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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/ C 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
PRODUCT DESCRIPTION
Precision, 500 ns Settling
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
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-
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/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: 781/329-4700
World Wide Web Site: http://www.analog.com
Fax: 781/326-8703
© Analog Devices, Inc., 2000
AD744–SPECIFICATIONS
Model
INPUT OFFSET VOLTAGE
1
Initial Offset
Offset
vs. Temp.
vs. Supply
2
vs. Supply
Long-Term Stability
INPUT BIAS CURRENT
3
Either Input
Either Input @ T
MAX
=
J, K
A, B, C
S, T
Either Input
Offset Current
Offset Current @ T
MAX
=
J, K
A, B, C
S, T
FREQUENCY RESPONSE
Gain BW, Small Signal
Full Power Response
Slew Rate, Unity Gain
Settling Time to 0.01%
4
Total Harmonic
Distortion
INPUT IMPEDANCE
Differential
Common Mode
INPUT VOLTAGE RANGE
Differential
5
Common-Mode Voltage
Over Max Operating Range
6
Common-Mode
Rejection Ratio
Conditions
T
MIN
to T
MAX
(@ +25 C and
Min
Typ
0.3
5
95
15
15 V dc, unless otherwise noted)
AD744K/B/T
Max
1.0
2
20
88
88
Min
Typ
0.25
5
100
15
100
2.3
6.4
102
150
50
1.1
3.2
52
9
50
0.75
30
0.7
1.9
31
40
10
0.2
0.6
10
13
1.2
75
0.5
100
2.3
6.4
102
150
50
1.1
3.2
52
Max
0.5
1.0
10
Unit
mV
mV
µV/°C
dB
dB
µV/month
pA
nA
nA
nA
pA
pA
nA
nA
nA
MHz
MHz
V/µs
µs
AD744J/A/S
T
MIN
to T
MAX
82
82
V
CM
= 0 V
V
CM
= 0 V
70°C
85°C
125°C
V
CM
= +10 V
V
CM
= 0 V
V
CM
= 0 V
70°C
85°C
125°C
G = –1
V
O
= 20 V p-p
G = –1
G = –1
f = 1 kHz
R1
≥
2 kΩ
V
O
= 3 V rms
8
45
30
0.7
1.9
31
40
20
0.4
1.3
20
13
1.2
75
0.5
0.75
0.0003
3
3
10
12
||5.5
10
12
||5.5
0.0003
3
3
10
12
||5.5
10
12
||5.5
%
Ω||pF
Ω||pF
V
V
V
dB
dB
dB
dB
µV
p-p
nV/√Hz
nV/√Hz
nV/√Hz
nV/√Hz
pA/√Hz
V/mV
V/mV
V
V
mA
pF
V
V
mA
±
20
+14.5, –11.5
–11
V
CM
=
±
10 V
T
MIN
to T
MAX
V
CM
=
±
11 V
T
MIN
to T
MAX
0.1 to 10 Hz
f = 10 Hz
f = 100 Hz
f = 1 kHz
f = 10 kHz
f = 1 kHz
V
O
=
±
10 V
R
LOAD
≥
2 kΩ
T
MIN
to T
MAX
R
LOAD
≥
2 kΩ
T
MIN
to T
MAX
Short Circuit
Gain = –1
200
100
+13,
–12.5
±
12
78
76
72
70
88
84
84
80
2
45
22
18
16
0.01
400
250
100
+13, –12.5
±
12
1000
±
15
3.5
+13
–11
82
80
78
74
±
20
+14.5, –11.5
+13
88
84
84
80
2
45
22
18
16
0.01
400
INPUT VOLTAGE NOISE
INPUT CURRENT NOISE
OPEN LOOP GAIN
7
OUTPUT CHARACTERISTICS
Voltage
Current
Capacitive Load
8
POWER SUPPLY
Rated Performance
Operating Range
Quiescent Current
+13.9, –13.3
+13.8, –13.1
25
+13.9, –13.3
+13.8, –13.1
25
1000
±
15
3.5
±
4.5
±
18
5.0
±
4.5
±
18
4.0
NOTES
1
Input offset voltage specifications are guaranteed after 5 minutes of operation at T
A
= +25°C.
2
PSRR test conditions: +V
S
= 15 V, –V
S
= –12 V to –18 V and +V
S
= +12 V to +18 V, –V
S
= –15 V.
3
Bias Current Specifications are guaranteed maximum at either input after 5 minutes of operation at T
A
= +25°C. For higher temperature, the current doubles every 10°C.
4
Gain = –1, R
L
= 2 k, C
L
= 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 V
OS
both nulled and unnulled.
8
Capacitive load drive specified for C
COMP
= 20 pF with the device connected as shown in Figure 32. Under these conditions, slew rate = 14 V/
µ
s and 0.01% settling time = 1.5
µs
typical.
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.
–2–
REV.C
AD744
ABSOLUTE MAXIMUM RATINGS
1
Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
±
18 V
Internal Power Dissipation
2
. . . . . . . . . . . . . . . . . . . . 500 mW
Input Voltage
3
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
±
18 V
Output Short Circuit Duration . . . . . . . . . . . . . . . . Indefinite
Differential Input Voltage . . . . . . . . . . . . . . . . . . +V
S
and –V
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:
θ
JA
= 100°C/Watt,
θ
JC
= 33°C/Watt
8-Lead Cerdip Package:
θ
JA
= 110°C/Watt,
θ
JC
= 22°C/Watt
8-Lead Metal Can Package:
θ
JA
= 150°C/Watt,
θ
JC
= 65°C/Watt
8-Lead SOIC Package:
θ
JA
= 160°C/Watt,
θ
JC
= 42°C/Watt
3
For supply voltages less than
±
18 V, the absolute maximum input voltage is equal
to the supply voltage.
ORDERING GUIDE
Model
AD744JN
AD744KN
AD744JR
AD744KR
AD744AQ
AD744BQ
AD744AH
AD744JCHIPS
AD744JR-REEL
AD744JR-REEL 7
AD744KR-REEL
AD744KR-REEL 7
AD744TA/883B
Temperature
Range
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
–55°C to +125°C
Package
Option*
N-8
N-8
SO-8
SO-8
Q-8
Q-8
H-08A
Die
Tape/Reel 13"
Tape/Reel 7"
Tape/Reel 13"
Tape/Reel 7"
H-08
*N
= Plastic DIP; SO = Small Outline IC; Q = Cerdip; H = TO-99 Metal Can.
METALIZATION PHOTOGRAPH
Contact factory for latest dimensions.
Dimensions shown in inches and (mm).
REV. C
–3–
AD744 –Typical Characteristics
Figure 1. Input Voltage Swing
vs. Supply Voltage
Figure 2. Output Voltage Swing
vs. Supply Voltage
Figure 3. Output Voltage Swing vs.
Load Resistance
Figure 4. Quiescent Current vs.
Supply Voltage
Figure 5. Input Bias Current vs.
Temperature
Figure 6. Output Impedance vs.
Frequency
Figure 7. Input Bias Current vs.
Common-Mode Voltage
Figure 8. Short Circuit Current
Limit vs. Temperature
Figure 9. Gain Bandwidth
Product vs. Temperature
–4–
REV. C
