THS7360 datasheet(28/43 Pages) TI

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75 W

S-VideoY'1Out

CVBS1Out

CVBS

S-Video Y’

S-Video C’

Y'/G'

SD1OUT

SD2OUT

SD3OUT

DisableSD

GND

DisableHD

SF1OUT

SF2OUT

SF3OUT

BypassSF

SD1IN

SD2IN

SD3IN

S+

SF1IN

SF2IN

SF3IN

BypassSD

THS7360

Bypass

SDLPF

Bypass

SFLPF

P' /B'

P' /R'

75 W

S-VideoC'1Out

75 W

Y'/G'1Out

75 W

P’ /B'1Out

75 W

P' /R'1Out

75 W

S-VideoY'1Out

CVBS1Out

75 W

S-VideoC'1Out

75 W

Y'/G'1Out

75 W

P' /B'1Out

75 W

P’ /R'1Out

75 W

+2.7Vto

+5V

DisableSF

DisableSD

THS7360

SLOS674 – JUNE 2010

www.ti.com

(1) SF indicates selectable filter.

Figure 47. Typical Six-Channel System with DC-Coupled Line Driving and Two Outputs Per Channel

One concern of dc-coupling arises, however, if the

but power and thermal analysis should always be

line is terminated to ground. If the ac-bias input

examined in any system to ensure that no issues

configuration is used, the output of the THS7360 has

arise.

sure

use

RMS

power

and

not

a dc bias on the output, such as 1.6 V. With two lines

instantaneous power when evaluating the thermal

terminated to ground, this configuration allows a dc

performance.

current path to flow, such as 1.6 V/75

Ω = 21.3 mA.

Note that the THS7360 can drive the line with

The result of this configuration is a slightly decreased

dc-coupling

regardless

the

input

mode

high-output voltage swing and an increase in power

operation. The only requirement is to make sure the

dissipation of the THS7360. While the THS7360 was

video line has proper termination in series with the

designed to operate with a junction temperature of up

output (typically 75

Ω). This requirement helps isolate

to +125°C, care must be taken to ensure that the

capacitive loading effects from the THS7360 output.

junction temperature does not exceed this level or

Failure to isolate capacitive loads may result in

else long-term reliability could suffer. Using a 5-V

instabilities with the output buffer, potentially causing

supply, this configuration can result in an additional

ringing

oscillations

appear.

The

stray

dc power dissipation of (5 V – 1.6 V) × 21.3 mA =

capacitance that appears directly at the THS7360

72.5 mW per channel. With a 3.3-V supply, this

output pins should be kept below 20 pF for the fixed

dissipation reduces to 36.2 mW per channel. The

SD filter channels and below 15 pF for the selectable

overall low quiescent current of the THS7360 design

minimizes potential thermal issues even when using

the TSSOP package at high ambient temperatures,

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