Analog Devices AD746 Datasheet

Dual Precision, 500 ns

a

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

m

s Slew Rate

75 V/

0.0001% Total Harmonic Distortion (THD)
13 MHz Gain Bandwidth
Internal Compensation for Gains of +2 or Greater

DC PERFORMANCE

0.5 mV max Offset Voltage (AD746B)
10 mV/8C max Drift (AD746B)
175 V/mV min Open Loop Gain (AD746B)
2 mV p-p Noise, 0.1 Hz to 10 Hz
Available in Plastic Mini-DIP, Cerdip and Surface

Mount Packages

Available in Tape and Reel in Accordance with

EIA-481A Standard
MIL-STD-883B Processing also Available
Single Version: AD744

APPLICATIONS
Dual Output Buffers for 12- and 14-Bit DACs
Input Buffers for Precision ADCs, Wideband

Preamplifiers and Low Distortion Audio Circuitry

Settling, BiFET Op Amp

AD746

CONNECTION DIAGRAM

Plastic Mini-DIP (N)

Cerdip (Q) and

Plastic SOIC (R) Packages

The AD746 is available in three 8-pin packages: plastic mini
DIP, hermetic cerdip and surface mount (SOIC).

PRODUCT DESCRIPTION

The AD746 is a dual operational amplifier, consisting of two
AD744 BiFET op amps on a single chip. These precision
monolithic op amps offer excellent dc characteristics plus rapid
settling times, high slew rates and ample bandwidths. In
addition, the AD746 provides the close matching ac and dc
characteristics inherent to amplifiers sharing the same
monolithic die.

The single pole response of the AD746 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 12­or 14-bit DACs and ADCs. Furthermore, the AD746’s low total
harmonic distortion (THD) level of 0.0001% and very close
matching ac characteristics make it an ideal amplifier for many
demanding audio applications.

The AD746 is internally compensated for stable operation as a
unity gain inverter or as a noninverting amplifier with a gain of 2
or greater. It is available in four performance grades. The
AD746J is rated over the commercial temperature range of 0 to
+70°C. The AD746A and AD746B are rated over the industrial
temperature range of –40°C to +85°C. The AD746S is rated
over the military temperature range of –55°C to +125°C and is
available processed to MIL-STD-883B, Rev. C.

PRODUCT HIGHLIGHTS

1. The AD746 offers exceptional dynamic response for high
speed data acquisition systems. It settles to 0.01% in 500 ns
and has a 100% tested minimum slew rate of 50 V/µs
(AD746B).

2. Outstanding dc precision is provided by a combination of
Analog Devices’ advanced processing technology, laser wafer
drift trimming and well-matched ion-implanted JFETs. Input
offset voltage, input bias current and input offset current are
specified in the warmed-up condition and are 100% tested.

3. Differential and multichannel systems will benefit from the
AD746’s very close matching of ac characteristics. Input
offset voltage specs are fully tested and guaranteed to a
maximum of 0.5 mV (AD746B).

4. The AD746 has very close, guaranteed matching of input
bias current between its two amplifiers.

5. Unity gain stable version AD712 also available.

REV. B

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] Fax: [phone]

AD746–SPECIFICATIONS

(@ +258C and 615 V dc, unless otherwise noted)

Model Conditions Min Typ Max Min Typ Max Min Typ Max Units

AD746J/A AD746B AD746S

INPUT OFFSET VOLTAGE

1

Initial Offset 0.3 1.5 0.25 0.5 0.3 1.0 mV

Offset T
vs. Temperature 12 20 5 10 12 20 µV/°C

MIN

to T

MAX

2.0 0.7 1.5 mV

vs. Supply2 (PSRR) 80 95 84 100 80 95 dB
vs. Supply (PSRR) T

Long Term Stability 15 15 15 µV/month

INPUT BIAS CURRENT

Either Input VCM = 0 V 110 250 110 150 110 250 pA
Either Input @ T
Either Input VCM = +10 V 145 350 145 200 145 350 pA
Offset Current VCM = 0 V 45 125 45 75 45 125 pA
Offset Current @ T

MATCHING CHARACTERISTICS

Input Offset Voltage 0.6 1.5 0.3 0.5 0.6 1.0 mV

3

MAX

MAX

Input Offset Voltage T
Input Offset Voltage Drift 20 20 20 µV/°C
Input Bias Current 125 75 125 pA

MIN

to T

80 84 80 dB

MAX

VCM = 0 V 2.5/7 5.7/16 7 9.6 113 256 nA

VCM = 0 V 1.0/3 2.8/8 3 4.8 45 128 nA

MIN

to T

MAX

2.0 0.7 1.5 mV

Crosstalk @ 1 kHz 120 120 120 dB

@ 100 kHz 90 90 90 dB

FREQUENCY RESPONSE

Gain BW, Small Signal G = –1 8 13 9 13 8 13 MHz
Slew Rate, Unity Gain G = –1 45 75 50 75 45 75 V/µs
Full Power Response VO = 20 V p-p 600 600 600 kHz
Settling Time to 0.01%
Total Harmonic f = 1 kHz

Distortion R1 ≥ 2 kΩ

4

G = 1 0.5 0.75 0.5 0.75 0.5 0.75 µs

VO = 3 V rms 0.0001 0.0001 0.0001 %

INPUT IMPEDANCE

Differential 2.5 × l01li5.5 2.5 × l01li5.5 2.5 × l01li5.5 ΩipF
Common Mode 2.5 × l01li5.5 2.5 × l01li5.5 2.5 × l01li5.5 ΩipF

INPUT VOLTAGE RANGE

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

5

6

–11 +13 –11 +13 –11 +13 V

±20 ±20 ±20 V

Common-Mode Rejection Ratio VCM = ±10 V 78 88 82 88 78 88 dB

T

to T

MIN

VCM = ±11 V 72 84 78 84 72 84 dB
T

to T

MIN

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

f = 10 Hz 45 45 45 nV/ÏHz

76 84 80 84 76 84 dB

MAX

70 80 74 80 70 80 dB

MAX

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

INPUT CURRENT NOISE f = 1 kHz 0.01 0.01 0.01 pA/ÏHz

OPEN LOOP GAIN VO = ±10 V

R1 ≥ 2 kΩ 150 300 175 300 150 300 V/mV
T

MIN

to T

75 200 75 200 65 175 V/mV

MAX

OUTPUT CHARACTERISTICS

Voltage R1 ≥ 2 kΩ +13, –12.5 +13.9, –13.3 +13, –12.5 +13.9, –13.3 +13, –12.5 +13.9, –13.3 V

T

to T

Current Short Circuit 25 25 25 mA

MIN

±12 +13.8, –13.1 612 +13.8, –13.1 612 +13.8, –13.1 V

MAX

Max Capacitive Load Gain = –1 50 50 50 pF

Driving Capability Gain = –10 500 500 500 pF

POWER SUPPLY

Rated Performance ±15 ±15 ±15 V
Operating Range 64.5 618 64.5 618 64.5 618 V
Quiescent Current 7 10 7 8.0 7 10 mA

TEMPERATURE RANGE

Rated Performance 0 to +70/–40 to +85 –40 to +85 –55 to +125 °C

PACKAGE OPTIONS

8-Pin Plastic Mini-DIP (N-8) AD746JN
8-Pin Cerdip (Q-8) AD746AQ AD746BQ AD746SQ
8-Pin Surface Mount (R-8) AD746JR
Tape and Reel AD746JR-REEL
Chips AD746SCHIPS

TRANSISTOR COUNT 54 54 54

–2–

REV. B

WARNING!

ESD SENSITIVE DEVICE

AD746

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 T

10°C.

4

Gain = –1, Rl = 2 k, Cl = 10 pF.

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.

Specifications subject to change without notice.
Specifications in boldface are tested on all production units at final electrical test. Results from those tests are used to calculate outgoing quality levels. All min and
max specifications are guaranteed, although only those shown in boldface are tested on all production units.

= +25°C. For higher temperature, the current doubles every

A

ABSOLUTE MAXIMUM RATINGS

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

Internal Power Dissipation

2

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

Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .±V

1

S

Output Short Circuit Duration

(For One Amplifier) . . . . . . . . . . . . . . . . . . . . . . . Indefinite

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

and –V

S

S

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

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

Operating Temperature Range

AD746J . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .0°C to +70°C

AD746A/B . . . . . . . . . . . . . . . . . . . . . . . . . .–40°C to +85°C

AD746S . . . . . . . . . . . . . . . . . . . . . . . . . . . –55°C to +125°C

METALIZATION PHOTOGRAPH

Contact factory for latest dimensions.

Dimensions shown in inches and (mm).

Lead Temperature Range

(Soldering 60 seconds) . . . . . . . . . . . . . . . . . . . . . . . +300°C

ESD Rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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
8-Pin Cerdip Package: θJA = 110°C/Watt, θJC = 30°C/Watt
8-Pin Small Outline Package: θJA = 160°C/Watt, θJC = 42°C/Watt

CAUTION

ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily
accumulate on the human body and test equipment and can discharge without detection.
Although the AD746 features proprietary ESD protection circuitry, permanent damage may
occur on devices subjected to high energy electrostatic discharges. Therefore, proper ESD
precautions are recommended to avoid performance degradation or loss of functionality.

REV. B

–3–