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PDF ADA4841-1 Data sheet ( Hoja de datos )
| Número de pieza | ADA4841-1 | |
| Descripción | (ADA4841-1/-2) Rail-to-Rail Output Amplifier | |
| Fabricantes | Analog Devices | |
| Logotipo |  |
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Low Power, Low Noise and Distortion,
Rail-to-Rail Output Amplifier
ADA4841-1/ADA4841-2
FEATURES
Low power: 1.1 mA/amp
Low wideband noise
2.1 nV/√Hz
1.4 pA/√Hz
Low 1/f noise
7 nV/√Hz @ 10 Hz
13 pA/√Hz @ 10 Hz
Low distortion: −105 dBc @ 100 kHz, VO = 2 V p-p
High speed
80 MHz, −3 dB bandwidth (G = +1)
12 V/μs slew rate
175 ns settling time to 0.1%
Low offset voltage: 0.3 mV maximum
Rail-to-rail output
Power down
Wide supply range: 2.7 V to 12 V
APPLICATIONS
Low power, low noise signal processing
Battery-powered instrumentation
16-bit PulSAR® ADC drivers
GENERAL DESCRIPTION
The ADA4841-1/ADA4841-2 are unity gain stable, low
noise and distortion, rail-to-rail output amplifiers that have a
quiescent current of 1.5 mA maximum. Despite their low power
consumption, these amplifiers offer low wideband voltage noise
performance of 2.1 nV/√Hz and 1.4 pA/√Hz current noise,
along with excellent spurious-free dynamic range (SFDR) of
−105 dBc at 100 kHz. To maintain a low noise environment at
lower frequencies, the amplifiers have low 1/f noise of 7 nV/√Hz
and 13 pA/√Hz at 10 Hz.
The ADA4841-1/ADA4841-2 output can swing to less than
50 mV of either rail. The input common-mode voltage range
extends down to the negative supply. The ADA4841-1/
ADA4841-2 can drive up to 10 pF of capacitive load with
minimal peaking.
The ADA4841-1/ADA4841-2 provide the performance required
to efficiently support emerging 16-bit to 18-bit ADCs and are
ideal for portable instrumentation, high channel count, industrial
measurement, and medical applications. The ADA4841-1/
ADA4841-2 are ideally suited to drive the AD7685/AD7686,
16-bit PulSAR ADCs.
Rev. C
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.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
CONNECTION DIAGRAMS
ADA4841-1
NC
TOP VIEW
1 (Not to Scale)
8
POWER DOWN
–IN 2
7 +VS
+IN 3
6 VOUT
–VS 4
5 NC
Figure 1. 8-Lead SOIC (R)
ADA4841-2
OUT1 1
–IN1 2
+IN1 3
–VS 4
8 +VS
7 OUT2
6 –IN2
5 +IN2
TOP VIEW
(Not to Scale)
Figure 2. 8-Lead MSOP (RM-8) and 8-Lead SOIC_N (R)
ADA4841-1
VOUT 1
6 +VS
–VS 2
5 POWER DOWN
+IN 3
4 –IN
Figure 3. 6-Lead SOT-23 (RJ)
The ADA4841-1/ADA4841-2 packages feature Pb-free lead
finish. The amplifiers are rated to work over the industrial
temperature range (−40°C to +125°C).
–30
VS = ±5V
–40 G = +1
–50
–60
–70
2V p-p THIRD
–80
–90
–100
2V p-p SECOND
–110
–120
0.01
0.1
FREQUENCY (MHz)
Figure 4. Harmonic Distortion
1
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
©2006 Analog Devices, Inc. All rights reserved.
1 page  
ADA4841-1/ADA4841-2
TA = 25°C, VS = 3 V, RL = 1 kΩ, Gain =+1, VCM = 1.5 V, unless otherwise noted.
Table 3.
Parameter
DYNAMIC PERFORMANCE
−3 dB Bandwidth
Slew Rate
Settling Time to 0.1%
Settling Time to 0.01%
NOISE/HARMONIC PERFORMANCE
Harmonic Distortion HD2/HD3
Input Voltage Noise
Input Current Noise
DC PERFORMANCE
Input Offset Voltage
Input Offset Voltage Drift
Input Bias Current
Input Offset Current
Open-Loop Gain
INPUT CHARACTERISTICS
Input Resistance, Common Mode
Input Resistance, Differential Mode
Input Capacitance, Common Mode
Input Capacitance, Differential Mode
Input Common-Mode Voltage Range
Common-Mode Rejection Ratio (CMRR)
MATCHING CHARACTERISTICS (ADA4841-2)
Input Offset Voltage
Input Bias Current
POWER DOWN PIN (ADA4841-1)
Conditions
VO = 0.02 V p-p
G = +1, VO = 2 V step, RL = 1 kΩ
G = +1, VO = 1 V step
G = +1, VO = 1 V step
fC = 100 kHz, VO = 1 V p-p
fC = 1 MHz, VO = 1 V p-p
f = 100 kHz
f = 100 kHz
VO = 0.5 V to 2.5 V
VCM = Δ 0.4 V
POWER DOWN Voltage
Enabled
POWER DOWN Voltage
Power down
Input Current
Enable
POWER DOWN = 3 V
Power Down
POWER DOWN = 0 V
Switching Speed
Enable
Power Down
OUTPUT CHARACTERISTICS
Output Voltage Swing
Output Current Limit
Capacitive Load Drive
POWER SUPPLY
Operating Range
Quiescent Current/Amplifier
G > +1
Sourcing, VIN = +VS, RL = 50 Ω to VCM
Sinking, VIN = −VS, RL = 50 Ω to VCM
30% overshoot
POWER DOWN = 3 V
POWER DOWN = 0 V
Positive Power Supply Rejection Ratio
Negative Power Supply Rejection Ratio
+VS = +3 V to +4 V, −VS = 0 V
+VS = +3 V, −VS = 0 V to −1 V
Min Typ Max Unit
52 80
10 12
120
250
MHz
V/μs
ns
ns
−97/−100
−79/−80
2.1
1.4
dBc
dBc
nV/√Hz
pA/√Hz
40 300 μV
1 μV/°C
3 5.3 μA
0.1 0.5 μA
101 123
dB
90
25
1
3
−0.1
86 115
MΩ
kΩ
pF
pF
+2 V
dB
70 μV
60 nA
>1.6
<1.2 V
1 2 μA
−10 −30 μA
1 μs
40 μs
0.045 to 2.955
0.023 to 2.988
30
60
30
V
mA
mA
pF
2.7 12 V
1.1 1.3 mA
25 60 μA
95 110
dB
96 120
dB
Rev. C | Page 5 of 20
5 Page 
6
POWER DOWN PIN
5
4
3
+125°C
2 +25°C
1 –40°C
0
POWER DOWN PIN
–1
VS = 5V
G = +1
VIN = 1VDC
TIME = 10μs/DIV
1.2
1.0
0.8
0.6
0.4
0.2
0
–0.2
Figure 30. POWER DOWN Time vs. Temperature
1.6
VS = 5V
1.4
+125°C
1.2
1.0 +25°C
0.8 –40°C
0.6
0.4
0.2
0
–0.2
0
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
POWER DOWN PIN (V)
Figure 31. Supply Current per Amplifier vs. POWER DOWN Pin Voltage
0 VS = ±5V
G = +1
–20
–40
–60
–80
–100
–120
100
1k 10k 100k 1M 10M 100M
FREQUENCY (Hz)
Figure 32. CMR vs. Frequency
ADA4841-1/ADA4841-2
0
VS = 5V
–20
–40 +PSR
–60
–80
–100
–PSR
–120
100
1k 10k 100k 1M 10M 100M
FREQUENCY (Hz)
Figure 33. PSR vs. Frequency
100
VS = 5V
10
1
0.1
0.01
0.001
100 1k 10k 100k 1M 10M
FREQUENCY (Hz)
Figure 34. Output Impedance vs. Frequency
100M
40
30
20 VS = +5V
10
0
VS = ±5V
–10
–20
VS = +3V
–30
–40
–50
–40 –25 –10 5 20 35 50 65 80 95 110 125
TEMPERATURE (°C)
Figure 35. Input Offset Voltage vs. Temperature for Various Supplies
Rev. C | Page 11 of 20
11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet ADA4841-1.PDF ] | |
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