DGN−8

DDA−8

D−8

_

+

λ

Photodiode Circuit

THS4631

www.ti.com

SLOS451B

– DECEMBER 2004 – REVISED AUGUST 2011

HIGH-VOLTAGE, HIGH SLEW RATE, WIDEBAND

FET-INPUT OPERATIONAL AMPLIFIER

Check for Samples: THS4631

1

FEATURES

DESCRIPTION

The THS4631 is a high-speed, FET-input operational

2

•

High Bandwidth:

amplifier designed for applications requiring wideband

– 325 MHz in Unity Gain

operation, high-input impedance, and high-power

– 210 MHz Gain Bandwidth Product

supply voltages. By providing a 210-MHz gain

bandwidth product,

±15-V supply operation, and

•

High Slew Rate:

100-pA input bias current, the THS4631 is capable of

– 900 V/µs (G = 2)

simultaneous wideband transimpedance gain and

– 1000 V/µs (G = 5)

large output signal swing. The fast 1000 V/

µs slew

rate allows for fast settling times and good harmonic

•

Low Distortion of

–76 dB, SFDR at 5 MHz

distortion at high frequencies. Low current and

•

Maximum Input Bias Current: 100 pA

voltage

noise

allow

amplification

of

extremely

•

Input Voltage Noise: 7 nV/

√Hz

low-level input signals while still maintaining a large

signal-to-noise ratio.

•

Maximum Input Offset Voltage: 500

µV at 25°C

•

Low Offset Drift: 2.5

µV/°C

The characteristics of the THS4631 make it ideally

suited for use as a wideband photodiode amplifier.

•

Photodiode output current is a prime candidate for

•

Wide Supply Range:

± 5 V to ± 15 V

transimpedance amplification as shown below. Other

•

High Output Current: 95 mA

potential applications include test and measurement

systems requiring high-input impedance, ADC and

APPLICATIONS

DAC buffering, high-speed integration, and active

filtering.

•

Wideband Photodiode Amplifier

The THS4631 is offered in an 8-pin SOIC (D), and

•

High-Speed Transimpedance Gain Stage

the 8-pin SOIC (DDA) and MSOP (DGN) with

•

Test and Measurement Systems

PowerPAD

™ package.

•

Current-DAC Output Buffer

Related FET Input Amplifier Products

•

Active Filtering

SLEW

VOLTAGE

•

High-Speed Signal Integrator

GBWP

MINIMUM

DEVICE

RATE

NOISE

(V)

(MHz)

GAIN

(V/

µS)

(nV/

√Hz)

•

High-Impedance Buffer

OPA656

±5

230

290

7

1

OPA657

±5

1600

700

4.8

7

OPA627

±15

16

55

4.5

1

THS4601

±15

180

100

5.4

1

1

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas

Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

2

PowerPad is a trademark of Texas Instruments.

PRODUCTION DATA information is current as of publication date.

Copyright

© 2004–2011, Texas Instruments Incorporated

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.