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| ES5106 3 1/2 DIGIT A/D CONVERTER W/LCD GENERAL DESCRIPTION The ES 5106 is a low power monolithic CMOS 3 1/2 digit LCD display A/D converter. The single chip ES 5106 provides all necessary active devices which contains the internal clock, voltage reference, sevensegment decoders, LCD display drivers and a back plane driver. The improved internal zener reference voltage circuit gives the analog common a small temperature coefficient of 60 ppm/ typically. The high accuracy characteristics of the ES5106 perform very low linearity error and rollover error. The high input impedance (>1012) and low input leakage current (1pA typical) give the ES5106 a good application in the field of high impedance circuit measurement. The differential input and reference are suitable for measuring bridge transducer or ohms by using ratiometric method. The dual slope conversion technique makes the ES5106 a good normal and common mode rejection ratio. With a suitable oscillator frequency, the ES5106 has a high rejection of 50HZ, 60HZ and 400HZ line frequency noise. With single power supply, a few passive components and a LCD display, ES5106 can be built as a high performance panel meter. Existing TSC7106 or ICL7106 based systems may be upgraded without changing external, passive component values. 1 03/05/14 ES5106 3 1/2 DIGIT A/D CONVERTER W/LCD FEAUTRES Guaranteed zero reading with zero input Low input leakage current (1pA typical) Internal Reference with low temperature drift (60ppm/ typial) Low noise (15Vp-p typical) Direct LCD display driver-no external components required Differential input and voltage reference Precision null detection with true polarity at zero Internal clock circuit No additional active circuits required APPLICATIONS Digital panel meters Digital multimeters Thermometers Capacitance meters pH meters Photometers 2 03/05/14 ES5106 3 1/2 DIGIT A/D CONVERTER W/LCD E T 3 03/05/14 ES5106 3 1/2 DIGIT A/D CONVERTER W/LCD PIN ASIGNMENT 44-pin QFP package COMMON C+REF C-REF REFHI REFLO BUFF INLO INMI A.Z INT V- NC NC TEST NC G2 C3 ES5106Q OS3 NC OS2 OS1 V+ D1 C1 B1 A3 G3 BP POL AB4 E3 F3 B3 A1 F1 G1 E1 B2 A2 F2 D3 D2 C2 E2 4 03/05/14 ES5106 3 1/2 DIGIT A/D CONVERTER W/LCD PIN ASSIGNMENT 40-pin DIP package 5 03/05/14 ES5106 3 1/2 DIGIT A/D CONVERTER W/LCD Pin Description Pin No Symbol Description 1 V+ Positive supply voltage. Connecting to battery positive terminal. 2 D1 LCD segment line. 3 C1 LCD segment line. 4 B1 LCD segment line. 5 A1 LCD segment line. 6 F1 LCD segment line. 7 G1 LCD segment line. 8 E1 LCD segment line. 9 D2 LCD segment line. 10 C2 LCD segment line. 11 B2 LCD segment line. 12 A2 LCD segment line. 13 F2 LCD segment line. 14 E2 LCD segment line. 15 D3 LCD segment line. 16 B3 LCD segment line. 17 F3 LCD segment line. 18 E3 LCD segment line. 19 AB4 LCD segment line. 20 POL LCD segment line. 21 BP LCD Backplane. 22 G3 LCD segment line. 23 A3 LCD segment line. 24 C3 LCD segment line. 25 G2 LCD segment line. 26 VNegative supply voltage. Connecting to battery negative terminal. 27 INT Integration cycle output. 28 BUFF Integration resistor connection for buffer output. 29 A.Z Auto-zero capacitor connection. 30 IN LO Low analog input signal connection. 31 IN MI High analog input signal connection. 32 COMMON Set the common-mode voltage for the system 33 C+REF Positive capacitor connection for on-chip DC-DC converter. 34 C-REF Negative capacitor connection for on-chip DC-DC converter. 35 REF LO Low differential reference input connection. 36 REF HI High differential reference input connection. 37 TEST Pull high to V+ all LCD segments will be activated. 38 OS3 Crystal oscillator connection. 39 OS2 Crystal oscillator connection. 40 OS1 Crystal oscillator connection. 6 03/05/14 ES5106 3 1/2 DIGIT A/D CONVERTER W/LCD ABSOLUTE MAXIMUM RATINGE Characteristic Supply Voltage (V+ to V-) Analog Input Voltage (either input) Reference Input Voltage (either input) Clock Input Power Dissipation (plastic package) Operating Temperature Storage Temperature Lead Temperature(soldering, 10 sec) Rating 12V V+ to VV+ to VTEST to V+ 800mW 0 to +70 -65 to +160 270 ELECTRICAL CHARACTERISTICS Characteristic Zero Input Reading Test Condition VIN=0.0V Full-Scale=200.0mV Ratiometric Reading Linearity VIN=VREF, VREF=100mV Full-Scale=200mV Limit Min. -000.0 999 -1 Typ. 000.0 999/1000 0.2 Max. +000.0 1000 1 Units Digital Reading Digital Reading Counts (Max. deviation from or Full-Scale=2.000V best straight line fit) 7 03/05/14 ES5106 3 1/2 DIGIT A/D CONVERTERW/LCD ELECTRICAL CHARACTERISTICS (continued) Characteristic Roll-Over Error Common Mode Rejection Ratio Noise Test Condition -VIN=+VIN200.0mV VCM=1V,VIN=0V Full-Scale=200.0mV VIN=0V,FullScale=200.0mV Input Leakage Current VIN=0V Zero Reading Drift Scale Factor Temperature Coefficient Analog Voltage (with respect to V+) Analog COMMON Temperature Coefficient Segment Voltage Back Voltage Supply Current (Does VIN=0V not include COMMON current) 0.5 0.65 mA plane Drive V+ to V-=9V 4 5 6 V VIN=0V,0TA+70 VIN=199.0mV,0TA +70 Ext.Ref.=0ppm/ COMMON 25K Between Common and Positive Supply 25K Between Common and V+,0TA70 Drive V+ to V-=9V 4 5 6 V 60 75 ppm/ 2.8 3.0 3.2 V 1 5 ppm/ 1 0.2 10 1 pA V/ 15 Vp-p Limit Min. -1 Typ. 0.2 50 Max. +1 Units Counts V/V 8 03/05/14 ES5106 3 1/2 DIGIT A/D CONVERTER W/LCD Operation Mode Analog Common The Common pin is used to set the common-mode voltage for the system in which the input signals are floating with respect to the power supply of the ES5106. In all most of the applications, IN LO, REF LO and COMMON pins are tied to the same point, so that the common mode voltage can be removed from the reference system and the converter. In some applications, IN LO may not at the same point with COMMON and thus a common mode voltage exists in the system, the high CMRR (86db typical) of the ES 5106 can take care of this common mode voltage. Neverthereless, it should be care to prevent the output of the integrator from saturation. The COMMON pin is also used as a voltage reference. It sets a voltage which is around 2.9 volts more negative than the positive supply. The COMMON voltage of ES5106 has a 0.001 %/% voltage coefficient and a low output impedance of 15 typical. The analog COMMON is tied internally to an N channel FET capable of sinking 30mA. This FET will hold the COMMON voltage at 2.9 volts when an external load attempt to pull the COMMON voltage toward the positive supply. 9 03/05/14 ES5106 3 1/2 DIGIT A/D CONVERTER W/LCD The source current of COMMON is only 10A, so it is easy to pull COMMON voltage to a more negative voltage with respect to the positive supply. When the total supply voltage is large enough to cause the zener to regulate(>7V), the COMMON voltage will have a low temperature cofficient typically less than 60 ppm/. This voltage can be used to generate the ES5106 reference voltage and an external voltage reference will be unnecessary in most cases. Reference Voltage For a 1000 counts reading, the input signal must be equal to the reference voltage. So for a 2000 counts full-scale reading, it requires the input signal be twice the reference voltage. Thus, for the 200mV and 2.000V full-scale, the reference voltage should equal 100.0mV and 1.000V, In some applications the full-scale input voltage may be other than 200mV or 2V, but 600mV, for example, The reference voltage should be set to 300 mV and the input signal can be used directly without being divided. The differential reference can be used during the measurment of resistor by the ratiometric method and when a digital reading of zero is desired for VIN0. A compensating offset voltage can be applied between COMMON and IN LO and the voltage of being measured is connected between COMMON and IN HI. 10 03/05/14 ES5106 3 1/2 DIGIT A/D CONVERTER W/LCD System Timing The oscillator frequency is divided by four prior to clocking the internal decade counters. The signal integrate takes a fixed 1000 counts time period which is equal to 4000 clock pulses. The back plane drive signal is derived by dividing clock frequency by 800. To make a maximum rejection of line frequency (60Hz or 50Hz) noise pickup, the signal integrate period should be a multiple of the line frequency period. For 600Hz noise rejection, oscillator frequencies of 120KHz, 80KHz, 60KHz, 48KHz, 40KHz, etc. should be selected. For 50Hz rejection, oscillator frequencies of 100KHz, 50KHz, 40KHz, etc. would be suitable. For all ranges of frequency Rosc should be 100K, Cosc is selected from the approximate equation f=0.45/RC. For 48KHz clock (3readings/second), Cosc=100PF. Integrating Resistor The input buffer amplifier and integrator both have class A output stage with 100A of quiescent current and can supply 20A drive currents with negligible linearity errors. The integrating resistor should be chosen to remain in the output stage linear drive region. It should be noticed that the integrating resistor should not be so large such that the leakage currents of printed circuit board will induce errors. For a 200mV full-scale the recommended integrating resistor value is 47K and for 2V full-scale is 470K. 11 03/05/14 ES5106 3 1/2 DIGIT A/D CONVERTER W/LCD Integrating Capacitor The integrating capacitor should be selected to maximize integrator output voltage swing without causing output saturation. If the analog COMMON is used as voltage reference, a2V full-scale integrator output swing is satisfactory. For 3 readings/second (48KHz clock) a 0.22F value of CINT is suggested. When different oscillator frequencies are used, CINT must be changed in inverse proportion to maintain the nominal 2V integrator swing. The integrating capacitor should have low dielectric absorption to minimize roll-over error. An inexpensive polypropylene capacitor will work well. Auto-Zero Capacitor The auto-zero capacitor size has some influence on system noise. A 0.47F capacitor is recommended for 200mV full scale where noise is very important. A 0.047F capacitor is adequate for 2V full scale aplications. A mylar type dielectric capacitor is adequate. Reference Voltage Capacitor When IN LO is tied to analog COMMON, a 0.1F capacitor adequate to be the reference capacitor. If a large common-mode voltage exists and the application require a 200mV full scale, a larger value is required to prevent roll-over error. A 1.0 F capacitor will hold the roll-over error to 0.5 count. 12 03/05/14 ES5106 3 1/2 DIGIT A/D CONVERTER W/LCD TEST The TEST pin is tied to the internally generated digital supply through a 500 resistor. It's potential is 5V less than V+. Thus TEST may be used as the negative power supply connection for externally generated segment drivers. The TEST pin load should be no more than 1 mA. If TEST is pulled high to V+ all segments plus the minus sign will be activated and the display should read-1888. For such operation, the segment have a constant DC voltage and may destroy the LCD display if left in this mode for several minutes. Segment Drivers For 3 readings/second (48KHz clock) the BP frequency is a 60Hz square wave with a nominal amplitude of 5V. The segments are driven at the same frequency and amplitude and are in phase with BP when OFF, but out of phase when ON. In all cases neglible DC voltage exists across the segments. The polarity inidication is "ON" for negative voltage inputs. 13 03/05/14 ES5106 3 1/2 DIGIT A/D CONVERTER W/LCD TEST CIRCUIT 14 03/05/14 ES5106 3 1/2 DIGIT A/D CONVERTER W/LCD APPLICATION CIRCUITS (1) This circuit uses analog COMMON voltage as reference voltage. Values here are for 200.0mV full scale, 3readings/sec. 15 03/05/14 ES5106 3 1/2 DIGIT A/D CONVERTER W/LCD (2) The values of this circuit are for 2.000V full scale, 3 readings/sec. 16 03/05/14 ES5106 3 1/2 DIGIT A/D CONVERTER W/LCD (3) The circuit is for measuring ratiometric values of quad loadcell. 17 03/05/14 ES5106 3 1/2 DIGIT A/D CONVERTER W/LCD (4) This circuit is a digital centigrade thermometer. The temperature sensor is a silicon diode-connected transistor which has a temperature coefficient of about-2mV/. 18 03/05/14 ES5106 3 1/2 DIGIT A/D CONVERTER W/LCD (Package) 44-pin QFP package 19 03/05/14 ES5106 3 1/2 DIGIT A/D CONVERTER W/LCD 40-pin DIP package 20 03/05/14 |
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