Datasheet
LF412-N
www.ti.com
SNOSBH7E –APRIL 1999–REVISED MARCH 2013
DC Electrical Characteristics
Symbol Parameter Conditions LF412A
(1)
LF412
(1)
Units
Min Typ Max Min Typ Max
V
OS
Input Offset Voltage R
S
=10 kΩ, T
A
=25°C 0.5 1.0 1.0 3.0 mV
ΔV
OS
/ΔT Average TC of Input R
S
=10 kΩ
(2)
7 10 7 20 μV/°C
Offset Voltage
I
OS
Input Offset Current V
S
=±15V
(1) (3)
T
j
=25°C 25 100 25 100 pA
T
j
=70°C 2 2 nA
T
j
=125°C 25 25 nA
I
B
Input Bias Current V
S
=±15V
(1) (3)
T
j
=25°C 50 200 50 200 pA
T
j
=70°C 4 4 nA
T
j
=125°C 50 50 nA
R
IN
Input Resistance T
j
=25°C 10
12
10
12
Ω
A
VOL
Large Signal Voltage R
L
=2k, T
A
=25°C
50 200 25 200 V/mV
Gain
V
S
=±15V, V
O
=±10V,
Over Temperature 25 200 15 200 V/mV
V
O
Output Voltage Swing V
S
=±15V, R
L
=10k ±12 ±13.5 ±12 ±13.5 V
V
CM
Input Common-Mode ±16 +19.5 ±11 +14.5 V
Voltage Range
−16.5 −11.5 V
CMRR Common-Mode Rejection R
S
≤10k
80 100 70 100 dB
Ratio
PSRR Supply Voltage Rejection
(4)
80 100 70 100 dB
Ratio
I
S
Supply Current V
O
= 0V, R
L
= ∞ 3.6 5.6 3.6 6.5 mA
(1) Unless otherwise specified, the specifications apply over the full temperature range and for V
S
=±20V for the LF412A and for V
S
=±15V
for the LF412. V
OS
, I
B
, and I
OS
are measured at V
CM
=0.
(2) The LF412A is 100% tested to this specification. The LF412 is sample tested on a per amplifier basis to insure at least 85% of the
amplifiers meet this specification.
(3) The input bias currents are junction leakage currents which approximately double for every 10°C increase in the junction temperature,
T
j
. Due to limited production test time, the input bias currents measured are correlated to junction temperature. In normal operation the
junction temperature rises above the ambient temperature as a result of internal power dissipation, P
D
. T
j
=T
A
+θ
jA
P
D
where θ
jA
is the
thermal resistance from junction to ambient. Use of a heat sink is recommended if input bias current is to be kept to a minimum.
(4) Supply voltage rejection ratio is measured for both supply magnitudes increasing or decreasing simultaneously in accordance with
common practice. V
S
= ±6V to ±15V.
AC Electrical Characteristics
LF412A
(1)
LF412
(1)
Symbol Parameter Conditions Units
Min Typ Max Min Typ Max
Amplifier to Amplifier T
A
=25°C, f=1 Hz-20 kHz
−120 −120 dB
Coupling (Input Referred)
SR Slew Rate V
S
=±15V, T
A
=25°C 10 15 8 15 V/μs
GBW Gain-Bandwidth Product V
S
=±15V, T
A
=25°C 3 4 2.7 4 MHz
THD Total Harmonic Dist A
V
=+10, R
L
=10k, ≤0.02 ≤0.02 %
V
O
=20 Vp-p,
BW=20 Hz-20 kHz
e
n
Equivalent Input Noise T
A
=25°C, R
S
=100Ω,
25 25 nV / √Hz
Voltage f=1 kHz
i
n
Equivalent Input Noise T
A
=25°C,
0.01 0.01 pA / √Hz
Current f=1 kHz
(1) Unless otherwise specified, the specifications apply over the full temperature range and for V
S
=±20V for the LF412A and for V
S
=±15V
for the LF412. V
OS
, I
B
, and I
OS
are measured at V
CM
=0.
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