OPA955 11GHz Gain Bandwidth Product, Gain of 7V/V Stable, Bipolar Input Amplifier

1 Features

• High gain bandwidth product: 11GHz

• Decompensated, gain ≥ 7V/V (stable)

• Ultra low input voltage noise: 0.79nV/√Hz

• Slew rate: 3750V/µs

• Low input capacitance:

– Common-mode: 0.9pF

– Differential: 0.2pF

• Wide input common-mode range:

– 0.4V from positive supply

– 1.1V from negative supply

• 3VPP total output swing

• Supply voltage range: 3.3V to 5.25V

• Quiescent current: 20.2mA

• Package: 8-pin WSON

• Temperature range: –40°C to +125°C

2 Applications

• Optical time domain reflectometry (OTDR) front-

end

• ToF LiDAR front-end

• Active probe design

• Optical In-vitro diagnostics (IVD) front-end

• Solid-state scanning LiDAR front-end

• Silicon photomultiplier (SiPM) buffer amplifier

• Photomultiplier tube post amplifier

• High-speed data acquisition (DAQ)

3 Description

The OPA955 is a wideband, ultra-low noise

operational amplifier with bipolar inputs for wideband

transimpedance and voltage feedback amplifier

applications. When the device is configured as a

transimpedance amplifier (TIA), the 11GHz gain

bandwidth product (GBWP) enables high closed-

loop bandwidths at transimpedance gains up to

tens of kilohms. The following graphs show the

transimpedance

bandwidth

and

transimpedance

pulse response performance of the OPA955 in low-

capacitance photodiode (PD) applications.

The OPA955 is a viable amplifier for wideband

transimpedance

applications,

high-speed

data

acquisition systems, and applications with weak signal

inputs that require ultra-low noise and high-gain front

ends. For example, the OPA955 can operate in

optical time-of-flight (ToF) systems along with time-

to-digital converters, such as the TDC7201, and

integrated laser drivers, such as the LMH13000. The

OPA955 can also be used 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. For

optimized frequency respone, the OPA955 package

has a feedback pin (FB) that simplifies the feedback

network connection between the input and output.

Package Information

PART NUMBER(1)

PACKAGE(2)

PACKAGE SIZE(3)

OPA955

DSG (WSON, 8)

2mm × 2mm

(1)

See the Device Comparison Table.

(2)

For more information, see Section 12.

(3)

The package size (length × width) is a nominal value and

includes pins, where applicable.

Frequency (Hz)

-18

-15

-12

-9

-6

-3

0

3

6

1M

10M

100M

1G

RF = 10 k , CF = 0.1 pF

IIN = 20 µAPP, CIN = 4.7pF

Transimpedance Bandwidth vs Frequency

Time (10 ns/div)

RF = 10 k , CF = 0.1 pF

VOUT = Mid-Supply

IIN = 100 µA Pulse, CIN = 4.7pF

Transimpedance Pulse Response

OPA955

SLOSEE6 – JULY 2026

An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,

intellectual property matters and other important disclaimers. ADVANCE INFORMATION for preproduction products; subject to change

without notice.