OPA855 8GHz Gain Bandwidth Product, Gain of 7V/V Stable, Bipolar Input Amplifier

1 Features

• High gain bandwidth product: 8GHz

• Decompensated, gain ≥ 7V/V (stable)

• Low input voltage noise: 0.98nV/√Hz

• Slew rate: 2750V/µs

• Low Input capacitance:

– Common-mode: 0.6pF

– 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: 17.8mA

• Package: 8-pin WSON

– Bare die

• 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

+

±

VBIAS

CF

RF

3.8 V

5 V

+

±

VREF

TDC7201

(Time-to-

Digital

Converter)

Pulsed Laser

Diode

Rx

Lens

+

±

VBIAS

CF

RF

3.8 V

5 V

+

±

VREF

Tx

Lens

MSP430

Controller

Start 1

Stop 1

Start 2

Stop 2

OPA855

OPA855

TLV3501

TLV3501

High-Speed Time-of-Flight Receiver

3 Description

The OPA855 is a wideband, low-noise operational

amplifier

with

bipolar

inputs

for

wideband

transimpedance and voltage amplifier applications.

When the device is configured as a transimpedance

amplifier (TIA), the 8GHz gain bandwidth product

(GBWP) enables high closed-loop bandwidths at

transimpedance gains of up to tens of kilohms.

The following graph shows the bandwidth and

noise performance of the OPA855 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 OPA855

package has a feedback pin (FB) that simplifies the

feedback network connection between the input and

the output.

The OPA855 is optimized to operate in optical time-of-

flight (ToF) systems where the OPA855 is used with

time-to-digital converters, such as the TDC7201. Use

the OPA855 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.

Package Information

PART NUMBER(1)

PACKAGE(2)

PACKAGE SIZE(3)

OPA855

DSG (WSON, 8)

2mm × 2mm

Device Information

PART NUMBER(1)

PACKAGE(2)

DIE SIZE (NOM)

OPA855

Bare die

0.751mm × 0.705mm

(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.

Photodiode capacitance (pF)

0

2

4

6

8

10

12

14

16

18

20

50

0

100

20

150

40

200

60

250

80

300

100

350

120

400

140

450

160

D609

f-3dB, RF = 6 k:

f-3dB, RF = 12 k:

IRN, RF = 6 k:

IRN, RF = 12 k:

Photodiode Capacitance vs Bandwidth and Noise

OPA855

SBOS622D – JULY 2018 – REVISED MAY 2025

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. PRODUCTION DATA.