Analog Devices OP285GP, OP285GSR, OP285GS Datasheet

a		Dual 9 MHz Precision
		Operational Amplifier
						OP285*
	FEATURES	PIN CONNECTIONS
	Low Offset Voltage: 250 V
	Low Noise: 6 nV/√ Hz
	Low Distortion: 0.0006%	8-Lead Narrow-Body SO (S-Suffix)
	High Slew Rate: 22 V/ s
	Wide Bandwidth: 9 MHz					V+
	Low Supply Current: 5 mA	OUT A	1		8
						OUT B
	Low Offset Current: 2 nA	–IN A	2	OP285	7
	Unity-Gain Stable	+IN A	3	TOP VIEW	6	–IN B
				(Not to Scale)
						+IN B
	SO-8 Package	V–	4		5

APPLICATIONS

High Performance Audio

Active Filters

Fast Amplifiers

Integrators

GENERAL DESCRIPTION

The OP285 is a precision high-speed amplifier featuring the Butler Amplifier front-end. This new front-end design combines the accuracy and low noise performance of bipolar transistors with the speed of JFETs. This yields an amplifier with high slew rates, low offset and good noise performance at low supply currents. Bias currents are also low compared to bipolar designs.

The OP285 offers the slew rate and low power of a JFET amplifier combined with the precision, low noise and low drift of a bipolar amplifier. Input offset voltage is laser-trimmed and guaranteed less than 250 V. This makes the OP285 useful in dc-coupled or summing applications without the need for special selections or the added noise of additional offset adjustment circuitry. Slew rates of 22 V/ s and a bandwidth of 9 MHz make the OP285 one of the most accurate medium speed amplifiers available.

8-Lead Epoxy DIP (P-Suffix)

OUT A	1				8	V+
–IN A	2	– +			7	OUT B
+IN A	3		+	–	6	–IN B
V–	4	OP285			5	+IN B

The combination of low noise, speed and accuracy can be used to build high speed instrumentation systems. Circuits such as instrumentation amplifiers, ramp generators, bi-quad filters and dc-coupled audio systems are all practical with the OP285. For applications that require long term stability, the OP285 has a guaranteed maximum long term drift specification.

The OP285 is specified over the XIND—extended industrial— (–40°C to +85°C) temperature range. OP285s are available in 8-pin plastic DIP and SOIC-8 surface mount packages.

*Patents pending

REV. A

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., 2001

OP285–SPECIFICATIONS (@ Vs = 15.0 V, TA = 25 C, unless otherwise noted.)

Parameter	Symbol	Conditions	Min	Typ	Max	Unit
INPUT CHARACTERISTICS						µV
Offset Voltage	VOS			35	250
	VOS	–40°C ≤ TA ≤ +85°C			600	µV
Input Bias Current	IB	VCM = 0 V		100	350	nA
	IB	VCM = 0 V, –40°C ≤ TA ≤ +85°C			400	nA
Input Offset Current	IOS	VCM = 0 V		2	±50	nA
	IOS	VCM = 0 V, –40°C ≤ TA ≤ +85°C		2	±100	nA
Input Voltage Range	VCM	VCM = ±10.5 V,	–10.5		10.5	V
Common-Mode Rejection	CMRR
		–40°C ≤ TA ≤ +85°C	80	106		dB
Large-Signal Voltage Gain	AVO	RL = 2 kΩ	250			V/mV
	AVO	RL = 2 kΩ, –40°C ≤ TA ≤ +85°C	175			V/mV
	AVO	RL = 600 Ω		200		V/mV
Common-Mode Input Capacitance				7.5		pF
Differential Input Capacitance				3.7		pF
Long-Term Offset Voltage	∆VOS	Note 1			300	µV
Offset Voltage Drift	∆VOS/∆T			1		µV/°C
OUTPUT CHARACTERISTICS		RL = 2 kΩ
Output Voltage Swing	VO		–13.5	+13.9	+13.5	V
	VO	RL = 2 kΩ, –40°C ≤ TA ≤ +85°C	–13	+13.9	+13	V
		RL = 600 Ω, VS = ±18 V		–16/+14		V
POWER SUPPLY		VS = ±4.5 V to ±18 V
Power Supply Rejection Ratio	PSRR		85	111		dB
	PSRR	VS = ±4.5 V to ±18 V,
		–40°C ≤ TA ≤ +85°C	80			dB
Supply Current	ISY	VS = ±4.5 V to ±18 V, VO = 0 V,
		RL = x, –40°C ≤ TA ≤ +85°C		4	5	mA
	ISY	VS = ±22 V, VO, = 0 V, RL = x
		–40°C ≤ TA ≤ +85°C	± 4.5		5.5	mA
Supply Voltage Range	VS				±22	V
DYNAMIC PERFORMANCE		RL = 2 kΩ				V/µs
Slew Rate	SR		15	22
Gain Bandwidth Product	GBP			9		MHz
Phase Margin	o			62		Degrees
Settling Time	ts	To 0.1%, 10 V Step		625		ns
	ts	To 0.01%, 10 V Step		750		ns
Distortion		AV = 1, VOUT = 8.5 V p-p,
		f = 1 kHz, RL = 2 kΩ		–104		dB
Voltage Noise Density	en	f = 30 Hz		7		nV/√Hz
	en	f = 1 kHz		6		nV/√Hz
Current Noise Density	in	f = 1 kHz		0.9		pA/√Hz
Headroom		THD + Noise ≤ 0.01%,
		RL = 2 kΩ, VS = ±18 V		>12.9		dBu

NOTE

1Long-term offset voltage is guaranteed by a 1,000 hour life test performed on three independent wafer lots at 125 °C, with an LTPD of 1.3.

Specifications subject to change without notice.

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REV. A

OP285

ABSOLUTE MAXIMUM RATINGS1	± 22
Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . .		V
Input Voltage2 . . . . . . . . . . . . . . . . . . . . . . . .	. . . . . . . . ± 18	V
Differential Input Voltage2 . . . . . . . . . . . . . . .	. . . . . . . ± 7.5	V
Output Short-Circuit Duration to Gnd3 . . . .	. . . . . Indefinite
Storage Temperature Range	–65°C to +150°C
P, S Package . . . . . . . . . . . . . . . . . . . . . . .
Operating Temperature Range	–40°C to +85°C
OP285G . . . . . . . . . . . . . . . . . . . . . . . . . . .
Junction Temperature Range	–65°C to +150°C
P, S Package . . . . . . . . . . . . . . . . . . . . . . .
Lead Temperature Range (Soldering 60 Sec)	. . . . . . . . 300°C

Package Type	JA4	JC	Unit
8-Pin Plastic DIP (P)	103	43	°C/W
8-Pin SOIC (S)	158	43	°C/W

NOTES

1Absolute Maximum Ratings apply to packaged parts, unless otherwise noted. 2For supply voltages less than ± 7.5 V, the absolute maximum input voltage is equal to the supply voltage.

3Shorts to either supply may destroy the device. See data sheet for full details. 4 JA is specified for the worst case conditions, i.e., JA is specified for device in socket for cerdip, P-DIP, and LCC packages; JA is specified for device soldered in circuit board for SOIC package.

ORDERING GUIDE

	Temperature	Package	Package
Model	Range	Description	Option
OP285GP*	–40°C to +85°C	8-Pin Plastic DIP	N-8
OP285GS	–40°C to +85°C	8-Pin SOIC	S0-8
OP285GSR	–40°C to +85°C	S0-8 Reel, 2500 pcs.

*Not for new designs. Obsolete April 2002.

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 OP285 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.

WARNING!

ESD SENSITIVE DEVICE

REV. A

–3–

OP285
	25	TA = 25 C
	20
– V		RL = 2k
	15				+VOM
SWING	10
	5
VOLTAGE
	0
	–5
OUTPUT	–10
	–15				–VOM
	–20
	–25	5	10	15	20	25
	0

SUPPLY VOLTAGE – V

TPC 1. Output Voltage Swing vs. Supply Voltage

	1500
	VS = 15V
	VO = 10V
V/MV	1250
				+GAIN
	1000			RL = 2k
–
GAIN	750				–GAIN
-LOOP
					RL = 2k
	500	+GAIN
OPEN
		RL = 600
	250				–GAIN
					RL = 600
	0
	–50	–25	0	25	50	75	100
		TEMPERATURE –				C

TPC 2. Open-Loop Gain

vs. Temperature

	50	VS = 15V							50
													VS = 15V
		RL = 2k
	45								40				TA = +25 C
					–SR					AVCL = +100
s	40							–dB
									30
–RATESLEWV/								GAINLOOP-CLOSED
									20	AVCL = +10
	35
									10
	30				+SR				0	AVCL = +1
	25								–10
									–20
	20								–30
	–50	–25	0	25	50	75	100
									1k	10k	100k	1M	10M	100M
			TEMPERATURE – C
										FREQUENCY – Hz

TPC 4. Slew Rate vs. Temperature	TPC 5. Closed-Loop Gain
	vs. Frequency

	30	VS = 15V
	25	RL = 2k
s	20
– V/
RATE	15	+SR
				–SR
SLEW
	10
	5
	0
	0	0.2	0.4	0.6	0.8	1.0

DIFFERENTIAL INPUT VOLTAGE – V

TPC 3. Slew Rate vs. Differential Input Voltage

	60				VS = 15V
	50				TA = 25 C
	40			AVCL = +1
–
IMPEDANCE	30		AVCL = +10
	20	AVCL = +100
	10
	0	1k	10k	100k	1M	10M
	100
			FREQUENCY – Hz

TPC 6. Closed-Loop Output Imped ance vs. Frequency

	120
dB					VS = 15V
	100				TA = 25 C
–
REJECTION	80
	60
MODE	40
COMMON
	20
	0	1k	10k	100k	1M	10M
	100

FREQUENCY – Hz

TPC 7. Common-Mode Rejection vs. Frequency

	120
dB	100
–					+PSRR
REJECTION
	80	VS = 15V
		TA = 25 C
	60
SUPPLY
				–PSRR
	40
POWER	20
	0
	10	100	1k	10k	100k	1M
			FREQUENCY – Hz

TPC 8. Power Supply Rejection vs. Frequency

	100
	80			VS = 15V
			GAIN	RL = 2k			0
	60			TA = 25 C			45
– dB
					0N = 58			PHASE – Degrees
MIN	40	PHASE					90
OPEN-LOOP G
	20						135
	0						180
	–20						225
	–40						270
	–60
	1k	10k	100k	1M	10M	100M

FREQUENCY – Hz

TPC 9. Open-Loop Gain, Phase vs. Frequency

–4–

REV. A

11						65
MHz							MARGINPHASE– Degrees
BANDWIDTHGAINPRODUCT –						60
10				øM
9						55
		GBW
8						50
7		0				40
–50	–25		25	50	75	100

TEMPERATURE – C

TPC 10. Gain Bandwidth Product, Phase Margin vs. Temperature

Typical Performance Characteristics–OP285

	100
	90		AVCL = +1
	80		NEGATIVE EDGE
– %	70
	60
OVERSHOOT			AVCL= +1
	50		POSITIVE EDGE
	40
	30		VS =	15V
	20		RL = 2k
			VIN = 100mV p-p
	10
	0
	0	100	200	300	400	500

LOAD CAPACITANCE – pF

TPC 11. Small-Signal Overshoot vs.| Load Capacitance

	16
Volts	14
	–VOM
	12
–
SWING	10
OUTPUT	8
	6	+VOM
MAXIMUM	4	TA = 25 C
	2	VS =	15V
	0
	100	1k	10k

LOAD RESISTANCE –

TPC 12. Maximum Output Voltage vs. Load Resistance

	30						5.0
V	25
–						mA–CURRENT
SWINGOUTPUT							4.5
	20
								TA = +85 C
	15						4.0	TA = +25 C
MAXIMUM						SUPPLY
	5	TA = 25 C						TA = –40 C
	10
		VS = 15V					3.5
		AVCL = +1
		RL = 2k
	0						3.0
	1k	10k	100k	1M	10M
							0	5	10	15	25
		FREQUENCY – Hz
								SUPPLY VOLTAGE – V

	TPC 13. Maximum Output Swing	TPC 14. Supply Current vs.
	vs. Frequency
		Supply Voltage

	300
											VS = 15V
– nA	250
	150
CURRENT
BIAS	200
	100
INPUT
	50
	0
	–50		–25		0		25		50		75		100

TEMPERATURE – C

TPC 16. Input Bias Current vs. Temperature

5

VS

=

Hz

15V

TA = 25 C

4

– pA/

DENSITY

3

NOISE

2

CURRENT

1

10

100

1k

100k

FREQUENCY – Hz

TPC 17. Current Noise Density vs. Frequency

	120
– mA	110											VS =		15V
	100
CURRENT
	90
			SINK
OUTPUT	80
	70
ABSOLUTE	60
	30
	50
	40		SOURCE
	20
						0
	–50		–25					25		50		75		100

TEMPERATURE – C

TPC 15. Short Circuit Current vs. Temperature

250

–40 C TA +85 C

402 OP AMPS

200

150 UNITS

100

50

0

0	1	2	3	4	5	6	7	8	9	10
				TC VOS – V/			C

TPC 18. tC VOS Distribution

REV. A

–5–