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HI7131CPL Datasheet(PDF) 10 Page - Intersil Corporation |
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HI7131CPL Datasheet(HTML) 10 Page - Intersil Corporation |
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10 / 21 page  3-1835 HI7131/33 vs ICL7136/37 Figure 5 shows the analog front end block diagram of both HI7131/33 and ICL7136/37. The difference is the common reference voltage generator connection and 2 extra analog switches in the ICL7136. The HI7131 architecture uses the INLO as the reference point of the integrator (non-inverting input of the integrator amplifier) in all the phases of the con- version cycle. The ICL7136 uses INLO as a reference point only during integration cycle and COMMON pin is used as the integrator reference point during auto-zero, deintegrate, and zero integrate phases. The circuit configuration of the HI7131 results in a superior 120dB rejection of DC common mode on the inputs. How- ever, the HI7131 has reduced AC common mode noise rejection, since the noise on the INLO input can cause errors during the deintegration phase. The circuit configuration of the ICL7136 is unaffected by the AC noise riding on the inputs, but the DC common mode rejection on the input is only 86dB. FIGURE 93A. HI7131 AND HI7133 ANALOG SECTION FUNCTIONAL DIAGRAM FIGURE 93B. ICL7136 AND ICL7137 ANALOG SECTION FUNCTIONAL DIAGRAM FIGURE 93. HI7131, HI7133 vs ICL7136, ICL7137 ANALOG SECTIONS DE- DE+ VCOMMON GENERATOR POLARITY FLIP-FLOP ZERO CROSSING DETECTOR V - 26 CINT CAZ RINT BUFF A-Z INT V+ AZ COMPARATOR INHI COMMON INLO 31 32 30 DE- DE+ INT AZ 34 CREF+ 36 REFHI CREF REFLO 35 AZ AND ZI AZ AND ZI ZI INPUT HIGH 33 CREF- 28 29 27 V+ TO DIGITAL SECTION V- INTEGRATOR 1 - + - + - + DE- DE+ VCOMMON GENERATOR POLARITY FLIP-FLOP ZERO CROSSING DETECTOR V - 26 CINT CAZ RINT BUFF A-Z INT V+ - + AZ COMPARATOR INHI COMMON INLO 31 32 30 DE- DE+ INT AZ 34 CREF+ 36 REFHI CREF REFLO 35 AZ AND ZI AZ AND ZI ZI INPUT HIGH 33 CREF- 28 29 27 V+ TO DIGITAL SECTION AZ AND DE ± AND ZI V- INTEGRATOR 1 - + - + HI7131, HI7133 |
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