AD548AH Analog Devices Inc, AD548AH Datasheet

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AD548AH

Manufacturer Part Number
AD548AH
Description
Manufacturer
Analog Devices Inc
Datasheet
a
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.
PRODUCT DESCRIPTION
The AD548 is a low power, precision monolithic operational
amplifier. It offers both low bias current (10 pA max, warmed
up) and low quiescent current (200 A max) and is fabricated
with ion-implanted FET and laser wafer trimming technologies.
Input bias current is guaranteed over the AD548’s entire
common-mode voltage range.
The economical J grade has a maximum guaranteed input offset
voltage of less than 2 mV and an input offset voltage drift of less
than 20 V/ C. The C grade reduces input offset voltage to less
than 0.25 mV and offset voltage drift to less than 2 V/ C. This
level of dc precision is achieved utilizing Analog’s laser wafer
drift trimming process. The combination of low quiescent cur-
rent and low offset voltage drift minimizes changes in input off-
set voltage due to self-heating effects. Four additional grades are
offered over the commercial, industrial and military temperature
ranges.
The AD548 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 AD548’s
excellent combination of low input offset voltage and drift, low
bias current and low 1/f noise reduces output errors. High com-
mon-mode rejection (86 dB, min on the “C” grade) and high
open-loop gain ensures better than 12-bit linearity in high im-
pedance, buffer applications.
The AD548 is pinned out in a standard op amp configuration
and is available in six performance grades. The AD548J and
AD548K are rated over the commercial temperature range of
0 C to +70 C. The AD548A, AD548B and AD548C are rated
FEATURES
Enhanced Replacement for LF441 and TL061
DC Performance:
AC Performance:
Available in Plastic, Hermetic Cerdip and Hermetic
Available in Tape and Reel in Accordance with
MIL-STD-883B Parts Available
Dual Version Available: AD648
Surface Mount (SOIC) Package Available
200 A max Quiescent Current
10 pA max Bias Current, Warmed Up (AD548C)
250 V max Offset Voltage (AD548C)
2 V/ C max Drift (AD548C)
2 V p-p Noise, 0.1 Hz to 10 Hz
1.8 V/ s Slew Rate
1 MHz Unity Gain Bandwidth
Metal Can Packages and in Chip Form
EIA-481A Standard
over the industrial temperature range of –40 C to +85 C. The
AD548S is rated over the military temperature range of –55 C
to +125 C and is available processed to MIL-STD-883B, Rev. C.
The AD548 is available in an 8-pin plastic mini-DIP, cerdip,
TO-99 metal can, surface mount (SOIC), or in chip form.
PRODUCT HIGHLIGHTS
1. A combination of low supply current, excellent dc and ac
2. The AD548 is pin compatible with industry standard op
3. Guaranteed low input offset voltage (2 mV max) and drift
4. Analog Devices specifies each device in the warmed-up con-
5. A dual version, the AD648 is also available.
6. Enhanced replacement for LF441 and TL061.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 617/329-4700
NONINVERTING
OFFSET NULL
performance and low drift makes the AD548 the ideal op
amp for high performance, low power applications.
amps such as the LF441, TL061, and AD542, enabling de-
signers to improve performance while achieving a reduction
in power dissipation of up to 85%.
(20 V/ C max) for the AD548J are achieved utilizing
Analog Devices’ laser drift trimming technology, eliminating
the need for external trimming.
dition, insuring that the device will meet its published specifi-
cations in actual use.
NONINVERTING
OFFSET NULL
INVERTING
INVERTING
NOTE : PIN 4 CONNECTED TO CASE
NC = NO CONNECT
INPUT
INPUT
INPUT
INPUT
V–
TO-99 (H) Package
2
Plastic Mini-DIP (N) Package,
1
3
4
2
1
CONNECTION DIAGRAMS
3
TOP VIEW
Cerdip (Q) Package and
AD548
AD548
Precision, Low Power
NC
4
V–
8
SOIC (R)Package
7
5
8
7
6
5
V+
6
OFFSET
NULL
NC
V+
OUTPUT
OFFSET
NULL
OUTPUT
BiFET Op Amp
1
V
TOP VIEW
AD548
10k
OS
Fax: 617/326-8703
TRIM
5
4
–15V

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AD548AH Summary of contents

Page 1

... AD548K are rated over the commercial temperature range +70 C. The AD548A, AD548B and AD548C are rated 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 ...

Page 2

... Military (– +125 C) PACKAGE OPTIONS SOIC (R-8) AD548JR Plastic (N-8) AD548JN Cerdip (Q-8) AD548AQ Metal Can (H-08A) AD548AH Tape and Reel AD548JR-REEL Chips Available AD548JCHIPS NOTES 1 Input Offset Voltage specifications are guaranteed after 5 minutes of operation Bias Current specifications are guaranteed maximum at either input after 5 minutes of operation Defined as voltages between inputs, such that neither exceeds 10 V from ground ...

Page 3

ABSOLUTE MAXIMUM RATINGS Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 ...

Page 4

AD548–Typical Characteristics –10 –6 – COMMON-MODE VOLTAGE – V Figure 7. Input Bias Current vs. Common-Mode Voltage 100 100 PHASE GAIN ...

Page 5

Figure 19a. Unity Gain Follower Figure 20a. Utility Gain Inverter APPLICATION NOTES The AD548 is a JFET-input op amp with a guaranteed maxi- mum I of less than 10 pA, and offset and drift laser-trimmed to B 0.25 mV and ...

Page 6

AD548 Figure 22. Board Layout for Guarding Inputs INPUT PROTECTION The AD548 is guaranteed to withstand input voltages equal to the power supply potential. Exceeding the negative supply volt- age on either input will forward bias the substrate junction of ...

Page 7

PHOTODIODE PREAMP The performance of the photodiode preamp shown in Figure 27 is enhanced by the AD548’s low input current, input voltage offset and offset voltage drift. The photodiode sources a current proportional to the incident light power on its ...

Page 8

AD548 Figure 30. Log Ratio Amplifier compensation is provided by resistors R8 and R15, which have a positive 3500 ppm/ C temperature coefficient. The transfer function for the output voltage is log (I OUT 10 2 Frequency compensation ...

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