Triple/Dual Phase-Equalized, Low-Pass Video Filter
GENERAL DESCRIPTION
The ML6420 monolithic BiCMOS 6th-order filters provide
fixed frequency low pass filtering for video applications.
These triple output phase-equalized filters are designed for
input anti-aliasing filtering.
Cut-off frequencies are either 3.0, 5.5, 8.0, or 9.3MHz.
Each channel incorporates a 6th-order low-pass filter, a
first order all-pass filter, and a 75W coax cable driver. A
control pin (Range) is provided to allow the inputs to
swing to ground by providing a 0.5V offset to
the input.
The filters are powered from a single 5V supply, and can
drive 1V
P-P
over 75W (0.5V to 1.5V), or 2V
P-P
over 150W
(0.5V to 2.5V).
FEATURES
s
s
s
s
s
s
3.0, 5.5, 8.0, or 9.3 MHz bandwidth
1X or 2X gain
6th-order filter with equalizer
>40dB stopband rejection
No external components or clocks
±10% maximum frequency accuracy over supply
and temperature
<2% differential gain, <2° differential phase
<25ns group delay variation
5V ±10% operation
ML6420 available with 6dB gain
Drives 1V
P-P
into 75
W
, or 2V
P-P
into 150
W
s
s
s
s
s
* Some Packages Are End Of Life
ML 6420 BLOCK DIAGRAM
V
CC
B
8
V
CC
C
6
V
CC
5
V
CC
A
11
V
IN
A 15
3k
BUF
LOW PASS
A
ALL PASS
A
1X/2X
BUF
3.33K
10 V
OUT
A
I
BIAS
1k
V
IN
B 16
3k
BUF
LOW PASS
B
ALL PASS
B
1X/2X
BUF
3.33K
9
V
OUT
B
I
BIAS
1k
LOW PASS
C
I
BIAS
RANGE 14
1k
12
GND
13
GNDA
4
GNDC
1
GNDB
3
GND
ALL PASS
C
V
IN
C 2
3k
BUF
1X/2X
BUF
3.33K
7
V
OUT
C
1X GAIN
ML6420-1
FILTER A
FILTER B
FILTER C
5.5MHZ
5.5MHZ
5.5MHZ
2X GAIN
ML6420-4
8.0MHZ
3.0MHZ
3.0MHZ
ML6420-3
8.0MHZ
8.0MHZ
8.0MHZ
ML6420-5
5.5MHZ
2.5MHZ
2.5MHZ
ML6420-7
9.3MHZ
9.3MHZ
9.3MHZ
Triple Input/Anti-aliasing Video Filter
1
ML6420
PIN CONFIGURATION
ML6420
16-Pin Wide SOIC (S16W)
GNDB
VINC
GND
GNDC
VCC
VCCC
VOUTC
VCCB
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
VINB
VINA
RANGE
GNDA
GND
VCCA
VOUTA
VOUTB
TOP VIEW
PIN DESCRIPTION
PIN
NAME
FUNCTION
PIN
NAME
FUNCTION
1
2
3
4
5
6
7
GNDB
V
IN
C
GND
GNDC
V
CC
V
CC
C
V
OUT
C
Ground pin for filter B
Signal input to filter C. Input
impedance is 4k
W
.
Power and logic ground
11
12
13
14
V
CC
A
GND
GNDA
RANGE
Power supply voltage for filter A.
Power and logic ground.
Ground pin for filter A.
Input signal range select. For -1 to -4;
when RANGE is low (0), the input
signal range is 0.5V to 2.5V, with an
output range of 0.5V to 2.5V. When
RANGE is high (1) the input signal
range is 0V to 2V, with an output range
of 0.5V to 2.5V. For -5 to -12; when
RANGE is low (0), the input signal
range is 0.5V to 1.5V, with an output
range of 0.5V to 2.5V. When RANGE is
high (1) the input signal range is 0V to
1V, with an output range of 0.5V to
2.5V.
Signal input to filter A. Input
impedance is 4k
W
.
Signal input to filter B. Input
impedance is 4k
W
.
Ground pin for filter C.
Positive supply for bias circuit.
Power supply voltage for filter C.
Output of filter C. Drive is 1V
P-P
into
75
W
(0.5V to 1.5V) or 2V
P-P
into 150
W
(0.5V to 2.5V).
Power supply voltage for filter B.
Output of filter B. Drive is 1V
P-P
into
75
W
(0.5V to 1.5V) or 2V
P-P
into 150
W
(0.5V to 2.5V).
Output of filter A. Drive is 1V
P-P
into
75
W
(0.5V to 1.5V) or 2V
P-P
into 150
W
(0.5V to 2.5V).
15
16
V
IN
A
V
IN
B
8
9
V
CC
B
V
OUT
B
10
V
OUT
A
2
ML6420
ABSOLUTE MAXIMUM RATINGS
Absolute maximum ratings are those values beyond which
the device could be permanently damaged. Absolute
maximum ratings are stress ratings only and functional
device operation is not implied.
Supply Voltage (V
CC
) ...................................... –0.3 to 7V
GND .................................................. –0.3 to V
CC
+0.3V
Logic Inputs ......................................... –0.3 to V
CC
+0.3V
Input Current per Pin ............................................ ±25mA
Storage Temperature .................................. –65° to 150°C
Package Dissipation at T
A
= 25°C ............................... 1W
Lead Temperature (Soldering 10 sec) ...................... 260°C
Thermal Resistance (q
JA
) ...................................... 65°C/W
OPERATING CONDITIONS
Supply Voltage ................................................. 5V ± 10%
Temperature Range ........................................ 0°C to 70°C
ELECTRICAL CHARACTERISTICS
Unless otherwise specified, V
CC
= 5V ± 10%, T
A
= Operating Temperature Range, R
L
=75W or 150W, V
OUT
= 2V
P-P
for
150W Load and V
OUT
= 1V
P-P
for 75W Load (Notes 1-3)
SYMBOL
GENERAL
R
IN
DR/R
IN
I
BIAS
Input Impedance
Input R Matching
Input Current
ML6420 (–1 to –4)
Between filters A, B and C
V
IN
= 0.5V, range = low
V
IN
= 0.0V, range = high
ML6420
(–5 to–7)
Small Signal
Gain
Differential
Gain
Differential
Phase
V
IN
Input Range
ML6420 (–1 to –4)
ML6420
(–5 to –7)
ML6420 (–1 to –4)
ML6420
(–5 to –7)
ML6420 (–1 to –4)
ML6420
(–5 to –7)
ML6420 (–1 to –4)
V
IN
= 0.5V, range = low
V
IN
= 0.0V, range = high
V
IN
= 100mV
P-P
at 100kHz
V
IN
= 100mV
P-P
at 100kHz
V
IN
= 1.8V ± 0.7V at
3.58 & 4.43 MHz
V
IN
= 0.8V to 1.5V
V
IN
= 1.8V ± 0.7V at
3.58 & 4.43 MHz
V
IN
= 0.8V to 1.5V
RANGE = 0, Ground
RANGE = 1, V
CC
ML6420
(–5 to –7)
Peak Overshoot
Crosstalk
ML6420 (–1 to –4)
ML6420
(–5 to –7)
Channel to Channel
Group Delay Matching (f
C
= 5.5MHz)
Channel to Channel Gain Matching
RANGE = 0, Ground
RANGE = 1, V
CC
2T, 0.7V
P-P
pulse
f
IN
= 3.58, f
IN
= 4.43MHz
f
IN
= 3.58, f
IN
= 4.43MHz
f
IN
= 100kHz
Filters with identical f
C
f
IN
= 100kHz
50
45
±10
±2
0.5
0.0
0.5
0.0
2.0
–0.5
5.5
–80
–125
45
–210
0
6
1
1
1
1
2.5
2.0
1.5
1.0
0.5
6.5
3
4
5
±2
k
W
%
µA
µA
µA
µA
dB
dB
%
%
deg
deg
V
V
V
V
%
dB
dB
ns
%
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
3
ML6420
ELECTRICAL CHARACTERISTICS
(Continued)
SYMBOL
GENERAL
(Continued)
Output Current
C
L
Load Capacitance
Composite
Chroma/Luma
Delay At 3.58
& 4.43MHz
3.0/3.3MHZ FILTER – ML6420
Bandwidth (monotonic passband)
–3dB (3.0MHz)
–3dB (3.3MHz)
Stopband Attenuation
f
IN
= 9.82MHz (3.0MHz)
f
IN
= 9.82MHz (3.3MHz)
f
IN
= 60MHz
Output Noise
Group Delay
5.50MHZ FILTER – ML6420-1
Bandwidth (monotonic passband)
Stopband Attenuation
–3dB
f
IN
= 10MHz
f
IN
= 50MHz
Output Noise
Group Delay
8.0MHZ FILTER – ML6420
Bandwidth (monotonic passband)
Stopband Attenuation
–3dB
f
IN
= 17MHz
f
IN
= 85MHz
Output Noise
Group Delay
BW = 30MHz
120
7.2
20
40
8.0
25
42
700
µV
RMS
ns
8.8
MHz
dB
BW = 30MHz
145
4.95
16
40
5.50
18
45
700
6.05
MHz
dB
dB
µV
RMS
ns
BW = 30MHz
225
2.7
3.0
30
35
43
3.0
3.3
33
40
50
490
3.3
3.6
MHz
MHz
dB
dB
dB
µV
RMS
ns
ML6420 (–5 to –7)
ML6420 (–1 to –4)
f
C
= 5.5MHz
f
C
= 8.0MHz
f
C
= 5.5MHz
f
C
= 9.3MHz
±10
±8
±15
±8
R
L
= 0 (short circuit)
75
35
mA
pF
ns
ns
ns
ns
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
4
ML6420
ELECTRICAL CHARACTERISTICS
(Continued)
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
5.50MHZ FILTER – ML6420-5
Bandwidth (monotonic passband)
Attenuation
f
IN
= 10MHz
f
IN
= 50MHz
Output Noise
Group Delay
Small Signal Gain
CV
Composite Small Signal Gain
V
IN
= 100mV
P-P
at 100kHz,
Filter A or C
V
IN
A, C = 100mV
P-P
at 100kHz
BW = 30MHz
170
5.5
11
6
12
–3dB (Note 5)
4.95
20
45
5.50
25
55
1
ns
6.5
13
dB
dB
6.05
MHz
dB
dB
mV
RMS
9.3MHZ FILTER – ML6420-7
Bandwidth (monotonic passband)
Attenuation
f
IN
= 17MHz
f
IN
= 85MHz
Output Noise
Group Delay
DIGITAL AND DC
V
IL
V
IH
I
IL
I
IL
I
CC
Logic Input Low
Logic Input High
Logic Input Low
Logic Input High
Supply Current R
L
= 75W
RANGE
RANGE
V
IN
= GND
V
IN
= V
CC
V
IN
= 0.5V (Note 4)
V
IN
= 1.5V
110
150
V
CC
– 0.8
–1
1
135
175
0.8
V
V
µA
µA
mA
mA
BW = 30MHz
100
–3dB (Note 5)
8.4
20
45
9.3
25
55
1
ns
10.2
MHz
dB
dB
mV
RMS
Note 1:
Limits are guaranteed by 100% testing, sampling, or correlation with worst case test conditions.
Note 2:
Maximum resistance on the outputs is 500
W
in order to improve step response.
Note 3:
Connect all ground pins to the ground plane via the shortest path.
Note 4:
Power dissipation P
D
= (I
CC
´
V
CC
) – [3 (V
OUT2
/R
L
)]
Note 5:
The bandwidth is the –3dB frequency of the unboosted filter. This represents the attenuation that results from boosting the gain from -3dB point at the
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