TC7116A/TC7117A. Package Code Package Temperature Range CPL 40-Pin PDIP 0 C to +70C IJL 40-Pin CERDIP -25 C to +85 C CKW 44-Pin PQFP 0 C to +70C CLW 44-Pin PLCC 0 C to +70C 2002-2012 Microchip Technology Inc. DS21457D-page 1TC7116/A/TC7117/A Package Type 40-Pin PDIP 40-Pin CERDIP HLDR 40 OSC1 1 HLDR 1 40 OSC1 D 2 39 OSC2 1 D 39 2 OSC2 1 C 38 3 OSC3 C 1 3 38 1 OSC3 B 4 37 TEST B 1 4 37 TEST 1 A 5 36 1 s V + A 1 1 s 5 36 V + REF 1 REF F 6 35 V+ F 1 6 35 V+ 1 1 G 7 34 C + 1 G 34 C + REF 7 REF E 8 33 C - E C - 1 REF 8 33 1 REF TC7116CPL D 9 32 COMMON TC7116IJL TC7116ACPL 9 32 2 D COMMON 2 TC7116AIJL TC7117CPL 31 C 10 V + C 10 31 V + 2 IN 2 IN TC7117IJL TC7117ACPL B 30 V - 11 B 2 IN 11 30 V - 2 IN 10 s TC7117AIJL 10 s A 12 29 C A 12 29 C 2 AZ 2 AZ F 13 28 V F 2 13 28 BUFF 2 V BUFF E 14 27 V E 14 27 2 INT V 2 INT 15 26 D V- D 15 26 V- 3 3 B 16 25 G B 16 25 3 G 2 3 2 100 s 100 s F 24 17 C F 17 24 C 3 3 3 3 100 s 100 s E 18 23 A 23 3 E 18 A 3 3 3 1000 s AB 19 22 G AB 19 22 4 3 1000 s G 4 3 20 21 POL BP/GND POL 20 21 BP/GND (Minus Sign) (TC7116/7117) (Minus Sign) (TC7116/7117) (TC7116A/TC7117A) (TC7116A/TC7117A) 44-Pin PLCC 44-Pin PQFP 6 543 2 1 44 43 42 41 40 44 43 42 41 40 39 38 37 36 35 34 1 33 NC NC F 7 39 V+ 1 2 32 G NC G C + 3 8 38 1 REF 31 C TEST 3 C - 3 E 9 37 1 REF 30 A 4 OSC3 3 D 10 36 COMMON 2 29 G NC 5 3 35 C 11 V + TC7116CKW 2 IN TC7116CLW BP/ OSC2 28 6 TC7116ACKW 34 NC 12 NC GND TC7116ACLW TC7117CKW 27 OSC1 7 POL B2 TC7117CLW 13 33 V - IN TC7117ACKW TC7117ACLW 26 AB HLDR 8 A 4 14 32 C 2 AZ D 25 E 9 1 3 F 15 31 V 2 BUFF 24 F C 10 3 E 16 30 V 1 2 INT 23 B 11 B D 3 17 29 V- 1 3 25 26 27 28 12 13 14 15 16 17 18 19 20 21 22 18 19 20 21 22 23 24 Note 1: NC = No internal connection. 2: Pins 9, 25, 40 and 56 are connected to the die substrate. The potential at these pins is approximately V+. No external connections should be made. DS21457D-page 2 2002-2012 Microchip Technology Inc. A B 1 3 F B 3 1 C E 1 3 AB D 4 1 HLDR POL NC NC BP/ OSC1 GND G OSC2 3 OSC3 A 3 TEST C 3 G V + 2 REF A V + 1 REF F V+ 1 G C + 1 REF E C - 1 REF COMMON D 2 V + C 2 IN B V - 2 IN A C 2 AZ F V 2 BUFF V E INT 2 V- D 3