AD745 Analog Devices, AD745 Datasheet

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AD745

Manufacturer Part Number
AD745
Description
Ultralow Noise, High Speed, BiFET Op Amp
Manufacturer
Analog Devices
Datasheet

Specifications of AD745

-3db Bandwidth
20MHz
Slew Rate
12.5V/µs
Vos
250µV
Ib
150pA
# Opamps Per Pkg
1
Input Noise (nv/rthz)
2.9nV/rtHz
Vcc-vee
9.6V to 36V
Isy Per Amplifier
10mA
Packages
DIP,SOIC

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a
PRODUCT DESCRIPTION
The AD745 is an ultralow noise, high speed, FET input
operational amplifier. It offers both the ultralow voltage noise
and high speed generally associated with bipolar input op amps
and the very low input currents of FET input devices. Its 20
MHz bandwidth and 12.5 V/ s slew rate makes the AD745 an
ideal amplifier for high speed applications demanding low noise
and high dc precision. Furthermore, the AD745 does not
exhibit an output phase reversal.
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.
FEATURES
ULTRALOW NOISE PERFORMANCE
2.9 nV/ Hz at 10 kHz
0.38 V p-p, 0.1 Hz to 10 Hz
6.9 fA/ Hz Current Noise at 1 kHz
EXCELLENT AC PERFORMANCE
12.5 V/ s Slew Rate
20 MHz Gain Bandwidth Product
THD = 0.0002% @ 1 kHz
Internally Compensated for Gains of +5 (or –4) or
EXCELLENT DC PERFORMANCE
0.5 mV max Offset Voltage
250 pA max Input Bias Current
2000 V/mV min Open Loop Gain
Available in Tape and Reel in Accordance with
APPLICATIONS
Sonar
Photodiode and IR Detector Amplifiers
Accelerometers
Low Noise Preamplifiers
High Performance Audio
Greater
EIA-481A Standard
1000
100
10
1
100
AD745 & RESISTOR
OP37 & RESISTOR
R
R
SOURCE
SOURCE
OR
1k
E
O
RESISTOR NOISE ONLY
SOURCE RESISTANCE –
10k
(– – –)
RESISTOR
OP37 &
AD745 + RESISTOR
100k
( — )
(
)
1M
10M
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 617/329-4700
The AD745’s guaranteed, tested maximum input voltage noise
of 4 nV/ Hz at 10 kHz is unsurpassed for a FET-input mono-
lithic op amp, as is its maximum 1.0 V p-p noise in a 0.1 Hz to
10 Hz bandwidth. The AD745 also has excellent dc perfor-
mance with 250 pA maximum input bias current and 0.5 mV
maximum offset voltage.
The internal compensation of the AD745 is optimized for
higher gains, providing a much higher bandwidth and a faster
slew rate. This makes the AD745 especially useful as a
preamplifier where low level signals require an amplifier that
provides both high amplification and wide bandwidth at these
higher gains. The AD745 is available in five performance
grades. The AD745J and AD745K are rated over the
commercial temperature range of 0 C to +70 C. The AD745A
and AD745B are rated over the industrial temperature range of
–40 C to +85 C. The AD745S is rated over the military
temperature range of –55 C to +125 C and is available
processed to MIL-STD-883B, Rev. C.
The AD745 is available in 8-pin plastic mini-DIP, 8-pin cerdip,
16-pin SOIC, or in chip form.
8-Pin Plastic Mini-DIP (N) &
8-Pin Cerdip (Q) Packages
OFFSET
120
100
–20
NULL 1
80
60
40
20
0
– IN
–V
+IN
100
S
High Speed, BiFET Op Amp
NC = NO CONNECT
2
3
4
TOP VIEW
AD745
1k
CONNECTION DIAGRAMS
GAIN
10k
FREQUENCY – Hz
8
7
6
5
OUTPUT
NC
+V
OFFSET
NULL
100k
S
OFFSET
Ultralow Noise,
NULL
– IN
–V
+IN
1M
16-Pin SOIC (R) Package
NC
NC
NC
NC
PHASE
S
1
6
8
4
5
2
3
7
10M 100M
TOP VIEW
AD745
AD745
Fax: 617/326-8703
120
100
60
40
20
0
–20
80
16
14
13
11
15
12
10
9
OUTPUT
NC
NC
NC
NC
+V
OFFSET
NULL
NC
S

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AD745 Summary of contents

Page 1

... The AD745J and AD745K are rated over the commercial temperature range +70 C. The AD745A and AD745B are rated over the industrial temperature range of – +85 C. The AD745S is rated over the military temperature range of – +125 C and is available processed to MIL-STD-883B, Rev. C. ...

Page 2

... L 5 Defined as voltagc between inputs, such that neither exceeds 10 V from common. 6 The AD745 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. (@ +25 C and 15 V dc, unless otherwise noted) ...

Page 3

... Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Output Short-Circuit Duration . . . . . . . . . . . . . . . . Indefinite Differential Input Voltage . . . . . . . . . . . . . . . . . . +V Storage Temperature Range ( – +150 C Storage Temperature Range ( – +125 C Operating Temperature Range AD745J +70 C AD745A – +85 C AD745S . . . . . . . . . . . . . . . . . . . . . . . . . . – +125 C Lead Temperature Range (Soldering 60 sec +300 C NOTES 1 Stresses above those listed under “Absolute Maximum Ratings” may cause permanent damage to the device ...

Page 4

... AD745 –Typical Characteristics 10k LOAD – – SUPPLY VOLTAGE VOLTS Figure 1. Input Voltage Swing vs. Supply Voltage SUPPLY VOLTAGE VOLTS Figure 4. Quiescent Current vs. Supply Voltage 300 200 100 0 –12 –9 –6 – COMMON-MODE VOLTAGE – Volts Figure 7. Input Bias Current vs. Common-Mode Voltage ...

Page 5

... FREQUENCY – Hz Figure 14. Power Supply Rejection vs. Frequency 100 CLOSED-LOOP GAIN = +5 10 1.0 0.1 10 100 1k 10k 100k 1M 10M FREQUENCY – Hz Figure 17. Input Noise Voltage Spectral Density –5– AD745 150 140 130 120 100 SUPPLY VOLTAGE VOLTS Figure 12. Open-Loop Gain vs. Supply Voltage 35 30 ...

Page 6

... Figure 22b. Gain of 5 Follower Large Signal Pulse Response 2 s 100 Figure 23b. Gain of 4 Inverter Large Signal Pulse Response –6– 0 AD745 ADJUST –V S Figure 21. Offset Null Configuration, 8-Pin Package Pinout 500nS 100 50mV Figure 22c. Gain of 5 Follower Small ...

Page 7

... Hz with a 1/f power spectral density. For the AD745 the typical value of current noise is 6.9 fA kHz. Using the formula, I Johnson noise of a resistor, expressed as a current, one can see AD745 + RESISTOR that the current noise of the AD745 is equivalent to that 3.45 ...

Page 8

... Figures 26 and 27 show two ways to buffer and amplify the output of a charge output transducer. Both require using an amplifier which has a very high input impedance, such as the AD745. Figure 26 shows a model of a charge amplifier circuit. Here, amplification depends on the principle of conservation of charge at the input of amplifier A1, which requires that the ...

Page 9

... This graph can be JA used to predict bias current after has been computed. Again JA bias current will double for every 10 C. The designer using the AD745 in chip form (Figure 33) must also be concerned with both and , since can be affected by the type of die JC ...

Page 10

... Precision accelerometers are typi- cally calibrated for a charge output (pC/g).* Figures 35a and 35b show two ways in which to configure the AD745 as a low noise charge amplifier for use with a wide variety of piezoelectric accelerometers. The input sensitivity of these circuits will be de- ...

Page 11

... I/V conversion gain, may be augmented with further gain. A wideband low noise amplifier such as the AD829 is recommended in this application. This principle can also be used to apply the AD745 in a high performance audio application. Figure 38 shows that an I-V converter of a high performance DAC, here the AD1862, can be designed to take advantage of the low voltage noise of the AD745 (2 ...

Page 12

... TYP 0.419 (10.64) 0.394 (10.01) 0.310 (7.87) 0.220 (5.59) 0.104 (2.64) 0.003 (2.36) SEATING PLANE 0.015 (0.38) 0.008 (0.20) –12– OUTPUT AD745 INVERTING B CONNECTION 0.30 (7.62) REF + 0.011 0.003 - + (0.28 0.08) - 16-Pin SOIC (R) Package 16 9 0.292 (7.42) 0.300 (7.62) 0.0500 (1.27) ...

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