OPA856 1.1-GHz Unity-Gain Bandwidth, 0.9 nV /√Hz , Bipolar Input Amplifier

1 Features

• Unity-Gain Bandwidth: 1.1 GHz

• Gain Bandwidth Product: 1.1 GHz

• Slew Rate: 350 V/µs

• Low Input Voltage Noise: 0.9 nV/√Hz

• Low Input Capacitance:

– Common-Mode: 0.4 pF

– Differential: 0.7 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: 17.2 mA

• Package: 8-Pin WSON

• Temperature Range: –40 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

• Vaccum Robot LIDAR

• Silicon Photomultiplier (SiPM) Buffer Amplifier

• Photomultiplier Tube Post Amplifier

3 Description

The OPA856 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 1.1-GHz gain bandwidth product

(GBWP) enables high closed-loop bandwidths in low-

capacitance photodiode applications.

The graph below shows the bandwidth and noise

performance of the OPA856 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-hand scale. The

OPA856 package has a feedback pin (FB) that

simplifies the feedback network connection between

the input and the output.

The OPA856 is optimized to operate in optical time-of-

flight (ToF) systems where the OPA856 is used with

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

the OPA856 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.

Device Information

PART NUMBER(1)

PACKAGE

BODY SIZE (NOM)

OPA856

WSON (8)

2.00 mm × 2.00 mm

(1)

For all available packages, see the package option

addendum at the end of the data sheet.

+

±

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

OPA856

OPA856

TLV3501

TLV3501

High-Speed Time-of-Flight Receiver

Photodiode Capacitance (pF)

0

2

4

6

8

10

12

14

16

18

20

0

0

50

15

100

30

150

45

200

60

250

75

300

90

350

105

400

120

450

135

Photodiode Capacitance vs Bandwidth and Noise

www.ti.com

OPA856

SBOS623 – OCTOBER 2020

Copyright © 2020 Texas Instruments Incorporated

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OPA856

SBOS623 – OCTOBER 2020

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.