ML6424 Datasheet, PDF (1/12 Pages) Micro Linear Corporation – CCIR601 Video Lowpass Filter with Optional Sinx/x Correction

February 1997
PRELIMINARY
ML6424*/ML6425*
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 75Ω 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
supply, and can drive 1V_PP into 75Ω (0.5V to 1.5V), or
2V_PP into 150Ω (0.5 to 2.5V). The maximum output swing
from 0.5V to 2.5V allows easy interface to the ML6400
family of A/D converters.
FEATURES
s External or internal input clamping with pulse output
for synchronous clamping of multiple filters
s Frequency tunable with R_EXT: ±10%
s ±0.25dB ripple
s >40dB attenuation at f > 1.45 x f_C (w/o sinx/x)
s >35dB attenuation at f > 1.45 x f_C (with sinx/x)
s –12dB attenuation at f = 1.23 x f_C
s Group delay distortion: ±20ns up to 0.9 x f_C
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
*Some packages Are Obsolete
BLOCK DIAGRAM
GAIN
13
VCC
5
+5V
VCC
11
VCC
3
VCC
1
VIN P ₆
V_IN M ₇
INPUT
CLAMP
+
BUF
–
5TH ORDER
LOW PASS
3RD ORDER
ALL PASS
SINX/X
+
BUF
–
15 V_OUT P
16 ^{VOUT M}
MODE ¹²
PULSE ⁴
I/O
PULSE
CONTROL
8
RANGE
FILTER BIAS
9
REXT
10kΩ
1%
10
GND
14
GND
2
GND
Bandwidth
Sinx/x
ML6424-1
5.50MHz
No
ML6424-2
2.75MHz
No
ML6425-1
5.50MHz
Yes
ML6425-2
2.75MHz
Yes
1