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LT1218

Precision Rail-to-Rail Input and Output Op Amps

Linear Technology 

LT1218/LT1219

Precision Rail-to-Rail Input

and Output Op Amps

FEATURES

s Rail-to-Rail Input and Output

s 90µV VOS(MAX) for VCM = V– to V+

s High Common Mode Rejection Ratio: 97dB Min

s C-LoadTM Stable Version (LT1219)

s High AVOL: 500V/mV Minimum Driving 10kΩ Load

s Wide Supply Range:

2V to ±15V (LT1218/LT1219)

2V to ±5V (LT1218L/LT1219L)

s Shutdown Mode: IS < 30µA

s Low Supply Current: 420µA Max

s Low Input Bias Current: 18nA Typical

s 300kHz Gain-Bandwidth Product (LT1218)

s Slew Rate: 0.10V/µs (LT1218)

U

APPLICATIONS

s Driving A/D Converters

s Test Equipment Amplifiers

s MUX Amplifiers

, LTC and LT are registered trademarks of Linear Technology Corporation.

C-Load is a trademark of Linear Technology Corporation.

TYPICAL APPLICATION

MUX Amplifier

5V

VIN1

+

LT1218L

VOUT

–

SHDN

VIN2

INPUT

SELECT

5V

+

LT1218L

–

SHDN

MAXIMUM IN

TO OUT ERROR

= 110µV FOR

0.05V ≤ VIN ≤ 4.8V

RL = 10k

74HCO4

1218/19 • TA01

DESCRIPTION

The LT®1218/LT1219 are bipolar op amps which combine

rail-to-rail input and output operation with precision speci-

fications. Unlike other rail-to-rail amplifiers, the LT1218/

LT1219’s input offset voltage is a low 90µV across the

entire rail-to-rail input range, not just a portion of it. Using

a patented technique, both input stages of the LT1218/

LT1219 are trimmed: one at the negative supply and the

other at the positive supply. The resulting common mode

rejection of 97dB minimum is much better than other rail-

to-rail input op amps. A minimum open-loop gain of

500V/mV into a 10k load virtually eliminates all gain error.

The LT1218 has conventional compensation which

assures stability for capacitive loads of 1000pF or less.

The LT1219 has compensation that requires the use of a

0.1µF output capacitor, which improves the amplifier’s

supply rejection and reduces output impedance at high

frequencies. The output capacitor’s filtering action also

reduces high frequency noise, which is beneficial when

driving A/D converters.

High and low voltage versions of the devices are offered.

Operation is specified for 3V, 5V and ±5V supplies for the

LT1218L/LT1219L and 3V, 5V and ±15V for the LT1218/

LT1219.

Voltage Follower Input to Output Error

10

VS = 5V

AV = 1

NO LOAD

1.0

MAX ERROR = 110µV

0.1

0.05V ≤ VIN ≤ 4.8V

0.01

0

1

0.05

2

3

INPUT VOLTAGE (V)

4

5

4.95

LT1218/19 • TA02

1

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