BLOCK DIAGRAM

1

February 1997

PRELIMINARY

ML6424

CCIR601 Video Lowpass Filter

with Optional Sinx/x Correction

GENERAL DESCRIPTION

The ML6424 is a monolithic BiCMOS Video Lowpass

Filter IC, incorporating a 5th order Elliptic (Cauer) lowpass

filter, a third order allpass filter, and a 75

Ω coax cable

driver. The ML6425 additionally provides sinx/x amplitude

correction. These active lowpass filters are available with

a 2.75MHz (-2) or a 5.50MHz (-1) cutoff frequency.

The input signal can be either AC or DC coupled under

the control of the MODE pin. In the DC coupled case, a

control pin (RANGE) is provided to allow the inputs to

swing down to ground. Internal self clamping is provided

for AC coupled signals.

The ML6424 and ML6425 are powered by a single 5V

from 0.5V to 2.5V allows easy interface to the ML6400

family of A/D converters.

*Some packages Are Obsolete

FEATURES

s

External or internal input clamping with pulse output

for synchronous clamping of multiple filters

s

s

±0.25dB ripple

s

s

s

s

Group delay distortion:

s

<1% peak overshoot and ringing on 2T test pulse

s

0.5% diff. gain and 0.5

⋅ diff. phase typical

s

THD <1% at 3.58 or 4.43MHz

s

Programmable input-output gain of 1x or 2x

s

5V

±5% operation

+5V

GAIN

10k

Ω

1%

GND

GND

GND

MODE

PULSE

I/O

15

16

7

6

13

8

5

11

3

1

9

10

14

2

12

4

+

–

+

–

5TH ORDER

LOW PASS

INPUT

CLAMP

PULSE

CONTROL

3RD ORDER

ALL PASS

FILTER BIAS

RANGE

BUF

BUF

SINX/X

ML6424-1

ML6424-2

ML6425-1

ML6425-2

Bandwidth

5.50MHz

2.75MHz

5.50MHz

2.75MHz

Sinx/x

No

No

Yes

Yes