1 ICL7135 4 / Digit A/D Converter with 2 Multiplexed BCD Outputs General Description Benefits and Features The Maxim ICL7135 is a high precision monolithic Improved 2nd Source 1 4 / digit A/D converter. Dual slope conversion reliabil- (See our Maxim Advantage Page 3) 2 ity is combined with 1 in 20,000 count accuracy and 20,000 Count Resolution a 2.0000V full scale capability. It features high imped- Guaranteed 1 Count accuracy ance differential inputs, nearly ideal differential linearity, Over-range, under-range signals for auto-range true ratiometric operation, auto zero and auto-polarity. The multiplexed BCD outputs and digit drivers provide capability easy interface to external display drivers like the Maxim Easy interface to UARTs and Ps ICM7211A. The only other external components needed TTL compatible, Multiplexed BCD outputs to make precision DVM/DPMs are a reference and a True differential input. Zero reading guaranteed for clock. For more complex systems the BCD outputs are 0 volt Input enhanced by STROBE, OVERRANGE, UNDERRANGE, RUN/HOLD and BUSY lines providing easy interface to True polarity at zero for precise null detection microprocessors and UARTs. This interfacing capability Monolithic CMOS Design makes the ICL7135 an ideal device for use in micropro- cessor based data acquisition and control systems. Ordering Information The ICL7135 has auto-zero accuracy better than 10V, PART TEMP. RANGE PIN-PACKAGE zero drift of 0.5V/C, input bias current of 10pA max. and ICL7135CJI 0C to 70C 28 Lead CERDIP rollover error of less than 1 count. ICL7135CPI 0C to 70C 28 Lead Plastic DIP Applications ICL7135CQI 0C to 70C 28 Lead Plastic chip carrier This device is used in a wide range of measurement ICL7135C/D 0C to 70C Dice applications involving the manipulation and display of analog data: Pressure Weight Voltage Current Resistance Speed Temperature Material Thickness Pin Configuration Typical Operating Circuit V- 1 28 UNDERRANGE REFERENCE 2 27 OVERRANGE OR BRT D1 D1 28 SEGMENT DRIVERS ANALOG COMMON 3 26 STROBE D2 D2 INT OUT 4 25 R/H D3 D3 AZ IN 5 ICL7135 24 DIGITAL GND D4 ICL7135 D4 BUFF OUT 6 23 POL D5 ICM7212 REF. CAP- 7 22 CLOCK IN LED DISPLAY STROBE REF. CAP+ 8 21 BUSY B8 B3 B4 B2 IN LO 9 20 (LSD) D1 B2 B1 IN HI 10 19 D2 B1 B0 POL V+ 11 18 D3 (MSD) D5 12 17 D4 D Q (LSB) B1 13 16 (MSB) B8 B2 14 15 B4 D Q NOTE: ALL PACKAGES HAVE THE SAME PINOUT. The Maxim Advantage signifies an upgraded quality level. At no additional cost we offer a second-source device that is subject to the following: guaranteed performance over temperature along with tighter test specifications on many key parameters and device enhancements, when needed, that result in improved performance without changing the functionality. 19-5041 Rev 1 9/161 ICL7135 4 / Digit A/D Converter with 2 Multiplexed BCD Outputs Absolute Maximum Ratings Power Dissipation (Note 2) Lead Temperature (Soldering, 10 sec) ..............................300C CERDIP Package .....................................................1000mW Supply Voltage V+ ................................................................+6V Plastic Package ...........................................................800mW V- ................................................................. -9V Operating Temperature ..........................................0C to +70C Analog Input Voltage (either input) (Note 1)...................V+ to V- Storage Temperature ...................................... -65C to + 160C Reference Input Voltage (either input) ..........................V+ to V- Clock Input ..................................................................Gnd to V+ Note 1: Input voltages may exceed the supply voltages provided the input current is limited to +100A. Note 2: Dissipation rating assumes device is mounted with all leads soldered to printed circuit board. 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 1) ICL7135 Electrical Characteristics (V+ = +5V, V- = -5V, T = 25C, Clock Frequency Set for 3 Reading/Sec) A CHARACTERISTICS SYMBOL CONDITIONS MIN TYP MAX UNITS V = 0.0V Digital IN Zero Input Reading -0.0000 0.0000 +0.0000 Full Scale = 2.000V Reading V = V Digital IN REF Ratiometric Reading (Note 2) +0.9995 +0.9999 +1.0000 Full Scale = 2.000V Reading Linearity over Full Scale Digital -2V V +2V 0.5 1 IN (Error of Reading from Best Straight Line) Count Error Differential Linearity (Difference Between Worst- -2V V +2V .01 LSB IN Case Step of Adjacent Counts and Ideal Step) ANALOG (Note 1) Rollover error (Difference in Reading for Equal Digital -V V 2V 0.5 1 IN IN (Note 2) Positive and Negative Voltage Near Full Scale) Count Error V = 0V IN Noise (P-P Value Not Exceeded 95% of Time) e 15 V n Full Scale = 2.000V Leakage Current at Input I V = 0V 1 10 pA ILK IN V = 0V IN Zero Reading Drift 0.5 2 V/C 0 T +70C A V = +2V IN Scale Factor Temperature TC 0 T +70C 2 5 ppm/C A Coefficient (Note 3) (ext. ref. 0 ppm/C) V 2.8 2.2 V INH V 1.6 0.8 INL INPUTS Clock In, Run/Hold I V = 0V 0.02 0.1 mA INL IN I V = +5V 0.1 10 A INH IN All Outputs V I = 1.6mA 0.25 0.40 V OL OL B , B , B , B 1 2 4 8 V I = -1mA 2.4 4.2 V OH OH D , D , D , D , D OUTPUTS 1 2 3 4 5 DIGITAL BUSY, STROBE, OVER-RANGE, V I = -10A 4.9 4.99 V OH OH UNDER-RANGE, POLARITY +5V Supply Range V+ +4 +5 +6 V -5V Supply Range V- -3 -5 -8 V SUPPLY +5V Supply Current I+ f = 0 1.1 3.0 C mA -5V Supply Current I- f = 0 0.8 3.0 C Power Dissipation Capacitance C vs. Clock Freq 40 pF PD Clock Clock Frequency (Note 4) DC 2000 1200 kHz 1 Note 1: Tested in 4 / digit (20,000 count) circuit shown in Figure 1, clock frequency 120kHz. 2 Note 2: Tested with a low dielectric absorption integrating capacitor. See Component Selection Section. Note 3: The temperature range can be extended to +70C and beyond as long as the auto-zero and reference capacitors are increased to absorb the higher leakage of the ICL7135. Note 4: This specification relates to the clock frequency range over which the ICL7135 will correctly perform its various functions. See Max Clock Frequency below for limitations on the clock frequency range in a system. The electrical characteristics above are a reproduction of a portion of lntersils copyrighted (1983/1984) data book. This information does not constitute any representation by Maxim that Intersils products will perform in accordance with these specifications. The Electrical Characteristics Table along with the descriptive excerpts from the original manufacturers data sheet have been included in this data sheet solely for comparative purposes. Maxim Integrated 2 www.maximintegrated.com