OP27 [TI]
低噪声高速精确运算放大器;
| 型号： | OP27 |
| 厂家： | 
TEXAS INSTRUMENTS |
| 描述： | 低噪声高速精确运算放大器 放大器 运算放大器 放大器电路 |
| 文件： | 总22页 (文件大小：314K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
OP27A, OP27C
LOW-NOISE HIGH-SPEED PRECISION OPERATIONAL AMPLIFIERS
SLOS100E − FEBRUARY 1989 − REVISED FEBRUARY 2010
JG PACKAGE
(TOP VIEW)
D
Replacements for ADI, PMI and LTC OP27
Series
Features of OP27A and OP27C:
VIOTRIM
IN−
VIOTRIM
VCC+
OUT
1
2
3
4
8
7
6
5
D
Maximum Equivalent Input Noise Voltage:
3.8 nV/√Hz at 1 kHz
IN +
VCC −
5.5 nV/√Hz at 10 kHz
NC
D
D
Very Low Peak-to-Peak Noise Voltage at
0.1 Hz to 10 Hz . . . 80 nV Typ
FK PACKAGE
(TOP VIEW)
Low Input Offset Voltage
OP27A . . . 25 μV Max
OP27C . . . 100 μV Max
D
High Voltage Amplification
OP27A . . . 1 V/μV Min
3
2
1
20 19
18
OP27C . . . 0.7 V/μV Min
NC
VCC+
NC
OUT
NC
NC
1N−
NC
IN+
NC
4
5
6
7
8
17
description
16
15
14
The OP27 operational amplifiers combine out-
standing 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.
9 10 11 12 13
NC − No internal connection
The outstanding characteristics of the OP27 make
these devices excellent choices for low-noise
amplifier applications requiring precision
performance and reliability.
symbol
3
+
IN+
IN −
6
OUT
The OP27 series is compensated for unity gain.
2
−
The OP27A and OP27C are characterized for
operation over the full military temperature range
of −55°C to 125°C.
1
8
V
TRIM
IO
Pin numbers are for the JG packages.
AVAILABLE OPTIONS
PACKAGE
V
max
STABLE
GAIN
IO
T
A
CERAMIC DIP
(JG)
CHIP CARRIER
(FK)
AT 25°C
25 μV
1
1
OP27AJG
OP27CJG
OP27AFK
—
−55°C to 125°C
100 μV
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.
1
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
schematic
V
IO
TRIM
V
IO
TRIM
V
CC +
750
μA
260
μA
480 μA
Q6
†
Q22
C1
Q20
Q46
Q21
Q23
Q24
Q1A
Q19
OUT
IN +
IN −
Q1B Q2B
Q2A
Q3
Q45
Q11
Q26
Q12
Q27
Q28
340
μA
240 μA
120
μA
V
CC −
†
C1 = 120 pF for OP27
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, V
Supply voltage, V
(see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 V
(see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 V
CC+
CC−
Input voltage, V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . V
I
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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −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 V
and V
unless otherwise noted.
CC+
CC−
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
T
≤ 25°C
DERATING FACTOR
T
= 85°C
T = 125°C
A
A
A
PACKAGE
POWER RATING
ABOVE T = 25°C
POWER RATING POWER RATING
A
JG
FK
1050 mW
1375 mW
8.4 mW/°C
11.0 mW/°C
546 mW
715 mW
210 mW
275 mW
3
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
OP27A, OP27C
LOW-NOISE HIGH-SPEED PRECISION OPERATIONAL-AMPLIFIER
SLOS100E − FEBRUARY 1989 − REVISED FEBRUARY 2010
recommended operating conditions
OP27A
OP27C
UNIT
MIN NOM
MAX
MIN NOM
MAX
22
Supply voltage, V
Supply voltage, V
4
−4
15
22
4
−4
15
V
V
CC+
−15
−22
−15
−22
CC−
V
V
=
=
15 V, T = 25°C
11
11
CC
A
Common-mode input voltage, V
V
IC
15 V, T = − 55°C to 125°C
10.3
−55
10.2
−55
CC
A
Operating free-air temperature, T
125
125
°C
A
electrical characteristics at specified free-air temperature, VCC = 15 V (unless otherwise noted)
OP27A
TYP
10
OP27C
TYP
30
†
PARAMETER
TEST CONDITIONS
= 0, = 0
T
UNIT
A
MIN
MAX
25
MIN
MAX
100
25°C
V
R
V
IC
O
V
IO
Input offset voltage
μV
= 50 Ω, See Note 3
S
Full range
60
300
Average temperature
coefficient of input
offset voltage
α
VIO
Full range
0.2
0.6
0.4
1.8 μV/°C
Long-term drift of input
offset voltage
See Note 4
0.2
7
1
0.4
12
2
μV/mo
nA
25°C
Full range
25°C
35
50
40
60
75
135
80
I
I
Input offset current
Input bias current
V
= 0,
= 0,
V
V
= 0
= 0
IO
O
O
IC
10
15
V
nA
IB
IC
Full range
150
11
to
−11
11
to
−11
25°C
Common-mode input
voltage range
V
ICR
V
10.3
to
10.5
to
Full range
−10.3
−10.5
R
R
R
R
R
R
≥ 2 kΩ
≥ 0.6 kΩ
≥ 2 kΩ
≥ 2 kΩ,
≥ 1 kΩ,
12
10
13.8
11.5
11.5
10
13.5
11.5
L
L
L
L
L
V
A
Peak output voltage swing
V
OM
Full range
Full range
11.5
1000
800
10.5
700
V
V
=
10 V
10 V
1 V,
1800
1500
1500
1500
O
O
O
=
=
Large-signal differential
voltage amplification
V/mV
≥ 0.6 kΩ, V
VD
L
250
600
700
200
300
500
V
CC
=
4 V
R
≥ 2 kΩ,
V
O
=
10 V
L
Common-mode input
resistance
r
r
3
2
GΩ
i(CM)
o
Output resistance
V
= 0,
I
= 0
25°C
25°C
70
70
Ω
O
O
V
V
V
V
=
=
11 V
10 V
114
110
100
96
126
100
94
120
IC
IC
Common-mode rejection
ratio
CMRR
dB
dB
Full range
25°C
=
=
4 V to 18 V
120
94
118
CC
CC
Supply voltage rejection
ratio
k
SVR
4.5 V to 18 V
Full range
86
†
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 V during the first 30 days are typically 2.5 μV
IO
(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
TYP
OP27C
TYP
PARAMETER
TEST CONDITIONS
UNIT
V/μs
μV
MIN
MAX
MIN
MAX
SR
V
Slew rate
A
≥ 1, ≥ 2 kΩ
R
1.7
2.8
1.7
2.8
VD
L
Peak-to-peak equivalent
input noise voltage
f = 0.1 Hz to 10 Hz, R = 20 Ω,
See Figure 26
S
0.225 0.375
0.225 0.375
N(PP)
f = 10 Hz,
f = 1 kHz,
f = 10 Hz,
f = 1 kHz,
f = 100 kHz
R
R
= 20 Ω
= 20 Ω
3.5
3
8
4
3.8
3.2
5
8
4
S
S
V
Equivalent input noise voltage
nV/√Hz
n
See Figure 27
See Figure 27
5
25
2.5
25
2.5
I
n
Equivalent input noise current
Gain-bandwidth product
pA/√Hz
0.7
8
0.7
8
5
5
MHz
5
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
OP27A, OP27C
LOW-NOISE HIGH-SPEED PRECISION OPERATIONAL-AMPLIFIER
SLOS100E − FEBRUARY 1989 − REVISED FEBRUARY 2010
TYPICAL CHARACTERISTICS
Table of Graphs
FIGURE
V
IO
Input offset voltage
vs Temperature
1
vs Time after power on
vs Time (long-term drift)
2
3
ΔV
Change in input offset voltage
IO
I
I
Input offset current
vs Temperature
vs Temperature
vs Supply voltage
vs Load resistance
vs Frequency
4
5
6
7
8
IO
Input bias current
IB
V
V
V
Common-mode input voltage range
Maximum peak output voltage
Maximum peak-to-peak output voltage
ICR
OM
O(PP)
vs Supply voltage
vs Load resistance
vs Frequency
9
10
11, 12
A
VD
Differential voltage amplification
CMRR Common-mode rejection ratio
vs Frequency
vs Frequency
vs Temperature
vs Temperature
vs Frequency
13
14
15
16
11
k
Supply voltage rejection ratio
Slew rate
SVR
SR
φ
m
Phase margin
φ
Phase shift
vs Bandwidth
17
18
19
20
21
vs Source resistance
vs Supply voltage
vs Temperature
vs Frequency
V
n
Equivalent input noise voltage
Gain-bandwidth product
Short-circuit output current
Supply current
vs Temperature
vs Time
16
22
23
I
I
OS
vs Supply voltage
CC
Small signal
Large signal
24
25
Pulse response
6
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
OP27A, OP27C
LOW-NOISE HIGH-SPEED PRECISION OPERATIONAL-AMPLIFIER
SLOS100E − FEBRUARY 1989 − REVISED FEBRUARY 2010
TYPICAL CHARACTERISTICS
INPUT OFFSET VOLTAGE OF
REPRESENTATIVE INDIVIDUAL UNITS
WARM-UP CHANGE IN
INPUT OFFSET VOLTAGE
vs
vs
FREE-AIR TEMPERATURE
ELAPSED TIME
100
80
V
CC
=
15 V
V
T
A
=
CC
= 25°C
15 V
OP27C
OP27A
60
10
OP27A
40
OP27C
20
0
− 20
− 40
− 60
− 80
− 100
5
OP27A
OP27C
0
− 50 − 25
0
25
50
75
100
125
1
2
3
4
5
T
A
− Free-Air Temperature − °C
Time After Power On − minutes
Figure 1
Figure 2
LONG-TERM DRIFT OF INPUT OFFSET VOLTAGE OF
REPRESENTATIVE INDIVIDUAL UNITS
6
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
7
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
OP27A, OP27C
LOW-NOISE HIGH-SPEED PRECISION OPERATIONAL-AMPLIFIER
SLOS100E − FEBRUARY 1989 − REVISED FEBRUARY 2010
TYPICAL CHARACTERISTICS
INPUT OFFSET CURRENT
vs
INPUT BIAS CURRENT
vs
FREE-AIR TEMPERATURE
FREE-AIR TEMPERATURE
= 15 V
CC
50
40
30
20
10
0
50
40
30
20
10
0
V
=
15 V
V
CC
OP27C
OP27C
OP27A
OP27A
− 75 − 50 − 25
0
25
50
75
100 125
− 75 − 50 − 25
0
25
50
75 100 125
T
A
− Free-Air Temperature − °C
T
A
− Free-Air Temperature − °C
Figure 4
Figure 5
COMMON-MODE INPUT VOLTAGE RANGE LIMITS
MAXIMUM PEAK OUTPUT VOLTAGE
vs
SUPPLY VOLTAGE
16
vs
LOAD RESISTANCE
20
18
16
14
12
10
V
T
=
15 V
CC
T
A
= −55°C
= 25°C
A
12
8
T
A
= 25°C
Positive
Swing
4
T
A
= 125°C
Negative
Swing
0
8
6
− 4
− 8
− 12
− 16
T
= − 55°C
A
T
A
= 25°C
4
2
0
T
= 125°C
A
0
5
10
15
20
0.1
1
10
V
CC+
− Supply Voltage − V
R − Load Resistance − kΩ
L
Figure 6
Figure 7
8
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
OP27A, OP27C
LOW-NOISE HIGH-SPEED PRECISION OPERATIONAL-AMPLIFIER
SLOS100E − FEBRUARY 1989 − REVISED FEBRUARY 2010
TYPICAL CHARACTERISTICS
OP27
MAXIMUM PEAK-TO-PEAK
OUTPUT VOLTAGE
vs
FREQUENCY
28
V
CC
=
15 V
R = 1 kΩ
L
24
20
16
12
8
T
= 25°C
A
4
0
1 k
10 k
100 k
1 M
10 M
f − Frequency − Hz
Figure 8.
OP27A
OP27A
LARGE-SIGNAL
LARGE-SIGNAL
DIFFERENTIAL VOLTAGE AMPLIFICATION
DIFFERENTIAL VOLTAGE AMPLIFICATION
vs
vs
TOTAL SUPPLY VOLTAGE
LOAD RESISTANCE
2500
2000
1500
2400
2200
2000
1800
1600
1400
V
T
=
10 V
V
V
T
=
15 V
10 V
= 25°C
O
CC
= 25°C
=
A
O
A
R
= 2 kΩ
L
R
= 1 kΩ
L
1000
500
0
1200
1000
800
600
400
1
10
0
10
20
30
40
50
0.1
100
V
CC+
− V
− Total Supply Voltage − V
R − Load Resistance − kΩ
L
CC −
Figure 9
Figure 10
9
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
OP27A, OP27C
LOW-NOISE HIGH-SPEED PRECISION OPERATIONAL-AMPLIFIER
SLOS100E − FEBRUARY 1989 − REVISED FEBRUARY 2010
TYPICAL CHARACTERISTICS
OP27
LARGE-SIGNAL DIFFERENTIAL
VOLTAGE AMPLIFICATION AND PHASE SHIFT
vs
FREQUENCY
25
20
80°
V
=
15 V
CC
R = 1 kΩ
T
A
L
100°
120°
140°
160°
180°
200°
220°
= 25°C
15
Phase Shift
φ
= 70°
10
m
5
0
A
VD
− 5
− 10
1
10
100
f − Frequency − Hz
Figure 11.
OP27A
LARGE-SIGNAL
OP27A
DIFFERENTIAL VOLTAGE AMPLIFICATION
COMMON-MODE REJECTION RATIO
vs
vs
FREQUENCY
FREQUENCY
140
120
100
80
140
120
100
80
V
V
T
=
15 V
10 V
= 25°C
CC
V
=
15 V
CC
=
IC
R = 2 kΩ
T
A
L
A
= 25°C
60
40
OP27A
OP27A
100 k
20
60
0
−20
40
1 k
10 k
1 M
10 M
0.1
1
10 100 1 k 10 k
1 M
100 M
f − Frequency − Hz
f − Frenquency − Hz
Figure 12
Figure 13
10
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
OP27A, OP27C
LOW-NOISE HIGH-SPEED PRECISION OPERATIONAL-AMPLIFIER
SLOS100E − FEBRUARY 1989 − REVISED FEBRUARY 2010
TYPICAL CHARACTERISTICS
SUPPLY VOLTAGE REJECTION RATIO
SLEW RATE
vs
vs
FREQUENCY
FREE-AIR TEMPERATURE
160
140
120
100
80
6
4
V
R
=
15 V
CC
V
T
=
4 V to 18 V
CC
≥ 2 kΩ
L
= 25°C
A
Negative
Supply
OP27
(A ≥ 1)
VD
60
2
0
40
Positive
Supply
20
0
1
10
100 1 k 10 k 100 k 1 M 10 M 100 M
f − Frequency − Hz
− 50 − 25
0
25
50
75
100
125
T
A
− Free Air Temperature − °C
Figure 14
Figure 15
OP27
PHASE MARGIN AND
GAIN-BANDWIDTH PRODUCT
vs
FREE-AIR TEMPERATURE
85°
80°
11
V
CC
= 15 V
10.6
10.2
9.8
9.4
9
75°
70°
φ
m
65°
60°
55°
50°
8.6
8.2
7.8
7.4
7
GBW (f = 100 kHz)
45°
40°
35°
− 75 − 50 − 25
0
25
50
75
100 125
T
A
− Free-Air Temperature − °C
Figure 16.
11
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
OP27A, OP27C
LOW-NOISE HIGH-SPEED PRECISION OPERATIONAL-AMPLIFIER
SLOS100E − FEBRUARY 1989 − REVISED FEBRUARY 2010
TYPICAL CHARACTERISTICS
EQUIVALENT INPUT NOISE VOLTAGE
TOTAL EQUIVALENT INPUT NOISE VOLTAGE
vs
vs
BANDWIDTH
SOURCE RESISTANCE
100
10
1
10
V
= 15 V
= 20 Ω
= 25°C
R1
V
=
15 V
BW = 1 Hz
= 25°C
CC
CC
−
+
R
T
S
T
A
A
R2
R
= R1 + R2
S
1
f = 10 Hz
f = 1 kHz
0.1
Resistor Noise Only
0.01
1 k
10 k
100
0.1
1
10
100
R
− Source Resistance − Ω
Bandwidth − kHz
(0.1 Hz to frequency indicated)
S
Figure 17
Figure 18
OP27A
OP27A
EQUIVALENT INPUT NOISE VOLTAGE
EQUIVALENT INPUT NOISE VOLTAGE
vs
vs
TOTAL SUPPLY VOLTAGE
FREE-AIR TEMPERATURE
20
5
4
3
2
R
= 20 Ω
V
R
=
15 V
S
CC
BW = 1 Hz
= 25°C
= 20 Ω
S
T
BW = 1 Hz
A
f = 10 Hz
f = 1 kHz
15
10
5
f = 10 Hz
f = 1 kHz
0
1
0
10
− V
20
30
40
− 50 − 25
0
25
50
75
100
125
V
CC+
− Total Supply Voltage − V
T
A
− Free-Air Temperature − °C
CC−
Figure 19
Figure 20
12
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
OP27A, OP27C
LOW-NOISE HIGH-SPEED PRECISION OPERATIONAL-AMPLIFIER
SLOS100E − FEBRUARY 1989 − REVISED FEBRUARY 2010
TYPICAL CHARACTERISTICS
OP27A
EQUIVALENT INPUT NOISE VOLTAGE
vs
FREQUENCY
10
9
8
7
V
R
=
15 V
CC
= 20 Ω
S
BW = 1 Hz
= 25°C
T
A
6
5
4
3
1/f Corner = 2.7 Hz
2
1
1
10
100
1000
f − Frequency − Hz
Figure 21
SHORT-CIRCUIT OUTPUT CURRENT
SUPPLY CURRENT
vs
vs
ELAPSED TIME
TOTAL SUPPLY VOLTAGE
60
50
40
30
20
10
5
V
T
=
15 V
CC
= 25°C
A
4
3
2
1
T
= 125°C
A
I
I
OS−
OS+
T
= 25°C
A
T
= − 55°C
A
0
1
2
3
4
5
5
15
− V
25
35
45
t − Time − minutes
V
CC+
− Total Supply Voltage − V
CC−
Figure 22
Figure 23
13
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
OP27A, OP27C
LOW-NOISE HIGH-SPEED PRECISION OPERATIONAL-AMPLIFIER
SLOS100E − FEBRUARY 1989 − REVISED FEBRUARY 2010
TYPICAL CHARACTERISTICS
OP27
OP27
VOLTAGE FOLLOWER
SMALL-SIGNAL
VOLTAGE FOLLOWER
LARGE-SIGNAL
PULSE RESPONSE
PULSE RESPONSE
80
60
8
6
40
4
20
2
0
0
− 20
− 40
− 60
− 80
− 2
− 4
− 6
− 8
V
=
15 V
CC
V
=
15 V
CC
A = 1
V
A = − 1
V
C = 15 pF
T
A
L
T
A
= 25°C
= 25°C
0
0.5
1
1.5
2
2.5
3
0
2
4
6
8
10
12
t − Time − μs
t − Time − μs
Figure 24
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
POST OFFICE BOX 655303 • 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.
100
90
80
70
60
50
40
30
0.01
0.1
1
10
100
f − Frequency − Hz
0.1 μF
100 kΩ
10 Ω
LT1001
+
2 kΩ
22 μF
−
+
4.3 kΩ
2.2 μF
Oscilloscope
−
R
= 1 MΩ
Voltage
Gain = 50,000
in
100 kΩ
OP27
Device
Under
Test
110 kΩ
4.7 μF
24.3 kΩ
0.1 μF
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
15
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
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
2
2 1/2
−
+
[V
no
− (130 nV) ]
V
no
I =
n
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 V is necessary, using a 10-kΩ nulling potentiometer as shown in
IO
Figure 28 does not degrade the temperature coefficient α . Trimming to a value other than zero creates an
VIO
α
VIO
of V /300 μV/°C. For example, if V is adjusted to 300 μV, the change in α
is 1 μV/°C.
IO
IO
VIO
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
15 V
1
2
3
8
4.7 kΩ
−
+
7
6
Input
Output
1
2
3
8
4
4
7
6
Input
Output
−15 V
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 ∝V of the
IO
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 • DALLAS, TEXAS 75265
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
A
VD
= 100.
R1
50 kΩ
15 V
7
2
3
−
+
6
R2
100 Ω
V
O
= 1000 V
IO
4
R3
50 kΩ
−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 R ≤ 100 Ω and the input is driven with a fast large-signal pulse (>1 V),
f
is shown in the pulsed-operation diagram in Figure 31.
R
f
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 R ≥ 500 Ω, the output is capable of handling the current requirements (load
f
current ≤20 mA at 10 V), the amplifier stays in its active mode, and a smooth transition occurs. When
R > 2 kΩ, a pole is created with R and the amplifier’s input capacitance, creating additional phase shift and
f
f
reducing the phase margin. A small capacitor (20 pF to 50 pF) in parallel with R eliminates this problem.
f
17
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
OP27A, OP27C
LOW-NOISE HIGH-SPEED PRECISION OPERATIONAL-AMPLIFIER
SLOS100E − FEBRUARY 1989 − REVISED FEBRUARY 2010
APPLICATION INFORMATION
unity gain buffer applications (continued)
120
100
80
60
40
20
0
0
2
4
6
8
10
t − Time − seconds
Type S Thermocouples
5.4 μV/°C at 0°C
+
#1
Cold-Junction
Circuitry
−
+
To Gate
Drive
−
+
A
VD
= 10,000
#2
−
+
Output
100 kΩ
OP27
−
Typical
Multiplexing
0.05 μF
FET Switches
+
#24
−
High-Quality
Single-Point Ground
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
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
PACKAGE OPTION ADDENDUM
www.ti.com
25-Jan-2012
PACKAGING INFORMATION
Status (1)
Eco Plan (2)
MSL Peak Temp (3)
Samples
Orderable Device
Package Type Package
Drawing
Pins
Package Qty
Lead/
Ball Finish
(Requires Login)
JM38510/13506BPA
M38510/13506BPA
OP27AFKB
ACTIVE
ACTIVE
ACTIVE
ACTIVE
ACTIVE
CDIP
CDIP
LCCC
CDIP
CDIP
JG
JG
FK
JG
JG
8
8
1
1
1
1
1
TBD
TBD
TBD
TBD
TBD
A42
A42
N / A for Pkg Type
N / A for Pkg Type
20
8
POST-PLATE N / A for Pkg Type
OP27AJGB
A42
A42
N / A for Pkg Type
N / A for Pkg Type
OP27CJGB
8
(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) Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS), Pb-Free (RoHS Exempt), or Green (RoHS & no Sb/Br) - please check http://www.ti.com/productcontent for the latest availability
information and additional product content details.
TBD: The Pb-Free/Green conversion plan has not been defined.
Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements for all 6 substances, including the requirement that
lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes.
Pb-Free (RoHS Exempt): This component has a RoHS exemption for either 1) lead-based flip-chip solder bumps used between the die and package, or 2) lead-based die adhesive used between
the die and leadframe. The component is otherwise considered Pb-Free (RoHS compatible) as defined above.
Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame retardants (Br or Sb do not exceed 0.1% by weight
in homogeneous material)
(3) MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature.
Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. TI bases its knowledge and belief on information
provided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and
continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals.
TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited information may not be available for release.
In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI to Customer on an annual basis.
Addendum-Page 1
MECHANICAL DATA
MCER001A – JANUARY 1995 – REVISED JANUARY 1997
JG (R-GDIP-T8)
CERAMIC DUAL-IN-LINE
0.400 (10,16)
0.355 (9,00)
8
5
0.280 (7,11)
0.245 (6,22)
1
4
0.065 (1,65)
0.045 (1,14)
0.310 (7,87)
0.290 (7,37)
0.063 (1,60)
0.015 (0,38)
0.020 (0,51) MIN
0.200 (5,08) MAX
0.130 (3,30) MIN
Seating Plane
0.023 (0,58)
0.015 (0,38)
0°–15°
0.100 (2,54)
0.014 (0,36)
0.008 (0,20)
4040107/C 08/96
NOTES: A. All linear dimensions are in inches (millimeters).
B. This drawing is subject to change without notice.
C. This package can be hermetically sealed with a ceramic lid using glass frit.
D. Index point is provided on cap for terminal identification.
E. Falls within MIL STD 1835 GDIP1-T8
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
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