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

1 Features

• AEC-Q100 Qualified for Automotive Applications:

• High Gain Bandwidth Product: 8 GHz

• Decompensated, Gain ≥ 7 V/V (Stable)

• Low Input Voltage Noise: 0.98 nV/√Hz

• Slew Rate: 2750 V/µs

• Low Input Capacitance:

– Common-Mode: 0.6 pF

– Differential: 0.2 pF

• Wide Input Common-Mode Range:

– 0.4 V from Positive Supply

– 1.1 V from Negative Supply

• Supply Voltage Range: 3.3 V to 5.25 V

• Quiescent Current: 17.8 mA

• Package: 8-Pin WSON

• Temperature Range: –40°C to +125°C

2 Applications

• Automotive LIDAR

• Time-of-Flight (ToF) Camera

• Optical Time Domain Reflectometry (OTDR)

• 3D Scanner

• Laser Distance Measurement

• Solid-State Scanning LIDAR

• Optical ToF Position Sensor

• Drone Vision

• Silicon Photomultiplier (SiPM) Buffer Amplifier

• Photomultiplier Tube Post Amplifier

3 Description

The

OPA855-Q1

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 8-GHz gain bandwidth product

(GBWP) enables high closed-loop bandwidths at

transimpedance gains of up to tens of kΩs.

The graph below shows the bandwidth and noise

performance of the OPA855-Q1 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-Q1 package has a feedback pin (FB) that

simplifies the feedback network connection between

the input and the output.

The OPA855-Q1 is optimized to operate in optical

time-of-flight (ToF) systems where the OPA855-Q1

is used with time-to-digital converters, such as the

TDC7201. Use the OPA855-Q1 to drive a high-speed

analog-to-digital converter (ADC) in high-resolution

LIDAR systems with a differential output amplifier,

such as the THS4541-Q1.

Device Information

PART NUMBER(1)

PACKAGE

BODY SIZE (NOM)

OPA855-Q1

WSON (8)

2.00 mm × 2.00 mm

(1)

See the package option addendum at the end of the data

sheet for all available packages.

+

±

3.8 V

5 V

+

±

TDC7201

(Time-to-

Digital

Converter)

Pulsed Laser

Diode

Rx

Lens

+

±

3.8 V

5 V

+

±

Tx

Lens

MSP430

Controller

Start 1

Stop 1

Start 2

Stop 2

OPA855

OPA855

TLV3501

TLV3501

High-Speed Time-of-Flight Receiver

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

Photodiode Capacitance vs Bandwidth and Noise

OPA855-Q1

SBOSA57A – FEBRUARY 2021 – REVISED MARCH 2021

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.