MAXIM MAX4079 Technical data

General Description

The MAX4079 filters and buffers video (NTSC/PAL/DVB)
and stereo audio signals from the MPEG decoder of a
cable/satellite receiver, VCR/DVD player, or a TV to an
external load. The MAX4079 has luma-chroma (Y-C)
and composite (CVBS) video inputs with one Y-C and
two CVBS outputs. All video inputs are AC-coupled with
internal DC biasing on the chroma input and active
clamps for the luma and composite.

The MAX4079 video reconstruction filters have a 6MHz
cutoff frequency and 50dB attenuation at 27MHz. The
filters are matched with flat group delay for standard­definition video. The video gain is fixed at +6dB to drive
a 75Ω back-terminated load (150Ω) to unity gain. The
video outputs can be either DC- or AC-coupled and are
powered by a single +5V supply.

The MAX4079 audio amplifiers have differential inputs
for optimum performance, but can be used with single­ended sources with external biasing. The audio chan­nels have a fixed gain of +6dB and deliver 2.6V

RMS

output with a differential input of ±1.85V. The audio
amplifiers operate from a +9V to +12V single supply
and feature an internal bias generator. An on-chip
mixer also provides a mono output, with +3dB gain,
derived from the left and right audio channels.

The MAX4079 is available in 24-pin TSSOP package,
and is fully specified over the 0°C to +70°C commercial
temperature range. The MAX4079 Evaluation Kit is
available to help speed designs.

Applications

Satellite Receivers

Cable Receivers

Home Theater Systems

DVD Players

AV Receivers

Televisions

Features

♦ Integrated Video Reconstruction Filters—6MHz

Lowpass Filter Supports NTSC, PAL, or DVB per
ITU-601

♦ Integrated Video and Audio Amplifiers

♦ Integrated Video Input Clamps and Biasing

♦ Mono Audio and CVBS Output to Drive External

Modulator

♦ +5V (Video) and +9V to +12V (Audio) Single-

Supply Operation

♦ Differential/Single-Ended Audio Inputs

♦ 24-Pin TSSOP Package

MAX4079

Complete Audio/Video

Backend Solution

________________________________________________________________

Maxim Integrated Products

1

Ordering Information

19-3780; Rev 1; 3/09

EVALUATION KIT

AVAILABLE

+

Denotes lead(Pb)-free package.

Functional Diagram

LP

FILTER

CLAMP

BIAS

NETWORK

CLAMP

RINP

RINN

LINP

LINN

CIN

CVBSIN

YIN

COUT

CVBSOUT1

CVBSOUT2

ROUT1

ROUT2

MONO

LOUT1

LOUT2

GVID

GAUD

VVID

AUDV

REXT

CBYPASS

+3dB

+6dB

+6dB

+6dB

+6dB

+6dB

+6dB

+6dB

+6dB

YOUT

LP

FILTER

LP

FILTER

MAX4079

Pin Configuration appears at end of data sheet.

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.

PART TEMP RANGE PIN-PACKAGE

MAX4079CUG+ 0°C to +70°C 24 TSSOP

MAX4079

Complete Audio/Video
Backend Solution

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.

GVID to GAUD.......................................................-0.1V to +0.1V

VVID to GVID ............................................................-0.3V to +6V

AUDV to GAUD ......................................................-0.3V to +14V

LINP, LINN, RINP, RINN, CBYPASS to GAUD .........-0.3V to +6V

LOUT1, LOUT2, ROUT1, ROUT2,

MONO to GAUD ......-0.3V to lower of (+9V and AUDV + 0.3V)

YIN, CIN, CVBSIN, REXT to GVID.............-0.3V to (VVID + 0.3V)

YOUT, COUT, CVBSOUT1, CVBSOUT2 to

GVID.......................................................-0.3V to (VVID + 0.3V)

Video Output Short-Circuit Duration to GVID or

VVID ........................................................................Continuous

Audio Output Short-Circuit Duration to GAUD or

AUDV.......................................................................Continuous

Continuous Power Dissipation (T

A

= +70°C)

24-Pin TSSOP (derate 12.2mW/°C above +70°C) .....975.6mW

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

Storage Temperature Range .............................-65°C to +150°C

Junction Temperature......................................................+150°C

Lead Temperature (soldering, 10s) .................................+300°C

DC ELECTRICAL CHARACTERISTICS

(V

VVID

= +5V, V

AUDV

= +12V, V

GVID

= V

GAUD

= 0V, R

LOAD_VID

= 150Ω to GVID, R

REXT

= 10kΩ ±1%, C

CBYPASS

= 1µF, TA= 0°C to

+70°C, unless otherwise noted. Typical values are at T

A

= +25°C.) (Note 1)

SUPPLIES

Audio Supply Voltage Range AUDV 8.5 12.6 V

Video Supply Voltage Range VVID 4.75 5.0 5.25 V

Video Quiescent Supply Current I

Audio Quiescent Supply Current I

Thermal Shutdown T

Thermal-Shutdown Hysteresis T

VIDEO

Voltage Gain A

Gain Matching ΔA

Input Voltage Swing V

Clamp Voltage V

Chroma Bias V

Droop D (Note 2) 2 %

REXT Reference Voltage V

Input Resistance R

Input Clamping Current I

Output Voltage Swing V

Short-Circuit Current I

Power-Supply Rejection Ratio PSRR

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

CCV

CCA

SD,HYS

V,VID

V,VIDVIN

IN,VID

CLMP

BIAS

REXT

IN,VID

CLMP

OUT,VID

SC,VID

SD

V

= 5.25V, no load, all video inputs

VVID

AC-coupled to ground

V

= 12.6V, no load, audio inputs

AUDV

biased at 2.5V

Rising die temperature +150 °C

VIN = 1V

YIN, CVBSIN 0 1.2

CIN 0 0.9

CVBSOUT_ and YOUT, no signal, no load 1.0 V

COUT, no signal, no load 2.1 V

CVBSIN or YIN 2.3 MΩ

CIN 10 kΩ

CVBSIN or YIN input, VIN = 3.5V 1 2.5 4 µA

CVBSOUT_, YOUT 2.4

COUT 1.8

Video output shorted to VVID or GVID 50 mA

4.75V ≤ V

VID

5.25V

= 1V

P-P

P-P

VVID

, all video inputs, no load 5.8 6 6.2 dB

, all video inputs, no load -0.4 +0.4 dB

YOUT/COUT 48

≤

CVBSOUT_ 48

0.85 1.00 1.15 V

60 100 mA

815mA

25 °C

V

P-P

V

P-P

dB

MAX4079

Complete Audio/Video

Backend Solution

_______________________________________________________________________________________ 3

DC ELECTRICAL CHARACTERISTICS (continued)

(V

VVID

= +5V, V

AUDV

= +12V, V

GVID

= V

GAUD

= 0V, R

LOAD_VID

= 150Ω to GVID, R

REXT

= 10kΩ ±1%, C

CBYPASS

= 1µF, TA= 0°C to

+70°C, unless otherwise noted. Typical values are at T

A

= +25°C.) (Note 1)

AC ELECTRICAL CHARACTERISTICS

(V

VVID

= +5V, V

AUDV

= +12V, V

GVID

= V

GAUD

= 0V, R

IN_VIDEO

= 75Ω to GVID, C

IN_VIDEO

= 0.1µF, R

LOAD_VID

= 150Ω to GVID,

C

OUT_AUDIO

= 10µF, R

LOAD_AUD

= 10kΩ ±1% to GAUD, R

REXT

= 10kΩ, C

CBYPASS

= 1µF, TA= 0°C to +70°C, unless otherwise

noted. Typical values are at T

A

= +25°C.) (Note 1)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

AUDIO

Voltage Gain A

Mono Voltage Gain A

Gain Matching Between
Channels

Input Voltage Range V

Differential Input Voltage Range V

Input Current I

Output Voltage Swing V

Short-Circuit Current I

V,AUD

V,MONO

ΔA

V,AUD

IN,AUD

IN,AUD DIF

IN,AUD

OUT,AUD

SC,AUD

Power-Supply Rejection Ratio PSRR

Common-Mode Rejection Ratio CMRR

1.414V

1.414V

1.414V

differential input 5.8 6 6.2 dB

P-P

differential input, LIN = R

P-P

differential input -0.4 +0.4 dB

P-P

Inferred from CMRR test 0.3 5.2 V

Inferred from output voltage swing -1.85 +1.85 V

Input overdriven, 10kΩ load to 4.15V 7.4 V

8.5V ≤ V

AUD

0.3V ≤ VCM ≤ 5.2V 50 60 dB

AUD

≤ 12.6V 70 dB

AUDV

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

VIDEO

Filter Attenuation A

Slew Rate SR V

Differential Gain DG

Differential Phase DP

Power-Supply Rejection Ratio PSRR

Peak Signal to RMS Noise SNR

Group Delay Deviation GD

Output Impedance Z

Capacitive Load C

Video Crosstalk X

Audio/Video Crosstalk X

CVBSOUT1 = CVBSOUT2 =
YOUT = COUT = 2V

VIDEO

R
attenuation is referred to
100kHz

CVBSOUT_, YOUT, COUT, 5-step
modulated staircase

CVBSOUT_, YOUT, COUT, 5-step
modulated staircase

f = 100kHz, 0.5V

VID

VID

CVBSOUT_, YOUT, COUT, VIN = 1V

CVBSOUT_, YOUT, COUT, f

4.5MHz

OUT,VID

L,VID

TALK,VID

TALK,VD/AD

f = 3.58MHz 0.5 Ω

No sustained oscillations 35 pF

f = 3.58MHz, 1V
active inputs

f = 15kHz, 1V
active audio or video inputs

= 150Ω to ground,

L

= 2V

OUT

P-P

P-P

P-P

P-P

P-P

input, between any two

input, between any two

IN

;

f = 4MHz -0.5 +0.5

2.8 3 3.2 dB

f = 7MHz 3

f = 27MHz 40 50

YOUT/COUT 48

CVBSOUT_ 44

P-P

= 0.1MHz to

IN

2µA

15 mA

30 V/µs

0.5 %

0.9 degrees

65 dB

25 ns

-63

-76

P-P

dB

dB

dB

MAX4079

Complete Audio/Video
Backend Solution

4 _______________________________________________________________________________________

AC ELECTRICAL CHARACTERISTICS (continued)

(V

VVID

= +5V, V

AUDV

= +12V, V

GVID

= V

GAUD

= 0V, R

IN_VIDEO

= 75Ω to GVID, C

IN_VIDEO

= 0.1µF, R

LOAD_VID

= 150Ω to GVID,

C

OUT_AUDIO

= 10µF, R

LOAD_AUD

= 10kΩ ±1% to GAUD, R

REXT

= 10kΩ, C

CBYPASS

= 1µF, TA= 0°C to +70°C, unless otherwise

noted. Typical values are at T

A

= +25°C.) (Note 1)

Note 1: All devices are 100% production tested at TA= +25°C. Specifications over temperature limits are guaranteed by design.
Note 2: Droop is defined as the percentage change in the DC level from the start to the end of a video line. Inferred from input

clamping current with a 0.1µF coupling capacitor.

CHROMA LARGE-SIGNAL BANDWIDTH

MAX4079 toc01

FREQUENCY (MHz)

RESPONSE (dB)

101

-70

-60

-50

-40

-30

-20

-10

0

10

-80

0.1 100

VIN = 1V

P-P

LUMA LARGE-SIGNAL BANDWIDTH

MAX4079 toc02

FREQUENCY (MHz)

RESPONSE (dB)

101

-70

-60

-50

-40

-30

-20

-10

0

10

-80

0.1 100

VIN = 1V

P-P

CVBSOUT_ LARGE-SIGNAL BANDWIDTH

MAX4079 toc03

FREQUENCY (MHz)

RESPONSE (dB)

101

-70

-60

-50

-40

-30

-20

-10

0

10

-80

0.1 100

VIN = 1V

P-P

Typical Operating Characteristics

(V

VVID

= +5V, V

AUDV

= +12V, V

GVID

= V

GAUD

= 0V, R

IN_VIDEO

= 75Ω to GVID, C

IN_VIDEO

= 0.1µF, R

LOAD_VID

= 150Ω to GVID

,

C

OUT_AUDIO

= 10µF, R

LOAD_AUD

= 10kΩ to G

AUD

, R

REXT

= 10kΩ, C

BYPASS

= 1µF, TA= +25°C, unless otherwise noted.)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

AUDIO

Gain Flatness ΔA

Signal-to-Noise Ratio SNR

Total Harmonic Distortion
Plus Noise

Output Impedance Z

Power-Supply Rejection Ratio PSRR

Crosstalk X

Capacitive Load C

LOUT_, ROUT_, fIN = 20Hz to 20kHz,

AUD

0.5V

MONO, fIN = 20Hz to 20kHz, 0.5V
input

fIN = 1.0kHz, 0.5V

AUD

highpass filter at 20Hz, lowpass filter at
20kHz

THD+N

O,AUD

AUD,AC

TLK,AUD

L,AUD

fIN = 1.0kHz, 0.5V

f

f = 1kHz 0.2 Ω

f = 1kHz, V

f = 1kHz, 0.5V

No sustained oscillations 200 pF

input

RMS

= 1.0kHz, 1V

IN

RIPPLE

0.01

, CCIR weighing

RMS

RMS

0.01

85 dB

RMS

RMS

= 200mV

input 70 dB

RMS

P-P

0.005

0.003

60 dB

dB

%

MAX4079

Complete Audio/Video

Backend Solution

_______________________________________________________________________________________

5

Typical Operating Characteristics (continued)

(V

VVID

= +5V, V

AUDV

= +12V, V

GVID

= V

GAUD

= 0V, R

IN_VIDEO

= 75Ω to GVID, C

IN_VIDEO

= 0.1µF, R

LOAD_VID

= 150Ω to GVID

,

C

OUT_AUDIO

= 10µF, R

LOAD_AUD

= 10kΩ to G

AUD

, R

REXT

= 10kΩ, C

BYPASS

= 1µF, TA= +25°C, unless otherwise noted.)

VIDEO CROSSTALK (CVBSOUT_ TO YIN)

-40
VIN = 1V

-50

-60

-70

-80

RESPONSE (dB)

-90

-100

-110

-120

0.1 100

P-P

FREQUENCY (MHz)

VIDEO CROSSTALK (COUT TO YIN)

-40
VIN = 1V

-50

-60

-70

-80

RESPONSE (dB)

-90

-100

-110

-120

0.1 100

P-P

FREQUENCY (MHz)

101

101

MAX4079 toc04

MAX4079 toc07

VIDEO CROSSTALK (CVBSOUT_ TO CIN)

-40
VIN = 1V

-50

-60

-70

-80

RESPONSE (dB)

-90

-100

-110

-120

0.1 100

VIDEO CROSSTALK (YOUT TO CVBSIN)

-40
VIN = 1V

-50

-60

-70

-80

RESPONSE (dB)

-90

-100

-110

-120

0.1 100

P-P

FREQUENCY (MHz)

P-P

FREQUENCY (MHz)

VIDEO CROSSTALK (COUT TO CVBSIN)

-40
VIN = 1V

-50

MAX4079 toc05

-60

-70

-80

RESPONSE (dB)

-90

-100

-110

-120

101

0.1 100

P-P

FREQUENCY (MHz)

VIDEO CROSSTALK (YOUT TO CIN)

-40
VIN = 1V

-50

MAX4079 toc08

-60

-70

-80

RESPONSE (dB)

-90

-100

-110

-120

101

0.1 100

P-P

FREQUENCY (MHz)

MAX4079 toc06

101

MAX4079 toc09

101

100

90

80

70

60

50

DELAY (ns)

40

30

20

10

0

0.1 10

1

FREQUENCY (MHz)

CVBSOUT_ GROUP DELAY

MAX4079 toc10

100

CHROMA GROUP DELAY

90

80

70

60

50

DELAY (ns)

40

30

20

10

0

0.1 10

1

FREQUENCY (MHz)

MAX4079 toc11

100

YOUT GROUP DELAY

90

80

70

60

50

DELAY (ns)

40

30

20

10

0

0.1 10

1

FREQUENCY (MHz)

MAX4079 toc12