LF412C

DUAL JFET INPUT OPERATIONAL AMPLIFIER

SLOS010B − MARCH 1987 − REVISED AUGUST 1994

2

POST OFFICE BOX 655303

• DALLAS, TEXAS 75265

POST OFFICE BOX 1443

• HOUSTON, TEXAS 77251−1443

recommended operating conditions

MIN

MAX

UNIT

Supply voltage, VCC +

3.5

18

V

Supply voltage, VCC −

− 3.5

−18

V

electrical characteristics over operating free-air temperature range, VCC± =±15 V (unless otherwise

specified)

PARAMETER

TEST CONDITIONS

TA†

MIN

TYP

MAX

UNIT

VIO

Input offset voltage

VIC = 0,

RS = 10 kΩ

25

°C

1

3

mV

αVIO

Average temperature coefficient of input offset

voltage

VIC = 0,

RS = 10 kΩ

10

20‡

µV/°C

IIO

Input offset current§

VIC = 0

25

°C

25

100

pA

IIO

Input offset current§

VIC = 0

70

°C

4

nA

IIB

Input bias current§

VIC = 0

25

°C

50

200

pA

IIB

Input bias current§

VIC = 0

70

°C

8

nA

VICR

Common-mode input voltage range

±11

− 11.5

to

14.5

V

VOM

Maximum peak output voltage swing

RL = 10 kΩ

±12 ±13.5

V

AVD

Large-signal differential voltage

VO = ± 10 V, RL = 2 kΩ

25

°C

25

200

V/mV

AVD

Large-signal differential voltage

VO = ± 10 V, RL = 2 kΩ

Full range

15

200

V/mV

ri

Input resistance

TA = 25°C

1012

Ω

CMRR

Common-mode rejection ratio

RS ≤ 10 kΩ

70

100

dB

kSVR

Supply-voltage rejection ratio

See Note 2

70

100

dB

ICC

Supply current

4.5

6.8

mA

† Full range is 0°C to 70°C.

‡ At least 90% of the devices meet this limit for αVIO.

§ 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, VCC± = ±15 V, TA = 25°C

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

VO1/VO2

Crosstalk attenuation

f = 1 kHz

120

dB

SR

Slew rate

8

13

V/

µs

B1

Unity-gain bandwidth

2.7

3

MHz

Vn

Equivalent input noise voltage

f = 1 kHz,

RS = 20 Ω

18

nV/

√Hz

In

Equivalent input noise current

f = 1 kHz

0.01

pA/

√Hz