OPA360 datasheet(11/24 Pages) TI1

11 / 24 page

OPA360

SB0S294E − DECEMBER 2003 − REVISED SEPTEMBER 2006

www.ti.com

SUPPLY VOLTAGE vs COUPLING CAPACITOR

The output voltage swing is a function of the coupling

capacitor value. The value of the sag correction capacitor

has only a minor influence. The smaller the coupling

capacitor, the greater the output swing. Therefore, to

accommodate the large signal swing with very small

coupling capacitors (22

µF and 33µF), a higher supply

voltage might be needed.

Figure 12. Output Swing with 47

mF on 3V Supply

As seen in Figure 7, the output swing with a 33

µF coupling

capacitor is already very close to the saturation limit on a

3V supply. Over time and temperature, a capacitor might

change its value slightly, which in turn could force the

output into saturation. Using the 50Hz, 1/2 black

1/2

white screen test signal as a worst-case analysis,

Figure 12 and Figure 13 demonstrate that a 3V supply

could be used with a coupling capacitor as low as 47

µF.

Figure 13. Output Swing with 67

mF on 3V Supply

OUT

µF

OUT

Ω

GND

Ω

OUT

Enable

2−Pole

Filter

(1)

SAG

µF

AC Gain = 2

DC Gain = 2.8

Television

or VCR

OPA360

Video

DAC

NOTE: (1) Optional 200

Ωfor use with TI’s Digital Media Processors.

Level

Shifter

V+

V+ = 2.7V to 3.3V

ENABLE

Figure 14. DC-Coupled Input/AC-Coupled Output

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