Low Cost, General-Purpose
–
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
High Speed JFET Amplifier
AD825
CONNECTION DIAGRAMS
NC
1
AD825
–IN
2
TOP VIEW
3
+IN
(Not to Scale)
V
4
S
NC = NO CONNECT
Figure 1. 8-Lead Plastic SOIC (R) Package
1
NC
NC
2
NC
3
–INPUT
+INPUT
–V
AD825
4
TOP VIEW
5
(Not to Scale)
6
S
7
NC
8
NC
NC = NO CONNECT
Figure 2. 16-Lead Plastic SOIC (R-16) Package
NC
8
+V
7
S
6
OUTPUT
NC
5
00876-E-001
16
NC
NC
15
NC
14
+V
13
S
OUTPUT
12
11
NC
10
NC
9
NC
00876-E-002
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.
Rev. F
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. Trademarks and
registered trademarks are the property of their respective owners.
10V 200ns
10V
Figure 3. Performance with Rail-to-Rail Input Signals
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Fax: 781.326.8703 © 2004 Analog Devices, Inc. All rights reserved.
www.analog.com
00876-E-003
AD825
TABLE OF CONTENTS
Specifications..................................................................................... 3
REVISION HISTORY
Absolute Maximum Ratings............................................................ 5
Pin Configurations ........................................................................... 5
ESD Caution.................................................................................. 5
Typical Performance Characteristics............................................. 6
Driving Capacitive Loads ..............................................................10
Theory of Operation ...................................................................... 10
Input Consideration................................................................... 10
Grounding and Bypassing .........................................................10
Second-Order Low-Pass Filter.................................................. 11
Outline Dimensions ....................................................................... 12
Ordering Guide........................................................................... 12
10/04—Data Sheet Changed from Rev. E to Rev. F
Changes to Figure 1......................................................................... 1
Changes to Figure 4......................................................................... 5
Changes to Figure 21....................................................................... 8
3/04—Data Sheet Changed from Rev. D to Rev. E
Changes to Specifications............................................................... 3
Addition of 16-Lead SOIC Pin Configuration............................ 5
Changes to Figure 27....................................................................... 9
Updated Outline Dimensions...................................................... 12
Updated Ordering Guide.............................................................. 12
2/01—Data Sheet Changed from Rev. C to Rev. D
Addition of 16-lead SOIC package (R-16)
Connection Diagram ...................................................................... 4
Addition to Absolute Maximum Ratings .....................................4
Addition to Ordering Guide (R-16).............................................. 4
Addition of 16-lead SOIC package (R-16)
Outline Dimensions...................................................................... 11
Rev. F | Page 2 of 12
AD825
SPECIFICATIONS
All limits are determined to be at least four standard deviations away from mean value. At TA = 25°C, VS = ±15 V, unless otherwise noted.
Table 1.
AD825A
Parameter Conditions VS Min Typ Max Unit
DYNAMIC PERFORMANCE
Unity Gain Bandwidth ±15 V 23 26 MHz
Bandwidth for 0.1 dB Flatness Gain = +1 ±15 V 18 21 MHz
−3 dB Bandwidth Gain = +1 ±15 V 44 46 MHz
Slew Rate R
Settling Time to 0.1% 0 V to 10 V Step, AV = −1 ±15 V 150 180 ns
to 0.1% 0 V to 10 V Step, AV = −1 ±15 V 180 220 ns
Total Harmonic Distortion FC = 1 MHz, G = −1 ±15 V −77 dB
Differential Gain Error NTSC ±15 V 1.3 %
(R
= 150 Ω) Gain = +2
LOAD
Differential Phase Error NTSC ±15 V 2.1 Degrees
(R
= 150 Ω) Gain = +2
LOAD
INPUT OFFSET VOLTAGE ±15 V 1 2 mV
T
Offset Drift 10 µV/°C
INPUT BIAS CURRENT ±15 V 15 40 pA
T
T
INPUT OFFSET CURRENT ±15 V 20 30 pA
T
T
OPEN-LOOP GAIN V
R
V
R
V
R
COMMON-MODE REJECTION VCM = ±10 ±15 V 71 80 dB
INPUT VOLTAGE NOISE f = 10 kHz ±15 V 12
INPUT CURRENT NOISE f = 10 kHz ±15 V 10
INPUT COMMON-MODE VOLTAGE RANGE ±15 V ±13.5 V
OUTPUT VOLTAGE SWING R
R
Output Current ±15 V 50 mA
Short-Circuit Current ±15 V 100 mA
INPUT RESISTANCE 5 ×1011 Ω
INPUT CAPACITANCE 6 pF
OUTPUT RESISTANCE Open Loop 8 Ω
POWER SUPPLY
Quiescent Current ±15 V 6.5 7.2 mA
T
= 1 kΩ, G = +1 ±15 V 125 140 V/µs
LOAD
to T
MIN
MAX
MIN
MAX
5 pA
MIN
MAX
= ±10 V ±15 V
OUT
= 1 kΩ 70 76 dB
LOAD
= ±7.5 V ±15 V
OUT
= 1 kΩ 70 76 dB
LOAD
= ±7.5 V ±15 V
OUT
= 150 kΩ (50 mA Output) 68 74 dB
LOAD
= 1 kΩ ±15 V 13 ±13.3 V
LOAD
= 500 Ω ±15 V 12.9 ±13.2 V
LOAD
to T
MIN
±15 V 7.5 mA
MAX
5 mV
5 pA
700 pA
440 pA
nV/√
fA/√
Hz
Hz
Rev. F | Page 3 of 12
AD825
All limits are determined to be at least four standard deviations away from mean value. At TA = 25°C, VS = ±5 V unless otherwise noted.
Table 2.
AD825A
Parameter Conditions VS Min Typ Max Unit
DYNAMIC PERFORMANCE
Unity Gain Bandwidth ±5 V 18 21 MHz
Bandwidth for 0.1 dB Flatness Gain = +1 ±5 V 8 10 MHz
−3 dB Bandwidth Gain = +1 ±5 V 34 37 MHz
Slew Rate R
Settling Time to 0.1% −2.5 V to +2.5 V ±5 V 75 90 ns
to 0.01% −2.5 V to +2.5 V ±5 V 90 110 ns
Total Harmonic Distortion FC = 1 MHz, G = −1 ±5 V −76 dB
Differential Gain Error NTSC ±5 V 1.2 %
(R
= 150 Ω) Gain = +2
LOAD
Differential Phase Error NTSC ±5 V 1.4 Degrees
(R
= 150 Ω) Gain = +2
LOAD
INPUT OFFSET VOLTAGE ±5 V 1 2 mV
T
Offset Drift 10 µV/°C
INPUT BIAS CURRENT ±5 V 10 30 pA
T
T
INPUT OFFSET CURRENT ±5 V 15 25 pA
T
Offset Current Drift T
OPEN-LOOP GAIN V
R
R
COMMON-MODE REJECTION VCM = ±2 V ±5 V 69 80 dB
INPUT VOLTAGE NOISE f = 10 kHz ±5 V 12
INPUT CURRENT NOISE f = 10 kHz ±5 V 10
INPUT COMMON-MODE VOLTAGE RANGE ±5 V ± 3.5 V
OUTPUT VOLTAGE SWING R
R
Output Current ±5 V 50 mA
Short-Circuit Current 80 mA
INPUT RESISTANCE 5 ×1011 Ω
INPUT CAPACITANCE 6 pF
OUTPUT RESISTANCE Open Loop 8 Ω
POWER SUPPLY
Quiescent Current ±5 V 6.2 6.8 mA
T
POWER SUPPLY REJECTION VS = ±5 V to ±15 V 76 88 dB
= 1 kΩ, G = −1 ±5 V 115 130 V/µs
LOAD
to T
MIN
MAX
5 pA
MIN
MAX
MIN
MAX
= ±2.5 ±5 V
OUT
= 500 Ω 64 66 dB
LOAD
= 150 Ω 64 66 dB
LOAD
= 500 Ω +3.2 ±3.4 V
LOAD
= 150 Ω ±5 V +3.1 ±3.2 V
LOAD
to T
MIN
MAX
5 mV
600 pA
5 pA
280 pA
±5 V 7.5 mA
nV/√
fA/√
Hz
Hz
Rev. F | Page 4 of 12
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