Analog Devices AD825 Datasheet

Low Cost, General Purpose

a

FEATURES
High Speed

41 MHz, –3 dB Bandwidth
125 V/␮s 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: ⴞ5 V to ⴞ15 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
CCD
Low Distortion Filters
Mixed Gain Stages
Audio Amplifier
Photo Detector Interface
ADC Input Buffer
DAC Output Buffer

High Speed JFET Amplifier

AD825

CONNECTION DIAGRAM

8-Lead Plastic SOIC (R) Package

NC

–IN

+IN

–V

1

2

3

S

4

AD825

TOP VIEW

(Not to Scale)

NC = NO CONNECT

8

7

6

5

NC

+V

S

OUTPUT

NC

PRODUCT 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
ultralow 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 sup-

ply current of 6.5 mA with excellent ac characteristics under all
supply conditions, makes the AD825 well suited for many
demanding applications.

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
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.

Figure 1. Performance with Rail-to-Rail Input Signals

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: [phone] World Wide Web Site: http://www.analog.com
Fax: [phone] © Analog Devices, Inc., 1999

AD825–SPECIFICATIONS

(@ TA = +25ⴗC, VS = ⴞ15 V unless otherwise noted)

␣␣␣␣␣␣␣␣ AD825A

Parameter Conditions V

S

Min Typ Max Units

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–10 V Step, A

Settling Time to 0.01% 0 V–10 V Step, A

Total Harmonic Distortion F

= 1 kΩ, G = 1 ±15 V 125 140 V/µs

LOAD

= 1 MHz, G = –1 ±15 V –77 dB

C

= –1 ±15 V 150 180 ns

V

= –1 ±15 V 180 220 ns

V

Differential Gain Error NTSC ±15 V 1.3 %

= 150 Ω) Gain = +2

(R

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

MIN

to T

MAX

5mV

Offset Drift 10 µV/°C

INPUT BIAS CURRENT ±15 V 15 40 pA

T
T

MIN

MAX

5pA

700 pA

INPUT OFFSET CURRENT ±15 V 20 30 pA

OPEN LOOP GAIN V

T

MIN

T

MAX

= ±10 V ±15 V

OUT

R

= 1 kΩ 70 76 dB

LOAD

V

= ±7.5 V ±15 V

OUT

= 1 kΩ 70 76 dB

R

LOAD

V

= ±7.5 V ±15 V

OUT

R

= 150 Ω 72 74 dB

LOAD

5pA

440 pA

(50 mA Output)

COMMON-MODE REJECTION V

= ±10 V ±15 V 71 80 dB

CM

INPUT VOLTAGE NOISE f = 10 kHz ±15 V 12 nV/√Hz
INPUT CURRENT NOISE f = 10 kHz ±15 V 10 fA/√Hz

INPUT COMMON-MODE

VOLTAGE RANGE ±15 V ±13.5 V

OUTPUT VOLTAGE SWING R

= 1 kΩ±15 V 13 ±13.3 V

LOAD

R

= 500 Ω±15 V 12.9 ±13.2 V

LOAD

Output Current ±15 V 50 mA
Short-Circuit Current ±15 V 100 mA

INPUT RESISTANCE 5 × 10

11

Ω

INPUT CAPACITANCE 6pF

OUTPUT RESISTANCE Open Loop 8 Ω

POWER SUPPLY

Quiescent Current ±15 V 6.5 7.2 mA

T

to T

MIN

NOTES
All limits are determined to be at least four standard deviations away from mean value.

Specifications subject to change without notice.

MAX

–2–

±15 V 7.5 mA

.

REV. C

SPECIFICATIONS

Parameter Conditions V

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

Settling Time to 0.01% –2.5 V to +2.5 V ±5 V 90 110 ns

Total Harmonic Distortion F

Differential Gain Error NTSC ±5 V 1.2 %

= 150 Ω) Gain = +2

(R

LOAD

Differential Phase Error NTSC ±5 V 1.4 Degrees

(R

= 150 Ω) Gain = +2

LOAD

INPUT OFFSET VOLTAGE ±5 V 1 2 mV

Offset Drift 10 µV/°C

INPUT BIAS CURRENT ±5 V 10 30 pA

INPUT OFFSET CURRENT ±5 V 15 25 pA

Offset Current Drift T

OPEN LOOP GAIN V

COMMON-MODE REJECTION V

INPUT VOLTAGE NOISE f = 10 kHz ±5 V 12 nV/√Hz
INPUT CURRENT NOISE f = 10 kHz ±5 V 10 fA/√Hz

INPUT COMMON-MODE

VOLTAGE RANGE ±5 V ±3.5 V

OUTPUT VOLTAGE SWING R

Output Current ±5 V 50 mA
Short-Circuit Current ±5 V 80 mA

INPUT RESISTANCE 5 × 10

(@ TA = +25ⴗC, VS = ⴞ5 V unless otherwise noted)

S

= 1 kΩ, G = –1 ±5 V 115 130 V/µs

LOAD

= 1 MHz, G = –1 ±5 V –76 dB

C

T

to T

T
T

T

OUT

R

LOAD

R

LOAD

CM

LOAD

R

LOAD

MIN

MIN

MAX

MIN

MAX

MAX

= ±2.5 V ±5 V

= 500 Ω 64 66 dB
= 150 Ω 64 66 dB

= ±2 V ±5 V 69 80 dB

= 500 Ω 3.2 ±3.4 V
= 150 Ω±5 V 3.1 ±3.2 V

␣␣␣␣␣␣␣␣ AD825A
Min Typ Max Units

5mV

5pA

600 pA

5pA

280 pA

11

Ω

AD825

INPUT CAPACITANCE 6pF

OUTPUT RESISTANCE Open Loop 8 Ω

POWER SUPPLY

Quiescent Current ±5 V 6.2 6.8 mA

T

to T

MIN

POWER SUPPLY REJECTION V

NOTES
All limits are determined to be at least four standard deviations away from mean value.

Specifications subject to change without notice.

S

MAX

= ±5 V to ±15 V 76 88 dB

±5 V 7.5 mA

–3–REV. C

AD825

WARNING!

ESD SENSITIVE DEVICE

ABSOLUTE MAXIMUM RATINGS

Supply␣ Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±18␣ V

Internal␣ Power␣ Dissipation

2

1

Small␣ Outline␣ (R) . . . . . . . . . . . . . . . . . See Derating Curves

Input Voltage (Common Mode) . . . . . . . . . . . . . . . . . . . . ±V

Differential␣ Input␣ Voltage . . . . . . . . . . . . . . . . . . . . . . . . . ±V

S

S

Output Short Circuit Duration . . . . . . . . See Derating Curves

Storage Temperature Range R . . . . . . . . . . . –65°C to +125°C

Operating Temperature Range . . . . . . . . . . . –40°C to +85°C

Lead Temperature Range (Soldering␣ 10␣ sec) . . . . . . . .+300°C

NOTES

1

Stresses above those listed under Absolute Maximum Ratings may cause perma-

nent 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.

2

Specification is for device in free air: 8-lead SOIC package: θJA = 155°C/W.

PIN CONFIGURATION

1

NC

AD825

2

–IN

TOP VIEW

(Not to Scale)

+IN

3

–V

4

S

NC = NO CONNECT

2.0

1.5

1.0

0.5

MAXIMUM POWER DISSIPATION – Watts

0

–50 90–40 –30 –20 –10 0 10 20 30 50 60 70 8040

8-LEAD SOIC PACKAGE

AMBIENT TEMPERATURE – °C

8
7
6
5

NC
+V

S

OUTPUT
NC

TJ = +1508C

Figure 2. Maximum Power Dissipation vs. Temperature

ORDERING GUIDE

Temperature Package Package

Model Range Description Option

AD825AR –40°C to +85°C 8-Lead Plastic SOIC SO-8
AD825ACHIPS –40°C to +85°CDie
AD825AR-REEL –40°C to +85°C13
AD825AR-REEL7 –40°C to +85°C7

"

Tape and Reel SO-8

"

Tape and Reel SO-8

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 the AD825 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.

–4–

REV. C