a
FEATURES
DC Performance
400 A max Quiescent Current
10 pA max Bias Current, Warmed Up (AD648C)
300 V max Offset Voltage (AD648C)
3 V/ C max Drift (AD648C)
2 V p-p Noise, 0.1 Hz to 10 Hz
AC Performance
1.8 V/ s Slew Rate
1 MHz Unity Gain Bandwidth
Available in Plastic Mini-DIP, Cerdip, Plastic SOIC
and Hermetic Metal Can Packages
MIL-STD-883B Parts Available
Surface Mount (SOIC) Package Available in Tape and
Reel in Accordance with EIA-481A Standard
Single Version: AD548
PRODUCT DESCRIPTION
Dual Precision,
Low Power BiFET Op Amp
AD648
CONNECTION DIAGRAMS
The AD648 is a matched pair of low power, precision mono-
lithic operational amplifiers. It offers both low bias current
(10 pA max, warmed up) and low quiescent current (400
µA
max) and is fabricated with ion-implanted FET and laser wafer
trimming technologies. Input bias current is guaranteed over the
AD648’s entire common-mode voltage range.
The economical J grade has a maximum guaranteed offset volt-
age of less than 2 mV and an offset voltage drift of less than
20
µV/°C.
The C grade reduces offset voltage to less than
0.30 mV and offset voltage drift to less than 3
µV/°C.
This level
of dc precision is achieved utilizing Analog’s laser wafer drift
trimming process. The combination of low quiescent current
and low offset voltage drift minimizes changes in input offset
voltage due to self-heating effects. Five additional grades are
offered over the commercial, industrial and military temperature
ranges.
The AD648 is recommended for any dual supply op amp appli-
cation requiring low power and excellent dc and ac perfor-
mance. In applications such as battery-powered, precision
instrument front ends and CMOS DAC buffers, the AD648’s
excellent combination of low input offset voltage and drift, low
bias current and low 1/f noise reduces output errors. High
common-mode rejection (86 dB, min on the “C” grade) and
high open-loop gain ensures better than 12-bit linearity in high
impedance, buffer applications.
The AD648 is pinned out in a standard dual op amp configura-
tion and is available in seven performance grades. The AD648J
and AD648K are rated over the commercial temperature range
of 0°C to +70°C. The AD648A, AD648B and AD648C are
rated over the industrial temperature range of –40°C to +85°C.
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.
The AD648S and AD648T are rated over the military tempera-
ture range of –55°C to +125°C and are available processed to
MIL-STD-883B, Rev. C.
The AD648 is available in an 8-pin plastic mini-DIP, cerdip,
SOIC, TO-99 metal can, or in chip form.
PRODUCT HIGHLIGHTS
1. A combination of low supply current, excellent dc and ac
performance and low drift makes the AD648 the ideal op
amp for high performance, low power applications.
2. The AD648 is pin compatible with industry standard dual op
amps such as the LF442, TL062, and AD642, enabling
designers to improve performance while achieving a reduc-
tion in power dissipation of up to 85%.
3. Guaranteed low input offset voltage (2 mV max) and drift
(20
µV/°C
max) for the AD648J are achieved utilizing Analog
Devices’ laser drift trimming technology.
4. Analog Devices specifies each device in the warmed-up con-
dition, insuring that the device will meet its published specifi-
cations in actual use.
5. Matching characteristics are excellent for all grades. The
input offset voltage matching between amplifiers in the
AD648J is within 2 mV, for the C grade matching is within
0.4 mV.
6. Crosstalk between amplifiers is less than –120 dB at 1 kHz.
7. The AD648 is available in chip form.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 617/329-4700
Fax: 617/326-8703
AD648
NOTES
1
Input Offset Voltage specifications are guaranteed after 5 minutes of operation at T
A
= +25°C.
2
Bias Current specifications are guaranteed maximum at either input after 5 minutes of operation at T
A
= +25°C. For higher temperature, the current doubles
every 10°C.
3
Matching is defined as the difference between parameters of the two amplifiers.
4
Defined as voltages between inputs, such that neither exceeds
±
10 V from ground.
Specifications subject to change without notice.
ABSOLUTE MAXIMUM RATINGS
1
Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
±
18 V
Internal Power Dissipation
2
. . . . . . . . . . . . . . . . . . . . 500 mW
Input Voltage
3
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
±
18 V
Output Short Circuit Duration . . . . . . . . . . . . . . . . . Indefinite
Differential Input Voltage . . . . . . . . . . . . . . . . . . +V
S
and –V
S
Storage Temperature Range (Q, H) . . . . . . . . –65°C to +150°C
Storage Temperature Range
(N, R) . . . . . . . . –65°C to +125°C
Operating Temperature Range
AD648J/K . . . . . . . . . . . . . . . . . . . . . . . . . . . 0°C to +70°C
AD648A/B/C . . . . . . . . . . . . . . . . . . . . . . . . –40°C to +85°C
AD648S/T . . . . . . . . . . . . . . . . . . . . . . . . . –55°C to +125°C
Lead Temperature Range (Soldering 60 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
Thermal Characteristics:
8-Pin Plastic Package:
θ
JA
= 165°C/Watt
8-Pin Cerdip Package:
θ
JC
= 22°C/Watt;
θ
JA
= 110°C/Watt
8-Pin Metal Package:
θ
JC
= 65°C/Watt;
θ
JA
= 150°C/Watt
8-Pin SOIC Package:
θ
JC
= 42°C/Wat;
θ
JA
= 160°C/Watt
3
For supply voltages less than
±
18 V, the absolute maximum input voltage is equal
to the supply voltage.
METALIZATION PHOTOGRAPH
Contact factory for latest dimensions.
Dimensions shown in inches and (mm).
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 AD648 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.
WARNING!
ESD SENSITIVE DEVICE
REV. C
–3–
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