EVALUATION KIT AVAILABLE ICL7116/ICL7117 3 Digit ADCs with Display Hold General Description Features The Maxim ICL7116 and ICL7117 are 3 digit monolithic Improved 2nd Source analog-to-digital converters. They differ from the Maxim Hold Pin Allows Indefinite Display Hold ICL7106 and ICL7107 in that the ICL7116 and ICL7117 Guaranteed First Reading Recovery from Overrange have a Hold pin, which makes it possible to hold or freeze a reading. These integrating ADCs have very On-Board Display Drive CapabilityNo External high input impedances and directly drive LCD (ICL7116) Circuitry Required: LCD (ICL7116), LED (ICL7117) and LED (ICL7117) displays. High-Impedance CMOS Differential Inputs Versatility and accuracy are inherent features of these Low Noise (< 15V ) Without Hysteresis or P-P converters. The dual-slope conversion technique auto- Overrange Hangover matically rejects interference signals common in industrial environments. The true differential input is particularly Clock and Reference On-Chip useful when making ratiometric measurements (ohms or Zero Input Gives Zero Reading bridge transducers). Maxim has added a zero-integrator True Polarity Indication for Precision Null Applications phase to the ICL7116 and ICL7117, eliminating overrange hangover and hysteresis effects. Finally, these devices Ordering Information appears at end of data sheet. offer high accuracy by lowering rollover error to less than one count and zero reading drift to less than 1V/C. Applications These devices can be used in a wide range of digital Pin Configurations panel meter applications. Most applications, however, involve the measurement and display of analog data: TOP VIEW Pressure Conductance 1 HOLD OSC1 40 Voltage Current 2 D1 OSC2 39 Resistance Speed 3 C1 OSC3 38 Temperature Material Thickness 4 B1 TEST 37 ICL7116 5 A1 REF HI 36 ICL7117 Typical Operating Circuit 6 F1 V+ 35 7 G1 C+REF 34 LCD DISPLAY 8 E1 C-REF 33 + ANALOG 9 D2 COMMON 32 INPUT - 10 C2 ON HI 31 11 B2 ON LO 30 CLOSED = HOLD ICL7116 12 A2 A/Z 29 OPEN = RUN 13 F2 BUFF 28 14 E2 INT 27 15 D3 V- 26 9V 16 B3 G2 25 VREF 17 F3 C3 24 18 E3 A3 23 19 AB4 G3 22 TO ANALOG 20 POL BP/GND 21 COMMON PIN PIN 32 PDIP Pin Configurations continued at end of data sheet Detailed Circuit Diagram - see Figure 1 19-0949 Rev 2 1/17ICL7116/ICL7117 3 Digit ADCs with Display Hold Absolute Maximum Ratings Supply Voltage Power Dissipation (Note 2) ICL7116, V+ to V- ..................................................................15V Ceramic Package ..........................................................1000mW ICL7117, V+ to GND .............................................................+6V CERDIP Package ............................................................800mW ICL7117, V- to GND............................................................... -9V Plastic Package ...............................................................800mW - Analog Input Voltage (either input) (Note 1)...................V+ to V Operating Temperature Range ...............................0C to +70C - Reference lnput Voltage (either input)............................V+ to V Storage Temperature Range .............................-65C to +160C Clock Input Lead Temperature (soldering, 60s) .................................+300C + ICL7116 ...................................................................Test to V + ICL7117 ..................................................................GND to V Note 1: Input voltage may exceed supply voltages, provided the input current is limited to 100A. Note 2: Dissipation rating assumes device is mounted with all leads soldered to the PCB. Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. (Note 3) Electrical Characteristics PARAMETER CONDITIONS MIN TYP MAX UNITS V = 0V Digital IN Zero Input Reading -000.0 000.0 +000.0 Full Scale = 200.00mV Reading 999/ Digital Ratiometric Reading V = V = 100mV 999 1000 IN REF 1000 Reading Rollover Error (Difference in Reading for Equal Positive and Negative Reading Near Full -V = +V = 200mV -1 0.2 +1 Counts IN IN Scale) Linearity (Max. Deviation from Best Straight Full Scale = 200mV -1 0.2 +1 Counts Line Fit) or Full Scale = 2.00mV V = 1V, V = 0V CM IN Common-Mode Rejection Ratio (Note 4) 50 V/V Full Scale = 200.00mV Noise (Pk-Pk Value Not Exceeded 95% of the V = 0V IN 15 V Time) Full Scale = 200.00mV Leakage Current at Input V = 0V 1 10 pA IN Zero Reading Drift V = 0V, 0C < T < 70C 0.2 1 V/C IN A V = 199.0mV IN Scale Factor Temperature Coefficient 0C < T < 70C 1 5 ppm/C A (Ext. Ref. 0ppm/C) V+ Supply Current (Does Not Include LED V = 0V 0.8 1.8 mA IN Current for ICL7117) V- Supply Current for ICL7117 Only 0.6 1.8 mA Analog Common Voltage (With Respect to 25 Between Common and Positive Supply 2.4 2.8 3.2 V Positive Supply) Temperature Coefficient of Analog Common 25 Between Common and Positive Supply 80 ppm/C (With Respect to Pos. Supply) Input Resistance, Pin 1 (Note 6) 30 70 k V , Pin 1 (ICL7116 Only) TEST 1.5 V IL Maxim Integrated 2 www.maximintegrated.com