OPA650 datasheet(12/24 Pages) TI2

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Video Line Driver

1/2

OPA2652

OUT

+5V

-5V

402W

Video

Output

Video

Input

1/2

OPA2652

402W

+5V

-5V

75.0W

DESIGN-IN TOOLS

Demonstration Fixtures

Pulse Delay Circuit

Macromodels and Applications Support

1/2

OPA2652

1/2

OPA2652

402W

+5V

-5V

+5V

-5V

Simple Bandpass Filter

OPA2652

SBOS125A – JUNE 2000 – REVISED MAY 2006

Figure 32 shows the OPA2652 used as a video line

driver. Its outstanding differential gain and phase

allow it to be used in studio equipment, while its low

cost and SOT23-8 package option also support

consumer applications.

Figure 34. Inverting Bandpass Filter

Figure 32. Video Line Driver

Two printed circuit boards (PCBs) are available to

assist in the initial evaluation of circuit performance

Figure 33 shows the OPA2652 used in a pulse delay

using the OPA2652 in its two package options. Both

circuit. This circuit cascades the two op amps in the

of these are offered free of charge as unpopulated

OPA2652, each forming a single pole, active allpass

PCBs, delivered with a user's guide. The summary

filter. The overall gain is +1, and the overall delay

information for these fixtures is shown in Table 1.

through the filter is:

Table 1. Demonstration Fixtures for the OPA2652

tGD = n(2RC), overall group delay

ORDERING

LITERATURE

n = 2, the number of cascaded stages

PRODUCT

PACKAGE

NUMBER

OPA2652U

SO-8

DEM-OPA-SO-2A

SBOU003

OPA2652E

SOT23-8

DEM-OPA-SOT-2A

SBOU001

The demonstration fixtures can be requested at the

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

OPA2652 product folder.

Computer simulation of circuit performance using

SPICE

often

useful

when

analyzing

the

Figure 33. Pulse Delay Circuit

performance of analog circuits and systems. This

method is particularly true for video and RF amplifier

circuits where parasitic capacitance and inductance

RF and RG need to be equal to maintain a constant

can have a major effect on circuit performance.

gain magnitude. The rise and fall times of the input

Check the Texas Instruments web site (www.ti.com)

pulses, tr(IN), should be slow enough to prevent

for available SPICE products (note that not all parts

pre-shoot artifacts in the response.

have models). These models do a good job of

tr(IN) ≥ 5RC, minimal pre-shoot

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

dG/d

φ characteristics. These models do not attempt

Figure 34 shows the OPA2652 used as simple

distinguish

between

the

package

types

bandpass filter. The OPA2652 is well-suited for this

small-signal AC performance.

type of circuit because it is very stable at a noise

gain of +1.

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