Micro Linear Corporation ML6423CS-1, ML6423CS-5, ML6423CS-2 Datasheet

June 1999

PRELIMINARY

ML6423*

Dual S-Video Lowpass Filter with

Phase and Sinx/x Equalization

GENERAL DESCRIPTION

The ML6423 monolithic BiCMOS 6th-order filter provides
a two-channel fixed frequency lowpass filtering for video
applications. This dual phase equalized filter with sinx/x
correction is designed for reconstruction filtering at the
output of a Video DAC. A composite sum output
eliminates the need for a third DAC.

Cutoff frequencies are either 5.5MHz or 9.6MHz. Each
channel incorporates a 6th-order lowpass filter, a first
order allpass filter, a gain boost circuit, and a 75W coax
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 2X gain filters are powered from a single 5V supply,
and can drive 1V

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

P-P

P-P

into

150W (0.5V to 2.5V) with the internal coax drivers.

BLOCK DIAGRAM

10

BV

V

CC

7

V

CC

FEATURES

■ 5.5 or 9.6MHz bandwidth with 6dB gain

■ >40dB stopband rejection

■ No external components or clocks

■ ±10% frequency accuracy over maximum supply

and temperature variation

■ <2% differential gain, <2° differential phase

■ <20ns group delay variation

■ 5V ±10% operation

■ Composite (sum) output

■ High sink current for AC coupled loads, ML6423-5

* This Product Is End Of Life As Of August 1, 2000

4

C

CC

13

A

V

CC

16

15

1

VINA (Y)

RANGE

VINC (C)

2kΩ

2kΩ

2kΩ

2kΩ

I

BIAS

BUF

LOWPASS

FILTER A

ALLPASS

FILTER

SINX/X

EQUALIZER

∑

I

BIAS

BUF

LOWPASS

FILTER C

GND

2

GNDA

14

ALLPASS

FILTER

GNDC

ML6423-1 ML6423-2 ML6423-5
Filter A 5.50MHz 9.6MHz 9.6MHz
Filter C 5.50MHz 9.6MHz 9.6MHz

SINX/X

EQUALIZER

GNDB

3

A (Y)

V

3.43kΩ

V

3.43kΩ

3.43kΩ

OUT

OUT

V

OUT

12

B (CV)

8

C (C)

6

2X
BUF

2X
BUF

2X
BUF

9

1

ML6423

PIN CONFIGURATION

ML6423

16-Pin Wide SOIC (S16W)

VINC

GND

GNDC

V

CC

NC

V

C

OUT

VCCC

V

B

OUT

PIN DESCRIPTION

PIN NAME FUNCTION

1VINC Signal input to filter C. Input

impedance is 4kW.

2 GND Power and logic ground.

3 GNDC Ground pin for filter C.

4V

CC

5 NC No Connect

6V

C Output of filter C. Drive is 1V

OUT

7VCCC Power supply voltage for filter C.

8V

B Sum of Filter A and Filter C. Drive is

OUT

9 GNDB Ground pin for output B.

Positive supply: 4.5V to 5.5V.

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

P-P

(0.5V to 2.5V).

1V

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

P-P

into 150W (0.5V to 2.5V).

into 150W

P-P

1
2
3
4
5
6
7
8

into

TOP VIEW

P-P

VINA

16

RANGE

15

GNDA

14

VCCA

13

V

A

12
11
10

OUT

NC

VCCB

GNDB

9

PIN NAME FUNCTION

10 VCCB Power supply voltage for output B.

11 NC No Connect

12 V

A Output of filter A. Drive is 1V

OUT

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

P-P

into 150W

P-P

into

(0.5V to 2.5V).

13 VCCA Power supply voltage for filter A.

14 GNDA Ground pin for filter A.

15 RANGE Input signal range select. 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, while the output range is 0.5V
to 2.5V.

16 VINA Signal input to filter A. Input

impedance is 4kW.

2

ABSOLUTE MAXIMUM RATINGS

ML6423

Absolute maximum ratings are those values beyond
which the device could be permanently damaged.
Absolute maximum ratings are stress ratings only and

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

Lead Temperature (Soldering 10 sec) ..................... 150°C

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

functional device operation is not implied.

OPERATING CONDITIONS

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

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

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

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

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

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

ELECTRICAL CHARACTERISTICS

Unless otherwise specified VCC = 5V ± 10%, RL =75W or 150W, V
Load, TA = Operating Temperature Range (Notes 1, 2, 3)

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

GENERAL

R

DR/R

I

BIAS

Input Impedance 3k 4 5 kW

IN

Input R Matching ±2 %

IN

Input Current VIN = 0.5V, RANGE = low 45 µA

VIN = 0.0V, RANGE = high –210 µA

Differential Gain VIN = 0.8V to 1.5V

at 3.58 & 4.43 MHz 1 %

OUT

= 2V

for 150W Load and V

P-P

OUT

= 1V

for 75W

P-P

Differential Phase VIN = 0.8V to 1.5V

V

C

5.50MHZ FILTER

Input Range RANGE = Low 0.5 1.5 V

IN

Peak Overshoot 2T, 0.7V

Crosstalk Rejection fIN = 3.58, fIN = 4.43MHz 45 dB

Channel to Channel f
Group Delay Matching
(fC = 5.5MHz)

Channel to Channel f
Gain Matching

Output Current RL = 0 (short circuit) 75 mA

Load Capacitance 35 pF

L

Composite Chroma/Luma delay fC = 5.5MHz ±15 ns

Bandwidth (monotonic passband) –0.55dB (Note 4) 4.95 5.50 6.05 MHz

Subcarrier Frequency Gain fIN = 3.58MHz 0.9 1.4 2.3 dB

ML6423-1 fIN = 4.43MHz 1.1 1.6 2.5 dB

at 3.58 & 4.43 MHz 1 deg

RANGE = High 0.0 1.0 V

pulse 2.0 %

P-P

= 100kHz ±3 ns

IN

= 100kHz ±1.5 %

IN

fC = 9.6MHz ±8 ns

Attenuation fIN = 10MHz 20 25 dB

fIN = 50MHz 45 55 dB

Output Noise BW = 30MHz 1 mV

Group Delay 180 ns

RMS

3