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ADA4841-2 Schematic ( PDF Datasheet ) - Analog Devices

Teilenummer ADA4841-2
Beschreibung (ADA4841-1/-2) Rail-to-Rail Output Amplifier
Hersteller Analog Devices
Logo Analog Devices Logo 




Gesamt 20 Seiten
ADA4841-2 Datasheet, Funktion
www.DataSheet4U.com
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.






ADA4841-2 Datasheet, Funktion
ADA4841-1/ADA4841-2
ABSOLUTE MAXIMUM RATINGS
Table 4.
Parameter
Supply Voltage
Power Dissipation
Common-Mode Input Voltage
Differential Input Voltage
Storage Temperature Range
Operating Temperature Range
Lead Temperature
Junction Temperature
Rating
12.6 V
See Figure 5
−VS − 0.5 V to +VS + 0.5 V
±1.8 V
−65°C to +125°C
−40°C to +85°C
JEDEC J-STD-20
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 device soldered in circuit board for surface-mount
packages.
Table 5. Thermal Resistance
Package Type
8-lead SOIC_N
8-lead MSOP
6-Lead SOT-23
θJA
125
130
170
Unit
°C/W
°C/W
°C/W
Maximum Power Dissipation
The maximum safe power dissipation for the ADA4841-1/
ADA4841-2 is limited by the associated rise in junction
temperature (TJ) on the die. At approximately 150°C, which is
the glass transition temperature, the plastic changes its
properties. Even temporarily exceeding this temperature limit
may change the stresses that the package exerts on the die,
permanently shifting the parametric performance of the
amplifiers. Exceeding a junction temperature of 150°C for an
extended period can result in changes in silicon devices,
potentially causing degradation or loss of functionality.
The power dissipated in the package (PD) is the sum of the
quiescent power dissipation and the power dissipated in the die
due to the amplifier’s drive at the output. The quiescent power is
the voltage between the supply pins (VS) times the quiescent
current (IS).
PD = Quiescent Power + (Total Drive Power Load Power)
( )PD =
VS × IS
+
⎜⎜⎝⎛
VS
2
× VOUT
RL
⎟⎟⎠⎞ −
VOUT 2
RL
RMS output voltages should be considered. If RL is referenced
to −VS, as in single-supply operation, the total drive power is
VS × IOUT. If the rms signal levels are indeterminate, consider the
worst case, when VOUT = VS/4 for RL to midsupply.
PD
=
(VS
× IS
)+
(VS/4)2
RL
In single-supply operation with RL referenced to −VS, worst case
is VOUT = VS/2.
Airflow increases heat dissipation, effectively reducing θJA.
In addition, more metal directly in contact with the package
leads and through holes under the device reduces θJA.
Figure 5 shows the maximum safe power dissipation in the
package vs. the ambient temperature for the 8-lead MSOP
(145°C/W), 8-lead SOIC_N (125°C/W) and the 6-lead SOT-23
(170°C/W) on a JEDEC standard 4-layer board. θJA values are
approximations.
2.0
1.5
SOIC
MSOP
1.0
SOT-23
0.5
0
–55 –45 –35 –25 –15 –5 5 15 25 35 45 55 65 75 85 95 105 115 125
AMBIENT TEMPERATURE (°C)
Figure 5. Maximum Power Dissipation vs. Temperature for a 4-Layer Board
ESD CAUTION
ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on
the human body and test equipment and can discharge without detection. Although this product features
proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy
electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance
degradation or loss of functionality.
Rev. C | Page 6 of 20

6 Page









ADA4841-2 pdf, datenblatt
ADA4841-1/ADA4841-2
3.6
3.5
VS = +5V
3.4
3.3 VS = +3V
VS = ±5V
3.2
3.1
–40 –25 –10 5 20 35 50 65 80 95 110 125
TEMPERATURE (°C)
Figure 36. Input Bias Current vs. Temperature for Various Supplies
1.6
1.5
1.4
1.3
1.2
1.1 VS = ±5V
1.0
VS = +5V
0.9
0.8
–40
VS = +3V
–25 –10 5
20 35 50 65 80 95 110 125
TEMPERATURE (°C)
Figure 37. Supply Current vs. Temperature for Various Supplies
–40
G = +1
–50 VS = 5V
–60 RL = 1k
–70
–80
–90
–100
A TO B
–110
–120
B TO A
–130
–140
10k
100k
1M 10M
FREQUENCY (Hz)
100M
Figure 38. Crosstalk Output to Output
1G
Rev. C | Page 12 of 20

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