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PDF ADA4895-1 Data sheet ( Hoja de datos )
| Número de pieza | ADA4895-1 | |
| Descripción | Railto-Rail Output Amplifier | |
| Fabricantes | Analog Devices | |
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Data Sheet
Low Power, 1 nV/√Hz, G ≥ 10 Stable, Rail-
to-Rail Output Amplifier
ADA4895-1/ADA4895-2
FEATURES
Low wideband noise
1 nV/√Hz
1.6 pA/√Hz
Low 1/f noise: 2 nV/√Hz at 10 Hz
Low distortion (SFDR): −96 dBc at 100 kHz, VOUT = 2 V p-p
Low power: 3 mA per amplifier
Low input offset voltage: 350 µV maximum
High speed
236 MHz, −3 dB bandwidth (G = +10)
943 V/µs slew rate
22 ns settling time to 0.1%
Rail-to-rail output
Wide supply range: 3 V to 10 V
Disable feature
APPLICATIONS
Low noise preamplifier
Ultrasound amplifiers
PLL loop filters
High performance analog-to-digital converter (ADC) drivers
Digital-to-analog converter (DAC) buffers
GENERAL DESCRIPTION
The ADA4895-1 (single) and ADA4895-2 (dual) are high speed
voltage feedback amplifiers that are gain ≥ 10 stable with low
input noise, rail-to-rail output, and a quiescent current of 3 mA per
amplifier. With a 1/f noise of 2 nV/√Hz at 10 Hz and a spurious-
free dynamic range (SFDR) of −72 dBc at 2 MHz, the ADA4895-1/
ADA4895-2 are an ideal solution 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
enables the high performance of these amplifiers.
The ADA4895-1/ADA4895-2 have a small signal bandwidth of
236 MHz at a gain of +10 with a slew rate of 943 V/µs, and settle
to 0.1% in 22 ns. The wide supply voltage range (3 V to 10 V)
of the ADA4895-1/ADA4895-2 make these amplifiers ideal
candidates for systems that require large dynamic range, high
gain, precision, and high speed.
The ADA4895-1 is available in 8-lead SOIC and 6-lead SOT-23
packages, and the ADA4895-2 is available in a 10-lead MSOP
package. All packages operate over the extended industrial
temperature range of −40°C to +125°C.
Rev. B
Document Feedback
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibilityisassumedbyAnalogDevices for itsuse,nor foranyinfringementsofpatentsor 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.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
FUNCTIONAL BLOCK DIAGRAMS
NC 1
8 DISABLE
–IN 2
+IN 3
7 +VS
6 OUT
–VS 4 ADA4895-1 5 NC
NC = NO CONNECT. DO NOT
CONNECT TO THIS PIN.
Figure 1. ADA4895-1 Single Amplifier (8-Lead SOIC)
OUT1 1
–IN1 2
+IN1 3
–VS 4
DISABLE1 5
10 +VS
9 OUT2
8 –IN2
7 +IN2
ADA4895-2 6 DISABLE2
Figure 2. ADA4895-2 Dual Amplifier (10-Lead MSOP)
5 30
4 24
3 18
2 12
VOLTAGE
16
CURRENT
00
1 10 100 1k 10k 100k 1M
FREQUENCY (Hz)
Figure 3. Input Voltage and Current Noise vs. Frequency
Table 1. Other Low Noise Amplifiers1
Part Number(s)
ven at 100 kHz Bandwidth
(nV/√Hz)
(MHz)
AD8021
2.1 490
AD8045
3 1000
AD8099
0.95 510
ADA4841-1/ADA4841-2 2.1
80
ADA4896-2
1
230
ADA4897-1/ADA4897-2 1
230
ADA4898-1/ADA4898-2 0.9
65
ADA4899-1
1
600
Supply
Voltage (V)
5 to 24
3.3 to 12
5 to 12
2.7 to 12
3 to 10
3 to 10
10 to 32
5 to 12
1 See www.analog.com for the latest selection of low noise amplifiers.
COMPANION PRODUCTS
ADCs: AD7944 (14-bit), AD7985 (16-bit), AD7986 (18-bit)
Additional companion products on the ADA4895-1/ADA4895-2
product page
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700 ©2012–2015 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com
1 page  
Data Sheet
Parameter
POWER SUPPLY
Operating Range
Quiescent Current per Amplifier
Positive Power Supply Rejection
Negative Power Supply Rejection
DISABLEx PIN
DISABLEx Voltage
Input Current per Amplifier
Device Enabled
Device Disabled
Switching Speed
Device Enabled
Device Disabled
Test Conditions/Comments
DISABLEx = −2.5 V
+VS = 2 V to 3 V, −VS = −2.5 V
+VS = 2.5 V, −VS = −3 V to −2 V
Device enabled
Device disabled
DISABLEx = +2.5 V
DISABLEx = −2.5 V
±1.5 V (OR +3 V) SUPPLY
TA = 25°C, G = +10, RF = 249 Ω, 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%
NOISE/HARMONIC PERFORMANCE
Harmonic Distortion (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
Test Conditions/Comments
VOUT = 0.2 V p-p
VOUT = 1 V p-p
VOUT = 0.2 V p-p, G = +20, RF = 1 kΩ
VOUT = 2 V p-p, RL = 100 Ω
VOUT = 1 V step
VOUT = 2 V step
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, G = +25.9
f = 100 kHz, G = +25.9
f = 10 Hz, RF = 10 kΩ, RG = 1.1 kΩ, RS = 1 kΩ
f = 100 kHz, RF = 10 kΩ, RG = 1.1 kΩ, RS = 1 kΩ
G = +101, RF = 1 kΩ, RG = 10 Ω
VOUT = −1 V to +1 V
Common mode/differential mode
Common mode/differential mode
VCM = −0.4 V to +0.4 V
ADA4895-1/ADA4895-2
Min Typ
3 to 10
2.6 2.8
0.05
−98 −137
−98 −141
>+VS − 0.5
<+VS − 2
−1.1
−20
0.25
6
Max Unit
V
3 mA
mA
dB
dB
V
V
µA
µA
µs
µs
Min Typ
Max Unit
205 MHz
131 MHz
111 MHz
7.5 MHz
384 V/µs
20 ns
−92 dBc
−73 dBc
−67 dBc
−59 dBc
1.9 nV/√Hz
1 nV/√Hz
14 pA/√Hz
1.7 pA/√Hz
99 nV p-p
−350
−16
−0.6
95
+55
0.15
−11
1.2
−0.02
106
+350
−6
+0.6
µV
µV/°C
µA
nA/°C
µA
dB
10 M/10 k
3/11
−1.4 to +0.6
−93 −110
Ω
pF
V
dB
Rev. B | Page 5 of 24
5 Page 
Data Sheet
4
ADA4895-2, MSOP
ADA4895-1, SOT-23
2
0
ADA4895-1, SOIC
–2
–4
–6
–8
VOUT = 200mV p-p
–10
0.1 1
10
100 1000
FREQUENCY (MHz)
Figure 14. Small Signal Frequency Response vs. Package
6
CL = 6pF
4
CL = 3pF
2
0 CL = 0pF
–2
–4
–6
–8
VOUT = 200mV p-p
–10
0.1 1
10
100 1000
FREQUENCY (MHz)
Figure 15. Small Signal Frequency Response vs. Capacitive Load
–40
VOUT = 2V p-p
–50
HD2, RL = 100Ω
–60
HD2, RL = 1kΩ
–70
–80
–90
–100
HD3, RL = 1kΩ
HD3, RL = 100Ω
–110
–120
0.1 1 10
FREQUENCY (MHz)
Figure 16. Harmonic Distortion vs. Frequency for Various Loads
ADA4895-1/ADA4895-2
4
2
ADA4895-1, SOT-23
0
–2
ADA4895-2, MSOP
ADA4895-1, SOIC
–4
–6
–8
VOUT = 2V p-p
–10
0.1 1
10 100 1000
FREQUENCY (MHz)
Figure 17. Large Signal Frequency Response vs. Package
120 0
110 –20
100
GAIN
90
–40
–60
80
70 PHASE
–80
–100
60 –120
50 –140
40 –160
30 –180
20 –200
10 –220
0 –240
1k
10k 100k
1M
10M 100M
1G
FREQUENCY (Hz)
Figure 18. Open-Loop Gain and Phase vs. Frequency
–40
VOUT = 2V p-p
–50
–60
–70 VS = ±5V
VS = ±2.5V
–80 VS = ±1.5V
HD2
–90
–100
HD3
–110
–120
VS = ±5V
VS = ±2.5V
VS = ±1.5V
–130
0.1 1 10
FREQUENCY (MHz)
Figure 19. Harmonic Distortion vs. Frequency for Various Supplies
Rev. B | Page 11 of 24
11 Page | ||
| Páginas | Total 24 Páginas | |
| PDF Descargar | [ Datasheet ADA4895-1.PDF ] | |
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