a
FEATURES
Ultralow Drift: 1 V/ C (AD547L)
Low Offset Voltage: 0.25 mV (AD547L)
Low Input Bias Currents: 25 pA max
Low Quiescent Current: 1.5 mA
Low Noise: 2 V p-p
High Open Loop Gain: 110 dB
High Slew Rate: 13 V/ s
Fast Settling to 0.01%: 3 s
Low Total Harmonic Distortion: 0.0025%
Available in Hermetic Metal Can and Die Form
MIL-STD-883B Versions Available
Dual Versions Available: AD642, AD644, AD647
High Performance,
BiFET Operational Amplifiers
AD542/AD544/AD547
CONNECTION DIAGRAM
TAB
8
NULL
1
2
3
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7
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5
+V
INVERTING
INPUT
NONINVERTING
INPUT
OUTPUT
NULL
鈥揤
NOTE: PIN 4 CONNECTED TO CASE
PRODUCT DESCRIPTION
PRODUCT HIGHLIGHTS
The BiFET series of precision, monolithic FET-input op amps
are fabricated with the most advanced BiFET and laser trim-
ming technologies. The AD542, AD544, AD547 series offers
bias currents significantly lower than currently available BiFET
devices, 25 pA max, warmed up.
In addition, the offset voltage is laser trimmed to less than
0.25 mV on the AD547L, which is achieved by utilizing Analog
Devices鈥?exclusive laser wafer trimming (LWT) process. When
combined with the AD547鈥檚 low offset drift (1
碌V/擄C),
these
features offer the user performance superior to existing BiFET
op amps at low BiFET pricing.
The AD542 or AD547 is recommended for any operational am-
plifier application requiring excellent dc performance at low to
moderate cost. Precision instrument front ends requiring accu-
rate amplification of millivolt level signals from megohm source
impedances will benefit from the device鈥檚 excellent combination
of low offset voltage and drift, low bias current and low 1/f
noise. High common-mode rejection (80 dB, min on the 鈥淜鈥?/div>
and 鈥淟鈥?grades) and high open-loop gain, even under heavy
loading, ensures better than 鈥?2-bit鈥?linearity in high imped-
ance buffer applications.
The AD544 is recommended for any op amp applications re-
quiring excellent ac and dc performance at low cost. The
2 MHz bandwidth and low offset of the AD544 make it the first
choice as an output amplifier for current output D/A converters,
such as the AD7541, 12-bit CMOS DAC.
Devices in this series are available in four grades: the 鈥淛,鈥?鈥淜,鈥?/div>
and 鈥淟鈥?grades are specified over the 0擄C to +70擄C temperature
range and the 鈥淪鈥?grade over the 鈥?5擄C to +125擄C operating
temperature range. All devices are offered in the hermetically
sealed, TO-99 metal can package.
1. Improved bipolar and JFET processing results in the lowest
bias current available in a monolithic FET op amp.
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 device
will meet its published specifications in actual use.
3. Advanced laser wafer trimming techniques reduce offset volt-
age drift to 1
碌V/擄C
max and offset voltage to only 0.25 mV
max on the AD547L.
4. Low voltage noise (2
碌V
p-p) and low offset voltage drift en-
hance performance as a precision op amp.
5. High slew rate (13 V/碌s) and fast settling time to 0.01% (3
碌s)
make the AD544 ideal for D/A, A/D, sample-hold circuits
and high speed integrators.
6. Low harmonic distortion (0.0025%) make the AD544 an
ideal choice in audio applications.
7. Bare die are available for use in hybrid circuit applications.
REV. B
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
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