ml6421 Microsemi Corporation, ml6421 Datasheet

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ml6421

Manufacturer Part Number
ml6421
Description
Triple Phase Sinx/x Equalized, Low-pass Video Filter
Manufacturer
Microsemi Corporation
Datasheet

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GENERAL DESCRIPTION
The ML6421 monolithic BiCMOS 6th-order filter provides
fixed frequency low pass filtering for video applications.
This triple phase-equalized filter with Sinx/x correction is
designed for reconstruction filtering at the output of a
Video DAC.
Cut-off frequencies are either 5.5, 8.0, or 3.0MHz. Each
channel incorporates a 6th-order lowpass filter, a first
order all-pass filter, a gain boost circuit, and a 75
cable driver. A control pin (Range) is provided to allow
the inputs to swing from 0 to 1V, or 0.5 to 1.5V, by
providing a 0.5V offset to the input.
The unity gain filters are powered from a single 5V supply,
and can drive 1V
over 150
BLOCK DIAGRAM
(0.5V to 2.5V) with the internal coax drivers.
FilterA
Filter B
Filter C
P-P
RANGE
over 75
V
V
V
IN
IN
IN
A
B
C
15
16
14
2
3k
1k
3k
1k
3k
1k
ML6221-1
(0.5V to 1.5V), or 2V
5.5MHz
5.5MHz
5.5MHz
I
I
I
BIAS
BIAS
BIAS
GND
BUF
BUF
BUF
12
V
CC
8
Triple Input/Anti-aliasing Video Filter
B
ML6421-3
8.0MHz
8.0MHz
8.0MHz
1x GAIN
Triple Phase and Sinx/x Equalized,
GNDA
LOW PASS
LOW PASS
LOW PASS
13
FILTER A
FILTER B
FILTER C
P-P
coax
V
CC
6
ML6421-4
C
8.0MHz
3.0MHz
3.0MHz
FILTER
FILTER
FILTER
PASS
PASS
PASS
ALL
ALL
ALL
FEATURES
GNDC
V
4
CC
5
5.5, 8.0, 9.3, or 3.0MHz bandwidth
1x or 2x gain
6th-order filter with phase and amplitude equalizer
>40dB stopband rejection
No external components or clocks
±10% frequency accuracy over maximum supply
and temperature variation
<2% differential gain <2° differential phase
<25ns group delay variation
Drives 1V
5V ±10% operation
EQUALIZER
EQUALIZER
EQUALIZER
SINX/X
SINX/X
SINX/X
ML6421-5
Low-Pass Video Filter
P-P
5.5MHz
5.5MHz
5.5MHz
GNDB
1
V
CC
11
into 75 , or 2V
1X/2X
BUF
1X/2X
BUF
1X/2X
BUF
A
2x GAIN
GND
3
ML6421-7
9.3MHz
9.3MHz
9.3MHz
3.33k
3.33k
3.33k
*Some Packages Are Obsolete
10 V
9
7
P-P
V
V
OUT
OUT
OUT
into 150
A
B
C
ML6421*
September 1999
1

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ml6421 Summary of contents

Page 1

... GENERAL DESCRIPTION The ML6421 monolithic BiCMOS 6th-order filter provides fixed frequency low pass filtering for video applications. This triple phase-equalized filter with Sinx/x correction is designed for reconstruction filtering at the output of a Video DAC. Cut-off frequencies are either 5.5, 8.0, or 3.0MHz. Each channel incorporates a 6th-order lowpass filter, a first order all-pass filter, a gain boost circuit, and a 75 cable driver ...

Page 2

... Power supply for filter B: 4.5V to 5.5V Output of filter B. Drive is 1V OUT 75 (0.5V to 1.5V 150 (0.5V to 2.5V Output of filter A. Drive is 1V OUT 75 (0.5V to 1.5V 150 (0.5V to 2.5V). 2 ML6421 16-Pin Wide SOIC (S16W) GNDB GND 3 14 RANGE GNDC 4 13 GNDA V CC ...

Page 3

... ML6421(–5 to – 3.58 & 4.43 MHz V = 1.1V to 2.5V ML6421(–1 to – 3.58 & 4.43 MHz V = 0.8V to 1.5V ML6421(–5 to – 3.58 & 4.43 MHz Range = 0 ML6421(–1 to –4) ML6421(–5 to –7) Range = 1 ML6421(–1 to –4) ML6421(-5 to -8) 2T, 0.7V pulse P 3.58, ML6421(–1 to – 4.43MHz ML6421(–5 to –7) IN ...

Page 4

... C –0.75dB (Note 5) ML6421(–1 to –4) –0.55dB (Note 5) ML6421(–5 to – 3.58MHz ML6421(–1 to –4) IN ML6421(–5 to – 4.43MHz ML6421(–1 to – ML6421(–5 to – 10MHz ML6421(–1 to –4) IN ML6421(–5 to – 50MHz 30MHz (Note 6) –3dB (Note ...

Page 5

... 30MHz (Note 6) –2dB (Note 9.82MHz 30MHz (Note 6) Range Range V = GND 0.5V (Note 1. order to improve step response. 2 /RL)] OUT ML6421 MIN TYP MAX UNITS 2.7 3 3.3 MHz 700 µV RMS 3 3.3 3.6 MHz ...

Page 6

... Figure 2. Stop-Band Amplitude vs Frequency –1 –2 –3 –4 –5 –6 –7 –8 10M 100M Figure 4. Pass-Band Amplitude vs Frequency 0 1M 10M FREQUENCY (Hz 8.0MHz ML6421-5 0 ML6420-5 100K 1M FREQUENCY (Hz 5.5MHz). C 100M 10M ...

Page 7

... Figure 6. Group Delay vs Frequency 232 222 212 202 192 182 172 162 152 142 132 100K Figure 8. Group Delay vs Frequency ML6421 ML6421-5 ML6421 FREQUENCY (MHz 5.5MHz). C 3.5MHz 7MHz FREQUENCY (Hz 3.0MHz ...

Page 8

... Sinx/x equalizer and an output amplifier capable of driving 75 to ground. The ML6421 can be driven by a DAC with Range down to 0V. When Range is low the input and output signal range is 0.5V to 2.5V. When the input signal includes 0V, Range should be tied high. In this case, an offset is added to the input so that the output swing is kept between 0 ...

Page 9

... ML6421-1 (5.5MHz) or ML6421-3 (8MHz) are appropriate depending on the sampling rate. YUV: When the luminance bandwidth is different from the A for color bandwidth, the ML6421-4 with the 8.0, and two CC 3.0MHz filters are most appropriate. S-Video: For Y/C (S-video) and Y (Composite Video) systems the 5.5MHz or 8MHz filters are appropriate ...

Page 10

... Y/C and CV sampling and 6.75MHz U/V sampling. Note: The ML6421 has the same pin-out as the ML6420 typical application the ML6421 is used as the final output device in a video processing chain. In this case, inputs to the ML6421 are supplied by DAC outputs with their associated load resistors (typically 75 Resistance values should be adjusted to provide 2V the input of the ML6421 ...

Page 11

... Figure 13. ML6421 Reconstruction Performance in the Time Domain Figure 14. Amplitude Ripple of Reconstructed Swept Pulses ML6421 11 ...

Page 12

... ML6421 PHYSICAL DIMENSIONS 0.400 - 0.414 (10.16 - 10.52) 16 PIN 0.024 - 0.034 (0.61 - 0.86) (4 PLACES) 0.012 - 0.020 0.090 - 0.094 (0.30 - 0.51) (2.28 - 2.39) 12 Package: S16W 16-Pin Wide SOIC 0.291 - 0.301 0.398 - 0.412 (7.39 - 7.65) (10.11 - 10.47) 0.050 BSC (1.27 BSC) 0.095 - 0.107 (2.41 - 2.72) 0º - 8º 0.022 - 0.042 0.005 - 0.013 SEATING PLANE (0.13 - 0.33) 0.009 - 0.013 (0.56 - 1.07) (0.22 - 0.33) ...

Page 13

... PART NUMBER ML6421CS-1 ML6421CS-3 ML6421CS-4 ML6421CS-5 ML6421CS-7 © Micro Linear 1999. property of their respective owners. Products described herein may be covered by one or more of the following U.S. 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; 5,559,470; 5,565,761; 5,592,128; 5,594,376; 5,652,479; 5,661,427; 5,663,874; 5,672,959; 5,689,167; 5,714,897; 5,717,798; 5,742,151; ...

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