LT1122_15 Datasheet, PDF (1/14 Pages) Linear Technology – Fast Settling, JFET Input Operational Amplifier

LT1122
Fast Settling, JFET Input
Operational Amplifier
FEATURES
n _{100% Tested Settling Time 340ns Typ}
to 1mV at Sum Node, 10V Step 540ns Max
Tested with Fixed Feedback Capacitor
n _{Slew Rate 60V/µs Min}
n _{Gain-Bandwidth Product}
14MHz
n _{Power Bandwidth (20VP-P) 1.2 MHz}
n _{Unity-Gain Stable; Phase Margin}
60°
n _{Input Offset Voltage 600µV Max}
n _{Input Bias Current}
25°C
75pA Max

70°C 600pA Max
■ _{Input Offset Current}
25°C
40pA Max

70°C 150pA Max
■ _{Low Distortion}
APPLICATIONS
n _{Fast 12-Bit D/A Output Amplifiers}
n _{High Speed Buffers}
n _{Fast Sample-and-Hold Amplifiers}
n _{High Speed Integrators}
n _{Voltage to Frequency Converters}
n _{Active Filters}
n _{Log Amplifiers}
n _{Peak Detectors}
DESCRIPTION
The LT^®1122 JFET input operational amplifier combines
high speed and precision performance.
A unique poly-gate JFET process minimizes gate series
resistance and gate-to-drain capacitance, facilitating wide
bandwidth performance, without degrading JFET transis-
tor matching.
It slews at 80V/µs and settles in 340ns. The LT1122 is
internally compensated to be unity-gain stable, yet it has
a bandwidth of 14MHz at a supply current of only 7mA. Its
speed makes the LT1122 an ideal choice for fast settling
12-bit data conversion and acquisition systems.
The LT1122 offset voltage of 120µV, and voltage gain of
500,000 also support the 12-bit accurate applications.
The input bias current of 10pA and offset current of 4pA
combined with its speed allow the LT1122 to be used in
such applications as high speed sample and hold ampli-
fiers, peak detectors, and integrators.
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.
TYPICAL APPLICATION
12-Bit Voltage Output D/A Converter
0mA TO 2mA
OR 4mA
+
CF
2_–
LT1122
6
V_OUT
0V TO 10V
+
3
Large-Scale Response
12-BIT CURRENT OUTPUT D/A CONVERTER
C_F = 5pF TO 17pF
(DEPENDING ON D/A CONVERTER USED)
LT1122•TA01
200ns/DIV
A_V = –1
For more information www.linear.com/LT1122
1122 TA07
1122fb
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