Analog Devices AD743 Datasheet
Ultralow Noise
100
1k
10k 100k
1
10
100
1000
1M
10M
SOURCE RESISTANCE – Ω
OP27 &
RESISTOR
AD743 + RESISTOR
RESISTOR NOISE ONLY
AD743 & RESISTOR
OR
OP27 & RESISTOR
R
SOURCE
R
SOURCE
O
E
INPUT NOISE VOLTAGE – nV/ Hz
(
)
(– – –)
( — )
AD743
8
TOP VIEW
1
2
3
7
6
8
5
4
OUT
NULL
NC
+V
S
NULL
–IN
+IN
–V
S
NC = NO CONNECT
OFFSET
NULL
AD743
–IN
+IN
8
1
2
3
4
9
10
11
12
13
14
16 NC
NC
NC
OUTPUT
+V
S
–V
S
NC
NC
15
8
7
6
5
NC
OFFSET
NULL
NC
NC
NC
NC = NO CONNECT
a
FEATURES
ULTRALOW NOISE PERFORMANCE
2.9 nV/√Hz at 10 kHz
0.38 mV p-p, 0.1 Hz to 10 Hz
6.9 fA/√
EXCELLENT DC PERFORMANCE
0.5 mV max Offset Voltage
250 pA max Input Bias Current
1000 V/mV min Open-Loop Gain
AC PERFORMANCE
2.8 V/ms Slew Rate
4.5 MHz Unity-Gain Bandwidth
THD = 0.0003% @ 1 kHz
Available in Tape and Reel in Accordance with
APPLICATIONS
Sonar Preamplifiers
High Dynamic Range Filters (>140 dB)
Photodiode and IR Detector Amplifiers
Accelerometers
PRODUCT DESCRIPTION
The AD743 is an ultralow noise precision, FET input,
monolithic operational amplifier. It offers a combination of the
ultralow voltage noise generally associated with bipolar input op
amps and the very low input current of a FET-input device.
Furthermore, the AD743 does not exhibit an output phase
reversal when the negative common-mode voltage limit is
exceeded.
The AD743’s guaranteed, maximum input voltage noise of
4.0 nV/√
monolithic op amp, as is the maximum 1.0 µV p-p, 0.1 Hz to
10 Hz noise. The AD743 also has excellent dc performance with
250 pA maximum input bias current and 0.5 mV maximum
offset voltage.
The AD743 is specifically designed for use as a preamp in
capacitive sensors, such as ceramic hydrophones. It is available
in five performance grades. The AD743J and AD743K are rated
over the commercial temperature range of 0°C to +70°C. The
AD743A and AD743B are rated over the industrial temperature
range of –40°C to +85°C. The AD743S is rated over the
military temperature range of –55°C to +125°C and is available
processed to MIL-STD-883B, Rev. C.
The AD743 is available in 8-pin plastic mini-DIP, 8-pin cerdip,
16-pin SOIC, or in chip form.
REV. C
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.
Hz Current Noise at 1 kHz
EIA-481A Standard
Hz at 10 kHz is unsurpassed for a FET-input
BiFET Op Amp
AD743
CONNECTION DIAGRAMS
8-Pin Plastic Mini-DIP (N)
and
8-Pin Cerdip (Q) Packages
PRODUCT HIGHLIGHTS
1. The low offset voltage and low input offset voltage drift of
the AD743 coupled with its ultralow noise performance
mean that the AD743 can be used for upgrading many
applications now using bipolar amplifiers.
2. The combination of low voltage and low current noise make
the AD743 ideal for charge sensitive applications such as
accelerometers and hydrophones.
3. The low input offset voltage and low noise level of the
AD743 provide >140 dB dynamic range.
4. The typical 10 kHz noise level of 2.9 nV/√
op amp instrumentation amplifier, using three AD743s, to be
built which exhibits less than 4.2 nV/√
and which has low input bias currents.
Input Noise Voltage vs. Source Resistance
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 617/329-4700 Fax: 617/326-8703
16-Pin SOIC (R) Package
Hz permits a three
Hz noise at 10 kHz
AD743–SPECIFICATIONS
(@ +258C and 615 V dc, unless otherwise noted)
Model Conditions Min Typ Max Min Typ Max Min Typ Max Units
AD743J AD743K/B AD743S
INPUT OFFSET VOLTAGE
1
Initial Offset 0.25 1.0/0.8 0.1 0.5/0.25 0.25 1.0 mV
Initial Offset T
vs. Temp. T
MIN
MIN
to T
to T
MAX
MAX
212µV/°C
1.5 1.0/0.50 2.0 mV
vs. Supply (PSRR) 12 V to 18 V290 96 100 106 90 96 dB
vs. Supply (PSRR) T
INPUT BIAS CURRENT
3
MIN
to T
88 98 100 88 dB
MAX
Either Input VCM = 0 V 150 400 150 250 150 400 pA
Either Input
@ T
MAX
VCM = 0 V 8.8/25.6 5.5/16 413 nA
Either Input VCM = +10 V 250 600 250 400 300 600 pA
Either Input, VS = ±5 V VCM = 0 V 30 200 30 125 30 200 pA
INPUT OFFSET CURRENT VCM = 0 V 40 150 30 75 40 150 pA
Offset Current
@ T
MAX
VCM = 0 V 2.2/6.4 1.1/3.2 102 nA
FREQUENCY RESPONSE
Gain BW, Small Signal G = –1 4.5 4.5 4.5 MHz
Full Power Response VO = 20 V p-p 25 25 25 kHz
Slew Rate, Unity Gain G = –1 2.8 2.8 2.8 V/µs
Settling Time to 0.01% 6 6 6 µs
Total Harmonic f = 1 kHz
Distortion4 (Figure 16) G = –1 0.0003 0.0003 0.0003 %
INPUT IMPEDANCE
Differential 1 3 1010||20 1 3 1010||20 1 3 1010||20 Ω||pF
Common Mode 3 3 1011||18 3 3 1011||18 3 3 1011||18 Ω||pF
INPUT VOLTAGE RANGE
Differential
Common-Mode Voltage +13.3, –10.7 +13.3, –10.7 +13.3, –10.7 V
Over Max Operating Range
5
6
–10 +12 –10 +12 –10 +12 V
±20 ±20 ±20 V
Common-Mode
Rejection Ratio VCM = ±10 V 80 95 90 102 80 95 dB
T
MIN
to T
78 88 78 dB
MAX
INPUT VOLTAGE NOISE 0.1 Hz to 10 Hz 0.38 0.38 1.0 0.38 µV p-p
f = 10 Hz 5.5 5.5 10.0 5.5 nV/√Hz
f = 100 Hz 3.6 3.6 6.0 3.6 nV/√Hz
f = 1 kHz 3.2 5.0 3.2 5.0 3.2 5.0 nV/√Hz
f = 10 kHz 2.9 4.0 2.9 4.0 2.9 4.0 nV/√Hz
INPUT CURRENT NOISE f = 1 kHz 6.9 6.9 6.9 fA/√Hz
OPEN LOOP GAIN VO = ±10 V
R
≥ 2 kΩ 1000 4000 2000 4000 1000 4000 V/mV
LOAD
T
to T
MIN
R
= 600 Ω 1200 1200 1200 V/mV
LOAD
800 1800 800 V/mV
MAX
OUTPUT CHARACTERISTICS
Voltage R
≥ 600 Ω +13, –12 +13, –12 +13, –12 V
LOAD
R
≥ 600 Ω +13.6, –12.6 +13.6, –12.6 +13.6, –12.6 V
LOAD
T
to T
MIN
R
≥ 2 kΩ±12 +13.8, –13.1 ± 12 +13.8, –13.1 ± 12 +13.8, –13.1 V
LOAD
+12, –10 +12, –10 +12, –10 V
MAX
Current Short Circuit 20 40 20 40 20 40 mA
POWER SUPPLY
Rated Performance ± 15 ±15 ±15 V
Operating Range ± 4.8 ±18 ±4.8 ±18 ±4.8 ±18 V
Quiescent Current 8.1 10.0 8.1 10.0 8.1 10.0 mA
TRANSISTOR COUNT # of Transistors 50 50 50
NOTES
1
Input offset voltage specifications are guaranteed after 5 minutes of operation at TA = +25°C.
2
Test conditions: +VS = 15 V, –VS = 12 V to 18 V and +VS = 12 V to +18 V, –VS = 15 V.
3
Bias 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.
4
Gain = –1, RL = 2 kΩ, CL = 10 pF.
5
Defined as voltage between inputs, such that neither exceeds ±10 V from common.
6
Thc AD743 does not exhibit an output phase reversal when the negative common-mode limit is exceeded.
All min and max specifications are guaranteed.
Specifications subject to change without notice.
–2–
REV. C
AD743
ABSOLUTE MAXIMUM RATINGS
Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±18 V
Internal Power Dissipation
2
Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±V
1
S
Output Short Circuit Duration . . . . . . . . . . . . . . . . . Indefinite
Differential Input Voltage . . . . . . . . . . . . . . . . . . +V
and –V
S
S
Storage Temperature Range (Q) . . . . . . . . . .–65°C to +150°C
Storage Temperature Range (N, R) . . . . . . . .–65°C to +125°C
Operating Temperature Range
AD743J/K . . . . . . . . . . . . . . . . . . . . . . . . . . . 0°C to +70°C
AD743A/B . . . . . . . . . . . . . . . . . . . . . . . . . .–40°C to +85°C
AD743S . . . . . . . . . . . . . . . . . . . . . . . . . . .–55°C to +125°C
Lead Temperature Range (Soldering 60 seconds) . . . . . 300°C
NOTES
1
Stresses above those listed under “Absolute Maximum Ratings” may cause
permanent damage to the device. This is a stress rating only and functional
operation of the device at these or any other conditions above those indicated in the
operational section of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect device reliability.
2
8-pin plastic package: θJA = 100°C/Watt, θJC = 50°C/Watt
8-pin cerdip package: θJA = 110°C/Watt, θJC = 30°C/Watt
16-pin plastic SOIC package: θJA = 100°C/Watt, θJC = 30°C/Watt
ESD SUSCEPTIBILITY
An ESD classification per method 3015.6 of MIL-STD-883C
has been performed on the AD743. The AD743 is a class 1
device, passing at 1000 V and failing at 1500 V on null pins 1
and 5, when tested, using an IMCS 5000 automated ESD
tester. Pins other than null pins fail at greater than 2500 V.
ORDERING GUIDE
Package
Model Temperature Range Option*
AD743JN 0°C to +70°C N-8
AD743KN 0°C to +70°C N-8
AD743JR-16 0°C to +70°C R-16
AD743KR-16 0°C to +70°C R-16
AD743BQ –40°C to +85°C Q-8
AD743SQ/883B –55°C to +125°C Q-8
AD743JR-16-REEL 0°C to +70°C Tape & Reel
AD743KR-16-REEL 0°C to +70°C Tape & Reel
*N = Plastic DIP; R = Small Outline IC; Q = Cerdip.
METALIZATION PHOTOGRAPH
Contact factory for latest dimensions.
Dimensions shown in inches and (mm).
REV. C
–3–
AD743
–Typical Characteristics
(@ +258C, VS = +15 V)
20
R = 10kΩ
LOAD
15
10
5
INPUT VOLTAGE SWING – Volts
0
0
51015
SUPPLY VOLTAGE ± VOLTS
+V
IN
–V
IN
Figure 1. Input Voltage Swing
vs. Supply Voltage
12
9
6
QUIESCENT CURRENT– mA
3
0
0510
SUPPLY VOLTAGE ± VOLTS
15 20
20
R = 10kΩ
LOAD
15
10
5
OUTPUT VOLTAGE SWING – Volts
0
20
0510
POSITIVE
SUPPLY
NEGATIVE
SUPPLY
SUPPLY VOLTAGE ± VOLTS
15
20
Figure 2. Output Voltage Swing vs.
Supply Voltage
–6
10
–7
10
–8
10
–9
10
–10
10
INPUT BIAS CURRENT – Amps
–11
10
–12
10
–60 –40 –20
0
20 40 60 80 100
TEMPERATURE – °C
120
140
35
30
25
20
15
10
OUTPUT VOLTAGE SWING – Volts p-p
5
0
10
100
LOAD RESISTANCE – Ω
1k
Figure 3. Output Voltage Swing vs.
Load Resistance
200
100
10
1
OUTPUT IMPEDANCE – Ω
0.1
0.01
10k
100k 1M
FREQUENCY – Hz
10M
10k
100M
Figure 4. Quiescent Current vs.
Supply Voltage
300
200
100
INPUT BIAS CURRENT – pA
0
–9 –6 –3
COMMON MODE VOLTAGE – Volts
3
0–12 12
6
Figure 7. Input Bias Current vs.
Common-Mode Voltage
Figure 5. Input Bias Current vs.
Temperature
80
70
60
50
40
30
CURRENT LIMIT – mA
20
10
9
0
–40 –20 0 20 40 60 80 100 120 140
–60
+ OUTPUT
CURRENT
– OUTPUT
CURRENT
TEMPERATURE – °C
Figure 8. Short Circuit Current
Limit vs. Temperature
Figure 6. Output Impedance vs.
Frequency (Closed Loop Gain = –1)
7.0
6.0
5.0
4.0
3.0
GAIN BANDWIDTH PRODUCT – MHz
2.0
–60 –40 –20 0 20 40 60 80 100 120 140
TEMPERATURE – °C
Figure 9. Gain Bandwidth Product
vs. Temperature
REV. C–4–
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