Modelling the AD734 in LTSpice

[Bill Sloman]

I'm trying to model a circut containing the AD734 in LTSpice.

Analog Devices offers a Spice model, and I've used LTSpice's automatic
symbol generation to produce a symbol, and renamed - but not
renumbered - the pins.

Version 4
SHEET 1 2708 1816
WIRE -1904 -304 -2080 -304
WIRE -912 -304 -1904 -304
WIRE -2080 -256 -2080 -304
WIRE -1072 -208 -1776 -208
WIRE -912 -208 -912 -304
WIRE -912 -208 -960 -208
WIRE -1072 -176 -1216 -176
WIRE -1776 -144 -1776 -208
WIRE -1216 -144 -1216 -176
WIRE -1072 -144 -1216 -144
WIRE -672 -144 -960 -144
WIRE -1216 -112 -1216 -144
WIRE -1072 -112 -1216 -112
WIRE -944 -112 -960 -112
WIRE -1216 -80 -1216 -112
WIRE -1072 -80 -1216 -80
WIRE -944 -80 -944 -112
WIRE -944 -80 -960 -80
WIRE -864 -80 -944 -80
WIRE -720 -80 -784 -80
WIRE -672 -80 -672 -144
WIRE -672 -80 -720 -80
WIRE -1472 -48 -1632 -48
WIRE -1072 -48 -1472 -48
WIRE -1072 -16 -1120 -16
WIRE -912 -16 -960 -16
WIRE -1632 64 -1632 -48
WIRE -1904 112 -1904 -304
WIRE -672 144 -672 -80
WIRE -2080 432 -2080 -176
WIRE -2000 432 -2080 432
WIRE -1952 432 -2000 432
WIRE -1904 432 -1904 176
WIRE -1904 432 -1952 432
WIRE -1776 432 -1776 -64
WIRE -1776 432 -1904 432
WIRE -1632 432 -1632 144
WIRE -1632 432 -1776 432
WIRE -1216 432 -1216 -80
WIRE -1216 432 -1632 432
WIRE -1120 432 -1120 -16
WIRE -1120 432 -1216 432
WIRE -672 432 -672 224
WIRE -672 432 -1120 432
WIRE -2000 464 -2000 432
WIRE -2080 544 -2080 432
WIRE -1952 592 -1952 432
WIRE -2080 736 -2080 624
WIRE -1952 736 -1952 656
WIRE -1952 736 -2080 736
WIRE -912 736 -912 -16
WIRE -912 736 -1952 736
FLAG -2000 464 0
FLAG -720 -80 Vout
FLAG -1472 -48 Vin
SYMBOL voltage -2080 -272 R0
WINDOW 123 0 0 Left 2
WINDOW 39 24 132 Left 2
SYMATTR SpiceLine Rser=0.001
SYMATTR InstName V1
SYMATTR Value 15
SYMBOL voltage -2080 528 R0
WINDOW 123 0 0 Left 2
WINDOW 39 -144 137 Left 2
WINDOW 0 -60 1 Left 2
WINDOW 3 -57 90 Left 2
SYMATTR SpiceLine Rser=0.001
SYMATTR InstName V2
SYMATTR Value 15
SYMBOL cap -1920 112 R0
SYMATTR InstName C2
SYMATTR Value 100n
SYMATTR SpiceLine Rser=0.1 Lser=1n
SYMBOL cap -1968 592 R0
WINDOW 0 -46 10 Left 2
SYMATTR InstName C10
SYMATTR Value 100n
SYMATTR SpiceLine Rser=0.1 Lser=1n
SYMBOL AutoGenerated\\AD734 -1024 -112 R0
SYMATTR InstName U2
SYMBOL res -768 -96 R90
WINDOW 0 0 56 VBottom 2
WINDOW 3 32 56 VTop 2
SYMATTR InstName R1
SYMATTR Value 250
SYMBOL voltage -1632 48 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V3
SYMATTR Value SINE(0 1 16k 0 0 0 10)
SYMBOL res -688 128 R0
SYMATTR InstName R2
SYMATTR Value 1250
SYMBOL voltage -1776 -160 R0
WINDOW 123 0 0 Left 2
WINDOW 39 0 0 Left 2
SYMATTR InstName V4
SYMATTR Value 1
TEXT -1632 504 Left 2 !.tran 0 1.4m 0
TEXT -1624 536 Left 2 !.options tseed=10n
TEXT -1624 568 Left 2 !.options method=gear\n.options trtol=7
TEXT -1632 632 Left 2 !.options cshunt=7e-15

This apparently came up last year - 04-04-2010 - and Helmut Sennewal
apparently sorted out JosephKK.

My test circuit runs for about 18 microsecond, then goes beserk, with
the output voltage falling below -100V and the +/-15V supply voltages
dropping abruptly at the same time.

The AD734.cir file from Analog Devices is dated 1992, and loooks
exactly the same as the one Josephkk posted.

Is there any way to get it to work?

--
Bill Sloman, Nijmegen