THS3201D datasheet(15/29 Pages) TI

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THS3201

SLOS416A − JUNE 2003 − REVISED JANUARY 2004

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SINGLE SUPPLY OPERATION

The THS3201 has the capability to operate from a single

supply voltage ranging from 6.6V to 15V. When operating

from a single power supply, care must be taken to ensure

the input signal and amplifier is biased appropriately to

allow for the maximum output voltage swing. The circuits

shown in Figure 52 demonstrate methods to configure an

amplifier in a manner conducive for single supply

operation

THS3201

49.9

Ω

Ω Source

+VS

768

Ω

768

Ω

+VS

THS3201

287

Ω

Ω Source

576

Ω

+VS

60.4

Ω

49.9

Ω

49.9

Ω

Figure 52. DC-Coupled Single Supply Operation

VIDEO AND HDTV DRIVERS

The exceptional bandwidth and slew rate of the THS3201

matches the demands for professional video and HDTV.

Most commercial HDTV standards requires a video

passband of 30-MHz. To ensure high signal quality with

minimal degradation of performance, a 0.1-dB gain

flatness should be at least 7x the passband frequency to

minimize group delay variations—requiring 210-MHz

0.1-dB frequency flatness from the amplifier. High slew

rates ensures there is minimal distortion of the video

signal. Component video and RGB video signals require

fast transition times and fast settling times to keep a high

signal quality. The THS8135, for example, is a 240 MSPS

video DAC and has a transition time approaching 4-ns.

The THS3201 is a perfect candidate for interfacing the

output of such high-performance video components.

−

Ω

n Lines

VO(1)

VO(n)

THS3201

75-

Ω Transmission Line

768

Ω

768

Ω

±7.5 V

Figure 53. Video Distribution Amplifier

Application

ADC DRIVER APPLICATION

The THS3201 can be used as a high-performance ADC

driver in applications like radio receiver IF stages, and test

and measurement devices. All high-performance ADCs

have differential inputs. The THS3201 can be used in

conjunction with a transformer as a drive amplifier in these

applications. Figure 54 and Figure 55 show two different

approaches.

In Figure 54, a transformer is used after the amplifier to

convert the signal to differential. The advantage of this

approach is fewer components are required. ROUT and RT

are required for impedance matching the transformer.

THS3201

47pF

ADC

47pF

1:n

24.9

Ω

VS+

VS−

VIN

0.1

µF

0.1

µF

24.9

Ω

ROUT

0.1

µF

Figure 54. Differential ADC Driver Circuit 1

In Figure 55, a transformer is used before two amplifiers to

convert the signal to differential. The two amplifiers then

amplify the differential signal. The advantage to this

approach is each amplifier is required to drive half the

voltage as before. RT is used to impedance match the

transformer.

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