OP27A, OP27C
LOW-NOISE HIGH-SPEED PRECISION OPERATIONAL AMPLIFIERS
SLOS100E − FEBRUARY 1989 − REVISED FEBRUARY 2010
D Replacements for ADI, PMI and LTC OP27
JG PACKAGE
(TOP VIEW)
Series
Features of OP27A and OP27C:
D Maximum Equivalent Input Noise Voltage:
3.8 nV/√Hz at 1 kHz
5.5 nV/√Hz at 10 kHz
D Very Low Peak-to-Peak Noise Voltage at
0.1 Hz to 10 Hz . . . 80 nV Typ
D Low Input Offset Voltage
OP27A . . . 25 μV Max
OP27C . . . 100 μV Max
D High Voltage Amplification
OP27A . . . 1 V/ μV Min
OP27C . . . 0.7 V/ μV Min
VIOTRIM
IN −
IN +
VCC −
1
8
2
7
3
6
4
5
VIOTRIM
VCC +
OUT
NC
NC
VIOTRIM
NC
VIOTRIM
NC
FK PACKAGE
(TOP VIEW)
NC
1N −
NC
IN +
NC
description
3 2 1 20 19
18
5
17
6
16
7
15
8
14
9 10 11 12 13
NC
VCC +
NC
OUT
NC
NC
VCC −
NC
NC
NC
The OP27 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 make
these devices excellent choices for low-noise
amplifier applications requiring precision
performance and reliability.
The OP27 series is compensated for unity gain.
4
NC − No internal connection
symbol
IN +
3
+
6
IN −
The OP27A and OP27C are characterized for
operation over the full military temperature range
of −55°C to 125°C.
2
OUT
−
1
8
VIO TRIM
Pin numbers are for the JG packages.
AVAILABLE OPTIONS
PACKAGE
TA
−55°C
55°C to 125°C
VIOmax
AT 25°C
STABLE
GAIN
25 μV
100 μV
CERAMIC DIP
(JG)
CHIP CARRIER
(FK)
1
OP27AJG
OP27AFK
1
OP27CJG
—
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
Copyright © 2010, Texas Instruments Incorporated
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.
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
1
Template Release Date: 7−11−94
Q3
C1 = 120 pF for OP27
†
Q2A
Q1B Q2B
IN +
Q28
Q27
Q24
Q23
Q1A
Q26
Q12
C1†
Q22
480 μA
Q46
Q20
Q21
260
μA
750
μA
Q6
340
μA
120
μA
240 μA
Q45
Q11
VCC −
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
IN −
OP27A, OP27C
LOW-NOISE HIGH-SPEED PRECISION OPERATIONAL-AMPLIFIER
VIO TRIM
VIO TRIM
VCC +
Q19
OUT
SLOS100E − FEBRUARY 1989 − REVISED FEBRUARY 2010
2
schematic
OP27A, OP27C
LOW-NOISE HIGH-SPEED PRECISION OPERATIONAL-AMPLIFIER
SLOS100E − FEBRUARY 1989 − REVISED FEBRUARY 2010
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
Supply voltage, VCC + (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 V
Supply voltage, VCC − (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 V
Input voltage, VI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . VCC ±
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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −55°C to 125°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
NOTES: 1. All voltage values are with respect to the midpoint between VCC + and VCC − 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
1050 mW
1375 mW
8.4 mW/°C
11.0 mW/°C
546 mW
715 mW
210 mW
275 mW
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
3
OP27A, OP27C
LOW-NOISE HIGH-SPEED PRECISION OPERATIONAL-AMPLIFIER
SLOS100E − FEBRUARY 1989 − REVISED FEBRUARY 2010
recommended operating conditions
OP27A
MIN
NOM
OP27C
MAX
MIN
NOM
MAX
UNIT
Supply voltage, VCC +
4
15
22
4
15
22
V
Supply voltage, VCC −
−4
−15
−22
−4
−15
−22
V
Common mode input voltage,
Common-mode
voltage VIC
VCC ± = ± 15 V,
TA = 25°C
VCC ± = ± 15 V,
TA = − 55°C to 125°C
Operating free-air temperature, TA
± 11
± 11
± 10.3
± 10.2
−55
125
V
−55
125
°C
electrical characteristics at specified free-air temperature, VCC ± = ±15 V (unless otherwise noted)
PARAMETER
VIO
Input offset voltage
αVIO
Average temperature
coefficient of input
offset voltage
TA†
TEST CONDITIONS
VO = 0,
RS = 50 Ω,
VIC = 0
See Note 3
OP27A
MIN
25°C
See Note 4
IIO
Input offset current
VO = 0
0,
VIC = 0
IIB
Input bias current
VO = 0
0,
VIC = 0
Common mode input
Common-mode
voltage range
Full range
AVD
Large-signal
Large
signal differential
voltage amplification
1
0.4
2
μV/mo
7
35
12
75
50
±10
135
± 40
± 15
± 60
11
to
−11
10.3
to
−10.3
10.5
to
−10.5
± 11.5
1000
1800
VO = ± 10 V
800
1500
250
700
600
Common-mode input
resistance
ro
Output resistance
VO = 0,
Common-mode
Common
mode rejection
ratio
25°C
114
CMRR
VIC = ± 11 V
VIC = ± 10 V
Full range
110
kSVR
Supply voltage rejection
ratio
25°C
100
Full range
96
25°C
VCC ± = ± 4 V to ± 18 V
VCC ± = ± 4.5 V to ± 18 V
V
± 10 ± 11.5
700
V
1500
1500
200
500
V/mV
300
70
†
nA
± 11.5 ± 13.5
3
IO = 0
nA
10.5
VO = ± 10 V
ri(CM)
± 80
± 150
11
to
−11
RL ≥ 1 kΩ,
Full range
μV
V
0.2
RL ≥ 2 kΩ,
VO = ± 10 V
300
μV/°C
± 10 ± 11.5
RL ≥ 2 kΩ,
100
1.8
± 12 ± 13.8
RL ≥ 0.6 kΩ, VO = ± 1 V,
VCC± = ± 4 V
30
UNIT
0.4
RL ≥ 2 kΩ
Full range
MAX
0.6
RL ≥ 0.6 kΩ
RL ≥ 2 kΩ
TYP
0.2
Full range
25°C
Peak output voltage swing
25
Full range
25°C
VOM
10
MIN
60
25°C
VICR
MAX
Full range
Full range
Long-term drift of input
offset voltage
OP27C
TYP
126
100
2
GΩ
70
Ω
120
dB
94
120
94
86
118
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).
4
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
OP27A, OP27C
LOW-NOISE HIGH-SPEED PRECISION OPERATIONAL-AMPLIFIER
SLOS100E − FEBRUARY 1989 − REVISED FEBRUARY 2010
OP27 operating characteristics, VCC ± = ±15 V, TA = 255C
OP27A
PARAMETER
TEST CONDITIONS
TYP
1.7
2.8
MAX
MIN
TYP
1.7
2.8
MAX
SR
Slew rate
AVD ≥ 1,
VN(PP)
Peak-to-peak equivalent
input noise voltage
f = 0.1 Hz to 10 Hz, RS = 20 Ω,
See Figure 26
0.225
0.375
0.225
0.375
f = 10 Hz,
8
3.8
8
Equivalent input noise voltage
RS = 20 Ω
3.5
Vn
f = 1 kHz,
RS = 20 Ω
3
4
3.2
4
In
Equivalent input noise current
Gain-bandwidth product
RL ≥ 2 kΩ
MIN
OP27C
V/μs
f = 10 Hz,
See Figure 27
5
25
5
25
f = 1 kHz,
See Figure 27
0.7
2.5
0.7
2.5
f = 100 kHz
POST OFFICE BOX 655303
5
• DALLAS, TEXAS 75265
8
5
8
UNIT
μV
nV/√H
nV/√Hz
pA/√H
pA/√Hz
MHz
5
OP27A, OP27C
LOW-NOISE HIGH-SPEED PRECISION OPERATIONAL-AMPLIFIER
SLOS100E − FEBRUARY 1989 − REVISED FEBRUARY 2010
TYPICAL CHARACTERISTICS
Table of Graphs
FIGURE
VIO
Input offset voltage
vs Temperature
1
ΔVIO
Change in input offset voltage
vs Time after power on
vs Time (long-term drift)
2
3
IIO
Input offset current
vs Temperature
4
IIB
Input bias current
vs Temperature
5
VICR
Common-mode input voltage range
vs Supply voltage
6
VOM
Maximum peak output voltage
vs Load resistance
7
VO(PP)
Maximum peak-to-peak output voltage
vs Frequency
8
AVD
Differential voltage amplification
vs Supply voltage
vs Load resistance
vs Frequency
CMRR
Common-mode rejection ratio
vs Frequency
13
kSVR
Supply voltage rejection ratio
vs Frequency
14
SR
Slew rate
vs Temperature
15
φm
Phase margin
vs Temperature
16
φ
Phase shift
vs Frequency
11
Equivalent input noise voltage
vs Bandwidth
vs Source resistance
vs Supply voltage
vs Temperature
vs Frequency
17
18
19
20
21
Vn
6
9
10
11, 12
Gain-bandwidth product
vs Temperature
16
IOS
Short-circuit output current
vs Time
22
ICC
Supply current
vs Supply voltage
23
Pulse response
Small signal
Large signal
24
25
POST OFFICE BOX 655303
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OP27A, OP27C
LOW-NOISE HIGH-SPEED PRECISION OPERATIONAL-AMPLIFIER
SLOS100E − FEBRUARY 1989 − REVISED FEBRUARY 2010
TYPICAL CHARACTERISTICS
INPUT OFFSET VOLTAGE OF
REPRESENTATIVE INDIVIDUAL UNITS
vs
FREE-AIR TEMPERATURE
WARM-UP CHANGE IN
INPUT OFFSET VOLTAGE
vs
ELAPSED TIME
100
VCC ± = ± 15 V
ΔV IO − Change in Input Offset Voltage − μV
80
OP27A
40
OP27A
20
0
− 20
− 40
OP27C
− 60
− 80
− 100
− 50
10
OP27C
5
OP27A
0
− 25
0
25
50
75
100
125
1
TA − Free-Air Temperature − °C
2
3
4
5
Time After Power On − minutes
Figure 1
Figure 2
LONG-TERM DRIFT OF INPUT OFFSET VOLTAGE OF
REPRESENTATIVE INDIVIDUAL UNITS
6
ΔV IO − Change in Input Offset Voltage − μV
VIO − Input Offset Voltage − μV
OP27C
60
VCC ± = ± 15 V
TA = 25°C
0.2-μV/mo Trend Line
4
2
0
−2
−4
0.2-μV/mo Trend Line
−6
0
1
2
3
4
5
6
7
8
Time − months
Figure 3
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• DALLAS, TEXAS 75265
7
OP27A, OP27C
LOW-NOISE HIGH-SPEED PRECISION OPERATIONAL-AMPLIFIER
SLOS100E − FEBRUARY 1989 − REVISED FEBRUARY 2010
TYPICAL CHARACTERISTICS
INPUT OFFSET CURRENT
vs
FREE-AIR TEMPERATURE
INPUT BIAS CURRENT
vs
FREE-AIR TEMPERATURE
± 50
50
40
I IB − Input Bias Current − nA
I IO − Input Offset Current − nA
VCC ± = ± 15 V
30
20
OP27C
10
VCC ± = ± 15 V
± 40
± 30
± 20
OP27C
± 10
OP27A
OP27A
0
− 75
− 50
− 25
0
25
50
75
100
0
− 75
125
− 50 − 25
TA − Free-Air Temperature − °C
COMMON-MODE INPUT VOLTAGE RANGE LIMITS
vs
SUPPLY VOLTAGE
75
100
125
MAXIMUM PEAK OUTPUT VOLTAGE
vs
LOAD RESISTANCE
20
16
TA = − 55°C
VOM − Maximum Peak Output Voltage − V
VVICR
ICR − Common-Mode Input Voltage Range Limits − V
50
Figure 5
12
TA = 25°C
8
4
TA = 125°C
0
−4
TA = − 55°C
−8
TA = 25°C
− 12
TA = 125°C
− 16
0
±5
±10
± 15
± 20
18
VCC ± = ± 15 V
TA = 25°C
16
14
Positive
Swing
12
10
Negative
Swing
8
6
4
2
0
0.1
VCC + − Supply Voltage − V
1
RL − Load Resistance − kΩ
Figure 6
8
25
TA − Free-Air Temperature − °C
Figure 4
ÁÁ
ÁÁ
ÁÁ
0
Figure 7
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
10
OP27A, OP27C
LOW-NOISE HIGH-SPEED PRECISION OPERATIONAL-AMPLIFIER
SLOS100E − FEBRUARY 1989 − REVISED FEBRUARY 2010
TYPICAL CHARACTERISTICS
OP27
VV
OPP − Maximum Peak-to-Peak Output Voltage − V
O(PP)
MAXIMUM PEAK-TO-PEAK
OUTPUT VOLTAGE
vs
FREQUENCY
28
VCC ± = ± 15 V
RL = 1 kΩ
TA = 25°C
24
20
16
12
8
ÁÁ
ÁÁ
ÁÁ
ÁÁ
4
0
1k
10 k
100 k
1M
f − Frequency − Hz
10 M
OP27A
OP27A
LARGE-SIGNAL
DIFFERENTIAL VOLTAGE AMPLIFICATION
vs
TOTAL SUPPLY VOLTAGE
LARGE-SIGNAL
DIFFERENTIAL VOLTAGE AMPLIFICATION
vs
LOAD RESISTANCE
2500
2400
A VD − Differential Voltage Amplification − V/mV
A VD − Differential Voltage Amplification − V/mV
Figure 8.
VO = ± 10 V
TA = 25°C
2000
RL = 2 kΩ
1500
RL = 1 kΩ
1000
500
0
0
10
20
30
40
50
2200
2000
VCC ± = ± 15 V
VO = ± 10 V
TA = 25°C
1800
1600
1400
1200
1000
800
600
400
0.1
VCC + − VCC − − Total Supply Voltage − V
1
10
100
RL − Load Resistance − kΩ
Figure 9
Figure 10
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
9
OP27A, OP27C
LOW-NOISE HIGH-SPEED PRECISION OPERATIONAL-AMPLIFIER
SLOS100E − FEBRUARY 1989 − REVISED FEBRUARY 2010
TYPICAL CHARACTERISTICS
OP27
A VD − Differential Voltage Amplification − dB
LARGE-SIGNAL DIFFERENTIAL
VOLTAGE AMPLIFICATION AND PHASE SHIFT
vs
FREQUENCY
25
80°
VCC ± = ± 15 V
RL = 1 kΩ
TA = 25°C
20
15
120°
Phase Shift
φ m = 70°
10
100°
140°
5
160°
0
180°
AVD
−5
200°
− 10
220°
100
10
f − Frequency − Hz
1
Figure 11.
OP27A
OP27A
COMMON-MODE REJECTION RATIO
vs
FREQUENCY
140
140
VCC ± = ± 15 V
RL = 2 kΩ
TA = 25°C
120
100
80
60
40
OP27A
20
0
−20
0.1
1
10
100 1 k 10 k
f − Frequency − Hz
1M
100 M
CMRR − Common-Mode Rejection Ratio − dB
A VD − Differential Voltage Amplification − dB
LARGE-SIGNAL
DIFFERENTIAL VOLTAGE AMPLIFICATION
vs
FREQUENCY
120
100
80
OP27A
60
40
1k
10 k
100 k
f − Frenquency − Hz
Figure 12
10
VCC ± = ± 15 V
VIC = ± 10 V
TA = 25°C
Figure 13
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
1M
10 M
OP27A, OP27C
LOW-NOISE HIGH-SPEED PRECISION OPERATIONAL-AMPLIFIER
SLOS100E − FEBRUARY 1989 − REVISED FEBRUARY 2010
TYPICAL CHARACTERISTICS
SUPPLY VOLTAGE REJECTION RATIO
vs
FREQUENCY
SLEW RATE
vs
FREE-AIR TEMPERATURE
6
VCC ± = ± 4 V to ± 18 V
TA = 25°C
140
100
SR − Slew Rate − V/ μ s
120
Negative
Supply
80
60
VCC ± = ± 15 V
RL ≥ 2 kΩ
4
OP27
(AVD ≥ 1)
2
40
Positive
Supply
0
1
10
100
1k
10 k 100 k 1 M
0
− 50
10 M 100 M
− 25
f − Frequency − Hz
0
25
50
75
100
TA − Free Air Temperature − °C
Figure 14
125
Figure 15
OP27
PHASE MARGIN AND
GAIN-BANDWIDTH PRODUCT
vs
FREE-AIR TEMPERATURE
85°
80°
11
VCC ± = ± 15 V
10.6
75°
10.2
φm
70°
9.8
65°
9.4
60°
9
55°
8.6
ÁÁ
ÁÁ
50°
GBW (f = 100 kHz)
8.2
45°
7.8
40°
7.4
35°
− 75
− 50
− 25
0
25
50
75
100
Gain-Bandwidth Product − MHz
20
Φ − Phase Margin
φm
kSVR − Supply Voltage Rejection Ratio − dB
160
7
125
TA − Free-Air Temperature − °C
Figure 16.
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
11
OP27A, OP27C
LOW-NOISE HIGH-SPEED PRECISION OPERATIONAL-AMPLIFIER
SLOS100E − FEBRUARY 1989 − REVISED FEBRUARY 2010
TYPICAL CHARACTERISTICS
EQUIVALENT INPUT NOISE VOLTAGE
vs
BANDWIDTH
TOTAL EQUIVALENT INPUT NOISE VOLTAGE
vs
SOURCE RESISTANCE
100
1
0.1
0.01
0.1
VCC ± = ± 15 V
BW = 1 Hz
TA = 25°C
Hz
VCC ± = ± 15 V
RS = 20 Ω
TA = 25°C
Total Equivalent Input Noise Voltage − nV/
Vn − Equivalent Input Noise Voltage − μV
10
1
10
Bandwidth − kHz
(0.1 Hz to frequency indicated)
100
10
f = 10 Hz
Resistor Noise Only
f = 1 kHz
1
100
1k
OP27A
OP27A
EQUIVALENT INPUT NOISE VOLTAGE
vs
TOTAL SUPPLY VOLTAGE
EQUIVALENT INPUT NOISE VOLTAGE
vs
FREE-AIR TEMPERATURE
5
Vn − Equivalent Input Noise Voltage − nV/ Hz
Vn − Equivalent Input Noise Voltage − nV/ Hz
Figure 18
15
f = 10 Hz
f = 1 kHz
10
5
0
10
20
30
40
VCC ± = ± 15 V
RS = 20 Ω
BW = 1 Hz
f = 10 Hz
4
3
f = 1 kHz
2
1
− 50
− 25
0
25
Figure 19
Figure 20
POST OFFICE BOX 655303
50
75
TA − Free-Air Temperature − °C
VCC + − VCC − − Total Supply Voltage − V
12
10 k
RS − Source Resistance − Ω
RS = 20 Ω
BW = 1 Hz
TA = 25°C
0
−
+
R2
RS = R1 + R2
Figure 17
20
R1
• DALLAS, TEXAS 75265
100
125
OP27A, OP27C
LOW-NOISE HIGH-SPEED PRECISION OPERATIONAL-AMPLIFIER
SLOS100E − FEBRUARY 1989 − REVISED FEBRUARY 2010
TYPICAL CHARACTERISTICS
OP27A
Vn − Equivalent Input Noise Voltage − nV/ Hz
EQUIVALENT INPUT NOISE VOLTAGE
vs
FREQUENCY
10
9
8
7
VCC ± = ± 15 V
RS = 20 Ω
BW = 1 Hz
TA = 25°C
6
5
4
3
1/f Corner = 2.7 Hz
2
1
10
1
100
1000
f − Frequency − Hz
Figure 21
SHORT-CIRCUIT OUTPUT CURRENT
vs
ELAPSED TIME
SUPPLY CURRENT
vs
TOTAL SUPPLY VOLTAGE
ÁÁ
ÁÁ
ÁÁ
5
VCC ± = ± 15 V
TA = 25°C
50
IICC
CC − Supply Current − mA
IIOS
OS − Short-Circuit Output Current − mA
60
IOS −
40
ÁÁ
ÁÁ
ÁÁ
30
IOS +
20
10
4
TA = 125°C
3
TA = 25°C
2
TA = − 55°C
1
0
1
2
3
t − Time − minutes
4
5
5
15
25
35
45
VCC + − VCC − − Total Supply Voltage − V
Figure 22
Figure 23
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13
OP27A, OP27C
LOW-NOISE HIGH-SPEED PRECISION OPERATIONAL-AMPLIFIER
SLOS100E − FEBRUARY 1989 − REVISED FEBRUARY 2010
OP27
OP27
VOLTAGE FOLLOWER
SMALL-SIGNAL
PULSE RESPONSE
VOLTAGE FOLLOWER
LARGE-SIGNAL
PULSE RESPONSE
80
8
60
6
40
4
VO − Output Voltage − V
VO − Output Voltage − mV
TYPICAL CHARACTERISTICS
20
0
− 20
VCC ± = ± 15 V
AV = 1
CL = 15 pF
TA = 25°C
− 40
− 60
2
0
−2
−4
VCC ± = ± 15 V
AV = − 1
TA = 25°C
−6
− 80
−8
0
0.5
1
1.5
t − Time − μs
2
2.5
0
3
Figure 24
2
4
6
t − Time − μs
8
10
12
Figure 25
APPLICATION INFORMATION
general
The OP27 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 can be fitted to μA741 sockets
by removing or modifying external nulling components.
noise testing
Figure 26 shows a test circuit for 0.1-Hz to 10-Hz peak-to-peak noise measurement of the OP27. 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 requires the following special test
precautions:
14
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• DALLAS, TEXAS 75265
OP27A, OP27C
LOW-NOISE HIGH-SPEED PRECISION OPERATIONAL-AMPLIFIER
SLOS100E − FEBRUARY 1989 − REVISED FEBRUARY 2010
APPLICATION INFORMATION
noise testing (continued)
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.
AVD − Differential Voltage Amplification − dB
100
90
80
70
60
50
40
30
0.01
0.1
1
10
f − Frequency − Hz
100
0.1 μF
100 kΩ
10 Ω
−
LT1001
2 kΩ
+
−
+
OP27
Device
Under
Test
Voltage
Gain = 50,000
4.7 μF
4.3 kΩ
100 kΩ
2.2 μF
24.3 kΩ
0.1 μF
22 μF
Oscilloscope
Rin = 1 MΩ
110 kΩ
NOTE: All capacitor values are for nonpolarized capacitors only.
Figure 26. 0.1-Hz to 10-Hz Peak-to-Peak Noise Test Circuit and Frequency Response
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
15
OP27A, OP27C
LOW-NOISE HIGH-SPEED PRECISION OPERATIONAL-AMPLIFIER
SLOS100E − FEBRUARY 1989 − REVISED FEBRUARY 2010
APPLICATION INFORMATION
noise testing (continued)
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 27 shows a circuit measuring current noise and the formula for calculating current noise.
10kΩ
100 Ω
500 kΩ
−
500 kΩ
+
Vno
In =
[Vno2 − (130 nV)2]1/2
1 MΩ × 100
Figure 27. Current Noise Test Circuit and Formula
offset voltage adjustment
The input offset voltage and temperature coefficient of the OP27 are permanently trimmed to a low level at wafer
testing. However, if further adjustment of VIO is necessary, using a 10-kΩ nulling potentiometer as shown in
Figure 28 does not degrade the temperature coefficient αVIO. Trimming to a value other than zero creates an
αVIO of VIO/300 μV/°C. For example, if VIO is adjusted to 300 μV, the change in αVIO 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 29 has an approximate null range of ± 200 μV.
4.7 kΩ
10 kΩ
1 kΩ
15 V
1
2
−
Input
3
+
15 V
8
4.7 kΩ
7 6
Output
2
4
Input
−15 V
1
8
7 6
3
Output
4
Figure 28. Standard Input Offset
Voltage Adjustment
−15 V
Figure 29. Input Offset Voltage Adjustment With
Improved Sensitivity
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 ∝VIO 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.
16
POST OFFICE BOX 655303
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OP27A, OP27C
LOW-NOISE HIGH-SPEED PRECISION OPERATIONAL-AMPLIFIER
SLOS100E − FEBRUARY 1989 − REVISED FEBRUARY 2010
APPLICATION INFORMATION
offset voltage and drift (continued)
The circuit shown in Figure 30 measures offset voltage. This circuit can also be used as the burn-in configuration
for the OP27 with the supply voltage increased to 20 V, R1 = R3 = 10 kΩ, R2 = 200 Ω, and
AVD = 100.
R1
50 kΩ
15 V
2
R2
100 Ω
3
R3
50 kΩ
7
−
+
6
VO = 1000 VIO
4
−15 V
NOTE A: Resistors must have low thermoelectric potential.
Figure 30. Test Circuit for Offset Voltage and Offset Voltage Temperature Coefficient
unity gain buffer applications
The resulting output waveform, when Rf ≤ 100 Ω and the input is driven with a fast large-signal pulse (>1 V),
is shown in the pulsed-operation diagram in Figure 31.
Rf
2.8 V/μs
−
Output
+
OP27
Figure 31. 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 Rf ≥ 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
Rf > 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 Rf eliminates this problem.
POST OFFICE BOX 655303
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17
OP27A, OP27C
LOW-NOISE HIGH-SPEED PRECISION OPERATIONAL-AMPLIFIER
SLOS100E − FEBRUARY 1989 − REVISED FEBRUARY 2010
APPLICATION INFORMATION
unity gain buffer applications (continued)
120
Noise Voltage − nV
100
80
60
40
20
0
0
2
4
8
6
10
t − Time − seconds
Type S Thermocouples
5.4 μV/°C at 0°C
+
#1
−
+
Cold-Junction
Circuitry
To Gate
Drive
+
−
#2
−
+
AVD = 10,000
+
OP27
−
Typical
Multiplexing
FET Switches
0.05 μF
#24
High-Quality
Single-Point Ground
−
Output
100 kΩ
10 Ω
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 0.11 μV, which is equivalent to an error
of only 0.02°C.
Figure 32. Low-Noise, Multiplexed Thermocouple Amplifier and
0.1-Hz to 10-Hz Peak-to-Peak Noise Voltage
18
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PACKAGE OPTION ADDENDUM
www.ti.com
6-Feb-2020
PACKAGING INFORMATION
Orderable Device
Status
(1)
Package Type Package Pins Package
Drawing
Qty
Eco Plan
Lead/Ball Finish
MSL Peak Temp
(2)
(6)
(3)
Op Temp (°C)
Device Marking
(4/5)
JM38510/13506BPA
ACTIVE
CDIP
JG
8
1
TBD
Call TI
N / A for Pkg Type
-55 to 125
JM38510
/13506BPA
M38510/13506BPA
ACTIVE
CDIP
JG
8
1
TBD
Call TI
N / A for Pkg Type
-55 to 125
JM38510
/13506BPA
OP27AFKB
ACTIVE
LCCC
FK
20
1
TBD
POST-PLATE
N / A for Pkg Type
OP27AFKB
OP27AJGB
ACTIVE
CDIP
JG
8
1
TBD
Call TI
N / A for Pkg Type
OP27AJGB
OP27CJGB
ACTIVE
CDIP
JG
8
1
TBD
Call TI
N / A for Pkg Type
OP27CJGB
(1)
The marketing status values are defined as follows:
ACTIVE: Product device recommended for new designs.
LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.
NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design.
PREVIEW: Device has been announced but is not in production. Samples may or may not be available.
OBSOLETE: TI has discontinued the production of the device.
(2)
RoHS: TI defines "RoHS" to mean semiconductor products that are compliant with the current EU RoHS requirements for all 10 RoHS substances, including the requirement that RoHS substance
do not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, "RoHS" products are suitable for use in specified lead-free processes. TI may
reference these types of products as "Pb-Free".
RoHS Exempt: TI defines "RoHS Exempt" to mean products that contain lead but are compliant with EU RoHS pursuant to a specific EU RoHS exemption.
Green: TI defines "Green" to mean the content of Chlorine (Cl) and Bromine (Br) based flame retardants meet JS709B low halogen requirements of
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