* MAX4234 MACROMODEL * ------------------------------ * Revision 0, 10/2003 * ------------------------------ * The MAX4230 family of op amps are high-output drive CMOS op amps feature 200mA of peak * output current and Rail to Rail inputs. These devices operate from 2.7V to 5.5V supply * and feature Rail to Rail outputs. * ------------------------------ * Connections * 1 = OUT1 * 2 = IN1- * 3 = IN1+ * 4 = VDD * 5 = IN2+ * 6 = IN2- * 7 = OUT2 * 8 = OUT3 * 9 = IN3- * 10 = IN3+ * 11 = VSS * 12 = IN4+ * 13 = IN4- * 14 = OUT4 ************************************************* .SUBCKT MAX4234 1 2 3 4 5 6 7 8 9 10 11 12 13 14 XAMP1 4 11 3 2 1 OPAMP XAMP2 4 11 5 6 7 OPAMP XAMP3 4 11 10 9 8 OPAMP XAMP4 4 11 12 13 14 OPAMP .ENDS ************************************************* ************************************************* .SUBCKT OPAMP 10 18 17 15 75 * 10 = VDD * 18 = VSS * 17 = IN+ * 15 = IN- * 75 = OUT ***************** *INPUT STAGE VS1 10 11 0V IBIAS 11 12 139.5U M1 13 16 12 11 MOSFET M2 14 15 12 11 MOSFET DBIAS 18 12 DA VOS 19 16 0.85M *INPUT OFFSET VOLTAGE ERDC 19 17 111 20 1 RD1 13 18 1K RD2 14 18 1K C1 13 14 1.44P *SECOND ORDER POLE AT 55MHz ****** DIN1 16 11 DX *INPUT VOLTAGE LIMITING DIODES DIN2 18 16 DX DIN3 15 11 DX DIN4 18 15 DX RIN1 16 20 1G RIN2 15 20 1G CIN1 16 20 8P CIN2 15 20 8P ****** FSUP 18 10 VS1 1 *TO COMPENSATE SUPPLY CURRENT ECHK 199 20 13 14 1 ************** *INPUT BIAS CURRENT IBIAS1 12 16 50P IBIAS2 12 15 100P *BIAS CURRENT & OFFSET ************************************************** *GAIN STAGE GA 21 20 14 13 10M RO1 21 20 1K GB 22 20 21 20 1 RO2 22 20 10K EF 23 20 22 20 1 *VOLTAGE FOLLOWER FOR FEEDBACK RLF 23 20 10MEG CC 21 23 139.4P *DOMINANT POLE AT 100Hz EG1 20 18 10 18 0.5 GCP 22 20 110 20 10 *CMRR AND PSRR AC RESPONSE ***************** DVL1 22 33 DA *VOLTAGE LIMITING VMIN1 59 33 0V DVL2 34 22 DA VMIN2 34 60 0V ELIM2 59 61 10 18 0.5 ELIM1 63 60 10 18 0.5 ECOMP2 62 20 65 66 1 ECOMP1 64 20 65 66 1 HCOMP2 62 61 VIS3 13.474 HCOMP1 64 63 VIS3 11.14 **************** EOUT 65 20 22 20 1 *VOLTAGE FOLLOWER ROUT1 65 66 12.5 *OPEN LOOP OUTPUT IMPEDENCE VIS3 66 67 0V RLOAD 67 20 10MEG ***************** *CURRENT LIMIT DSC1 67 68 DA DSC2 69 67 DA DSC3 69 70 DA DSC4 70 68 DA ISC1 68 69 200MA *LIMITING CURRENT T0 200MA RSC 68 69 10MEG ***************** VIS5 70 75 0V ***************** *SUPPLY CURRENT *BIAS CURRENT DSUP 18 10 DB ISUP 10 18 1.2MA *BIAS CURRENT *LOAD CURRENT FSUP1 20 77 VIS5 1 CSUP 77 20 1P DSUP1 20 77 DB DSUP2 77 78 DB VIS4 78 20 0V FSUP2 10 18 VIS4 1 ***************** *PSRR DC AND AC ESUP1 79 20 10 18 1 CPA 79 115 10P RPA 115 20 1.224K GPSRR1 110 20 115 20 0.1 *AC GPSRR2 111 20 79 20 44.67U *DC -86dB RRDC 111 20 1 RRAC 110 20 1 ***************** *CMRR DC ECM1 81 20 12 20 1 GCM2 20 111 81 20 316.2U *DC -70dB ***************** *MAX COMMON MODE INPUT AT VDD DIL 12 83 DA RIL 83 84 50 VIL 85 84 -0.3V EIL 85 18 10 18 1 ***************** *MINIMUM SUPPLY VOLTAGE SET AT 2.7 DVL3 18 12 DA DVL4 12 86 DA FVL 86 18 VIS6 1 VVL 87 18 2.7V VIS6 87 88 0V DVL5 88 89 DA RVL 89 90 300 EVL1 90 18 10 18 1 ************************************************** .MODEL MOSFET PMOS(VTO=-0.2 KP=71.7E-4 KF=2.5E-26 AF=0.5) .MODEL DA D(N=0.1M) .MODEL DX D(IS=100E-14 RS=0.5k) .MODEL DB D(IS=100E-14) ************************************************** .ENDS