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AD645

Low Noise/ Low Drift FET Op Amp


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AD645 pdf
a
Low Noise, Low Drift
FET Op Amp
AD645
FEATURES
Improved Replacement for Burr-Brown
OPA-111 and OPA-121 Op Amp
LOW NOISE
2 V p-p max, 0.1 Hz to 10 Hz
10 nV/Hz max at 10 kHz
11 fA p-p Current Noise 0.1
HIGH DC ACCURACY
250 V max Offset Voltage
Hz
to
10
HIMz PRDORVIEFDT
1 V/؇C max Drift
1.5 pA max Input Bias Current
114 dB Open-Loop Gain
Available in Plastic Mini-DIP, 8-Pin Header Packages, or
Chip Form
APPLICATIONS
Low Noise Photodiode Preamps
CT Scanners
Precision I-V Converters
PRODUCT DESCRIPTION
The AD645 is a low noise, precision FET input op amp. It of-
fers the pico amp level input currents of a FET input device
coupled with offset drift and input voltage noise comparable to a
high performance bipolar input amplifier.
The AD645 has been improved to offer the lowest offset drift in
a FET op amp, 1 µV/°C. Offset voltage drift is measured and
trimmed at wafer level for the lowest cost possible. An inher-
ently low noise architecture and advanced manufacturing tech-
niques result in a device with a guaranteed low input voltage
noise of 2 µV p-p, 0.1 Hz to 10 Hz. This level of dc performance
along with low input currents make the AD645 an excellent
choice for high impedance applications where stability is of
prime concern.
1k
100
10
1.0
1 10 100 1k 10k
FREQUENCY – Hz
Figure 1. AD645 Voltage Noise Spectral Density vs.
Frequency
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.
CONNECTION DIAGRAMS
8-Pin Plastic Mini-DIP
(N) Package
TO-99 (H) Package
CASE
OFFSET 1
NULL
–IN 2
AD645
8 NC
7 +VS
+IN 3
6 OUTPUT
–VS
4
TOP VIEW
5 OFFSET
NULL
NC = NO CONNECT
OFFSET
NULL 1
8
+V
7
– IN 2
6 OUTPUT
3 AD645 5
+IN 4 OFFSET
NULL
–V
NOTE: CASE IS CONNECTED
TO PIN 8
The AD645 is available in six performance grades. The AD645J
and AD645K are rated over the commercial temperature range
of 0°C to +70°C. The AD645A, AD645B, and the ultra-
precision AD645C are rated over the industrial temperature
range of –40°C to +85°C. The AD645S is rated over the military
temperature range of –55°C to +125°C and is available
processed to MIL-STD-883B.
The AD645 is available in an 8-pin plastic mini-DIP, 8-pin
header, or in die form.
PRODUCT HIGHLIGHTS
1. Guaranteed and tested low frequency noise of 2 µV p-p max
and 20 nV/Hz at 100 Hz makes the AD645C ideal for low
noise applications where a FET input op amp is needed.
2. Low VOS drift of 1 µV/°C max makes the AD645C an excel-
lent choice for applications requiring ultimate stability.
3. Low input bias current and current noise (11 fA p-p 0.1 Hz to
10 Hz) allow the AD645 to be used as a high precision
preamp for current output sensors such as photodiodes, or as
a buffer for high source impedance voltage output sensors.
30
25
20
15
10
5
0
–2.5 –2.0 –1.5 –1.0 –0.5 0.0 0.5 1.0 1.5 2.0 2.5
INPUT OFFSET VOLTAGE DRIFT– µV/°C
Figure 2. Typical Distribution of Average Input Offset
Voltage Drift (196 Units)
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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AD645 pdf
AD645–SPECIFICATIONS(@ +25؇C, and ؎15 V dc, unless otherwise noted)
Model
Conditions1
AD645J/A
AD645K/B
AD645C
Min Typ Max Min Typ Max Min Typ Max
AD645S
Min Typ Max Units
INPUT OFFSET VOLTAGE1
Initial Offset
Offset
Drift (Average)
vs. Supply (PSRR)
vs. Supply
INPUT BIAS CURRENT2
Either Input
Either Input
@ TMAX
Either Input
Offset Current
Offset Current
@ TMAX
INPUT VOLTAGE NOISE
TMIN –TMAX
TMIN –TMAX
VCM = 0 V
VCM = 0 V
VCM = +10 V
VCM = 0 V
VCM = 0 V
0.1 to 10 Hz
f = 10 Hz
f = 100 Hz
f = 1 kHz
f = 10 kHz
100
300
3
90 110
100
500 50 250
50 250
1000
100 400
75 300
10/5 1 5/2
0.5 1
94 110
94 110
90 100
90 100
100 500 µV
500 1500 µV
4 10 µV/°C
90 110
dB
86 95
dB
0.7/1.8 3/5
16/115
0.8/1.9
0.1 1.0
2/6
1.0 3.0
20 50
10 30
9 15
8 10
0.7/1.8 1.5/3
16/115
0.8/1.9
0.1 0.5
2/6
1.0 2.5
20 40
10 20
9 12
8 10
1.8 3
115
1.9
0.1 0.5
6
12
20 40
10 20
9 12
8 10
1.8 5
1800
1.9
0.1 1.0
100
1.0 3.3
20 50
10 30
9 15
8 10
pA
pA
pA
pA
pA
µV p-p
nV/Hz
nV/Hz
nV/Hz
nV/Hz
INPUT CURRENT NOISE
f = 0.1 to 10 Hz
f = 0.1 thru 20 kHz
11 20
0.6 1.1
11 15
0.6 0.8
11 15
0.6 0.8
11 20
0.6 1.1
fA p-p
fA/Hz
FREQUENCY RESPONSE
Unity Gain, Small Signal
Full Power Response
Slew Rate, Unity Gain
SETTLING TIME3
To 0.1%
To 0.01%
Overload Recovery4
Total Harmonic
Distortion
INPUT IMPEDANCE
Differential
Common-Mode
VO = 20 V p-p
RLOAD = 2 k
VOUT = 20 V p-p
RLOAD = 2 k
50% Overdrive
f = 1 kHz
RLOAD 2 k
VO = 3 V rms
VDIFF = ± 1 V
2
16 32
12
6
8
5
0.0006
1012ʈ1
1014ʈ2.2
2
16 32
12
6
8
5
0.0006
1012ʈ1
1014ʈ2.2
2
16 32
12
6
8
5
0.0006
1012ʈ1
1014ʈ2.2
2
16 32
12
6
8
5
0.0006
1012ʈ1
1014ʈ2.2
MHz
kHz
V/µs
µs
µs
µs
%
ʈpF
ʈpF
INPUT VOLTAGE RANGE
Differential5
Common-Mode Voltage
Over Max Oper. Range
Common-Mode
Rejection Ratio
VCM = ± 10 V
TMIN–TMAX
OPEN-LOOP GAIN
VO = ± 10 V
RLOAD 2 k
TMIN –TMAX
OUTPUT CHARACTERISTICS
Voltage
Current
RLOAD 2 k
TMIN –TMAX
VOUT = ± 10 V
Short Circuit
± 20
± 10 +11, –10.4
± 10
90 110
100
114 130
± 10 ± 11
± 10
± 5 ± 10
± 15
± 20
± 10 +11, –10.4
± 10
94 110
90 100
± 20
± 10 +11, –10.4
± 10
94 110
90 100
120 130
114
120 130
114
± 10 ± 11
± 10
± 5 ± 10
± 15
± 10 ± 11
± 10
± 5 ± 10
± 15
± 20
± 10 +11, –10.4
± 10
90 110
86 100
V
V
V
dB
dB
114 130
110
dB
dB
± 10 ± 11
± 10
± 5 ± 10
± 15
V
V
mA
mA
POWER SUPPLY
Rated Performance
Operating Range
Quiescent Current
Transistor Count
# of Transistors
± 15
±5
3.0
62
± 15 ± 15
± 18 ± 5
± 18 ± 5
± 18
3.5 3.0 3.5
3.0 3.5
62 62
± 15 V
± 5 ± 18 V
3.0 3.5 mA
62
NOTES
1Input offset voltage specifications are guaranteed after 5 minutes of operation at T A = +25°C.
2Bias current specifications are guaranteed maximum at either input after 5 minutes of operation at TA = +25°C. For higher temperature, the current doubles every 10°C.
3Gain = –1, RLOAD = 2 k.
4Defined as the time required for the amplifier’s output to return to normal operation after removal of a 50% overload from the amplifier input.
5Defined as the maximum continuous voltage between the inputs such that neither input exceeds ± 10 V from ground.
All min and max specifications are guaranteed.
Specifications subject to change without notice.
–2– REV. B



Part Number AD645
Description Low Noise/ Low Drift FET Op Amp
Maker Analog Devices - Analog Devices
Total Page 8 Pages
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