www.ti.com

Time (10ns/div)

4

3

2

1

0

-1

-2

-3

-4

V

IN

V

OUT

G049

DESIGN-IN TOOLS

Applications Support

Demonstration Boards

OPERATING SUGGESTIONS

Theory of Operation

Output Limiters

OPA699M

SGLS289A – MAY 2005 – REVISED MARCH 2006

APPLICATION INFORMATION (continued)

Figure 57. Schmitt Trigger Time Domain Response for a 10-MHz Sinewave

The Texas Instruments Applications Department is available for design assistance at 1-972-644-5580. The Texas

Instruments web site (www.ti.com) has the latest product data sheets and other design tools.

A PC board is available to assist in the initial evaluation of circuit performance of the OPA699ID. It is available as

an unpopulated PCB with descriptive documentation, and can be requested through the Texas Instruments web

site. See the demonstration board literature for more information. The summary information for this board is

shown in Table 1.

Table 1. Evaluation Module Ordering Information

PRODUCT

PACKAGE

BOARD PART NUMBER

LITERATURE NUMBER

OPA699ID

SO-8

DEM-OPA-SO-1A

SBOU009

The OPA699 is a voltage-feedback, gain of +4 V/V stable op amp. The output voltage is limited to a range set by

the voltage on the limiter pins (5 and 8). When the input tries to overdrive the output, the limiters take control of

the output buffer. This action from the limiters avoids saturating any part of the signal path, giving quick overdrive

recovery and excellent limiter accuracy at any signal gain. The limiters have a sharp transition from the linear

region of operation to output limiting. This transition allows the limiter voltages to be set near (< 100 mV) the

desired signal range. The distortion performance is also good near the limiter voltages.

gain. The transition from the linear region of operation to output limiting is sharp—the desired output signal can

in the electrical specifications. Looking at Figure 58 for the zero bias current case shows the expected range of

24

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