Analog Devices AD823 Datasheet
Dual, 16 MHz, Rail-to-Rail
1
2
3
4
8
7
6
5
AD823
OUT1
+IN2
–IN2
OUT2
+V
S
–IN1
+IN1
–V
S
FREQUENCY – Hz
–8
OUTPUT – dB
1k
–6
–7
2
1
10k 100k 1M
VS = +5V
G = +1
–5
–4
–3
–2
–1
0
10M
a
FEATURES
Single Supply Operation
Output Swings Rail to Rail
Input Voltage Range Extends Below Ground
Single Supply Capability from +3 V to +36 V
High Load Drive
Capacitive Load Drive of 500 pF, G = +1
Output Current of 15 mA, 0.5 V from Supplies
Excellent AC Performance on 2.6 mA/Amplifier
–3 dB Bandwidth of 16 MHz, G = +1
350 ns Settling Time to 0.01% (2 V Step)
Slew Rate of 22 V/ms
Good DC Performance
800 mV Max Input Offset Voltage
2 mV/8C Offset Voltage Drift
25 pA Max Input Bias Current
Low Distortion
–108 dBc Worst Harmonic @ 20 kHz
Low Noise
16 nV/√
No Phase Inversion with Inputs to the Supply Rails
Hz @ 10 kHz
FET Input Amplifier
AD823
CONNECTION DIAGRAM
8-Pin Plastic Mini-DIP
and
8-Lead SOIC
The AD823 is available over the industrial temperature range of
–40°C to +85°C and is offered in both 8-pin plastic DIP and
SOIC packages.
RL = 100kΩ
= 50pF
C
L
V
= +3V
3V
S
APPLICATIONS
Battery Powered Precision Instrumentation
Photodiode Preamps
Active Filters
12- to 16-Bit Data Acquisition Systems
Medical Instrumentation
PRODUCT DESCRIPTION
The AD823 is a dual precision, 16 MHz, JFET input op amp
that can operate from a single supply of +3.0 V to +36 V, or
dual supplies of ±1.5 V to ±18 V. It has true single supply
capability with an input voltage range extending below ground
in single supply mode. Output voltage swing extends to within
50 mV of each rail for I
≤ 100 µA providing outstanding out-
OUT
put dynamic range.
Offset voltage of 800 µV max, offset voltage drift of 2 µV/°C,
input bias currents below 25 pA and low input voltage noise
provide dc precision with source impedances up to a Gigohm.
16 MHz, –3 dB bandwidth, –108 dB THD @ 20 kHz and
22 V/µs slew rate are provided with a low supply current of
2.6 mA per amplifier. The AD823 drives up to 500 pF of direct
capacitive load as a follower, and provides an output current of
15 mA, 0.5 V from the supply rails. This allows the amplifier to
handle a wide range of load conditions.
This combination of ac and dc performance, plus the outstanding load drive capability results in an exceptionally versatile amplifier for applications such as A/D drivers, high-speed active
filters, and other low voltage, high dynamic range systems.
REV. 0
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.
GND
500mV
200µs
Figure 1. Output Swing, VS = +3 V, G = +1
Figure 2. Small Signal Bandwidth, G = +1
© Analog Devices, Inc., 1995
One Technology Way, P.O. Box 9106, Norwood. MA 02062-9106, U.S.A.
Tel: 617/329-4700 Fax: 617/326-8703
AD823–SPECIFICATIONS
(@ TA = +25°C, VS = +5 V, RL = 2 kΩ to +2.5 V, unless otherwise noted)
AD823A
Parameter Conditions Min Typ Max Units
DYNAMIC PERFORMANCE
–3 dB Bandwidth, V
Full Power Response V
Slew Rate G = –1, V
Settling Time G = –1, V
≤ 0.2 V p-p G = +1 12 16 MHz
O
= 2 V p-p 3.5 MHz
O
= 4 V Step 14 22 V/µs
O
= 2 V Step
O
to 0.1% 320 ns
to 0.01% 350 ns
NOISE/DISTORTION PERFORMANCE
Input Voltage Noise f = 10 kHz 16 nV/√
Input Current Noise f = 1 kHz 1 fA/√
Harmonic Distortion R
= 600 Ω to 2.5 V, V
L
= 2 V p-p, –108 dBc
O
Hz
Hz
f = 20 kHz
Crosstalk
f = 1 kHz R
f = 1 MHz R
= 5 kΩ –130 dB
L
= 5 kΩ –93 dB
L
DC PERFORMANCE
Initial Offset 0.2 0.8 mV
Max Offset Over Temperature 0.3 2.0 mV
Offset Drift 2 µV/°C
Input Bias Current V
at T
MAX
= 0 V to +4 V 3 25 pA
CM
0.5 5 nA
Input Offset Current 220pA
at T
MAX
Open-Loop Gain V
T
to T
MIN
MAX
= 0.2 V to 4 V
O
R
= 2 kΩ 20 45 V/mV
L
20 V/mV
0.5 nA
INPUT CHARACTERISTICS
Input Common-Mode Voltage Range –0.2 to 3 –0.2 to 3.8 V
Input Resistance 10
13
Ω
Input Capacitance 1.8 pF
Common-Mode Rejection Ratio VCM = 0 V to 3 V 60 76 dB
OUTPUT CHARACTERISTICS
Output Voltage Swing
I
= ±100 µA 0.025 to 4.975 V
L
I
= ±2 mA 0.08 to 4.92 V
L
I
= ±10 mA 0.25 to 4.75 V
L
Output Current V
= 0.5 V to 4.5 V 16 mA
OUT
Short Circuit Current Sourcing to 2.5 V 40 mA
Sinking to 2.5 V 30 mA
Capacitive Load Drive G = +1 500 pF
POWER SUPPLY
Operating Range +3 +36 V
Quiescent Current T
Power Supply Rejection Ratio VS = +5 V to +15 V, T
Specification subject to change without notice.
MIN
to T
, Total 5.2 5.6 mA
MAX
MIN
to T
MAX
70 80 dB
–2–
REV. 0
AD823
SPECIFICATIONS
(@ TA = +25°C, VS = +3.3 V, RL = 2 kΩ to +1.65 V, unless otherwise noted)
AD823A
Parameter Conditions Min Typ Max Units
DYNAMIC PERFORMANCE
–3 dB Bandwidth, V
Full Power Response V
Slew Rate G = –1, V
Settling Time G = –1, V
≤ 0.2 V p-p G = +1 12 15 MHz
O
= 2 V p-p 3.2 MHz
O
= 2 V Step 13 20 V/µs
O
= 2 V Step
O
to 0.1% 250 ns
to 0.01% 300 ns
NOISE/DISTORTION PERFORMANCE
Input Voltage Noise f = 10 kHz 16 nV/√
Input Current Noise f = 1 kHz 1 fA/√
Harmonic Distortion R
= 100 Ω, V
L
= 2 V p-p, f = 20 kHz –93 dBc
O
Hz
Hz
Crosstalk
f = 1 kHz R
f = 1 MHz R
= 5 kΩ –130 dB
L
= 5 kΩ –93 dB
L
DC PERFORMANCE
Initial Offset 0.2 1.5 mV
Max Offset Over Temperature 0.5 2.5 mV
Offset Drift 2 µV/°C
Input Bias Current V
at T
MAX
= 0 V to +2 V 3 25 pA
CM
0.5 5 nA
Input Offset Current 220pA
at T
MAX
Open-Loop Gain V
T
to T
MIN
MAX
= 0.2 V to 2 V
O
R
= 2 kΩ 15 30 V/mV
L
12 V/mV
0.5 nA
INPUT CHARACTERISTICS
Input Common-Mode Voltage Range –0.2 to 1 –0.2 to 1.8 V
Input Resistance 10
13
Ω
Input Capacitance 1.8 pF
Common-Mode Rejection Ratio VCM = 0 V to 1 V 54 70 dB
OUTPUT CHARACTERISTICS
Output Voltage Swing
I
= ±100 µA 0.025 to 3.275 V
L
I
= ±2 mA 0.08 to 3.22 V
L
I
= ±10 mA 0.25 to 3.05 V
L
Output Current V
= 0.5 V to 2.5 V 15 mA
OUT
Short Circuit Current Sourcing to 1.5 V 40 mA
Sinking to 1.5 V 30 mA
Capacitive Load Drive G = +1 500 pF
POWER SUPPLY
Operating Range +3 +36 V
Quiescent Current T
Power Supply Rejection Ratio VS = +3.3 V to +15 V, T
Specification subject to change without notice.
MIN
to T
, Total 5.0 5.7 mA
MAX
MIN
to T
70 80 dB
MAX
REV. 0
–3–
AD823–SPECIFICATIONS
(@ TA = +25°C, VS = ±15 V, RL = 2 kΩ to 0 V, unless otherwise noted)
AD823A
Parameter Conditions Min Typ Max Units
DYNAMIC PERFORMANCE
–3 dB Bandwidth, V
Full Power Response V
Slew Rate G = –1, V
Settling Time G = –1, V
≤ 0.2 V p-p G = +1 12 16 MHz
O
= 2 V p-p 4 MHz
O
= 10 V Step 17 25 V/µs
O
= 10 V Step
O
to 0.1% 550 ns
to 0.01% 650 ns
NOISE/DISTORTION PERFORMANCE
Input Voltage Noise f = 10 kHz 16 nV/√
Input Current Noise f = 1 kHz 1 fA/√
Harmonic Distortion R
= 600 Ω, V
L
= 10 V p-p, –90 dBc
O
Hz
Hz
f = 20 kHz
Crosstalk
f = 1 kHz R
f = 1 MHz R
= 5 kΩ –130 dB
L
= 5 kΩ –93 dB
L
DC PERFORMANCE
Initial Offset 0.7 3.5 mV
Max Offset Over Temperature 1.0 7 mV
Offset Drift 2 µV/°C
Input Bias Current V
at T
MAX
= 0 V 5 30 pA
CM
V
= –10 V 60 pA
CM
VCM = 0 V 0.5 5 nA
Input Offset Current 220pA
at T
MAX
Open-Loop Gain V
T
to T
MIN
MAX
= +10 V to –10 V
O
R
= 2 kΩ 30 60 V/mV
L
30 V/mV
0.5 nA
INPUT CHARACTERISTICS
Input Common-Mode Voltage Range –15.2 to 13 –15.2 to 13.8 V
Input Resistance 10
13
Ω
Input Capacitance 1.8 pF
Common-Mode Rejection Ratio VCM = –15 V to +13 V 66 82 dB
OUTPUT CHARACTERISTICS
Output Voltage Swing
I
= ±100 µA –14.95 to +14.95 V
L
I
= ±2 mA –14.92 to +14.92 V
L
I
= ±10 mA –14.75 to +14.75 V
L
Output Current V
= –14.5 V to +14.5 V 17 mA
OUT
Short Circuit Current Sourcing to 0 V 80 mA
Sinking to 0 V 60 mA
Capacitive Load Drive G = +1 500 pF
POWER SUPPLY
Operating Range +3 +36 V
Quiescent Current T
Power Supply Rejection Ratio VS = +5 V to +15 V, T
Specification subject to change without notice.
MIN
to T
, Total 7.0 8.4 mA
MAX
MIN
to T
70 80 dB
MAX
–4–
REV. 0
AD823
MAXIMUM POWER DISSIPATION – Watts
AMBIENT TEMPERATURE – °C
2.0
1.5
0
–50 90–40 –30 –20 –10 0 10 20 30 50 60 70 8040
1.0
0.5
8-PIN MINI-DIP PACKAGE
8-PIN SOIC PACKAGE
TJ = +150°C
WARNING!
ESD SENSITIVE DEVICE
ABSOLUTE MAXIMUM RATINGS
Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +36 V
Internal Power Dissipation
2
1
Plastic Package (N) . . . . . . . . . . . . . . . . . . . . . . . . 1.3 Watts
Small Outline Package (R) . . . . . . . . . . . . . . . . . . . 0.9 Watts
Input Voltage (Common Mode) . . . . . . . . . . . . . . . . . . . . ±V
S
Differential Input Voltage . . . . . . . . . . . . . . . . . . . . . . . ±1.2 V
Output Short Circuit Duration
. . . . . . . . . . . . . . . . . . . . . . Observe Power Derating Curves
Storage Temperature Range N, 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
permanent damage to the device. This is a stress rating only and 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-Pin Plastic Package: θJA = 90°C/Watt
8-Pin SOIC Package: θJA = 160°C/Watt
ORDERING GUIDE
Model Temperature Range Package Description Package Option
AD823AN –40°C to +85°C 8-Pin Plastic DIP N-8
AD823AR –40°C to +85°C 8-Pin Plastic SOIC SO-8
AD823AR-REEL –40°C to +85°C SOIC on Reel SO-8
Figure 3. Maximum Power Dissipation vs. Temperature
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 AD823 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. 0
–5–
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