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ADA4897-2
Service Manual
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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
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: 781.329.4700 www.analog.com Fax: 781.461.3113 ©2012 Analog Devices, Inc. All rights reserved.
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 175C 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
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