SBOU006 datasheet(16/33 Pages) TI2

16 / 33 page

OPA3691

SBOS227E

www.ti.com

ORDERING

LITERATURE

PRODUCT

PACKAGE

NUMBER

OPA3691IDBQ

SSOP-16

DEM-OPA-SSOP-3A

SBOU006

OPA3691ID

SO-16

DEM-OPA-SO-3A

SBOU007

DESIGN-IN TOOLS

DEMONSTRATION FIXTURES

Two printed circuit boards (PCBs) are available to assist in

the initial evaluation of circuit performance using the OPA3691

in its two package options. Both of these are offered free of

charge as unpopulated PCBs, delivered with a user's guide.

The summary information for these fixtures is shown in the

table below.

FIGURE 8. Wideband Programmable Gain.

1/3

OPA3691

73.2

Ω

191

Ω

365

Ω

1/3

OPA3691

68.1

Ω

61.2

Ω

274

Ω

1/3

OPA3691

63.4

Ω

182

Ω

74HC238

Ω Load

–5V

+5V

Power-supply

decoupling not shown.

+5V

Ω

active devices, like the OPA3691, where parasitic capaci-

tance and inductance can have a major effect on frequency

response.

SPICE models will be available through the TI web page or

on a disk (call our Applications Department). These models

do a good job of predicting small-signal AC and transient

performance under a wide variety of operating conditions.

They do not do as well in predicting the harmonic distortion

or differential gain and phase characteristics. These models

do not distinguish between the AC performance of different

package types.

OPERATING SUGGESTIONS

SETTING RESISTOR VALUES TO

OPTIMIZE BANDWIDTH

A current-feedback op amp like the OPA3691 can hold an

almost constant bandwidth over signal gain settings with the

proper adjustment of the external resistor values. This is

shown in the Typical Characteristics; the small-signal band-

width decreases only slightly with increasing gain. These

curves also show that the feedback resistor has been changed

for each gain setting. The resistor

values on the inverting side

The demonstration fixtures can be requested at the Texas

Instruments web site (www.ti.com) through the OPA3691

product folder.

SPICE MODELS

Computer simulation of circuit performance using SPICE is

often useful when analyzing the performance of analog

circuits and systems. This is particularly true for high-speed

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