Analog Devices AD8615, AD8616, AD8618 Service Manual

Precision, 20 MHz, CMOS, Rail-to-Rail

FEATURES

Low offset voltage: 65 μV max Single-supply operation: 2.7 V to 5.5 V Low noise: 8 nV/√Hz Wide bandwidth: >20 MHz Slew rate: 12 V/μs High output current: 150 mA No phase reversal Low input bias current: 1 pA Low supply current: 2 mA Unity-gain stable

APPLICATIONS

Barcode scanners Battery-powered instrumentation Multipole filters Sensors ASIC input or output amplifier Audio Photodiode amplification

GENERAL DESCRIPTION

The AD8615/AD8616/AD8618 are dual/quad, rail-to-rail, input and output, single-supply amplifiers featuring very low offset voltage, wide signal bandwidth, and low input voltage and

Input/Output Operational Amplifiers

AD8615/AD8616/AD8618

current noise. The parts use a patented trimming technique that achieves superior precision without laser trimming. The AD8615/AD8616/AD8618 are fully specified to operate from 2.7 V to 5 V single supplies.

The combination of 20 MHz bandwidth, low offset, low noise, and very low input bias current make these amplifiers useful in a wide variety of applications. Filters, integrators, photodiode amplifiers, and high impedance sensors all benefit from the combination of performance features. AC applications benefit from the wide bandwidth and low distortion. The AD8615/AD8616/AD8618 offer the highest output drive capability of the DigiTrim line drivers and other low impedance applications.

Applications for the parts include portable and low powered instrumentation, audio amplification for portable devices, portable phone headsets, bar code scanners, and multipole filters. The ability to swing rail-to-rail at both the input and output enables designers to buffer CMOS ADCs, DACs, ASICs, and other wide output swing devices in single-supply systems.

The AD8615/AD8616/AD8618 are specified over the extended industrial (–40°C to +125°C) temperature range. The AD8615 is available in 5-lead TSOT-23 packages. The AD8616 is available in 8-lead MSOP and narrow SOIC surface-mount packages; the MSOP version is available in tape and reel only. The AD8618 is available in 14-lead SOIC and TSSOP packages.

TM

family, which is excellent for audio

PIN CONFIGURATIONS

5

4

8 7 6 5

V+

–IN

V+ OUT B –IN B +IN B

04648-B-050

04648-0-001

04648-0-002

1

OUT

AD8615

V–

2

TOP VIEW

(Not to Scale)

+IN

3

Figure 1. 5-Lead TSOT-23 (UJ-5)

OUT A

1

AD8616

2

–IN A +IN A

3

TOP VIEW

(Not to Scale)

V–

4

Figure 2. 8-Lead MSOP (RM-8)

OUT A

1

V–

AD8616

2 3

TOP VIEW

(Not to Scale)

4

–IN A +IN A

Figure 3. 8-Lead SOIC (R-8)

Rev. C

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.

OUT A

–IN A +IN A

+IN B –IN B

OUT B

1

V+

AD8618

7

OUT D

14

–IN D +IN D V– +IN C –IN C

8

OUT C

04648-0-048

Figure 4. 14-Lead TSSOP (RU-14)

OUT A

–

IN A

+IN A

+IN B –IN B

OUT B

1

2

3

AD8618

4

V+

5

6

7

14

13

12

11

10

9

8

OUT D –IN D +IN D V– +IN C –IN C OUT C

04648-0-049

Figure 5. 14-Lead SOIC (R-14)

AD8615/AD8616/AD8618

TABLE OF CONTENTS

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

Absolute Maximum Ratings............................................................ 5

Thermal Resistance ...................................................................... 5

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

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

Applications..................................................................................... 11

Input Overvoltage Protection................................................... 11

Output Phase Reversal............................................................... 11

Driving Capacitive Loads.......................................................... 11

REVISION HISTORY

6/05—Rev. B to Rev. C

Change to Table 1 .........................................................................3

Change to Table 2 .........................................................................4

Change to Figure 20 ..................................................................... 8

1/05—Rev. A to Rev. B

Added AD8615 ...............................................................Universal

Changes to Figure 12.................................................................... 8

Deleted Figure 19; Renumbered Subsequent Figures.............. 8

Changes to Figure 20.................................................................... 9

Changes to Figure 29.................................................................. 10

Changes to Figure 31.................................................................. 11

Deleted Figure 34; Renumbered Subsequent Figures............ 11

Deleted Figure 35; Renumbered Subsequent Figures............ 35

Overload Recovery Time .......................................................... 12

D/A Conversion ......................................................................... 12

Low Noise Applications............................................................. 12

High Speed Photodiode Preamplifier...................................... 13

Active Filters ............................................................................... 13

Power Dissipation....................................................................... 13

Power Calculations for Varying or Unknown Loads............. 14

Outline Dimensions .......................................................................15

Ordering Guide .......................................................................... 17

4/04—Rev. 0 to Rev. A

Added AD8618 ...............................................................Universal

Updated Outline Dimensions................................................... 16

1/04—Revision 0: Initial Version

Rev. C | Page 2 of 20

AD8615/AD8616/AD8618

SPECIFICATIONS

VS =5 V, VCM = VS/2, TA = 25°C, unless otherwise noted.

Table 1.

Parameter Symbol Conditions Min Typ Max Unit

INPUT CHARACTERISTICS

Offset Voltage AD8616/AD8618/

V

OS

AD8615

V

−40°C < TA < +125°C 800 μV /∆T −40°C < TA < +125°C

Offset Voltage Drift AD8616/AD8618/

∆V

OS

AD8615

Input Bias Current I

B

−40°C < TA < +85°C 50 pA

−40°C < TA < +125°C 550 pA

Input Offset Current I

OS

−40°C < TA < +85°C 50 pA

−40°C < TA < +125°C 250 pA

Input Voltage Range 0 5 V Common-Mode Rejection Ratio CMRR VCM = 0 V to 4.5 V 80 100 dB Large Signal Voltage Gain A Input Capacitance C

C

VO

DIFF

CM

OUTPUT CHARACTERISTICS

Output Voltage High V

OH

I

−40°C < TA < +125°C 4.7 V Output Voltage Low V

OL

I

−40°C < TA < +125°C 200 mV

Output Current I Closed-Loop Output Impedance Z

OUT

POWER SUPPLY

Power Supply Rejection Ratio PSRR VS = 2.7 V to 5.5 V 70 90 dB Supply Current per Amplifier I

SY

−40°C < TA < +125°C 2.5 mA

DYNAMIC PERFORMANCE

Slew Rate SR RL = 2 kΩ 12 V/μs Settling Time t

s

Gain Bandwidth Product GBP 24 MHz Phase Margin Ø

m

NOISE PERFORMANCE

Peak-to-Peak Noise en p-p 0.1 Hz to 10 Hz 2.4 μV Voltage Noise Density e

n

f = 10 kHz 7 nV/√Hz

Current Noise Density i

n

Channel Separation Cs f = 10 kHz –115 dB

f = 100 kHz –110 dB

VS = 3.5 V at VCM = 0.5 V and 3.0 V

= 0 V to 5 V 80 500 μV

CM

23 23

1.5 3

60 100

7 10

μV μV

μV/°C μV/°C

0.2 1 pA

0.1 0.5 pA

RL = 2 kΩ, VO = 0.5 V to 5 V 105 1500 V/mV

2.5 pF

6.7 pF

IL = 1 mA 4.98 4.99 V

= 10 mA 4.88 4.92 V

L

IL = 1 mA 7.5 15 mV

= 10 mA 70 100 mV

L

±150 mA f = 1 MHz, AV = 1 3 Ω

VO = 0 V 1.7 2.0 mA

To 0.01% <0.5 μs

63 Degrees

f = 1 kHz 10 nV/√Hz

f = 1 kHz 0.05 pA/√Hz

Rev. C | Page 3 of 20

AD8615/AD8616/AD8618

VS = 2.7 V, VCM = VS/2, TA = 25°C, unless otherwise noted.

Table 2.

Parameter Symbol Conditions Min Typ Max Unit

INPUT CHARACTERISTICS

Offset Voltage AD8616/AD8618/

V

OS

AD8615

V

−40°C < TA < +125°C 800 μV /∆T −40°C < TA < +125°C

Offset Voltage Drift AD8616/AD8618/

∆V

OS

AD8615

Input Bias Current I

B

−40°C < TA < +85°C 50 pA

−40°C < TA < +125°C 550 pA

Input Offset Current I

OS

−40°C < TA < +85°C 50 pA

−40°C < TA < +125°C 250 pA

Input Voltage Range 0 2.7 V Common-Mode Rejection Ratio CMRR VCM = 0 V to 2.7 V 80 100 dB Large Signal Voltage Gain A Input Capacitance C

C

VO

DIFF

CM

OUTPUT CHARACTERISTICS

Output Voltage High V

OH

−40°C < TA < +125°C 2.6 V

Output Voltage Low V

OL

−40°C < TA < +125°C 30 mV

Output Current I Closed-Loop Output Impedance Z

OUT

POWER SUPPLY

Power Supply Rejection Ratio PSRR VS = 2.7 V to 5.5 V 70 90 dB Supply Current per Amplifier I

SY

−40°C < TA < +125°C 2.5 mA

DYNAMIC PERFORMANCE

Slew Rate SR RL = 2 kΩ 12 V/μs Settling Time t

s

Gain Bandwidth Product GBP 23 MHz Phase Margin Ø

m

NOISE PERFORMANCE

Peak-to-Peak Noise en p-p 0.1 Hz to 10 Hz 2.1 μV Voltage Noise Density e

n

f = 10 kHz 7 nV/√Hz Current Noise Density i

n

Channel Separation Cs f = 10 kHz –115 dB

f = 100 kHz –110 dB

VS = 3.5 V at VCM = 0.5 V and 3.0 V

= 0 V to 2.7 V 80 500 μV

CM

23 23

1.5 3

65 100

7 10

μV μV

μV/°C μV/°C

0.2 1 pA

0.1 0.5 pA

RL = 2 kΩ, VO = 0.5 V to 2.2 V 55 150 V/mV

2.5 pF

7.8 pF

IL = 1 mA 2.65 2.68 V

IL = 1 mA 11 25 mV

±50 mA f = 1 MHz, AV = 1 3 Ω

VO = 0 V 1.7 2 mA

To 0.01% < 0.3 μs

42 Degrees

f = 1 kHz 10 nV/√Hz

f = 1 kHz 0.05 pA/√Hz

Rev. C | Page 4 of 20

AD8615/AD8616/AD8618

ABSOLUTE MAXIMUM RATINGS

Table 3.

Parameter Rating

Supply Voltage 6 V Input Voltage GND to V Differential Input Voltage ±3 V Output Short-Circuit Duration to GND Indefinite Storage Temperature –65°C to +150°C Operating Temperature Range –40°C to +125°C Lead Temperature Range (Soldering 60 sec) 300°C Junction Temperature 150°C

S

Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. This is a stress rating only and 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.

ESD CAUTION

ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on the human body and test equipment and can discharge without detection. Although this product features proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance degradation or loss of functionality.

THERMAL RESISTANCE

θJA is specified for the worst-case conditions, that is, θJA is specified for device soldered in circuit board for surface-mount packages.

Table 4.

Package Type θ

5–Lead TSOT-23 (UJ) 207 61 °C/W 8-Lead MSOP (RM) 210 45 °C/W 8-Lead SOIC (R) 158 43 °C/W 14-Lead SOIC (R) 120 36 °C/W 14-Lead TSSOP (RU) 180 35 °C/W

JA

θ

Unit

JC

Rev. C | Page 5 of 20

AD8615/AD8616/AD8618

TYPICAL PERFORMANCE CHARACTERISTICS

2200

VS = 5V

2000

T

=25°C

A

V

= 0V TO 5V

CM

1800 1600 1400 1200 1000

800 600

NUMBER OF AMPLIFIERS

400 200

0

–700 –500 –300 –100 100 300 500 700

μ

OFFSET VOLTAGE (

Figure 6. Input Offset Voltage Distribution

V)

04648-0-003

350

VS = ±2.5V

300

250

200

150

100

INPUT BIAS CURRENT (pA)

50

0

0 25 50 75 100 125

TEMPERATURE (°C)

Figure 9. Input Bias Current vs. Temperature

04648-0-006

22

OS

(μV/°C)

VS = ±2.5V T

=–40°CTO+125°C

A

V

= 0V

CM

NUMBER OF AMPLIFIERS

20 18 16 14 12 10

8 6 4 2 0

024681012

TCV

Figure 7. Offset Voltage Drift Distribution

500

VS = 5V

400

T

=25°C

A

300

V)

μ

200

100

0

–100

–200

INPUT OFFSET VOLTAGE (

–300

–400

–500

0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0

COMMON-MODE VOLTAGE (V)

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

(200 Units, Five Wafer Lots Including Process Skews)

04648-0-004

04648-0-005

1000

VS = 5V

= 25°C

T

A

100

(mV)

10

OUT

–V

SY

V

1

0.1

0.001 0.01 0.1 1 10

SOURCE

I

LOAD

SINK

(mA)

Figure 10. Output Voltage to Supply Rail vs. Load Current

120

VS = 5V

100

80

60

40

OUTPUT VOLTAGE (mV)

20

1mA LOAD

0

–40 –25 –10 5 20 35 50 65 80 95 110 125

10mA LOAD

TEMPERATURE (

°

C)

Figure 11. Output Saturation Voltage vs. Temperature

100

04648-B-007

04648-0-008

Rev. C | Page 6 of 20