1 Features
• High unity-gain bandwidth: 1.8GHz
• Gain bandwidth product: 900MHz
• Ultra-low bias current MOSFET inputs: 10pA
• Low input voltage noise: 3.3nV/√Hz
• Slew rate: 1150V/μs
• Low Input capacitance:
– Common-mode: 0.6pF
– Differential: 0.2pF
• Wide input common-mode range:
– 1.4V from positive supply
– Includes negative supply
• 2.5VPP output swing in TIA configuration
• Supply voltage range: 3.3V to 5.25V
• Quiescent current: 20.5mA
• Package: 8-pin WSON
• Temperature range: –40°C to +125°C

2 Applications
• Optical time domain reflectometry (OTDR)
• 3D scanner
• Laser distance measurement
• Solid-state scanning LIDAR
• Optical ToF position sensor
• Drone vision
• Industrial robot LIDAR
• Vacuum robot LIDAR
• Silicon photomultiplier (SiPM) buffer amplifier
• Photomultiplier tube post amplifier

3 Description
The OPA859 is a wideband, low-noise operational
amplifier with CMOS inputs for wideband
transimpedance and voltage amplifier applications.
When the device is configured as a transimpedance
amplifier (TIA), the 0.9GHz gain bandwidth product
(GBWP) enables high closed-loop bandwidths in lowcapacitance
photodiode applications.
The following graph shows the bandwidth and
noise performance of the OPA859 as a function of
the photodiode capacitance when the amplifier is
configured as a TIA. The total noise is calculated
along a bandwidth range extending from dc to the
calculated frequency (f) on the left scale. The OPA859
package has a feedback pin (FB) that simplifies the
feedback network connection between the input and
the output.
The OPA859 is optimized to operate in optical time-offlight
(ToF) systems where the OPA859 is used with
time-to-digital converters, such as the TDC7201. Use
the OPA859 to drive a high-speed analog-to-digital
converter (ADC) in high-resolution LIDAR systems
with a differential output amplifier, such as the
THS4541 or LMH5401 devices.