OPA362 datasheet(9/18 Pages) TI

9 / 18 page

12.5pF

1kW

4.22kW

1838W

2.5kW

OPA362

(

)

3.6pF

872W

75W

Television

OPA362

www.ti.com ........................................................................................................................................................................................ SBOS480 – SEPTEMBER 2009

Operating Voltage

Enable pin enables the op amp. The logic levels are

compatible with 1.8V CMOS logic levels. A valid logic

The OPA362 is fully specified from 2.5V to 3.3V over

high is defined as greater than 1.3V above GND. A

a temperature range of –40°C to +125°C. Parameters

valid logic low is defined as less than 0.5V above

that vary significantly with operating voltages or

GND. If the Enable pin is not connected, internal

temperature are shown in the Typical Characteristics.

pull-up circuitry enables the amplifier.

Power-supply pins should be bypassed with 100nF

ceramic capacitors.

When disabling the OPA362, internal circuitry also

disconnects the internal gain setting feedback. This

feature supports the TV-detection function; see the

Input Voltage

TV-Detect

Function

section

for

detailed

The input common-mode range of the OPA362 series

information.

extends from GND to 0.55V on a 3.3V supply. The

input range is limited by the internal gain in

Internal Two-Pole Filter

conjunction with the maximum output swing capability

and the power-supply voltage.

The OPA362 filter is a Sallen-Key topology with an

8.5MHz cutoff frequency. Figure 19 shows a detailed

drawing of the filter components. This filter allows

Input Overvoltage Protection

video signals to pass without any visible distortion, as

All OPA362 pins are static-protected with internal

shown in Figure 20 through Figure 23. The video

ESD protection diodes connected to the supplies.

encoder embedded in the OMAP343x processor

These diodes provide input overdrive protection if the

typically samples at 54MHz. At this frequency, the

current is externally limited to 10mA.

attenuation

typically

23dB,

which

effectively

attenuates the sampling aliases.

Enable/Shutdown

The internal 872

Ω resistor on the input to GND

The OPA362 has a shutdown feature that disables

converts the output current of the OMAP3430 internal

the output and reduces the quiescent current to less

video DAC into a voltage. It is also part of the

than 1.5

μA. This feature is especially useful for

Sallen-Key filter. Using an external resistor to adjust

portable video applications, where the device is

the input voltage range also changes the filter

infrequently connected to a television (TV) or other

characteristics.

video device.

The Enable logic input voltage is referenced to the

OPA362 GND pin. A logic level high applied to the

Figure 19. OPA362 Filter Structure

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