LT1498_09 Datasheet, PDF (1/20 Pages) Linear Technology – Driving A-to-D Converters

LT1498/LT1499
10MHz, 6V/µs, Dual/Quad
Rail-to-Rail Input and Output
Precision C-Load Op Amps
FEATURES
DESCRIPTION
n _{Rail-to-Rail Input and Output}
n _{475μV Max VOS from V}⁺ _{to V}^–
n _{Gain-Bandwidth Product: 10MHz}
n _{Slew Rate: 6V/μs}
n _{Low Supply Current per Amplifier: 1.7mA}
n _{Input Offset Current: 65nA Max}
n _{Input Bias Current: 650nA Max}
n _{Open-Loop Gain: 1000V/mV Min}
n _{Low Input Noise Voltage: 12nV/√Hz Typ}
n _{Wide Supply Range: 2.2V to ±15V}
n _{Large Output Drive Current: 30mA}
n _{Stable for Capacitive Loads Up to 10,000pF}
n _{Dual in 8-Pin PDIP and SO Package}
n _{Quad in Narrow 14-Pin SO}
APPLICATIONS
n _{Driving A-to-D Converters}
n _{Active Filters}
n _{Rail-to-Rail Buffer Amplifiers}
n _{Low Voltage Signal Processing}
n _{Battery-Powered Systems}
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and C-Load
is a trademark of Linear Technology Corporation. All other trademarks are the property of their
respective owners.
The LT^®1498/LT1499 are dual/quad, rail-to-rail input and
output precision C-Load™ op amps with a 10MHz gain-
bandwidth product and a 6V/μs slew rate.
The LT1498/LT1499 are designed to maximize input
dynamic range by delivering precision performance over
the full supply voltage. Using a patented technique, both
input stages of the LT1498/LT1499 are trimmed, one at
the negative supply and the other at the positive supply.
The resulting guaranteed common mode rejection is much
better than other rail-to-rail input op amps. When used as
a unity-gain buffer in front of single supply 12-bit A-to-D
converters, the LT1498/LT1499 are guaranteed to add less
than 1LSB of error even in single 3V supply systems.
With 110dB of supply rejection, the LT1498/LT1499 main-
tain their performance over a supply range of 2.2V to 36V
and are specified for 3V, 5V and ±15V supplies. The inputs
can be driven beyond the supplies without damage or phase
reversal of the output. These op amps remain stable while
driving capacitive loads up to 10,000pF.
The LT1498 is available with the standard dual op amp
configuration in 8-pin PDIP and SO packaging. The LT1499
features the standard quad op amp configuration and is
available in a 14-pin plastic SO package. These devices
can be used as plug-in replacements for many standard
op amps to improve input/output range and precision.
TYPICAL APPLICATION
Single Supply 100kHz 4th Order Butterworth Filter
6.81k
V_IN
6.81k
11.3k
330pF
100pF
–
1/2 LT1498
+
V⁺/2
5.23k
5.23k
10.2k
47pF
V⁺
–
1000pF
1/2 LT1498
+
1498 TA01
V_OUT
10
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
–110
100
Frequency Response
V_IN = 2.7V_P-P
V⁺ = 3V
1k 10k 100k 1M 10M
FREQUENCY (Hz)
1498 TA02
14989fe
1