ML6420
FUNCTIONAL DESCRIPTION
The ML6420 single-chip Dual/Triple Video Filter ICs are
intended for low cost professional and consumer video
applications. Each channel incorporates an input buffer
amplifier, a sixth order lowpass filter, a first order allpass
equalizer, and an output 1X or 2X gain amplifier capable
of driving 75
W
to ground.
When RANGE is low the input and output signal range is
0.5V to 1.5V. When the input signal range is 0V to 1V,
RANGE should be tied high. In this case, an offset is added
to the input so that the output swing is kept between 0.5V
to 1.5V. The output amplifier is capable of driving up to
24mA of peak current; therefore the output voltage should
not exceed 1.8V when driving 75
W
to ground. The
ML6420 can be driven by a DAC with swing down to 0V.
The summer output on the ML6422 is given by 2x(V
INA
+
V
INC
) – 2.5V when RANGE = 0 and 2x(V
INA
+ V
INC
) –
0.5V when RANGE is high. So, V
INA
and V
INC
should be
such that this output does not go below 0.5V or above
2.5V for proper operation.
6
MICRO-LINEAR [ MICRO LINEAR CORPORATION ]
