* MAX4231MACROMODEL * ------------------------------ * Revision 0, 10/2003 * Revision 1, 5/2012 * ------------------------------ * 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. The MAX4231 offer a SHDN feature that drives the * output low. * ------------------------------ * Connections * 1 = IN+ * 2 = VSS * 3 = IN- * 4 = OUT * 5 = SHDN * 6 = VDD ******************************* .SUBCKT MAX4231 1 2 3 4 5 6 XAMP1 6 2 1 3 4 5 OPAMP .ENDS ******************************* ******************************* .SUBCKT OPAMP 90 18 17 15 76 sh1 * 90 = VDD * 18 = VSS * 17 = IN+ * 15 = IN- * 76 = OUT * sh1 = SHDN ***************** *INPUT STAGE VS00 90 10 0 VS1 10 11 0V GBIAS 11 12 10 20 40U CBIAS 12 20 0.1P 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 55MHzs ****** 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 ************** *INPUT BIAS CURRENT IBIAS1 12 16 -.035n IBIAS2 12 15 -.085n *BIAS CURRENT & OFFSET *GAIN STAGE GA 21 20 14 13 17M 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 23 180.4P *DOMINANT POLE AT 100Hz EG1 20 18 10 18 0.1 GCP 22 20 110 20 10 *CMRR AND PSRR AC RESPONSE **************** EOUT 65 20 22 20 1 *VOLTAGE FOLLOWER ROUT1 65 66 0.01 *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 R54 54 18 10k ***************** *SUPPLY CURRENT *BIAS CURRENT DSUP 18 10 DB ISUP 10 18 0.585u 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 26.67U *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 ***************** Dl1 22 10 DA Dl2 18 22 DA D22a 67 22a DA E22a 22a 18 VALUE = { V(10)-0.73-sqrt(abs(temp-27))*0.91/67-I(VIS5)*2 } E22b 22b 18 VALUE = { V(18)+0.73+sqrt(abs(temp-27))*0.91/67-I(VIS5)*3.5-5m} D22b 22b 67 DA Ssh 75 76 54 18 smod .MODEL smod VSWITCH (RON=0.1 ROFF=1T VON=1 VOFF=0.5) Rout 76 18 10meg Gsh 90 18 VALUE = { I(VS00)*(V(sh1)-V(90))/V(90)+0.5u } Fsup0 10 18 VS1 -1 Gsup 10 18 90 18 0.1528m Isup0 10 18 -0.095m E90 w90 18 90 18 1 Esh sh1 54 VALUE = { (V(75)-V(76))*0.3*(V(w90)-V(sh1))-0.1 } ************************************************** .MODEL MOSFETN NMOS(VTO=5 KP=88E-2) .MODEL MOSFETP PMOS(VTO=-5 KP=88E-2) .MODEL MOSFET PMOS(VTO=-0.2 KP=71.7E-4 KF=3.5E-25 AF=0.6) .MODEL DA D IS=42E-12 .MODEL DX D(IS=100E-14 RS=0.5k ) .MODEL DB D(IS=100E-14) ************************************************** .ENDS * Copyright (c) 2003-2012 Maxim Integrated Products. All Rights Reserved.