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AD8615 Schematic ( PDF Datasheet ) - Analog Devices

Teilenummer AD8615
Beschreibung Rail-to-Rail Input/Output Operational Amplifiers
Hersteller Analog Devices
Logo Analog Devices Logo 




Gesamt 20 Seiten
AD8615 Datasheet, Funktion
Data Sheet
Precision, 20 MHz, CMOS, Rail-to-Rail
Input/Output Operational Amplifiers
AD8615/AD8616/AD8618
FEATURES
Low offset voltage: 65 μV maximum
Single-supply operation: 2.7 V to 5.0 V
Low noise: 8 nV/√Hz
Wide bandwidth: >20 MHz
Slew rate: 12 V/μs
High output current: 150 mA
No phase reversal
Low input bias current: 1 pA
Low supply current: 2 mA
Unity-gain stable
APPLICATIONS
Barcode scanners
Battery-powered instrumentation
Multipole filters
Sensors
ASIC input or output amplifiers
Audio
Photodiode amplification
GENERAL DESCRIPTION
The AD8615/AD8616/AD8618 are single/dual/quad, rail-to-
rail, input and output, single-supply amplifiers featuring very
low offset voltage, wide signal bandwidth, and low input voltage
and current noise. The parts use a patented trimming technique
that achieves superior precision without laser trimming. The
AD8615/AD8616/AD8618 are fully specified to operate from
2.7 V to 5 V single supplies.
The combination of >20 MHz bandwidth, low offset, low noise,
and low input bias current makes these amplifiers useful in a
wide variety of applications. Filters, integrators, photodiode
amplifiers, and high impedance sensors all benefit from the
combination of performance features. AC applications benefit from
the wide bandwidth and low distortion. The AD8615/AD8616/
AD8618 offer the highest output drive capability of the DigiTrim®
family, which is excellent for audio line drivers and other low
impedance applications.
Applications for the parts include portable and low powered
instrumentation, audio amplification for portable devices,
portable phone headsets, bar code scanners, and multipole
filters. The ability to swing rail-to-rail at both the input and
output enables designers to buffer CMOS ADCs, DACs, ASICs,
and other wide output swing devices in single-supply systems.
PIN CONFIGURATIONS
OUT 1
5 V+
AD8615
V– 2
TOP VIEW
+IN 3 (Not to Scale) 4 –IN
Figure 1. 5-Lead TSOT-23 (UJ-5)
OUT A 1
8 V+
–IN A 2 AD8616 7 OUT B
+IN A 3 TOP VIEW 6 –IN B
V– 4 (Not to Scale) 5 +IN B
Figure 2. 8-Lead MSOP (RM-8)
OUT A 1
8 V+
–IN A 2 AD8616 7 OUT B
+IN A 3 TOP VIEW 6 –IN B
V– 4 (Not to Scale) 5 +IN B
Figure 3. 8-Lead SOIC (R-8)
OUT A
–IN A
+IN A
V+
+IN B
–IN B
OUT B
1 14
AD8618
TOP VIEW
(Not to Scale)
78
OUT D
–IN D
+IN D
V–
+IN C
–IN C
OUT C
Figure 4. 14-Lead TSSOP (RU-14)
OUT A 1
14 OUT D
–IN A 2
13 –IN D
+IN A 3 AD8618 12 +IN D
V+ 4 TOP VIEW 11 V–
+IN B 5 (Not to Scale) 10 +IN C
–IN B 6
9 –IN C
OUT B 7
8 OUT C
Figure 5. 14-Lead SOIC (R-14)
The AD8615/AD8616/AD8618 are specified over the extended
industrial temperature range (−40°C to +125°C). The AD8615
is available in 5-lead TSOT-23 package. The AD8616 is available
in 8-lead MSOP and narrow SOIC surface-mount packages; the
MSOP version is available in tape and reel only. The AD8618 is
available in 14-lead SOIC and TSSOP packages.
Rev. G
Document Feedback
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.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700 ©2004–2014 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com






AD8615 Datasheet, Funktion
AD8615/AD8616/AD8618
TYPICAL PERFORMANCE CHARACTERISTICS
2200
2000
1800
VS = 5V
TA = 25°C
VCM = 0V TO 5V
1600
1400
1200
1000
800
600
400
200
0
–700 –500 –300 –100 100 300 500 700
OFFSET VOLTAGE (µV)
Figure 6. Input Offset Voltage Distribution
22
20 VS = ±2.5V
TA = –40°C TO +125°C
18 VCM = 0V
16
14
12
10
8
6
4
2
0
0 2 4 6 8 10 12
TCVOS (µV/°C)
Figure 7. Offset Voltage Drift Distribution
500
VS = 5V
400 TA = 25°C
300
200
100
0
–100
–200
–300
–400
–500
0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
COMMON-MODE VOLTAGE (V)
Figure 8. Input Offset Voltage vs. Common-Mode Voltage
(200 Units, Five Wafer Lots Including Process Skews)
Data Sheet
350
VS = ±2.5V
300
250
200
150
100
50
0
0 25 50 75 100
TEMPERATURE (°­C)
Figure 9. Input Bias Current vs. Temperature
125
1000
VS = 5V
TA = 25°C
100
10
SOURCE
SINK
1
0.1
0.001
0.01
0.1 1
ILOAD (mA)
10 100
Figure 10. Output Voltage to Supply Rail vs. Load Current
120
VS = 5V
100
80
10mA LOAD
60
40
20
1mA LOAD
0
–40 –25 –10 5 20 35 50 65 80 95 110 125
TEMPERATURE (°C)
Figure 11. Output Saturation Voltage vs. Temperature
Rev. G | Page 6 of 20

6 Page









AD8615 pdf, datenblatt
AD8615/AD8616/AD8618
OVERLOAD RECOVERY TIME
Overload recovery time is the time it takes the output of the
amplifier to come out of saturation and recover to its linear region.
Overload recovery is particularly important in applications where
small signals must be amplified in the presence of large transients.
Figure 40 and Figure 41 show the positive and negative overload
recovery times of the AD8616. In both cases, the time elapsed
before the AD8616 comes out of saturation is less than 1 μs. In
addition, the symmetry between the positive and negative recovery
times allows excellent signal rectification without distortion to the
output signal.
+2.5V
VS = ±2.5V
RL = 10k
AV = 100
VIN = 50mV
0V
0V
–50mV
TIME (1µs/DIV)
Figure 40. Positive Overload Recovery
VS = ±2.5V
RL = 10k
AV = 100
VIN = 50mV
2.5V
0V
0V
+50mV
TIME (1µs/DIV)
Figure 41. Negative Overload Recovery
D/A CONVERSION
The AD8616 can be used at the output of high resolution DACs.
The low offset voltage, fast slew rate, and fast settling time make
the part suitable to buffer voltage output or current output
DACs.
Figure 42 shows an example of the AD8616 at the output of the
AD5542. The AD8616’s rail-to-rail output and low distortion
help maintain the accuracy needed in data acquisition systems
and automated test equipment.
5V
0.1µF
2.5V
10µF
+
0.1µF
Data Sheet
SERIAL
INTERFACE
VDD REFF REFS
CS
DIN
SCLK
AD5542
VOUT
LDAC
DGND
AGND
1/2
AD8616
UNIPOLAR
OUTPUT
Figure 42. Buffering DAC Output
LOW NOISE APPLICATIONS
Although the AD8618 typically has less than 8 nV/√Hz of voltage
noise density at 1 kHz, it is possible to reduce it further. A simple
method is to connect the amplifiers in parallel, as shown in
Figure 43. The total noise at the output is divided by the square
root of the number of amplifiers. In this case, the total noise is
approximately 4 nV/√Hz at room temperature. The 100 Ω
resistor limits the current and provides an effective output
resistance of 50 Ω.
VIN
3
V+ 1
R3
R1 2
V–
100
10
R2
1k
3
R4 2
10
V+ 1
V–
R5
1k
R6
100
VOUT
3
R7 2
10
V+ 1
V–
R8
R9
100
1k
3
R10 2
10
V+ 1
V–
R11
R12
100
1k
Figure 43. Noise Reduction
Rev. G | Page 12 of 20

12 Page





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