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

a		Precision, 500 ns Settling
		BiFET Op Amp
		AD744

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

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/ s with full stability.

Alternatively, external decompensation may be used to increase the gain bandwidth of the AD744 to over 200 MHz at high

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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.

CONNECTION DIAGRAMS

TO-99 (H) Package

8-Lead Plastic Mini-DIP (N)

8-Lead SOIC (R) Package and

8-Lead Cerdip (Q) Packages

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/ s (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.

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 (@ +25 C and 15 V dc, unless otherwise noted)

			AD744J/A/S		AD744K/B/T
Model	Conditions	Min	Typ	Max	Min	Typ	Max	Unit
INPUT OFFSET VOLTAGE1
Initial Offset			0.3	1.0		0.25	0.5	mV
Offset	TMIN to TMAX			2			1.0	mV
vs. Temp.			5	20		5	10	µV/°C
vs. Supply2		82	95		88	100		dB
vs. Supply	TMIN to TMAX	82			88			dB
Long-Term Stability			15			15		µV/month
INPUT BIAS CURRENT3
Either Input	VCM = 0 V		30	100		30	100	pA
Either Input @ TMAX =	VCM = 0 V
J, K	70°C		0.7	2.3		0.7	2.3	nA
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 @ TMAX =	VCM = 0 V
J, K	70°C		0.4	1.1		0.2	1.1	nA
A, B, C	85°C		1.3	3.2		0.6	3.2	nA
S, T	125°C		20	52		10	52	nA
FREQUENCY RESPONSE
Gain BW, Small Signal	G = –1	8	13		9	13		MHz
Full Power Response	VO = 20 V p-p		1.2			1.2		MHz
Slew Rate, Unity Gain	G = –1	45	75		50	75		V/µs
Settling Time to 0.01%4	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			3 1012||5.5			3 1012||5.5		Ω||pF
Differential
Common Mode			3 1012||5.5			3 1012||5.5		Ω||pF
INPUT VOLTAGE RANGE			± 20			± 20
Differential5								V
Common-Mode Voltage			+14.5, –11.5			+14.5, –11.5		V
Over Max Operating Range6		–11		+13	–11		+13	V
Common-Mode	VCM = ± 10 V
Rejection Ratio		78	88		82	88		dB
	TMIN to TMAX	76	84		80	84		dB
	VCM = ± 11 V	72	84		78	84		dB
	TMIN to TMAX	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 GAIN7	VO = ± 10 V
	RLOAD ≥ 2 kΩ	200	400		250	400		V/mV
	TMIN to TMAX	100			100			V/mV
OUTPUT CHARACTERISTICS	RLOAD ≥ 2 kΩ
Voltage		+13, –12.5	+13.9, –13.3		+13, –12.5	+13.9, –13.3		V
	TMIN to TMAX	± 12	+13.8, –13.1		± 12	+13.8, –13.1		V
Current	Short Circuit		25			25		mA
Capacitive Load8	Gain = –1			1000			1000	pF
POWER SUPPLY			± 15			± 15
Rated Performance		± 4.5		± 18	± 4.5		± 18	V
Operating Range								V
Quiescent Current			3.5	5.0		3.5	4.0	mA

NOTES

1Input offset voltage specifications are guaranteed after 5 minutes of operation at TA = +25°C. 2PSRR test conditions: +VS = 15 V, –VS = –12 V to –18 V and +VS = +12 V to +18 V, –VS = –15 V.

3Bias 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. 4Gain = –1, RL = 2 k, CL = 10 pF, refer to Figure 25.

5Defined as voltage between inputs, such that neither exceeds ±10 V from ground.

6Typically exceeding –14.1 V negative common-mode voltage on either input results in an output phase reversal. 7Open-Loop Gain is specified with VOS both nulled and unnulled.

8Capacitive load drive specified for CCOMP = 20 pF with the device connected as shown in Figure 32. Under these conditions, slew rate = 14 V/ s and 0.01% settling time = 1.5 s 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.

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AD744

ABSOLUTE MAXIMUM RATINGS1	±18 V
Supply Voltage . . . . . . . . . . . . . . . . . . . . . . .
Internal Power Dissipation2 . . . . . . . . . . . . . .	. . . . . . 500 mW
Input Voltage3 . . . . . . . . . . . . . . . . . . . . . . . .	. . . . . . . . ±18 V
Output Short Circuit Duration . . . . . . . . . . .	. . . . . Indefinite
Differential Input Voltage . . . . . . . . . . . . . . .	. . . +VS and –VS
Storage Temperature Range (Q, H) . . . . . .	–65°C to +150°C
Storage Temperature Range (N, R) . . . . . . .	–65°C to +125°C
Operating Temperature Range	0°C to +70°C
AD744J/K . . . . . . . . . . . . . . . . . . . . . . . . .
AD744A/B . . . . . . . . . . . . . . . . . . . . . . . . .	–40°C to +85°C
AD744S/T . . . . . . . . . . . . . . . . . . . . . . . .	–55°C to +125°C

Lead Temperature Range (Soldering 60 seconds) . . . . . 300°C

NOTES

1Stresses above those listed under Absolute Maximum Ratings may cause permanent 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.

2Thermal 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

3For supply voltages less than ± 18 V, the absolute maximum input voltage is equal to the supply voltage.

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°C	Die
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.

METALIZATION PHOTOGRAPH

Contact factory for latest dimensions. Dimensions shown in inches and (mm).

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AD744 –Typical Characteristics

Figure 1. Input Voltage Swing vs. Supply Voltage

Figure 4. Quiescent Current vs. Supply Voltage

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

Figure 2. Output Voltage Swing vs. Supply Voltage

Figure 5. Input Bias Current vs. Temperature

Figure 8. Short Circuit Current Limit vs. Temperature

Figure 3. Output Voltage Swing vs. Load Resistance

Figure 6. Output Impedance vs. Frequency

Figure 9. Gain Bandwidth

Product vs. Temperature

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