FUNCTIONAL BLOCK DIAGRAM
FEATURES
APPLICATIONS
Low noise preamplifier
Ultrasound amplifiers
PLL Loop filters
High performance ADC drivers
DAC buffers
GENERAL DESCRIPTION
The ADA4897-2 is a unity gain stable, low noise, rail-to-rail
output, high speed voltage feedback amplifier that has a
quiescent current of 3 mA. With the 1/f noise of 2.4 nV/√Hz at
10 Hz and a spurious-free dynamic range of −80 dBc at 2 MHz,
the ADA4897-2 is an ideal solution in a variety of applications,
including ultrasound, low noise preamplifiers, and drivers of
high performance ADCs. Analog Devices, Inc., proprietary next
generation SiGe bipolar process and innovative architecture
enables such a high performance amplifier.
TheADA4897-2 has 230 MHz bandwidth, 120 V/μs slew rate,
and settle to 0.1% in 45 ns. With a wide supply voltage range
(3 V to 10 V), the ADA4897-2/ADA4897-1 is an ideal
candidates for systems that require high dynamic range,
precision, and high speed.
Figure 1. 10-Lead ADA4897-2 MSOP
8
VS = ±5V
7
VOLTAGE NOISE (nV/√Hz)
Low wideband noise
1 nV/√Hz
2.8 pA/√Hz
Low 1/f noise
2.4 nV/√Hz @ 10 Hz
Low distortion: −115 dBc @ 100 kHz, VOUT = 2 V p-p
Low power: 3 mA/amp
Low input offset voltage: 0.5 mV maximum
High speed
230 MHz, −3 dB bandwidth (G = +1)
120 V/μs slew rate
45 ns settling time to 0.1%
Rail-to-rail output
Wide supply range: 3 V to 10 V
Output disable feature
6
5
4
3
2
1
0
1
10
100
1k
10k
100k
1M
FREQUENCY (Hz)
5M
09447-027
Preliminary Technical Data
1 nV/√Hz, Low Power,
Rail-to-Rail Output Amplifiers
ADA4897-2
Figure 2.Voltage Noise vs. Frequency
Table 1. Other Low Noise Amplifiers
Part Number
AD797
AD8021
AD8099
AD8045
ADA4899-1
ADA4896-2/
ADA4897-1/
ADA4898-1/
ADA4898-2
VN (nV/√Hz)
@ 1 kHz
0.9
5
7
6
1.4
1
VN (nV/√Hz)
@ 100 kHz
0.9
2.1
0.95
3
1
1
BW (MHz)
8
490
510
1000
600
230
Supply
Voltage (V)
10 to 30
5 to 24
5 to 12
3.3 to 12
5 to 12
3 to 10
0.9
0.9
65
10 to 32
Table 2. Complementary ADCs
Part Number
AD7944
AD7985
AD7986
Bits
14
16
18
Speed (MSPS)
2.5
2.5
2
Power (mW)
15.5
15.5
15
The ADA4897-2 is available in an 10-lead MSOP package and
operates over the extended industrial temperature range of
−40°C to +125°C.
Rev. PrA
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
©2011 Analog Devices, Inc. All rights reserved.
ADA4897-2
Preliminary Technical Data
TABLE OF CONTENTS
Features .............................................................................................. 1 ±5 V Supply ....................................................................................3 Applications ....................................................................................... 1 +5 V Supply ....................................................................................5 General Description ......................................................................... 1 +3 V Supply ....................................................................................7 Functional Block Diagram .............................................................. 1 Outline Dimensions ..........................................................................9 Revision History ............................................................................... 2 Ordering Guide .............................................................................9 Specifications..................................................................................... 3 Rev. PrA | Page 2 of 10
Preliminary Technical Data
ADA4897-2
SPECIFICATIONS
±5 V SUPPLY
TA = 25°C, G = +1, RL = 1 kΩ to ground, unless otherwise noted.
Table 3.
Parameter
DYNAMIC PERFORMANCE
–3 dB Bandwidth
Bandwidth for 0.1 dB Flatness
Slew Rate
Settling Time to 0.1%
Settling Time to 0.01%
NOISE/HARMONIC PERFORMANCE
Harmonic Distortion (dBc) SFDR
Input Voltage Noise
Input Current Noise
0.1 Hz to 10 Hz Noise
DC PERFORMANCE
Input Offset Voltage
Input Offset Voltage Drift
Input Bias Current
Input Bias Current Drift
Input Bias Offset Current
Open-Loop Gain
INPUT CHARACTERISTICS
Input Resistance
Input Capacitance
Input Common-Mode Voltage Range
Common-Mode Rejection
OUTPUT CHARACTERISTICS
Output Overdrive Recovery Time
+Output Voltage Swing
−Output Voltage Swing
+Output Voltage Swing
−Output Voltage Swing
Output Current
Short-Circuit Current
Capacitive Load Drive
POWER SUPPLY
Operating Range
Quiescent Current per Amplifier
Positive Power Supply Rejection
Negative Power Supply Rejection
Conditions
Min
Typ
Max
Unit
G = +1, VOUT = 0.02 V p-p
G = +1, VOUT = 2 V p-p
G = +2, VOUT = 0.02 V p-p
G = +2, VOUT = 2 V p-p, RL = 100 Ω
G = +2, VOUT = 6 V step
G = +2, VOUT = 2 V step
G = +2, VOUT = 2 V step
230
30
90
7
120
45
90
MHz
MHz
MHz
MHz
V/μs
ns
ns
fC= 100 kHz, VOUT = 2 V p-p
fC= 1 MHz, VOUT = 2 V p-p
fC = 2 MHz, VOUT = 2 V p-p
fC = 5 MHz, VOUT = 2 V p-p
f = 10 Hz
f = 100 kHz
f = 10 Hz
f = 100 kHz
G = +101, RF = 1 kΩ, RG = 10 Ω
−115
−93
−80
−61
2.4
1
31
2.8
99
dBc
dBc
dBc
dBc
nV/√Hz
nV/√Hz
pA/√Hz
pA/√Hz
nV p-p
−500
−0.6
100
−28
0.2
−11
3
−0.02
110
−92
10M/10k
3/11
−4.9 to +4.1
−120
Ω
pF
V
dB
81
4.96
−4.97
4.73
−4.84
80
135
39
ns
V
V
V
V
mA
mA
pF
3 to 10
3.0
0.25
−125
−121
V
mA
mA
dB
dB
−17
VOUT = −4 V to +4 V
Common mode/differential
Common mode/differential
VCM = −2 V to +2 V
VIN = ±5 V, G = +2
RL = 1 kΩ
RL = 1 kΩ
RL = 100 Ω
RL = 100 Ω
45 dBc SFDR
Sinking/sourcing
30% overshoot, G = +2
4.85
−4.85
4.5
−4.5
2.8
DISABLE = −5 V
+VS = 4 V to 6 V, −VS = −5 V
+VS = 5 V, −VS = −4 V to −6 V
Rev. PrA | Page 3 of 10
−96
−96
+500
−4
+0.6
3.2
μV
μV/°C
μA
nA/°C
μA
dB
ADA4897-2
Parameter
DISABLE PIN
DISABLE Voltage
Input Current
Enabled
Disabled
Switching Speed
Enabled
Disabled
Preliminary Technical Data
Conditions
Min
Typ
Max
Unit
Enabled
Disabled
>+VS − 0.5
<+VS – 2
V
V
DISABLE = +5 V
DISABLE = −5 V
−2.5
−80
μA
μA
0.25
12
μs
μs
Rev. PrA | Page 4 of 10
Preliminary Technical Data
ADA4897-2
+5 V SUPPLY
TA = 25°C, G = +1, RL = 1 kΩ to midsupply, unless otherwise noted.
Table 4.
Parameter
DYNAMIC PERFORMANCE
−3 dB Bandwidth
Bandwidth for 0.1 dB Flatness
Slew Rate
Settling Time to 0.1%
Settling Time to 0.01%
NOISE/Harmonic PERFORMANCE
Harmonic Distortion (dBc) SFDR
Input Voltage Noise
Input Current Noise
0.1 Hz to 10 Hz Noise
DC PERFORMANCE
Input Offset Voltage
Input Offset Voltage Drift
Input Bias Current
Input Bias Current Drift
Input Bias Offset Current
Open-Loop Gain
INPUT CHARACTERISTICS
Input Resistance
Input Capacitance
Input Common-Mode Voltage Range
Common-Mode Rejection
OUTPUT CHARACTERISTICS
Overdrive Recovery Time
+Output Voltage Swing
−Output Voltage Swing
+Output Voltage Swing
−Output Voltage Swing
Output Current
Short-Circuit Current
Capacitive Load Drive
POWER SUPPLY
Operating Range
Quiescent Current per Amplifier
Positive Power Supply Rejection
Negative Power Supply Rejection
Conditions
Min
Typ
Max
Unit
G = +1, VOUT = 0.02 V p-p
G = +1, VOUT = 2 V p-p
G = +2, VOUT = 0.02 V p-p
G = +2, VOUT = 2 V p-p, RL = 100 Ω
G = +2, VOUT = 3 V step
G = +2, VOUT = 2 V step
G = +2, VOUT = 2 V step
230
30
90
7
100
45
95
MHz
MHz
MHz
MHz
V/μs
ns
ns
fC = 100 kHz, VOUT = 2 V p-p
fC = 1 MHz, VOUT = 2 V p-p
fC = 2 MHz, VOUT = 2 V p-p
fC = 5 MHz, VOUT = 2 V p-p
f = 10 Hz
f = 100 kHz
f = 10 Hz
f = 100 kHz
G = +101, RF = 1 kΩ, RG = 10 Ω
−115
−93
−80
−61
2.4
1
31
2.8
99
dBc
dBc
dBc
dBc
nV/√Hz
nV/√Hz
pA/√Hz
pA/√Hz
nV p-p
−500
−0.6
97
−30
0.2
−11
3
−0.02
110
−91
10M/10k
3/11
0.1 to 4.1
−118
Ω
pF
V
dB
96
4.98
0.014
4.88
0.08
70
125
39
ns
V
V
V
−17
VOUT = 0.5 V to 4.5 V
Common mode/differential
Common mode/differential
VCM = +1 V to +4 V
VIN = 0 V to 5 V, G = +2
RL = 1 kΩ
RL = 1 kΩ
RL = 100 Ω
RL = 100 Ω
45 dBc SFDR
Sinking/sourcing
30% overshoot, G = +2
4.85
0.15
4.8
0.2
2.6
DISABLE = 0 V
+VS = 4.5 V to 5.5 V, −VS = 0 V
+VS = 5 V, −VS = −0.5 V to +0.5 V
Rev. PrA | Page 5 of 10
−96
−96
3 to 10
2.8
0.18
−123
−121
+500
−4
+0.6
μV
μV/°C
μA
nA/°C
μA
dB
mA
mA
pF
2.9
V
mA
dB
dB
ADA4897-2
Parameter
DISABLE PIN
DISABLE Voltage
Input Current
Enabled
Disabled
Switching Speed
Enabled
Disabled
Preliminary Technical Data
Conditions
Min
Typ
Max
Unit
Enabled
Disabled
>+VS − 0.5
<+VS − 2
V
V
DISABLE = +5 V
DISABLE = 0 V
−2.5
−50
μA
μA
0.25
12
μs
μs
Rev. PrA | Page 6 of 10
Preliminary Technical Data
ADA4897-2
+3 V SUPPLY
TA = 25°C, G = +1, RL = 1 kΩ to midsupply, unless otherwise noted.
Table 5.
Parameter
DYNAMIC PERFORMANCE
−3 dB Bandwidth
Bandwidth for 0.1 dB Flatness
Slew Rate
Settling Time to 0.1%
Settling Time to 0.01%
NOISE/Harmonic PERFORMANCE
Harmonic Distortion (dBc) SFDR
Input Voltage Noise
Input Current Noise
0.1 Hz to 10 Hz Noise
DC PERFORMANCE
Input Offset Voltage
Input Offset Voltage Drift
Input Bias Current
Input Bias Current Drift
Input Bias Offset Current
Open-Loop Gain
INPUT CHARACTERISTICS
Input Resistance
Input Capacitance
Input Common-Mode Voltage Range
Common-Mode Rejection
OUTPUT CHARACTERISTICS
Overdrive Recovery Time
+Output Voltage Swing
−Output Voltage Swing
+Output Voltage Swing
−Output Voltage Swing
Output Current
Short-Circuit Current
Capacitive Load Drive
POWER SUPPLY
Operating Range
Quiescent Current per Amplifier
Positive Power Supply Rejection
Negative Power Supply Rejection
Conditions
Min
Typ
Max
Unit
G = +1, VOUT = 0.02 V p-p
G = −1, VOUT = 1 V p-p
G = +2, VOUT = 0.02 V p-p
G = +2, VOUT = 2 V p-p, RL = 100 Ω
G = +2, VOUT = 1 V step
G = +2, VOUT = 2 V step
G = +2, VOUT = 2 V step
230
45
90
7
85
45
96
MHz
MHz
MHz
MHz
V/μs
ns
ns
fC = 100 kHz, VOUT = 2 V p-p, G = +2
fC = 1 MHz, VOUT = 1 V p-p, G = −1
fC = 2 MHz, VOUT = 1 V p-p, G = −1
fC = 5 MHz, VOUT = 1 V p-p, G = −1
f = 10 Hz
f = 100 kHz
f = 10 Hz
f = 100 kHz
G = +101, RF = 1 kΩ, RG = 10 Ω
−105
−84
−77
−60
2.3
1
31
2.8
99
dBc
dBc
dBc
dBc
nV/√Hz
nV/√Hz
pA/√Hz
pA/√Hz
nV p-p
−500
−0.6
95
−30
0.2
−11
3
−0.02
108
−90
10M/10k
3/11
0.1 to 2.1
−124
Ω
pF
V
dB
83
2.97
0.01
2.92
0.05
60
120
39
ns
V
V
V
V
mA
mA
pF
−17
VOUT= 0.5 V to 2.5 V
Common mode/differential
Common mode/differential
VCM = +1.1 V to +1.9 V
VIN = 0 V to +3 V, G = +2
RL = 1 kΩ
RL = 1 kΩ
RL = 100 Ω
RL = 100 Ω
45 dBc SFDR
Sinking/sourcing
30% overshoot, G = +2
2.85
0.15
2.8
0.2
2.5
DISABLE = 0 V
+VS = 2.7 V to 3.7 V, −VS = 0 V
+VS = 3 V, −VS = −0.3 V to 0.7 V
Rev. PrA | Page 7 of 10
−96
−96
3 to 10
2.7
0.15
−121
−120
+500
−4
+0.6
2.9
uV
μV/°C
μA
nA/°C
μA
dB
V
mA
dB
dB
ADA4897-2
Parameter
DISABLE PIN
DISABLE Voltage
Input Current
Enabled
Disabled
Switching Speed
Enabled
Disabled
Preliminary Technical Data
Conditions
Min
Typ
Max
Unit
Enabled
Disabled
>+VS −0.5
<−VS + 2
V
V
DISABLE = +3 V
DISABLE = 0 V
−2.5
−40
μA
μA
0.25
12
μs
μs
Rev. PrA | Page 8 of 10
Preliminary Technical Data
ADA4897-2
OUTLINE DIMENSIONS
3.00 BSC
6
10
4.90 BSC
3.00 BSC
1
5
PIN 1
0.50 BSC
0.95
0.85
0.75
1.10 MAX
0.15
0.00
0.27
0.17
SEATING
PLANE
0.23
0.08
8°
0°
0.80
0.60
0.40
COPLANARITY
0.10
COMPLIANT TO JEDEC STANDARDS MO-187-BA
Figure 3. 10-Lead Mini Small Outline Package [MSOP]
(RM-10)
Dimensions shown in millimeters
ORDERING GUIDE
Model1
ADA4897-2ARMZ
ADA4897-2ARMZ-R7
ADA4897-2ARMZ-RL
1
Temperature Range
−40°C to +125°C
−40°C to +125°C
−40°C to +125°C
Package Description
10-Lead MSOP
10-Lead MSOP
10-Lead MSOP
Z = RoHS Compliant Part.
Rev. PrA | Page 9 of 10
Package Option
RM-10
RM-10
RM-10
Ordering Quantity
1
1,000
3,000
Branding
ADA4897-2
Preliminary Technical Data
NOTES
©2011 Analog Devices, Inc. All rights reserved. Trademarks and
registered trademarks are the property of their respective owners.
PR09447-0-9/11(PrA)
Rev. PrA | Page 10 of 10