www.ti.com

OPA2

683

OPA2

683

OPA2683

Copyright © 2002-2009, 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.

SBOS244H – MAY 2002 – REVISED JULY 2009

Very Low-Power, Dual, Current-Feedback

Operational Amplifier

FEATURES

q REDUCED BANDWIDTH CHANGE VERSUS GAIN

q 150MHz BANDWIDTH G = +2

q > 80MHz BANDWIDTH TO GAIN > +10

q LOW DISTORTION: < –65dBc at 5MHz

q HIGH OUTPUT CURRENT: 110mA

q SINGLE-SUPPLY OPERATION: +5V to +12V

q DUAL-SUPPLY OPERATION:

q LOW SUPPLY CURRENT: 1.9mA Total

q POWER SHUTDOWN VERSION: MSOP-10

V+

V

O

V–

I

ERR

R

G

R

F

Z

+

Low-Power

Amplifier

U.S. Patent No. 6,724,260

DESCRIPTION

The OPA2683 provides a new level of performance for dual, very

amplifier is among the first to use an internally closed-loop input

buffer stage that significantly enhances performance over earlier

low-power, current-feedback (CFB) amplifiers. This new archi-

tecture provides many of the advantages of a more ideal CFB

amplifier while retaining the benefits of very low-power operation.

The closed-loop input stage buffer gives a very low and linearized

impedance path at the inverting input to sense the feedback error

current. This improved inverting input impedance gives excep-

tional bandwidth retention to much higher gains and improved

harmonic distortion over earlier solutions limited by inverting input

linearity. Beyond simple high gain applications, the OPA2683

considerable freedom from amplifier bandwidth interaction. This

APPLICATIONS

q LOW-POWER BROADCAST VIDEO DRIVERS

q

q SHORT-LOOP ADSL CO DRIVERS

q MULTICHANNEL SUMMING AMPLIFIERS

q PROFESSIONAL CAMERAS

q DIFFERENTIAL ADC INPUT DRIVERS

flexibility allows frequency response peaking elements to be

added, multiple input inverting summing circuits to have greater

bandwidth, and low-power differential line drivers to meet the

demanding requirements of DSL.

The output capability for the OPA2683 also sets a new mark in

performance for very low-power, current-feedback amplifiers. De-

livering a full

±4V

the output current to support this swing into a 100

Ω load. This

minimal output headroom requirement is complemented by a

similar 1.2V input stage headroom, giving exceptional capability for

single +5V operation.

The OPA2683’s low 1.9mA total supply current is precisely trimmed

at +25

°C. This trim, along with low shift over temperature and supply

voltage, gives a very robust design over a wide range of operating

conditions. Further system power reduction is possible using

the shutdown feature of the MSOP-10 package.

6

3

0

–3

–6

–9

–12

–15

–18

Frequency (Hz)

1

200

10

100

NONINVERTING SMALL-SIGNAL

FREQUENCY RESPONSE

G = 100

G = 50

G = 50

G = 10

G = 10

G = 1

G = 2

R

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.

www.ti.com