LF347, LF347B
JFET-INPUT
QUAD OPERATIONAL AMPLIFIERS
SLOS013B – MARCH 1987 – REVISED AUGUST 1994
1
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
D
Low Input Bias Current...50 pA Typ
D
Low Input Noise Current
0.01 pA/√Hz
Typ
D
Low Total Harmonic Distortion
D
Low Supply Current... 8 mA Typ
D
Gain Bandwidth...3 MHz Typ
D
High Slew Rate...13 V/µs Typ
D
Pin Compatible With the LM348
description
These devices are low-cost, high-speed, JFET-input operational amplifiers. They require low supply current yet
maintain a large gain-bandwidth product and a fast slew rate. In addition, their matched high-voltage JFET
inputs provide very low input bias and offset current.
The LF347 and LF347B can be used in applications such as high-speed integrators, digital-to-analog
converters, sample-and-hold circuits, and many other circuits.
The LF347 and LF347B are characterized for operation from 0°C to 70°C.
symbol (each amplifier)
–
+
IN –
IN +
OUT
AVAILABLE OPTIONS
PACKAGE
T
A
VIOmax
AT 25°C
SMALL OUTLINE
(D)
PLASTIC DIP
(N)
°
°
10 mV LF347D LF347N
0°C to 70°C
5 mV LF347BD LF347BN
The D packages are available taped and reeled. Add R suffix to the device
type (e.g., LF347DR).
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
Supply voltage, V
CC +
18 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Supply voltage
,
V
CC –
–18 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Differential input voltage, V
ID
±30 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input voltage, V
I
(see Note 1) ±15 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Duration of output short circuit unlimited. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Continuous total power dissipation See Dissipation Rating Table. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating temperature range 0°C to 70°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Storage temperature range –65°C to 150°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds 260°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
NOTE 1: Unless otherwise specified, the absolute maximum negative input voltage is equal to the negative power supply voltage.
Copyright 1994, Texas Instruments Incorporated
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
1
2
3
4
5
6
7
14
13
12
11
10
9
8
1OUT
1IN –
1IN+
V
CC+
2IN+
2IN–
2OUT
4OUT
4IN–
4IN +
V
CC –
3IN+
3IN–
3OUT
D OR N PACKAGE
(TOP VIEW)
LF347, LF347B
JFET-INPUT
QUAD OPERATIONAL AMPLIFIERS
SLOS013B – MARCH 1987 – REVISED AUGUST 1994
2
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
DISSIPATION RATING TABLE
PACKAGE
TA ≤ 25°C
POWER RATING
DERATING
FACTOR
DERATE
ABOVE T
A
TA = 70°C
POWER RATING
D
N
608 mW
680 mW
7.6 mW/°C
N/A
61°C
N/A
608 mW
680 mW
recommended operating conditions
MIN MAX
UNIT
Supply voltage, V
CC +
3.5 18 V
Supply voltage, V
CC –
–3.5 –18 V
electrical characteristics over operating free-air temperature range, V
CC±
= ±15 V (unless
otherwise specified)
TEST
LF347 LF347B
PARAMETER
CONDITIONS
T
A
†
MIN TYP MAX MIN TYP MAX
UNIT
p
V
= 0,
25°C 5 10 3 5
VIOInput offset voltage
IC
,
RS = 10 kΩ
Full range 13 7
mV
α
VIO
Average temperature coefficient of
input offset voltage
VIC = 0,
RS = 10 kΩ
18 18 µV/°C
25°C 25 100 25 100 pA
I
IO
I
nput offset current
‡
V
IC
=
0
70°C 4 4 nA
25°C 50 200 50 200 pA
I
IB
I
nput bias current
‡
V
IC
=
0
70°C 8 8 nA
V
ICR
Common-mode input voltage range ±11
–12
to
15
±11
–12
to
15
V
V
OM
Maximum peak output voltage swing RL = 10 kΩ ±12 ±13.5 ±12 ±13.5 V
V
= ±10 V,
25°C 25 100 50 100
AVDLarge-signal differential voltage
O
,
RL = 2 kΩ
Full range 15 25
V/mV
r
i
Input resistance TA = 25°C 10
12
10
12
Ω
CMRR Common-mode rejection ratio RS ≤ 2 kΩ 70 100 80 100 dB
k
SVR
Supply-voltage rejection ratio See Note 2 70 100 80 100 dB
I
CC
Supply current 8 11 8 11 mA
†
Full range is 0°C to 70°C.
‡
Input bias currents of a FET-input operational amplifier are normal junction reverse currents, which are temperature sensitive. Pulse techniques
must be used that will maintain the junction temperatures as close to the ambient temperature as possible.
NOTE 2: Supply-voltage rejection ratio is measured for both supply magnitudes increasing or decreasing simultaneously.
operating characteristics, V
CC±
= ±15 V
PARAMETER TEST CONDITIONS MIN TYP MAX
UNIT
VO1/V
O2
Crosstalk attentuation f = 1 kHz 120 dB
SR Slew rate 8 13 V/µs
B
1
Unity-gain bandwidth 3 MHz
V
n
Equivalent input noise voltage f = 1 kHz, RS = 20 Ω 18 nV/√Hz
I
n
Equivalent input noise current f = 1 kHz 0.01 pA/√Hz
IMPORTANT NOTICE
T exas Instruments and its subsidiaries (TI) reserve the right to make changes to their products or to discontinue
any product or service without notice, and advise customers to obtain the latest version of relevant information
to verify, before placing orders, that information being relied on is current and complete. All products are sold
subject to the terms and conditions of sale supplied at the time of order acknowledgement, including those
pertaining to warranty, patent infringement, and limitation of liability.
TI warrants performance of its semiconductor products to the specifications applicable at the time of sale in
accordance with TI’s standard warranty. Testing and other quality control techniques are utilized to the extent
TI deems necessary to support this warranty. Specific testing of all parameters of each device is not necessarily
performed, except those mandated by government requirements.
CERT AIN APPLICATIONS USING SEMICONDUCTOR PRODUCTS MAY INVOLVE POTENTIAL RISKS OF
DEATH, PERSONAL INJURY, OR SEVERE PROPERTY OR ENVIRONMENTAL DAMAGE (“CRITICAL
APPLICATIONS”). TI SEMICONDUCTOR PRODUCTS ARE NOT DESIGNED, AUTHORIZED, OR
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BE FULLY AT THE CUSTOMER’S RISK.
In order to minimize risks associated with the customer’s applications, adequate design and operating
safeguards must be provided by the customer to minimize inherent or procedural hazards.
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Copyright 1998, Texas Instruments Incorporated
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