Low Cost, General-Purpose
High Speed JFET Amplifier
AD825
APPLICATIONS
CCDs
Low distortion filters
Mixed gain stages
Audio amplifiers
Photo detector interfaces
ADC input buffers
DAC output buffers
NC 1
NC
8
AD825
–IN 2
+VS
TOP VIEW
6 OUTPUT
(Not to Scale)
–VS 4
5 NC
7
+IN 3
NC = NO CONNECT
00876-E-001
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
CONNECTION DIAGRAMS
Figure 1. 8-Lead Plastic SOIC (R) Package
NC 1
16 NC
NC 2
15 NC
NC 3
–INPUT 4
14 NC
AD825
13 +VS
TOP VIEW
+INPUT 5 (Not to Scale) 12 OUTPUT
11 NC
–VS 6
NC 7
10 NC
NC 8
9
00876-E-002
FEATURES
NC
NC = NO CONNECT
Figure 2. 16-Lead Plastic SOIC (R-16) Package
GENERAL DESCRIPTION
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.
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
00876-E-003
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.
Figure 3. Performance with Rail-to-Rail Input Signals
© 2004 Analog Devices, Inc. All rights reserved.
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.
Parameter
DYNAMIC PERFORMANCE
Unity Gain Bandwidth
Bandwidth for 0.1 dB Flatness
−3 dB Bandwidth
Slew Rate
Settling Time to 0.1%
to 0.1%
Total Harmonic Distortion
Differential Gain Error
(RLOAD = 150 Ω)
Differential Phase Error
(RLOAD = 150 Ω)
INPUT OFFSET VOLTAGE
Conditions
Gain = +1
Gain = +1
RLOAD = 1 kΩ, G = +1
0 V to 10 V Step, AV = −1
0 V to 10 V Step, AV = −1
FC = 1 MHz, G = −1
NTSC
Gain = +2
NTSC
Gain = +2
VS
Min
±15 V
±15 V
±15 V
±15 V
±15 V
±15 V
±15 V
±15 V
23
18
44
125
AD825A
Typ
26
21
46
140
150
180
−77
1.3
2.1
±15 V
1
±15 V
10
15
40
20
700
30
TMIN
TMAX
±15 V
COMMON-MODE REJECTION
INPUT VOLTAGE NOISE
TMIN
TMAX
VOUT = ±10 V
RLOAD = 1 kΩ
VOUT = ±7.5 V
RLOAD = 1 kΩ
VOUT = ±7.5 V
RLOAD = 150 kΩ (50 mA Output)
VCM = ±10
f = 10 kHz
±15 V
±15 V
INPUT CURRENT NOISE
f = 10 kHz
±15 V
INPUT COMMON-MODE VOLTAGE RANGE
OUTPUT VOLTAGE SWING
Output Current
Short-Circuit Current
INPUT RESISTANCE
INPUT CAPACITANCE
OUTPUT RESISTANCE
POWER SUPPLY
Quiescent Current
RLOAD = 1 kΩ
RLOAD = 500 Ω
2
5
5
Rev. F | Page 3 of 12
MHz
MHz
MHz
V/µs
ns
ns
dB
%
440
mV
mV
µV/°C
pA
pA
pA
pA
pA
pA
±15 V
70
76
dB
70
76
dB
68
71
74
80
12
dB
dB
±15 V
±15 V
±15 V
±15 V
±15 V
±15 V
±15 V
Open Loop
TMIN to TMAX
Unit
Degrees
5
INPUT OFFSET CURRENT
OPEN-LOOP GAIN
180
220
±15 V
TMIN to TMAX
Offset Drift
INPUT BIAS CURRENT
Max
±15 V
±15 V
nV/√Hz
fA/√Hz
10
13
12.9
50
±13.5
±13.3
±13.2
V
V
V
mA
mA
Ω
pF
Ω
100
5 ×1011
6
8
6.5
7.2
7.5
mA
mA
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.
Parameter
DYNAMIC PERFORMANCE
Unity Gain Bandwidth
Bandwidth for 0.1 dB Flatness
−3 dB Bandwidth
Slew Rate
Settling Time to 0.1%
to 0.01%
Total Harmonic Distortion
Differential Gain Error
(RLOAD = 150 Ω)
Differential Phase Error
(RLOAD = 150 Ω)
INPUT OFFSET VOLTAGE
Conditions
Gain = +1
Gain = +1
RLOAD = 1 kΩ, G = −1
−2.5 V to +2.5 V
−2.5 V to +2.5 V
FC = 1 MHz, G = −1
NTSC
Gain = +2
NTSC
Gain = +2
VS
Min
±5 V
±5 V
±5 V
±5 V
±5 V
±5 V
±5 V
±5 V
18
8
34
115
AD825A
Typ
21
10
37
130
75
90
−76
1.2
1.4
±5 V
1
±5 V
10
10
30
15
600
25
TMIN
TMAX
INPUT OFFSET CURRENT
±5 V
COMMON-MODE REJECTION
INPUT VOLTAGE NOISE
±5 V
±5 V
INPUT CURRENT NOISE
f = 10 kHz
±5 V
INPUT COMMON-MODE VOLTAGE RANGE
OUTPUT VOLTAGE SWING
Output Current
Short-Circuit Current
INPUT RESISTANCE
INPUT CAPACITANCE
OUTPUT RESISTANCE
POWER SUPPLY
Quiescent Current
POWER SUPPLY REJECTION
Rev. F | Page 4 of 12
MHz
MHz
MHz
V/µs
ns
ns
dB
%
280
mV
mV
µV/°C
pA
pA
pA
pA
pA
pA
±5 V
64
64
69
±5 V
±5 V
66
66
80
12
dB
dB
dB
nV/√Hz
fA/√Hz
10
+3.2
+3.1
50
± 3.5
±3.4
±3.2
V
V
V
mA
mA
Ω
pF
Ω
80
5 ×1011
6
8
Open Loop
TMIN to TMAX
VS = ±5 V to ±15 V
2
5
5
±5 V
RLOAD = 500 Ω
RLOAD = 150 Ω
Unit
Degrees
5
TMIN
TMAX
VOUT = ±2.5
RLOAD = 500 Ω
RLOAD = 150 Ω
VCM = ±2 V
f = 10 kHz
Offset Current Drift
OPEN-LOOP GAIN
90
110
±5 V
TMIN to TMAX
Offset Drift
INPUT BIAS CURRENT
Max
±5 V
±5 V
6.2
76
88
6.8
7.5
mA
mA
dB
AD825
ABSOLUTE MAXIMUM RATINGS
PIN CONFIGURATIONS
Table 3.
NC 1
Rating
±18 V
NC
8
AD825
–IN 2
+VS
TOP VIEW
6 OUTPUT
(Not to Scale)
–VS 4
5 NC
7
See Figure 6
±VS
±VS
See Figure 6
−65°C to +125°C
−40°C to +85°C
300°C
NC = NO CONNECT
00876-E-001
+IN 3
Figure 4. 8-Lead SOIC
NC 1
16
NC
NC 2
15
NC
NC 3
14
NC
–INPUT 4
AD825
+VS
TOP VIEW
+INPUT 5 (Not to Scale) 12 OUTPUT
11 NC
–VS 6
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.
13
NC 7
10
NC
NC 8
9
NC
NC = NO CONNECT
00876-E-002
Parameter
Supply Voltage
Internal Power Dissipation1
Small Outline (R)
Input Voltage (Common Mode)
Differential Input Voltage
Output Short-Circuit Duration
Storage Temperature Range (R, R-16)
Operating Temperature Range
Lead Temperature Range
(Soldering 10 sec)
Figure 5. 16-Lead SOIC
Specification is for device in free air:
8-lead SOIC package: θJA = 155°C/W
16-lead SOIC package: θJA = 85°C/W
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
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. F | Page 5 of 12
00876-E-004
1
MAXIMUM POWER DISSIPATION (W)
2.5
AD825
OUTLINE DIMENSIONS
10.50 (0.4134)
10.10 (0.3976)
5.00 (0.1968)
4.80 (0.1890)
8
5
4.00 (0.1574)
3.80 (0.1497) 1
4
1.27 (0.0500)
BSC
0.25 (0.0098)
0.10 (0.0040)
9
16
7.60 (0.2992)
7.40 (0.2913)
6.20 (0.2440)
5.80 (0.2284)
1.75 (0.0688)
1.35 (0.0532)
0.51 (0.0201)
COPLANARITY
SEATING 0.31 (0.0122)
0.10
PLANE
8
1
1.27 (0.0500)
BSC
0.50 (0.0196)
× 45°
0.25 (0.0099)
0.30 (0.0118)
0.10 (0.0039)
8°
0.25 (0.0098) 0° 1.27 (0.0500)
0.40 (0.0157)
0.17 (0.0067)
COPLANARITY
0.10
0.51 (0.0201)
0.31 (0.0122)
10.65 (0.4193)
10.00 (0.3937)
2.65 (0.1043)
2.35 (0.0925)
SEATING
PLANE
0.75 (0.0295)
× 45°
0.25 (0.0098)
8°
0.33 (0.0130) 0°
0.20 (0.0079)
COMPLIANT TO JEDEC STANDARDS MS-012AA
CONTROLLING DIMENSIONS ARE IN MILLIMETERS; INCH DIMENSIONS
(IN PARENTHESES) ARE ROUNDED-OFF MILLIMETER EQUIVALENTS FOR
REFERENCE ONLY AND ARE NOT APPROPRIATE FOR USE IN DESIGN
COMPLIANT TO JEDEC STANDARDS MS-013AA
CONTROLLING DIMENSIONS ARE IN MILLIMETERS; INCH DIMENSIONS
(IN PARENTHESES) ARE ROUNDED-OFF MILLIMETER EQUIVALENTS FOR
REFERENCE ONLY AND ARE NOT APPROPRIATE FOR USE IN DESIGN
Figure 35. 8-Lead Standard Small Outline Package [SOIC]
Narrow Body (R-8)
Dimensions shown in millimeters (inches)
Figure 36. 16-Lead Standard Small Outline Package [SOIC]
Wide Body (R-16)
Dimensions shown in millimeters (inches)
ORDERING GUIDE
Model
AD825AR
AD825AR-REEL
AD825AR-REEL7
AD825AR-16
AD825AR-16-REEL
AD825AR-16-REEL7
AD825ARZ-161
AD825ARZ-16-REEL1
AD825ARZ-16-REEL71
AD825ACHIPS
1
1.27 (0.0500)
0.40 (0.0157)
Temperature Range
−40°C to +85°C
−40°C to +85°C
−40°C to +85°C
−40°C to +85°C
−40°C to +85°C
−40°C to +85°C
−40°C to +85°C
−40°C to +85°C
−40°C to +85°C
Package Description
8-Lead SOIC
8-Lead SOIC, 13" Tape and Reel
8-Lead SOIC, 7" Tape and Reel
16-Lead SOIC
16-Lead SOIC, 13" Tape and Reel
16-Lead SOIC, 7" Tape and Reel
16-Lead SOIC
16-Lead SOIC, 13" Tape and Reel
16-Lead SOIC, 7" Tape and Reel
Die
Z = Pb-free part.
Rev. F | Page 12 of 12
Package Option
R-8
R-8
R-8
R-16
R-16
R-16
R-16
R-16
R-16