Analog Devices AD648 Datasheet
Dual Precision,
a
FEATURES
DC Performance
400 mA max Quiescent Current
10 pA max Bias Current, Warmed Up (AD648C)
300 mV max Offset Voltage (AD648C)
3 mV/8C max Drift (AD648C)
2 mV p-p Noise, 0.1 Hz to 10 Hz
AC Performance
1.8 V/ms 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
The AD648 is a matched pair of low power, precision monolithic 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. 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 application requiring low power and excellent dc and ac performance. 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 configuration 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.
Low Power BiFET Op Amp
AD648
CONNECTION DIAGRAMS
The AD648S and AD648T are rated over the military temperature 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 reduction 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 condition, insuring that the device will meet its published specifications 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.
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.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 617/329-4700 Fax: 617/326-8703
AD648–SPECIFICA TIONS
(@ + 258C and VS = 615 V dc, unless otherwise noted)
Model AD648J/A/S AD648K/B/T AD648C
Min Typ Max Min Typ Max Min Typ Max Units
INPUT OFFSET VOLTAGE
1
Initial Offset 0.75 2.0 0.3 1.0 0.10 0.3 mV
T
to T
MIN
vs. Temperature 20 10 3.0 µV/°C
MAX
3.0/3.0/3.0 1.5/1.5/2.0 0.5 mV
vs. Supply 80 86 86 dB
vs. Supply, T
Long-Term Offset Stability 15 15 15 µV/month
MIN
to T
MAX
76/76/76 80 80 dB
INPUT BIAS CURRENT
Either Input,2 VCM = 0 5 20 3 10 3 10 pA
Either Input2 at T
Max Input Bias Current Over
, VCM = 0 0.45/1.3/20 0.25/0.65/10 0.65 nA
MAX
Common-Mode Voltage Range 30 15 15 pA
Offset Current, VCM = 0 510 2 5 25pA
Offset Current at T
MATCHING CHARACTERISTICS
MAX
3
0.25/0.7/10 0.15/0.35/5 0.35 nA
Input Offset Voltage 1.0 2.0 0.5 1.0 0.2 0.4 mV
Input Offset Voltage T
Input Offset Voltage vs. Temperature 8 5 2.5 µV/°C
MIN
to T
MAX
3.0/3.0/3.0 1.5/1.5/2.0 0.5 mV
Input Bias Current 10 5 5 pA
Crosstalk –120 –120 –120 dB
INPUT IMPEDANCE
Differential 1 × 10
1 2
i3 1 × 1012i31 × 1012i3 ΩipF
Common Mode 3 × 1012i3 3 × 1012i33 × 1012i3 ΩipF
INPUT VOLTAGE RANGE
Differential
4
±20 ±20 ±20 V
Common Mode ±11 ±12 ±11 ±12 ±11 ±12 V
Common-Mode Rejection
VCM = ±10 V 76 82 86 dB
T
to T
MIN
MIN
to T
MAX
MAX
VCM = ±11 V 70 76 76 dB
T
76/76/76 82 86 dB
70/70/70 76 76 dB
INPUT VOLTAGE NOISE
Voltage 0.1 Hz to 10 Hz 2 2 2 4.0 µV p-p
f = 10 Hz 80 80 80 nV/√Hz
f = 100 Hz 40 40 40 nV/√Hz
f = 1 kHz 30 30 30 nV/√Hz
f = 10 kHz 30 30 30 nV/√Hz
INPUT CURRENT NOISE
f = 1 kHz 1.8 1.8 1.8 fA/√Hz
FREQUENCY RESPONSE
Unity Gain, Small Signal 0.8 1.0 0.8 1.0 0.8 1.0 MHz
Full Power Response 30 30 30 kHz
Slew Rate, Unity Gain 1.0 1.8 1.0 1.8 1.0 1.8 V/µs
Settling Time to ±0.01% 8 8 8 µs
OPEN-LOOP GAIN
VO = ±10 V, RL ≥ 10 kΩ 300 1000 300 1000 300 1000 V/mV
T
to T
MIN
VO = ±10 V, RL ≥ 5 kΩ 150 500 150 500 150 500 V/mV
T
MIN
, RL ≥ 10 kΩ 300/300/300 700 300 700 300 700 V/mV
MAX
to T
, RL ≥ 5 kΩ 150/150/150 300 150 300 150 300 V/mV
MAX
OUTPUT CHARACTERISTICS
Voltage @ RL ≥ 10 kΩ,
T
to T
MIN
MIN
to T
MAX
MAX
Voltage @ RL ≥ 5 kΩ,
T
Short Circuit Current 15 15 15 mA
±12/±12/±12 ±13 ±12 ±13 ±12 ±13 V
±11/±11/±11 ±12 ±11 ±12 ±11 ±12 V
POWER SUPPLY
Rated Performance ±15 ± 15 ±15 V
Operating Range ±4.5 ±18 ±4.5 ±18 ± 4.5 ±18 V
Quiescent Current (Both Amplifiers) 340 400 340 400 340 400 µA
TEMPERATURE RANGE
Operating, Rated Performance
Commercial (0°C to +70°C) AD648J AD648K
Industrial (–40°C to +85°C) AD648A AD648B AD648C
Military (–55°C to +125°C) AD648S AD648T
PACKAGE OPTIONS
SOIC (R-8) AD648JR AD648KR
Plastic (N-8) AD648JN AD648KN
Cerdip (Q-8) AD648AQ, AD648SQ, AD648SQ/883B AD648BQ, AD648TQ/883B AD648CQ
Metal Can (H-08A) AD648AH AD648BH, AD648TH/883B
Tape and Reel AD648JR-REEL, AD648JR-REEL7 AD648KR-REEL, AD648KR-REEL7
Chips Available AD648JChips, AD648SChips
–2–
REV. C
WARNING!
ESD SENSITIVE DEVICE
NOTES
1
Input Offset Voltage specifications are guaranteed after 5 minutes of operation at TA = +25°C.
2
Bias Current specifications are guaranteed maximum at either input after 5 minutes of operation at T
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.
= +25°C. For higher temperature, the current doubles
A
AD648
ABSOLUTE MAXIMUM RATINGS
Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±18 V
Internal Power Dissipation
Input Voltage
3
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±18 V
2
. . . . . . . . . . . . . . . . . . . .500 mW
1
Output Short Circuit Duration . . . . . . . . . . . . . . . . . Indefinite
Differential Input Voltage . . . . . . . . . . . . . . . . . . +V
and –V
S
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: θJA = 165°C/Watt
8-Pin Cerdip Package: θJC = 22°C/Watt; θJA = 110°C/Watt
8-Pin Metal Package: θJC = 65°C/Watt; θJA = 150°C/Watt
8-Pin SOIC Package: θJC = 42°C/Wat; θJA = 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.
REV. C
–3–
AD648—Typical Characteristics
–4–
REV. C
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