Analog Devices AD844SQ-883B, AD844SQ, AD844SCHIPS, AD844JR-16-REEL7, AD844JR-16-REEL Datasheet

a		60 MHz, 2000 V/ s
		Monolithic Op Amp
		AD844

FEATURES

Wide Bandwidth: 60 MHz at Gain of –1 Wide Bandwidth: 33 MHz at Gain of –10

Very High Output Slew Rate: Up to 2000 V/ s

20 MHz Full Power Bandwidth, 20 V p-p, RL = 500

Fast Settling: 100 ns to 0.1% (10 V Step) Differential Gain Error: 0.03% at 4.4 MHz Differential Phase Error: 0.158 at 4.4 MHz High Output Drive: 650 mA into 50 Load

Low Offset Voltage: 150 mV Max (B Grade) Low Quiescent Current: 6.5 mA

Available in Tape and Reel in Accordance with EIA-481A Standard

APPLICATIONS

Flash ADC Input Amplifiers

High-Speed Current DAC Interfaces

Video Buffers and Cable Drivers

Pulse Amplifiers

CONNECTION DIAGRAMS

8-Lead Plastic (N),	16-Lead SOIC
and Cerdip (Q) Packages	(R) Package

NULL	1	AD844
–IN	2
+IN	3
–VS	4	TOP VIEW
		(Not to Scale)

8	NC	1	AD844	16	NC
	NULL
	OFFSETNULL	2		15	OFFSETNULL
7	+VS				V+
	–IN	3		14
6	OUTPUT
	NC	4		13	NC
5	TZ
	+IN	5		12	OUTPUT
	NC	6		11	TZ
	V–	7		10	NC
	NC	8	TOP VIEW	9	NC
			(Not to Scale)

NC = NO CONNECT

PRODUCT DESCRIPTION

The AD844 is a high-speed monolithic operational amplifier fabricated using Analog Devices’ junction isolated complementary bipolar (CB) process. It combines high bandwidth and very fast large signal response with excellent dc performance. Although optimized for use in current to voltage applications and as an inverting mode amplifier, it is also suitable for use in many noninverting applications.

The AD844 can be used in place of traditional op amps, but its current feedback architecture results in much better ac performance, high linearity and an exceptionally clean pulse response.

This type of op amp provides a closed-loop bandwidth which is determined primarily by the feedback resistor and is almost independent of the closed-loop gain. The AD844 is free from the slew rate limitations inherent in traditional op amps and other current-feedback op amps. Peak output rate of change can be over 2000 V/µs for a full 20 V output step. Settling time is typically 100 ns to 0.1%, and essentially independent of gain. The AD844 can drive 50 Ω loads to ±2.5 V with low distortion and is short circuit protected to 80 mA.

The AD844 is available in four performance grades and three package options. In the 16-lead SOIC (R) package, the AD844J is specified for the commercial temperature range of 0°C to 70°C. The AD844A and AD844B are specified for the industrial temperature range of –40°C to +85°C and are available in the cerdip (Q)

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.

package. The AD844A is also available in an 8-lead plastic mini-DIP (N). The AD844S is specified over the military temperature range of –55°C to +125°C. It is available in the 8-lead cerdip (Q) package. “A” and “S” grade chips and devices processed to MIL-STD-883B, REV. C are also available.

PRODUCT HIGHLIGHTS

1.The AD844 is a versatile, low cost component providing an excellent combination of ac and dc performance.

2.It is essentially free from slew rate limitations. Rise and fall times are essentially independent of output level.

3.The AD844 can be operated from ± 4.5 V to ± 18 V power supplies and is capable of driving loads down to 50 Ω, as well as driving very large capacitive loads using an external network.

4.The offset voltage and input bias currents of the AD844 are

laser trimmed to minimize dc errors; VOS drift is typically 1 µV/°C and bias current drift is typically 9 nA/°C.

5.The AD844 exhibits excellent differential gain and differential phase characteristics, making it suitable for a variety of video applications with bandwidths up to 60 MHz.

6.The AD844 combines low distortion, low noise and low drift with wide bandwidth, making it outstanding as an input amplifier for flash A/D converters.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: [phone]	www.analog.com
Fax: [phone]	© Analog Devices, Inc., 2001

AD844–SPECIFICATIONS (@ TA = 25 C and VS = 15 V dc, unless otherwise noted)

			AD844J/A			AD844B		AD844S
Model	Conditions	Min	Typ	Max	Min	Typ	Max	Min	Typ	Max	Unit
INPUT OFFSET VOLTAGE1			50	300		50	150		50	300	µV
TMIN–TMAX			75	500		75	200		125	500	µV
vs. Temperature			1			1	5		1	5	µV/°C
vs. Supply	5 V–18 V										µV/V
Initial			4	20		4	10		4	20
TMIN–TMAX	VCM = ± 10 V		4			4	10		4	20	µV/V
vs. Common Mode											µV/V
Initial			10	35		10	20		10	35
TMIN–TMAX			10			10	20		10	35	µV/V
INPUT BIAS CURRENT
–Input Bias Current1			200	450		150	250		200	450	nA
TMIN–TMAX			800	1500		750	1100		1900	2500	nA
vs. Temperature			9			9	15		20	30	nA/°C
vs. Supply	5 V–18 V
Initial			175	250		175	200		175	250	nA/V
TMIN–TMAX	VCM = ± 10 V		220			220	240		220	300	nA/V
vs. Common Mode
Initial			90	160		90	110		90	160	nA/V
TMIN–TMAX			110			110	150		120	200	nA/V
+Input Bias Current1			150	400		100	200		100	400	nA
TMIN–TMAX			350	700		300	500		800	1300	nA
vs. Temperature			3			3	7		7	15	nA/°C
vs. Supply	5 V–18 V
Initial			80	150		80	100		80	150	nA/V
TMIN–TMAX	VCM = ± 10 V		100			100	120		120	200	nA/V
vs. Common Mode
Initial			90	150		90	120		90	150	nA/V
TMIN–TMAX			130			130	190		140	200	nA/V
INPUT CHARACTERISTICS
Input Resistance											Ω
–Input			50	65		50	65		50	65
+Input		7	10		7	10		7	10		MΩ
Input Capacitance
–Input			2			2			2		pF
+Input			2			2			2		pF
Input Voltage Range		± 10			± 10			± 10
Common Mode											V
INPUT VOLTAGE NOISE	f ≥ 1 kHz		2			2			2		nV/√Hz
INPUT CURRENT NOISE	f ≥ 1 kHz										pA/√Hz
–Input			10			10			10
+Input	f ≥ 1 kHz		12			12			12		pA/√Hz
OPEN LOOP TRANSRESISTANCE	VOUT = ± 10 V
	RLOAD = 500 Ω	2.2	3.0		2.8	3.0		2.2	3.0		MΩ
TMIN–TMAX		1.3	2.0		1.6	2.0		1.3	1.6		MΩ
Transcapacitance			4.5			4.5			4.5		pF
DIFFERENTIAL GAIN ERROR2	f = 4.4 MHz		0.03			0.03			0.03		%
DIFFERENTIAL PHASE ERROR2	f = 4.4 MHz		0.15			0.15			0.15		Degree
FREQUENCY RESPONSE
Small Signal Bandwidth
Gain = –13			60			60			60		MHz
Gain = –104			33			33			33		MHz
TOTAL HARMOMIC DISTORTION	f = 100 kHz,
	2 V rms5		0.005			0.005			0.005		%
SETTLING TIME	± 15 V Supplies
10 V Output Step
Gain = –1, to 0.1%5			100			100			100		ns
Gain = –10, to 0.1%6	± 5 V Supplies		100			100			100		ns
2 V Output Step
Gain = –1, to 0.1%5			110			110			110		ns
Gain = –10, to 0.1%6			100			100			100		ns

–2–

REV. D

θJA = 90°C/W θJA = 110°C/W θJA = 100°C/W

											AD844
		AD844J/A				AD844B			AD844S
Model	Conditions	Min	Typ	Max	Min	Typ	Max	Min	Typ	Max		Unit
OUTPUT SLEW RATE	Overdriven											V/µs
	Input	1200	2000		1200	2000		1200	2000
FULL POWER BANDWIDTH	VS = ± 15 V
VOUT = 20 V p-p5			20			20			20			MHz
VOUT = 2 V p-p5	VS = ± 5 V		20			20			20			MHz
	THD = 3%
OUTPUT CHARACTERISTICS	RLOAD = 500 Ω											± V
Voltage		10	11		10	11		10	11
Short Circuit Current			80			80			80			mA
TMIN–TMAX			60			60			60			mA
Output Resistance	Open Loop		15			15			15			Ω
POWER SUPPLY
Operating Range		± 4.5		± 18	± 4.5		± 18	+4.5		± 18		V
Quiescent Current			6.5	7.5		6.5	7.5		6.5	7.5		mA
TMIN–TMAX			7.5	8.5		7.5	8.5		8.5	9.5		mA

NOTES

1Rated performance after a 5 minute warmup at TA = 25°C.

2Input signal 285 mV p-p carrier (40 IRE) riding on 0 mV to 642 mV (90 IRE) ramp. R L= 100 Ω; R1, R2 = 300 Ω. 3Input signal 0 dBm, CL = 10 pF, RL = 500 Ω, R1 = 500 Ω, R2 = 500 Ω in Figure 2.

4Input signal 0 dBm, CL =10 pF, RL = 500 Ω, R1 = 500 Ω, R2 = 50 Ω in Figure 2. 5CL = 10 pF, RL = 500 Ω, R1 = 1 kΩ, R2 = 1 kΩ in Figure 2.

6CL = 10 pF, RL = 500 Ω, R1 = 500 Ω, R2 = 50 Ω in Figure 2.

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

ABSOLUTE MAXIMUM RATINGS1	± 18 V
Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . .
Power Dissipation2 . . . . . . . . . . . . . . . . . . . .	. . . . . . . . 1.1 W
Output Short Circuit Duration . . . . . . . . . . .	. . . . . . Indefinite
Common-Mode Input Voltage . . . . . . . . . . .	. . . . . . . . . . ± VS
Differential Input Voltage . . . . . . . . . . . . . . .	. . . . . . . . . . 6 V
Inverting Input Current
Continuous . . . . . . . . . . . . . . . . . . . . . . . .	. . . . . . . . . 5 mA
Transient . . . . . . . . . . . . . . . . . . . . . . . . . .	. . . . . . . . 10 mA
Storage Temperature Range (Q) . . . . . . . . .	–65°C to +150°C
(N, R) . . . . . . .	–65°C to +125°C
Lead Temperature Range (Soldering 60 sec) .	. . . . . . . . 300°C
ESD Rating . . . . . . . . . . . . . . . . . . . . . . . . . .	. . . . . . . 1000 V

ORDERING GUIDE

	Temperature	Package
Model	Range	Option*
AD844AN	–40°C to +85°C	N-8
AD844ACHIPS	–40°C to +85°C	Die
AD844AQ	–40°C to +85°C	Q-8
AD844BQ	–40°C to +85°C	Q-8
AD844JR-16	0°C to 70°C	R-16
AD844JR-16-REEL	0°C to 70°C	13" Tape
	0°C to 70°C	and Reel
AD844JR-16-REEL7		7" Tape
	–55°C to +125°C	and Reel
AD844SCHIPS		Die
AD844SQ	–55°C to +125°C	Q-8
AD844SQ/883B	–55°C to +125°C	Q-8
5962-8964401PA	–55°C to +125°C	Q-8

*N = Plastic DIP; Q = Cerdip; R = Small Outline IC (SOIC).

NOTES

1Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device at these or any other conditions above those indicated in the operational sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.

28-Lead Plastic Package:

8-Lead Cerdip Package:

16-Lead SOIC Package:

METALIZATION PHOTOGRAPH

Contact factory for latest dimensions.

Dimension shown in inches and (mm).

REV. D

–3–

AD844–Typical Characteristics (TA = 25 C and VS = 15 V, unless otherwise noted)

MHz–	70
	60
BANDWIDTH3dB–
	40
	50
	30
			5	10		15			20
	0
			SUPPLY VOLTAGE – V
	TPC 1. –3 dB Bandwidth vs.
	Supply Voltage R1 = R2 = 500 Ω
– V	20
			TA = 25 C
VOLTAGEOUTPUT	15
OF THE	10
MAGNITUDE	5
	0
			5	10		15			20
	0

SUPPLY VOLTAGE – V

TPC 4. Noninverting Input Voltage Swing vs. Supply Voltage

–60

– dB

–70

–80

DISTORTION

1V rms

–90

HARMONIC

–100

–110

2ND HARMONIC

–120

–130

3RD HARMONIC

10k

100

1k

100k

INPUT FREQUENCY – Hz

TPC 2. Harmonic Distortion vs.

Frequency, R1 = R2 = 1 kΩ

– V

20

RL = 500

VOLTAGEOUTPUT

TA

= 25 C

15

OF THE

10

MAGNITUDE

5

0

5

10

15

20

0

SUPPLY VOLTAGE – V

TPC 5. Output Voltage Swing vs. Supply Voltage

	5
														RL =
M	4
–																RL = 500
TRANSRESISTANCE	3
	2
																RL = 50
	1
	0
				0						50				100						150
	–50
						TEMPERATURE – C
	TPC 3. Transresistance vs.
	Temperature
	10
– mA	9
	8
CURRENT
	7			VS = 15V
SUPPLY	6									VS	=	5V
	5

4

–60 –40 –20 0 20 40 60 80 100 120 140 TEMPERATURE – C

TPC 6. Quiescent Supply Current vs. Temperature and Supply Voltage

	2						100
A	1						10
–						–
CURRENTBIASINPUT				IBN		IMPEDANCEOUTPUT		5V SUPPLIES
	0			IBP			1
	–1						0.1
	–2						0.01		1M	10M
		0	50	100			10k	100k			100M
	–50				150
			TEMPERATURE – C						FREQUENCY – Hz

TPC 7. Inverting Input Bias Cur-	TPC 8. Output Impedance vs.
rent (IBN) and Noninverting Input	Frequency, Gain = –1, R1 = R2 = 1 kΩ
Bias Current (IBP) vs. Temperature

	40
	35					VS = 15V
– MHz	30
BANDWIDTH	25				VS = 5V
	20
–3dB
	15
	10
	–60 –40 –20	0	20 40	60	80	100 120	140
		TEMPERATURE – C

TPC 9. –3 dB Bandwidth vs. Temperature, Gain = –1, R1 = R2 = 1 kΩ

–4–

REV. 0

Inverting Gain-of-1 AC Characteristics
		+VS			6		R1 = R2 = 500
		4.7
	0.22 F
		R1			0
				dB	–6		R1 = R2 = 1k
	R2
VIN				–
	–
				GAIN
	AD844		VOUT		–12
	+
		RL	CL		–18
	0.22 F	4.7
					–24
	–VS				100k	1M	10M	100M
						FREQUENCY – Hz

TPC 10. Inverting Amplifier,	TPC 11. Gain vs. Frequency for
Gain of –1 (R1 = R2)	Gain = –1, RL = 500 Ω, CL = 0 pF

AD844

–180

Degrees–

–210

–240

R1 = R2 = 500

PHASE

–270

R1 = R2 = 1k

–300

–330

0

25

50

FREQUENCY – MHz

TPC 12. Phase vs. Frequency Gain = –1, RL = 500 Ω, CL = 0 pF

TPC 13. Large Signal Pulse	TPC 14. Small Signal Pulse
Response, Gain = –1, R1 = R2 = 1 kΩ	Response, Gain = –1, R1 = R2 = 1 kΩ

Inverting Gain-of-10 AC Characteristics

				26
		+VS				RL = 500
	0.22 F	4.7		20
		500	dB–	14		RL = 50
			GAIN
VIN	–			8
	50
	AD844		VOUT
	+			2
		RL	CL
	0.22 F			–4
		4.7		100k	1M	10M	100M
					FREQUENCY – Hz
	–VS
TPC 15. Gain of –10 Amplifier				TPC 16. Gain vs. Frequency,
				Gain = –10

–180

Degrees

–210

–240

RL

= 500

–

PHASE

–270

RL = 50

–300

–330

25

0

50

FREQUENCY – MHz

TPC 17. Phase vs. Frequency, Gain = –10

REV. D

–5–