Texas Instruments OPA2350EA, OPA350EA, OPA2350PA, OPA2350UA, OPA350PA Schematic [ru]

Product	Sample &	Technical	Tools &	Support &			Reference
Folder	Buy	Documents	Software	Community			Design

OPA350, OPA2350, OPA4350

SBOS099D –SEPTEMBER 2000 –REVISED DECEMBER 2015

OPAx350 High-Speed, Single-Supply, Rail-to-Rail Operational Amplifiers MicroAmplifier

Series

1 Features

•Rail-to-Rail Input

•Rail-to-Rail Output (Within 10 mV)

•Wide Bandwidth: 38 MHz

•High Slew Rate: 22 V/μs

•Low Noise: 5 nV/√Hz

•Low THD+Noise: 0.0006%

•Unity-Gain Stable

•MicroSize Packages

•Single, Dual, and Quad

2 Applications

•Cell Phone PA Control Loops

•Driving A/D Converters

•Video Processing

•Data Acquisition

•Process Controls

•Audio Processing

•Communications

•Active Filters

•Test Equipment

OPAx350 Harmonic Distortion

	1	G = 1
	(−40dBc)
		VO = 2.5VPP
(%)	0.1	RL = 600Ω
	(−60dBc)
Distortion
	0.01
	(−80dBc)
Harmonic
	0.001
	(−100dBc)
		3rd−Harmonic
			2nd−Harmonic
	0.0001
	(−120dBc) 1k	10k	100k	1M

Frequency (Hz)

3 Description

The OPA350 series of rail-to-rail CMOS operational amplifiers are optimized for low voltage, single-supply operation. Rail-to-rail input and output, low noise (5 nV/√Hz), and high speed operation (38 MHz, 22 V/μs) make the amplifiers ideal for driving sampling Analog- to-Digital (A/D) converters. They are also suited for cell phone PA control loops and video processing (75-Ω drive capability), as well as audio and general purpose applications. Single, dual, and quad versions have identical specifications for maximum design flexibility.

The OPA350 series operates on a single supply as low as 2.5 V, with an input common-mode voltage range that extends 300 mV below ground and 300 mV above the positive supply. Output voltage swing is to within 10 mV of the supply rails, with a 10-kΩ load. Dual and quad designs feature completely independent circuitry for lowest crosstalk and freedom from interaction.

The single (OPA350) and dual (OPA2350) come in the miniature MSOP-8 surface mount, SO-8 surface mount, and DIP-8 packages. The quad (OPA4350) packages are in the space-saving SSOP-16 surface mount and SO-14 surface mount. All are specified from −40°C to 85°C and operate from −55°C to 150°C.

Device Information(1)

	PART NUMBER	PACKAGE	BODY SIZE (NOM)
		MSOP (8)	3.00 mm × 3.00 mm
	OPA350	SOIC (8)	3.91 mm × 4.90 mm
		PDIP (8)	6.35 mm × 9.81 mm
		MSOP (8)	3.00 mm × 3.00 mm
	OPA2350	SOIC (8)	3.91 mm × 4.90 mm
		PDIP (8)	6.35 mm × 9.81 mm
	OPA4350	SSOP (16)	3.90 mm × 4.90 mm
		SOIC (14)	3.91 mm × 8.65 mm

(1)For all available packages, see the orderable addendum at the end of the data sheet.

An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications, intellectual property matters and other important disclaimers. PRODUCTION DATA.

OPA350, OPA2350, OPA4350

SBOS099D –SEPTEMBER 2000 –REVISED DECEMBER 2015 www.ti.com

Table of Contents

1	Features ..................................................................		1		7.4	Device Functional Modes........................................	17
2	Applications ...........................................................		1	8	Application and Implementation ........................		18
3	Description .............................................................		1		8.1	Application Information............................................	18
4	Revision History.....................................................		2		8.2	Typical Applications ................................................	18
5	Pin Configuration and Functions .........................		3	9	Power Supply Recommendations......................		22
6	Specifications.........................................................		4	10	Layout...................................................................		22
	6.1	Absolute Maximum Ratings	4		10.1	Layout Guidelines .................................................	22
					10.2	Layout Example	23
	6.2	ESD Ratings	4
				11 Device and Documentation Support			24
	6.3	Recommended Operating Conditions.......................	4
	6.4	Thermal Information: OPA350 and OPA2350...........	5		11.1	Device Support ....................................................	24
	6.5	Thermal Information: OPA4350 ................................	5		11.2	Documentation Support .......................................	24
	6.6	Electrical Characteristics...........................................	6		11.3	Related Links ........................................................	24
	6.7	Typical Characteristics ..............................................	8		11.4	Community Resources..........................................	25
7	Detailed Description ............................................		12		11.5	Trademarks ...........................................................	25
	7.1	Overview	12		11.6	Electrostatic Discharge Caution............................	25
					11.7	Glossary	25
	7.2	Functional Block Diagram	12
				12 Mechanical, Packaging, and Orderable
	7.3	Feature Description.................................................	12				25
					Information ...........................................................

4 Revision History

NOTE: Page numbers for previous revisions may differ from page numbers in the current version.

Changes from Revision C (January 2005) to Revision D

Page

•Added ESD Ratings table, Feature Description section, Device Functional Modes, Application and Implementation section, Power Supply Recommendations section, Layout section, Device and Documentation Support section, and

Mechanical, Packaging, and Orderable Information section. ................................................................................................

1

2

Submit Documentation Feedback

Copyright © 2000–2015, Texas Instruments Incorporated

Product Folder Links: OPA350 OPA2350 OPA4350

OPA350, OPA2350, OPA4350

www.ti.com

SBOS099D –SEPTEMBER 2000–REVISED DECEMBER 2015

5 Pin Configuration and Functions

OPA350: P, D, and DGK Packages

8-Pin PDIP, SOIC, and VSSOP

Top View

NC										NC
	1								8
−In										V+
	2								7
+In										Output
	3								6
V−										NC
	4								5

OPA2350: P, D, and DGK Packages

8-Pin PDIP, SOIC, and VSSOP

Top View

Out A	1			8	V+
−In A	2	A		7	Out B
+In A	3		B	6	−In B
−	4			5	+In B

D Package

14-Pin SOIC

Top View

Out A	1	14	Out D
−In A	2	13	−In D
	A	D
+In A	3	12	+In D
V+	4	11	V−
+In B	5	10	+In C
	B	C
−In B	6	9	−In C
Out B	7	8	Out C

DBQ Package

16-Pin SSOP

Top View

Out A	1	16	Out D
−In A	2	15	−In D
	A	D
+In A	3	14	+In D
+V	4	13	−V
+In B	5	12	+In C
	B	C
−In B	6	11	−In C
Out B	7	10	Out C
NC	8	9	NC

Pin Functions

			PIN		I/O	DESCRIPTION
NAME	OPA350	OPA2350	OPA4350 SO-14	OPA4350 SSOP
	NO.	NO.	NO.	NO.
NC	1, 5, 8	—	—	8, 9	—	No internal connection
–In	2	—	—	—	I	Inverting input
+In	3	—	—	—	I	Noninverting input
V–	4	4	11	13	I	Negative power supply
Output	6	—	—	—	O	Output
V+	7	8	4	4	I	Positive power supply
Out A	—	1	1	1	O	Output channel A
–In A	—	2	2	2	I	Inverting input channel A
+In A	—	3	3	3	I	Noninverting input channel A
+In B	—	5	5	5	I	Noninverting input channel B
–In B	—	6	6	6	I	Inverting input channel B
Out B	—	7	7	7	O	Output channel B
Out C	—	—	8	10	O	Output channel C
–In C	—	—	9	11	I	Inverting input channel C
+In C	—	—	10	12	I	Noninverting input channel C
+In D	—	—	12	14	I	Noninverting input channel D
–In D	—	—	13	15	I	Inverting input channel D
Out D	—	—	14	16	O	Output channel D
Copyright © 2000–2015, Texas Instruments Incorporated						Submit Documentation Feedback	3

Product Folder Links: OPA350 OPA2350 OPA4350

OPA350, OPA2350, OPA4350

SBOS099D –SEPTEMBER 2000 –REVISED DECEMBER 2015					www.ti.com
6	Specifications
6.1	Absolute Maximum Ratings
over operating free-air temperature range (unless otherwise noted) (1)
			MIN	MAX	UNIT
	Supply voltage			7	V
	Signal input terminals(2)	Voltage	(V−) − 0.3	(V+) + 0.3	V
		Current		10	mA
	Open short circuit current(3)		Continuous
	Operating temperature		–55	150	°C
	Lead temperature (soldering, 10 s)			300	°C
	Junction temperature			150	°C
Tstg	Storage temperature		–55	150	°C

(1)Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, which do not imply functional operation of the device at these or any other conditions beyond those indicated under Recommended Operating Conditions. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.

(2)Input terminals are diode-clamped to the power-supply rails. Input signals that can swing more than 0.3 V beyond the supply rails should be current-limited to 10 mA or less.

(3)Short-circuit to ground, one amplifier per package.

6.2	ESD Ratings
			VALUE	UNIT
OPA350, OPA2350, OPA4350 (ALL PACKAGE TYPES)
V	Electrostatic discharge	Human-body model (HBM), per ANSI/ESDA/JEDEC JS-001(1)	±1000	V
(ESD)
OPA350, OPA2350, OPA4350 (SOIC PACKAGES ONLY)
V(ESD)	Electrostatic discharge	Charged-device model (CDM), per JEDEC specification JESD22-	±1500	V
		C101(2)

(1)JEDEC document JEP155 states that 500-V HBM allows safe manufacturing with a standard ESD control process.

(2)JEDEC document JEP157 states that 250-V CDM allows safe manufacturing with a standard ESD control process.

6.3 Recommended Operating Conditions

over operating free-air temperature range (unless otherwise noted)

	MIN	NOM	MAX	UNIT
Power supply voltage, (V+)-(V-)	2.7 (±1.35)	5 (±2.5)	5.5 (±2.75)	V
Specified temperature	–40	25	85	°C
Operating temperature	–55	25	150	°C

4

Submit Documentation Feedback

Copyright © 2000–2015, Texas Instruments Incorporated

Product Folder Links: OPA350 OPA2350 OPA4350

OPA350, OPA2350, OPA4350

www.ti.com SBOS099D –SEPTEMBER 2000–REVISED DECEMBER 2015

6.4 Thermal Information: OPA350 and OPA2350

			OPA350, OPA2350
	THERMAL METRIC(1)	DGK (VSSOP)	P (PDIP)	D (SOIC)	UNIT
		8 PINS	8 PINS	8 PINS
RθJA	Junction-to-ambient thermal resistance	169.2	53.1	140.1	°C/W
RθJC(top)	Junction-to-case (top) thermal resistance	62.8	42.5	89.8	°C/W
RθJB	Junction-to-board thermal resistance	89.8	30.3	80.6	°C/W
ψJT	Junction-to-top characterization parameter	7.5	19.7	28.7	°C/W
ψJB	Junction-to-board characterization parameter	88.2	30.2	80.1	°C/W
RθJC(bot)	Junction-to-case (bottom) thermal resistance	N/A	N/A	N/A	°C/W

(1)For more information about traditional and new thermal metrics, see the IC Package Thermal Metrics application report, SPRA953.

6.5 Thermal Information: OPA4350

		OPA4350
	THERMAL METRIC(1)	D (SOIC)	DBQ (SSOP)	UNIT
		14 PINS	16 PINS
RθJA	Junction-to-ambient thermal resistance	83.8	115.8	°C/W
RθJC(top)	Junction-to-case (top) thermal resistance	70.7	67	°C/W
RθJB	Junction-to-board thermal resistance	59.5	58.3	°C/W
ψJT	Junction-to-top characterization parameter	11.6	19.9	°C/W
ψJB	Junction-to-board characterization parameter	37.7	57.9	°C/W
RθJC(bot)	Junction-to-case (bottom) thermal resistance	N/A	N/A	°C/W

(1)For more information about traditional and new thermal metrics, see the Semiconductor and IC Package Thermal Metrics application report, SPRA953.

Copyright © 2000–2015, Texas Instruments Incorporated

Submit Documentation Feedback

5

Product Folder Links: OPA350 OPA2350 OPA4350

OPA350, OPA2350, OPA4350

SBOS099D –SEPTEMBER 2000 –REVISED DECEMBER 2015

www.ti.com

6.6 Electrical Characteristics

VS = 2.7 V to 5.5 V; All specifications at TA = 25°C, RL = 1 kΩ connected to VS/2 and VOUT = VS/2, unless otherwise noted.

	PARAMETER		TEST CONDITIONS	MIN	TYP(1)	MAX	UNIT
OFFSET VOLTAGE
			VS = 5 V		±150	±500	µV
VOS	Input offset voltage	TA = −40°C to				±1	mV
		85°C
		vs Temperature	TA = –40°C to 85°C		±4		μV/°C
PSRR	vs Power-supply		VS = 2.7 V to 5.5 V, VCM = 0 V		40	150	µV/V
	rejection ratio					175
	Channel separation (dual, quad)		DC		0.15		µV/V
INPUT BIAS CURRENT
IB	Input bias current				±0.5	±10	pA
		vs Temperature		See Typical Characteristics
IOS	Input offset current				±0.5	±10	pA
NOISE
	Input voltage noise, f = 100 Hz to 400 kHz				4		μVrms
en	Input voltage noise density, f = 10 kHz				7		nV/√Hz
	Input current noise density, f = 100 kHz				5		nV/√Hz
in	Current noise density, f = 10 kHz				4		fA/√Hz
INPUT VOLTAGE RANGE
VCM	Common-mode voltage range		TA = −40°C to 85°C	–0.1		(V+) + 0.1	V
			VS = 2.7 V, −0.1 V < VCM < 2.8 V	66	84
CMRR	Common-mode rejection ratio		VS = 5.5 V, −0.1 V < VCM < 5.6 V	74	90		dB
			TA = −40°C to 85°C,	74
			VS = 5.5 V, −0.1 V < VCM < 5.6 V
INPUT IMPEDANCE
	Differential				1013 || 2.5		Ω || pF
	Common-mode				1013 || 6.5		Ω || pF
OPEN-LOOP GAIN
			RL = 10 kΩ, 50 mV < VO < (V+) –50 mV	100	122
AOL	Open-loop voltage	TA = –40°C to	RL = 10 kΩ, 50 mV < VO < (V+) –50 mV	100			dB
	gain		RL = 1 kΩ, 200 mV < VO < (V+) –200 mV	100	120
		85°C
			RL = 1 kΩ, 200 mV < VO < (V+) –200 mV	100
FREQUENCY RESPONSE (CL = 100 pF)
GBW	Gain-bandwidth product		G = 1		38		MHz
SR	Slew rate		G = 1		22		V/µs
	Settling time	0.1%	G = ±1, 2-V Step		0.22		µs
		0.01%			0.5
	Overload recovery time		VIN × G = VS		0.1		µs
THD+N	Total harmonic distortion + noise		RL = 600 Ω, VO = 2.5 VPP(2), G = 1, f = 1 kHz		0.0006%
	Differential gain error		G = 2, RL = 600 Ω, VO = 1.4 V(3)		0.17%
	Differential phase error		G = 2, RL = 600 Ω, VO = 1.4 V(3)		0.17		°
OUTPUT
	Voltage output swing		RL = 10 kΩ, AOL ≥ 100 dB		10	50
VOUT		TA = –40°C to	RL = 10 kΩ, AOL ≥ 100 dB			50	mV
	from rail(4)
		85°C	RL = 1 kΩ, AOL ≥ 100 dB		25	200
IOUT	Output current				±40(5)		mA
ISC	short circuit current				±80		mA
CLOAD	Capacitive load drive			See Typical Characteristics

(1)VS = 5 V

(2)VOUT = 0.25 V to 2.75 V

(3)NTSC signal generator used. See Figure 31 for test circuit.

(4)Output voltage swings are measured between the output and power supply rails.

(5)See Figure 17.

6

Submit Documentation Feedback

Copyright © 2000–2015, Texas Instruments Incorporated

Product Folder Links: OPA350 OPA2350 OPA4350

OPA350, OPA2350, OPA4350

www.ti.com

SBOS099D –SEPTEMBER 2000–REVISED DECEMBER 2015

Electrical Characteristics (continued)

VS = 2.7 V to 5.5 V; All specifications at TA = 25°C, RL = 1 kΩ connected to VS/2 and VOUT = VS/2, unless otherwise noted.

	PARAMETER				TEST CONDITIONS	MIN	TYP(1)	MAX	UNIT
POWER SUPPLY
VS	Operating voltage range				TA = −40°C to 85°C	2.7		5.5	V
	Minimum operating voltage						2.5		V
	Quiescent current						5.2	7.5
IQ					IO = 0				mA
			TA	= –40°C to
	(per amplifier)							8.5
			85°C
TEMPERATURE RANGE
	Specified range					–40		85	°C
	Operating range					–55		150	°C

Copyright © 2000–2015, Texas Instruments Incorporated

Submit Documentation Feedback

7

Product Folder Links: OPA350 OPA2350 OPA4350

OPA350, OPA2350, OPA4350

SBOS099D –SEPTEMBER 2000 –REVISED DECEMBER 2015

www.ti.com

6.7 Typical Characteristics

All specifications at TA = 25°C, VS = 5 V, and RL = 1 kΩ connected to VS/2, unless otherwise noted.

	160									0			100
	140												90				PSRR
													80
(dB)GainVoltage	120									−45
											)(Phase	(dB)CMRRPSRR,	30
	100												70
																CMRR
							φ						60
	80									−90						(VS = +5V
													50
															VCM	= −0.1V to 5.1V)
	60
													40
							G
	40									−135
	20												20
	0									−180			10
	0.1	1	10	100	1k	10k	100k	1M	10M	100M			0
					Frequency (Hz)								10	100	1k	10k	100k	1M	10M
																Frequency (Hz)
	Figure 1. Open-Loop Gain and Phase vs Frequency											Figure 2. Power Supply and Common-Mode Rejection Ratio
																vs Frequency
	100k									10k			140
													130
(nVNoise√Hz)	10k					Current Noise				1k		Separation(dB)	120
											√ Hz)
	1k									100	(fANoise		110
			Voltage Noise										100
	100									10
Voltage											Current	Channel	90
	10									1
													80
													70	Dual and quad devices.
	1									0.1			60
	10		100	1k		10k	100k	1M		10M
													10	100	1k	10k	100k	1M	10M
					Frequency (Hz)											Frequency (Hz)

Figure 3. Input Voltage and Current Noise Spectral Density	Figure 4. Channel Separation vs Frequency

vs Frequency

1						1	G = 1
			RL = 600Ω			(−40dBc)
							VO = 2.5VPP
0.1	G = 100, 3VPP (VO = 1V to 4V)				(%)	0.1	RL = 600Ω
THD+N(%)					DistortionHarmonic	(−60dBc)
	G = 10, 3VPP (VO = 1V to 4V)					0.01
0.01
						(−80dBc)
	G = 1, 3VPP (VO = 1V to 4V)
0.001	Input goes through transition region					0.001
	G = 1, 2.5VPP (VO = 0.25V to 2.75V)					(−100dBc)	3rd−Harmonic
								2nd−Harmonic
	Input does NOT go through transition region
0.0001						0.0001
10	100	1k	10k	100k		(−120dBc) 1k	10k	100k	1M

	Frequency (Hz)	Frequency (Hz)
	Figure 5. Total Harmonic Distortion + Noise vs Frequency	Figure 6. Harmonic Distortion + Noise vs Frequency
8	Submit Documentation Feedback	Copyright © 2000–2015, Texas Instruments Incorporated
	Product Folder Links: OPA350 OPA2350 OPA4350

OPA350, OPA2350, OPA4350

www.ti.com

SBOS099D –SEPTEMBER 2000–REVISED DECEMBER 2015

Typical Characteristics (continued)

All specifications at TA = 25°C, VS = 5 V, and RL = 1 kΩ connected to VS/2, unless otherwise noted.
	0.5													130
						G = 2
	0.4			Phase		VO = 1.4V
						NTSC Signal Generator							Open−LoopGain(dB)	125		R		= 10kΩ		RL = 1kΩ
						See Figure 6 for test circuit.											L
	0.3
														120
	0.2		Gain
DifferentialGain(%)	PhaseDifferential(°)																			RL = 600Ω
														115
	0.1
	0													110
	0	100	200	300	400	500	600	700	800	900	1000			−75	−50	−25		0	25	50	75	100	125
					Resistive Load ( Ω )													Temperature ( °C)
	Figure 7. Differential Gain and Phase vs Resistive Load														Figure 8. Open-Loop Gain vs Temperature
100											110			40
				CMRR, VS = 5.5V										35
				(VCM = −0.1V to +5.6V)
	90										100		SlewRate (V/µs)	30	Negative Slew Rate
CMRR(dB)												PSRR(dB)		25
																				Positive Slew Rate
	80				CMRR, VS = 2.7V						90			20
				(VCM =− 0.1V to +2.8V)										15
			PSRR
	70										80			10
														5
	60										70			0
	−75	−50	−25	0	25	50		75	100	125				−75	−50	−25		0	25	50	75	100	125
				Temperature ( °C)														Temperature ( °C)
	Figure 9. Common-Mode and Power-Supply Rejection Ratio														Figure 10. Slew Rate vs Temperature
				vs Temperature
	7.0										100			6.0
						+ISC									Per Amplifier
	6.5										90	Short−CircuitCurrent(mA)		5.5
QuiescentCurrent(mA)	6.0			−ISC							80		QuiescentCurrent(mA)	5.0
	5.5										70
						IQ								4.5
	5.0										60
	4.5										50			4.0
	4.0										40			3.5
	3.5										30			3.0
	−75	−50	−25	0	25	50		75	100	125				2.0	2.5	3.0		3.5		4.0	4.5	5.0	5.5
				Temperature ( °C)														Supply Voltage (V)
	Figure 11. Quiescent Current and short circuit Current vs													Figure 12. Quiescent Current vs Supply Voltage
					Temperature

Copyright © 2000–2015, Texas Instruments Incorporated

Submit Documentation Feedback

9

Product Folder Links: OPA350 OPA2350 OPA4350

OPA350, OPA2350, OPA4350

SBOS099D –SEPTEMBER 2000 –REVISED DECEMBER 2015

www.ti.com

Typical Characteristics (continued)

All specifications at TA = 25°C, VS = 5 V, and RL = 1 kΩ connected to VS/2, unless otherwise noted.

Current (pA)	1k
	100
	10
Bias
Input	1
	0.1
	−75		−50		−25		0		25		50		75		100		125

Temperature (°C)

Figure 13. Input Bias Current vs Temperature

	100
(Ω)	10
	1
Impedance
	0.1			G = 100
Output
	0.01					G	=	10
	0.001					G = 1
	0.0001
																																					100M
	1			10							100						1k				10k				100k					1M			10M
																		Frequency (Hz)

Figure 15. Closed-Loop Output Impedance vs Frequency

Output Voltage (V)

V+

(V+)−1

(V+)−2

(V−)+2

(V−)+1

(V−)

0

−55°C

+25°C

+125°C

Depending on circuit configuration

(including closed−loop gain) performance

may be degraded in shaded region.

+125°C

+25°C

−55 °C

±10

±20

±30

±40

Output Current (mA)

Figure 17. Output Voltage Swing vs Output Current

Current(pA)	1.5
	1.0
	0.5
Bias
Input	0.0
	−0.5
	−0.5		0.0		0.5		1.0		1.5		2.0		2.5		3.0		3.5		4.0		4.5		5.0		5.5
								Common−Mode Voltage (V)

Figure 14. Input Bias Current vs Input Common-Mode Voltage

6

VS

= 5.5V

Maximum output

5

voltage without

)

slew rate−induced

PP

distortion.

(V

4

Voltage

3

VS

= 2.7V

Output

2

1

0

100k

1M

10M

100M

Frequency (Hz)

Figure 16. Maximum Output Voltage vs Frequency

	140
	130	IOUT = 250µA			IOUT = 2.5mA
(dB)	120
Gain	110
	100			IOUT = 4.2mA
Open−Loop
	90
	80
	70
	60
	0	20	40	60	80	100	120	140	160	180	200
			Output Voltage Swing from Rails (mV)

Figure 18. Open-Loop Gain vs Output Voltage Swing

10

Submit Documentation Feedback

Copyright © 2000–2015, Texas Instruments Incorporated

Product Folder Links: OPA350 OPA2350 OPA4350

OPA350, OPA2350, OPA4350

www.ti.com

SBOS099D –SEPTEMBER 2000–REVISED DECEMBER 2015

Typical Characteristics (continued)
All specifications at TA = 25°C, VS = 5 V, and RL = 1 kΩ connected to VS/2, unless otherwise noted.
	18			Typical distribution of			20								Typical production
	16						18
				packaged units.											distribution of
AmplifiersofPercent(%)	14					AmplifiersofPercent(%)	16								packaged units.
	12						14
	10						12
	8						10
	6						8
	4						6
	2						4
	0						2
	− 500 −450	−400 −350 − 300 −250 −200 −150 −100 −50	0 50	100 150 200 250 300 350 400 450	500		0
							0	1	2 3	4 5	6	7	8	9	10 11 12 13 14 15

Offset Voltage (µV)

Offset Voltage Drift (µV/ °C)

Figure 19. Offset Voltage Production Distribution

Figure 20. Offset Voltage Drift Production Distribution

	80							10
	70
			G = 1
	60						Settling Time(µs)		0.01%
Overshoot(%)
	50
		G= −1
	40							1
	30
				G = ±10
	20
	10								0.1%
	0							0.1
	10	100	1k	10k	100k	1M		−1	−10	−100
			Load Capacitance (pF)						Closed−Loop Gain (V/V)

Figure 21. Small-Signal Overshoot vs Load Capacitance

Figure 22. Settling Time vs Closed-Loop Gain

50mV/div		1V/div

100ns/div

200ns/div

Figure 23. Small-Signal Step Response	Figure 24. Large-Signal Step Response
CL = 100 pF	CL = 100 pF

Copyright © 2000–2015, Texas Instruments Incorporated

Submit Documentation Feedback

11

Product Folder Links: OPA350 OPA2350 OPA4350

OPA350, OPA2350, OPA4350

SBOS099D –SEPTEMBER 2000 –REVISED DECEMBER 2015

www.ti.com

7 Detailed Description

7.1 Overview

The OPA350 series rail-to-rail CMOS operational amplifiers are optimized for low voltage, single-supply operation. Rail-to-rail input and output, low noise (5 nV/√Hz), and high speed operation (38 MHz, 22 V/μs) make the amplifiers ideal for driving sampling Analog-to-Digital (A/D) converters. They are also suited for cell phone PA control loops and video processing (75-Ω drive capability), as well as audio and general purpose applications. Single, dual, and quad versions have identical specifications for maximum design flexibility.

7.2 Functional Block Diagram

V+
	Reference
	Current
VIN+	VIN−
	VBIAS1	Class AB
		Control	VO
		Circuitry
	VBIAS2
V−
(Ground)

7.3 Feature Description

The OPA350 series of operational amplifiers (op amps) are fabricated on a state-of-the-art 0.6 micron CMOS process. They are unity-gain stable and suitable for a wide range of general purpose applications. Rail-to-rail input and output make them ideal for driving sampling A/D converters. They are also suited for controlling the output power in cell phones. These applications often require high speed and low noise. In addition, the OPA350 series offers a low-cost solution for general-purpose and consumer video applications (75-Ω drive capability).

Excellent AC performance makes the OPA350 series suited for audio applications. Their bandwidth, slew rate, low noise (5 nV/√Hz), low THD (0.0006%), and small package options are ideal for these applications. The class AB output stage is capable of driving 600-Ω loads connected to any point between V+ and ground.

Rail-to-rail input and output swing significantly increases dynamic range, especially in low voltage supply applications. Figure 25 shows the input and output waveforms for the OPA350 in unity-gain configuration. Operation is from a single 5-V supply with a 1-kΩ load connected to VS/2. The input is a 5 VPP sinusoid. Output voltage swing is approximately 4.95 VPP.

Power supply pins should be bypassed with 0.01-μF ceramic capacitors.

12

Submit Documentation Feedback

Copyright © 2000–2015, Texas Instruments Incorporated

Product Folder Links: OPA350 OPA2350 OPA4350

www.ti.com

Feature Description (continued)

5V

VIN

0

5V

VOUT

0

OPA350, OPA2350, OPA4350

SBOS099D –SEPTEMBER 2000–REVISED DECEMBER 2015

VS = +5, G = +1, RL = 1kΩ

1.25V/div

Figure 25. Rail-to-Rail Input and Output

7.3.1 Operating Voltage

OPA350 series operational amplifiers are fully specified from 2.7 V to 5.5 V. Supply voltage may range from 2.5 V to 5.5 V. Parameters are tested over the specified supply range: a feature of the OPA350 series. In addition, many specifications apply from −40°C to 85°C. Most behavior remains virtually unchanged throughout the full operating voltage range. Parameters that vary significantly with operating voltage or temperature are shown in

Typical Characteristics.

7.3.2 Rail-to-Rail Input

The tested input common-mode voltage range of the OPA350 series extends 100 mV beyond the supply rails. This is achieved with a complementary input stage: an N-channel input-differential pair in parallel with a P- channel differential pair, as shown in Figure 26. The N-channel pair is active for input voltages close to the positive rail, typically (V+) – 1.8 V to 100 mV above the positive supply, while the P-channel pair is on for inputs from 100 mV below the negative supply to approximately (V+) – 1.8 V. There is a small transition region, typically (V+) – 2 V to (V+) – 1.6 V, in which both pairs are on. This 400-mV transition region can vary ±400 mV with process variation. Thus, the transition region (both input stages on) can range from (V+) – 2.4 V to (V+) – 2 V on the low end, up to (V+) – 1.6 V to (V+) – 1.2 V on the high end.

Copyright © 2000–2015, Texas Instruments Incorporated

Submit Documentation Feedback

13

Product Folder Links: OPA350 OPA2350 OPA4350