AD744 Analog Devices, AD744 Datasheet

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AD744

Manufacturer Part Number
AD744
Description
Precision/ 500 ns Settling BiFET Op Amp
Manufacturer
Analog Devices
Datasheet

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PRODUCT DESCRIPTION
The AD744 is a fast-settling, precision, FET input, monolithic
operational amplifier. It offers the excellent dc characteristics
of the AD711 BiFET family with enhanced settling, slew rate,
and bandwidth. The AD744 also offers the option of using
custom compensation to achieve exceptional capacitive load
drive capability.
The single-pole response of the AD744 provides fast settling:
500 ns to 0.01%. This feature, combined with its high dc preci-
sion, makes it suitable for use as a buffer amplifier for 12-bit,
14-bit or 16-bit DACs and ADCs. Furthermore, the AD744’s low
total harmonic distortion (THD) level of 0.0003% and gain band-
width product of 13 MHz make it an ideal amplifier for demanding
audio applications. It is also an excellent choice for use in active
filters in 12-bit, 14-bit and 16-bit data acquisition systems.
The AD744 is internally compensated for stable operation as a
unity gain inverter or as a noninverting amplifier with a gain of
two or greater. External compensation may be applied to the
AD744 for stable operation as a unity gain follower. External
compensation also allows the AD744 to drive 1000 pF capacitive
loads, slewing at 10 V/µs with full stability.
Alternatively, external decompensation may be used to increase
the gain bandwidth of the AD744 to over 200 MHz at high
gains. This makes the AD744 ideal for use as ac preamps in
digital signal processing (DSP) front ends.
The AD744 is available in five performance grades. The AD744J
and AD744K are rated over the commercial temperature range
of 0°C to +70°C. The AD744A and AD744B are rated over
the industrial temperature range of –40°C to +85°C. The AD744T
is rated over the military temperature range of –55°C to +125°C
and is available processed to MIL-STD-883B, Rev. C.
The AD744 is available in an 8-lead plastic mini-DIP, 8-lead
small outline, 8-lead cerdip or TO-99 metal can.
PRODUCT HIGHLIGHTS
1. The AD744 is a high-speed BiFET op amp that offers excel-
2. The AD744 offers exceptional dynamic response. It settles to
3. The combination of Analog Devices’ advanced processing
lent performance at competitive prices. It outperforms the
OPA602/OPA606, LF356 and LF400.
0.01% in 500 ns and has a 100% tested minimum slew rate
of 50 V/µs (AD744B).
technology, laser wafer drift trimming and well-matched
ionimplanted JFETs provide outstanding dc precision. Input
offset voltage, input bias current, and input offset current are
specified in the warmed-up condition; all are 100% tested.
Precision, 500 ns Settling
8-Lead SOIC (R) Package and
8-Lead Plastic Mini-DIP (N)
8-Lead Cerdip (Q) Packages
CONNECTION DIAGRAMS
TO-99 (H) Package
BiFET Op Amp
AD744

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AD744 Summary of contents

Page 1

... The AD744 is available in an 8-lead plastic mini-DIP, 8-lead small outline, 8-lead cerdip or TO-99 metal can. PRODUCT HIGHLIGHTS 1. The AD744 is a high-speed BiFET op amp that offers excel- lent performance at competitive prices. It outperforms the OPA602/OPA606, LF356 and LF400. 2. The AD744 offers exceptional dynamic response. It settles to 0.01% in 500 ns and has a 100% tested minimum slew rate of 50 V/µ ...

Page 2

... MAX 25 1000 ± 15 ± 4.5 ± 18 3.5 5.0 = +25° + +18 V, –V = – +25°C. For higher temperature, the current doubles every 10°C. A AD744K/B/T Min Typ Max Unit 0.25 0.5 mV 1.0 mV µV/° 100 µV/month 15 ...

Page 3

... Differential Input Voltage . . . . . . . . . . . . . . . . . . +V Storage Temperature Range ( –65°C to +150°C Storage Temperature Range ( –65°C to +125°C Operating Temperature Range AD744J 0°C to +70°C AD744A –40°C to +85°C AD744S –55°C to +125°C Lead Temperature Range (Soldering 60 seconds 300°C ...

Page 4

... AD744 –Typical Characteristics ...

Page 5

... AD744 ...

Page 6

... AD744–Typical Characteristics ...

Page 7

... V overload quickly enough to allow accurate measurement of the AD744’s 500 ns settling time. Amplifier very high-speed FET-input op amp; it provides a voltage gain of 10, amplifying the error signal output of the AD744 under test. 0 ...

Page 8

... This is accomplished by connecting a capacitor between Pins 5 and 8. Figure 28, a simplified schematic of the AD744, shows where this capacitor is connected. This feature is useful because it allows the AD744 to be used as a unity gain voltage follower. It also enables the amplifier to drive capacitive loads up to 2000 pF and greater. ...

Page 9

... NOTES 1 Bandwidth with C adjusted for minimum settling time. LEAD Into large capacitive loads the AD744’ output current limit sets the slew rate of the amplifier µs, equal to 0.025 2 amps divided by the value of C specified with a 50 pF. load. C LEAD R2 ...

Page 10

... I-to-V conversion be accomplished without increasing the settling time or without degrading the accuracy of the DAC. Figure schematic of an AD565A DAC using an AD744 output buffer. The capacitor compensates for the LEAD DAC’ ...

Page 11

... When R and I are replaced with their Thevenin equivalents, the general purpose inverting amplifier model of Figure 40 is created. Here capacitor C capacitance of the AD744 (5.5 pF) plus any stray capacitance due to wiring and the type of IC package employed AD744 – ...

Page 12

... As an aid to the designer, the optimum value of C cific amplifier connection can be determined from the graph of Figure 41. This graph has been produced for the case where the AD744 is connected as in Figures 39 and 40 with a practical minimum value for and a total C ...

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