LT1218/LT1219
Precision Rail-to-Rail Input
and Output Op Amps
FEATURES
s
s
s
s
s
s
DESCRIPTION
The LT
庐
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鈥檚 input offset voltage is a low 90碌V 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
0.1碌F output capacitor, which improves the amplifier鈥檚
supply rejection and reduces output impedance at high
frequencies. The output capacitor鈥檚 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
卤5V
supplies for the
LT1218L/LT1219L and 3V, 5V and
卤15V
for the LT1218/
LT1219.
s
s
s
s
s
Rail-to-Rail Input and Output
90
碌
V V
OS(MAX)
for V
CM
= V
鈥?/div>
to V
+
High Common Mode Rejection Ratio: 97dB Min
C-Load
TM
Stable Version (LT1219)
High A
VOL
: 500V/mV Minimum Driving 10k鈩?Load
Wide Supply Range:
2V to
卤15V
(LT1218/LT1219)
2V to
卤5V
(LT1218L/LT1219L)
Shutdown Mode: I
S
< 30碌A
Low Supply Current: 420碌A Max
Low Input Bias Current: 18nA Typical
300kHz Gain-Bandwidth Product (LT1218)
Slew Rate: 0.10V/碌s (LT1218)
APPLICATIONS
s
s
s
Driving A/D Converters
Test Equipment Amplifiers
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
Voltage Follower Input to Output Error
10
V
S
= 5V
A
V
= 1
NO LOAD
V
OUT
+
LT1218L
鈥?/div>
SHDN
铮?/div>
ERROR
铮?/div>
(mV)
1.0
5V
V
IN2
0.1
+
LT1218L
鈥?/div>
INPUT
SELECT
74HCO4
SHDN
MAXIMUM IN
TO OUT ERROR
= 110碌V FOR
0.05V
鈮?/div>
V
IN
鈮?/div>
4.8V
R
L
= 10k
0.01
0
0.05
1
2
3
4
4.95
5
INPUT VOLTAGE (V)
LT1218/19 鈥?TA02
1218/19 鈥?TA01
U
U
U
MAX ERROR = 110碌V
0.05V
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