AD AMP01AX Low noise, precision instrumentation amplifier Datasheet

AC performance complements the superb dc specifications. The
AMP01 slews at 4.5 V/µs into capacitive loads of up to 15 nF,
settles in 50 µs to 0.01% at a gain of 1000, and boasts a healthy
26 MHz gain-bandwidth product. These features make the
AMP01 ideal for high speed data acquisition systems.
Gain is set by the ratio of two external resistors over a range of
0.1 to 10,000. A very low gain temperature coefficient of
10 ppm/°C is achievable over the whole gain range. Output
voltage swing is guaranteed with three load resistances; 50 Ω,
500 Ω, and 2 kΩ. Loaded with 500 Ω, the output delivers
± 13.0 V minimum. A thermal shutdown circuit prevents destruction of the output transistors during overload conditions.
The AMP01 can also be configured as a high performance operational amplifier. In many applications, the AMP01 can be
used in place of op amp/power-buffer combinations.
REV. D
Information furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assumed by Analog Devices for its
use, nor for any infringements of patents or other rights of third parties
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
18
17
VIOS NULL
–IN 3
16
VIOS NULL
+IN
VOOS NULL 4
15
RS
VOOS NULL 5
14
RS
TEST PIN* 6
13
+VOP
SENSE 7
12
V+
REFERENCE 8
11
V–
OUTPUT 9
10
–VOP
AMP01
TOP VIEW
(Not to Scale)
*MAKE NO ELECTRICAL CONNECTION
NC
+IN
4
3
2
1
28 27 26
NC
RG
VIOS NULL
AMP01 BTC/883
28-Terminal LCC
NC 5
25
VIOS NULL
VOOS NULL 6
24
NC
NC 7
23
RS
22
RS
AMP01
VOOS NULL 8
TOP VIEW
(Not to Scale)
NC 9
21
+VOP
TEST PIN* 10
20
NC
NC 11
19
V+
V–
NC
–VOP
NC
12 13 14 15 16 17 18
NC = NO CONNECT
OUT
Input offset voltage is very low (20 µV), which generally eliminates the external null potentiometer. Temperature changes
have minimal effect on offset; TCVIOS is typically 0.15 µV/°C.
Excellent low-frequency noise performance is achieved with a
minimal compromise on input protection. Bias current is very
low, less than 10 nA over the military temperature range. High
common-mode rejection of 130 dB, 16-bit linearity at a gain of
1000, and 50 mA peak output current are achievable simultaneously. This combination takes the instrumentation amplifier
one step further towards the ideal amplifier.
RG 1
RG 2
–IN
The AMP01 is a monolithic instrumentation amplifier designed
for high-precision data acquisition and instrumentation applications. The design combines the conventional features of an
instrumentation amplifier with a high current output stage. The
output remains stable with high capacitance loads (1 µF), a
unique ability for an instrumentation amplifier. Consequently,
the AMP01 can amplify low level signals for transmission
through long cables without requiring an output buffer. The output
stage may be configured as a voltage or current generator.
18-Lead Cerdip
RG
GENERAL DESCRIPTION
PIN CONFIGURATIONS
REF
FEATURES
Low Offset Voltage: 50 ␮V Max
Very Low Offset Voltage Drift: 0.3 ␮V/ⴗC Max
Low Noise: 0.12 ␮V p-p (0.1 Hz to 10 Hz)
Excellent Output Drive: ⴞ10 V at ⴞ50 mA
Capacitive Load Stability: to 1 ␮F
Gain Range: 0.1 to 10,000
Excellent Linearity: 16-Bit at G = 1000
High CMR: 125 dB min (G = 1000)
Low Bias Current: 4 nA Max
May Be Configured as a Precision Op Amp
Output-Stage Thermal Shutdown
Available in Die Form
SENSE
a
Low Noise, Precision
Instrumentation Amplifier
AMP01*
*MAKE NO ELECTRICAL CONNECTION
20-Lead SOIC
RG
1
20
RG
TEST PIN*
2
19
TEST PIN*
–IN
3
18
+IN
VOOS NULL
4
17
VIOS NULL
VOOS NULL
5
16
VIOS NULL
TEST PIN*
6
SENSE
AMP01
TOP VIEW 15 R
S
(Not to Scale)
14 RS
7
REFERENCE
8
13
+VOP
OUTPUT
9
12
V+
11
V–
–VOP 10
*MAKE NO ELECTRICAL CONNECTION
*Protected under U.S. Patent Numbers 4,471,321 and 4,503,381.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
World Wide Web Site: http://www.analog.com
Fax: 781/326-8703
© Analog Devices, Inc., 1999
AMP01–SPECIFICATIONS
ELECTRICAL CHARACTERISTICS (@ V = ⴞ15 V, R = 10 k⍀, R = 2 k⍀, T = +25ⴗC, unless otherwise noted)
S
S
Parameter
Symbol
Conditions
OFFSET VOLTAGE
Input Offset Voltage
VIOS
TA = +25°C
–55°C ≤ TA ≤ +125°C
–55°C ≤ TA ≤ +125°C
TA = +25°C
–55°C ≤ TA ≤ +125°C
RG = ∞
–55°C ≤ TA ≤ +125°C
G = 1000
G = 100
G = 10
G=1
Input Offset Voltage Drift
Output Offset Voltage
TCVIOS
VOOS
Output Offset Voltage Drift
TCVOOS
Offset Referred to Input
vs. Positive Supply
V+ = +5 V to +15 V
PSR
Offset Referred to Input
vs. Negative Supply
V– = –5 V to –15 V
PSR
Input Offset Voltage Trim
Range
Output Offset Voltage Trim
Range
INPUT CURRENT
Input Bias Current
IB
Input Bias Current Drift
Input Offset Current
TCIB
IOS
Input Offset Current Drift
TCIOS
INPUT
Input Resistance
RIN
Input Voltage Range
IVR
Common-Mode Rejection
CMR
L
Min
A
AMP01A
Typ Max
AMP01B
Min Typ Max
Units
40
60
0.3
2
6
100
150
1.0
6
10
µV
µV
µV/°C
mV
mV
50
120
120
100
80
120
110
100
90
70
µV/°C
dB
dB
dB
dB
130
130
110
90
125
105
85
65
110
100
90
70
105
90
70
50
120
120
100
80
115
95
75
60
dB
dB
dB
dB
dB
dB
dB
dB
125
105
85
85
105
90
70
50
115
95
75
60
dB
dB
dB
dB
20
40
0.15
1
3
50
80
0.3
3
6
20
130
130
110
90
50
120
110
95
75
–55°C ≤ TA ≤ +125°C
G = 1000
G = 100
G = 10
G=1
G = 1000
G = 100
G = 10
G=1
120
110
95
75
105
90
70
50
–55°C ≤ TA ≤ +125°C
G = 1000
G = 100
G = 10
G=1
105
90
70
50
VS = ± 4.5 V to ± 18 V 1
±6
±6
mV
VS = ± 4.5 V to ± 18 V 1
± 100
± 100
mV
TA = +25°C
–55°C ≤ TA ≤ +125°C
–55°C ≤ TA ≤ +125°C
TA = +25°C
–55°C ≤ TA ≤ +125°C
–55°C ≤ TA ≤ +125°C
1
4
40
0.2
0.5
3
Differential, G = 1000
Differential, G ≤ 100
Common Mode, G = 1000
TA = +25°C2
–55°C ≤ TA ≤ +125°C
VCM = ± 10 V, 1 kΩ
Source Imbalance
G = 1000
G = 100
G = 10
G=1
1
10
20
–55°C ≤ TA ≤ +125°C
G = 1000
G = 100
G = 10
G=1
± 10.5
± 10.0
4
10
2
6
50
0.5
1.0
5
1.0
3.0
± 10.5
± 10.0
6
15
2.0
6.0
nA
nA
pA/°C
nA
nA
pA/°C
1
10
20
GΩ
GΩ
GΩ
V
V
125
120
100
85
130
130
120
100
115
110
95
75
125
125
110
90
dB
dB
dB
dB
120
115
95
80
125
125
115
95
110
105
90
75
120
120
105
90
dB
dB
dB
dB
NOTES
1
VIOS and V OOS nulling has minimal affect on TCV IOS and TCV OOS respectively.
2
Refer to section on common-mode rejection.
Specifications subject to change without notice.
–2–
REV. D
AMP01
(@ VS = ⴞ15 V, RS = 10 k⍀, RL = 2 k⍀, TA = +25ⴗC, –25ⴗC ≤ TA ≤ +85ⴗC for E, F
ELECTRICAL CHARACTERISTICS grades, 0ⴗC ≤ T ≤ +70ⴗC for G grade, unless otherwise noted)
A
Parameter
OFFSET VOLTAGE
Input Offset Voltage
Symbol
Conditions
VIOS
TA = +25°C
TMIN ≤ TA ≤ TMAX
TMIN ≤ TA ≤ TMAX1
TA = +25°C
TMIN ≤ TA ≤ TMAX
R G = ∞1
TMIN ≤ TA ≤ TMAX
G = 1000
G = 100
G = 10
G=1
Input Offset Voltage Drift
Output Offset Voltage
TCVIOS
VOOS
Output Offset Voltage Drift
TCVOOS
Offset Referred to Input
vs. Positive Supply
V+ = +5 V to +15 V
PSR
Offset Referred to Input
vs. Negative Supply
V– = –5 V to –15 V
Input Offset Voltage Trim
Range
Output Offset Voltage Trim
Range
INPUT CURRENT
Input Bias Current
PSR
IB
Input Bias Current Drift
Input Offset Current
TCIB
IOS
Input Offset Current Drift
TCIOS
INPUT
Input Resistance
RIN
Input Voltage Range
IVR
Common-Mode Rejection
CMR
Min
AMP01F/G
Min Typ Max
Units
40
60
0.3
2
6
100
150
1.0
6
10
µV
µV
µV/°C
mV
mV
50
120
120
100
80
120
110
100
90
70
µV/°C
dB
dB
dB
dB
130
130
110
90
125
105
85
65
110
100
90
70
105
90
70
50
120
120
100
80
115
95
75
60
dB
dB
dB
dB
dB
dB
dB
dB
125
105
85
85
105
90
70
50
115
95
75
60
dB
dB
dB
dB
20
40
0.15
1
3
50
80
0.3
3
6
20
130
130
110
90
100
120
110
95
75
TMIN ≤ TA ≤ TMAX
G = 1000
G = 100
G = 10
G=1
G = 1000
G = 100
G = 10
G=1
120
110
95
75
110
95
75
55
TMIN ≤ TA ≤ TMAX
G = 1000
G = 100
G = 10
G=1
110
95
75
55
VS = ± 4.5 V to ± 18 V 2
±6
±6
mV
VS = ± 4.5 V to ± 18 V 2
± 100
± 100
mV
TA = +25°C
TMIN ≤ TA ≤ TMAX
TMIN ≤ TA ≤ TMAX
TA = +25°C
TMIN ≤ TA ≤ TMAX
TMIN ≤ TA ≤ TMAX
1
4
40
0.2
0.5
3
Differential, G = 1000
Differential, G ≤ 100
Common Mode, G = 1000
TA = +25°C3
TMIN ≤ TA ≤ TMAX
VCM = ± 10 V, 1 kΩ
Source Imbalance
G = 1000
G = 100
G = 10
G=1
1
10
20
TMIN ≤ TA ≤ TMAX
G = 1000
G = 100
G = 10
G=1
NOTES
1
Sample tested.
2
VIOS and V OOS nulling has minimal affect on TCVIOS and TCVOOS , respectively.
3
Refer to section on common-mode rejection.
Specifications subject to change without notice.
REV. D
AMP01E
Typ Max
–3–
± 10.5
± 10.0
4
10
2
6
50
0.5
1.0
5
1.0
3.0
± 10.5
± 10.0
6
15
2.0
6.0
mV
mV
pA/°C
mV
mV
pA/°C
1
10
20
GΩ
GΩ
GΩ
V
V
125
120
100
85
130
130
120
100
115
110
95
75
125
125
110
90
dB
dB
dB
dB
120
115
95
80
125
125
115
95
110
105
90
75
120
120
105
90
dB
dB
dB
dB
AMP01
ELECTRICAL CHARACTERISTICS (@ V = ⴞ15 V, R = 10 k⍀, R = 2 k⍀, T = +25ⴗC, unless otherwise noted)
S
Parameter
S
Symbol Conditions
L
Min
A
AMP01A/E
Typ Max
Min
AMP01B/F/G
Typ Max
Units
GAIN
Gain Equation Accuracy
G=
20 × RS
RG
0.3
0.6
0.5
0.8
%
Accuracy Measured
from G = 1 to 1000
Gain Range
Nonlinearity
G
Temperature Coefficient
GTC
OUTPUT RATING
Output Voltage Swing
VOUT
Positive Current Limit
Negative Current Limit
Capacitive Load Stability
Thermal Shutdown
Temperature
NOISE
Voltage Density, RTI
Noise Current Density, RTI
Input Noise Voltage
Input Noise Current
DYNAMIC RESPONSE
Small-Signal
Bandwidth (–3 dB)
Slew Rate
Settling Time
0.1
10k
0.0007 0.005
0.005
0.005
0.010
5
10
0.1
10k
0.0007 0.005
0.005
0.007
0.015
5
15
V/V
%
%
%
%
ppm°C
± 13.0
± 13.0
± 2.5
± 12.0
± 12.0
60
60
± 13.8
± 13.5
± 4.0
± 13.8
± 13.5
100
120
90
120
± 13.0
± 13.0
± 2.5
± 12.0
± 12.0
60
60
± 13.8
± 13.5
± 4.0
± 13.8
± 13.5
100
120
90
120
V
V
V
V
V
mA
mA
0.1
1
0.1
1
µF
165
165
°C
5
10
59
540
0.15
5
10
59
540
0.15
nV/√Hz
nV/√Hz
nV/√Hz
nV/√Hz
pA/√Hz
0.12
0.16
1.4
13
2
0.12
0.16
1.4
13
2
µV p-p
µV p-p
µV p-p
µV p-p
pA p-p
570
100
82
26
4.5
570
100
82
26
4.5
kHz
kHz
kHz
kHz
V/µs
12
13
15
50
µs
µs
µs
µs
G = 10001
G = 1001
G = 101
G = 11
1 ≤ G ≤ 10001, 2
RL = 2 kΩ
RL = 500 Ω
RL = 50 Ω
RL = 2 kΩ Over Temp.
RL = 500 Ω3
Output-to-Ground Short
Output-to-Ground Short
1 ≤ G ≤ 1000
No Oscillations1
Junction Temperature
en
en
en
en
en
in
en p-p
en p-p
en p-p
en p-p
en p-p
in p-p
BW
SR
tS
fO = 1 kHz
G = 1000
G = 100
G = 10
G=1
fO = 1 kHz, G = 1000
0.1 Hz to 10 Hz
G = 1000
G = 100
G = 10
G=1
0.1 Hz to 10 Hz, G = 1000
G=1
G = 10
G = 100
G = 1000
G = 10
To 0.01%, 20 V step
G=1
G = 10
G = 100
G = 1000
3.5
12
13
15
50
3.0
NOTES
1
Guaranteed by design.
2
Gain tempco does not include the effects of gain and scale resistor tempco match.
3
–55°C ≤ TA ≤ +125°C for A/B grades, –25°C ≤ TA ≤ +85°C for E/F grades, 0°C ≤ TA ≤ 70°C for G grades.
Specifications subject to change without notice.
–4–
REV. D
AMP01
ELECTRICAL CHARACTERISTICS (@ V = ⴞ15 V, R = 10 k⍀, R = 2 k⍀, T = +25ⴗC, unless otherwise noted)
S
Parameter
Symbol Conditions
SENSE INPUT
Input Resistance
Input Current
Voltage Range
RIN
IIN
REFERENCE INPUT
Input Resistance
Input Current
Voltage Range
Gain to Output
RIN
IIN
S
L
Referenced to V–
(Note 1)
A
AMP01A/E
Min Typ Max
AMP01B/F/G
Min Typ Max
35
65
35
+15
–10.5
65
35
+15
–10.5
50
280
–10.5
35
Referenced to V–
(Note 1)
50
280
–10.5
50
280
+15
50
280
1
65
65
+15
1
POWER SUPPLY –25°C ≤ TA ≤ +85°C for E/F Grades, –55°C ≤ TA ≤ +125°C for A/B Grades
+V linked to +VOP
± 4.5
± 18
Supply Voltage Range
VS
–V linked to –VOP
± 4.5
± 18
VS
+V linked to +VOP
3.0
4.8
Quiescent Current
IQ
IQ
–V linked to –VOP
3.4
4.8
± 4.5
± 4.5
3.0
3.4
± 18
± 18
4.8
4.8
NOTE
1
Guaranteed by design.
Specifications subject to change without notice.
ORDERING GUIDE
Model
Temperature Range Package Description Package Option
AMP01AX
AMP01AX/883C
AMP01BTC/883C
AMP01BX
AMP01BX/883C
AMP01EX
AMP01FX
AMP01GBC
AMP01GS
AMP01GS-REEL
AMP01NBC
–55°C to +125°C
–55°C to +125°C
–55°C to +125°C
–55°C to +125°C
–55°C to +125°C
–25°C to +85°C
–25°C to +85°C
0°C to +70°C
0°C to +70°C
5962-8863001VA* –55°C to +125°C
5962-88630023A* –55°C to +125°C
5962-8863002VA* –55°C to +125°C
18-Lead Cerdip
18-Lead Cerdip
28-Terminal LCC
18-Lead Cerdip
18-Lead Cerdip
18-Lead Cerdip
18-Lead Cerdip
Die
20-Lead SOIC
13" Tape and Reel
Die
Q-18
Q-18
E-28A
Q-18
Q-18
Q-18
Q-18
18-Lead Cerdip
28-Terminal LCC
18-Lead Cerdip
Q-18
E-28A
Q-18
R-20
R-20
*Standard military drawing available.
DICE CHARACTERISTICS
Die Size 0.111 × 0.149 inch, 16,539 sq. mils
(2.82 × 3.78 mm, 10.67 sq. mm)
1.
2.
3.
4.
5.
6.
7.
8.
9.
RG
RG
–INPUT
VOOS NULL
VOOS NULL
TEST PIN*
SENSE
REFERENCE
OUTPUT
10.
11.
12.
13.
14.
15.
16.
17.
18.
V– (OUTPUT)
V–
V+
V+ (OUTPUT)
RS
RS
VIOS NULL
VIOS NULL
+INPUT
* MAKE NO ELECTRICAL CONNECTION
REV. D
–5–
Units
kΩ
µA
V
kΩ
µA
V
V/V
V
V
mA
mA
AMP01
WAFER TEST LIMITS (@ V = ⴞ15 V, R = 10 k⍀, R = 2 k⍀, T = +25ⴗC, unless otherwise noted)
S
S
L
Parameter
Symbol Conditions
Input Offset Voltage
Output Offset Voltage
Offset Referred to Input
vs. Positive Supply
VIOS
VOOS
PSR
Offset Referred to Input
vs. Negative Supply
PSR
Input Bias Current
Input Offset Current
Input Voltage Range
Common Mode Rejection
IB
IOS
IVR
CMR
Gain Equation Accuracy
Output Voltage Swing
Output Current Limit
Output Current Limit
Quiescent Current
IQ
AMP01NBC
Limit
V+ = +5 V to +15 V
G = 1000
G = 100
G = 10
G=1
V– = –5 V to –15 V
G = 1000
G = 100
G = 10
G=1
Guaranteed by CMR Tests
VCM = ± 10 V
G = 1000
G = 100
G = 10
G=1
G=
VOUT
VOUT
VOUT
A
20 × RS
RG
RL = 2 kΩ
RL = 500 Ω
RL = 50 Ω
Output to Ground Short
Output to Ground Short
+V Linked to +VOP
–V Linked to –VOP
AMP01GBC
Limit
Units
60
4
120
8
120
110
95
75
110
100
90
70
105
90
70
50
4
1
± 10
105
90
70
50
8
3
± 10
125
120
100
85
115
110
95
75
µV max
mV max
dB min
dB min
dB min
dB min
dB min
dB min
dB min
dB min
dB min
dB min
nA max
nA max
V min
dB min
dB min
dB min
dB min
dB min
0.6
0.8
% max
± 13
± 13
± 2.5
± 60
± 120
4.8
4.8
± 13
± 13
± 2.5
± 60
± 120
4.8
4.8
V min
V min
V min
mA min
mA max
mA max
mA max
NOTE
Electrical tests are performed at wafer probe to the limits shown. Due to variations in assembly methods and normal yield loss, yield after packaging is not guaranteed
for standard product dice. Consult factory to negotiate specifications based on dice lot qualification through sample lot assembly and testing.
V+
VIOS
NULL
+VOP
A1
OUTPUT
250V
–VOP
–IN
+IN
250V
Q1
Q2
REFERENCE
R1
47.5kV
R3
47.5kV
RGAIN
A2
SENSE
A3
RSCALE
R2
2.5kV
VOOS
NULL
R4
2.5kV
V–
Figure 1. Simplified Schematic
CAUTION
ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily
accumulate on the human body and test equipment and can discharge without detection.
Although the AMP01 features proprietary ESD protection circuitry, permanent damage may
occur on devices subjected to high energy electrostatic discharges. Therefore, proper ESD
precautions are recommended to avoid performance degradation or loss of functionality.
–6–
WARNING!
ESD SENSITIVE DEVICE
REV. D
AMP01
ELECTRICAL CHARACTERISTICS (@ V = ⴞ15 V, R = 10 k⍀, R = 2 k⍀, T = +25ⴗC, unless otherwise noted)
S
Parameter
Symbol
Input Offset Voltage Drift
Output Offset Voltage Drift
Input Bias Current Drift
Input Offset Current Drift
Nonlinearity
Voltage Noise Density
TCVIOS
TCVOOS
TCIB
TCIOS
en
Current Noise Density
in
Voltage Noise
en p-p
Current Noise
in p-p
Small-Signal Bandwidth (–3 dB) BW
Slew Rate
SR
Settling Time
tS
S
L
A
AMP01NBC
Typical
Conditions
RG = ∞
G = 1000
G = 1000
fO = 1 kHz
G = 1000
fO = 1 kHz
G = 1000
0.1 Hz to 10 Hz
G = 1000
0.1 Hz to 10 Hz
G = 1000
G = 10
To 0.01%, 20 V Step
G = 1000
AMP01GBC
Typical
Units
0.15
20
40
3
0.0007
0.30
50
50
5
0.0007
µV/°C
µV/°C
pA/°C
pA/°C
%
5
5
nV/√Hz
0.15
0.15
pA/√Hz
0.12
2
0.12
2
µV p-p
pA p-p
26
4.5
26
4.5
kHz
V/µs
50
50
µs
NOTE
Electrical tests are performed at wafer probe to the limits shown. Due to variations in assembly methods and normal yield loss, yield after packaging is not guaranteed
for standard product dice. Consult factory to negotiate specifications based on dice lot qualification through sample lot assembly and testing.
REV. D
–7–
AMP01–Typical Performance Characteristics
8
50
30
20
10
0
–10
–20
–30
–40
–75 –50 –25
6
4
UNIT NO.
1
2
2
0
3
–2
4
–4
–6
0
25 50 75 100 125 150
TEMPERATURE – 8C
Figure 2. Input Offset Voltage
vs. Temperature
0
620
–0.5
65
610
615
620
625
POWER SUPPLY VOLTAGE – Volts
TA = +258C
3
2
1
0
–0.2
–0.4
–0.6
–75 –50 –25 0 25 50 75 100 125 150
TEMPERATURE – 8C
Figure 8. Input Offset Current
vs. Temperature
COMMON-MODE REJECTION – dB
0.0
0.5
0
–0.5
–1.0
–2
–75 –50 –25 0 25 50 75 100 125 150
TEMPERATURE – 8C
–1.5
0
65
610
615
POWER SUPPLY VOLTAGE – Volts
620
Figure 7. Input Bias Current
vs. Supply Voltage
140
140
0.2
1.0
–1
VS = 615V
0.4
–3
Figure 6. Input Bias Current
vs. Temperature
0.8
0.6
–2
1.5
VS = 615V
TA = +258C
G = 1000
COMMON-MODE REJECTION – dB
0
0
–1
2.0
INPUT BIAS CURRENT – nA
INPUT BIAS CURRENT – nA
0
1
Figure 4. Output Offset Voltage
vs. Temperature
4
2.0
0.5
2
VS = 615V
Figure 5. Output Offset Voltage
Change vs. Supply Voltage
INPUT OFFSET CURRENT – nA
65
610
615
POWER SUPPLY VOLTAGE – Volts
5
1.0
3
–4
TA = +258C
1.5
VS = 615V
4
–5
–75 –50 –25 0 25 50 75 100 125 150
TEMPERATURE – 8C
Figure 3. Input Offset Voltage
vs. Supply Voltage
2.5
–1.0
OUTPUT OFFSET VOLTAGE – mV
INPUT OFFSET VOLTAGE – mV
INPUT OFFSET VOLTAGE – mV
40
OUTPUT OFFSET VOLTAGE CHANGE – mV
5
TA = +258C
VS = 615V
130
120
110
120
G = 100
100
80
60
G = 10
40
G=1
VCM = 2V p-p
VS = 615V
TA = +258C
20
0
100
1
10
100
1k
VOLTAGE GAIN – G
10k
Figure 9. Common-Mode Rejection
vs. Voltage Gain
–8–
1
10
100
1k
FREQUENCY – Hz
10k
100k
Figure 10. Common-Mode Rejection
vs. Frequency
REV. D
140
VDM = 0
VS = 615V
14
12
10
VS = 610V
8
6
VS = 65V
4
2
120
100
G = 100
80
60
40
G = 10
20
1
100
G = 10
80
G=1
60
40
VS = 615V
TA = +258C
DVS = 61V
20
30
14
12
10
8
6
4
2
100
1k
LOAD RESISTANCE – V
G = 1000
60
G = 100
G = 10
20
G=1
0
–20
–40
1
10
100
1k
10k
FREQUENCY – Hz
100k
Figure 17. Closed-Loop Voltage
Gain vs. Frequency
REV. D
20
15
10
1M
1k
10k
100k
FREQUENCY – Hz
G = 1000
1.0
G=1
0.1
0.001
10
1M
100
1k
10k
100k
FREQUENCY – Hz
1M
Figure 16. Closed-Loop Output
Impedance vs. Frequency
0.02
VS = 615V
RL = 600V
VOUT = 20V p-p
0.06
0.05
G = 1000
0.04
0.03
G = 10
G = 100
0.02
G=1
0.01
0
10
10
0.01
5
0.07
100k
VS = 615V
IOUT = 20mA p-p
0.08
VS = 615V
TA = +258C
10k
100
VS = 615V
RL = 2kV
Figure 15. Maximum Output Swing
vs. Frequency
TOTAL HARMONIC DISTORTION – %
80
100
1k
FREQUENCY – Hz
10
Figure 13. Negative PSR
vs. Frequency
25
0
100
10k
Figure 14. Maximum Output Voltage
vs. Load Resistance
1
100k
10k
OUTPUT IMPEDANCE – V
PEAK-TO-PEAK AMPLITUDE – Volts
VS = 615V
40
100
1k
FREQUENCY – Hz
Figure 12. Positive PSR
vs. Frequency
16
10
10
100
1k
FREQUENCY – Hz
10k
Figure 18. Total Harmonic Distortion
vs. Frequency
–9–
TOTAL HARMONIC DISTORTION – %
18
OUITPUT VOLTAGE – Volts
G = 100
0
0
Figure 11. Common-Mode Voltage
Range vs. Temperature
VOLTAGE GAIN – dB
G = 1000
120
G=1
0
25 50 75 100 125 150
–75 –50 –25 0
TEMPERATURE – 8C
0
140
VS = 615V
TA = +258C
DVS = 61V
G = 1000
POWER SUPPLY REJECTION – dB
16
POWER SUPPLY REJECTION – dB
COMMON-MODE INPUT VOLTAGE – Volts
AMP01
VS = 615V
G = 100
f = 1kHz
VOUT = 20V p-p
0.01
0
100
1k
LOAD RESISTANCE – V
10k
Figure 19. Total Harmonic Distortion
vs. Load Resistance
AMP01
6
6
VS = 615V
5
4
3
2
1
4
3
2
1
0
1
10
100
VOLTAGE GAIN – G
Figure 20. Slew Rate vs.
Voltage Gain
10
100
1k
FREQUENCY – Hz
Figure 23. Voltage Noise Density
vs. Frequency
100
10
10
100
VOLTAGE GAIN – G
–5
–4
–3
–2
–1
0
65
620
610
615
POWER SUPPLY VOLTAGE – Volts
Figure 26. Negative Supply Current
vs. Supply Voltage
4
3
2
1
0
65
620
610
615
POWER SUPPLY VOLTAGE – Volts
–6
VS = 615V
NEGATIVE SUPPLY CURRENT – mA
–6
POSITIVE SUPPLY CURRENT – mA
–7
5
Figure 25. Positive Supply Current
vs. Supply Voltage
6
TA = +258C
6
1k
Figure 24. RTI Voltage Noise
Density vs. Gain
–8
7
0
1
1k
TA = +258C
1
10k
10
100
VOLTAGE GAIN – G
8
POSITIVE SUPPLY CURRENT – mA
VOLTAGE NOISE – nV/ Hz
VOLTAGE NOISE – nV/ Hz
0
1
NEGATIVE SUPPLY CURRENT – mA
1
Figure 22. Settling Time to 0.01%
vs. Voltage Gain
VS = 615V
f = 1kHz
5
30
1m
1k
G = 1000
10
40
10
1n
10n
100n
LOAD CAPACITANCE – F
Figure 21. Slew Rate vs.
Load Capacitance
15
50
20
0
100p
1k
VS = 615V
20V STEP
60
SETTLING TIME – ms
SLEW RATE – V/ms
SLEW RATE – V/ms
5
0
70
VS = 615V
5
4
3
2
1
0
–75 –50 –25
0
25 50 75 100 125 150
TEMPERATURE – 8C
Figure 27. Positive Supply Current
vs. Temperature
–10–
–5
VS = 615V
VSENSE = VREF = 0V
–4
–3
–2
–1
0
–75 –50 –25
0
25 50 75 100 125 150
TEMPERATURE – 8C
Figure 28. Negative Supply Current
vs. Temperature
REV. D
AMP01
INPUT AND OUTPUT OFFSET VOLTAGES
GAIN
Instrumentation amplifiers have independent offset voltages
associated with the input and output stages. While the initial
offsets may be adjusted to zero, temperature variations will
cause shifts in offsets. Systems with auto-zero can correct for
offset errors, so initial adjustment would be unnecessary. However, many high-gain applications don’t have auto zero. For
these applications, both offsets can be nulled, which has minimal effect on TCVIOS and TCVOOS
The AMP01 uses two external resistors for setting voltage gain
over the range 0.1 to 10,000. The magnitudes of the scale resistor, RS, and gain-set resistor, RG, are related by the formula:
G = 20 × RS/RG, where G is the selected voltage gain (refer to
Figure 29).
V+
RS
The input offset component is directly multiplied by the amplifier gain, whereas output offset is independent of gain. Therefore, at low gain, output-offset errors dominate, while at high
gain, input-offset errors dominate. Overall offset voltage, VOS,
referred to the output (RTO) is calculated as follows;
VOS (RTO) = (VIOS × G) + VOOS
14
–IN
TCVOS (RTO) = (TCV IOS × G) + TCVOOS
(2)
where TCVIOS is the input offset voltage drift, and TCVOOS is
the output offset voltage specification. Frequently, the amplifier
drift is referred back to the input (RTI), which is then equivalent to an input signal change;
TCVOS (RTI) = TCVIOS
TCV OOS
G
(3)
For example, the maximum input-referred drift of an AMP01 EX
set to G = 1000 becomes;
TCVOS (RTI ) = 0.3 µV/°C +
100 µV /°C
= 0.4 µV/°C max
1000
INPUT BIAS AND OFFSET CURRENTS
Input transistor bias currents are additional error sources that
can degrade the input signal. Bias currents flowing through the
signal source resistance appear as an additional offset voltage.
Equal source resistance on both inputs of an IA will minimize
offset changes due to bias current variations with signal voltage
and temperature. However, the difference between the two bias
currents, the input offset current, produces a nontrimmable
error. The magnitude of the error is the offset current times the
source resistance.
2
12
7
AMP01
3
VOLTAGE GAIN, G =
10
(20 R3 R )
S
9
8
11 REFERENCE
OUTPUT
V–
G
Figure 29. Basic AMP01 Connections for Gains
0.1 to 10,000
The magnitude of RS affects linearity and output referred errors.
Circuit performance is characterized using RS = 10 kΩ when
operating on ± 15 volt supplies and driving a ±10 volt output. RS
may be reduced to 5 kΩ in many applications particularly when
operating on ± 5 volt supplies or if the output voltage swing is
limited to ± 5 volts. Bandwidth is improved with RS = 5 kΩ and
this also increases common-mode rejection by approximately
6 dB at low gain. Lowering the value below 5 kΩ can cause
instability in some circuit configurations and usually has no
advantage. High voltage gains between two and ten thousand
would require very low values of RG. For RS = 10 kΩ and
AV = 2000 we get RG = 100 Ω; this value is the practical lower
limit for RG. Below 100 Ω, mismatch of wirebond and resistor
temperature coefficients will introduce significant gain tempco
errors. Therefore, for gains above 2,000, RG should be kept
constant at 100 Ω and RS increased. The maximum gain of
10,000 is obtained with RS set to 50 kΩ.
Metal-film or wirewound resistors are recommended for best
results. The absolute values and TCs are not too important,
only the ratiometric parameters.
AC amplifiers require good gain stability with temperature and
time, but dc performance is unimportant. Therefore, low cost
metal-film types with TCs of 50 ppm/°C are usually adequate
for RS and R G. Realizing the full potential of the AMP01’s offset
voltage and gain stability requires precision metal-film or wirewound resistors. Achieving a 15 ppm/°C gain tempco at all gains
requires RS and RG temperature coefficient matching to
5 ppm/°C or better.
A current path must always be provided between the differential
inputs and analog ground to ensure correct amplifier operation.
Floating inputs, such as thermocouples, should be grounded
close to the signal source for best common-mode rejection.
REV. D
SENSE
13
RG
where VIOS and VOOS are the input and output offset voltage
specifications and G is the amplifier gain. Input offset nulling
alone is recommended with amplifiers having fixed gain above
50. Output offset nulling alone is recommended when gain is
fixed at 50 or below.
The overall offset voltage drift TCVOS, referred to the output, is
a combination of input and output drift specifications. Input
offset voltage drift is multiplied by the amplifier gain, G, and
summed with the output offset drift;
15
1
(1)
In applications requiring both initial offsets to be nulled, the
input offset is nulled first by short-circuiting RG, then the output
offset is nulled with the short removed.
18
+IN
–11–
AMP01
IVR is the data sheet specification for input voltage range; VOUT
is the maximum output signal; G is the chosen voltage gain. For
example, at +25°C, IVR is specified as ± 10.5 volt minimum
with ± 15 volt supplies. Using a ± 10 volt maximum swing output and substituting the figures in (4) simplifies the formula to:
1M
VS = 615V
RESISTANCE – V
100k

5
CMVR = ± 10.5 – G
RS
10k
(5)
For all gains greater than or equal to 10, CMVR is ± 10 volt
minimum; at gains below 10, CMVR is reduced.
RG
1k
ACTIVE GUARD DRIVE
100
1
10
100
VOLTAGE GAIN
1k
10k
Figure 30. RG and RS Selection
Gain accuracy is determined by the ratio accuracy of RS and RG
combined with the gain equation error of the AMP01 (0.6%
max for A/E grades).
All instrumentation amplifiers require attention to layout so
thermocouple effects are minimized. Thermocouples formed
between copper and dissimilar metals can easily destroy the
TCVOS performance of the AMP01 which is typically
0.15 µV/°C. Resistors themselves can generate thermoelectric
EMF’s when mounted parallel to a thermal gradient. “Vishay”
resistors are recommended because a maximum value for thermoelectric generation is specified. However, where thermal
gradients are low and gain TCs of 20 ppm–50 ppm are sufficient, general-purpose metal-film resistors can be used for RG
and RS.
COMMON-MODE REJECTION
Ideally, an instrumentation amplifier responds only to the difference between the two input signals and rejects commonmode voltages and noise. In practice, there is a small change in
output voltage when both inputs experience the same commonmode voltage change; the ratio of these voltages is called the
common-mode gain. Common-mode rejection (CMR) is the
logarithm of the ratio of differential-mode gain to commonmode gain, expressed in dB. CMR specifications are normally
measured with a full-range input voltage change and a specified
source resistance unbalance.
The current-feedback design used in the AMP01 inherently
yields high common-mode rejection. Unlike resistive feedback
designs, typified by the three-op-amp IA, the CMR is not degraded by small resistances in series with the reference input. A
slight, but trimmable, output offset voltage change results from
resistance in series with the reference input.
The common-mode input voltage range, CMVR, for linear
operation may be calculated from the formula:

|V OUT|
CMVR = ±  IVR –
2 G 

Rejection of common-mode noise and line pick-up can be improved by using shielded cable between the signal source and
the IA. Shielding reduces pick-up, but increases input capacitance, which in turn degrades the settling-time for signal
changes. Further, any imbalance in the source resistance between the inverting and noninverting inputs, when capacitively
loaded, converts the common-mode voltage into a differential
voltage. This effect reduces the benefits of shielding. AC
common-mode rejection is improved by “bootstrapping” the
input cable capacitance to the input signal, a technique called
“guard driving.” This technique effectively reduces the input
capacitance. A single guard-driving signal is adequate at gains
above 100 and should be the average value of the two inputs.
The value of external gain resistor RG is split between two resistors RG1 and RG2; the center tap provides the required signal to
drive the buffer amplifier (Figure 31).
GROUNDING
The majority of instruments and data acquisition systems have
separate grounds for analog and digital signals. Analog ground
may also be divided into two or more grounds which will be tied
together at one point, usually the analog power-supply ground.
In addition, the digital and analog grounds may be joined, normally at the analog ground pin on the A-to-D converter. Following this basic grounding practice is essential for good circuit
performance (Figure 32).
Mixing grounds causes interactions between digital circuits and
the analog signals. Since the ground returns have finite resistance and inductance, hundreds of millivolts can be developed
between the system ground and the data acquisition components. Using separate ground returns minimizes the current flow
in the sensitive analog return path to the system ground point.
Consequently, noisy ground currents from logic gates do not
interact with the analog signals.
Inevitably, two or more circuits will be joined together with their
grounds at differential potentials. In these situations, the differential input of an instrumentation amplifier, with its high CMR,
can accurately transfer analog information from one circuit to
another.
SENSE AND REFERENCE TERMINALS
(4)
The sense terminal completes the feedback path for the instrumentation amplifier output stage and is normally connected
directly to the output. The output signal is specified with respect to the reference terminal, which is normally connected to
analog ground.
–12–
REV. D
AMP01
VOLTAGE GAIN, G =
+15V
C3
0.047mF
(20R3 R )
S
RS
10kV
G1
*
AV = 500 WITH COMPONENTS SHOWN
15
RS
+15V
7
6
GUARD
DRIVE
2
RG3
200V
3
RG2
200V
741
1
RG1
400V
4
–15V
3
–IN
6
*
12
RG
7
V+
RG
R1
1MV
R5
8
OUTPUT
*
11
VOOS
NULL
VIOS
NULL
9
V–
10
5
*SOLDER LINK
4
17
16
R2
1MV
SENSE
13
AMP01
2
10mF
14
RS
18
+IN
+ C5
C1
0.047mF
R4
NC
*
VR2
100kV
VR1
100kV
REFERENCE
R3
*
C4
0.047mF
SIGNAL
GROUND
GROUND
+ C6
C2
0.047mF
10mF
–15V
Figure 31. AMP01 Evaluation Circuit Showing Guard-Drive Connection
ANALOG
POWER SUPPLY
+15V
DIGITAL
POWER SUPPLY
0V
–15V
0V
+5V
4.7mF
+
C
C
C
DIGITAL
GROUND
C
7
9
AMP01
SMP-11
SAMPLE AND HOLD
C
C
C
ANALOG
GROUND
DIGITAL
GROUND
ADC
8
OUTPUT
REFERENCE
HOLD
CAPACITOR
C = 0.047mF CERAMIC CAPACITORS
Figure 32. Basic Grounding Practice
REV. D
–13–
DIGITAL
DATA
OUTPUT
AMP01
combination of these unique features in an instrumentation
amplifier allows low-level transducer signals to be conditioned
and directly transmitted through long cables in voltage or current form. Increased output current brings increased internal
dissipation, especially with 50 Ω loads. For this reason, the
power-supply connections are split into two pairs; pins 10 and
13 connect to the output stage only and pins 11 and 12 provide
power to the input and following stages. Dual supply pins allow
dropper resistors to be connected in series with the output stage
so excess power is dissipated outside the package. Additional
decoupling is necessary between pins 10 and 13 to ground to
maintain stability when dropper resistors are used. Figure 34
shows a complete circuit for driving 50 Ω loads.
If heavy output currents are expected and the load is situated
some distance from the amplifier, voltage drops due to track or
wire resistance will cause errors. Voltage drops are particularly
troublesome when driving 50 Ω loads. Under these conditions,
the sense and reference terminals can be used to “remote sense”
the load as shown in Figure 33. This method of connection puts
the I×R drops inside the feedback loop and virtually eliminates
the error. An unbalance in the lead resistances from the sense
and reference pins does not degrade CMR, but will change the
output offset voltage. For example, a large unbalance of 3 Ω will
change the output offset by only 1 mV.
DRIVING 50 ⍀ LOADS
Output currents of 50 mA are guaranteed into loads of up to
50 Ω and 26 mA into 500 Ω. In addition, the output is stable
and free from oscillation even with a high load capacitance. The
V+
RS
* IN4148 DIODES ARE OPTIONAL. DIODES LIMIT THE OUTPUT
VOLTAGE EXCURSION IF SENSE AND/OR REFERENCE LINES
BECOME DISCONNECTED FROM THE LOAD.
14
18
+IN
15
SENSE
12
1
13
*
7
RG
9
AMP01
2
–IN
10
8
REFERENCE
REMOTE
LOAD
TWISTED
PAIRS
11
3
*
OUTPUT
GROUND
V–
Figure 33. Remote Load Sensing
POWER BANDWIDTH, G = 100, 130kHz
POWER BANDWIDTH, G = 10, 200kHz
T.H.D.~0.04% @ 1kHz, 2Vrms
+15V
R1
130V
1W
RS
5kV
0.047mF
C1
0.047mF
14
18
+IN
15
12
SENSE
13
1
7
8
2
10
11
VOLTAGE GAIN, G =
R2
130V
1W
20 3 RS
(
RG
50V
LOAD
REFERENCE
C2
0.047mF
3
–IN
VOUT
63V MAX
9
AMP01
RG
0.047mF
–15V
)
RESISTERS R1 AND R2 REDUCE IC DISSIPATION
Figure 34. Driving 50 Ω Loads
–14–
REV. D
AMP01
HEATSINKING
To maintain high reliability, the die temperature of any IC
should be kept as low as practicable, preferably below 100°C.
Although most AMP01 application circuits will produce very
little internal heat — little more than the quiescent dissipation
of 90 mW—some circuits will raise that to several hundred
milliwatts (for example, the 4-20 mA current transmitter application, Figure 37). Excessive dissipation will cause thermal
shutdown of the output stage thus protecting the device from
damage. A heatsink is recommended in power applications to
reduce the die temperature.
Several appropriate heatsinks are available; the Thermalloy
6010B is especially easy to use and is inexpensive. Intended for
dual-in-line packages, the heatsink may be attached with a
cyanoacrylate adhesive. This heatsink reduces the thermal resistance between the junction and ambient environment to approximately 80°C/W. Junction (die) temperature can then be
calculated by using the relationship:
Pd =
TJ – TA
θ JA
External series resistors could be added to guard against higher
voltage levels at the input, but resistors alone increase the input
noise and degrade the signal-to-noise ratio, especially at high
gains.
Protection can also be achieved by connecting back-to-back
9.1 V Zener diodes across the differential inputs. This technique
does not affect the input noise level and can be used down to a
gain of 2 with minimal increase in input current. Although
voltage-clamping elements look like short circuits at the limiting
voltage, the majority of signal sources provide less than 50 mA,
producing power levels that are easily handled by low-power
Zeners.
Simultaneous connection of the differential inputs to a low
impedance signal above 10 V during normal circuit operation is
unlikely. However, additional protection involves adding 100 Ω
current-limiting resistors in each signal path prior to the voltage
clamp, the resistors increase the input noise level to just
5.4 nV/√Hz (refer to Figure 35).
Input components, whether multiplexers or resistors, should be
carefully selected to prevent the formation of thermocouple
junctions that would degrade the input signal.
where TJ and TA are the junction and ambient temperatures
respectively, θJA is the thermal resistance from junction to ambient, and Pd is the device’s internal dissipation.
* OPTIONAL PROTECTION
RESISTORS, SEE TEXT.
+IN
Instrumentation amplifiers invariably sit at the front end of
instrumentation systems where there is a high probability of
exposure to overloads. Voltage transients, failure of a transducer, or removal of the amplifier power supply while the signal
source is connected may destroy or degrade the performance of
an unprotected amplifier. Although it is impractical to protect
an IC internally against connection to power lines, it is relatively
easy to provide protection against typical system overloads.
AMP01 noise level approaches the theoretical noise floor of the
input stage which would be 4 nV/√Hz at 1 kHz when the gain is
set at 1000. Noise is the result of shot noise in the input devices
and Johnson noise in the resistors. Resistor noise is calculated
from the values of RG (200 Ω at a gain of 1000) and the input
protection resistors (250 Ω). Active loads for the input transistors contribute less than 1 nV/√Hz of noise. The measured noise
level is typically 5 nV/√Hz.
Diodes across the input transistor’s base-emitter junctions,
combined with 250 Ω input resistors and RG, protect against
differential inputs of up to ± 20 V for gains of up to 100. The
diodes also prevent avalanche breakdown that would degrade
the IB and IOS specifications. Decreasing the value of RG for
gains above 100 limits the maximum input overload protection
to ± 10 V.
REV. D
LINEAR INPUT RANGE,
65V MAXIMUM
DIFFERENTIAL PROTECTION
TO 630V
100V
1W*
OVERVOLTAGE PROTECTION
The AMP01 is internally protected against overloads for gains
of up to 100. At higher gains, the protection is reduced and
some external measures may be required. Limited internal overload protection is used so that noise performance would not be
significantly degraded.
+15V
9.1V 1W
ZENERS
–IN
AMP01
VOUT
100V
1W*
–15V
Figure 35. Input Overvoltage Protection for Gains
2 to 10,000
POWER SUPPLY CONSIDERATIONS
Achieving the rated performance of precision amplifiers in a
practical circuit requires careful attention to external influences.
For example, supply noise and changes in the nominal voltage
directly affect the input offset voltage. A PSR of 80 dB means
that a change of 100 mV on the supply, not an uncommon
value, will produce a 10 µV input offset change. Consequently,
care should be taken in choosing a power unit that has a low
output noise level, good line and load regulation, and good
temperature stability.
–15–
AMP01
+15V
COMPLIANCE, TYPICALLY 610V
LINEARITY ~0.01%
OUTPUT RESISTANCE AT 20mA ~5MV
POWER BANDWIDTH (–3dB) ~60kHz
INTO 500V LOAD
0.047mF
18
+IN
ROUT
TRIM
12
V+
1
VIN
13
SENSE
7
9
RG
RG
2kV
AMP01
2
R2
200V
R1
100V
6IOUT
8
RG
10
REFERENCE
V–
11
RS
15
3
–IN
RS
IOUT = VIN
14
0.047mF
G 3 R1
)
R1 = 100V FOR IOUT = 620mA
VIN = 6100mV FOR 620mA FULL SCALE
–15V
RS
2kV
20 3 RS
(R
Figure 36. High Compliance Bipolar Current Source with 13-Bit Linearity
ALL RESISTORS 1% METAL FILM
+15V
TO +30V
RS
2kV
+IN
18
0.047mF
14
RS
15
RS
R3
100V
12
V+
1
13
RG
RG
2.75kV
7
9
AMP01
2
8
RG
10
R2
200V
ROUT TRIM
REF-02
R5
2.21kV
6
V–
11
–IN
3
R4
100V
2
4
R6
500V
ZERO TRIM
R1
100V
IOUT
4mA TO 20mA
0V
0.047mF
–5V
COMPLIANCE OF IOUT, +20V WITH +30V SUPPLY (OUTPUT w.r.t. 0V)
DIFFERENTIAL INPUT OF 100mV FOR 16mA SPAN
OUTPUT RESISTANCE ~5MV AT IOUT = 20mA
LINEARITY 0.01% OF SPAN
Figure 37. 13-Bit Linear 4–20 mA Transmitter Constructed by Adding a Voltage Reference.
Thermocouple Signals Can Be Accepted Without Preamplification.
–16–
REV. D
AMP01
+15V
+
10mF
0.047mF
10kV
14
RS
18
+IN
1
2N4921
15
RS
12
V+
0.047mF
13
SENSE
7
9
RG
AMP01
RG
2
VOUT
(610V INTO 10V)
8
REFERENCE
RG
10
V–
11
3
–IN
100V
2N4918
GND
0.047mF
VOLTAGE GAIN, G = 100
POWER BANDWIDTH (–3dB), 60kHz
QUIESCENT CURRENT, 4mA
LINEARITY~0.01% @ FULL OUTPUT INTO 10V
+
–15V
Figure 38. Adding Two Transistors Increases Output Current to ±1 A Without Affecting the Quiescent Current of 4 mA.
Power Bandwidth is 60 kHz.
Q1, Q2...........J110
Q3, Q4, Q5....J107
IC1 ...............CMP-04
IC2 ...............OP15GZ
RS
10kV
18
+IN
1
–IN
200kV
20kV
2kV
0.047mF
14
RS
RG
15
RS
196V
9
AMP01
V–
Q2
47kV
VOOS
NULL
Q1
+15V
2
3
3
IC2
4
7
Q5
Q3
47kV
RG VIOS
NULL
1
14
10
11
27kV
+15V
2.7kV
+
+
+
REFERENCE
5
GND
4
16
13
0.047mF
–15V
3
4
6
8
10
OUT
8
17
2
2
SENSE
13
Q4
47kV
7
12
V+
47kV
6
+15V
100kV
+
100kV
IC1
LINEARITY~0.005%, G = 10 AND 100
~0.02%, G = 1 AND 1000
12
GAIN ACCURACY, UNTRIMMED~0.5%
5
7
G1
G10
9
G100
11
–15V
G1000
SETTLING TIME TO 0.01%, ALL GAINS,
LESS THAN 75ms
GAIN SWITCHING TIME, LESS THAN 100ms
TTL COMPATIBLE INPUTS
Figure 39. The AMP01 Makes an Excellent Programmable-Gain Instrumentation Amplifier. Combined Gain-Switching
and Settling Time to 13 Bits Falls Below 100 µ s. Linearity Is Better than 12 Bits over a Gain Range 1 to 1000.
REV. D
–17–
AMP01
RS
10kV
+15V
0.047mF
18
+IN
*5kV
RS
15
RS
1
*MATCHED TO 0.1%
0V
14
12
V+
13
7
*5kV
9
AMP01
RG
2
1.5kV
SENSE
RG
2
470pF
8
RG
6
OP37
3
REFERENCE
10
V–
11
7
4
3
–IN
0.047mF
0V
VOLTAGE GAIN, G =
20 3 RS
(
RG
–15V
)
RL
MAXIMUM OUTPUT, 20V p-p INTO 600V
T.H.D. 0.01% @ 1kHz, 20V p-p INTO 600V, G = 10
+
OUTPUT
DIFFERENTIAL COMMON-MODE
OUTPUT
REFERENCE
(65V MAX)
Figure 40. A Differential Input Instrumentation Amplifier with Differential Output Replaces a Transformer in Many
Applications. The Output will Drive a 600 Ω Load at Low Distortion, (0.01%).
+15V
POWER BANDWIDTH (–3dB)~150kHz
8
18
REF
0.047mF
1
12
V+
13
RG
R1
390V
9
AMP01
2
10mF
7
SENSE
VIN
RG
RS
3
RS
14
V–
11
VOUT
10
R2
4.95kV
NC
CL
RL
15
0.047mF
+
NC
10mF
–15V
R3
50V
CLOSED-LOOP VOLTAGE GAIN MUST BE
GREATER THAN 50 FOR STABLE OPERATION
NC = NO CONNECT
TOTAL HARMONIC DISTORTION~0.006%
@1kHz, 20V p-p INTO 500V // 1000pF
+
(
VOLTAGE GAIN, G = 1 +
R2
R3
)
Figure 41. Configuring the AMP01 as a Noninverting Operational Amplifier Provides Exceptional Performance. The
Output Handles Low Load Impedances at Very Low Distortion, 0.006%.
–18–
REV. D
AMP01
NC
R1
14
RS
3
VIN
NC
15
RS
0.01mF
2
8
REF
9
AMP01
1
R3
7
SENSE
RG
R4
4.7kV
R2
220kV
RG
V–
12
18
V–
11
10
20V p-p INTO 500V // 1000pF.
TOTAL HARMONIC DISTORTION:
<0.005% @ 1kHz, VOUT = 20V p-p
G = 1 TO 1000
13
R1 =
VOUT
R2
GAIN (G)
+
0.047mF
10mF
R3 = R1 // R2
+
R4 = 1.5kV @ G = 1
1.2kV @ G = 10
120V @ G = 100 AND 1000
+15V
10mF
0.047mF
–15V
Figure 42. The Inverting Operational Amplifier Configuration has Excellent Linearity over the Gain Range 1 to 1000, Typically
0.005%. Offset Voltage Drift at Unity Gain Is Improved over the Drift in the Instrumentation Amplifier Configuration.
+15V
R1
4.7kV
8
680pF
18
REF
VIN
+
7
SENSE
0.01mF
1
R3
330V
12
V+
POWER BANDWIDTH (–3dB)~60kHz
TOTAL HARMONIC DISTORTION~0.001%
@1kHz, 20V p-p INTO 500V // 1000pF
NC = NO CONNECT
13
RG
RG
3kV
9
AMP01
2
10mF
0.047mF
RG
RS
3
RS
14
V–
11
VOUT
CL
10
RL
R2
4.7kV
15
0.047mF
NC
+
10mF
–15V
NC
Figure 43. Stability with Large Capacitive Loads Combined with High Output Current Capability make the AMP01 Ideal
for Line Driving Applications. Offset Voltage Drift Approaches the TCVIOS Limit, (0.3 µ V/ °C).
REV. D
–19–
AMP01
V+
V–
16.2kV
1mF
13
18
12
1 R
G
RG
200kV
20kV
2kV
2
11
10
200V
1.82kV
7
G1
2
3
3
8
15
16.2kV
5
RS
14
1mF
en (G = 1000) =
6
eOUT
G1000
1000 3 G
V–
1mF
+
1/2 OP215
10kV
en (G = 1, 10, 100) =
V+
1.62MV
RS
RG
OUTPUT
4
+
8
8
RG
G1000
1
1/2 OP215
9
AMP01
G100
G10
–
7
–
9.09kV
G1,10,100
eOUT
100 3 G
100V
1kV
Figure 44. Noise Test Circuit (0.1 Hz to 10 Hz)
200V
10T
VIN
20V p-p
1.91kV
0.1%
VOUT
2 3 HSCH-1001
10kV
0.1%
G10
G1
14
RS
3
G100
1.1kV
0.1%
G1000
102V
0.1%
2kV
0.1%
10kV
0.1%
1 R
G
RG
10V
0.1%
200kV
0.1%
G1
20kV
0.1%
G10
2kV
0.1%
15
RS
200V
0.1%
G100
7
9
AMP01
8
8
RG
G1000
10
2
RG
11
12
18
13
0.047mF
0.047mF
V+
V–
Figure 45. Settling-Time Test Circuit
–20–
REV. D
AMP01
+15V
RS
10kV
0.047mF
11
16
+IN
1
15
18
RS
1
15
RG
200V
ANALOG
SWITCH
SENSE
7
9
13
AMP01
2
6
5
8
14
VOUT
7.5kV
8
4
S
12
V+
RG
DG390
10
(20 R3 R )
G
RS
3
9
–IN
VOLTAGE GAIN, G =
14
RG
10
V–
REFERENCE
11
15kV
3
13
61mA
13
14
4
DAC-08
1, 2
16
15
3
0.047mF
R1
100V
0.01mF
7.5kV
TTL INPUT
"OFFSET"
0V
TTL INPUT
"ZERO"
–15V
Figure 46. Instrumentation Amplifier with Autozero
+18V
10kV
0.047mF
14
18
1
10kV
2
3
RS
15
12
RS
RG
SENSE
13
7
9
AMP01
VOUT
8
RG
10
11
0.047mF
–18V
Figure 47. Burn-In Circuit
REV. D
–21–
AMP01
OUTLINE DIMENSIONS
Dimensions shown in inches and (mm).
18-Lead Cerdip
(Q-18)
0.005 (0.13) MIN
18
C3103b–0–12/99
0.098 (2.49) MAX
10
0.310 (7.87)
0.220 (5.59)
1
9
0.320 (8.13)
0.290 (7.37)
PIN 1
0.060 (1.52)
0.015 (0.38)
0.960 (24.38) MAX
0.200 (5.08)
MAX
0.200 (5.08)
0.125 (3.18)
0.023 (0.58)
0.014 (0.36)
0.150
(3.81)
MIN
0.100
(2.54)
BSC
0.070 (1.78) SEATING
0.030 (0.76) PLANE
0.015 (0.38)
0.008 (0.20)
158
08
28-Terminal Ceramic Leadless Chip Carrier
(E-28A)
0.075
(1.91)
REF
0.100 (2.54)
0.064 (1.63)
0.458 (11.63)
0.442 (11.23) 0.458
SQ
(11.63)
MAX
SQ
0.095 (2.41)
0.075 (1.90)
0.300 (7.62)
BSC
0.150
(3.51)
BSC
26
25
0.015 (0.38)
MIN
4
28
5
1
0.011 (0.28)
0.007 (0.18)
R TYP
0.075
(1.91)
REF
0.088 (2.24)
0.054 (1.37)
BOTTOM
VIEW
19
18
0.055 (1.40)
0.045 (1.14)
12
11
0.200
(5.08)
BSC
0.028 (0.71)
0.022 (0.56)
0.050
(1.27)
BSC
458 TYP
20-Lead SOIC
(R-20)
1
10
PIN 1
0.0118 (0.30)
0.0040 (0.10)
0.1043 (2.65)
0.0926 (2.35)
PRINTED IN U.S.A.
11
0.4193 (10.65)
0.3937 (10.00)
20
0.2992 (7.60)
0.2914 (7.40)
0.5118 (13.00)
0.4961 (12.60)
0.0291 (0.74)
3 458
0.0098 (0.25)
88 0.0500 (1.27)
0.0500 0.0192 (0.49)
08 0.0157 (0.40)
(1.27) 0.0138 (0.35) SEATING 0.0125 (0.32)
PLANE
BSC
0.0091 (0.23)
–22–
REV. D