ST LF147, LF247, LF347 Operation Manual

LF147 - LF247

LF347

WIDE BANDWIDTH QUAD J-FET OPERATIONAL AMPLIFIERS

■LOW POWER CONSUMPTION

■WIDE COMMON-MODE (UP TO VCC+) AND DIFFERENTIAL VOLTAGE RANGE

■LOW INPUT BIAS AND OFFSET CURRENT

■OUTPUT SHORT-CIRCUIT PROTECTION

■HIGH INPUT IMPEDANCE J–FET INPUT STAGE

■INTERNAL FREQUENCY COMPENSATION

■LATCH UP FREE OPERATION

■HIGH SLEW RATE : 16V/μs (typ)

N

DIP14

(Plastic Package)

D

SO14

(Plastic Micropackage)

DESCRIPTION

These circuits are high speed J–FET input quad operational amplifiers incorporating well matched, high voltage J–FET and bipolar transistors in a monolithic integrated circuit.

The devices feature high slew rates, low input bias and offset currents, and low offset voltage temperature coefficient.

PIN CONNECTIONS (top view)

ORDER CODE

	Part Number	Temperature Range	Package
			N	D
	LF147	-55°C, +125°C	∙	∙
	LF247	-40°C, +105°C	∙	∙
	LF347	0°C, +70°C	∙	∙

Example : LF347IN

N = Dual in Line Package (DIP)

D = Small Outline Package (SO) - also available in Tape & Reel (DT)

Output 1	1			14	Output 4
Inverting Input 1	2	-	-	13	Inverting Input 4
Non-inverting Input 1	3	+	+	12	Non-inverting Input 4
VCC +	4			11	VCC -
Non-inverting Input 2	5	+	+	10	Non-inverting Input 3
Inverting Input 2	6	-	-	9	Inverting Input 3
Output 2	7			8	Output 3

March 2001

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LF147 - LF247 - LF347

SCHEMATIC DIAGRAM (each amplifier)

VCC

Non-inverting input

Inverting input

100 200

Output

100

30k

100

8.2k

1.3k

1.3k

35k

35k

VCC

ABSOLUTE MAXIMUM RATINGS

Symbol

Parameter

LF147

LF247

LF347

Unit

VCC

Supply voltage - note 1)

±18

V

Vi

Input Voltage - note 2)

±15

V

Vid

Differential Input Voltage - note 3)

±30

V

Ptot

Power Dissipation

680

mW

Output Short-circuit Duration - note 4)

Infinite

Toper

Operating Free-air Temperature Range

-55 to +125

-40 to +105

0 to +70

°C

Tstg

Storage Temperature Range

-65 to +150

°C

1.All voltage values, except differential voltage, are with respect to the zero reference level (ground) of the supply voltages where the zero reference level is the midpoint between VCC+ and VCC-.

2.The magnitude of the input voltage must never exceed the magnitude of the supply voltage or 15 volts, whichever is less.

3.Differential voltages are the non-inverting input terminal with respect to the inverting input terminal.

4.The output may be shorted to ground or to either supply. Temperature and/or supply voltages must be limited to ensure that the dissipation rating is not exceeded

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LF147 - LF247 - LF347

ELECTRICAL CHARACTERISTICS

VCC = ±15V, Tamb = +25°C (unless otherwise specified)

Symbol			Parameter	Min.	Typ.	Max.	Unit
	Input Offset Voltage (Rs = 10kΩ)						mV
Vio	Tamb = 25°C				3	10
	Tmin ≤ Tamb	≤ Tmax				13
DVio	Input Offset Voltage Drift				10		μV/°C
Iio	Input Offset Current - note 1)
	Tamb = 25°C				5	100	pA
	Tmin ≤ Tamb	≤ Tmax				4	nA
	Input Bias Current	- note 1
Iib	Tamb = 25°C				20	200	pA
	Tmin ≤ Tamb	≤ Tmax				20	nA
	Large Signal Voltage Gain		(RL = 2kΩ, Vo = ±10V) ,				V/mV
Avd	Tamb = 25°C			50	200
	Tmin ≤ Tamb	≤ Tmax		25
	Supply Voltage Rejection Ratio (RS = 10kΩ)						dB
SVR	Tamb = 25°C			80	86
	Tmin ≤ Tamb	≤ Tmax		80
	Supply Current, Per Amp, no Load						mA
ICC	Tamb = 25°C				1.4	2.7
	Tmin ≤ Tamb	≤ Tmax				2.7
Vicm	Input Common Mode Voltage Range			±11	+15		V
					-12
	Common Mode Rejection Ratio (RS = 10kΩ)						dB
CMR	Tamb = 25°C			70	86
	Tmin ≤ Tamb	≤ Tmax		70
	Output Short-Circuit Current						mA
IOS	Tamb = 25°C			10	40	60
	Tmin ≤ Tamb	≤ Tmax		10		60
	Output Voltage Swing		R L = 2kΩ				V
	Tamb = 25°C			10	12
±Vopp			RL = 10kΩ	12	13.5
	Tmin ≤ Tamb	≤ Tmax	RL = 2kΩ	10
			RL = 10kΩ	12
SR	Slew Rate						V/μs
	Vi = 10V, RL = 2kΩ, CL = 100pF, Tamb = 25°C, unity gain			12	16
tr	Rise Time						μs
	Vi = 20mV, RL = 2kΩ,CL = 100pF, Tamb = 25°C, unity gain				0.1
Kov	Overshoot						%
	Vi = 20mV, RL = 2kΩ, CL = 100pF, Tamb = 25°C, unity gain				10
GBP	Gain Bandwidth Product						MHz
	f =100kHz, Tamb = 25°C, V in = 10mV, RL =2kΩ, CL = 100pF			2.5	4
Ri	Input Resistance				1012		Ω
	Total Harmonic Distortion						%
THD	f =1kHz, Av = 20dB, RL = 2kΩ, CL = 100pF
	Tamb = 25°C, V O = 2Vpp				0.01
en	Equivalent Input Noise Voltage (RS = 100Ω, f = 1KHz)				15		nV
							-----------
							Hz
m	Phase Margin				45		Degrees
Vo1/Vo2	Channel Separation ( Av = 100)				120		dB

1.The input bias currents are junction leakage currents which approximately double for every 10°C increase in the junction temper ature.

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