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Wideband, Low-Noise, Voltage-Feedback

OPERATIONAL AMPLIFIER

APPLICATIONS

q HIGH DYNAMIC RANGE ADC PREAMPS

q LOW-NOISE, WIDEBAND, TRANSIMPEDANCE

AMPLIFIERS

q WIDEBAND, HIGH GAIN AMPLIFIERS

q LOW-NOISE DIFFERENTIAL RECEIVERS

q VDSL LINE RECEIVERS

q ULTRASOUND CHANNEL AMPLIFIERS

q SECURITY SENSOR FRONT ENDS

q UPGRADE FOR THE OPA686, CLC425, AND

LMH6624

FEATURES

q HIGH BANDWIDTH: 400MHz (G = +10)

q LOW INPUT VOLTAGE NOISE: 1.2nV/

√Hz

q VERY LOW DISTORTION: –100dBc (5MHz)

q HIGH SLEW RATE: 625V/

q HIGH DC ACCURACY: V

q LOW SUPPLY CURRENT: 12.6mA

q HIGH GAIN BANDWIDTH PRODUCT: 1750MHz

q STABLE FOR GAINS

DESCRIPTION

The OPA846 combines very high gain bandwidth and large

signal performance with very low input voltage noise, while

dissipating a low 12.6mA supply current. The classical differ-

ential input stage, along with two stages of forward gain and

a high power output stage, combine to make the OPA846 an

exceptionally low distortion amplifier with excellent DC accu-

racy and output drive. The voltage-feedback architecture

allows all standard op amp applications to be implemented

with very high performance.

The combination of low input voltage and current noise,

along with a 1.75GHz gain bandwidth product, make the

OPA846 an ideal amplifier for wideband transimpedance

stages. As a voltage gain stage, the OPA846 is optimized for

a flat response at a gain of +10 and is stable down to a gain

of +7.

High Gain, 20MHz Transimpedance Amplifier

A new external compensation technique can be used to give

a very flat frequency response below the minimum stable

gain for the OPA846, further improving its already excep-

tional distortion performance. Using this compensation makes

the OPA846 one of the premier 12- to 16-bit Analog-to-Digital

(A/D) converter input drivers. The supply current for the

OPA846 is precisely trimmed to 12.6mA at +25

°C. This,

along with carefully defined supply current tempco in the

input and output stages, combine to provide exceptional

performance over the full specified temperature range.

OPA846 RELATED PRODUCTS

INPUT NOISE

GAIN BANDWIDTH

SINGLES

VOLTAGE (nV/

PRODUCT (MHz)

OPA842

2.4

200

OPA843

2.0

800

OPA847

0.85

3900

OPA846

SBOS250E – JULY 2002 – REVISED DECEMBER 2008

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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.

Copyright © 2002-2008, Texas Instruments Incorporated

OPA846

+5V

–5V

V

O

50k

Ω

0.1

µF

100pF

50k

Ω

0.2pF

10pF

Photodiode

I

S

–V

B

Power-supply

decoupling not shown.

λ

100

95

90

85

80

75

70

65

60

Frequency (MHz)

WIDEBAND TRANSIMPEDANCE

0.1

1

10

100

20 log(50k

Ω) = 94dBΩ

OPA846

OPA8

46

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.

All trademarks are the property of their respective owners.