ANALOG DEVICES ADA4001-2 Service Manual

Output, JFET Dual Operational Amplifier

Data Sheet

ADA4001-2

Rev. B

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Fax: [phone] ©2012 Analog Devices, Inc. All rights reserved.

10375-002

OUT A

1

–IN A

2

+IN A

3

V–

4

V+

8

OUT B

7

–IN B

6

+IN B

5

ADA4001-2

TOP VIEW

(Not to S cale)

FEATURES

Low TCVOS: ±5 µV/°C typical
Low input bias current: 20 pA typical at V
Low noise

7.7 nV/√Hz typical at f = 1 kHz

1.2 µV rms at 20 Hz to 20 kHz
Low distortion: 0.00006%
No phase reversal
Rail-to-rail output
Unity-gain stable

APPLICATIONS

Instrumentation
Medical instruments
Multipole filters
Precision current measurement
Photodiode amplifiers
Sensors
Audio

Low Noise, Low Input Bias Current, Rail-to-Rail

PIN CONFIGURATION

= ±15 V

SY

Figure 1. 8-Lead SOIC_N (R Suffix)

GENERAL DESCRIPTION

The ADA4001-2 is a dual channel JFET amplifier that features
low input voltage noise and current noise, input bias current,
and rail-to-rail output.

The combination of low noise and low input bias current makes
this amplifier especially suitable for high impedance sensor
amplification. With low noise and fast settling times, the

ADA4001-2 provides good accuracy for medical instruments,

electronic measurement, and automated test equipment. Unlike
many competitive amplifiers, the ADA4001-2 maintains fast
settling performance even with substantial capacitive loads,
and, unlike many older JFET amplifiers, the ADA4001-2 does
not suffer from output phase reversal when input voltages
exceed the maximum common-mode voltage range.

With fast slew rate and great stability under capacitive loads, the

ADA4001-2 is a good fit for filter applications. With low input

bias currents and noise, it offers a wide dynamic range for photodi­ode amplifier circuits. Low noise and distortion, along with
high output current and excellent speed, make the ADA4001-2
a great choice for audio applications.

The ADA4001-2 is specified over the −40°C to +125°C extended
industrial temperature range.

The ADA4001-2 is available in an 8-lead narrow SOIC package.

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.

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ADA4001-2 Data Sheet

TABLE OF CONTENTS

Features .............................................................................................. 1

Applications ....................................................................................... 1

Pin Configuration ............................................................................. 1

General Description ......................................................................... 1

Revision History ............................................................................... 2

Specifications ..................................................................................... 3

Electrical Characteristics ............................................................. 3

Absolute Maximum Ratings ............................................................ 4

Thermal Resistance ...................................................................... 4

ESD Caution .................................................................................. 4

REVISION HISTORY

5/12—Rev. A to Rev B

Changes to General Description Section ...................................... 1

Changed Input Impedance to Input Capacitance Throughout .. 3

Added Input Resistance Parameter, Table 1 .................................. 3

Change to Figure 5 Caption ............................................................ 5

2/12—Rev. 0 to Rev. A

Changes to Figure 27 ........................................................................ 9

2/12—Revision 0: Initial Version

Typical Performance Characteristics ..............................................5

Applications Information .............................................................. 10

Total Noise Including Source Resistors ................................... 10

I-V Conversion Applications .................................................... 10

Input Bias Current ...................................................................... 11

Noise Considerations ................................................................. 11

Outline Dimensions ....................................................................... 12

Ordering Guide .......................................................................... 12

Rev. B | Page 2 of 12

Data Sheet ADA4001-2

RL = 600 Ω, VO = −13.0 V to +13.0 V

90

93 dB

SY

M

Total Harmonic Distortion (THD) + Noise

THD + N

1 kHz, G = +1, RL = 2 kΩ

0.00006

%

SPECIFICATIONS

ELECTRICAL CHARACTERISTICS

VSY = ±15 V, VCM = 0 V, TA = 25°C, unless otherwise noted.

Table 1.

Parameter Symbol Test Conditions/Comments Min Typ Max Unit

INPUT CHARACTERISTICS

Offset Voltage VOS ±0.5 ±1.5 mV

−40°C < TA < +125°C ±2.5 mV
Offset Voltage Drift ΔVOS/ΔT ±5 µV/°C
Input Bias Current IB 20 30 pA

−40°C < TA < +125°C 4 nA
Input Offset Current IOS 20 pA

−40°C < TA < +125°C 2 nA
Input Voltage Range −12.5 +12.5 V
Common-Mode Rejection Ratio CMRR VCM = −12.5 V to +12.5 V 96 105 dB

−40°C < TA < +125°C 90 dB
Large Signal Voltage Gain AVO RL = 10 kΩ, VO = −13.5 V to +13.5 V 104 112 dB

RL = 2 kΩ, VO = −13.5 V to +13.5 V 104 112 dB

−40°C < TA < +125°C 90 dB

Input Capacitance, Differential CDM VCM = 0 V 3.1 pF
Input Capacitance, Common-Mode CCM VCM = 0 V 4.8 pF
Input Resistance VCM = 0 V >1 × 1013 Ω

OUTPUT CHARACTERISTICS

Output Voltage High VOH RL = 10 kΩ 14.8 V
RL = 2 kΩ 14.5 V
RL = 600 Ω 13.5 V
Output Voltage Low VOL RL = 10 kΩ −14.8 V
RL = 2 kΩ −14.5 V
RL = 600 Ω −13.5 V
Short-Circuit Current ISC ±50 mA

POWER SUPPLY

Power Supply Rejection Ratio PSRR VS = ±4.5 V to ±18 V 96 110 dB

−40°C < TA < +125°C 93 dB
Operating Voltage Range ±5 ±18 V
Supply Current/Amplifier I

4 mA

DYNAMIC PERFORMANCE

Slew Rate SR RL = 2 kΩ ±151 ±25 V/µs
Gain Bandwidth Product GBP VIN = 5 mV p-p, RL = 10 kΩ, AV = 100 16.7 MHz
Unity-Gain Crossover UGC VIN = 5 mV p-p, RL = 10 kΩ, AV = 1 10.2 MHz
Phase Margin φ

−3 dB Closed-Loop Bandwidth −3 dB AV = 1, VIN = 5 mV p-p 10.3 MHz
Settling Time tS To 0.01%, 10 V step, G = +1 1.2 µs

VO = 0 V 2 3 mA

76 Degrees

NOISE PERFORMANCE

Voltage Noise en rms 20 Hz to 20 kHz 1.2 μV rms
Voltage Noise Density en f = 100 Hz 8.8 nV/√Hz

f = 1 kHz 7.7 nV/√Hz

Current Noise Density in f = 1 kHz 3 fA/√Hz

1

Guaranteed by design and characterization.

Rev. B | Page 3 of 12

ADA4001-2 Data Sheet

Electrostatic Discharge

3000 V

JA

JC

ABSOLUTE MAXIMUM RATINGS

Table 2.

Parameter Rating

Supply Voltage ±18 V
Input Voltage ±VSY
Output Short-Circuit Duration to GND Observe derating curves
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

(Human Body Model)

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

Table 3.

Package Type θ

8-Lead SOIC_N (R-8) 130 45 °C/W

1

θJA is specified for worst-case conditions, that is, θJA is specified for a device

soldered in a circuit board for surface-mount packages.

1

θ

Unit

ESD CAUTION

Rev. B | Page 4 of 12