ANALOG DEVICES ADA4000-1, ADA4000-2, ADA4000-4 Service Manual
Low Cost, Precision JFET
O
www.BDTIC.com/ADI
FEATURES
High slew rate: 20 V/μs
Fast settling time
Low offset voltage: 1.70 mV maximum
Bias current: 40 pA maximum
±4 V to
±18 V operation
Low voltage noise: 16 nV/√Hz
Unity gain stable
Common-mode voltage includes +V
Wide bandwidth: 5 MHz
APPLICATIONS
Reference gain/buffers
Level shift/driving
Active filters
Power line monitoring/control
Current/voltage sense or monitoring
Data acquisition
Sample-and-hold circuits
Integrators
GENERAL DESCRIPTION
The ADA4000-1/ADA4000-2/ADA4000-4 are JFET input
operational amplifiers featuring precision, very low bias current,
and low power. Combining high input impedance, low input
bias current, wide bandwidth, fast slew rate, and fast settling
time, the ADA4000-1/ADA4000-2/ADA4000-4 are ideal
amplifiers for driving analog-to-digital inputs and buffering
digital-to-analog converter outputs. The input common-mode
voltage includes the positive power supply, which makes the
part an excellent choice for high-side signal conditioning.
Additional applications for the ADA4000-1/ADA4000-2/
A4000-4 include electronic instruments, ATE amplification,
AD
buffering, integrator circuits, instrumentation-quality photodiode
amplification, and fast precision filters (including PLL filters).
The parts also include utility functions, such as reference
buffering, level shifting, control I/O interface, power supply
control, and monitoring functions.
S
Input Operational Amplifiers
ADA4000-1/ADA4000-2/ADA4000-4
PIN CONFIGURATIONS
UT
1
ADA4000-1
TOP VIEW
V–
2
(Not to Scale)
+IN
3
Figure 1. 5-Lead TSOT (UJ-5)
NC
1
–IN
2
ADA4000-1
TOP VIEW
3
+IN
(Not to Scale)
V–
4
NC = NO CON NECT
Figure 2. 8-Lead SOIC (R-8)
1
OUT A
–IN A
2
ADA4000-2
–V
TOP VIEW
3
(Not to Scale)
4
+IN A
Figure 3. 8-Lead SOIC (R-8)
OUT A
1
2
–IN A
+IN A
–V
ADA4000-2
TOP VIEW
3
(Not to Scale)
4
Figure 4. 8-Lead MSOP (RM-8)
1
OUT A
–IN A
2
+IN A
3
ADA4000-4
4
+V
TOP VIEW
+IN B
–IN B
OUT B
(Not to Scale)
5
6
7
Figure 5. 14-Lead SOIC (R-14)
1
OUT A
2
–IN A
3
+IN A
+IN B
–IN B
OUT B
+V
ADA4000-4
TOP VIEW
4
(Not to S cale)
5
6
7
Figure 6. 14-Lead TSSOP (RU-14)
8
7
6
5
5
4
8
7
6
5
8
7
6
5
14
13
12
11
10
14
13
12
11
10
9
8
9
8
V+
–IN
NC
V+
OUT
NC
+V
OUT B
–IN B
+IN B
+V
OUT B
–IN B
+IN B
OUT D
–IN D
+IN D
–V
+IN C
–IN C
OUT C
OUT D
–IN D
+IN D
–V
+IN C
–IN C
OUT C
05791-001
05791-002
05791-027
05791-028
05791-029
05791-030
Rev. 0
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Anal og Devices for its use, nor for any infringements of patents or ot her
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.
Tel: 781.329.4700 www.analog.com
Fax: 781.461.3113 ©2007 Analog Devices, Inc. All rights reserved.
ADA4000-1/ADA4000-2/ADA4000-4
www.BDTIC.com/ADI
TABLE OF CONTENTS
Features.............................................................................................. 1
Applications....................................................................................... 1
General Description ......................................................................... 1
Pin Configurations ........................................................................... 1
Revision History ............................................................................... 2
Specifications..................................................................................... 3
Electrical Characteristics ............................................................. 3
Absolute Maximum Ratings............................................................ 5
Thermal Resistance ...................................................................... 5
REVISION HISTORY
5/07—Revision 0: Initial Version
Power Sequencing.........................................................................5
ESD Caution...................................................................................5
Typical Performance Characteristics..............................................6
Applications..................................................................................... 10
Output Phase Reversal and Input Noise ................................. 10
Capacitive Load Drive ............................................................... 10
Settling Time............................................................................... 11
Outline Dimensions....................................................................... 12
Ordering Guide .......................................................................... 14
Rev. 0 | Page 2 of 16
ADA4000-1/ADA4000-2/ADA4000-4
www.BDTIC.com/ADI
SPECIFICATIONS
ELECTRICAL CHARACTERISTICS
VS = ±15.0 V, VCM = VS/2 V, TA = 25°C, unless otherwise specified.
Table 1.
Parameter Symbol Conditions Min Typ Max Unit
INPUT CHARACTERISTICS
Offset Voltage VOS 0.2 1.70 mV
−40°C ≤ TA ≤ +125°C 3.0 mV
Input Bias Current IB 5 40 pA
−40°C ≤ TA ≤ +85°C 170 pA
−40°C ≤ TA ≤ +125°C 4.5 nA
Input Offset Current IOS 2 40 pA
−40°C ≤ TA ≤ +85°C 80 pA
−40°C ≤ TA ≤ +125°C 500 pA
Input Voltage Range IVR −11 +15 V
Common-Mode Rejection Ratio CMRR −11 V ≤ VCM ≤ +15 V 80 100 dB
−40°C ≤ TA ≤ +125°C 100 dB
Open-Loop Gain AVO R
Offset Voltage Drift ΔVOS/ΔT −40°C ≤ TA ≤ +125°C 2 μV/°C
OUTPUT CHARACTERISTICS
Output Voltage High VOH R
−40°C ≤ TA ≤ +125°C 13.40 V
Output Voltage Low VOL R
−40°C ≤ TA ≤ +125°C −12.80 V
Short-Circuit Current ISC ±28 mA
POWER SUPPLY
Power Supply Rejection Ratio PSRR VS = ±4.0 V to ±18.0 V 82 92 dB
Supply Current/Amplifier ISY 1.35 1.65 mA
−40°C ≤ TA ≤ +125°C 1.80 mA
DYNAMIC PERFORMANCE
Slew Rate SR VI = 10 V, RL = 2 kΩ 20 V/μs
Gain Bandwidth Product GBP 5 MHz
Phase Margin ΦM 60 Degrees
NOISE PERFORMANCE
Voltage Noise e
Voltage Noise Density en f = 1 kHz 16 nV/√Hz
Current Noise Density in f = 1 kHz 0.01 pA/√Hz
INPUT IMPEDANCE
Differential Mode (R||C)
Common Mode (R||C)
0.1 Hz to 10 Hz 1 μV p-p
n p-p
IN-DIFF
INCM
= 2 kΩ, VO = ±10 V 100 110 dB
L
= 2 kΩ to ground 13.60 13.90 V
L
= 2 kΩ to ground −13.4 −13.0 V
L
10||4 GΩ||pF
103||5.5 GΩ||pF
Rev. 0 | Page 3 of 16
ADA4000-1/ADA4000-2/ADA4000-4
www.BDTIC.com/ADI
VS = ±5 V, VCM = VS/2 V, TA = 25°C, unless otherwise specified.
Table 2.
Parameter Symbol Conditions Min Typ Max Unit
INPUT CHARACTERISTICS
Offset Voltage VOS 0.20 1.70 mV
−40°C ≤ TA ≤ +125°C 3.0 mV
Input Bias Current IB 5 40 pA
−40°C ≤ TA ≤ +85°C 170 pA
−40°C ≤ TA ≤ +125°C 3 nA
Input Offset Current IOS 2 40 pA
−40°C ≤ TA ≤ +85°C 80 pA
−40°C ≤ TA ≤ +125°C 500 pA
Input Voltage Range IVR −1.5 +5.0 V
Common-Mode Rejection Ratio CMRR −1.5 V ≤ VCM ≤ +3.5 V 72 80 dB
−40°C ≤ TA ≤ +125°C 80 dB
Open-Loop Gain AVO R
Offset Voltage Drift ΔVOS/ΔT −40°C ≤ TA ≤ +125°C 2 μV/°C
OUTPUT CHARACTERISTICS
Output Voltage High VOH R
−40°C ≤ TA ≤ +125°C 3.80 V
Output Voltage Low VOL R
−40°C ≤ TA ≤ +125°C −3.00 V
Short-Circuit Current ISC ±28 mA
POWER SUPPLY
Supply Current/Amplifier ISY 1.25 1.65 mA
−40°C ≤ TA ≤ +125°C 1.80 mA
DYNAMIC PERFORMANCE
Slew Rate SR VI = 10 V, RL = 2 kΩ 20 V/μs
Gain Bandwidth Product GBP 5 MHz
Phase Margin ΦM 55 Degrees
NOISE PERFORMANCE
Voltage Noise e
Voltage Noise Density en f = 1 kHz 16
Current Noise Density in f = 1 kHz 0.01
INPUT IMPEDANCE
Differential Mode (R||C)
Common Mode (R||C)
0.1 Hz to 10 Hz 1 μV p-p
n p-p
IN-DIFF
INCM
= 2 kΩ, VO = ±2.5 V 106 114 dB
L
= 2 kΩ to ground 4.0 4.20 V
L
= 2 kΩ to ground −3.45 −3.20 V
L
nV/√Hz
pA/√Hz
10||4 GΩ||pF
103||5.5 GΩ||pF
Rev. 0 | Page 4 of 16
ADA4000-1/ADA4000-2/ADA4000-4
www.BDTIC.com/ADI
ABSOLUTE MAXIMUM RATINGS
Table 3.
Parameter Rating
Supply Voltage ±18 V
Input Voltage ±V supply
Differential Input Voltage ±V supply
Output Short-Circuit Duration to GND Indefinite
Storage Temperature Range −65°C to +150°C
Operating Temperature Range −40°C to +125°C
Junction Temperature Range −65°C to +150°C
Lead Temperature (Soldering, 10 sec) 300°C
Stresses above those listed under Absolute Maximum Ratings
may cause permanent damage to the device. This is a stress
rating only; functional operation of the device at these or any
other conditions above those indicated in the operational
section of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect
device reliability.
THERMAL RESISTANCE
θJA is specified for the worst-case conditions, that is, a device
soldered in a circuit board for surface-mount packages.
Table 4. Thermal Resistance
Package Type θJA θJC Unit
5-Lead TSOT (UJ-5) 172.92 61.76 °C/W
8-Lead SOIC (R-8) 112.38 61.6 °C/W
8-Lead MSOP (RM-8) 141.9 43.7 °C/W
14-Lead SOIC (R-14) 88.2 56.3 °C/W
14-Lead TSSOP (RU-14) 114 23.3 °C/W
POWER SEQUENCING
The op amp supply voltages must be established simultaneously
with, or before, any input signals are applied. If this is not
possible, the input current must be limited to 10 mA.
ESD CAUTION
Rev. 0 | Page 5 of 16
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