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PDF ML6424-1 Data sheet ( Hoja de datos )
| Número de pieza | ML6424-1 | |
| Descripción | CCIR601 Video Lowpass Filter with Optional Sinx/x Correction | |
| Fabricantes | Micro Linear | |
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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 1VPP into 75Ω (0.5V to 1.5V), or
2VPP 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 REXT: ±10%
s ±0.25dB ripple
s >40dB attenuation at f > 1.45 x fC (w/o sinx/x)
s >35dB attenuation at f > 1.45 x fC (with sinx/x)
s –12dB attenuation at f = 1.23 x fC
s Group delay distortion: ±20ns up to 0.9 x fC
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
VIN M 7
INPUT
CLAMP
+
BUF
–
5TH ORDER
LOW PASS
3RD ORDER
ALL PASS
SINX/X
+
BUF
–
15 VOUT 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
1 page  
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 1.5µ, 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 75Ω 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
ML6424/ML6425
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 75Ω load, or 17mA peak into a 150Ω load. Load
resistance less than 75Ω and/or output voltage above 1.5V
into 75Ω (2.5V into 150Ω) 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.
ML6424-1
1µF
Y 6 VIN P
75Ω
7 VIN M
+5V 12 MODE
4 PULSE I/O
ML6424-1
1µF
Y 6 VIN P
75Ω
7 VIN M
+5V 12 MODE
4 PULSE I/O
ML6424-2
1µF
U 6 VIN P
75Ω
7 VIN M
12 MODE
4 PULSE I/O
ML6424-2
1µF
U 6 VIN P
75Ω
7 VIN M
12 MODE
4 PULSE I/O
ML6424-2
1µF
V 6 VIN P
75Ω
7 VIN M
12 MODE
4 PULSE I/O
Figure 1. YUV Filter with Sync on Y Input
and Auto Clamp On
ML6424-2
1µF
V 6 VIN P
75Ω
7 VIN M
12 MODE
4 PULSE I/O
Figure 2. YUV Filter with External Sync for U/V
5
5 Page 
ML6425-2 RESPONSE CURVES
INPUT FROM
DAC OUTPUT
FILTER
OUTPUT
TIME (500ns/div.)
Figure 25. Transient Response
ML6424/ML6425
11
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet ML6424-1.PDF ] | |
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