LT1218_15 Datasheet, PDF (1/16 Pages) Linear Technology – Precision Rail-to-Rail Input and Output Op Amps

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-Load^TM _{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
V_IN1
+
LT1218L
V_OUT
–
SHDN
V_IN2
INPUT
SELECT
5V
+
LT1218L
–
SHDN
MAXIMUM IN
TO OUT ERROR
= 110µV FOR
0.05V ≤ V_IN ≤ 4.8V
R_L = 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
V_S = 5V
A_V = 1
NO LOAD
1.0
MAX ERROR = 110µV
0.1
0.05V ≤ V_IN ≤ 4.8V
0.01
0
1
0.05
2
3
INPUT VOLTAGE (V)
4
5
4.95
LT1218/19 • TA02
1