OPAx145 High-Precision, Low-Noise, Rail-to-Rail Output, 5.5-MHz

JFET Operational Amplifiers

1 Features

• Best bandwidth and slew-rate-to-power ratio:

– gain-bandwidth product: 5.5 MHz

– Slew rate: 20 V/μs

– Low supply current: 475 µA (maximum)

• High precision:

– Very low offset: 150 μV (maximum)

– Very low offset drift: 1 μV/°C (maximum)

• Low input bias current: 2 pA

• Excellent noise performance:

– Very low voltage noise: 7 nV/√Hz

– Very low current noise: 0.8 fA/√ Hz

• Input-voltage range includes V– supply

• Single-supply operation: 4.5 V to 36 V

• Dual-supply operation: ±2.25 V to ±18 V

2 Applications

• Semiconductor test

• Lab and field instrumentation

• Source measurement unit (SMU)

• Weigh scale

• Intra-DC interconnect (metro)

• Merchant network and server PSU

• DC power supply, ac source, electronic load

• Data acquisition (DAQ)

3 Description

The OPA145 and OPA2145 (OPAx145) devices are

part of a family of low-power JFET input amplifier that

have excellent drift, low current noise, and pico-

ampere input bias current. These features make the

OPZx145 an excellent choice for amplifying small

signals from high-impedance sensors.

The rail-to-rail output swing interfaces to modern,

single-supply, precision, analog-to-digital converters

(ADCs) and digital-to-analog converters (DACs). In

addition, the input range that includes V– allows

designers to simplify power management and take

advantage of the single-supply, low-noise JFET

architecture.

Device Information (1)

PART NUMBER

PACKAGE

BODY SIZE (NOM)

OPA145

SOIC (8)

4.90 mm × 3.91 mm

VSSOP (8)

3.00 mm × 3.00 mm

SOT-23 (5)

2.90 mm × 1.60 mm

OPA2145

SOIC (8) (Preview)

4.90 mm × 3.91 mm

VSSOP (8) (Preview) 3.00 mm × 3.00 mm

(1)

For all available packages, see the package option

addendum at the end of the data sheet.

+

±

OPA145

GND

+10V

+

±

OPA145

GND

+10V

R

1

50 k

R

2

50 k

9 pF

9 pF

Fast Silicon

PIN Photodiode

5 A

3.8 pF

2.5 mW/cm

2

Photovoltaic Mode

22

22

Copyright © 2017, Texas Instruments Incorporated

ò ‡ 9

REF

+

±

OPA145

GND

+10V

+

±

OPA145

GND

+10V

180

180

432p

432p

GND

200p

200p

ADS8867

AINP

AINN

REF

2.5 V to 5 V

AVDD

2.7 V to 3.6 V

GND

OPAx145 Excels in 16-bit, 100-kSPS Fully

Differential Transimpedance Imaging Application

-3

-1.5

0

1.5

3

±20

±15

±10

±5

0

5

10

15

20

Input Common-mode Voltage (V)

C001

OPAx145 Precision JFET Technology Offers

Excellent Linear Input Impedance

www.ti.com

OPA145,, OPA2145

SBOS427E – JUNE 2017 – REVISED OCTOBER 2020

Copyright © 2020 Texas Instruments Incorporated

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1

Product Folder Links: OPA145, OPA2145

OPA145,, OPA2145

SBOS427E – JUNE 2017 – REVISED 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. UNLESS OTHERWISE NOTED, this document contains PRODUCTION

DATA.