Micro Linear Corporation ML6420CS-3, ML6420CS-4, ML6420CS-5, ML6420CS-7, ML6420CS-1 Datasheet

September 1999

PRELIMINARY

ML6420*

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

over 75W (0.5V to 1.5V), or 2V

P-P

over 150W

P-P

(0.5V to 2.5V).

ML 6420 BLOCK DIAGRAM

V

B

CC

8

V

CC

6

FEATURES

■ 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

■ Drives 1V

■ 5V ±10% operation

■ ML6420 available with 6dB gain

* Some Packages Are End Of Life

C

V

CC

5

into 75W, or 2V

P-P

V

A

CC

11

into 150

P-P

W

V

IN

V

IN

V

IN

RANGE

15

A

3k

1k

B

16

3k

1k

2

C

3k

14

1k

I

I

I

BIAS

BIAS

BIAS

BUF

BUF

BUF

12

GND

LOW PASS

A

LOW PASS

B

LOW PASS

C

13

GNDA

ALL PASS

A

ALL PASS

B

ALL PASS

C

4

GNDC

1X/2X

BUF

1X/2X

BUF

1X/2X

BUF

1

GNDB

3

GND

3.33K

3.33K

3.33K

10

V

OUT

9

V

OUT

7

V

OUT

1X GAIN 2X GAIN

ML6420-1 ML6420-3 ML6420-4 ML6420-5 ML6420-7

FILTER A 5.5MHZ 8.0MHZ 8.0MHZ 5.5MHZ 9.3MHZ
FILTER B 5.5MHZ 8.0MHZ 3.0MHZ 2.5MHZ 9.3MHZ
FILTER C 5.5MHZ 8.0MHZ 3.0MHZ 2.5MHZ 9.3MHZ

A

B

C

Triple Input/Anti-aliasing Video Filter

1

ML6420

PIN CONFIGURATION

PIN DESCRIPTION

ML6420

16-Pin Wide SOIC (S16W)

CC

1

2

3

4

5

6

7

C

8

TOP VIEW

GNDB

VINC

GND

GNDC

VCCC

V

OUT

VCCB

V

16

VINB

15

VINA

14

RANGE

13

GNDA

12

GND

11

VCCA

10

V

A

OUT

9

V

B

OUT

PIN NAME FUNCTION

1 GNDB Ground pin for filter B

2VINC Signal input to filter C. Input

impedance is 4kW.

3 GND Power and logic ground

4 GNDC Ground pin for filter C.

5V

CC

Positive supply for bias circuit.

6VCCC Power supply voltage for filter C.

7V

C Output of filter C. Drive is 1V

OUT

75W (0.5V to 1.5V) or 2V

into 150

P-P

(0.5V to 2.5V).

8VCCB Power supply voltage for filter B.

9V

B Output of filter B. Drive is 1V

OUT

75W (0.5V to 1.5V) or 2V

into 150

P-P

(0.5V to 2.5V).

10 V

A Output of filter A. Drive is 1V

OUT

75W (0.5V to 1.5V) or 2V

into 150

P-P

(0.5V to 2.5V).

P-P

P-P

P-P

into

into

into

PIN NAME FUNCTION

11 VCCA Power supply voltage for filter A.

12 GND Power and logic ground.

13 GNDA Ground pin for filter A.

14 RANGE 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

W

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.

W

15 VINA Signal input to filter A. Input

impedance is 4kW.

16 VINB Signal input to filter B. Input

W

impedance is 4kW.

2

ABSOLUTE MAXIMUM RATINGS

ML6420

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 (VCC) ...................................... –0.3 to 7V

Storage Temperature .................................. –65° to 150°C

Package Dissipation at TA = 25°C............................... 1W

Lead Temperature (Soldering 10 sec) ...................... 260°C

Thermal Resistance (qJA) ...................................... 65°C/W

OPERATING CONDITIONS

GND .................................................. –0.3 to VCC +0.3V

Logic Inputs......................................... –0.3 to VCC +0.3V

Input Current per Pin ............................................±25mA

Supply Voltage ................................................. 5V ± 10%

Temperature Range ........................................0°C to 70°C

ELECTRICAL CHARACTERISTICS

Unless otherwise specified, VCC = 5V ± 10%, TA = Operating Temperature Range, RL =75W or 150W, V
150W Load and V

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

GENERAL

R

DR/R

I

BIAS

Input Impedance 3 4 5 k

IN

Input R Matching Between filters A, B and C ±2 %

IN

Input Current ML6420 (–1 to –4) VIN = 0.5V, range = low –80 µA

OUT

= 1V

for 75W Load (Notes 1-3)

P-P

VIN = 0.0V, range = high –125 µA

OUT

= 2V

P-P

for

W

ML6420 VIN = 0.5V, range = low 45 µA

(–5 to–7) VIN = 0.0V, range = high –210 µA

Small Signal ML6420 (–1 to –4) VIN = 100mV

Gain ML6420 VIN = 100mV

(–5 to –7)

Differential ML6420 (–1 to –4) V

Gain ML6420 V

(–5 to –7)

Differential ML6420 (–1 to –4) VIN = 1.8V ± 0.7V at 1 deg

Phase ML6420 VIN = 0.8V to 1.5V 1 deg

(–5 to –7)

V

Input Range ML6420 (–1 to –4) RANGE = 0, Ground 0.5 2.5 V

IN

ML6420 RANGE = 0, Ground 0.5 1.5 V

(–5 to –7) RANGE = 1, V

Peak Overshoot 2T, 0.7V

Crosstalk ML6420 (–1 to –4) fIN = 3.58, fIN = 4.43MHz 50 dB

= 1.8V ± 0.7V at 1 %

IN

3.58 & 4.43 MHz

= 0.8V to 1.5V 1 %

IN

3.58 & 4.43 MHz

RANGE = 1, V

at 100kHz –0.5 0 0.5 dB

P-P

at 100kHz 5.5 6 6.5 dB

P-P

CC

CC

pulse 2.0 %

P-P

0.0 2.0 V

0.0 1.0 V

ML6420 fIN = 3.58, fIN = 4.43MHz 45 dB
(–5 to –7)

Channel to Channel fIN = 100kHz ±10 ns
Group Delay Matching (fC = 5.5MHz) Filters with identical f

Channel to Channel Gain Matching fIN = 100kHz ±2 %

C

3

ML6420

ELECTRICAL CHARACTERISTICS (Continued)

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

GENERAL (Continued)

Output Current RL = 0 (short circuit) 75 mA

C

3.0/3.3MHZ FILTER – ML6420

5.50MHZ FILTER – ML6420-1

Load Capacitance 35 pF

L

Composite ML6420 (–1 to –4) fC = 5.5MHz ±10 ns

Chroma/Luma fC = 8.0MHz ±8 ns

Delay At 3.58 ML6420 (–5 to –7) fC = 5.5MHz ±15 ns

& 4.43MHz fC = 9.3MHz ±8 ns

Bandwidth (monotonic passband) –3dB (3.0MHz) 2.7 3.0 3.3 MHz

Stopband Attenuation fIN = 9.82MHz (3.0MHz) 30 33 dB

Output Noise BW = 30MHz 490 µV

Group Delay 225 ns

Bandwidth (monotonic passband) –3dB 4.95 5.50 6.05 MHz

Stopband Attenuation fIN = 10MHz 16 18 dB

–3dB (3.3MHz) 3.0 3.3 3.6 MHz

fIN = 9.82MHz (3.3MHz) 35 40 dB

fIN = 60MHz 43 50 dB

RMS

fIN = 50MHz 40 45 dB

Output Noise BW = 30MHz 700 µV

Group Delay 145 ns

8.0MHZ FILTER – ML6420

Bandwidth (monotonic passband) –3dB 7.2 8.0 8.8 MHz

Stopband Attenuation fIN = 17MHz 20 25 dB

Output Noise BW = 30MHz 700 µV

Group Delay 120 ns

RMS

fIN = 85MHz 40 42

RMS

4

ML6420

ELECTRICAL CHARACTERISTICS (Continued)

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

5.50MHZ FILTER – ML6420-5

Bandwidth (monotonic passband) –3dB (Note 5) 4.95 5.50 6.05 MHz

Attenuation fIN = 10MHz 20 25 dB

fIN = 50MHz 45 55 dB

Output Noise BW = 30MHz 1 mV

Group Delay 170 ns

Small Signal Gain V

= 100mV

IN

at 100kHz, 5.5 6 6.5 dB

P-P

Filter A or C

CV Composite Small Signal Gain VINA, C = 100mV

at 100kHz 11 12 13 dB

P-P

9.3MHZ FILTER – ML6420-7

Bandwidth (monotonic passband) –3dB (Note 5) 8.4 9.3 10.2 MHz

Attenuation fIN = 17MHz 20 25 dB

fIN = 85MHz 45 55 dB

Output Noise BW = 30MHz 1 mV

Group Delay 100 ns

DIGITAL AND DC

V

V

I

I

Logic Input Low RANGE 0.8 V

IL

Logic Input High RANGE VCC – 0.8 V

IH

Logic Input Low VIN = GND –1 µA

IL

Logic Input High VIN = V

IL

CC

1µA

ICCSupply Current RL = 75W VIN = 0.5V (Note 4) 110 135 mA

VIN = 1.5V 150 175 mA

RMS

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 500W 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
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

specified frequency.

= (ICC ´ VCC) – [3 (V

D

OUT

2

/RL)]

5

ML6420

FUNCTIONAL DESCRIPTION

The ML6420 single-chip Dual/Triple Video Filter ICs are
intended for low cost professional and consumer video
applications. Each channel incorporates an input buffer
amplifier, a sixth order lowpass filter, a first order allpass
equalizer, and an output 1X or 2X gain amplifier capable
of driving 75W to ground.

When RANGE is low the input and output signal range is

0.5V to 1.5V. When the input signal range is 0V to 1V,
RANGE should be tied high. In this case, an offset is added
to the input so that the output swing is kept between 0.5V
to 1.5V. The output amplifier is capable of driving up to

24mA of peak current; therefore the output voltage should
not exceed 1.8V when driving 75W to ground. The
ML6420 can be driven by a DAC with swing down to 0V.

The summer output on the ML6422 is given by 2x(V
V

) – 2.5V when RANGE = 0 and 2x(V

INC

0.5V when RANGE is high. So, V
such that this output does not go below 0.5V or above

2.5V for proper operation.

INA

and V

INA

INC

+ V

should be

INC

INA

) –

+

6