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30 V, High Speed, Low Noise, Low Bias
Current, JFET Operational Amplifier
ADA4627-1/ADA4637-1
FEATURES
Low offset voltage: 200 µV maximum
Offset drift: 1 µV/°C typical
Very low input bias current: 5 pA maximum
Extended temperature range: −40°C to +125°C
±5 V to ±15 V dual supply
ADA4627-1 GBW: 19 MHz
ADA4637-1 GBW: 79 MHz
Voltage noise: 6.1 nV/√Hz at 1 kHz
ADA4627-1 slew rate: 82 V/µs
ADA4637-1 slew rate: 170 V/µs
High gain: 120 dB typical
High CMRR: 116 dB typical
High PSRR: 112 dB typical
PIN CONFIGURATIONS
NULL
1
–IN
2
+IN
3
V–
4
8
NC
V+
OUT
07559-001
ADA4627-1
TOP VIEW
(Not to Scale)
7
6
5
NULL
NC = NO CONNECT
Figure 1. 8-Lead SOIC_N (R-8)
NULL
1
–IN
2
+IN
3
V–
4
8
NC
V+
OUT
07559-103
ADA4637-1
TOP VIEW
(Not to Scale)
7
6
5
NULL
NC = NO CONNECT
APPLICATIONS
High impedance sensors
Photodiode amplifier
Precision instrumentation
Phase-locked loop filters
High end, professional audio
DAC output amplifier
ATE
Medical
Figure 2. 8-Lead SOIC_N (R-8)
NC 1
–IN 2
+IN 3
V– 4
PIN 1
INDICATOR
8 NC
7 V+
6 OUT
5 NC
ADA4627-1/
ADA4637-1
TOP VIEW
(Not toScale)
Figure 3. 8-Lead LFCSP_VD (CP-8-2)
GENERAL DESCRIPTION
The ADA4627-1/ADA4637-1 are wide bandwidth precision
amplifiers featuring low noise, very low offset, drift, and bias
current. The parts operate from ±5 V to ±15 V dual supply.
The ADA4627-1/ADA4637-1 provide benefits previously found
in few amplifiers. These amplifiers combine the best specifications
of precision dc and high speed ac op amps. The ADA4637-1 is
a decompensated version of the ADA4627-1 and is stable at a
noise gain of 5 or greater.
With a typical offset voltage of only 70 µV, drift of less than
1 µV/°C, and noise of only 0.86 µV p-p (0.1 Hz to 10 Hz), the
ADA4627-1/ADA4637-1 are suited for applications where error
sources cannot be tolerated.
Table 1. High Speed Precision Op Amps
Supply
Single
Dual
Quad
5 V Low Cost
AD8615
AD8616
AD8618
5V
AD8651
AD8652
26 V Low Power
AD8610
AD8620
30 V Low Cost
AD8510
AD8512
AD8513
30 V
ADA4627-1/ADA4637-1
The ADA4627-1/ADA4637-1 are specified for both the
industrial temperature range of −25°C to +85°C and the
extended industrial temperature range of −40°C to +125°C. The
ADA4627-1/ ADA4637-1 are available in tiny 8-lead LFCSP
and 8-lead SOIC packages.
The ADA4627-1/ADA4637-1 are members of a growing series
of high speed, precision op amps offered by Analog Devices,
Inc. (see Table 1).
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 that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarks and registered trademarks are the property of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
www.analog.com
Tel: 781.329.4700
Fax: 781.461.3113 ©2009-2010 Analog Devices, Inc. All rights reserved.
07559-002
NOTES
1. NC = NO CONNECT.
2. IT IS RECOMMENDED
THAT THE EXPOSED PAD BE
CONNECTED TO V–.
ADA4627-1/ADA4637-1
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications ....................................................................................... 1
Pin Configurations ........................................................................... 1
General Description ......................................................................... 1
Revision History ............................................................................... 2
Specifications..................................................................................... 3
Electrical Characteristics—30 V Operation ............................. 3
Absolute Maximum Ratings ............................................................ 5
Thermal Resistance ...................................................................... 5
ESD Caution .................................................................................. 5
Typical Performance Characteristics ............................................. 6
Theory of Operation ...................................................................... 14
Input Voltage Range ................................................................... 14
Input Offset Voltage Adjust Range........................................... 14
Input Bias Current ...................................................................... 14
Noise Considerations ................................................................. 14
THD + N Measurements ........................................................... 15
Printed Circuit Board Layout, Bias Current, and Bypassing 15
Output Phase Reversal ............................................................... 15
Decompensated Op Amps ........................................................ 16
Driving Capacitive Loads .......................................................... 16
Outline Dimensions ....................................................................... 17
Ordering Guide .......................................................................... 18
REVISION HISTORY
10/10—Rev. C to Rev. D
Changes to Figure 1 and General Description.............................. 1
Changes to Ordering Guide .......................................................... 18
7/10—Rev. B to Rev. C
Added ADA4637-1 ............................................................. Universal
Added Figure 2; Renumbered Sequentially .................................. 1
Changes to Table 2 ............................................................................ 3
Change to Table 3 ............................................................................. 5
Changes to Typical Performance Characteristics Section ........... 6
Updated Outline Dimensions ....................................................... 17
Changes to Ordering Guide .......................................................... 18
10/09—Rev. A to Rev. B
Changes to Figure 2 ...........................................................................1
9/09—Rev. 0 to Rev. A
Changes to General Description Section .......................................1
Changes to Table 2.............................................................................3
Updated Outline Dimensions ....................................................... 14
Changes to Ordering Guide .......................................................... 15
7/09—Revision 0: Initial Version
Rev. D | Page 2 of 20
ADA4627-1/ADA4637-1
SPECIFICATIONS
ELECTRICAL CHARACTERISTICS—30 V OPERATION
V
SY
= ±15 V, V
CM
= 0 V, T
A
= 25°C, unless otherwise noted.
Table 2.
Parameter
INPUT CHARACTERISTICS
Offset Voltage
1
Symbol
V
OS
−40°C ≤ T
A
≤ +85°C
−40°C ≤ T
A
≤ +125°C
−40°C ≤ T
A
≤ +125°C
V
SY
= ±4.5 V to ±18 V
−40°C ≤ T
A
≤ +125°C
Input Bias Current
2
Test Conditions/Comments
Min
B Grade
Typ
70
Max
200
350
400
2
Min
A Grade
Typ
120
Max
300
410
660
3
Unit
µV
µV
µV
µV/°C
dB
dB
pA
nA
nA
pA
nA
nA
nV/√Hz
nV/√Hz
nV/√Hz
nV/√Hz
µV p-p
fA/√Hz
fA p-p
TΩ
pF
pF
Offset Voltage Drift,
Average
Power Supply Rejection
Ratio
∆V
OS
/∆T
PSRR
1
106
101
1
112
1
103
99
108
I
B
−40°C ≤ T
A
≤ +85°C
−40°C ≤ T
A
≤ +125°C
Input Offset Current
I
OS
−40°C ≤ T
A
≤ +85°C
−40°C ≤ T
A
≤ +125°C
0.5
5
0.5
2
5
0.5
2
40
20
8
6
1.6
1
0.5
5
0.5
2
5
0.5
2
40
20
8
6
1.6
NOISE PERFORMANCE
Voltage Noise Density
e
n
Voltage Noise
Current Noise Density
Current Noise
Input Resistance
Input Capacitance,
Differential Mode
Input Capacitance,
Common Mode
Input Voltage Range
e
n
p-p
i
n
i
n
p-p
R
IN
C
INDM
C
INCM
IVR
f = 10 Hz
f = 100 Hz
f = 1 kHz
f = 10 kHz
0.1 Hz to 10 Hz
f = 100 Hz
0.1 Hz to 10 Hz
16.5
7.9
6.1
4.8
0.7
1.6
30
10
8
7
−11
−10.5
106
98
112
110
102
40
40
120
116
16.5
7.9
6.1
4.8
0.7
2.5
48
10
8
7
−40°C ≤ T
A
≤ +125°C
Common-Mode
Rejection Ratio
CMRR
T
A
= 25°C,
V
CM
= −11 V to +11 V
−40°C ≤ T
A
≤ +125°C,
V
CM
= −10.5 V to +10.5 V
R
L
= 1 kΩ, V
O
= −10 V to +10 V
−40 ≤ T
A
≤ +85°C
−40 ≤ T
A
≤ +125°C
±10 V step, R
L
= 1 kΩ,
C
L
= 100 pF, A
V
= +1
±10 V step, R
L
= 1 kΩ, C
L
= 100 pF,
R
s
= R
f
= 1 kΩ, A
V
= −1
±10 V out, C
f
= 4.8 pF, A
V
= −4
±10 V out, C
f
= 4.8 pF, A
V
= +5
+11
+10.5
−11
−10.5
100
97
106
104
100
40
40
120
110
+11
+10.5
V
V
dB
Large Signal Voltage Gain
A
VO
dB
dB
dB
dB
V/µs
V/µs
V/µs
V/µs
DYNAMIC PERFORMANCE
Slew Rate ADA4627-1
SR
SR
56/78
3
82/84
3
170
170
56/78
3
82/84
3
170
170
Slew Rate ADA4637-1
SR
SR
Rev. D | Page 3 of 20
ADA4627-1/ADA4637-1
Parameter
Settling Time to 0.01%
ADA4627-1
ADA4637-1
Settling Time to 0.1%
ADA4627-1
ADA4637-1
Gain Bandwidth Product
ADA4627-1
ADA4637-1
Phase Margin
ADA4627-1
ADA4637-1
Total Harmonic
Distortion + Noise
POWER SUPPLY
Supply Current per
Amplifier
OUTPUT CHARACTERISTICS
Output Voltage High
GBP
R
L
= 1 kΩ, C
L
= 20 pF, A
V
= 1
A
V
= 10
Φ
M
R
L
= 1 kΩ, C
L
= 20 pF, A
V
= 1
A
V
= 10
f = 1 kHz, A
V
= 1, ADA4627-1
72
85
0.000045
72
85
0.000045
Degrees
%
16
4
19
79.9
16
4
19
79.9
MHz
t
S
V
IN
= 10 V step, C
L
= 35 pF,
R
L
= +1 kΩ, A
V
= −1
V
OUT
= 10 V step, C
L
= 35 pF,
R
L
= +1 kΩ, A
V
= −4
450
200
450
200
ns
ns
Symbol
t
S
Test Conditions/Comments
V
IN
= 10 V step, C
L
= 35 pF,
R
L
= +1 kΩ, A
V
= −1
V
IN
= 10 V step, C
L
= 35 pF,
R
L
= +1 kΩ, A
V
= −4
Min
B Grade
Typ
550
300
Max
Min
A Grade
Typ
550
300
Max
Unit
ns
ns
THD + N
I
SY
I
O
= 0 mA
−40°C ≤ T
A
≤ +125°C
±7.0
±7.5
±7.8
±7.0
±7.5
±7.8
mA
mA
V
V
V
V
V
V
mA
mA
Ω
V
OH
Output Voltage Low
V
OL
Output Current
Short-Circuit Current
Closed-Loop Output
Impedance
1
2
I
OUT
I
SC
Z
OUT
R
L
= 1 kΩ to V
CM
−40°C ≤ T
A
≤ +85°C
−40°C ≤ T
A
≤ +125°C
R
L
= 1 kΩ to V
CM
−40°C ≤ T
A
≤ +85°C
−40°C ≤ T
A
≤ +125°C
V
O
= ±10 V
T
A
= 25°C
f = 1 MHz, A
V
= −100
12.0
11.8
11.7
12.3
12.0
11.8
11.7
−12.3
−12.1
−12.0
12.3
−12.7
−12.7
−12.3
−12.1
−12.0
±45
+70/−55
41
±45
+70/−55
41
V
OS
is measured fully warmed up.
Tested/extrapolated from 125°C.
3
Rising/falling.
4
Not tested. Guaranteed by simulation and characterization.
Rev. D | Page 4 of 20
Discrete Device
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