ICL7116 Description The Intersil ICL7116 are high performance, low power, 3 /1 2 digit, A/D converters. Incl uded are seven segment decoders, display drivers, a reference, and a cl ock. The ICL7116 is designed to interface with a liquid crystal display (LCD) and includes a multiplexed backplane drive.The ICL7116 have all of the featur es of the ICL7106 with the additi on of a HOLD Reading input. With this input, it is possible to make a measurement and retain the value on the display indefinitely. To make room for this feature the reference low input has been connected to Common internally rather than being fully differential. These circuits retain the accuracy, versatility, and true economy ofthe ICL7106. They feature 0 auto-zero to less than 10µV, zero drift of less than 1µV/ C, input bias current of 10pA maximum, and roll over error of less than one count. The versatility of true different ial input is of particular advantage when measuring load cells, strain gauges and other bridge-ty pe transducers. And finally, the true economy of single power supply operation (ICL7116) enables a high performance panel me ter to be built with the addition of only eleven passive components and a display. Features • HOLD Reading Input Allows Indefinite Display Hold • Guaranteed Zero Reading for 0V Input • True Polarity at Zero for Precise Null Detection • 1pA Typical Input Current • Direct Display Drive - LCD ICL7116 • Low Noise - Less Than 15µV P-P (Typ) • On Chip Clock and Reference • Low Power Dissipation - Typically Less Than 10mW • No Additional Active Circuits Required • Surface Mount Package Available Ope r a t ing Cond i t ion s Temperature Range . . . . . . . . . . . . . . . . . . . . . . . . . . . .00C to 70 0C BEIJING ESTEK ELECTRONICS CO.,LTD 1 ICL7116 Electrical Characteristics TA = 250C, fCLOCK = 48kHz, VREF = 100mV PARAMETER TEST CONDITIONS UNITS MIN. TYP. ±000.0 +000.0 MAX. SYSTEM PERFORMANCE Zero Input Reading VIN = 0V, Full Scale = 200mV Ratiometric Reading VIN = VREF, VREF = 100mV -VIN = +VIN ≅ 195mV Difference in Reading for Egual Positive and Negative Inputs Near Full Scale Full Scale = 200mV or Full Scale = 2V Maximum Deviation from Best Straight Line Fit (Note 5) VCM = ±1V, VIN = 0V, Full Scale = 200mV (Note 5) VIN = 0V, Full Scale = 200 mV (Peak-To-Peak Value Not Exceeded 95% of Time) (Note 5) VIN = 0 (Note 5) VIN = 0,00C To 700C (Note 5) 999 999/1000 1000 - ±0.2 ±1 Digital Reading Digital Reading Counts - ±0.2 ±1 Counts - 1 0.2 10 1 pA µV/0C 0 C To 700C (Note 5) VIN = 199mV, 0 VIN = 0 25kΩ Between Common and Positive Supply (With Respect to + Supply) 25kΩ Between Common and Positive Supply (With Respect to + Supply) (Note 5) - 1 5 ppm/0C - 1.0 1.8 mA Rollover Error Linearity Common Mode Rejection Ratio Noise Leakage Current Input Zero Reading Drift Scale Factor Temperature Coefficient V + Supply Current COMMON Pin Analog Common Voltage Temperature Coefficient of Analog Common DISPLAY DRIVER (ICL7116 ONLY) Peak-To-Peak Segment Drive Voltage Peak-To-Peak Backplane Drive Voltage NOTES: V+ = to V - = 9V, (Note 4) 1. Input voltages may exceed the supply voltages provided the input -000.0 - 50 - µV/V - 15 - µV 2.4 3.0 3.2 V - 80 - ppm/0C 4 5.5 6 V current is limited to ±100µA. 2. θJA is measured with the component mount ed on an evaluation PC board in free air. 3. Unless otherwise noted, s pecifications apply to both the ICL7116. ICL7116 is tested in the circuit of Figure 1. 4. Back plane drive is in phase with segment drive for ‘ off’segment, 180 degrees out of phase for ‘ on’segment. Frequency is 20 times conversion rate. Average DC component is less than 50mV. 5. Not tested, guaranteed by design. BEIJING ESTEK ELECTRONICS CO.,LTD 2 ICL7116 Absolute Maximum Ratings ICL7116, V+ to V- . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15V Analog Input Voltage (Either Input) (Note 1) . .... V+ to V- Reference Input Voltage (Either Input) . . . . . . . . . . . . . . . V+ to VClock Input Thermal Information Maximum Junction Temperature. . . . . . . . . . . . . . . . . . . . . . . 150 0C Maximum Storage Temperature Range . . . . . . . . . . -650 C to 1500 C Maximum Lead Temperature (Soldering 10s). . . . . . . . . . . . . 300 0 C (MQFP - Lead Tips Only) Typical Applications Circuit FIGURE 1. ICL7116 TEST CIRCUIT AND TYPICAL APPLICATION WITH LCD DISPLAY COMPONENTS SELECTED FOR 200mV FULL SCALE BEIJING ESTEK ELECTRONICS CO.,LTD 3 ICL7116 TYPICAL INTEGRATOR AMPLIFIER OUTPUT WAVEFORM (INT PIN) Address : 6A06--6A07 Rm 6A07,Changyin Office Building ,No.88,Yong Ding Road,Hai Dian District ,Beijing Postalcode:100039 Tel: 86-010-58895780 / 81 / 82 / 83 / 84 Fax : 010-58895793 Http://www.estek.com.cn Email:[email protected] REV No:01-060812 BEIJING ESTEK ELECTRONICS CO.,LTD 4