ANALOG DEVICES ADA4896-2, ADA4897-1, ADA4897-2 Service Manual

1 nV/√Hz, Low Power,

–

Data Sheet

FEATURES

Low wideband noise

1 nV/√Hz

2.8 pA/√Hz
Low 1/f noise: 2.4 nV/√Hz at 10 Hz
Low distortion: −115 dBc at 100 kHz, V
Low power: 3 mA per amplifier
Low input offset voltage: 0.5 mV maximum
High speed

−3 dB bandwidth: 230 MHz (G = +1)

Slew rate: 120 V/μs

Settling time to 0.1%: 45 ns
Rail-to-rail output
Wide supply range: 3 V to 10 V
Disable feature (ADA4897-1/ADA4897-2)

APPLICATIONS

Low noise preamplifier
Ultrasound amplifiers
PLL loop filters
High performance ADC drivers
DAC buffers

GENERAL DESCRIPTION

The ADA4896-2/ADA4897-1/ADA4897-2 are unity-gain stable,
low noise, rail-to-rail output, high speed voltage feedback amplifiers
that have a quiescent current of 3 mA. With a 1/f noise of

2.4 nV/√Hz at 10 Hz and a spurious-free dynamic range of −80 dBc
at 2 MHz, the ADA4896-2/ADA4897-1/ADA4897-2 are ideal
solutions in a variety of applications, including ultrasound, low
noise preamplifiers, and drivers of high performance ADCs. The
Analog Devices, Inc., proprietary next-generation SiGe bipolar
process and innovative architecture enable such high performance
amplifiers.

The ADA4896-2/ADA4897-1/ADA4897-2 have 230 MHz
bandwidth, 120 V/μs slew rate, and settle to 0.1% in 45 ns.
With a wide supply voltage range of 3 V to 10 V, the ADA4896-2/

ADA4897-1/ADA4897-2 are ideal candidates for systems that

require high dynamic range, precision, low power, and high speed.
The ADA4896-2 is available in 8-lead LFCSP and 8-lead MSOP

packages. The ADA4897-1 is available in 8-lead SOIC and 6-lead
SOT-23 packages. The ADA4897-2 is available in a 10-lead MSOP
package. The ADA4896-2/ADA4897-1/ADA4897-2 operate over
the extended industrial temperature range of −40°C to +125°C.

= 2 V p-p

OUT

Rail-to-Rail Output Amplifiers

ADA4896-2/ADA4897-1/ADA4897-2

FUNCTIONAL BLOCK DIAGRAM

1

NC

–IN

2

3

+IN

4

V

S

Figure 1. 8-Lead SOIC (ADA4897-1)

8

VS = ±5V

7

6

5

4

3

VOLTAGE NOISE (nV/√Hz)

2

1

0

1 10 100 1k 10k 100k 1M 5M

FREQUENC Y (Hz)

Figure 2. Voltage Noise vs. Frequency

Table 1. Other Low Noise Amplifiers

V
Part No. At 1 kHz At 100 kHz BW (MHz) Voltage (V)

AD797 0.9 0.9 8 10 to 30
AD8021 5 2.1 490 5 to 24
AD8099 3 0.95 510 5 to 12
AD8045 6 3 1000 3.3 to 12
ADA4899-1 1.4 1 600 5 to 12
ADA4898-1/

0.9 0.9 65 10 to 32

ADA4898-2

(nV/√Hz) Supply

N

Table 2. Complementary ADCs

Part No. Bits Speed (MSPS) Power (mW)

AD7944 14 2.5 15.5
AD7985 16 2.5 15.5
AD7986 18 2 15

8

DISABLE

+V

7

6

OUT

NC

5

S

09447-101

09447-102

Rev. B

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ADA4896-2/ADA4897-1/ADA4897-2 Data Sheet

TABLE OF CONTENTS

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

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

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

Functional Block Diagram .............................................................. 1

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

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

±5 V Supply ................................................................................... 3

+5 V Supply ................................................................................... 4

+3 V Supply ................................................................................... 6

Absolute Maximum Ratings ............................................................ 8

Thermal Resistance ...................................................................... 8

Maximum Power Dissipation ..................................................... 8

ESD Caution .................................................................................. 8

Pin Configurations and Function Descriptions ........................... 9

Typical Performance Characteristics ........................................... 11

Theory of Operation ...................................................................... 17

Amplifier Description ................................................................ 17

Input Protection ......................................................................... 17

Disable Operation ...................................................................... 17

DC Errors .................................................................................... 18

Bias Current Cancellation ......................................................... 18

Noise Considerations ................................................................. 19

Capacitance Drive ...................................................................... 19

Applications Information .............................................................. 20

Typical Performance Values ...................................................... 20

Low Noise, Gain Selectable Amplifier ..................................... 21

Medical Ultrasound Applications ............................................ 22

Layout Considerations ............................................................... 24

Outline Dimensions ....................................................................... 25

Ordering Guide .......................................................................... 27

REVISION HISTORY

4/12—Rev. A to Rev. B

Changed 6-Lead Single SOT-23 (ADA4897-1) Thermal

Reistance from 306°C/W to 150°C/W ........................................... 8

Changes to Figure 3 .......................................................................... 8

10/11—Rev. 0 to Rev. A

Added ADA4897-2 and 10-Lead MSOP ......................... Universal

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

Changes to Table 3 ............................................................................ 3

Changes to Table 4 ............................................................................ 4

Changes to Table 5 ............................................................................ 6

Changes to Table 7 and Figure 3 ..................................................... 8

Changes to Figure 4, Table 8, and Table 9 ..................................... 9

Added Figure 8 and Table 10; Renumbered Sequentially ......... 10

Changed Summary Statement for Typical Performance

Characteristics Section ................................................................... 11

Changes to Figure 18 ...................................................................... 12

Change to Figure 20 ....................................................................... 12

Change to Figure 26; Moved Figure 26........................................ 13

Changes to Figure 37 ...................................................................... 15

Changes to Amplifier Description Section, Disable Operation

Section, Figure 44, and Figure 45 ................................................. 17

Added Bias Current Cancellation Section, Figure 47,

Table 11, and Table 12 .................................................................... 18

Changes to Table 13 ....................................................................... 20

Changes to Low Noise, Gain Selectable Amplifier Section

and Figure 52 ................................................................................... 21

Deleted Figure 51 ............................................................................ 22

Changes to Power Supply Bypassing Section ............................. 24

Moved Figure 57 ............................................................................. 25

Moved Figure 58 ............................................................................. 26

Added Figure 60 ............................................................................. 27

Changes to Ordering Guide .......................................................... 27

7/11—Revision 0: Initial Version

Rev. B | Page 2 of 28

Data Sheet ADA4896-2/ADA4897-1/ADA4897-2

B

SPECIFICATIONS

±5 V SUPPLY

TA = 25°C, G = +1, RL = 1 kΩ to ground, unless otherwise noted.

Table 3.

Parameter Test Conditions/Comments Min Typ Max Unit

DYNAMIC PERFORMANCE

−3 dB Bandwidth G = +1, V
G = +1, V
G = +2, V

Bandwidth for 0.1 dB Flatness G = +2, V
Slew Rate G = +2, V
Settling Time to 0.1% G = +2, V
Settling Time to 0.01% G = +2, V

NOISE/HARMONIC PERFORMANCE

Harmonic Distortion (SFDR) V

f
f
f
f

OUT

= 100 kHz −115 dBc

C

= 1 MHz −93 dBc

C

= 2 MHz −80 dBc

C

= 5 MHz −61 dBc

C

Input Voltage Noise f = 10 Hz 2.4 nV/√Hz

f = 100 kHz 1 nV/√Hz

Input Current Noise f = 10 Hz 11 pA/√Hz

f = 100 kHz 2.8 pA/√Hz

0.1 Hz to 10 Hz Noise G = +101, RF = 1 kΩ, RG = 10 Ω 99 nV p-p

DC PERFORMANCE

Input Offset Voltage −500 −28 +500 μV

Input Offset Voltage Drift 0.2 μV/°C

Input Bias Current −17 −11 −4 μA

Input Bias Current Drift 3 nA/°C

Input Bias Offset Current −0.6 −0.02 +0.6 μA

Open-Loop Gain V

OUT

INPUT CHARACTERISTICS

Input Resistance

Common-Mode 10 MΩ
Differential 10 kΩ

Input Capacitance

Common-Mode 3 pF
Differential 11 pF

Input Common-Mode Voltage Range −4.9 to +4.1 V

= −2 V to +2 V −92 −120 dB

Common-Mode Rejection Ratio

V

CM

(CMRR)

OUTPUT CHARACTERISTICS

Output Overdrive Recovery Time VIN = ±5 V, G = +2 81 ns

Output Voltage Swing

Positive RL = 1 kΩ 4.85 4.96 V

R

= 100 Ω 4.5 4.73 V

L

Negative RL = 1 kΩ −4.85 −4.97 V

R

= 100 Ω −4.5 −4.84 V

L

Output Current SFDR = −45 dBc 80 mA

Short-Circuit Current Sinking/sourcing 135 mA

Capacitive Load Drive 30% overshoot, G = +2 39 pF

= 0.02 V p-p 230 MHz

OUT

= 2 V p-p 30 MHz

OUT

= 0.02 V p-p 90 MHz

OUT

= 2 V p-p, RL = 100 Ω 7 MHz

OUT

= 6 V step 120 V/μs

OUT

= 2 V step 45 ns

OUT

= 2 V step 90 ns

OUT

= 2 V p-p

= −4 V to +4 V 100 110 dB

Rev. | Page 3 of 28

ADA4896-2/ADA4897-1/ADA4897-2 Data Sheet

B

Parameter Test Conditions/Comments Min Typ Max Unit

POWER SUPPLY

Operating Range 3 to 10 V
Quiescent Current per Amplifier 2.8 3.0 3.2 mA

DISABLE

= −5 V

Power Supply Rejection Ratio (PSRR)

Positive +VS = 4 V to 6 V, −VS = −5 V −96 −125 dB
Negative +VS = 5 V, −VS = −4 V to −6 V −96 −121 dB

DISABLE PIN ( / ) ADA4897-1 ADA4897-2

DISABLE Voltage

Enabled >+V

Disabled <+VS − 2 V

Input Current

Enabled
Disabled

DISABLE
DISABLE

= +5 V
= −5 V

Switching Speed

Enabled 0.25 μs
Disabled 12 μs

+5 V SUPPLY

TA = 25°C, G = +1, RL = 1 kΩ to midsupply, unless otherwise noted.

0.13 0.25 mA

− 0.5 V

S

−1.2 μA

−40 μA

Table 4.

Parameter Test Conditions/Comments Min Typ Max Unit

DYNAMIC PERFORMANCE

−3 dB Bandwidth G = +1, V
G = +1, V
G = +2, V

Bandwidth for 0.1 dB Flatness G = +2, V
Slew Rate G = +2, V
Settling Time to 0.1% G = +2, V
Settling Time to 0.01% G = +2, V

= 0.02 V p-p 230 MHz

OUT

= 2 V p-p 30 MHz

OUT

= 0.02 V p-p 90 MHz

OUT

= 2 V p-p, RL = 100 Ω 7 MHz

OUT

= 3 V step 100 V/μs

OUT

= 2 V step 45 ns

OUT

= 2 V step 95 ns

OUT

NOISE/HARMONIC PERFORMANCE

Harmonic Distortion (SFDR) V

f
f
f
f

= 2 V p-p

OUT

= 100 kHz −115 dBc

C

= 1 MHz −93 dBc

C

= 2 MHz −80 dBc

C

= 5 MHz −61 dBc

C

Input Voltage Noise f = 10 Hz 2.4 nV/√Hz

f = 100 kHz 1 nV/√Hz

Input Current Noise f = 10 Hz 11 pA/√Hz

f = 100 kHz 2.8 pA/√Hz

0.1 Hz to 10 Hz Noise G = +101, RF = 1 kΩ, RG = 10 Ω 99 nV p-p

DC PERFORMANCE

Input Offset Voltage −500 −30 +500 μV

Input Offset Voltage Drift 0.2 μV/°C

Input Bias Current −17 −11 −4 μA

Input Bias Current Drift 3 nA/°C

Input Bias Offset Current −0.6 −0.02 +0.6 μA

Open-Loop Gain V

= 0.5 V to 4.5 V 97 110 dB

OUT

Rev. | Page 4 of 28

Data Sheet ADA4896-2/ADA4897-1/ADA4897-2

B

Parameter Test Conditions/Comments Min Typ Max Unit

INPUT CHARACTERISTICS

Input Resistance

Common-Mode 10 MΩ
Differential 10 kΩ

Input Capacitance

Common-Mode 3 pF
Differential 11 pF

Input Common-Mode Voltage Range 0.1 to 4.1 V

= 1 V to 4 V −91 −118 dB

Common-Mode Rejection Ratio

(CMRR)

OUTPUT CHARACTERISTICS

Output Overdrive Recovery Time VIN = 0 V to 5 V, G = +2 96 ns
Output Voltage Swing

Positive RL = 1 kΩ 4.85 4.98 V

R

Negative RL = 1 kΩ 0.15 0.014 V
R
Output Current SFDR = −45 dBc 70 mA
Short-Circuit Current Sinking/sourcing 125 mA
Capacitive Load Drive 30% overshoot, G = +2 39 pF

POWER SUPPLY

Operating Range 3 to 10 V
Quiescent Current per Amplifier 2.6 2.8 2.9 mA

Power Supply Rejection Ratio (PSRR)

Positive +VS = 4.5 V to 5.5 V, −VS = 0 V −96 −123 dB

Negative +VS = 5 V, −VS = −0.5 V to +0.5 V −96 −121 dB

DISABLE PIN ( / ) ADA4897-1 ADA4897-2

DISABLE Voltage

Disabled <+VS − 2 V

Input Current

Enabled

Disabled
Switching Speed

Enabled 0.25 μs

Disabled 12 μs

V

CM

= 100 Ω 4.8 4.88 V

L

= 100 Ω 0.2 0.08 V

L

DISABLE

= 0 V

0.05 0.18 mA

Enabled >+V

DISABLE
DISABLE

= +5 V
= 0 V

−1.2 μA

−20 μA

− 0.5 V

S

Rev. | Page 5 of 28

ADA4896-2/ADA4897-1/ADA4897-2 Data Sheet

B

+3 V SUPPLY

TA = 25°C, G = +1, RL = 1 kΩ to midsupply, unless otherwise noted.

Table 5.

Parameter Test Conditions/Comments Min Typ Max Unit

DYNAMIC PERFORMANCE

−3 dB Bandwidth G = +1, V
G = −1, V
G = +2, V

Bandwidth for 0.1 dB Flatness G = +2, V
Slew Rate G = +2, V
Settling Time to 0.1% G = +2, V
Settling Time to 0.01% G = +2, V

NOISE/HARMONIC PERFORMANCE

Harmonic Distortion (SFDR) fC = 100 kHz, V
f
f
f

= 1 MHz, V

C

= 2 MHz, V

C

= 5 MHz, V

C

Input Voltage Noise f = 10 Hz 2.3 nV/√Hz

f = 100 kHz 1 nV/√Hz

Input Current Noise f = 10 Hz 11 pA/√Hz

f = 100 kHz 2.8 pA/√Hz

0.1 Hz to 10 Hz Noise G = +101, RF = 1 kΩ, RG = 10 Ω 99 nV p-p

DC PERFORMANCE

Input Offset Voltage −500 −30 +500 μV

Input Offset Voltage Drift 0.2 μV/°C

Input Bias Current −17 −11 −4 μA

Input Bias Current Drift 3 nA/°C

Input Bias Offset Current −0.6 −0.02 +0.6 μA

Open-Loop Gain V

OUT

INPUT CHARACTERISTICS

Input Resistance

Common-Mode 10 MΩ
Differential 10 kΩ

Input Capacitance

Common-Mode 3 pF
Differential 11 pF

Input Common-Mode Voltage Range 0.1 to 2.1 V

= 1.1 V to 1.9 V −90 −124 dB

Common-Mode Rejection Ratio

V

CM

(CMRR)

OUTPUT CHARACTERISTICS

Output Overdrive Recovery Time VIN = 0 V to 3 V, G = +2 83 ns

Output Voltage Swing

Positive RL = 1 kΩ 2.85 2.97 V

R

= 100 Ω 2.8 2.92 V

L

Negative RL = 1 kΩ 0.15 0.01 V

R

= 100 Ω 0.2 0.05 V

L

Output Current SFDR = −45 dBc 60 mA

Short-Circuit Current Sinking/sourcing 120 mA

Capacitive Load Drive 30% overshoot, G = +2 39 pF
POWER SUPPLY

Operating Range 3 to 10 V

Quiescent Current per Amplifier 2.5 2.7 2.9 mA

DISABLE

= 0.02 V p-p 230 MHz

OUT

= 1 V p-p 45 MHz

OUT

= 0.02 V p-p 90 MHz

OUT

= 2 V p-p, RL = 100 Ω 7 MHz

OUT

= 1 V step 85 V/μs

OUT

= 2 V step 45 ns

OUT

= 2 V step 96 ns

OUT

= 2 V p-p, G = +2 −105 dBc

OUT

= 1 V p-p, G = −1 −84 dBc

OUT

= 1 V p-p, G = −1 −77 dBc

OUT

= 1 V p-p, G = −1 −60 dBc

OUT

= 0.5 V to 2.5 V 95 108 dB

= 0 V

0.035 0.15 mA

Rev. | Page 6 of 28

Data Sheet ADA4896-2/ADA4897-1/ADA4897-2

B

Parameter Test Conditions/Comments Min Typ Max Unit

Power Supply Rejection Ratio (PSRR)

Positive +VS = 2.7 V to 3.7 V, −VS = 0 V −96 −121 dB
Negative +VS = 3 V, −VS = −0.3 V to +0.7 V −96 −120 dB

DISABLE PIN ( / ) ADA4897-1 ADA4897-2

DISABLE Voltage

Disabled <−VS + 2 V

Input Current

Enabled
Disabled

Switching Speed

Enabled 0.25 μs
Disabled 12 μs

Enabled >+V

DISABLE
DISABLE

= +3 V
= 0 V

−1.2 μA

−15 μA

− 0.5 V

S

Rev. | Page 7 of 28

ADA4896-2/ADA4897-1/ADA4897-2 Data Sheet



A

ABSOLUTE MAXIMUM RATINGS

Table 6.

Parameter Rating

Supply Voltage 11 V
Power Dissipation See Figure 3
Common-Mode Input Voltage −VS − 0.7 V to +VS + 0.7 V
Differential Input Voltage

0.7 V

Storage Temperature Range −65°C to +125°C
Operating Temperature Range −40°C to +125°C
Lead Temperature (Soldering 10 sec) 300°C
Junction Temperature 150°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, θJA is
specified for a device soldered in a circuit board for surface­mount packages. Table 7 lists the θ

for the ADA4896-2/

JA

ADA4897-1/ADA4897-2.

Table 7. Thermal Resistance

Package Type θJA Unit

8-Lead Dual MSOP (ADA4896-2) 222 °C/W
8-Lead Dual LFCSP (ADA4896-2) 61 °C/W
8-Lead Single SOIC (ADA4897-1) 133 °C/W
6-Lead Single SOT-23 (ADA4897-1) 150 °C/W
10-Lead Dual MSOP (ADA4897-2) 210 °C/W

MAXIMUM POWER DISSIPATION

The maximum safe power dissipation for the ADA4896-2/

ADA4897-1/ADA4897-2 is limited by the associated rise in

junction temperature (T
which is the glass transition temperature, the properties of the
plastic change. Even temporarily exceeding this temperature
limit may change the stresses that the package exerts on the
die, permanently shifting the parametric performance of the

ADA4896-2/ADA4897-1/ADA4897-2. Exceeding a junction

temperature of 175C for an extended period of time can result
in changes in silicon devices, potentially causing degradation or
loss of functionality.

The power dissipated in the package (P
quiescent power dissipation and the power dissipated in the
die due to the ADA4896-2/ADA4897-1/ADA4897-2 drive at
the output.

) on the die. At approximately 150C,

J

) is the sum of the

D

The quiescent power dissipation is the voltage between the supply
pins (±V

RMS output voltages should be considered. If R

−V
I

OUT

case, when V

In single-supply operation with R
is V

Airflow increases heat dissipation, effectively reducing θ

) multiplied by the quiescent current (IS).

S

= Quiescent Power + (Total Drive Power − Load Power)

P

D



V



D

, as in single-supply operation, the total drive power is VS ×

S



IVP

SS



2





V

OUTS







R

L



2

V

OUT



R

L

is referenced to

L

. If the rms signal levels are indeterminate, consider the worst

= VS/4 for RL to midsupply.

OUT

2



V

4/



D

OUT

= VS/2.

IVP



SS

S

R

L

referenced to −VS, worst case

L

.

JA

Also, more metal directly in contact with the package leads
and exposed paddle from metal traces, through holes, ground,
and power planes reduces θ

.

JA

Figure 3 shows the maximum safe power dissipation in the
package vs. the ambient temperature on a JEDEC standard
4-layer board. θ

3.5

3.0

2.5

TION (W)

2.0

1.5

1.0

MAXIMUM POWER DISSIP

0.5

0

–45 –35 –25 –15 –5 5 15 25 35 45 55 65 75 85 95 105 115 125

Figure 3. Maximum Power Dissipation vs. Temperature for a 4-Layer Board

values are approximations.

JA

T

= 150°C

J

6-LEAD SOT-23

10-LEAD MSOP

8-LEAD MSOP

AMBIENT T E M P ERATURE ( ° C)

8-LEAD LF C S P

8-LEAD SOIC

09447-053

ESD CAUTION

Rev. B | Page 8 of 28

Data Sheet ADA4896-2/ADA4897-1/ADA4897-2

T

B

PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS

ADA4896-2

1OUT1

2–IN1

3+IN1

4–V

S

NOTES

1. THE EXPO SED PAD CAN BE
CONNECTED TO GND OR
POWER PLANES, OR IT CAN
BE LEFT FLOATING.

Figure 4. 8-Lead LFCSP Pin Configuration

Table 8. ADA4896-2 Pin Function Descriptions

Pin No. Mnemonic Description

1 OUT1 Output 1.
2 −IN1 Inverting Input 1.
3 +IN1
4 −V

Negative Supply.

S

5 +IN2
6 −IN2
7 OUT2
8 +V

Positive Supply.

S

EPAD

8+V

S

7OUT2

6–IN2

5+IN2

OUT1

09447-022

–IN1

+IN1

–V

1

2

3

4

S

ADA4896-2

TOP VIEW

(Not to Scale)

8

7

6

5

+V

S

OUT2

–IN2

+IN2

09447-002

Figure 5. 8-Lead MSOP Pin Configuration

Noninverting Input 1.

Noninverting Input 2.
Inverting Input 2.
Output 2.

Exposed Pad (LFCSP Only). The exposed pad can be connected to GND or power planes, or it can
be left floating.

NC

1

–IN

2

+IN

3

4

–V

S

ADA4897-1

NC = NO CONNEC T. DO NOT

CONNEC

8

7

6

5

TO THIS PIN.

DISABLE

+V

S

OUT

NC

09447-016

Figure 6. 8-Lead SOIC Pin Configuration

Table 9. ADA4897-1 Pin Function Descriptions

Pin No.

SOIC Mnemonic Description SOT-23

1, 5 N/A NC No Connect. Do not connect to these pins.
2 4 −IN Inverting Input.
3 3 +IN Noninverting Input.
4 2 −VS Negative Supply.
6 1 OUT Output.
7 6 +VS Positive Supply.
8 5

DISABLE

Disable.

OUT

–V

+IN

1

2

S

3

ADA4897-1

6

+V

5

DISABLE

–IN

4

S

09447-017

Figure 7. 6-Lead SOT-23 Pin Configuration

Rev. | Page 9 of 28