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PDF AD825 Data sheet ( Hoja de datos )
| Número de pieza | AD825 | |
| Descripción | Low Cost/ General Purpose High Speed JFET Amplifier | |
| Fabricantes | Analog Devices | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de AD825 (archivo pdf) en la parte inferior de esta página. Total 12 Páginas | ||
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Data Sheet
FEATURES
High speed
41 MHz, −3 dB bandwidth
125 V/µs slew rate
80 ns settling time
Input bias current of 20 pA and noise current of 10 fA/√Hz
Input voltage noise of 12 nV/√Hz
Fully specified power supplies: ±5 V to ±15 V
Low distortion: −76 dB at 1 MHz
High output drive capability
Drives unlimited capacitance load
50 mA min output current
No phase reversal when input is at rail
Available in 8-lead SOIC
APPLICATIONS
CCDs
Low distortion filters
Mixed gain stages
Audio amplifiers
Photo detector interfaces
ADC input buffers
DAC output buffers
GENERAL DESCRIPTION
The AD825 is a superbly optimized operational amplifier for
high speed, low cost, and dc parameters, making it ideally
suited for a broad range of signal conditioning and data
acquisition applications. The ac performance, gain, bandwidth,
slew rate, and drive capability are all very stable over
temperature. The AD825 also maintains stable gain under
varying load conditions.
The unique input stage has ultralow input bias current and
input current noise. Signals that go to either rail on this high
performance input do not cause phase reversals at the output.
These features make the AD825 a good choice as a buffer for
MUX outputs, creating minimal offset and gain errors.
The AD825 is fully specified for operation with dual ±5 V and
±15 V supplies. This power supply flexibility, and the low
supply current of 6.5 mA with excellent ac characteristics under
all supply conditions, makes the AD825 well-suited for many
demanding applications.
Low Cost, General-Purpose
High Speed JFET Amplifier
AD825
CONNECTION DIAGRAMS
NC 1
8 NC
–IN 2 AD825 7 +VS
+IN
3
TOP VIEW
(Not to Scale)
6
OUTPUT
–VS 4
5 NC
NC = NO CONNECT
Figure 1. 8-Lead Plastic SOIC (R-8) Package
NC 1
16 NC
NC 2
15 NC
NC 3
14 NC
–INPUT 4 AD825 13 +VS
TOP VIEW
+INPUT 5 (Not to Scale) 12 OUTPUT
–VS 6
11 NC
NC 7
10 NC
NC 8
9 NC
NC = NO CONNECT
Figure 2. 16-Lead Plastic SOIC (RW-16) Package
10V 200ns
10V
Figure 3. Performance with Rail-to-Rail Input Signals
Rev. G
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.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
©2014 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com
1 page  
Data Sheet
ABSOLUTE MAXIMUM RATINGS
Table 3.
Parameter
Supply Voltage
Internal Power Dissipation1
Small Outline (R)
Input Voltage (Common Mode)
Differential Input Voltage
Output Short-Circuit Duration
Storage Temperature Range (R-8, RW-16)
Operating Temperature Range
Lead Temperature Range
(Soldering 10 sec)
Rating
±18 V
See Figure 6
±VS
±VS
See Figure 6
−65°C to +125°C
−40°C to +85°C
300°C
1 Specification is for device in free air:
8-lead SOIC package: θJA = 155°C/W
16-lead SOIC package: θJA = 85°C/W
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.
AD825
PIN CONFIGURATIONS
NC 1
8 NC
–IN 2 AD825 7 +VS
+IN
3
TOP VIEW
(Not to Scale)
6
OUTPUT
–VS 4
5 NC
NC = NO CONNECT
Figure 4. 8-Lead SOIC
NC 1
16 NC
NC 2
15 NC
NC 3
14 NC
–INPUT 4 AD825 13 +VS
TOP VIEW
+INPUT 5 (Not to Scale) 12 OUTPUT
–VS 6
11 NC
NC 7
10 NC
NC 8
9 NC
NC = NO CONNECT
Figure 5. 16-Lead SOIC
2.5
TJ = 150°C
2.0
16-LEAD SOIC PACKAGE
1.5
1.0
0.5 8-LEAD SOIC PACKAGE
0
–50 –40 –30 –20 –10 0 10 20 30 40 50 60 70 80 90
AMBIENT TEMPERATURE (°C)
Figure 6. Maximum Power Dissipation vs. Temperature
ESD CAUTION
Rev. G | Page 5 of 12
5 Page 
Data Sheet
SECOND-ORDER LOW-PASS FILTER
A second-order Butterworth low-pass filter can be implemented
using the AD825 as shown in Figure 33. The extremely low bias
currents of the AD825 allow the use of large resistor values and,
consequently, small capacitor values without concern for
developing large offset errors. Low current noise is another
factor in permitting the use of large resistors without having to
worry about the resultant voltage noise.
With the values shown, the corner frequency will be 1 MHz.
The equations for component selection are shown below. Note
that the noninverting input (and the inverting input) has an
input capacitance of 6 pF. As a result, the calculated value of C1
(12 pF) is reduced to 6 pF.
C1 =
2π
1.414
fCUTOFF R1
C2
( farads) =
2r
0.707
fCUTOFF R1
( )R1 = R2 = User Selected Typically 10 kΩ to 100 kΩ
A plot of the filter frequency response is shown in Figure 34;
better than 40 dB of high frequency rejection is provided.
AD825
C1
24pF
R1 R2
9.31kΩ 9.31kΩ
VIN
C2
6pF
+5V
C3
0.1µF
AD825
VOUT
C4
0.1µF
–5V
Figure 33. Second-Order Butterworth Low-Pass Filter
0
–10
–20
–30
–40
–50
–60
–70
–80
10k 100k 1M 10M 100M
FREQUENCY (Hz)
Figure 34. Frequency Response of Second-Order Butterworth Filter
Rev. G | Page 11 of 12
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet AD825.PDF ] | |
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