OP295/OP495
V+
R2
2
1
1
5
6
7
8
9
8
9
5
2
2
3
3
6
5E3
CIN
IOS
D1
D2
EOS
Q1
Q2
R3
2E-12
0.5E-9
DZ
100k
58.7k
DZ
POLY (1) (31,39) 30E-6 0.024
4
4
8
4
3
2
5
7
QP
QP
1/2
1
FREQ OUT
1
OP295/
OP495
50 25.8E3
50 25.8E3
fOSC
=
< 350Hz @ V+ = +5V
RC
100k
R4
*
* GAIN ST AGE
*
R
C
R7
G1
EREF 98
R5
R6
*
10 98 270E6
98 10 POLY (1) (9,8) –4.26712E-9 27.8E-6
(39, 0) 1
99 39 100E3
39 50 100E3
Figure 13. Square Wave Oscillator Has Stable Frequency
Regardless of Supply Changes
0
90.9k
* COMMON MODE ST AGE
*
10k
V+
ECM 30 98 POLY(2) (1,39) (2,39) 0 0.5 0.5
2.2µF
R12
R13
*
30 31 1E6
31 98 100
1/4
V
IN
OP295/
OP495
10k
100k
SPEAKER
* OUT PUT ST AGE
*
I2
V2
18 50 1.59E-6
99 12 DC 2.2763
10 14 50 QNA 1.0
14 50 33
15 10 13 13 MN L=9E-6 W=102E-6 AD=15E-10 AD=15E-10
13 10 50 50 MN L=9E-6 W=50E-6 AD=75E-11 AS=75E-11
10 22 DX
1/4
1/4
OP295/
OP495
OP295/
OP495
Q4
R11
M3
M4
D8
V3
M2
Q5
Q6
R8
20k
20k
V+
22 50 DC
6
Figure 14. Single Supply Differential Speaker Driver
20 10 14 14 MN L=9E-6 W=2000E-6 AD=30E-9 AS=30E-9
17 17 99 QPA 1.0
18 17 99 QPA 4.0
18 99 2.2E6
18 19 99 QPA 1.0
H igh Accur acy, Single-Supply, Low P ower Com par ator
T he 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.
Q7
R9
99 19
8
C2
M6
M1
D4
V4
18 99 20E-12
15 12 17 99 MP L=9E-6 W=27E-6 AD=405E-12 AS=405E-12
20 18 19 99 MP L=9E-6 W=2000E-6 AD=30E-9 AS=30E-9
21 18 DX
99 21 DC
10 11 6E3
6
1V
R10
C3
100
90
11 20 50E-12
INPUT
.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
(5mV OVERDRIVE
@ OP295 INPUT)
+ CJE=2.1E-13 VJE=0.573 MJE=0.364 FC=0.5 CJC=1.64E-13 VJC=0.534
MJC=0.5
OUTPUT
+ CJS=1.37E-12 VJS=0.59 MJS=0.5 T F=0.43E-9 PT F=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
10
0%
2V
5ms
+ CJE=1.1E-13 VJE=0.745 MJE=0.33 FC=0.5 CJC=2.37E-13 VJC=0.762
MJC=0.4
Figure 15. Open-Loop Com parator Response Tim e with
5 m V Overdrive
+ CJS =7.11E-13 VJS=0.45 MJS=0.412 T F=1.0E-9 PT F=30)
.MODEL MN NMOS (LEVEL=3 VT O=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 ET A=0.066 T HET A=0.01 T PG=1 CJ=2.9E-4
PB=0.837
O P 295/O P 495 SP ICE MO D EL Macr o-Model
* Node Assignments
*
*
Noninverting Input
Inverting Input
+ MJ=0.407 CJSW=0.5E-9 MJSW=0.33)
*
*
Positive Supply
Negative Supply
.MODEL MP PMOS (LEVEL=3 VT O=–1.1 RS=0.7 RD=0.7
+ T OX=9.5E-8 LD=1.4E-6 NSUB=2.4E15 UO=650 DELT A=5.6 VMAX=1E5
+ XJ=1.75E-6 KAPPA=1.7 ET A=0.71 T HET A=5.9E-3 T PG=–1 CJ=1.55E-4
PB=0.56
+ MJ=0.442 CJSW=0.4E-9 MJSW=0.33)
.MODEL DX D(IS=1E-15)
*
Output
*
*
.SUBCKT OP295
1
2
99
50
20
*
.MODEL DZ D (IS=1E-15, BV=7)
.MODEL QP PNP (BF=125)
* INPUT ST AGE
*
.ENDS
I1
R1
99
1
4
6
2E-6
5E3
REV. B
–11–
ADI [ ADI ]
