* AD8428 SPICE Macro-model * Description: Amplifier * Generic Desc: 36V Fixed G=2000 Wide Bandwidth Low Noise In-Amp with Filter Pins * Developed by: ADI - LPG * * Revision History: * A (12/2014) - SH (Original Model) * Copyright 2014 by Analog Devices. * * Refer to http://www.analog.com/Analog_Root/static/techSupport/designTools/spiceModels/license/spice_general.html for License Statement. Use of this model * indicates your acceptance with the terms and provisions in the License Statement. * * BEGIN Notes: * * Not Modeled: * Temperature effects * PSRR * * Parameters Modeled Include: * Gain error, Vos, Ibias * Bandwidth * Voltage and current noise with 1/f noise * CMRR vs frequency * Supply current incl preamp and output load currents * Output clamp vs load * Input range and internal voltage limitations * Slew Rate * Pulse response vs cap load * Input impedance * * Typical Specifications from ±15V Table Used in Model * * END Notes * * Node Assignments * inverting input * | negative filter pin * | | positive filter pin * | | | non_inverting input * | | | | negative supply * | | | | | ref * | | | | | | output * | | | | | | | positive supply * | | | | | | | | .SUBCKT AD8428 IN- -FIL +FIL IN+ -Vs REF VOUT +Vs *** INPUT STAGE *** FIBIAS1 IN- 0 POLY(1) V21 55.0E-9 1.5E-3 H3 4 IN- V24 0.939 G4 0 5 4 0 132.2E-3 R10 5 0 7.566 D7 5 9 D D8 10 5 D V7 10 VNEGx 2.54 V8 VPOSx 9 2.54 E8 22 0 5 0 1 FIBIAS2 IN+ 0 POLY(1) V23 45.0E-9 1.5E-3 VOSI 7 IN+ -25.0E-6 G5 0 8 7 0 132.2E-3 R11 8 0 7.566 D9 8 9 D D10 10 8 D E9 15 0 8 0 1 G1 IN+ 0 POLY(2) (IN+, VMID) (IN+, IN-) 0 1.0E-9 500.0E-12 G2 IN- 0 POLY(2) (IN-, VMID) (IN-, IN+) 0 1.0E-9 500.0E-12 CCM1 IN+ 0 2.0E-12 CCM2 IN- 0 2.0E-12 * *** PREAMPLIFIER STAGE *** RG RG+ RG- 30.1508 GN1 Pos_Fdbk 16 15 16 25.7E-3 VSH1 RG+ 16 -0.774 IBOT1 RG+ -Vs 660.0E-6 C4 RG+ 0 3.535E-12 R6 RG+ 17 3000.0 VCS2 noninverting_out 17 0 I1 VBIAS Pos_Fdbk 660.0E-6 R23 Pos_Fdbk VBIAS 1E9 G7 0 18 VBIAS Pos_Fdbk 1 R8 18 0 10E9 C2 noninverting_out Pos_Fdbk 4.203E-12 R25 19 18 100 D5 19 20 D D6 21 19 D V5 21 VNEGx 1.75 V6 VPOSx 20 1.35 GN2 Inv_Fdbk 23 22 23 25.7E-3 VSH2 RG- 23 -0.774 IBOT2 RG- -Vs 660.0E-6 C3 RG- 0 3.538E-12 R5 RG- 24 3000.0 VCS1 Inverting_Out 24 0 I2 VBIAS Inv_Fdbk 660.0E-6 R18 VBIAS Inv_Fdbk 1E9 G6 0 25 VBIAS Inv_Fdbk 1 R7 25 0 10E9 C1 Inverting_Out Inv_Fdbk 4.232E-12 R24 26 25 100 D3 26 20 D D4 21 26 D V1 VBIAS +Vs 20 D40 Inv_Fdbk VBIAS D D41 Pos_Fdbk VBIAS D D42 VBIAS Inv_Fdbk D D43 VBIAS Pos_Fdbk D * *** SUBTRACTOR STAGE *** E4 Inverting_Out 0 26 0 1 E5 noninverting_out 0 19 0 1 R1 31 sub_neg 120000.0 R2 -FIL 24 5994.022 RX2 -FIL sub_neg 6000 R3 +FIL 17 5993.605 RX3 +FIL sub_pos 6000 R4 REF sub_pos 120000.0 DX1 -FIL VPOSx D DX2 VNEGx -FIL D DX3 +FIL VPOSx D DX4 VNEGx +FIL D VCS3 sub_out 31 0 G8 0 sub_out sub_pos sub_neg 1E3 R9 sub_out 0 10E6 D13 REF 38 D D14 39 REF D V13 39 VNEGx 0.3 V14 VPOSx 38 0.3 D15 sub_pos 36 D D16 37 sub_pos D V15 37 VNEGx 2.05 V16 VPOSx 36 0.25 R22 sub_out_cl sub_out 100 D1 sub_out_cl 45 D D2 46 sub_out_cl D H4 VX sub_out_cl V25 456.32 * *** SLEW RATE AND OUTPUT STAGE *** G11 0 VZ VX VY 1e-3 R26 VZ 0 100E6 D21 40 VZ DSLEWP D22 40 0 DSLEWN G12 0 VY VZ 0 2.5E-3 C7 VY 0 1E-9 R30 VY 0 10e9 G9 0 41 VY 42 1 R12 41 0 1e10 C5 41 0 45.11E-9 G10 0 42 41 0 6.67E-3 R17 42 0 150.0 C6 42 0 300.7E-12 R27 43 42 0.1 D11 43 45 D D12 46 43 D H1 VPOSx 45 POLY(1) VSRC 1.05 0 2778 H2 46 VNEGx POLY(1) VSNK 1.66 0 2778 VOSO VOUT 43 125.3E-6 * *** NOISE *** V24 60 0 0 R19 60 0 .0166 D17 61 60 DN V18 61 0 0.2 V25 64 0 0 R20 64 0 .0166 D19 65 64 DN V20 65 0 0.137 V21 70 0 0 R28 70 0 .0166 D38 71 70 DIN V22 71 0 0.2 V23 72 0 0 R29 72 0 .0166 D39 73 72 DIN V27 73 0 0.2 * *** SUPPLY CURRENT AND BIASING *** GSUP +Vs -Vs POLY(1) (+Vs,-Vs) 4.574E-3 20.0E-6 FSUP1 56 0 VOSO -1 D24 90 +Vs DZ D25 -Vs 52 DZ D20 90 95 D VSRC 95 56 0 D23 55 52 D VSNK 56 55 0 FSUP2 57 0 VCS1 1 D26 90 57 D D27 57 52 D FSUP3 58 0 VCS2 1 D30 90 58 D D31 58 52 D FSUP4 59 0 VCS3 1 D34 90 59 D D35 59 52 D E10 VPOSx 0 +Vs 0 1 E11 VNEGx 0 -Vs 0 1 EMID VMID 0 POLY(2) (+Vs, 0) (-Vs, 0) 0 0.5 0.5 * * .MODEL D D(IS=1e-15 N=0.1 RS=1e-3) .MODEL DN D(IS=1e-15 KF=5.866E-6) .MODEL DIN D(IS=1e-15 KF=4.147E-5) .MODEL DZ D(IS=1e-15 BV=50 RS=1) .MODEL DSLEWP D(IS=1e-15 BV=19.5 RS=0.1) .MODEL DSLEWN D(IS=1e-15 BV=19.5 RS=0.1) * * .ENDS AD8428 *$