ML6424-1 MICRO-LINEAR [Micro Linear Corporation], ML6424-1 Datasheet - Page 5

• Manufacturer Part Number: ML6424-1
• Description: CCIR601 Video Lowpass Filter with Optional Sinx/x Correction
• Manufacturer: MICRO-LINEAR [Micro Linear Corporation]

FUNCTIONAL DESCRIPTION
The ML6424 and ML6425 are monolithic CCIR601
continuous time video filters, designed for broadcast and
professional luminance and chrominance antialias and
reconstruction applications. They are fabricated using
Micro Linear’s 1.5 , 4 GHz BiCMOS process. The filter
incorporates an input amplifier, programmable gain of 1x
or 2x set by the GAIN pin, a fifth order lowpass filter, a
third order allpass filter, and an output amplifier capable
of driving 75 to ground. The ML6425 provides sinx/x
equalization.
The ML6424–1 is intended for application as luminance
antialias processing, the ML6424–2 for chrominance
antialias, the ML6425–1 for luma reconstruction, and the
ML6425–2 for chroma reconstruction.
Input signals can be applied either through an AC coupling
capacitor (MODE = High/Low) or directly to the input pin
(MODE = float). With MODE = High, Y-Channel signal
Figure 1. YUV Filter with Sync on Y Input
U
75
75
V
75
Y
and Auto Clamp On
1 F
1 F
1 F
+5V
12
12
12
6
7
4
6
7
4
6
7
4
MODE
MODE
MODE
V
V
V
V
V
V
PULSE I/O
PULSE I/O
PULSE I/O
IN
IN
IN
IN
IN
IN
ML6424-1
ML6424-2
ML6424-2
P
M
P
M
P
M
can be applied to the input and the PULSE I/O pin
generates a clamping pulse for the U/V channel. When
MODE = Low, U/V channel signal can be applied to the
input. In this case, the PULSE I/O pin can take the pulse
signal generated from the PULSE I/O pin of the other chip
in the Y-channel. In the case of direct coupling, RANGE
should be adjusted according to the input signal range.
When RANGE is low, the input signal range is 0.5V to
1.5V. When the input signal goes down to 0V, RANGE
should be tied high. In this case, an offset is added to the
input so that the filter can process the 0V DC level.
The output amplifier is designed to drive up to 20mA peak
into a 75 load, or 17mA peak into a 150
resistance less than 75 and/or output voltage above 1.5V
into 75 (2.5V into 150 ) may cause signal distortion.
Good high frequency decoupling is required between
each power supply pin and ground, otherwise oscillations
and/or excessive crosstalk may occur.
Figure 2. YUV Filter with External Sync for U/V
U
Y
75
75
V
75
1 F
1 F
1 F
+5V
12
12
12
6
7
4
6
7
4
6
7
4
ML6424/ML6425
V
V
MODE
V
V
MODE
V
V
MODE
PULSE I/O
PULSE I/O
PULSE I/O
ML6424-1
ML6424-2
ML6424-2
IN
IN
IN
IN
IN
IN
P
M
P
M
P
M
load. Load
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