ANALOG DEVICES ADA4062-2 Service Manual

O

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Tiny, Low Power JFET-Input Op Amp

FEATURES

Low input bias current: 50 pA maximum
Offset voltage

1.5 mV maximum for ADA4062-2 B grade

2.5 mV maximum for ADA4062-2 A grade
Offset voltage drift: 4 µV/°C typical
Slew rate: 3.3 V/s typical
CMRR: 90 dB typical
Low supply current: 165 µA typical
High input impedance
Unity-gain stable
Packaging: SOIC, MSOP

APPLICATIONS

Power control and monitoring
Active filters
Industrial/process control
Body probe electronics
Data acquisition
Integrators
Input buffering

GENERAL DESCRIPTION

The ADA4062-2 is a dual JFET-input amplifier with industry­leading performance. It offers lower power, offset voltage, drift
and ultralow bias current. The ADA4062-2 B grade features typical
low offset voltage of 0.5 mV, offset drift of 4 μV/°C, and bias current
of 2 pA. The ADA4062-2 is ideal for various applications, including
process control, industrial and instrumentation equipment, active
filtering, data conversion, buffering, and power control and
monitoring. With a low supply current of 165 μA per amplifier,
it is also very well suited for lower power applications. The
ADA4062-2 is specified for the extended industrial temperature
range of −40°C to +125°C and is available in lead-free SOIC and
MSOP packages.

ADA4062-2

PIN CONFIGURATIONS

OUT A

1

ADA4062-2

–IN A

2

+IN A

Figure 1. 8-Lead Narrow-Body SOIC

UT A

–IN A

+IN A

TOP VIEW

3

(Not to Scale)

4

V–

1

ADA4062-2

2

TOP VIEW

3

(Not to Scale)

V–

4

Figure 2. 8-Lead MSOP

Table 1. Low Power Op Amps

Supply 40 V 36 V 12 V to 16 V 5 V

Single OP97 AD820 AD8641 AD8541
AD8663
Dual OP297 OP282 AD8642 AD8542
AD8682 AD8667
AD822
Quad OP497 OP482 AD8643 AD8544
AD8684 AD8669
AD824

8

7

6

5

8

7

6

5

V+

OUT B

–IN B

+IN B

V+

OUT B

–IN B

+IN B

07670-001

7670-002

Rev. 0

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.
Tel: [phone] www.analog.com
Fax: [phone] ©2008 Analog Devices, Inc. All rights reserved.

ADA4062-2

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TABLE OF CONTENTS

Features .............................................................................................. 1

Applications ....................................................................................... 1 

Pin Configurations ........................................................................... 1

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

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

Specifications ..................................................................................... 3

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

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

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

Power Sequencing ........................................................................ 4

REVISION HISTORY

10/08—Revision 0: Initial Version

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

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

Applications Information .............................................................. 14

Notch Filter ................................................................................. 14

High-Side Signal Conditioning ................................................ 14

Micropower Instrumentation Amplifier ................................. 14

Phase Reversal ............................................................................ 14

Schematic ......................................................................................... 16

Outline Dimensions ....................................................................... 17

Ordering Guide .......................................................................... 18

Rev. 0 | Page 2 of 20

ADA4062-2

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SPECIFICATIONS

ELECTRICAL CHARACTERISTICS

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

Table 2.

Parameter Symbol Conditions Min Typ Max Unit

INPUT CHARACTERISTICS

Offset Voltage VOS

B Grade 0.5 1.5 mV

−40°C ≤ TA ≤ +125°C 3 mV

A Grade 0.75 2.5 mV

−40°C ≤ TA ≤ +125°C 5 mV

Input Bias Current IB 2 50 pA

−40°C ≤ TA ≤ +125°C 5 nA

Input Offset Current IOS 0.5 25 pA

−40°C ≤ TA ≤ +125°C 2.5 nA

Input Voltage Range −40°C ≤ TA ≤ +125°C −11.5 +15 V
Common-Mode Rejection Ratio CMRR

B Grade VCM = −11.5 V to +11.5 V 80 90 dB

−40°C ≤ TA ≤ +125°C 80 dB

A Grade VCM = −11.5 V to +11.5 V 74 90 dB

−40°C ≤ TA ≤ +125°C 70 dB

Large-Signal Voltage Gain AVO R

−40°C ≤ TA ≤ +125°C 72 dB

Offset Voltage Drift ∆VOS/∆T −40°C ≤ TA ≤ +125°C 4 μV/°C
Input Resistance RIN 10 TΩ
Input Capacitance, Differential Mode C
Input Capacitance, Common Mode C

OUTPUT CHARACTERISTICS

Output Voltage High VOH R

−40°C ≤ TA ≤ +125°C 12.5 V

Output Voltage Low VOL R

−40°C ≤ TA ≤ +125°C −12.5 V

Short-Circuit Current ISC 20 mA
Closed-Loop Output Impedance Z

POWER SUPPLY

Power Supply Rejection Ratio PSRR

B Grade VSY = ±4 V to ±18 V 80 90 dB

−40°C ≤ TA ≤ +125°C 80 dB

A Grade VSY = ±4 V to ±18 V 74 90 dB

−40°C ≤ TA ≤ +125°C 70 dB

Supply Current per Amplifier ISY I

−40°C ≤ TA ≤ +125°C 220 μA

DYNAMIC PERFORMANCE

Slew Rate SR RL = 10 kΩ, CL = 100 pF, AV = 1 3.3 V/μs
Settling Time tS To 0.01%, VIN = 2 V step, CL = 100 pF, RL = 5 kΩ, AV = 1 3.5 μs
Gain Bandwidth Product GBP RL = 10 kΩ, AV = 1 1.4 MHz
Phase Margin ΦM R
Channel Separation CS f = 10 kHz 130 dB

NOISE PERFORMANCE

Voltage Noise en p-p f = 0.1 Hz to 10 Hz 1.5 μV p-p
Voltage Noise Density en f = 1 kHz 36 nV/√Hz
Current Noise Density in f = 1 kHz 5 fA/√Hz

1.5 pF

INDM

4.8 pF

INCM

f = 100 kHz, AV = 1 4 Ω

OUT

= 10 kΩ, VO = −10 V to +10 V 76 83 dB

L

= 10 kΩ to VCM 13 13.5 V

L

= 10 kΩ to VCM −13.8 −13 V

L

= 0 mA 165 200 μA

O

= 10 kΩ, AV = 1 80 Degrees

L

Rev. 0 | Page 3 of 20

ADA4062-2

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ABSOLUTE MAXIMUM RATINGS

Table 3.

Parameter Rating

Supply Voltage ±18 V
Input Voltage ±VSY
Differential Input Voltage ±VSY
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, 60 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. It was
measured using a standard 2-layer board.

Table 4. Thermal Resistance

Package Type θJA θ

8-Lead SOIC 158 43 °C/W
8-Lead MSOP 210 45 °C/W

Unit

JC

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 4 of 20

ADA4062-2

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TYPICAL PERFORMANCE CHARACTERISTICS

TA = 25°C, unless otherwise noted.

280

240

VSY = ±15V
V

= 0V

CM

70

60

VSY = ±5V
V

= 0V

CM

200

160

120

80

NUMBER OF AMPLI FERS

40

0

–3 –2 –1 0 1 2 3

VOS (mV)

Figure 3. Input Offset Voltage Distribution

40

VSY = ±15V
–40°C  T

30

20

NUMBER OF AMPLIFERS

10

 +125°C

A

50

40

30

20

NUMBER OF AMPLI FERS

10

0

–4 –3 –2 –1 0 1 2 43

07670-003

VOS (mV)

07670-054

Figure 6. Input Offset Voltage Distribution

40

VSY = ±5V
–40°C  T

30

20

NUMBER OF AMPLIFERS

10

 +125°C

A

0

–20246810

TCVOS (µV/°C)

Figure 4. Input Offset Voltage Drift Distribution

5

VSY = ±15V

4

3

2

1

0

(mV)

OS

V

–1

–2

–3

–4

–5

–15 –12 –9 –6 –3 0 3 6 9 12 15

VCM (V)

Figure 5. Input Offset Voltage vs. Common-Mode Voltage

07670-005

07670-006

Rev. 0 | Page 5 of 20

0

–20246810

TCVOS (µV/°C)

Figure 7. Input Offset Voltage Drift Distribution

5

= ±5V

V

SY

4

3

2

1

0

(mV)

OS

V

–1

–2

–3

–4

–5

–4 –3 –2 –1 0 1 2 3 4 5

VCM (V)

Figure 8. Input Offset Voltage vs. Common-Mode Voltage

07670-055

07670-056

ADA4062-2

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10000

VSY = ±15V

10000

VSY = ±5V

1000

100

(pA)

B

I

10

1

0.1
–50 –25 0 25 50 75 100 125

TEMPERATURE (° C)

Figure 9. Input Bias Current vs. Temperature

5

VSY = ±15V

4

3

(pA)

B

I

2

1000

100

(pA)

B

I

10

1

0.1
–50 –25 0 25 50 75 100 125

07670-009

TEMPERATURE (°C)

07670-012

Figure 12. Input Bias Current vs. Temperature

3

VSY = ±5V

2

1

(pA)

B

I

0

1

0

–12–10–8–6–4 –2 0 2 4 6 810121416

VCM (V)

Figure 10. Input Bias Current vs. Input Common-Mode Voltage

10

VSY = ±15V

VCC – V

OH

1

OUTPUT VOLTAGE TO SUPPLY RAIL (V)

0.1

0.01 0.1 1 10 100

VOL – V

EE

LOAD CURRENT (mA)

Figure 11. Output Voltage to Supply Rail vs. Load Current

–1

–2

–3–2–1012345

07670-010

VCM (V)

07670-013

Figure 13. Input Bias Current vs. Input Common-Mode Voltage

10

VSY = ±5V

VCC – V

OH

1

OUTPUT VOLTAGE TO SUPPLY RAIL (V)

0.1

0.01 0.1 1 10 100

07670-011

VOL – V

EE

LOAD CURRENT (mA)

07670-014

Figure 14. Output Voltage to Supply Rail vs. Load Current

Rev. 0 | Page 6 of 20