MAX9513 데이터 시트보기 (PDF) - Maxim Integrated

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MAX9513

CVBS Video Filter Amplifier with SmartSleep and Bidirectional Video Support

Maxim Integrated 

CVBS Video Filter Amplifier with SmartSleep

and Bidirectional Video Support

Standby Mode

In standby mode, the filter and output amplifiers are off,

and only the active video detect circuit is operational.

Quiescent current consumption is approximately 7µA

(Figure 2). The active video detect circuit checks

whether sync is present on the CVBSIN signal. If no

sync is detected, the device remains in standby mode.

Active-Detect Mode

The active video detect circuit slices the CVBSIN signal

at 4.7% of the power supply (155mV for a 3.3V supply).

If the transitions occur at a rate of 14.3kHz or higher, a

video signal is present. When the MAX9513 detects a

video signal with sync at the CVBSIN input, the control

logic enters the active-detect mode and enables the

load-sense circuitry (Figure 3). The supply current is

typically 17µA.

If an output load is not connected to any amplifier, the

MAX9513 remains in active-detect mode. Eight times per

second, each load-sense circuit checks for a load by

connecting an internal 15kΩ pullup resistor to the output

for 1ms. If the output is pulled up, no load is present. If

the output stays low, a load is connected.

CURRENT

DAC

+3.3V

INT/EXT

SMARTSLEEP

SHDN

+3.3V

7μA

VDD

CONTROL

LOGIC

ACTIVE VIDEO

DETECT

CVBSIN

BUFFER

NO VIDEO

SIGNAL

LPF

OFF

EXTCVBSIN

OFF

+3.3V

CLAMP

OFF

GND

MAX9513

LOAD SENSE

OFF

6dB

OFF

CVBSOUT1 75Ω

LOAD SENSE

OFF

6dB

OFF

CVBSOUT2 75Ω

CVBS1

CVBS2

Figure 2. Standby Mode

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