THS4601

SLOS388B – OCTOBER 2001 – REVISED JUNE 2002

WIDEBAND, FET-INPUT OPERATIONAL AMPLIFIER

1

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FEATURES

APPLICATIONS

DESCRIPTION

The THS4601 is a high-speed, FET-input operational

amplifier designed for applications requiring wideband

operation, high-input impedance, and high-power

supply voltages. By providing a 180-MHz gain-

bandwidth product,

±15-V supply operation, and

100-pA input bias current, the THS4601 is capable of

wideband transimpedance gain and large output signal

swing simultaneously. Low current and voltage noise

allow amplification of extremely low-level input signals

while still maintaining a large signal-to-noise ratio.

The characteristics of the THS4601 ideally suit it for use

as a wideband photodiode amplifier. Photodiode output

current is a prime candidate for transimpedance

amplification, an application of which is illustrated in

Figure 1. Other potential applications include test and

measurement systems requiring high-input impedance,

digital-to-analog converter output buffering, high-speed

integration, and active filtering.

A SELECTION OF RELATED OPERATIONAL AMPLIFIER PRODUCTS

DEVICE

VS

(V)

BW

(MHz)

SLEW RATE

(V/

µs)

VOLTAGE NOISE

(nV

√Hz)

DESCRIPTION

OPA627

±15

16

55

4.5

Unity-gain stable FET-input amplifier

OPA637

±15

80

135

4.5

Gain of +5 stable FET-input amplifier

OPA655

±5

400

290

6

Unity-gain stable FET-input amplifier

_

+

THS4601

CF = 0.7 pF

λ

RL = 1 kΩ

60

65

70

75

80

85

90

95

100

105

0.1

1

10

100

Frequency – MHz

100 k

Ω TRANSIMPEDANCE BANDWIDTH

Diode Capacitance: 18 pF

–3 dB Bandwidth: 4 MHz

Figure 1. Wideband Photodiode

Transimpedance Amplifier

RF = 100 kΩ

–VBias

18 pF

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of Texas Instruments

standard warranty. Production processing does not necessarily include

testing of all parameters.

Copyright

 2002, Texas Instruments Incorporated

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.