AD648 ,Dual Precision, Low Power BiFET Op AmpFEATURES CONNECTION DIAGRAMDC PerformancePlastic Mini-Dip (N) Package,400 A max Quiescent CurrentP ..
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AD648
Dual Precision, Low Power BiFET Op Amp
REV.E
Dual Precision,
Low Power BiFET Op Amp
FEATURES
DC Performance
400 �A max Quiescent Current
10 pA max Bias Current, Warmed Up (AD648B)
1 �V max Offset Voltage (AD648B)
10 �V/�C max Drift (AD648B)
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, and Plastic SOIC
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 DESCRIPTIONThe 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
voltage of less than 2 mV and an offset voltage drift of less than
20 µV/°C. This level of dc precision is achieved using 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 grades are
offered over the commercial, industrial and military temperature
ranges.
The AD648 is recommended for any dual supply op amp
application requiring low power and excellent dc and ac per-
formance. 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 (82 dB, min on the “B” 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 AD648 and AD648B are rated over the
industrial temperature range of –40°C to +85°C. The AD648S
and AD648T are rated over the military temperature range of
–55°C to +125°C and the AD648T* grade is available pro-
cessed to MIL-STD-883B, Rev. C.
The AD648 is available in an 8-lead plastic mini-DIP,
CERDIP, and SOIC.
*Not for new design, obsolete April 2002.
PRODUCT HIGHLIGHTSA 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.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%.Guaranteed low input offset voltage (2 mV max) and drift
(20 µV/°C max) for the AD648J are achieved using Analog
Devices’ laser drift trimming technology.Analog Devices specifies each device in the warmed-up
condition, insuring that the device will meet its published
specifications in actual use.Matching characteristics are excellent for all grades. The
input offset voltage matching between amplifiers in the
AD648J is within 2 mV.Crosstalk between amplifiers is less than –120 dB at 1 kHz.
CONNECTION DIAGRAM
Plastic Mini-Dip (N) Package,
Plastic SOIC (R) Package
and
CERDIP (Q) Package
AD648–SPECIFICATIONS(@ + 25�C and VS = �15 V dc, unless otherwise noted.)
TEMPERATURE RANGE
NOTESInput Offset Voltage specifications are guaranteed after five minutes of operation at TA = 25°C.Bias Current specifications are guaranteed maximum at either input after five minutes of operation at TA = 25°C. For higher temperature, the current doubles
every 10°C.Matching is defined as the difference between parameters of the two amplifiers.Defined as voltages between inputs, such that neither exceeds ±10 V from ground.
5Not for new design. Obsolete April 2002.
Specifications subject to change without notice.
AD648
SPECIFICATIONS (Continued)
AD648
CAUTIONESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000V 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.
ABSOLUTE MAXIMUM RATINGS1SupplyVoltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .±18V
InternalPowerDissipation2 . . . . . . . . . . . . . . . . . . . .500 mW
Input Voltage3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .±18 V
Output Short Circuit Duration . . . . . . . . . . . . . . . . .Indefinite
DifferentialInputVoltage . . . . . . . . . . . . . . . . . .+VS and –VS
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 . . . . . . . . . . . . . . . . . . . . . . . . . .–40°C to +85°C
AD648S/T . . . . . . . . . . . . . . . . . . . . . . . . .–55°C to +125°C
Lead Temperature Range (Soldering60sec) . . . . . . . . .300°C
NOTES
1Stresses 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.
2Thermal Characteristics:
8-Pin Plastic Package: θJA = 165°C/Watt
8-Pin CERDIP Package: θJC = 22°C/Watt; θJA = 110°C/Watt
8-Pin SOIC Package: θJC = 42°C/Wat; θJA = 160°C/Watt
3For supply voltages less than ±18 V, the absolute maximum input voltage is equal
to the supply voltage.
AD648
