OP295/OP495

REV. B

–11–

8

1

4

2

3

58.7k

100k

C

R

V+

FREQ OUT

f

< 350Hz @ V+ = +5V

1

RC

100k

1/2

OP295/

OP495

Figure 13. Square Wave Oscillator Has Stable Frequency

Regardless of Supply Changes

V

IN

10k

V+

10k

100k

90.9k

20k

20k

V+

SPEAKER

2.2

µF

1/4

OP295/

OP495

1/4

OP295/

OP495

1/4

OP295/

OP495

Figure 14. Single Supply Differential Speaker Driver

High Accuracy, Single-Supply, Low Power Comparator

The OP295/OP495 makes an accurate open-loop comparator.

With a single +5 V supply, the offset error is less than 300

µV. Fig-

ure 15 shows the OP295/OP495’s response time when operating

open-loop with 4 mV overdrive. It exhibits a 4 ms response time at

the rising edge and a 1.5 ms response time at the falling edge.

10

100

0%

90

5ms

2V

1V

OUTPUT

(5mV OVERDRIVE

@ OP295 INPUT)

INPUT

Figure 15. Open-Loop Comparator Response Time with

5 mV Overdrive

OP295/OP495 SPICE MODEL Macro-Model

* Node Assignments

*

Noninverting Input

*

Inverting Input

*

Positive Supply

*

Negative Supply

*

Output

*

*

.SUBCKT OP295

1

2

99

50

20

*

* INPUT STAGE

*

I1

99

4

2E-6

R1

1

6

5E3

R2

2

5

5E3

CIN

1

2

2E-12

IOS

1

2

0.5E-9

D1

5

3

DZ

D2

6

3

DZ

EOS

7

6

POLY (1) (31,39) 30E-6 0.024

Q1

8

5

4

QP

Q2

9

74QP

R3

8

50

25.8E3

R4

9

50

25.8E3

*

* GAIN STAGE

*

R7

10

98

270E6

G1

98

10

POLY (1) (9,8) –4.26712E-9 27.8E-6

EREF 98

0

(39, 0) 1

R5

99

39

100E3

R6

39

50

100E3

*

* COMMON MODE STAGE

*

ECM

30

98

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

R12

30

31

1E6

R13

31

98

100

*

* OUTPUT STAGE

*

I2

18

50

1.59E-6

V2

99

12

DC 2.2763

Q4

10

14

50

QNA

1.0

R11

14

50

33

M3

15

10

13

13

MN L=9E-6 W=102E-6 AD=15E-10 AD=15E-10

M4

13

10

50

50

MN L=9E-6 W=50E-6 AD=75E-11 AS=75E-11

D8

10

22

DX

V3

22

50

DC 6

M2

20

10

14

14

MN L=9E-6 W=2000E-6 AD=30E-9 AS=30E-9

Q5

17

17

99

QPA

1.0

Q6

18

17

99

QPA

4.0

R8

18

99

2.2E6

Q7

18

19

99

QPA

1.0

R9

99

19

8

C2

18

99

20E-12

M6

15

12

17

99

MP L=9E-6 W=27E-6 AD=405E-12 AS=405E-12

M1

20

18

19

99

MP L=9E-6 W=2000E-6 AD=30E-9 AS=30E-9

D4

21

18

DX

V4

99

21

DC 6

R10

10

11

6E3

C3

11

20

50E-12

.MODEL QNA NPN (IS=1.19E-16 BF=253 NF=0.99 VAF=193 IKF=2.76E-3

+ ISE=2.57E-13 NE=5 BR=0.4 NR=0.988 VAR=15 IKR=1.465E-4

+ ISC=6.9E-16 NC=0.99 RB=2.0E3 IRB=7.73E-6 RBM=132.8 RE=4

RC=209

+ CJE=2.1E-13 VJE=0.573 MJE=0.364 FC=0.5 CJC=1.64E-13 VJC=0.534

MJC=0.5

+ CJS=1.37E-12 VJS=0.59 MJS=0.5 TF=0.43E-9 PTF=30)

.MODEL QPA PNP (IS=5.21E-17 BF=131 NF=0.99 VAF=62 IKF=8.35E-4

+ ISE=1.09E-14 NE=2.61 BR=0.5 NR=0.984 VAR=15 IKR=3.96E-5

+ ISC=7.58E-16 NC=0.985 RB=1.52E3 IRB=1.67E-5 RBM=368.5 RE=6.31

RC=354.4

+ CJE=1.1E-13 VJE=0.745 MJE=0.33 FC=0.5 CJC=2.37E-13 VJC=0.762

MJC=0.4

+ CJS =7.11E-13 VJS=0.45 MJS=0.412 TF=1.0E-9 PTF=30)

.MODEL MN NMOS (LEVEL=3 VTO=1.3 RS=0.3 RD=0.3

+ TOX=8.5E-8 LD=1.48E-6 NSUB=1.53E16 UO=650 DELTA=10 VMAX=2E5

+ XJ=1.75E-6 KAPPA=0.8 ETA=0.066 THETA=0.01 TPG=1 CJ=2.9E-4

PB=0.837

+ MJ=0.407 CJSW=0.5E-9 MJSW=0.33)

.MODEL MP PMOS (LEVEL=3 VTO=–1.1 RS=0.7 RD=0.7

+ TOX=9.5E-8 LD=1.4E-6 NSUB=2.4E15 UO=650 DELTA=5.6 VMAX=1E5

+ XJ=1.75E-6 KAPPA=1.7 ETA=0.71 THETA=5.9E-3 TPG=–1 CJ=1.55E-4

PB=0.56

+ MJ=0.442 CJSW=0.4E-9 MJSW=0.33)

.MODEL DX D(IS=1E-15)

.MODEL DZ D (IS=1E-15, BV=7)

.MODEL QP PNP (BF=125)

.ENDS