Analog Devices AD744KR-REEL, AD744KR, AD744KN, AD744JR-REEL7, AD744JR-REEL Datasheet

Precision, 500 ns Settling

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FEATURES
AC PERFORMANCE
500 ns Settling to 0.01% for 10 V Step

1.5 ␮s Settling to 0.0025% for 10 V Step
75 V/␮s Slew Rate

0.0003% Total Harmonic Distortion (THD)
13 MHz Gain Bandwidth – Internal Compensation
>200 MHz Gain Bandwidth (G = 1000)

External Decompensation

>1000 pF Capacitive Load Drive Capability with

10 V/␮s Slew Rate – External Compensation

DC PERFORMANCE

0.5 mV max Offset Voltage (AD744B)
10 ␮V/ⴗC max Drift (AD744B)
250 V/mV min Open-Loop Gain (AD744B)
Available in Plastic Mini-DIP, Plastic SOIC, Hermetic

Cerdip, Hermetic Metal Can Packages and Chip Form

Surface Mount (SOIC) Package Available in Tape and

Reel in Accordance with EIA-481A Standard

APPLICATIONS
Output Buffers for 12-Bit, 14-Bit and 16-Bit DACs,

ADC Buffers, Cable Drivers, Wideband
Preamplifiers and Active Filters

BiFET Op Amp

AD744

CONNECTION DIAGRAMS

TO-99 (H) Package

8-Lead Plastic Mini-DIP (N)

8-Lead SOIC (R) Package and

8-Lead Cerdip (Q) Packages

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 preci­sion, 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 band­width 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 excel­lent 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/µs (AD744B).

3. The combination of Analog Devices’ advanced processing
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.

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.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: [phone] World Wide Web Site: http://www.analog.com
Fax: [phone] © Analog Devices, Inc., 2000

AD744–SPECIFICATIONS

(@ +25ⴗC and ⴞ15 V dc, unless otherwise noted)

Model Conditions Min Typ Max Min Typ Max Unit

AD744J/A/S AD744K/B/T

INPUT OFFSET VOLTAGE

1

Initial Offset 0.3 1.0 0.25 0.5 mV

Offset T
vs. Temp. 5 20 5 10 µV/°C
vs. Supply

2

vs. Supply T

Long-Term Stability 15 15 µV/month

INPUT BIAS CURRENT

3

MIN

MIN

to T

to T

MAX

MAX

2 1.0 mV

82 95 88 100 dB
82 88 dB

Either Input VCM = 0 V 30 100 30 100 pA
Either Input @ T

J, K 70°C 0.7 2.3 0.7 2.3 nA

=V

MAX

CM

= 0 V

A, B, C 85°C 1.9 6.4 1.9 6.4 nA
S, T 125°C 31 102 31 102 nA

Either Input VCM = +10 V 40 150 40 150 pA
Offset Current VCM = 0 V 20 50 10 50 pA
Offset Current @ T

J, K 70°C 0.4 1.1 0.2 1.1 nA

=V

MAX

CM

= 0 V

A, B, C 85°C 1.3 3.2 0.6 3.2 nA
S, T 125°C20521052nA

FREQUENCY RESPONSE

Gain BW, Small Signal G = –1 8 13 9 13 MHz
Full Power Response V
Slew Rate, Unity Gain G = –1 45 75 50 75 V/µs
Settling Time to 0.01%

4

= 20 V p-p 1.2 1.2 MHz

O

G = –1 0.5 0.75 0.5 0.75 µs

Total Harmonic f = 1 kHz

Distortion R1 ≥ 2 kΩ

VO = 3 V rms 0.0003 0.0003 %

INPUT IMPEDANCE

Differential 3 ⫻ 1012||5.5 3 ⫻ 1012||5.5 Ω||pF
Common Mode 3 ⫻ 1012||5.5 3 ⫻ 1012||5.5 Ω||pF

INPUT VOLTAGE RANGE

Differential
Common-Mode Voltage +14.5, –11.5 +14.5, –11.5 V
Over Max Operating Range

5

6

–11 +13 –11 +13 V

±20 ±20 V

Common-Mode

Rejection Ratio VCM = ±10 V 78 88 82 88 dB

T

to T

MIN

MIN

to T

MAX

MAX

VCM = ±11 V 72 84 78 84 dB
T

76 84 80 84 dB

70 80 74 80 dB

INPUT VOLTAGE NOISE 0.1 to 10 Hz 2 2 µV p-p

f = 10 Hz 45 45 nV/√Hz
f = 100 Hz 22 22 nV/√Hz
f = 1 kHz 18 18 nV/√Hz
f = 10 kHz 16 16 nV/√Hz

INPUT CURRENT NOISE f = 1 kHz 0.01 0.01 pA/√Hz

OPEN LOOP GAIN

7

VO = ±10 V
R

≥ 2 kΩ 200 400 250 400 V/mV

LOAD

T

MIN

to T

MAX

100 100 V/mV

OUTPUT CHARACTERISTICS

Voltage R

Current Short Circuit 25 25 mA
Capacitive Load

8

≥ 2 kΩ +13, –12.5 +13.9, –13.3 +13, –12.5 +13.9, –13.3 V

LOAD

T

MIN

to T

MAX

±12 +13.8, –13.1 ± 12 +13.8, –13.1 V

Gain = –1 1000 1000 pF

POWER SUPPLY

Rated Performance ±15 ±15 V
Operating Range ± 4.5 ± 18 ±4.5 ±18 V
Quiescent Current 3.5 5.0 3.5 4.0 mA

NOTES

1

Input offset voltage specifications are guaranteed after 5 minutes of operation at TA = +25°C.

2

PSRR 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 k, CL = 10 pF, refer to Figure 25.

5

Defined as voltage between inputs, such that neither exceeds ±10 V from ground.

6

Typically exceeding –14.1 V negative common-mode voltage on either input results in an output phase reversal.

7

Open-Loop Gain is specified with VOS both nulled and unnulled.

8

Capacitive load drive specified for C

Refer to Table II for optimum compensation while driving a capacitive load.

Specifications subject to change without notice. All min and max specifications are guaranteed.

= 20 pF with the device connected as shown in Figure 32. Under these conditions, slew rate = 14 V/µs and 0.01% settling time = 1.5 µs typical.

COMP

–2–

REV.C

AD744

ABSOLUTE MAXIMUM RATINGS

Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±18 V

Internal Power Dissipation
Input Voltage

3

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±18 V

2

. . . . . . . . . . . . . . . . . . . . 500 mW

1

Output Short Circuit Duration . . . . . . . . . . . . . . . . Indefinite

Differential Input Voltage . . . . . . . . . . . . . . . . . . +V

and –V

S

S

Storage Temperature Range (Q, H) . . . . . . –65°C to +150°C

Storage Temperature Range (N, R) . . . . . . . –65°C to +125°C

Operating Temperature Range

AD744J/K . . . . . . . . . . . . . . . . . . . . . . . . . . . 0°C to +70°C

AD744A/B . . . . . . . . . . . . . . . . . . . . . . . . . –40°C to +85°C

AD744S/T . . . . . . . . . . . . . . . . . . . . . . . . –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 perma-

nent damage to the device. This is a stress rating only; 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

Thermal Characteristics

8-Lead Plastic Package: θJA = 100°C/Watt, θJC = 33°C/Watt
8-Lead Cerdip Package: θJA = 110°C/Watt, θJC = 22°C/Watt
8-Lead Metal Can Package: θJA = 150°C/Watt, θJC = 65°C/Watt
8-Lead SOIC Package: θJA = 160°C/Watt, θJC = 42°C/Watt

3

For supply voltages less than ± 18 V, the absolute maximum input voltage is equal

to the supply voltage.

METALIZATION PHOTOGRAPH

Contact factory for latest dimensions.

Dimensions shown in inches and (mm).

ORDERING GUIDE

Temperature Package

Model Range Option*

AD744JN 0°C to +70°C N-8
AD744KN 0°C to +70°C N-8
AD744JR 0°C to +70°C SO-8
AD744KR 0°C to +70°C SO-8
AD744AQ –40°C to +85°C Q-8
AD744BQ –40°C to +85°C Q-8
AD744AH –40°C to +85°C H-08A
AD744JCHIPS 0°C to +70°CDie
AD744JR-REEL 0°C to +70°C Tape/Reel 13"
AD744JR-REEL 7 0°C to +70°C Tape/Reel 7"
AD744KR-REEL 0°C to +70°C Tape/Reel 13"
AD744KR-REEL 7 0°C to +70°C Tape/Reel 7"
AD744TA/883B –55°C to +125°C H-08

*N = Plastic DIP; SO = Small Outline IC; Q = Cerdip; H = TO-99 Metal Can.

REV. C

–3–

AD744

–Typical Characteristics

Figure 1. Input Voltage Swing
vs. Supply Voltage

Figure 4. Quiescent Current vs.
Supply Voltage

Figure 2. Output Voltage Swing
vs. Supply Voltage

Figure 5. Input Bias Current vs.
Temperature

Figure 3. Output Voltage Swing vs.
Load Resistance

Figure 6. Output Impedance vs.
Frequency

Figure 7. Input Bias Current vs.
Common-Mode Voltage

Figure 8. Short Circuit Current
Limit vs. Temperature

–4–

Figure 9. Gain Bandwidth
Product vs. Temperature

REV. C