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Analog Devices Semiconductor Electronic Components Datasheet

AD642 Datasheet

Precision/ Low Cost Dual BiFET Op Amp

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AD642 pdf
a
FEATURES
Matched Offset Voltage
Matched Offset Voltage Over Temperature
Matched Bias Current
Crosstalk: –124 dB @ 1 kHz
Low Bias Current: 35 pA max Warmed Up
Low Offset Voltage: 500 V max
Low Input Voltage Noise: 2 V p-p
High Open Loop Gain
Low Quiescent Current: 2.8 mA max
Low Total Harmonic Distortion
Standard Dual Amplifier Pin Out
Available in Hermetic Metal Can Package and Chip Form
MIL-STD-883B Processing Available
Single Version Available: AD542
Precision, Low Cost
Dual BiFET Op Amp
AD642
PIN CONFIGURATION
PRODUCT DESCRIPTION
The AD642 is a pair of matched high speed monolithic BiFET
operational amplifier fabricated with the most advanced bipolar,
JFET and laser trimming technologies. The AD642 offers
matched bias currents that are significantly lower than currently
available monolithic dual FET input operational amplifiers:
35 pA max matched to 25 pA for the AD642K and L; 75 pA
max, matched to 35 pA for the AD642J and S. In addition, the
offset voltage is laser trimmed to less than 0.5 mV and matched
to 0.25 mV for the AD642L, 1.0 mV and matched to 0.5 mV for
the AD642K, utilizing Analog’s laser-wafer trimming (LWT)
process.
The tight matching and temperature tracking between the
operational amplifiers is achieved by ion-implanted JFETs and
laser-wafer trimming. Ion-implantation permits the fabrication of
precision, matched JFETs on a monolithic bipolar chip. The
optimizes the process to product matched bias currents which
have lower initial bias currents than other popular BiFET op
amps. Laser-wafer trimming each amplifier’s input offset voltage
assures tight initial match and combined with superior IC
processing guarantees offset voltage tracking over the tempera-
ture range.
The AD642 is recommended for applications in which excellent
ac and dc performance is required. The matched amplifiers
provide a low-cost solution for true instrumentation amplifiers,
log ratio amplifiers, and output amplifiers for four quadrant
multiplying D/A converters such as the AD7541.
The AD642 is available in four versions: the ‘‘J’’, ‘‘K’’ and ‘‘L,’’
all specified over the 0°C to +70°C temperature range and one
version, ‘‘S,’’ over the –55°C to +125°C extended operating
temperature range. All devices are packaged in the hermetically-
sealed, TO-99 metal can or available in chip form.
PRODUCT HIGHLIGHTS
1. The AD642 has tight matching specifications to ensure high
performance, eliminating the need to match individual
devices.
2. Analog Devices, unlike some manufacturers, specifies each
device for the maximum bias current at either input in the
warmed-up condition, thus assuring the user that the AD642
will meet its published specifications in actual use.
3. Laser-wafer-trimming reduces offset voltage to as low as
0.5 mV max and matched side to side to 0.25 mV
(AD642L), thus eliminating the need for external nulling.
4. Low voltage noise (2 µV, p-p), and high open loop gain
enhance the AD642’s performance as a precision op amp.
5. The standard dual amplifier pin out allows the AD642 to
replace lower performance duals without redesign.
6. The AD642 is available in chip form.
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.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 617/329-4700
Fax: 617/326-8703


Analog Devices Semiconductor Electronic Components Datasheet

AD642 Datasheet

Precision/ Low Cost Dual BiFET Op Amp

No Preview Available !

AD642 pdf
AD642–SPECIFICATIONS (@ + 25°C, and VS = ±15 V dc)
Model
AD642J
AD642K
Min Typ
Max Min Typ Max
AD642L
AD642S
Min Typ Max Min Typ Max Unit
OPEN LOOP GAIN
VO = ± 10 V, RL 2 k
TMIN to TMAX, RL = 2 k
OUTPUT CHARACTERISTICS
Voltage @ RL = 2 k, TMIN to TMAX
Voltage @ RL = 10 k, TMIN to TMAX
Short Circuit Current
100,000
100,000
±10 ± 12
±12 ± 13
25
250,000
250,000
±10 ± 12
±12 ± 13
25
250,000
250,000
±10 ± 12
±12 ± 13
25
250,000
100,000
±10 ± 12
±12 ± 13
25
V/V
V/V
V
V
mA
FREQUENCY RESPONSE
Unity Gain Small Signal
Full Power Response
Slew Rate, Unity Gain
INPUT OFFSET VOLTAGE1
Initial Offset
Input Offset Voltage TMIN to TMAX
Input Offset Voltage vs. Supply,
TMIN to TMAX
INPUT BIAS CURRENT2
Either Input
Offset Current
1.0
50
2.0 3.0
10
5
1.0
50
2.0 3.0
2.0 1.0
3.5 2.0
200 100
75 10 35
2
1.0
50
2.0 3.0
1.0
50
2.0 3.0
MHz
kHz
V/µs
0.5 1.0 mV
1.0 3.5 mV
100 100 µV/V
10 35
2
10 35 pA
2
MATCHING CHARACTERISTICS3
Input Offset Voltage
Input Offset Voltage TMIN to TMAX
Input Bias Current
Crosstalk
–124
1.0
3.5
35
–124
0.5
2.0
25
–124
0.25
1.0
25
0.5 mV
3.5 mV
35 pA
–124
dB
INPUT IMPEDANCE
Differential
Common Mode
1012ʈ6
1012ʈ6
1012ʈ6
1012ʈ6
1012ʈ6
1012ʈ6
1012ʈ6
1012ʈ6
MʈpF
MʈpF
INPUT VOLTAGE RANGE
Differential4
Common Mode
Common-Mode Rejection
± 20
±10 ± 12
76
± 20
±10 ± 12
80
± 20
±10 ± 12
80
± 20
±10 ± 12
80
V
V
dB
INPUT NOISE
Voltage 0.1 Hz to 10 Hz
2
2
f = 10 Hz
70 70
f = 100 Hz
45 45
f = 1 kHz
30 30
f = 10 kHz
25 25
2 2 µV p-p
70 70 nV/Hz
45 45 nV/Hz
30 30 nV/Hz
25 25 nV/Hz
POWER SUPPLY
Rated Performance
Operating
Quiescent Current
± 15 ± 15
±5
± 18 ± 5
± 15
2.8 2.8
± 15 ± 15 V
± 5 ± 15 ± 5 ± 15 V
2.8 2.8 mA
TRANSISTOR COUNT
58 58
58 58
PACKAGE OPTION
TO-99 Style (H-08B)
AD642JH
AD642KH
AD642LH
AD642SH
NOTES
1Input Offset Voltage specifications are guaranteed after 5 minutes of operation at T A = +25°C.
2Bias Current specifications are guaranteed at maximum at either input after 5 minutes of operation at T A = +25°C. For higher temperatures, the current doublers
every 10°C.
3Matching is defined as ther difference between parameters of the two amplifiers.
4Defined as the maximum safe voltage between inputs, such that neither exceeds ± 10 V from ground.
Specifications subject to change without notice.
Specifications shown in boldface are tested on all production units at final electrical test. Results from those tests are used to calculate outgoing quality levels. All min
and max specifications are guaranteed, although only those shown in boldface are tested on all production units.
OUTLINE DIMENSIONS
Dimensions shown in inches and (mm).
TO-99
METALIZATION PHOTOGRAPHIC
Contact factory for latest dimensions.
Dimensions shown in inches and (mm).
0.185 (4.70)
0.165 (4.19)
0.050
(1.27)
MAX
REFERENCE PLANE
0.750 (19.05)
0.500 (12.70)
0.250 (6.35)
MIN
0.100
(2.54)
BSC
5
0.160 (4.06)
0.110 (2.79)
0.335 (8.51)
0.305 (7.75)
0.370 (9.40)
0.335 (8.51)
0.200
(5.08)
BSC
4
3
2
6
0.045 (1.14)
7 0.027 (0.69)
8
0.040 (1.02) MAX
0.045 (1.14)
0.010 (0.25)
0.019 (0.48)
0.016 (0.41)
0.100
(2.54)
BSC
0.021 (0.53)
0.016 (0.41)
BASE & SEATING PLANE
1
0.034 (0.86)
0.027 (0.69)
45°
BSC
–2–
REV. 0


Part Number AD642
Description Precision/ Low Cost Dual BiFET Op Amp
Maker Analog Devices
Total Page 6 Pages
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