Analog Devices AD743SQ-883B, AD743KR-16-REEL, AD743KR-16, AD743KN, AD743JR-16-REEL Datasheet

Ultralow Noise

a

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 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/␮s Slew Rate

4.5 MHz Unity-Gain Bandwidth
THD = 0.0003% @ 1 kHz
Available in Tape and Reel in Accordance with

EIA-481A Standard

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

4.0nV/√Hz at 10 KHz is unsurpassed for a FET-input 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 is rated over the
commercial temperature range of 0°C to 70°C.

The AD743 is available in 8-Lead plastic mini-DIP, and
16-pin SOIC.

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.

BiFET Op Amp

AD743

CONNECTION DIAGRAMS

8-Lead Plastic Mini-DIP (N)

1

NULL

2

–IN

3

+IN

–V

4

S

NC = NO CONNECT

AD743

TOP VIEW

8

8

NC

+V

7

6

OUT

NULL

5

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/√Hz permits a three
op amp instrumentation amplifier, using three AD743s, to be
built which exhibits less than 4.2 nV/√Hz noise at 10 KHz
and which has low input bias currents.

1000

R

SOURCE

100

10

INPUT NOISE VOLTAGE – nV/ Hz

1

R

SOURCE

AD743 & RESISTOR

OR

OP27 & RESISTOR

RESISTOR NOISE ONLY

100

1k

SOURCE RESISTANCE – Ω

Input Noise Voltage vs. Source Resistance

16-Lead SOIC (R) Package

1

NC

OFFSET

S

E

O

(– – –)

10k 100k

2

NULL

3

–IN

4

NC

+IN

5

–V

6

S

7

NC

8

NC

NC = NO CONNECT

OP27 &
RESISTOR

( — )

AD743 + RESISTOR

AD743

)

(

1M

16 NC

15

14

13

12

11

10

10M

8

9

NC

NC

+V

S

OUTPUT

OFFSET
NULL

NC

NC

REV. D

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 that
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] www.analog.com
Fax: [phone] © Analog Devices, Inc., 2002

AD743–SPECIFICATIONS

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

Model Conditions Min Typ Max Min Typ Max Unit

AD743J AD743K

INPUT OFFSET VOLTAGE

1

Initial Offset 0.25 1.0/0.8 0.1 0.5/0.25 mV
Initial Offset T
vs. Temp. T
vs. Supply (PSRR) 12 V to 18 V
vs. Supply (PSRR) T

INPUT BIAS CURRENT

3

MIN

MIN

MIN

to T

to T

to T

MAX

MAX

MAX

2

90 96 100 106 dB

21µV/°C

88 98 100 dB

1.5 1.0/0.50 mV

Either Input VCM = 0 V 150 400 150 250 pA
Either Input

@ T

MAX

Either Input V

VCM = 0 V 8.8/25.6 5.5/16 nA

= 10 V 250 600 250 400 pA

CM

Either Input, VS = ±5 V VCM = 0 V 30 200 30 125 pA

INPUT OFFSET CURRENT VCM = 0 V 40 150 30 75 pA

Offset Curren

@ T

MAX

VCM = 0 V 2.2/6.4 1.1/3.2 nA

FREQUENCY RESPONSE

Gain BW, Small Signal G = –1 4.5 4.5 MHz
Full Power Response VO = 20 V p-p 25 25 kHz
Slew Rate, Unity Gain G = –1 2.8 2.8 V/µs
Settling Time to 0.01% 6 6 µs
Total Harmonic f = 1 kHz

Distortion4 (Figure 16) G = –1 0.0003 0.0003 %

INPUT IMPEDANCE

Differential 1 ⫻ 1010||20 1 ⫻ 1010||20 Ω||pF
Common Mode 3 ⫻ 1011||18 3 ⫻ 1011||18 Ω||pF

INPUT VOLTAGE RANGE

Differential
Common-Mode Voltage +13.3, –10.7 +13.3, –10.7 V
Over Max Operating Range

5

6

–10 +12 –10 +12 V

±20 ±20 V

Common-Mode

Rejection Ratio VCM = ±10 V 80 95 90 102 dB

T

MIN

to T

MAX

78 88 dB

INPUT VOLTAGE NOISE 0.1 Hz to 10 Hz 0.38 0.38 1.0 µV p-p

f = 10 Hz 5.5 5.5 10.0 nV/√Hz
f = 100 Hz 3.6 3.6 6.0 nV/√Hz
f = 1 kHz 3.2 5.0 3.2 5.0 nV/√Hz
f = 10 kHz 2.9 4.0 2.9 4.0 nV/√Hz

INPUT CURRENT NOISE f = 1 kHz 6.9 6.9 fA/√Hz

OPEN LOOP GAIN VO = ±10 V

R

≥ 2 kΩ 1000 4000 2000 4000 V/mV

LOAD

T

to T

MIN

R

MAX

= 600 Ω 1200 1200 V/mV

LOAD

800 1800 V/mV

OUTPUT CHARACTERISTICS

Voltage R

≥ 600 Ω +13, –12 +13, –12 V

LOAD

R

≥ 600 Ω +13.6, –12.6 +13.6, –12.6 V

LOAD

T

to T

MIN

R

MAX

≥ 2 kΩ±12 +13.8, –13.1 ±12 +13.8, –13.1 V

LOAD

+12, –10 +12, –10 V

Current Short Circuit 20 40 20 40 mA

POWER SUPPLY

Rated Performance ±15 ±15 V
Operating Range ±4.8 ±18 ±4.8 ±18 V
Quiescent Current 8.1 10.0 8.1 10.0 mA

TRANSISTOR COUNT # of Transistors 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. D

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 (N, R) . . . . . . . –65°C to +125°C

Operating Temperature Range

AD743J . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0°C to 70°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
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
AD743JR-16 0°C to +70°C R-16
AD743KR-16
AD743SQ/883B

2

2

2

0°C to +70°C N-8

0°C to +70°C R-16
–55°C to +125°C Q-8

1

AD743JR-16-REEL 0°C to +70°C Tape & Reel
AD743KR-16-REEL20°C to +70°C Tape & Reel

1

N = Plastic DIP; R = Small Outline IC; Q = Cerdip.

2

Not for new design, obsolete april 2002

REV. D

–3–

AD743

–60 –40 –20 0 20 40 60 80 100 120 140

3.0

4.0

5.0

6.0

7.0

2.0

TEMPERATURE – °C

GAIN BANDWIDTH PRODUCT

– MHz

–Typical Performance Characteristics

(@ 25ⴗC, VS = 15 V)

20

R = 10kΩ

LOAD

15

– Volts

10

5

INPUT VOLTAGE SWING

0

0

51015

SUPPLY VOLTAGE ± VOLTS

+V

IN

–V

IN

TPC 1. Input Voltage Swing
vs. Supply Voltage

12

9

– mA

6

QUIESCENT CURRENT

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

TPC 2. Output Voltage Swing vs.
Supply Voltage

–6

10

–7

10

–8

10

– Amps

–9

10

–10

10

INPUT BIAS CURRENT

–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

TPC 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

TPC 4. Quiescent Current vs.
Supply Voltage

300

200

100

INPUT BIAS CURRENT – pA

0

–9 –6 –3

COMMON MODE VOLTAGE – Volts

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

3

0–12 12

9

6

TPC 5. Input Bias Current vs.
Temperature

80

70

60

50

40

30

CURRENT LIMIT – mA

20

10

0

–40 –20 0 20 40 60 80 100 120 140

–60

+ OUTPUT
CURRENT

– OUTPUT
CURRENT

TEMPERATURE – °C

TPC 8. Short Circuit Current
Limit vs. Temperature

TPC 6. Output Impedance vs.
Frequency (Closed Loop Gain = –1)

TPC 9. Gain Bandwidth Product
vs. Temperature

REV. D–4–