LTC6269_15 Datasheet, PDF (1/24 Pages) Linear Technology – 500MHz Ultra-Low Bias Current FET Input Op Amp

LTC6268/LTC6269
500MHz Ultra-Low Bias
Current FET Input Op Amp
FEATURES
n _{Gain Bandwidth Product: 500MHz}
n _{–3dB Bandwidth (A = 1): 350MHz}
n _{Low Input Bias Current:}
±3fA Typ. Room Temperature
4pA Max at 125°C
n _{Current Noise (100kHz): 5.5fA/√Hz}
n _{Voltage Noise (1MHz): 4.3nV/√Hz}
n _{Extremely Low CIN 450fF}
n _{Rail-to-Rail Output}
n _{Slew Rate: 400V/µs}
n _{Supply Range: 3.1V to 5.25V}
n _{Quiescent Current: 16.5mA}
n _{Harmonic Distortion (2VP-P):}
–100dB at 1MHz
–80dB at 10MHz
n _{Operating Temp Range: –40°C to 125°C}
n _{Single in 8-Lead SO-8, 6-Lead TSOT-23 Packages}
n _{Dual in 8-Lead MS8, 3mm × 3mm 10-Lead DFN 10 Packages}
APPLICATIONS
n _{Trans-Impedance Amplifiers}
n _{ADC Drivers}
n _{CCD Output Buffer}
n _{Photomultiplier Tube Post-Amplifier}
n _{Low IBIAS Circuits}
DESCRIPTION
The LTC^®6268/LTC6269 is a single/dual 500MHz FET-input
operational amplifier with extremely low input bias current
and low input capacitance. It also features low input-
referred current noise and voltage noise making it an ideal
choice for high speed transimpedance amplifiers, CCD
output buffers, and high-impedance sensor amplifiers.
Its low distortion makes the LTC6268/LTC6269 an ideal
amplifier for driving SAR ADCs.
It operates on 3.1V to 5.25V supply and consumes 16.5mA
per amplifier. A shutdown feature can be used to lower
power consumption when the amplifier is not in use.
The LTC6268 single op amp is available in 8-lead SOIC and
6-lead SOT-23 packages. The SOIC package includes two
unconnected pins which can be used to create an input pin
guard ring to protect against board leakage currents. The
LTC6269 dual op amp is available in 8-lead MSOP with
exposed pad and 3mm × 3mm 10-lead DFN packages.
They are fully specified over the –40°C to 85°C and the
–40°C to 125°C temperature ranges.
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
TYPICAL APPLICATION
20kΩ Gain 65MHz Trans-Impedance Amplifier
2.5V
PD
I_PD
20kΩ*
2.5V
–
LTC6268
+
PARASITIC
FEEDBACK C
V_OUT = –I_PD • 20k
BW = 65MHz
–2.5V
6268 TA01
PD = OSI OPTOELECTRONICS, FCI-125G-006
*TWO 40.2kΩ 0603 PACKAGE RESISTORS IN PARALLEL
20kΩ TIA Frequency Response
100
90
80
70
60
50
40
0.01
0.1
1
10 100 1000
FREQUENCY (MHz)
6268 TA02
For more information www.linear.com/LTC6268
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