OP191/OP291/OP491

REV. 0

–18–

* OP491 SPICE Macro-model

Rev. A, 5/94

*

ARG/ADI

*

* Copyright 1994 by Analog Devices

*

* Refer to “README.DOC” file for License Statement. Use of

* this model indicates your acceptance of the terms and pro-

* visions in the License Statement.

*

* Node assignments

*

noninverting input

*

inverting input

*

positive supply

*

negative supply

*

output

*

.SUBCKT OP491

1

2

99

50 45

*

* INPUT STAGE

*

I1

99

7

8.06E-6

Q1

647

QP

Q2

537

QP

D1

3

99

DX

D2

4

99

DX

D3

34DX

D4

43DX

R1

3

8

5E3

R2

4

2

5E3

R3

5

50

6.4654E3

R4

6

50

6.4654E3

EOS 8

1

POLY(1) (16,39)

–0.08E-3

1

IOS

3

4

50E-12

GB1 3

98

(21,98) 50E-9

GB2 4

98

(21,98) 50E-9

CIN 1

2

1E-12

*

* 1ST GAIN STAGE

*

EREF 98

0

(39,0)

1

G1

98

9

(6,5)

31.667E-6

R7

9

98

1E6

EC1 99

10

POLY(1) (99,39)

–0.52

1

EC2 11

50

POLY(1) (39,50)

–0.52

1

D5

9

10

DX

D6

11

9

DX

*

* 2ND GAIN STAGE AND DOMINANT POLE AT 1.25 Hz

*

G2

98

12

(9,39)

8E-6

R8

12

98

276.311E6

C2

12

98

16E-12

D7

12

13

DX

D8

14

12

DX

V1

99

13

0.58

V2

14

50

0.58

*

* COMMON-MODE STAGE

*

ECM 15

98

POLY(2) (1,39) (2,39) 0 0.5 0.5

R9

15

16

1E6

R10

16

98

10

*

* POLE AT 2.5 MHz

*

G3

98

18

(12,39) 1E-6

R11

18

98

1E6

C4

18

98

63.662E-15

*

* BIAS CURRENT-VS-COMMON-MODE VOLTAGE

*

EP

97

0

(99,0) 1

VB

99

17

1.3

RB

17

50

1E9

E3

19

0

(15,17) 16

D13 19

20

DX

R12

20

0

1E6

G4

98

21

(20,0) 1E-3

R13

21

98

5E3

D14 21

22

DY

E4

97

22

(POLY(1) (99,98) -0.765 1

*

* POLE AT 100 MHz

*

G6

98

40

(18,39) 1E-6

R20

40

98

1E6

C10

40

98

1.592E-15

*

* OUTPUT STAGE

*

RS1

99

39

109.375E3

RS2

39

50

109.375E3

RO1 99

45

41.667

RO2 45

50

41.667

G7

45

99

(99,40) 24E-3

G8

50

45

(40,50) 24E-3

G9

98

60

(45,40) 24E-3

D9

60

61

DX

D10 62

60

DX

V7

61

98

DC 0

V8

98

62

DC 0

FSY 99

50

POLY(2) V7 V8 0.207E-3 1 1

D11 41

45

DZ

D12 45

42

DZ

V5

40

41

0.131

V6

42

40

0.131

.MODEL DX D()

.MODEL DY D(IS=1E-9)

.MODEL DZ D(IS=1E-6)

.MODEL QP PNP(BF=66.667)

.ENDS