Analog Devices AD8615 6 8 b Datasheet

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/√

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

Hz

Input/Output Operational Amplifiers

AD8615/AD8616/AD8618

PIN CONFIGURATIONS

V+

OUT

1

AD8615

V–

2

TOP VIEW

(Not to Scale)

3

+IN

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)

OUT A

–

+IN A
+IN B

–

OUT B

IN A

IN B

1

AD8618

V+

7

Figure 4.14-Lead TSSOP (RU-14)

5

–IN

4

04648-B-050

V+

8
7

OUT B
–IN B

6

+IN B

5

04648-0-001

V+

8

OUT B

7

–IN B

6
5

+IN B

04648-0-002

OUT D

14

–

IN D

+IN D

–

V
+IN C

–

IN C

8

OUT C

04648-0-048

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
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.

Rev. B

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

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)

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.

(continued on Page 3)

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: [phone]
Fax: [phone] © 2005 Analog Devices, Inc. All rights reserved.

www.analog.com

AD8615/AD8616/AD8618

TABLE OF CONTENTS

General Description......................................................................... 3

Specifications..................................................................................... 4

V

= 5 V.......................................................................................... 4

S

V

= 2.7 V....................................................................................... 5

S

Absolute Maximum Ratings............................................................ 6

Thermal Resistance ...................................................................... 6

ESD Caution.................................................................................. 6

Typical Performance Characteristics............................................. 7

Applications..................................................................................... 12

Input Overvoltage Protection................................................... 12

Output Phase Reversal............................................................... 12

REVISION HISTORY

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

Driving Capacitive Loads.......................................................... 12

Overload Recovery Time .......................................................... 13

D/A Conversion ......................................................................... 13

Low Noise Applications............................................................. 13

High Speed Photodiode Preamplifier...................................... 14

Active Filters ............................................................................... 14

Power Dissipation....................................................................... 14

Power Calculations for Varying or Unknown Loads............. 15

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

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

4/04—Rev. 0 to Rev. A

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

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

1/04—Revision 0: Initial Version

Rev. B | Page 2 of 20

AD8615/AD8616/AD8618

GENERAL DESCRIPTION

(continued from Page 1)

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.

TM

family, which is excellent for audio

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. 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 14-lead TSSOP packages.

Rev. B | Page 3 of 20

AD8615/AD8616/AD8618

SPECIFICATIONS

VS = 5 V

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

Table 1.

Parameter Symbol Conditions Min Typ Max Unit

INPUT CHARACTERISTICS

Offset Voltage AD8616/AD8618

AD8615

V

−40°C < TA < +125°C 800 µV

Offset Voltage Drift AD8616/AD8618

AD8615

Input Bias Current I

−40°C < TA < +85°C 50 pA

−40°C < TA < +125°C 550 pA

Input Offset Current I

−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
OUTPUT CHARACTERISTICS

Output Voltage High V
I

−40°C < TA < +125°C 4.7 V

Output Voltage Low V
I

−40°C < TA < +125°C 200 mV

Output Current I

Closed-Loop Output Impedance Z
POWER SUPPLY

Power Supply Rejection Ratio PSRR VS = 2.7 V to 5.5 V 70 90 dB

Supply Current per Amplifier I

−40°C < TA < +125°C 2.5 mA

DYNAMIC PERFORMANCE

Slew Rate SR RL = 2 kΩ 12 V/µs

Settling Time t

Gain Bandwidth Product GBP 24 MHz

Phase Margin Ø
NOISE PERFORMANCE

Peak-to-Peak Noise en p-p 0.1 Hz to 10 Hz 2.4 µV

Voltage Noise Density e
f = 10 kHz 6

Current Noise Density i

Channel Separation Cs f = 10 kHz –115 dB
f = 100 kHz –110 dB

V

OS

VS = 3.5 V at VCM = 0.5 V and 3.0 V 23

23

= 0 V to 5 V 80 500 µV

CM

∆VOS/∆T −40°C < TA < +125°C 1.5

3

B

OS

VO

DIFF

CM

OH

OL

OUT

OUT

SY

s

m

n

n

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 8

f = 1 kHz 0.05

60
100

7
10

µV
µV

µV/°C
µV/°C

nV/√
nV/√
pA/√

Hz
Hz
Hz

Rev. B | Page 4 of 20

AD8615/AD8616/AD8618

VS = 2.7 V

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

Table 2.

Parameter Symbol Conditions Min Typ Max Unit

INPUT CHARACTERISTICS

Offset Voltage AD8616/18

AD8615

V

−40°C < TA < +125°C 800 µV
Offset Voltage Drift AD8616/18

AD8615

Input Bias Current I

−40°C < TA < +85°C 50 pA

−40°C < TA < +125°C 550 pA
Input Offset Current I

−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
OUTPUT CHARACTERISTICS

Output Voltage High V

−40°C < TA < +125°C 2.6 V
Output Voltage Low V

−40°C < TA < +125°C 30 mV
Output Current I
Closed-Loop Output Impedance Z

POWER SUPPLY

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

−40°C < TA < +125°C 2.5 mA

DYNAMIC PERFORMANCE

Slew Rate SR RL = 2 kΩ 12 V/µs
Settling Time t
Gain Bandwidth Product GBP 23 MHz
Phase Margin Ø

NOISE PERFORMANCE

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

f = 10 kHz 6
Current Noise Density i
Channel Separation Cs f = 10 kHz –115 dB

f = 100 kHz –110 dB

V

OS

VS = 3.5 V at VCM = 0.5 V and 3.0 V 23

23

= 0 V to 2.7 V 80 500 µV

CM

∆VOS/∆T −40°C < TA < +125°C 1.5

3

B

OS

VO

DIFF

CM

OH

OL

OUT

OUT

SY

s

m

n

n

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 8

f = 1 kHz 0.05

65
100

7
10

µV
µV

µV/°C
µV/°C

nV/√
nV/√
pA/√

Hz
Hz
Hz

Rev. B | Page 5 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
Ouput 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; 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, i.e., 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

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.

Rev. B | Page 6 of 20