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

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ML6424-1

Manufacturer Part Number
ML6424-1
Description
CCIR601 Video Lowpass Filter with Optional Sinx/x Correction
Manufacturer
MICRO-LINEAR [Micro Linear Corporation]
Datasheet
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
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
2V
from 0.5V to 2.5V allows easy interface to the ML6400
family of A/D converters.
BLOCK DIAGRAM
PP
into 150 (0.5 to 2.5V). The maximum output swing
Bandwidth
Sinx/x
MODE
V
PULSE
V
IN
IN
I/O
M
P
PP
12
6
7
4
into 75
CONTROL
CLAMP
INPUT
PULSE
(0.5V to 1.5V), or
ML6424-1
5.50MHz
No
RANGE
+
GAIN
BUF
coax cable
13
8
with Optional Sinx/x Correction
5TH ORDER
LOW PASS
5
V
CC
9
CCIR601 Video Lowpass Filter
R
10k
1%
ML6424-2
2.75MHz
No
EXT
11
V
3RD ORDER
FILTER BIAS
FEATURES
CC
ALL PASS
10
+5V
External or internal input clamping with pulse output
for synchronous clamping of multiple filters
Frequency tunable with R
>40dB attenuation at f > 1.45 x f
>35dB attenuation at f > 1.45 x f
–12dB attenuation at f = 1.23 x f
Group delay distortion: 20ns up to 0.9 x f
<1% peak overshoot and ringing on 2T test pulse
0.5% diff. gain and 0.5 diff. phase typical
THD <1% at 3.58 or 4.43MHz
Programmable input-output gain of 1x or 2x
5V 5% operation
GND
0.25dB ripple
3
V
CC
14
ML6425-1
5.50MHz
Yes
GND
SINX/X
ML6424*/ML6425*
1
V
CC
2
GND
+
BUF
*Some packages Are Obsolete
EXT
: 10%
ML6425-2
2.75MHz
Yes
C
C
C
15
16
(w/o sinx/x)
(with sinx/x)
V
V
OUT
OUT
P
M
February 1997
PRELIMINARY
C
1

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ML6424-1 Summary of contents

Page 1

... 5TH ORDER 3RD ORDER BUF LOW PASS ALL PASS – FILTER BIAS RANGE GND EXT 10k 1% ML6424-1 ML6424-2 5.50MHz 2.75MHz No No ML6424*/ML6425* : 10% EXT (w/o sinx/x) C (with sinx/ *Some packages Are Obsolete ...

Page 2

... ML6424/ML6425 PIN CONFIGURATION 2 Package: S16W 16-Pin SOIC OUT GND OUT V GND PULSE I/O GAIN MODE GND RANGE EXT TOP VIEW M P ...

Page 3

... PULSE SELECT Input Internally biased Low 1V Output Float 1V High 1V ML6424/ML6425 Description Input coupling mode control pin. When MODE is low, U/V signal can be applied through an external ac coupling capacitor When IN MODE is high, Y signal can be applied through an external AC coupling capacitor this case, an ...

Page 4

... Differential Phase (RANGE = High) Dynamic Input Signal Range (MODE = Float) RANGE = Low Output Noise (GAIN = High) Corner Frequency ( 0.25dB) C Stopband Loss (ML6424-1, -2) Stopband Loss (ML6425-1, -2) Peak Overshoot and Ringing Composite Chroma/Luma Delay Output Short Circuit Current Load Capacitance Logic Input Low (V ...

Page 5

... Good high frequency decoupling is required between each power supply pin and ground, otherwise oscillations and/or excessive crosstalk may occur. ML6424 ...

Page 6

... ML6424/ML6425 6 ML6424 +5V MODE 12 4 PULSE I/O ML6424 MODE 12 4 PULSE I/O Figure 3. Y/C Filter ...

Page 7

... ML6424-1 RESPONSE CURVES +10 0 –10 –20 –30 –40 –50 –60 –70 –80 –90 0.1 1 FREQUENCY (MHz) Figure 4. Amplitude vs Frequency 0˚ 500k FREQUENCY (Hz) Figure 6. Phase vs Linear Frequency 380 360 340 320 300 280 100k 3M FREQUENCY (Hz) Figure 8. Group Delay vs Frequency +0.3 +0.2 +0.1 0.0 –0.1 –0.2 –0.3 –0.4 – ...

Page 8

... ML6424/ML6425 ML6424-2 RESPONSE CURVES +10 0 –10 –20 –30 –40 –50 –60 –70 –80 –90 0.1 1 FREQUENCY (MHz) Figure 9. Amplitude vs Frequency 0˚ 200k FREQUENCY (Hz) Figure 11. Phase vs Linear Frequency 730 690 650 610 570 530 100k 1.5M FREQUENCY (Hz) Figure 13. Group Delay vs Frequency 8 +0.4 +0.3 +0.2 +0.1 0.0 –0.1 –0.2 –0.3 – ...

Page 9

... FREQUENCY (Hz) Figure 16. Phase vs Frequency 410 390 370 350 330 310 290 270 250 230 210 100k 3.5M FREQUENCY (Hz) Figure 18. Group Delay vs Frequency +4dB 3.0 2.0 1.0 10M 5.5M Figure 17. Deviation from Linear Phase 6M ML6424/ML6425 0 0 FREQUENCY (MHz) Figure 15. Amplitude vs Frequency 0˚ 500k FREQUENCY (Hz) 5.5M 9 ...

Page 10

... FREQUENCY (Hz) Figure 21. Phase vs Linear Frequency 630 100k FREQUENCY (Hz) Figure 23. Group Delay vs Frequency 100k 10M Figure 20. Amplitude vs Frequency 200k 2.2M Figure 22. Deviation from Linear vs Phase 3.0M 8 6.0M FREQUENCY (Hz) 2.2M FREQUENCY (Hz) ML6424/25-1 ML6424/25 REXT (k) Figure 24. Frequency vs R EXT ...

Page 11

... ML6425-2 RESPONSE CURVES TIME (500ns/div.) Figure 25. Transient Response INPUT FROM DAC OUTPUT FILTER OUTPUT ML6424/ML6425 11 ...

Page 12

... ORDERING INFORMATION PART NUMBER FREQ ML6424-1 ML6424-2 ML6425-1 ML6425-2 © Micro Linear 1997 is a registered trademark of Micro Linear Corporation Products described herein may be covered by one or more of the following patents: 4,897,611; 4,964,026; 5,027,116; 5,281,862; 5,283,483; 5,418,502; 5,508,570; 5,510,727; 5,523,940; 5,546,017; ...

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