ANALOG DEVICES ADA4528-1 Service Manual

Precision, Ultralow Noise, RRIO,

–

Data Sheet

FEATURES

Low offset: 2.5 µV maximum Low offset voltage drift: 0.015 V/°C maximum Low noise

5.6 nV/√Hz at f = 1 kHz, A

97 nV p-p at f = 0.1 Hz to 10 Hz, A Open-loop voltage gain: 130 dB minimum CMRR: 135 dB minimum PSRR: 130 dB minimum Gain bandwidth product: 4 MHz Single-supply operation: 2.2 V to 5.5 V Dual-supply operation: ±1.1 V to ±2.75 V Rail-to-rail input and output Unity-gain stable

APPLICATIONS

Thermocouple/thermopile Load cell and bridge transducer Precision instrumentation Electronic scales Medical instrumentation Handheld test equipment

= +100

V

= +100

V

Zero-Drift Op Amp

ADA4528-1

PIN CONFIGURATIONS

NC

1

ADA4528-1

2

IN

TOP VIEW

3

+IN

(Not to Scale)

V–

4

NC = NO CONNECT. DO NOT

CONNECT TO THIS PIN.

Figure 1. 8-Lead MSOP

1NC

ADA4528-1

2–IN

TOP VIEW

3+IN

(Not to Scale)

4V–

NOTES

1. NC = NO CONNECT. DO NOT CONNECT TO THIS PIN.

2. IT I S RECOMMENDED T HAT THE EXPOSED PAD BE CONNECT ED TO V–.

Figure 2. 8-Lead LFCSP

NC

8

7

V+

6

OUT

NC

5

8NC

7V+

6OUT

5NC

09437-001

09437-102

GENERAL DESCRIPTION

The ADA4528-1 is an ultralow noise, zero-drift operational amplifier featuring rail-to-rail input and output swing. With an offset voltage of 2.5 V, offset voltage drift of 0.015 V/°C, and typical noise of 97 nV p-p (0.1 Hz to 10 Hz, A

ADA4528-1 is well suited for applications in which error sources

cannot be tolerated. The ADA4528-1 has a wide operating supply range of 2.2 V to

5.5 V, high gain, and excellent CMRR and PSRR specifications that make it ideal for precision amplification of low level signals, such as position and pressure sensors, strain gages, and medical instrumentation.

The ADA4528-1 is specified over the extended industrial temperature range (−40°C to +125°C) and is available in an 8-lead MSOP and an 8-lead LFCSP package.

For more information on the ADA4528-1, refer to AN-1114

Lowest Noise Zero-Drift Amplifier Has 5.6 nV/√Hz Voltage Noise Density.

= +100), the

V

Table 1. Analog Devices, Inc., Zero-Drift Op Amp Portfolio1

Typ e

Ultralow Noise

Micropower (<20 µA)

Low Power (<1 mA)

16 V Operating Voltage

Single ADA4528-1 ADA4051-1 AD8628 AD8638 AD8538 Dual ADA4051-2 AD8629 AD8639 AD8539 Quad AD8630

1

See www.analog.com for a selection of zero-drift operational amplifiers.

Rev. A

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.

ADA4528-1 Data Sheet

REVISION HISTORY

9/11—Rev. 0 to Rev. A

Added 8-Lead LFCSP_WD Package................................Universal

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

Added Figure 2; Renumbered Sequentially .................................. 1

Changes to Offset Voltage, Offset Voltage Drift, Power Supply Rejection Ratio, and Settling Time to 0.1% Parameters,

Table 2 ................................................................................................ 3

Changes to Thermal Resistance Section and Table 5................... 5

Changes to Figure 41 and Figure 44............................................. 12

Changes to Figure 45 and Figure 48............................................. 13

Updated Outline Dimensions....................................................... 18

Changes to Ordering Guide.......................................................... 18

1/11—Revision 0: Initial Version

ESD Caution...................................................................................5

Typical Performance Characteristics..............................................6

Applications Information.............................................................. 15

Input Protection ......................................................................... 15

Rail-to-Rail Input and Output.................................................. 15

Noise Considerations................................................................. 15

Printed Circuit Board Layout................................................... 17

Outline Dimensions....................................................................... 18

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

Rev. A | Page 2 of 20

Data Sheet ADA4528-1

SPECIFICATIONS

ELECTRICAL CHARACTERISTICS—2.5 V OPERATION

VS = 2.5 V, VCM = VSY/2 V, TA = 25°C, unless otherwise specified.

Table 2.

Parameter Symbol Test Conditions/Comments Min Typ Max Unit

INPUT CHARACTERISTICS

Offset Voltage VOS V

−40°C ≤ TA ≤ +125°C; MSOP package 4 V

−40°C ≤ TA ≤ +125°C; LFCSP package 4.3 V Offset Voltage Drift ∆VOS/∆T −40°C ≤ TA ≤ +125°C; MSOP package 0.002 0.015 V/°C

−40°C ≤ TA ≤ +125°C; LFCSP package 0.018 V/°C Input Bias Current IB 220 400 pA

−40°C ≤ TA ≤ +125°C 600 pA Input Offset Current IOS 440 800 pA

−40°C ≤ TA ≤ +125°C 1 nA Input Voltage Range 0 2.5 V Common-Mode Rejection Ratio CMRR VCM = 0 V to 2.5 V 135 158 dB

−40°C ≤ TA ≤ +125°C 116 dB Open-Loop Gain AVO R

−40°C ≤ TA ≤ +125°C 126 dB R

−40°C ≤ TA ≤ +125°C 121 dB Input Resistance, Differential Mode R Input Resistance, Common Mode R Input Capacitance, Differential Mode C Input Capacitance, Common Mode C

225 kΩ

INDM

1 GΩ

INCM

15 pF

INDM

30 pF

INCM

OUTPUT CHARACTERISTICS

Output Voltage High VOH R

−40°C ≤ TA ≤ +125°C 2.485 V R

−40°C ≤ TA ≤ +125°C 2.44 V Output Voltage Low VOL R

−40°C ≤ TA ≤ +125°C 15 mV R

−40°C ≤ TA ≤ +125°C 60 mV Short-Circuit Current ISC ±30 mA Closed-Loop Output Impedance Z

f = 1 kHz, AV = +10 0.1 Ω

OUT

POWER SUPPLY

Power Supply Rejection Ratio PSRR VSY = 2.2 V to 5.5 V 130 150 dB

−40°C ≤ TA ≤ +125°C 127 dB Supply Current/Amplifier ISY I

−40°C ≤ TA ≤ +125°C 2.1 mA DYNAMIC PERFORMANCE

Slew Rate SR RL = 10 kΩ, CL = 100 pF, AV = +1 0.45 V/s Settling Time to 0.1% ts V Gain Bandwidth Product

GBP R Phase Margin ΦM R Overload Recovery Time RL = 10 kΩ, CL = 100 pF, AV = −10 50 s

NOISE PERFORMANCE

Voltage Noise en p-p f = 0.1 Hz to 10 Hz, AV = +100 97 nV p-p Voltage Noise Density en f = 1 kHz, AV = +100 5.6 nV/√Hz f = 1 kHz, AV = +100, VCM = 2.0 V 5.5 nV/√Hz Current Noise in p-p f = 0.1 Hz to 10 Hz, AV = +100 10 pA p-p Current Noise Density in f = 1 kHz, AV = +100 0.7 pA/√Hz

= 0 V to 2.5 V 0.3 2.5 V

CM

= 10 kΩ, VO = 0.1 V to 2.4 V 130 140 dB

L

= 2 kΩ, VO = 0.1 V to 2.4 V 125 132 dB

L

= 10 kΩ to VCM 2.49 2.495 V

L

= 2 kΩ to VCM 2.46 2.48 V

L

= 10 kΩ to VCM 5 10 mV

L

= 2 kΩ to VCM 20 40 mV

L

= 0 mA 1.4 1.7 mA

O

= 1.5 V step, RL = 10 kΩ, CL = 100 pF, AV = −1 7 µs

IN

= 10 kΩ, CL = 100 pF, AV = +1

L

= 10 kΩ, CL = 100 pF, AV = +1 57 Degrees

L

4

MHz

Rev. A | Page 3 of 20

ADA4528-1 Data Sheet

ELECTRICAL CHARACTERISTICS—5 V OPERATION

VS = 5 V, VCM = VSY/2 V, TA = +25°C, unless otherwise specified.

Table 3.

Parameter Symbol Test Conditions/Comments Min Typ Max Unit

INPUT CHARACTERISTICS

Offset Voltage VOS V

−40°C ≤ TA ≤ +125°C 4 V Offset Voltage Drift ∆VOS/∆T −40°C ≤ TA ≤ +125°C 0.002 0.015 V/°C Input Bias Current IB 90 200 pA

−40°C ≤ TA ≤ +125°C 300 pA Input Offset Current IOS 180 400 pA

−40°C ≤ TA ≤ +125°C 500 pA Input Voltage Range 0 5 V Common-Mode Rejection Ratio CMRR VCM = 0 V to 5 V 137 160 dB

−40°C ≤ TA ≤ +125°C 122 dB Open-Loop Gain AVO R

−40°C ≤ TA ≤ +125°C 125 dB R

−40°C ≤ TA ≤ +125°C 120 dB Input Resistance, Differential Mode R Input Resistance, Common Mode R Input Capacitance, Differential Mode C Input Capacitance, Common Mode C

190 kΩ

INDM

1 GΩ

INCM

16.5 pF

INDM

33 pF

INCM

OUTPUT CHARACTERISTICS

Output Voltage High VOH R

−40°C ≤ TA ≤ +125°C 4.98 V R

−40°C ≤ TA ≤ +125°C 4.94 V Output Voltage Low VOL R

−40°C ≤ TA ≤ +125°C 20 mV R

−40°C ≤ TA ≤ +125°C 60 mV Short-Circuit Current ISC ±40 mA Closed-Loop Output Impedance Z

f = 1 kHz, AV = +10 0.1 Ω

OUT

POWER SUPPLY

Power Supply Rejection Ratio PSRR VSY = 2.2 V to 5.5 V 130 150 dB

−40°C ≤ TA ≤ +125°C 127 dB Supply Current/Amplifier ISY I

−40°C ≤ TA ≤ +125°C 2.2 mA DYNAMIC PERFORMANCE

Slew Rate SR RL = 10 kΩ, CL = 100 pF, AV = +1 0.5 V/s Settling Time to 0.1% ts V Gain Bandwidth Product

GBP R Phase Margin ΦM R Overload Recovery Time RL = 10 kΩ, CL = 100 pF, AV = −10 50 s

NOISE PERFORMANCE

Voltage Noise en p-p f = 0.1 Hz to 10 Hz, AV = +100 99 nV p-p Voltage Noise Density en f = 1 kHz, AV = +100 5.9 nV/√Hz f = 1 kHz, AV = +100, VCM = 4.5 V 5.3 nV/√Hz Current Noise in p-p f = 0.1 Hz to 10 Hz, AV = +100 10 pA p-p Current Noise Density in f = 1 kHz, AV = +100 0.5 pA/√Hz

= 0 V to 5 V 0.3 2.5 V

CM

= 10 kΩ, VO = 0.1 V to 4.9 V 127 139 dB

L

= 2 kΩ, VO = 0.1 V to 4.9 V 121 131 dB

L

= 10 kΩ to VCM 4.99 4.995 V

L

= 2 kΩ to VCM 4.96 4.98 V

L

= 10 kΩ to VCM 5 10 mV

L

= 2 kΩ to VCM 20 40 mV

L

= 0 mA 1.5 1.8 mA

O

= 4 V step, RL = 10 kΩ, CL = 100 pF, AV = −1 10 µs

IN

= 10 kΩ, CL = 100 pF, AV = +1

L

= 10 kΩ, CL = 100 pF, AV = +1 57 Degrees

L

4

MHz

Rev. A | Page 4 of 20

Data Sheet ADA4528-1

ABSOLUTE MAXIMUM RATINGS

Table 4.

Parameter Rating

Supply Voltage 6 V Input Voltage ±VSY ± 0.3 V Input Current1 ±10 mA 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

1

The input pins have clamp diodes to the power supply pins. Limit the

input current to 10 mA or less whenever input signals exceed the power supply rail by 0.5 V.

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. This was measured using a 4-layer JEDEC thermal board with the exposed pad soldered to the PCB.

Table 5. Thermal Resistance

Package Type θJA θ

8-Lead MSOP (RM-8) 142 45 °C/W 8-Lead LFCSP (CP-8-12) 80 14 °C/W

Unit

JC

ESD CAUTION

Rev. A | Page 5 of 20

ADA4528-1 Data Sheet

TYPICAL PERFORMANCE CHARACTERISTICS

TA = 25°C, unless otherwise noted.

100

VSY = 2.5V

90

V

CM

80

70

60

50

40

30

NUMBER OF AMPLI FIERS

20

10

0

–1.0 –0.6

–0.8 –0.4

60

= VSY/2

00.6

0.2

–0.2

VOS (µV)

0.4 0.8

Figure 3. Input Offset Voltage Distribution

1.0

09437-002

100

VSY = 5V

90

V

CM

80

70

60

50

40

30

NUMBER OF AMPLI FIERS

20

10

0

–1.0 –0.6

–0.8 –0.4

60

= VSY/2

00.6

0.2

–0.2

VOS (µV)

0.4 0.8

Figure 6. Input Offset Voltage Distribution

1.0

09437-005

50

40

30

20

NUMBER OF AMPLI FIERS

10

0

09631

TCVOS (nV/°C)

VSY = 2.5V

= VSY/2

V

CM

215

09437-003

Figure 4. Input Offset Voltage Drift Distribution

1.0 VSY = 2.5V

0.8

0.6

0.4

0.2

(µV)

0

OS

V

–0.2

–0.4

–0.6

–0.8

–1.0

00.5

1.0 VCM (V)

1.5

2.0

2.5

09437-004

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

50

40

30

20

NUMBER OF AMPLI FIERS

10

0

09631

TCV

OS

(nV/°C)

VSY = 5V

= VSY/2

V

CM

215

09437-006

Figure 7. Input Offset Voltage Drift Distribution

1.0 VSY = 5V

0.8

0.6

0.4

0.2

(µV)

0

OS

V

–0.2

–0.4

–0.6

–0.8

–1.0

01

2

VCM (V)

3

4

5

09437-007

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

Rev. A | Page 6 of 20

ANALOG DEVICES ADA4528-1 Service Manual

FEATURES

APPLICATIONS

PIN CONFIGURATIONS

GENERAL DESCRIPTION

TABLE OF CONTENTS

REVISION HISTORY

SPECIFICATIONS

ELECTRICAL CHARACTERISTICS—2.5 V OPERATION

ELECTRICAL CHARACTERISTICS—5 V OPERATION

ABSOLUTE MAXIMUM RATINGS

THERMAL RESISTANCE

ESD CAUTION

TYPICAL PERFORMANCE CHARACTERISTICS