LT6411 datasheet(13/16 Pages) LINER

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LT6411

6411f

TYPICAL APPLICATIONS

Figure 9. 2-Tone Response of the LT6411 Conﬁgured with

Single-Ended Inputs Driving the LTC2249 at 29.5MHz, 30.5MHz

Twisted-Pair Line Driver

The LT6411 is ideal when used for driving inexpensive

unshielded twisted-pair wires as often found in telephone

or communications infrastructure. The input can be com-

posite video, or if three parts are used, RGB or similar and

can be either single ended or differential. The LT6411 has

excellent performance with all formats.

Double termination of the video cable will enhance ﬁdelity

and isolate the LT6411 from capacitive loads. Although

most twisted-pair cables have a characteristic impedance

Figure 10. Twisted-Pair Driver

FREQUENCY (MHz)

–140

–120

–100

–80

–40

6411 F09

–20

–60

–130

–110

–90

–10

–50

–30

–70

32768 POINT FFT

TONE 1 AT 29.5MHz, –7dBFS

TONE 2 AT 30.5MHz, –7dBFS

IM3 = –90dBc

Ω

100

Ω

–5V

6,9,10

1,2,3,7

6411 F10

RECEIVER

LT6411

AV = 2

IN+

IN–

–

11,12

of 100

Ω, the cables can be terminated with a smaller

series resistance or a larger shunt resistance in order to

compensate for attenuation. A typical circuit for a twisted-

pair driver is shown in Figure 10.

Single Supply Differential ADC Driver

The LT6411 is well suited for driving differential analog

to digital converters. The low output impedance of the

LT6411 is capable of driving a variety of ﬁlters as well as

interfacing with the typically high impedance inputs of

ADCs. In addition, the LT6411’s excellent distortion allows

the part to perform with an SFDR below the limits of many

high speed ADCs. The DC1057 demo board, shown sche-

matically in Figure 11 and physically in Figure 12, allows

implementation and testing of the LT6411 with a variety

of different Linear Technology high speed ADCs.

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