OP27A, OP27C, OP27E, OP27G
OP37A, OP37C, OP37E, OP37G
LOW-NOISE HIGH-SPEED PRECISION OPERATIONAL AMPLIFIERS
SLOS100B – FEBRUARY 1989 – REVISED AUGUST 1994
Copyright 1994, Texas Instruments Incorporated
2–1
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
POST OFFICE BOX 1443
• HOUSTON, TEXAS 77251–1443
• Direct Replacements for PMI and LTC OP27
and OP37 Series
Features of OP27A, OP27C, OP37A, and
OP37C:
• Maximum Equivalent Input Noise Voltage:
3.8 nV/√Hz
at 1 kHz
5.5 nV/√Hz
at 10 kHz
• Very Low Peak-to-Peak Noise Voltage at
0.1 Hz to 10 Hz . . . 80 nV Typ
• Low Input Offset Voltage ...25 µV Max
• High Voltage Amplification ...1 V/µV Min
Feature of OP37 Series:
• Minimum Slew Rate ...11 V/µs
description
The OP27 and OP37 operational amplifiers
combine outstanding noise performance with
excellent precision and high-speed specifications.
The wideband noise is only 3 nV/√Hz
and with the
1/f noise corner at 2.7 Hz, low noise is maintained
for all low-frequency applications.
The outstanding characteristics of the OP27 and
OP37 make these devices excellent choices
for low-noise amplifier applications requiring
precision performance and reliability . Additionally ,
the OP37 is free of latch-up in high-gain,
large-capacitive-feedback configurations.
The OP27 series is compensated for unity gain.
The OP37 series is decompensated for increased
bandwidth and slew rate and is stable down to a
gain of 5.
The OP27A, OP27C, OP37A, and OP37C are
characterized for operation over the full military
temperature range of –55°C to 125°C. The
OP27E, OP27G, OP37E, and OP37G are
characterized for operation from – 25°C to 85°C.
AVAILABLE OPTIONS
PACKAGE
T
A
VIOmax
AT 25°C
STABLE
GAIN
CERAMIC DIP
(JG)
CHIP CARRIER
(FK)
PLASTIC DIP
(P)
1 — — OP27EP
°
°
25 µV
5 — — OP37EP
–
25°C to 85°C
1 — — OP27GP
100 µV
5 — — OP37GP
1 OP27AJG OP27AFK —
°
°
25 µV
5 OP37AJG OP37AFK —
–
55°C to 125°C
1 OP27CJG — —
100 µV
5 OP37CJG — —
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
1
2
3
4
8
7
6
5
VIO TRIM
IN–
IN +
V
CC –
VIO TRIM
V
CC+
OUT
NC
JG OR P PACKAGE
(TOP VIEW)
IN+
IN –
OUT
VIO TRIM
18
6
3
2
symbol
3 2 1 20 19
910111213
4
5
6
7
8
18
17
16
15
14
NC
V
CC+
NC
OUT
NC
NC
1N–
NC
IN+
NC
FK PACKAGE
(TOP VIEW)
NC
NCNCNC
NC
NC
NC – No internal connection
CC –
V
Pin numbers are for the JG and P packages.
IO
V TRIM
NC
IO
V TRIM
+
–
OP27A, OP27C, OP27E, OP27G
OP37A, OP37C, OP37E, OP37G
LOW-NOISE HIGH-SPEED OPERATIONAL AMPLIFIER
SLOS100B – FEBRUARY 1989 – REVISED AUGUST 1994
2–2
POST OFFICE BOX 655303 DALLAS, TEXAS 75265POST OFFICE BOX 1443 HOUSTON, TEXAS 77251–1443
••
schematic
IN +
IN –
Q3
Q1A
Q1B Q2B Q2A
Q11
Q12
Q27 Q28
Q26
Q46
Q19
Q20
Q45
Q22
Q24Q23
Q21
Q6
VIO TRIM VIO TRIM
VCC
+
OUT
VCC
–
480 µA
750
µA
260
µA
240 µA 120
µA
340
µA
C1
†
†
C1 = 120 pF for OP27
C1 = 15 pF for OP37
OP27A, OP27C, OP27E, OP27G
OP37A, OP37C, OP37E, OP37G
LOW-NOISE HIGH-SPEED PRECISION OPERATIONAL AMPLIFIERS
SLOS100B – FEBRUARY 1989 – REVISED AUGUST 1994
2–3
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
POST OFFICE BOX 1443
• HOUSTON, TEXAS 77251–1443
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
Supply voltage, V
CC+
(see Note 1) 22 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Supply voltage, V
CC–
(see Note 1) – 22 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input voltage, V
I
V
CC±
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Duration of output short circuit unlimited. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Differential input current (see Note 2) ±25 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Continuous power dissipation See Dissipation Rating Table. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating free-air temperature range: OP27A, OP27C, OP37A, OP37C – 55°C to 125°C. . . . . . . . . . . . . . .
OP27E, OP27G, OP37E, OP37G – 25°C to 85°C. . . . . . . . . . . . . . .
Storage temperature range – 65°C to 150°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Lead temperature 1,6 mm (1/16 inch) from case for 60 seconds: JG or FK package 300°C. . . . . . . . . . . . . .
Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds : P package 260°C. . . . . . . . . . . . . . . . . . . .
NOTES: 1. All voltage values are with respect to the midpoint between V
CC+
and V
CC–
unless otherwise noted.
2. The inputs are protected by back-to-back diodes. Current-limiting resistors are not used in order to achieve low noise. Excessive
input current will flow if a differential input voltage in excess of approximately ± 0.7 V is applied between the inputs unless some
limiting resistance is used.
DISSIPATION RATING TABLE
PACKAGE
TA ≤ 25°C
POWER RATING
DERATING FACTOR
ABOVE TA = 25°C
TA = 85°C
POWER RATING
TA = 125°C
POWER RATING
JG
FK
P
1050 mW
1375 mW
1000 mW
8.4 mW/°C
11.0 mW/°C
8.0 mW/°C
546 mW
715 mW
520 mW
210 mW
275 mW
N/A
OP27A, OP27C, OP27E, OP27G
OP37A, OP37C, OP37E, OP37G
LOW-NOISE HIGH-SPEED PRECISION OPERATIONAL AMPLIFIERS
SLOS100B – FEBRUARY 1989 – REVISED AUGUST 1994
2–4
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
POST OFFICE BOX 1443
• HOUSTON, TEXAS 77251–1443
recommended operating conditions
OP27A, OP37A OP27C, OP37C
MIN NOM MAX MIN NOM MAX
UNIT
Supply voltage, V
CC+
4 15 22 4 15 22 V
Supply voltage, V
CC–
–4 –15 –22 –4 –15 –22 V
p
V
CC±
= ± 15 V, TA = 25°C ± 11 ±11
Common-mode input voltage, V
IC
V
CC±
= ± 15 V, TA = – 55°C to 125°C ±10.3 ±10.2
V
Operating free-air temperature, T
A
–55 125 –55 125 °C
electrical characteristics at specified free-air temperature, V
CC±
= ±15 V (unless otherwise noted)
OP27A, OP37A OP27C, OP37C
PARAMETER
TEST CONDITIONS
T
A
†
MIN TYP MAX MIN TYP MAX
UNIT
p
V
= 0, V
= 0
25°C 10 25 30 100
VIOInput offset voltage
O
,
IC
RS = 50 Ω, See Note 3
Full range 60 300
µ
V
α
VIO
Average temperature
coefficient of input
offset voltage
Full range 0.2 0.6 0.4 1.8 µV/°C
Long-term drift of input
offset voltage
See Note 4 0.2 1 0.4 2 µV/mo
p
25°C 7 35 12 75
IIOInput offset current
V
O
= 0,
V
IC
=
0
Full range 50 135
nA
p
25°C ±10 ±40 ±15 ±80
IIBInput bias current
V
O
= 0,
V
IC
=
0
Full range ±60 ±150
nA
Common-mode input
25°C
11
to
–11
11
to
–11
V
ICR
voltage range
Full range
10.3
to
–10.3
10.5
to
–10.5
V
RL ≥ 2 kΩ ±12 ±13.8 ±11.5 ±13.5
V
OM
Peak output voltage swing
RL ≥ 0.6 kΩ
±10 ±11.5 ±10 ±11.5
V
RL ≥ 2 kΩ Full range ±11.5 10.5
RL ≥ 2 kΩ, VO = ±10 V 1000 1800 700 1500
RL ≥ 1 kΩ, VO = ±10 V 800 1500 1500
A
VD
Large-signal differential
voltage amplification
RL ≥ 0.6 kΩ, VO = ±1 V,
V
CC±
= ± 4 V
250 700 200 500
V/mV
RL ≥ 2 kΩ, VO = ±10 V Full range 600 300
r
i(CM)
Common-mode input
resistance
3 2 GΩ
r
o
Output resistance VO = 0, IO = 0 25°C 70 70 Ω
Common-mode rejection
VIC = ±11 V 25°C 114 126 100 120
CMRR
j
ratio
VIC = ±10 V
Full range 110 94
dB
Supply voltage rejection
V
CC±
= ±4 V to ±18 V 25°C 100 120 94 118
k
SVR
ygj
ratio
V
CC±
= ±4.5 V to ±18 V Full range 96 86
dB
†
Full range is – 55°C to 125°C.
NOTES: 3. Input offset voltage measurements are performed by automatic test equipment approximately 0.5 seconds after applying power.
4. Long-term drift of input offset voltage refers to the average trend line of offset voltage versus time over extended periods after the
first 30 days of operation. Excluding the initial hour of operation, changes in VIO during the first 30 days are typically 2.5 µV
(see Figure 3).
OP27A, OP27C, OP27E, OP27G
OP37A, OP37C, OP37E, OP37G
LOW-NOISE HIGH-SPEED PRECISION OPERATIONAL AMPLIFIERS
SLOS100B – FEBRUARY 1989 – REVISED AUGUST 1994
2–5
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
POST OFFICE BOX 1443
• HOUSTON, TEXAS 77251–1443
recommended operating conditions
MIN NOM MAX UNIT
Supply voltage, V
CC+
4 15 22 V
Supply voltage, V
CC –
–4 –15 –22 V
p
V
CC±
= ±15 V, TA = 25°C ±11
Common-mode input voltage, V
IC
V
CC±
= ±15 V, TA = – 55°C to 125°C ±10.5
V
Operating free-air temperature, T
A
–25 85 °C
electrical characteristics at specified free-air temperature, V
CC
±
= ±15 V (unless otherwise noted)
OP27E, OP37E OP27G, OP37G
PARAMETER
TEST CONDITIONS
T
A
†
MIN TYP MAX MIN TYP MAX
UNIT
p
V
= 0, V
= 0
25°C 10 25 30 100
VIOInput offset voltage
O
,
IC
RS = 50 Ω, See Note 3
Full range 60 220
µ
V
αV
IO
Average temperature
coefficient of input
offset voltage
Full range 0.2 0.6 0.4 1.8 µV/°C
Long-term drift of input
offset voltage
See Note 4 0.2 1 0.4 2 µV/mo
p
25°C 7 35 12 75
IIOInput offset current
V
O
= 0,
V
IC
=
0
Full range 50 135
nA
p
25°C ±10 ±40 ±15 ±80
IIBInput bias current
V
O
=
0
,
V
IC
=
0
Full range ±60 ±150
nA
Common-mode input
25°C
11
to
–11
11
to
–11
V
ICR
voltage range
Full range
10.3
to
–10.3
10.5
to
–10.5
V
RL ≥ 2 kΩ ±12 ±13.8 ±11.5 ±13.5
V
OM
Peak output voltage swing
RL ≥ 0.6 kΩ
±10 ±11.5 ±10 ±11.5
V
RL ≥ 2 kΩ Full range ±1 1.5 10.5
RL ≥ 2 kΩ, VO = ±10 V 1000 1800 700 1500
RL ≥ 1 kΩ, VO = ±10 V 800 1500 1500
A
VD
Large-signal differential
voltage amplification
RL ≥ 0.6 kΩ, VO = ±1 V,
V
CC±
= ± 4 V
250 700 200 500
V/mV
RL ≥ 2 kΩ, VO = ± 10 V Full range 600 450
r
i(CM)
Common-mode input
resistance
3 2 GΩ
r
o
Output resistance VO = 0, IO = 0 25°C 70 70 Ω
Common-mode rejection
VIC = ±11 V 25°C 114 126 100 120
CMRR
j
ratio
VIC = ±10 V
Full range 110 96
dB
Supply voltage rejection
V
CC±
= ± 4 V to ±18 V 25°C 100 120 94 118
k
SVR
ygj
ratio
V
CC±
= ± 4.5 V to ±18 V Full range 96 90
dB
†
Full range is – 25°C to 85°C.
NOTES: 3. Input offset voltage measurements are performed by automatic test equipment approximately 0.5 seconds after applying power.
4. Long-term drift of input offset voltage refers to the average trend line of offset voltage versus time over extended periods after the
first 30 days of operation. Excluding the initial hour of operation, changes in VIO during the first 30 days are typically 2.5 µV
(see Figure 3).
OP27A, OP27C, OP27E, OP27G
OP37A, OP37C, OP37E, OP37G
LOW-NOISE HIGH-SPEED PRECISION OPERATIONAL AMPLIFIERS
SLOS100B – FEBRUARY 1989 – REVISED AUGUST 1994
2–6
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
POST OFFICE BOX 1443
• HOUSTON, TEXAS 77251–1443
OP27 operating characteristics over operating free-air temperature range, V
CC±
= ±15 V
OP27A, OP27E OP27C, OP27G
PARAMETER
TEST CONDITIONS
MIN TYP MAX MIN TYP MAX
UNIT
SR Slew rate AVD ≥ 1, RL ≥ 2 kΩ 1.7 2.8 1.7 2.8 V/µs
V
N(PP)
Peak-to-peak equivalent
input noise voltage
f = 0.1 Hz to 10 Hz, RS = 20 Ω,
See Figure 34
0.08 0.18 0.09 0.25 µV
f = 10 Hz, RS = 20 Ω 3.5 5.5 3.8 8
V
n
Equivalent input noise voltage
f = 30 Hz, RS = 20 Ω
3.1 4.5 3.3 5.6
nV/√Hz
f = 1 kHz, RS = 20 Ω 3 3.8 3.2 4.5
f = 10 Hz, See Figure 35 1.5 4 1.5
I
n
Equivalent input noise current
f = 30 Hz, See Figure 35
1 2.3 1
pA/√Hz
f = 1 kHz, See Figure 35 0.4 0.6 0.4 0.6
Gain-bandwidth product f = 100 kHz 5 8 5 8 MHz
OP37 operating characteristics over operating free-air temperature range, V
CC±
= ±15 V
OP37A, OP37E OP37C, OP37G
PARAMETER
TEST CONDITIONS
MIN TYP MAX MIN TYP MAX
UNIT
SR Slew rate AVD ≥ 5, RL ≥ 2 kΩ 11 17 11 17 V/µs
V
N(PP)
Peak-to-peak equivalent
input noise voltage
f = 0.1 Hz to 10 Hz, RS = 20 Ω,
See Figure 34
0.08 0.18 0.09 0.25 µV
f = 10 Hz, RS = 20 Ω 3.5 5.5 3.8 8
V
n
Equivalent input noise
f = 30 Hz, RS = 20 Ω 3.1 4.5 3.3 5.6
nV/√Hz
voltage
f = 1 kHz, RS = 20 Ω 3 3.8 3.2 4.5
f = 10 Hz, See Figure 35 1.5 4 1.5
I
n
Equivalent input noise current
f = 30 Hz, See Figure 35
1 2.3 1
pA/√Hz
f = 1 kHz, See Figure 35 0.4 0.6 0.4 0.6
p
f = 10 kHz 45 63 45 63
Gain-bandwidth product
AV ≥ 5, f = 1 MHz 40 40
MH
z
OP27A, OP27C, OP27E, OP27G
OP37A, OP37C, OP37E, OP37G
LOW-NOISE HIGH-SPEED PRECISION OPERATIONAL AMPLIFIERS
SLOS100B – FEBRUARY 1989 – REVISED AUGUST 1994
2–7
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
POST OFFICE BOX 1443
• HOUSTON, TEXAS 77251–1443
TYPICAL CHARACTERISTICS
Table of Graphs
FIGURE
V
IO
Input offset voltage vs Temperature 1
∆V
IO
Change in input offset voltage
vs Time after power on
vs Time (long-term drift)
2
3
I
IO
Input offset current vs Temperature 4
I
IB
Input bias current vs Temperature 5
V
ICR
Common-mode input voltage range vs Supply voltage 6
V
OM
Maximum peak output voltage vs Load resistance 7
V
O(PP)
Maximum peak-to-peak output voltage vs Frequency 8, 9
A
VD
Differential voltage amplification
vs Supply voltage
vs Load resistance
vs Frequency
10
11
12, 13, 14
CMRR Common-mode rejection ratio vs Frequency 15
k
SVR
Supply voltage rejection ratio vs Frequency 16
SR Slew rate
vs Temperature
vs Supply voltage
vs Load resistance
17
18
19
φ
m
Phase margin vs Temperature 20, 21
φ Phase shift vs Frequency 12, 13
V
n
Equivalent input noise voltage
vs Bandwidth
vs Source resistance
vs Supply voltage
vs Temperature
vs Frequency
22
23
24
25
26
I
n
Equivalent input noise current vs Frequency 27
Gain-bandwidth product vs Temperature 20, 21
I
OS
Short-circuit output current vs Time 28
I
CC
Supply current vs Supply voltage 29
Pulse response
Small signal
Large signal
30, 32
31, 33
OP27A, OP27C, OP27E, OP27G
OP37A, OP37C, OP37E, OP37G
LOW-NOISE HIGH-SPEED PRECISION OPERATIONAL AMPLIFIERS
SLOS100B – FEBRUARY 1989 – REVISED AUGUST 1994
2–8
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
POST OFFICE BOX 1443
• HOUSTON, TEXAS 77251–1443
TYPICAL CHARACTERISTICS
†
100
80
60
40
20
0
– 20
– 40
– 60
– 80
– 100
– 50 – 25 0 25 50 75 100 125
– Input Offset Voltage – V
TA – Free-Air T emperature – °C
INPUT OFFSET VOLTAGE OF
REPRESENTATIVE INDIVIDUAL UNITS
vs
FREE-AIR TEMPERATURE
V
CC±
= ±15 V
10
5
0
WARM-UP CHANGE IN
INPUT OFFSET VOLTAGE
vs
ELAPSED TIME
12345
Time After Power On – minutes
IO
µV
∆V
IO
– Change in Input Offset Voltage – Vµ
V
CC±
= ±15 V
TA = 25°C
OP27CP/GP
OP37CP/GP
OP27C/37C
OP27A/37A
OP27A/37A
OP27E/37E
OP27C/37C
OP27G/37G
OP27AP/EP
OP37AP/EP
Figure 1 Figure 2
LONG-TERM DRIFT OF INPUT OFFSET VOLTAGE OF
REPRESENTATIVE INDIVIDUAL UNITS
6
2
4
0
– 2
– 4
– 6
012345678
Time – months
0.2-µV/mo Trend Line
0.2-µV/mo Trend Line
∆V
IO
– Change in Input Offset Voltage – Vµ
Figure 3
†
Data for temperatures below – 25°C and above 85°C are applicable to the OP27A, OP27C, OP37A, and OP37C only.
OP27A, OP27C, OP27E, OP27G
OP37A, OP37C, OP37E, OP37G
LOW-NOISE HIGH-SPEED PRECISION OPERATIONAL AMPLIFIERS
SLOS100B – FEBRUARY 1989 – REVISED AUGUST 1994
2–9
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
POST OFFICE BOX 1443
• HOUSTON, TEXAS 77251–1443
TYPICAL CHARACTERISTICS
†
INPUT OFFSET CURRENT
vs
FREE-AIR TEMPERATURE
– Input Offset Current – nA
TA – Free-Air Temperature – °C
50
40
30
20
10
0
– 75 – 50 – 25 0 50 75 100 12525
V
CC±
= ±15 V
OP27C/G
OP37C/G
OP27A/E
OP37A/E
INPUT BIAS CURRENT
vs
FREE-AIR TEMPERATURE
TA – Free-Air Temperature – °C
± 50
± 40
± 30
± 20
± 10
0
– 50 – 25 0 50 75 100 12525
I
IO
– Input Bias Current – nA
I
IB
– 75
OP27C/G
OP37C/G
OP27A/E
OP37A/E
V
CC±
= ±15 V
Figure 4 Figure 5
20
COMMON-MODE INPUT VOLTAGE RANGE LIMITS
vs
SUPPLY VOLTAGE
0 ±5 ±10 ±15 ±20
V
CC+
– Supply Voltage – V
VICR – Common-Mode Input Voltage Range Limits – V
TA = –55°C
TA = 125°C
TA = – 55°C
TA = 125°C
TA = 25°C
TA = 25°C
– Maximum Peak Output Voltage – VV
OM
MAXIMUM PEAK OUTPUT VOLTAGE
vs
LOAD RESISTANCE
18
16
14
12
10
8
6
4
2
0
0.1 1 10
RL – Load Resistance – kΩ
16
12
8
4
0
– 4
– 8
– 12
– 16
VCC ± = ± 15 V
TA = 25°C
Positive
Swing
Negative
Swing
V
ICR
Figure 6 Figure 7
†
Data for temperatures below – 25°C and above 85°C are applicable to the OP27A, OP27C, OP37A, and OP37C only.
OP27A, OP27C, OP27E, OP27G
OP37A, OP37C, OP37E, OP37G
LOW-NOISE HIGH-SPEED PRECISION OPERATIONAL AMPLIFIERS
SLOS100B – FEBRUARY 1989 – REVISED AUGUST 1994
2–10
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
POST OFFICE BOX 1443
• HOUSTON, TEXAS 77251–1443
TYPICAL CHARACTERISTICS
1 k
V
OP27
MAXIMUM PEAK-TO-PEAK
OUTPUT VOLTAGE
vs
FREQUENCY
OPP
– Maximum Peak-to-Peak Output Voltage – V
28
24
20
16
12
8
4
10 k 100 k 1 M 10 M
f – Frequency – Hz
0
10 k
OP37
MAXIMUM PEAK-TO-PEAK
OUTPUT VOLTAGE
vs
FREQUENCY
28
24
20
16
12
8
4
100 k 1 M 10 M
f – Frequency – Hz
0
V
O(PP)
V
OPP
– Maximum Peak-to-Peak Output Voltage – V
V
O(PP)
VCC ± = ± 15 V
RL = 1 kΩ
TA = 25°C
VCC ± = ± 15 V
RL = 1 kΩ
TA = 25°C
Figure 8 Figure 9
24002500
10
OP27A, OP27E, OP37A, OP37E
LARGE-SIGNAL
DIFFERENTIAL VOLTAGE AMPLIFICATION
vs
TOTAL SUPPLY VOLTAGE
A
OP27A, OP27E, OP37A, OP37E
LARGE-SIGNAL
DIFFERENTIAL VOLTAGE AMPLIFICATION
vs
LOAD RESISTANCE
VD
– Differential Voltage Amplification – V/mV
A
VD
– Differential Voltage Amplification – V/mV
0.1
110
100
RL – Load Resistance – kΩV
CC+
– VCC – – Total Supply Voltage – V
0 20304050
2000
1500
1000
500
0
2200
2000
1800
1600
1400
1200
1000
800
600
400
VO = ± 10 V
TA = 25°C
RL = 1 kΩ
VCC ± = ± 15 V
VO = ± 10 V
TA = 25°C
RL = 2 kΩ
Figure 10 Figure 11
OP27A, OP27C, OP27E, OP27G
OP37A, OP37C, OP37E, OP37G
LOW-NOISE HIGH-SPEED PRECISION OPERATIONAL AMPLIFIERS
SLOS100B – FEBRUARY 1989 – REVISED AUGUST 1994
2–11
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
POST OFFICE BOX 1443
• HOUSTON, TEXAS 77251–1443
TYPICAL CHARACTERISTICS
1
OP27
LARGE-SIGNAL DIFFERENTIAL
VOLTAGE AMPLIFICATION AND PHASE SHIFT
vs
FREQUENCY
25
20
15
10
5
0
– 5
10 100
f – Frequency – Hz
– 10
0.1
OP37
LARGE-SIGNAL DIFFERENTIAL
VOLTAGE AMPLIFICATION AND PHASE SHIFT
vs
FREQUENCY
60
50
40
30
20
10
0
1 100
f – Frequency – MHz
– 10
V
CC±
=±15 V
RL = 1 kΩ
TA = 25°C
– Differential Voltage Amplification – dBA
VD
80°
100°
120°
140°
160°
180°
200°
220°
– Phase Shift
10
80°
100°
120°
140°
160°
180°
200°
220°
Phase Shift
A
VD
Phase Shift
A
VD
φ
– Phase Shift
φ
– Differential Voltage Amplification – dBA
VD
φm = 70°
φm = 71°
V
CC±
= ±15 V
RL = 1 kΩ
TA = 25°C
Figure 12 Figure 13
OP27A, OP27E, OP37A, OP37E
LARGE-SIGNAL
DIFFERENTIAL VOLTAGE AMPLIFICATION
vs
FREQUENCY
f – Frequency – Hz
V
CC±
= ±15 V
RL = 2 kΩ
TA = 25°C
CMRR – Common-Mode Rejection Ratio – dB
1 k
OP27A, OP27E, OP37A, OP37E
COMMON-MODE REJECTION RATIO
vs
FREQUENCY
140
10 k 100 k 1 M 10 M
f – Frenquency – Hz
40
V
CC±
= ±15 V
VIC = ± 10 V
TA = 25°C
120
100
80
60
140
120
100
80
60
40
20
0
–20
0.1 1 10 100 1 k 10 k 1 M 100 M
– Differential Voltage Amplification – dBA
VD
OP37A/E
OP27A/E
OP27A/E
OP37A/E
Figure 14 Figure 15
OP27A, OP27C, OP27E, OP27G
OP37A, OP37C, OP37E, OP37G
LOW-NOISE HIGH-SPEED PRECISION OPERATIONAL AMPLIFIERS
SLOS100B – FEBRUARY 1989 – REVISED AUGUST 1994
2–12
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POST OFFICE BOX 1443
• HOUSTON, TEXAS 77251–1443
TYPICAL CHARACTERISTICS
†
SUPPLY VOLTAGE REJECTION RATIO
vs
FREQUENCY
f – Frequency – Hz
– Supply Voltage Rejection Ratio – dBk
V
CC±
= ±4 V to ±18 V
TA = 25°C
SLEW RATE
vs
FREE-AIR TEMPERATURE
TA – Free Air Temperature – ° C
V
CC±
= ±15 V
RL ≥ 2 kΩ
OP37
(AVD ≥ 5)
SVR
160
140
120
100
80
60
40
20
0
20
18
16
14
12
10
8
6
4
2
0
1 10 100 1 k 10 k 100 k 1 M 10 M 100 M – 50 – 25 0 25 50 75 100 125
SR – Slew Rate – V/µs
OP27
(AVD ≥ 1)
Positive
Supply
Negative
Supply
Figure 16 Figure 17
OP37
SLEW RATE
vs
SUPPLY VOLTAGE
V
CC±
– Supply Voltage – V
AVD = 5
RL = 2 kΩ
TA = 25°C
SR – Slew Rate – V/
Rise
0.1
OP37
SLEW RATE
vs
LOAD RESISTANCE
19
1 100
f – Frequency – Hz
10
µs
SR – Slew Rate – V/µs
20
15
10
5
0
18
17
16
15
± 3 ± 6 ± 9 ± 12 ± 15 ± 18 ± 21
Fall
V
CC±
= ±15 V
AVD = 5
V
O(PP)
= 20 V
TA = 25°C
Figure 18 Figure 19
†
Data for temperatures below – 25°C and above 85°C are applicable to the OP27A, OP27C, OP37A, and OP37C only.
OP27A, OP27C, OP27E, OP27G
OP37A, OP37C, OP37E, OP37G
LOW-NOISE HIGH-SPEED PRECISION OPERATIONAL AMPLIFIERS
SLOS100B – FEBRUARY 1989 – REVISED AUGUST 1994
2–13
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
POST OFFICE BOX 1443
• HOUSTON, TEXAS 77251–1443
TYPICAL CHARACTERISTICS
†
OP27
PHASE MARGIN AND
GAIN-BANDWIDTH PRODUCT
vs
FREE-AIR TEMPERATURE
Gain-Bandwidth Product – MHz
TA – Free-Air Temperature – °C
– 75 – 50 – 25 0 50 75 100 12525
V
CC±
= ±15 V
GBW (f = 100 kHz)
75°
65°
55°
45°
35°
8.6
8.2
7.8
7.4
7
Φ – Phase Margin
80°
75°
70°
65°
60°
55°
50°
45°
40°
35°
30°
– 50 – 25 0 25 50 75 100 125
TA – Free-Air T emperature – °C
OP37
PHASE MARGIN AND
GAIN-BANDWIDTH PRODUCT
vs
FREE-AIR TEMPERATURE
GBW (f = 10 kHz)
85
80
75
70
65
60
55
50
45
40
φ
m
m
φ
Φ – Phase Margin
m
φ
φ
m
V
CC±
= ±15 V
Gain-Bandwidth Product – MHz
80°
70°
60°
50°
40°
85°
10.6
10.2
9.8
9.4
9
11
Figure 20 Figure 21
V
EQUIVALENT INPUT NOISE VOLTAGE
vs
BANDWIDTH
V
CC±
= ±15 V
RS = 20 Ω
TA = 25°C
nV/ Hz
n
– Equivalent Input Noise Voltage –
Total Equivalent Input Noise Voltage –
µV
10
1
0.1
0.01
0.1
110
100
Bandwidth – kHz
(0.1 Hz to frequency indicated)
TOTAL EQUIVALENT INPUT NOISE VOLTAGE
vs
SOURCE RESISTANCE
10 k1 k
100
100
10
1
RS – Source Resistance – Ω
–
+
RS = R1 + R2
R1
R2
f = 1 kHz
Resistor Noise Only
f = 10 Hz
V
CC±
= ±15 V
BW = 1 Hz
TA = 25°C
Figure 22 Figure 23
†
Data for temperatures below – 25°C and above 85°C are applicable to the OP27A, OP27C, OP37A, and OP37C only.
OP27A, OP27C, OP27E, OP27G
OP37A, OP37C, OP37E, OP37G
LOW-NOISE HIGH-SPEED PRECISION OPERATIONAL AMPLIFIERS
SLOS100B – FEBRUARY 1989 – REVISED AUGUST 1994
2–14
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
POST OFFICE BOX 1443
• HOUSTON, TEXAS 77251–1443
TYPICAL CHARACTERISTICS
†
nV/ Hz
OP27A, OP27E, OP37A, OP37E
EQUIVALENT INPUT NOISE VOLTAGE
vs
TOTAL SUPPLY VOLTAGE
V
CC+
– V
CC–
– Total Supply Voltage – V
RS = 20 Ω
BW = 1 Hz
TA = 25°C
f = 10 Hz
20
15
10
5
0
010203040
f = 1 kHz
– 50 – 25 0 25 50 75 100 12
5
TA – Free-Air T emperature – °C
OP27A, OP27E, OP37A, OP37E
EQUIVALENT INPUT NOISE VOLTAGE
vs
FREE-AIR TEMPERATURE
V
CC±
= ±15 V
RS = 20 Ω
BW = 1 Hz
5
4
3
2
1
V
n
– Equivalent Input Noise Voltage –
nV/
HzV
n
– Equivalent Input Noise Voltage –
f = 10 Hz
f = 1 kHz
Figure 24 Figure 25
nV/ HzV
n
– Equivalent Input Noise Voltage –
pA/
HzI
n
– Equivalent Input Noise Current –
OP27A, OP27E, OP37A, OP37E
EQUIVALENT INPUT NOISE VOLTAGE
vs
FREQUENCY
1
10 100
1000
f – Frequency – Hz
EQUIVALENT INPUT NOISE CURRENT
vs
FREQUENCY
10
1
0.1
f – Frequency – Hz
1/f Corner = 140 Hz
10
9
8
7
6
5
4
3
2
1
1/f Corner = 2.7 Hz
10
100 1 k
10 k
V
CC±
= ±15 V
RS = 20 Ω
BW = 1 Hz
TA = 25°C
V
CC±
= ±15 V
BW = 1 Hz
TA = 25°C
Figure 26 Figure 27
†
Data for temperatures below – 25°C and above 85°C are applicable to the OP27A, OP27C, OP37A, and OP37C only.
OP27A, OP27C, OP27E, OP27G
OP37A, OP37C, OP37E, OP37G
LOW-NOISE HIGH-SPEED PRECISION OPERATIONAL AMPLIFIERS
SLOS100B – FEBRUARY 1989 – REVISED AUGUST 1994
2–15
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
POST OFFICE BOX 1443
• HOUSTON, TEXAS 77251–1443
TYPICAL CHARACTERISTICS
†
012345
60
50
40
30
20
10
SHORT-CIRCUIT OUTPUT CURRENT
vs
ELAPSED TIME
SUPPLY CURRENT
vs
TOTAL SUPPLY VOLTAGE
V
CC+
– V
CC–
– Total Supply Voltage – V
TA = 125°C
5
4
3
2
1
515253545
I
CC
– Supply Current – mA
t – Time – minutes
I
OS
– Short-Circuit Output Current – mA
V
CC±
= ± 15 V
TA = 25°C
I
OS+
TA = – 55°C
OS
I
CC
I
I
OS–
TA = 25°C
Figure 28 Figure 29
V
OP27
VOLTAGE FOLLOWER
SMALL-SIGNAL
PULSE RESPONSE
80
60
40
20
0
– 20
– 40
– 60
– 80
O
– Output Voltage – mV
t – Time – µs
0 0.5 1 1.5 2 2.5 3
V
CC±
= ±15 V
AV = 1
CL = 15 pF
TA = 25°C
V
O
– Output Voltage – V
OP27
VOLTAGE FOLLOWER
LARGE-SIGNAL
PULSE RESPONSE
8
6
4
0
– 2
– 4
– 6
– 8
2
t – Time – µs
024681012
VCC ± = ± 15 V
AV = – 1
TA = 25°C
Figure 30 Figure 31
†
Data for temperatures below – 25°C and above 85°C are applicable to the OP27A, OP27C, OP37A, and OP37C only.
OP27A, OP27C, OP27E, OP27G
OP37A, OP37C, OP37E, OP37G
LOW-NOISE HIGH-SPEED PRECISION OPERATIONAL AMPLIFIERS
SLOS100B – FEBRUARY 1989 – REVISED AUGUST 1994
2–16
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
POST OFFICE BOX 1443
• HOUSTON, TEXAS 77251–1443
TYPICAL CHARACTERISTICS
V
OP37
VOLTAGE-FOLLOWER
SMALL-SIGNAL PULSE RESPONSE
80
60
40
20
0
– 20
– 40
– 60
– 80
O
– Output Voltage – mV
t – Time – µs
0 0.2 0.4 0.6 0.8 1 1.2
V
CC±
= ±15 V
AV = 5
CL = 15 pF
TA = 25°C
V
O
– Output Voltage – V
OP37
VOLTAGE-FOLLOWER
LARGE-SIGNAL PULSE RESPONSE
8
6
4
0
– 2
– 4
– 6
– 8
2
t – Time – µs
0123456
V
CC±
= ±15 V
AV = 5
TA = 25°C
Figure 32 Figure 33
APPLICATION INFORMATION
general
The OP27 and OP37 series devices can be inserted directly onto OP07, OP05, µA725, and SE5534 sockets
with or without removing external compensation or nulling components. In addition, the OP27 and OP37 can
be fitted to µA741 sockets by removing or modifying external nulling components.
noise testing
Figure 34 shows a test circuit for 0.1-Hz to 10-Hz peak-to-peak noise measurement of the OP27 and OP37. The
frequency response of this noise tester indicates that the 0.1-Hz corner is defined by only one zero. Because
the time limit acts as an additional zero to eliminate noise contributions from the frequency band below 0.1 Hz,
the test time to measure 0.1-Hz to 10-Hz noise should not exceed 10 seconds.
Measuring the typical 80-nV peak-to-peak noise performance of the OP27 and OP37 requires the following
special test precautions:
1. The device should be warmed up for at least five minutes. As the operational amplifier warms up, the
offset voltage typically changes 4 µV due to the chip temperature increasing from 10°C to 20°C starting
from the moment the power supplies are turned on. In the 10-s measurement interval, these
temperature-induced effects can easily exceed tens of nanovolts.
2. For similar reasons, the device should be well shielded from air currents to eliminate the possibility of
thermoelectric effects in excess of a few nanovolts, which would invalidate the measurements.
3. Sudden motion in the vicinity of the device should be avoided, as it produces a feedthrough effect that
increases observed noise.
OP27A, OP27C, OP27E, OP27G
OP37A, OP37C, OP37E, OP37G
LOW-NOISE HIGH-SPEED PRECISION OPERATIONAL AMPLIFIERS
SLOS100B – FEBRUARY 1989 – REVISED AUGUST 1994
2–17
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
POST OFFICE BOX 1443
• HOUSTON, TEXAS 77251–1443
APPLICATION INFORMATION
4.3 kΩ
110 kΩ
2.2 µF
Oscilloscope
Rin = 1 MΩ
22 µF
100 kΩ
0.1 µF
LT1001
4.7 µF
2 kΩ
100 kΩ
10 Ω
0.1 µF
Voltage
Gain = 50,000
+
–
OP27/OP37
Device
Under
Test
24.3 kΩ
0.01 0.1 1 10 100
A
VD
– Differential Voltage Amplification – dB
100
90
80
70
60
50
40
30
f – Frequency – Hz
+
–
NOTE: All capacitor values are for nonpolarized capacitors only.
Figure 34. 0.1-Hz to 10-Hz Peak-to-Peak Noise Test Circuit and Frequency Response
OP27A, OP27C, OP27E, OP27G
OP37A, OP37C, OP37E, OP37G
LOW-NOISE HIGH-SPEED PRECISION OPERATIONAL AMPLIFIERS
SLOS100B – FEBRUARY 1989 – REVISED AUGUST 1994
2–18
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
POST OFFICE BOX 1443
• HOUSTON, TEXAS 77251–1443
APPLICATION INFORMATION
When measuring noise on a large number of units, a noise-voltage density test is recommended. A 10-Hz
noise-voltage density measurement correlates well with a 0.1-Hz to 10-Hz peak-to-peak noise reading since
both results are determined by the white noise and the location of the 1/f corner frequency.
Figure 35 shows a circuit measuring current noise and the formula for calculating current noise.
+
–
10kΩ
V
no
100 Ω 500 kΩ
500 kΩ
[V
no
2
– (130 nV)2]
1/2
1 MΩ × 100
In =
Figure 35. Current Noise Test Circuit and Formula
offset voltage adjustment
The input offset voltage and temperature coefficient of the OP27 and OP37 are permanently trimmed to a low
level at wafer testing. However, if further adjustment of V
IO
is necessary , using a 10-kΩ nulling potentiometer
as shown in Figure 36 does not degrade the temperature coefficient α
VIO
. Trimming to a value other than zero
creates an α
VIO
of VIO/300 µV/°C. For example, if VIO is adjusted to 300 µV, the change in α
VIO
is 1 µV/°C.
The adjustment range with a 10-kΩ potentiometer is approximately ±2.5 mV. If a smaller adjustment range is
needed, the sensitivity and resolution of the nulling can be improved by using a smaller potentiometer in
conjunction with fixed resistors. The example in Figure 37 has an approximate null range of ±200 µV.
+
–
–15 V
Output
2
3
7
8
4
1
Input
6
15 V
10 kΩ
–15 V
Output
2
3
7
8
4
1
Input
6
4.7 kΩ
Figure 36. Standard Input Offset
Voltage Adjustment
Figure 37. Input Offset Voltage Adjustment With
Improved Sensitivity
15 V
1 kΩ
4.7 kΩ
offset voltage and drift
Unless proper care is exercised, thermoelectric effects caused by temperature gradients across dissimilar
metals at the contacts to the input terminals can exceed the inherent temperature coefficient ∝V
IO
of the
amplifier. Air currents should be minimized, package leads should be short, and the two input leads should be
close together and at the same temperature.
OP27A, OP27C, OP27E, OP27G
OP37A, OP37C, OP37E, OP37G
LOW-NOISE HIGH-SPEED PRECISION OPERATIONAL AMPLIFIERS
SLOS100B – FEBRUARY 1989 – REVISED AUGUST 1994
2–19
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
POST OFFICE BOX 1443
• HOUSTON, TEXAS 77251–1443
APPLICATION INFORMATION
offset voltage and drift (continued)
The circuit shown in Figure 38 measures offset voltage. This circuit can also be used as the burn-in configuration
for the OP27 and OP37 with the supply voltage increased to 20 V, R1 = R3 = 10 kΩ, R2 = 200 Ω, and
A
VD
= 100.
15 V
+
–
–15 V
R1
50 kΩ
R2
100 Ω
R3
50 kΩ
VO = 1000 V
IO
2
3
6
7
4
NOTE A: Resistors must have low thermoelectric potential.
Figure 38. Test Circuit for Offset Voltage and Offset Voltage
T emperature Coefficient
unity gain buffer applications
The resulting output waveform, when R
f
≤ 100 Ω and the input is driven with a fast large-signal pulse (> 1 V),
is shown in the pulsed-operation diagram in Figure 39.
+
–
R
f
Output
2.8 V/µs
OP27
Figure 39. Pulsed Operation
During the initial (fast-feedthrough-like) portion of the output waveform, the input protection diodes effectively
short the output to the input, and a current, limited only by the output short-circuit protection, is drawn by the
signal generator. When R
f
≥ 500 Ω, the output is capable of handling the current requirements (load
current ≤ 20 mA at 10 V), the amplifier stays in its active mode, and a smooth transition occurs. When
R
f
> 2 kΩ, a pole is created with Rf and the amplifier’s input capacitance, creating additional phase shift and
reducing the phase margin. A small capacitor (20 pF to 50 pF) in parallel with R
f
eliminates this problem.
OP27A, OP27C, OP27E, OP27G
OP37A, OP37C, OP37E, OP37G
LOW-NOISE HIGH-SPEED PRECISION OPERATIONAL AMPLIFIERS
SLOS100B – FEBRUARY 1989 – REVISED AUGUST 1994
2–20
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
POST OFFICE BOX 1443
• HOUSTON, TEXAS 77251–1443
APPLICATION INFORMATION
To Gate
Drive
#1
+
–
Typical
Multiplexing
FET Switches
#2
+
–
#24
+
–
Cold-Junction
Circuitry
+
–
–
+
Output
0.05 µF
100 kΩ
High-Quality
Single-Point Ground
10 Ω
AVD = 10,000
Type S Thermocouples
5.4 µV/°C at 0°C
60
40
20
0
0246
Noise Voltage – nV
80
100
t – Time – seconds
120
810
OP27
NOTE A: If 24 channels are multiplexed per second and the output is required to settle to 0.1 % accuracy, the amplifier’s bandwidth cannot be
limited to less than 30 Hz. The peak-to-peak noise contribution of the OP27 will still be only 0.1 1 µV, which is equivalent to an error
of only 0.02°C.
Figure 40. Low-Noise, Multiplexed Thermocouple Amplifier and 0.1-Hz To 10-Hz
Peak-to-Peak Noise Voltage
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pertaining to warranty, patent infringement, and limitation of liability.
TI warrants performance of its semiconductor products to the specifications applicable at the time of sale in
accordance with TI’s standard warranty. Testing and other quality control techniques are utilized to the extent
TI deems necessary to support this warranty. Specific testing of all parameters of each device is not necessarily
performed, except those mandated by government requirements.
CERT AIN APPLICATIONS USING SEMICONDUCTOR PRODUCTS MAY INVOLVE POTENTIAL RISKS OF
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APPLICATIONS”). TI SEMICONDUCTOR PRODUCTS ARE NOT DESIGNED, AUTHORIZED, OR
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In order to minimize risks associated with the customer’s applications, adequate design and operating
safeguards must be provided by the customer to minimize inherent or procedural hazards.
TI assumes no liability for applications assistance or customer product design. TI does not warrant or represent
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Copyright 1998, Texas Instruments Incorporated
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