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OPA683

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Copyright © 2001-2008, 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.

SBOS221E – NOVEMBER 2001 – REVISED JULY 2008

Very Low-Power, Current Feedback

OPERATIONAL AMPLIFIER With Disable

FEATURES

q REDUCED BANDWIDTH CHANGE VERSUS GAIN

q 150MHz BANDWIDTH G = +2

q > 90MHz BANDWIDTH TO GAIN > +10

q LOW DISTORTION: < –69dBc at 5MHz

q HIGH OUTPUT CURRENT: 110mA

q SINGLE +5V TO +12V SUPPLY OPERATION

q DUAL

q LOW SUPPLY CURRENT: 0.94mA

q LOW SHUTDOWN CURRENT: 100

V+

V

O

V–

I

ERR

R

G

R

F

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

Z

+

Low-Power

Amplifier

9

6

3

0

–3

–6

–9

–12

–15

–18

–21

1

10

200

100

R

Frequency (MHz)

OPA683 BANDWIDTH vs GAIN

G = 10

G = 20

G = 50

G = 100

G = 2

G = 5

DESCRIPTION

The OPA683 provides a new level of performance in very low-

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

stage that enhances performance significantly over earlier low-

power CFB amplifiers. While retaining the benefits of very low

power operation, this new architecture provides many of the

advantages of a more ideal CFB amplifier. 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 exceptional bandwidth retention to

much higher gains and improved harmonic distortion over earlier

solutions limited by inverting input linearity. Beyond simple high

setting element to be set with considerable freedom from amplifier

bandwidth interaction. This allows frequency response peaking

elements to be added, multiple input inverting summing circuits to

OPA6

83

OPA6

83

APPLICATIONS

q LOW POWER BROADCAST VIDEO DRIVERS

q EQUALIZING FILTERS

q SAW FILTER HIGH GAIN POST AMPLIFIERS

q SHORT LOOP ADSL CO DRIVERS

q MULTICHANNEL SUMMING AMPLIFIERS

q PROFESSIONAL CAMERAS

q ADC INPUT DRIVERS

have greater bandwidth, and low-power line drivers to meet the

demanding requirements of studio cameras and broadcast video.

The output capability for the OPA683 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 OPA683’s low 0.94mA 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. System power may be further reduced by using the

optional disable control pin. Leaving this disable pin open, or holding

it HIGH, gives normal operation. If pulled LOW, the OPA683 supply

current drops to less than 100

µA while the I/O pins go to a high

impedance state.

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.