MAAI/VI Low Power, 32 Digit A/D Converter General Description Features The Maxim [CL7137 is a monolithic analog to digital converter with all the necessary active devices to directly interface with a light emitting diode (LED) display. @ Improved 2nd Source! (see 3rd page for Maxim Advantage) Excluding the LED display current, the 1CL7137 supply Guaranteed first reading recovery from overrange current is under 200uA, making it suitable for battery @ Zero Input Gives Zero Reading operation. @ Drives LED Displays Directly Versatility and accuracy are inherent features of . | . . this converter. The dual-slope conversion technique Low Noise (15uV P-P) without hysteresis or automatically rejects interference signals common in 9 9 industrial environments. The true differential input and @ True Differential Reference and Input reference are particularly useful when making ratio- tape : metric measurements (ohms or bridge transducers), * Monolithic, Low Power CMOS Design and the zero-integrator phase in Maxims !CL7137 eliminates overrange hangover and hysteresis effects. Finally, this device offers high accuracy by lowering roliover error to less than one count and zero reading z z drift to less than 1nV/C. Ordering Information . . PART TEMP. RANGE PACKAGE Th devi b di Applications | ICL7137CPL OCto+70C = 40 Lead Plastic DIP ese devices can be used in a wide range of digita 3 3 panel meter applications. Most applications, however, in- lCL7137CJL oe to rere 40 Lead CERDIP volve the measurement and display of analog data: ICL7137CQH 0Cto+70C ~ 44 Lead Plastic Chip Carrier Pressure Conductance ICL7137C/D OC to +70C~sCDice Voltage Current Resistance Speed Temperature Materia) Thickness Typical Operating Circuit Pin Configuration Top View LEO vr e 40} OSC, DISPLAY i Di [2 33) OSC2 | hs C113 OSC . ~(LiLint | Bt ry (37) TEST ANALOG (LiLti "s Ay I [36] REF HI INPUT _ Fi Ce] 35] REF LO ae a (7 4] Ct Ree = E) (eq 33) CReF MAXIM vv De (a4 (32] COMMON 1CL7137 240K) Co fo} maxim [i INH Ws Be {CL7137 [30] IN LO Vee < rok > Ap Te P25) A/Z m 4 Fe [3] 78) BUFF Ti E2 4] 27] INT o -5y O3 [13] 26) V- ions 83 C8 Ge is L_, F3 (i? 24) C3 oH J ro anaos _& te Py] Ag 10S 1000'S - AB4 Lig] [22} 63 | POL [20 [21] GND (MINUS SIGN} (Detailed Circuit DiagramSee fast page} See last page for Plastic Chip Carrier Pin Configuration The Maxim Advantage" signifies an upgraded quality level. Atno 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. MMAXL/VI Maxim Integrated Products 1 ZELZTOIICL7137 ABSOLUTE MAXIMUM RATINGS Supply Voltage Vi... c cece cece eee e ence eee ne eee eeee +6V Power Dissipation (Note 2) None ee cece ener teen e eens -9V Cerdip Package ..........0 cece eee eeee 1000mW Analog Input Voltage (either input} (Note 1) .......... V* to V7 Plastic Package ....... eee eee eee ... 800mW Reference Input Voltage (either input) we VE to ve Operating Temperature Range ......... 0C to +70C Clock INPUt 6... ccc eee enone nes GND to vt Storage Temperature Range ........ -65C to +160C Lead Temperature (Soldering, 60 sec.) ........ +300C Note 1: Input voltages may exceed the supply voltages, provided the input current is limited to +100uA. Low Power, 3 Digit A/D Converter Note 2: Dissipation rating assumes device is mounted with all leads soldered to printed circuit board. Stresses above 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 above 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. ELECTRICAL CHARACTERISTICS (note 3) PARAMETERS CONDITIONS MIN TYP MAX UNITS : Vin = 0.0V -000.0 +000.0 +000.0 Digital Zero Input Reading Full Scale = 200.0mV Reading Ratiometric Reading Vin = V; Vrer = 100mV 999 9989/1000 1000 Digital IN YRer VREF Reading Rollover Error (Difference in -Vin = +Vin = 200.0mV -1 +0.2 +1 Counts reading for equal positive and negative reading near full scale) Linearity (Max. deviation from Full Scale = 200.0mV 1 ~0.2 +1 Counts best straight line fit) or full scale = 2.000V Common Mode Rejection Ratio Vom = + 1V, Viy = OV 30 BVI (Note 4) Full Scale = 200.0mV Noise (Pk-Pk value not exceeded Vin = OV, Full Scale = 200.0mV 15 uv 95% of time) Leakage Current @ Input Vin = 0 1 10 pA Zero Reading Drift Vin = OV, 0 < Ty < +70C 0.2 1 uV/eC Scale Factor Temperature Vin = 199.0mvV, 0C < Ty < +70C 1 5 ppm/C Coefficient (Ext. Ref. Oppm/C) V* Supply Current (Does not Vin = OV (Note 5) 70 200 include LED current) BA V7 Supply Current 40 Analog COMMON Voltage (With 250kQ. between Common and 2.6 3.0 3.2 Vv respect to positive supply) Positive Supply Temp. Coeff. of Analog COMMON 250k between Common and 80 ppm/C (with respect to Positive Supply) Positive Supply Segment Sinking Current vt =5.0V 5 8.0 (Except Pin 19} Segment Voltage = 3V mA (Pin 19 only} 10 16 Power Dissipation Capacitance vs. Clock Frequency 40 pF Note 3: Note 4: Note 5: Note 6: Unless otherwise noted, specifications apply at Ta=25C, foLtock=16kHz and are tested in the circuit of Figure 1. Refer to Differential Input discussion in the |CL7136 data sheet. 48kHz oscillator, Figure 2, increases current by 35uA (typ). Extra capacitance of CERDIP package changes oscillator resistor value to 470k or 150k (1 reading/sec or 3 readings/sec). The electrical characteristics above are a reproduction of a portion of intersils 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 manufacturer's data sheet have been included in this data solely for comparative purposes. 2 MAAIMMAALWI Low Power, 3!2 Digit A/D Converter @ Low Noise @ Negligible Hysteresis # Key Parameters Guaranteed Over Temperature @ Increased Maximum Rating for Input Current (Note 8) @ Guaranteed Overload Recovery Time @ Maxim Quality and Reliability @ Significantly Improved ESD Protection (Note 7) ABSOLUTE MAXIMUM RATINGS ELECTRICAL CHARACTERISTICS Specifications below satisfy or exceed all tested parameters on adjacent page. (V" = OV: Ty = 25C: foLock = 16kHz; test circuit - Figure 1 unless noted.) This device conforms to the Absolute Maximum Ratings on adjacent page. | PARAMETERS CONDITIONS MIN TYP MAX UNITS Zero Input Reading Vin = 0.0V, Full Scale = 200.0mV | T, = 25C (Note 9) -000.0 +000.0 +000.0 Digital 0 < Tg = 70C (Note 10) -000.0 +000.0 +000.0 Reading Ratiometric Reading Vin = Vace: Veer = 1t0OmV Ta = 25C (Note 9) 999 999/1000 1000 Digital 0 < T, = 70C (Note 10) 998 999/1000 1001 Reading Rollover Error (Difference in -Vin = +Vin = 200mV reading for equal positive and Ta = 25C (Note 9) -1 +0.2 +1 Counts negative reading near Full Scale) 0 <= Ta = +70C (Note 10) +0.2 Linearity (Max. deviation from Full Scale = 200.0mV -1 +0.2 +1 Counts best straight line fit} or full scale = 2.000V Common Mode Rejection Ratio Vom = + 1V, Vin = OV _ + Full Scale = 200.0mV 100 +5 +100 wv Noise (Pk-Pk value not exceeded Vin = OV Vv 95% of time) Full Scale = 200.0mV 10 a Input Leakage Current Vin = 9, Ta = 25C (Note 9) 1 10 pA 0 <= Ta = +70C 200 Zero Reading Drift Vin = OV, 0 = Ta S 70C (Note 9) 0.2 1 BVP Scale Factor Temperature Vin = 199.0mV Coefficient 0 < Ty = +70C 1 5 ppm/C (Ext. Ref. Oppm/C}(Note 9) v* Supply Current Vin = OV Tay = 25C 60 200 BA O < Ty = 70C 240 V~ Supply Current Vin = OV, 60 200 vA Analog Common Voltage (with 250k between Common & 2.6 2.8 3.2 Vv tespect to Pos. supply) Pos. Supply Temp. Coeff. of Analog Common 250k between Common & 75 ppm/C (with respect to Pos. Supply) Pos. Supply Segment Sinking Current vt =5.0V 5 8.0 mA {Except Pin 19) Segment Voltage = 3V {Pin 19 only) 10 16 mA Test Pin Voltage With Respect to ve 4 5 6 Vv Overload Recovery Time Vin changing from = 10V 0 1 Measurement (Note 11) to OV Cycles All pins are designed to withstand electrostatic discharge (ESD) levels in excess of 2000V. (Test circuit per Mil. Std. 883C. ZELZTOI Note 7: Method 3015.2) Note8: Input voltages may exceed the supply voltage provided the input current is limited to +1mA (This revises Note 1 on adjacent page). Note 9: Test condition is Viy applied between the Analog Input pins (Figure 1}. Note 10: 1M resistor is removed in Figures 1 and 2. Note 11: Number of measurement cycles for display to give accurate reading. MAXAILSVI 3ICL7137 Low Power, 3!2 Digit A/D Converter Detailed Description The Maxim ICL7137 3% digit A/D converter is similar to the Maxim |CL7136 except for the LED segment driver outputs, and is similar to the ICL7107 except for much reduced power supply currents (exclusive of the LED currents.) For a detailed product description, compo- nent value selection, and package dimensions, refer to Maxim's ICL7136 data sheets; for applications informa- tion refer to Maxims ICL7107 data sheets. OluF Leo 44 33 DISPLAY IM) 3) Cher Owner LILI +OW- 4 IN HI 2-19 { { { { ANALOG Ole 22-25 A= INPUT _ 30) Ww io POL eo 22) comMON it ve O +5V 240k (2 28) ure 180k0) & O47 F 0 nee wi [28 VRE Stoke 0.22 uF rye REF LOL 22 2 C24 ny v-]26 OSCz 08C3 OSC; 0 -5V 39/38 Cosc | 40 MAXI Rose * ~ TO ANALOG (CL7137 cote) Supe COMMON (PIN 32] | FULL SCALE INPUT 200.0 mV Vaer | 100.0mV | Figure 1. Maxim 1CL7137 Typical Operating Circuit Clock Frequency 16kHz (1 reading/sec) Chip Topography Og E2 Fe Ag Be C2 D2 Ey Gi Fi sale en eae By Al F3 cl E3 C1 AB, Q e : E POL OSC) & E ono o3 G3 Ag OSC3 C3 TEST & REF HI REF LO COMMON C*per 0.130" {3.30 mm) OluF LED 34 DISPLAY IMO gy C*rer C~Rer LILI +O ntl 2-19 [SEGMENT tcl ANALOG O01 uf 22-25 LORIVE a INPUT _ 30 wi POL oS GND 32) common p ve + +5V 28 240k1) BUFF 1802) $ O47 uF "4 ner wi (35 VaEF < yoKs re ner Lo} 4 Oost oy int v-[26 O8C208C3 OSC; 0-5 39.138 Cosc | 40 MAKIMW Rosc ~e-) TO ANALOG ICL7137 Tro) Snr SOMMON (PIN 321 FULL SCALE INPUT Veer | 200.0 mv 100.0mv_ | Figure 2. Maxim 1CL7137 Typical Operating Circuit Clock Frequency 48kHz (3 reading/sec) Pin Configuration eecat gies ZSsovuearFtoocr ac felled lelfe1/2) =] Ao oO [39] REF LO & [a] [38] C*per & [3] [37] C ner O, [0] [36] COMMON Ce fT] [35] IN HI ne [2] MAXIM aa] NC By [a3 1CL7137 [a3] INLO Ao a] [32] A/Z Fo G5] [at] BUFF Fe [6 | 30) INT 03 [a7 {29} v- lelleligiialisi(elsl[al[s|[al[s aregsee2ss 44 Lead Plastic Chip Carrier (Quad Pack) Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. 4 MAAS