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What is AD549?

This electronic component, produced by the manufacturer "Analog Devices", performs the same function as "Ultralow Input Bias Current Operational Amplifier".


AD549 Datasheet PDF - Analog Devices

Part Number AD549
Description Ultralow Input Bias Current Operational Amplifier
Manufacturers Analog Devices 
Logo Analog Devices Logo 


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FEATURES
Ultralow Bias Current: 60 fA max (AD549L)
250 fA max (AD549J)
Input Bias Current Guaranteed Over Common-Mode
Voltage Range
Low Offset Voltage: 0.25 mV max (AD549K)
1.00 mV max (AD549J)
Low Offset Drift: 5 V/؇C max (AD549K)
20 V/؇C max (AD549J)
Low Power: 700 A max Supply Current
Low Input Voltage Noise: 4 V p-p 0.1 Hz to 10 Hz
MIL-STD-883B Parts Available
APPLICATIONS
Electrometer Amplifiers
Photodiode Preamp
pH Electrode Buffer
Vacuum lon Gage Measurement
Ultralow Input Bias Current
Operational Amplifier
AD549*
CONNECTION DIAGRAM
GUARD PIN, CONNECTED TO CASE
OFFSET NULL
1
NC
8 V+
AD549 7
INVERTING 2
INPUT
6 OUTPUT
3
NONINVERTING
INPUT
5
4 OFFSET
NULL
V–
10k
1
VOS TRIM
NC = NO CONNECTION
5
4 –15V
PRODUCT DESCRIPTION
The AD549 is a monolithic electrometer operational amplifier
with very low input bias current. Input offset voltage and input
offset voltage drift are laser trimmed for precision performance.
The AD549’s ultralow input current is achieved with “Topgate”
JFET technology, a process development exclusive to Analog
Devices. This technology allows the fabrication of extremely low
input current JFETs compatible with a standard junction-
isolated bipolar process. The 1015 common-mode impedance,
a result of the bootstrapped input stage, insures that the input
current is essentially independent of common-mode voltage.
The AD549 is suited for applications requiring very low input
current and low input offset voltage. It excels as a preamp for a
wide variety of current output transducers such as photodiodes,
photomultiplier tubes, or oxygen sensors. The AD549 can also
be used as a precision integrator or low droop sample and hold.
The AD549 is pin compatible with standard FET and electrom-
eter op amps, allowing designers to upgrade the performance of
present systems at little additional cost.
The AD549 is available in a TO-99 hermetic package. The case
is connected to Pin 8 so that the metal case can be independently
connected to a point at the same potential as the input termi-
nals, minimizing stray leakage to the case.
*Protected by Patent No. 4,639,683.
The AD549 is available in four performance grades. The J, K,
and L versions are rated over the commercial temperature range
0°C to +70°C. The S grade is specified over the military tem-
perature range of –55°C to +125°C and is available processed to
MIL-STD-883B, Rev C. Extended reliability PLUS screening is
also available. Plus screening includes 168-hour burn-in, as
well as other environmental and physical tests derived from
MIL-STD-883B, Rev C.
PRODUCT HIGHLIGHTS
1. The AD549’s input currents are specified, 100% tested and
guaranteed after the device is warmed up. Input current is
guaranteed over the entire common-mode input voltage
range.
2. The AD549’s input offset voltage and drift are laser trimmed
to 0.25 mV and 5 µV/°C (AD549K), 1 mV and 20 µV/°C
(AD549J).
3. A maximum quiescent supply current of 700 µA minimizes
heating effects on input current and offset voltage.
4. AC specifications include 1 MHz unity gain bandwidth and
3 V/µs slew rate. Settling time for a 10 V input step is 5 µs to
0.01%.
5. The AD549 is an improved replacement for the AD515,
OPA104, and 3528.
REV. A
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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AD549 equivalent
50
45
40
35
30
25
20
0
5 10 15
POWER SUPPLY VOLTAGE ± V
Figure 10. Input Bias Current
vs. Supply Voltage
20
160
140
120
100
80
60
40
20
10
100 1k
FREQUENCY – Hz
10k
Figure 11. Input Voltage Noise
Spectral Density
AD549
100k
10k
WHENEVER JOHNSON NOISE IS GREATER THAN
AMPLIFIER NOISE, AMPLIFIER NOISE CAN BE
CONSIDERED NEGLIGIBLE FOR THE APPLICATION
1kHz BANDWIDTH
RESISTOR
1k JOHNSON NOISE
100
10
10Hz
BANDWIDTH
1 AMPLIFIER GENERATED NOISE
0.1
100k 1M 10M 100M 1G 10G 100G
SOURCE RESISTANCE –
Figure 12. Noise vs. Source
Resistance
100 100
80 80
60 60
40 40
20 20
00
–20 –20
–40
10 100
1k 10k 100k 1M
FREQUENCY – Hz
Figure 13. Open-Loop
Frequency Response
–40
10M
40
35
30
25
20
15
10
5
0
10 100
1k 10k 100k
FREQUENCY – Hz
Figure 14. Large Signal
Frequency Response
1M
100
80
60
40
20
0
–20
10 100
1k 10k 100k 1M
FREQUENCY – Hz
10M
Figure 15. CMRR vs. Frequency
REV. A
120
100
80
+ SUPPLY
60
40
– SUPPLY
20
0
–20
10 100
1k 10k 100k 1M
FREQUENCY – Hz
10M
Figure 16. PSRR vs. Frequency
10
5 10mV
5mV
1mV
0
10mV
5mV
–5
1mV
–10
0
1 2 34
SETTLING TIME – µs
5
Figure 17. Output Voltage
Swing and Error vs.
Settling Time
–5–


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