OPA859 1.8GHz Unity-Gain Bandwidth, 3.3nV/√Hz, FET Input Amplifier

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

+

±

VBIAS

CF

RF

3.5 V

5 V

+

±

VREF

TDC7201

(Time-to-

Digital

Converter)

Pulsed Laser

Diode

Rx

Lens

+

±

VBIAS

CF

RF

3.5 V

5 V

+

±

VREF

Tx

Lens

MSP430

Controller

Start 1

Stop 1

Start 2

Stop 2

OPA859

OPA859

TLV3501

TLV3501

High-Speed Time-of-Flight Receiver

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 low-

capacitance 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-of-

flight (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.

Package Information

PART NUMBER(1)

PACKAGE(2)

PACKAGE SIZE(3)

OPA859

DSG (WSON, 8) 2mm × 2mm

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

0

15

25

30

50

45

75

60

100

75

125

90

150

105

175

120

200

135

225

150

D409

f-3dB, RF = 2 k:

f-3dB, RF = 5 k:

IRN, RF = 2 k:

IRN, RF = 5 k:

Photodiode Capacitance vs Bandwidth and Noise

OPA859

SBOS852A – SEPTEMBER 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.