Datasheet ML6415 Datasheet (Fairchild Semiconductor)

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ML6415

S-Video Filter with Summed Composite Output,
Sound Trap, and Group Delay Compensation

Features

• 7.1MHz Y and C filters, with CV out

• 14dB notch at 4.5MHz for sound trap

• 42dB stopband attenuation at 27MHz on Y, C, and CV

• Better than 1dB flatness to 4.5 MHz on Y, C, and CV

• RF Modulator output differential group delay between
400kHz and 3.58MHz is typically -170ns.

• No external frequency select components or clocks

• 9ns group delay flatness on Y, C, and CV output

•AC coupled inputs and outputs

• 0.4% differential gain on Y, C and CV channels, 0.4º
differential phase on Y, C and CV channels

• 0.8% total harmonic distortion on all channels

• DC restore with low tilt

Applications

• Cable Set-top Boxes

• Satellite Set-top Boxes

•DVD Players

Block Diagram

General Description

The ML6415 is a dual Y/C 4th-order Butterworth lowpass
video filter optimized for minimum overshoot and flat group
delay. The device also contains a summing circuit to gener­ate filtered composite video, an audio trap and group delay
compensation circuit to notch-out audio, providing an area
for the addition of the FM audio carrier(s) and mimic the
group delay distortion introduced at the transmitter. The
group delay predistortion compensates for the nominal TV
receiver IF filter distortion.

In a typical application, the Y and C input signals from
DACs are AC coupled into the filter. Both channels have DC
restore circuitry to clamp the DC input levels during video
sync. The Y and C channels use a separate feedback clamp.
The clamp pulse is derived from the Y channel.

The outputs are AC coupled. The Y, C, CV, and modulator
outputs can drive 2V
load). The Y, C, CV, and notch channels have a gain of
approximately 2 (6dB) with 1V

into a 150 Ω load (1V

pp

input levels.

pp

75 Ω coax

pp

YIN

CIN

VCC

7

SYNC STRIP,
REFERENCE,

AND TIMING

1

4

4TH – ORDER

FILTER

gM

1V

gM

4TH – ORDER

FILTER

1V

+

Σ

+

×2

×2

3

GND

×2

NOTCH,
GROUP

DELAY

8

6

2

5

YOUT

CVOUT

RF MOD

COUT

REV. 2F May 2003

ML6415 DATA SHEET

Pin Configuration

ML6415

8-Pin SOIC (S08)

YIN

RF MOD

GND

CIN

1

2

3

4

TOP VIEW

8

YOUT

7

VCC

6

CVOUT

5

COUT

Pin Descriptions

Pin # Signal Name Description

1 YIN Luminance input

2 RF MOD Output to RF modulator driver

3 GND Ground

4 CIN Chrominance input

5 COUT Chrominance output

6CVOUT Composite video output

7 VCC 5V supply

8YOUT Luminance output

Functional Description

Introduction

This product is a dual monolithic continuous time video filter
designed for reconstructing the luminance and chrominance
signals from an S-Video D/A source. Composite video out­put is generated by summing the Y and C outputs. The chip
is intended for use in applications with AC coupled input and
AC coupled outputs. (See Figure 1)

The reconstruction filters approximate a 4th-order Butter­worth characteristic with an optimization toward low over­shoot and flat group delay. Y, C, and CV outputs are capable
of driving 2V
to 35pF of load capacitance at the output pin.

All channels are clamped during sync to establish the appro­priate output voltage swing range. Thus the input coupling
capacitors do not behave according to the conventional RC
time constant. Clamping for all channels settles to less than
10mv within 5ms of a change in video input sources.

In most applications the input coupling capacitors are 0.1µF.
The Y and C input typically sinks 1µA during active video,

into AC coupled 150 Ω video loads, with up

pp

which nominally tilts a horizontal line by about 2mV at the Y
output. During sync, the clamp typically sources 20µA to
restore the DC level. The net result is that the average input
current is zero.

Any change in the input coupling capacitor’s value will
inversely alter the amount of tilt per line. Such a change will
also linearly affect the clamp response times.

This product is robust and stable under all stated load and
input conditions. Capacitive bypassing VCC directly to
ground ensures this performance.

Luminance (Y) I/O

The luma input is driven by either a low impedance source of
1V

or the output of a 75 Ω terminated line. The input is

P-P

required to be AC coupled via a 0.1µF coupling capacitor
which allows for a settling time of 5ms. The luma output is
capable of driving an AC coupled 150 Ω load at 2V
1V

into a 75 Ω load. Up to 35pF of load capacitance

pp

(at the output pin) can be driven without stability or slew
issues. The output is AC coupled with a 400µF or larger AC
coupling capacitor.

pp

, or

2

REV. 2F May 2003

DATA SHEET ML6415

Chrominance (C) I/O

The chroma input is driven by a low impedance source of

0.7V

or the output of a 75 Ω terminated line. The input is

pp

required to be AC coupled via a 0.1µF coupling capacitor
which allows for a clamp setting time of 5ms. The chroma
output is capable of driving an AC coupled 150 Ω load at
2V

P-P

, or 1V

into a 75 Ω load. Up to 35pF of load capaci-

P-P

tance can be driven without stability or slew issues. A 0.1µF
AC coupling capacitor is recommended at the output.
(This reduces the circuit cost as chroma does not contain
low frequency components.)

Typical Applications Diagram

4.5MHz FM SOUND

+

NOTCH

YIN

ENCODER

CIN

5.0V

0.1µF

0.1µF

1

4

4th-ORDER

FILTER

+

Σ

+

4th-ORDER

FILTER

AND GROUP

DELAY

PROTECTION

37

2

Σ

220µF

8

6

5

220µF

220

220µF

Composite Video (CV) Output

The composite video output is capable of driving 2 loads to
2V

. It is intended to drive a TV and a VCR. Either the TV

P-P

input or the VCR input can be shorted to ground and the
other output will still meet specifications. Up to 35pF of load
capacitance (at the output pin) can be driven without stability
or slew issues.

RF Modulator Output

The RF modulator output is capable of driving a 600 Ω load
to 2V

VIDEO MODULATOR

75Ω

75Ω

µF

75Ω

75Ω

, but is primarily intended to drive a modulator load.

P-P

TO CHANNEL 3 OR 4

VIDEO CABLES

75Ω

75Ω

75Ω

75Ω

YOUT

CVOUT TO TV

CVOUT TO VCR

COUT

Figure 1. Coupled S-Video, Composite Video Line Driver, Sound Trap, and Group Delay Pre-distortion

REV. 2F May 2003

1µF0.1µF

3

ML6415 DATA SHEET

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.

Parameter Min. Max. Units

DC Supply Voltage –0.3 7 V

Analog & Digital I/O GND – 0.3 V

+ 0.3 V

CC

Output Current (Continuous)
CV Channel
C and Y Channels

60
30

mA
mA

Junction Temperature 150 °C

Storage Temperature Range –65 150 °C

Lead Temperature (Soldering, 10s) 260 °C

Thermal Resistance ( θ

) 115 °C/W

JA

Operating Conditions

Parameter Min. Max. Units

Temperature Range 0 70 °C

V

Range 4.5 5.5 V

CC

Electrical Characteristics

Unless otherwise specified, V

Symbol Parameter Conditions Min. Typ. Max. Units

I

CC

V

AV

AV

AV

CC

YC

RFMOD

CV

Supply Current 60 85 mA

Supply Range 4.5 5.0 5.5 V

Low Frequency Gain (Y

Low Frequency Gain (RFMOD) at 400KHz 6.1 6.7 7.3 dB

Low Frequency Gain (CV

C

Output Level (During Sync) Sync Present on Y

OUT

Y

Output Level (During Sync) Sync Present on Y

OUT

CV

Output Level (During Sync) Sync Present on Y

OUT

RFMOD Output Level (During Sync) Sync Present on Y

tCLAMP Clamp Response Time (Y Channel) Settled to Within 10mV, 0.1µF cap

f

1dB

f

C

f

SB

V

i

–1.0dB Bandwidth (Flatness)
(Y

, C

OUT

–3dB Bandwidth (Flatness)
(Y

, C

OUT

Stopband Rejection (Y
and CV

OUT

Input Signal Dynamic Range
(All Channels)

I

SC

Output Short Circuit Current
(All Channels)

= 5.0V ±10%, All inputs AC coupled with 100nF, T

CC

OUT

OUT

, and CV

, and CV

OUT

OUT

OUT

OUT

, C

OUT

)

)

, C

) at 400KHz 5.75 6.0 6.25 dB

OUT

) at 400KHz 5.55 5.9 6.25 dB

OUT

on Y

,

f

and C

IN

= 27MHz to 100MHz worst case -37 –42 dB

IN

)

AC Coupled 1.2 1.4 V

C

, Y

OUT

OUT

GND (Note 1)

IN

, CV

= Operating Temperature Range

A

IN

IN

IN

IN

, or RFMOD to

OUT

1.6 2.0 2.4 V

0.75 1.0 1.25 V

0.75 1.0 1.25 V

0.65 1.0 1.35 V

5ms

4.0 4.5 MHz

7.1 MHz

40 80 mA

pp

4

REV. 2F May 2003

DATA SHEET ML6415

Electrical Characteristics

Unless otherwise specified, V

= 5.0V ±10%, All inputs AC coupled with 100nF, TA = Operating Temperature Range

CC

(continued)

Symbol Parameter Conditions Min. Typ. Max. Units

CL Output Shunt Capacitance

All Outputs 35 pF

(All Channels)

dG Differential Gain Y

dP Differential Phase Y

THD Output Distortion (All Channels) VOUT = 1.8V

OUT

OUT

, C

, C

OUT

OUT

, and CV

, and CV

, Y/C Out at

pp

OUT

OUT

0.4 %

0.4 °

0.8 %

3.58MHz

XTALK Crosstalk From C

3.58MHz to Y

From Y
C

OUT

PSRR PSRR (All Channels) 0.5V

of 0.5V

IN

of 0.4V

IN

(100kHz) at VCC –40 dB

pp

at

pp

OUT

at 3.58MHz, to

pp

–55 dB

–58 dB

SNR Y, C Channel NTC-7 weighting 4.2MHz lowpass -75 dB

CV Channel NTC-7 weighting 4.2MHz lowpass -69 dB

RFMOD Channel NTC-7 weighting 4.2MHz lowpass -60 dB

tpd Group Delay (Y, C, CV) 70 ns

∆ tpd Group Delay Deviation from

to 3.58MHz (NTSC) 9 ns

Flatness (Y, C, and CV)

tSKEW Skew Between Y

OUT

and C

OUT

at 1MHz 0 ns

Tpd Group Delay RFMOD f = 3.58MHz (referenced to 400kHz) -230 -170 -130 ns

Tpass Pass Delay, RFMOD Output f = 200kHz to 3MHz -50 50 ns

dG

dP

RFMOD

RFMOD

Differential Gain RFMOD Channel 1.5 %

Differential Phase RFMOD Channel 1.0 °

pK Gain Peaking (Note 2) RFMOD Channel at 2.0MHz -0.5 0.5 0.75 dB

MCF

Modulator Channel Flatness (Note 2)

at 3.75MHz -0.5 +0.75 dB

AV Notch Attenuation (Note 2) From 4.425MHz to 4.63MHz 14 dB

AV Notch Attenuation (Note 2) at 4.2MHz 8 dB

PSRRmt Supply Sensitivity Modulator

VCC = 4.5V to 5.5V at 3.58MHz 0.12 dB/V

Channel Flatness

TCm Modulator Channel Flatness

VCC = 5V at 3.58MHz -0.04 dB/°C

Temperature Sensitivity

Notes

1. Sustained short circuit protection limited to 10 seconds

2. Referenced to 400kHz

3. Group delay is tested down to 400kHz but guaranteed by design to 200kHz.

REV. 2F May 2003

5

ML6415 DATA SHEET

Mechanical Dimensions inches/(millimeters)

Package: S08

8-Pin SOIC

0.189 - 0.199
(4.80 - 5.06)

8

0.017 - 0.027
(0.43 - 0.69)
(4 PLACES)

0.055 - 0.061

(1.40 - 1.55)

PIN 1 ID

1

0.050 BSC
(1.27 BSC)

0.012 - 0.020
(0.30 - 0.51)

SEATING PLANE

0.148 - 0.158
(3.76 - 4.01)

0.059 - 0.069
(1.49 - 1.75)

0.228 - 0.244
(5.79 - 6.20)

0.004 - 0.010
(0.10 - 0.26)

0° - 8°

0.015 - 0.035
(0.38 - 0.89)

0.006 - 0.010
(0.15 - 0.26)

6 REV. 2F May 2003

ML6415 DATA SHEET

Ordering Information

Part Number Temperature Range Package

ML6415CS 0° to 70° 8 Pin SOIC (S08)

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ANY PRODUCTS HEREIN TO IMPROVE RELIABILITY, FUNCTION OR DESIGN. FAIRCHILD DOES NOT ASSUME
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NEITHER DOES IT CONVEY ANY LICENSE UNDER ITS PATENT RIGHTS, NOR THE RIGHTS OF OTHERS.

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