19-3780; Rev 1; 3/09
KIT
ATION
EVALU
E
BL
AVAILA
Complete Audio/Video
Backend Solution
General Description
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
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 standard-
definition 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 single-
ended sources with external biasing. The audio chan-
nels 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.
Ordering Information
PART
MAX4079CUG+
TEMP RANGE
0°C to +70°C
PIN-PACKAGE
24 TSSOP
+Denotes
lead(Pb)-free package.
Functional Diagram
AUDV
VVID
REXT
Applications
Satellite Receivers
Cable Receivers
Home Theater Systems
DVD Players
AV Receivers
Televisions
YIN
CLAMP
LP
FILTER
+6dB
YOUT
CIN
BIAS
NETWORK
LP
FILTER
+6dB
COUT
+6dB
CVBSIN
CLAMP
LP
FILTER
+6dB
CVBSOUT1
CVBSOUT2
+6dB
RINP
+6dB
RINN
+3dB
LINP
ROUT1
ROUT2
MONO
Pin Configuration appears at end of data sheet.
LINN
MAX4079
+6dB
LOUT1
+6dB
LOUT2
GAUD
GVID
CBYPASS
________________________________________________________________
Maxim Integrated Products
1
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.
Complete Audio/Video
Backend Solution
MAX4079
ABSOLUTE MAXIMUM RATINGS
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
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.
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, T
A
= 0°C to
+70°C, unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 1)
PARAMETER
SUPPLIES
Audio Supply Voltage Range
Video Supply Voltage Range
Video Quiescent Supply Current
Audio Quiescent Supply Current
Thermal Shutdown
Thermal-Shutdown Hysteresis
VIDEO
Voltage Gain
Gain Matching
Input Voltage Swing
Clamp Voltage
Chroma Bias
Droop
REXT Reference Voltage
Input Resistance
Input Clamping Current
Output Voltage Swing
Short-Circuit Current
Power-Supply Rejection Ratio
A
V,VID
ΔA
V,VID
V
IN,VID
V
CLMP
V
BIAS
D
V
REXT
R
IN,VID
I
CLMP
V
OUT,VID
I
SC,VID
PSRR
VID
CVBSIN or YIN
CIN
CVBSIN or YIN input, V
IN
= 3.5V
CVBSOUT_, YOUT
COUT
Video output shorted to VVID or GVID
4.75V
≤
V
VVID
≤
5.25V
YOUT/COUT
CVBSOUT_
1
2.4
1.8
50
48
48
V
IN
= 1V
P-P
, all video inputs, no load
V
IN
= 1V
P-P
, all video inputs, no load
YIN, CVBSIN
CIN
CVBSOUT_ and YOUT, no signal, no load
COUT, no signal, no load
(Note 2)
0.85
1.00
2.3
10
2.5
4
5.8
-0.4
0
0
1.0
2.1
2
1.15
6
6.2
+0.4
1.2
0.9
dB
dB
V
P-P
V
V
%
V
MΩ
kΩ
µA
V
P-P
mA
dB
AUDV
VVID
I
CCV
I
CCA
T
SD
T
SD,HYS
V
VVID
= 5.25V, no load, all video inputs
AC-coupled to ground
V
AUDV
= 12.6V, no load, audio inputs
biased at 2.5V
Rising die temperature
8.5
4.75
5.0
60
8
+150
25
12.6
5.25
100
15
V
V
mA
mA
°C
°C
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
2
_______________________________________________________________________________________
Complete Audio/Video
Backend Solution
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, T
A
= 0°C to
+70°C, unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 1)
PARAMETER
AUDIO
Voltage Gain
Mono Voltage Gain
Gain Matching Between
Channels
Input Voltage Range
Differential Input Voltage Range
Input Current
Output Voltage Swing
Short-Circuit Current
Power-Supply Rejection Ratio
Common-Mode Rejection Ratio
A
V,AUD
A
V,MONO
ΔA
V,AUD
V
IN,AUD
I
IN,AUD
V
OUT,AUD
I
SC,AUD
PSRR
AUD
CMRR
AUD
8.5V
≤
V
AUDV
≤
12.6V
0.3V
≤
V
CM
≤
5.2V
70
50
60
Input overdriven, 10kΩ load to 4.15V
7.4
15
1.414V
P-P
differential input
1.414V
P-P
differential input, L
IN
= R
IN
1.414V
P-P
differential input
Inferred from CMRR test
5.8
2.8
-0.4
0.3
-1.85
6
3
6.2
3.2
+0.4
5.2
+1.85
2
dB
dB
dB
V
V
µA
V
P-P
mA
dB
dB
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
MAX4079
V
IN,AUD DIF
Inferred from output voltage swing
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, T
A
= 0°C to +70°C, unless otherwise
noted. Typical values are at T
A
= +25°C.) (Note 1)
PARAMETER
VIDEO
CVBSOUT1 = CVBSOUT2 =
YOUT = COUT = 2V
P-P
;
R
L
= 150Ω to ground,
attenuation is referred to
100kHz
V
OUT
= 2V
P-P
CVBSOUT_, YOUT, COUT, 5-step
modulated staircase
CVBSOUT_, YOUT, COUT, 5-step
modulated staircase
f = 100kHz, 0.5V
P-P
YOUT/COUT
CVBSOUT_
f = 4MHz
f = 7MHz
f = 27MHz
40
-0.5
3
50
30
0.5
0.9
48
44
65
25
0.5
35
-63
dB
Audio/Video Crosstalk
X
TALK,VD/AD
f = 15kHz, 1V
P-P
input, between any two
active audio or video inputs
-76
V/µs
%
degrees
dB
dB
ns
Ω
pF
+0.5
dB
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Filter Attenuation
A
VIDEO
Slew Rate
Differential Gain
Differential Phase
Power-Supply Rejection Ratio
Peak Signal to RMS Noise
Group Delay Deviation
Output Impedance
Capacitive Load
Video Crosstalk
SR
DG
DP
PSRR
VID
SNR
VID
GD
Z
OUT,VID
C
L,VID
X
TALK,VID
CVBSOUT_, YOUT, COUT, V
IN
= 1V
P-P
CVBSOUT_, YOUT, COUT, f
IN
= 0.1MHz to
4.5MHz
f = 3.58MHz
No sustained oscillations
f = 3.58MHz, 1V
P-P
input, between any two
active inputs
_______________________________________________________________________________________
3
Complete Audio/Video
Backend Solution
MAX4079
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, T
A
= 0°C to +70°C, unless otherwise
noted. Typical values are at T
A
= +25°C.) (Note 1)
PARAMETER
AUDIO
LOUT_, ROUT_, f
IN
= 20Hz to 20kHz,
0.5V
RMS
input
MONO, f
IN
= 20Hz to 20kHz, 0.5V
RMS
input
f
IN
= 1.0kHz, 0.5V
RMS
, CCIR weighing
highpass filter at 20Hz, lowpass filter at
20kHz
f
IN
= 1.0kHz, 0.5V
RMS
f
IN
= 1.0kHz, 1V
RMS
f = 1kHz
f = 1kHz, 0.5V
RMS
input
No sustained oscillations
0.01
dB
0.01
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Gain Flatness
ΔA
AUD
Signal-to-Noise Ratio
Total Harmonic Distortion
Plus Noise
Output Impedance
Power-Supply Rejection Ratio
Crosstalk
Capacitive Load
SNR
AUD
85
0.005
0.003
0.2
60
70
200
dB
THD+N
Z
O,AUD
X
TLK,AUD
C
L,AUD
%
Ω
dB
dB
pF
PSRR
AUD,AC
f = 1kHz, V
RIPPLE
= 200mV
P-P
Note 1:
All devices are 100% production tested at T
A
= +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.
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, T
A
= +25°C, unless otherwise noted.)
CHROMA LARGE-SIGNAL BANDWIDTH
MAX4079 toc01
LUMA LARGE-SIGNAL BANDWIDTH
MAX4079 toc02
CVBSOUT_ LARGE-SIGNAL BANDWIDTH
V
IN
= 1V
P-P
0
-10
RESPONSE (dB)
-20
-30
-40
-50
-60
-70
-80
MAX4079 toc03
10
0
-10
RESPONSE (dB)
-20
-30
-40
-50
-60
-70
-80
0.1
1
10
V
IN
= 1V
P-P
10
0
-10
RESPONSE (dB)
-20
-30
-40
-50
-60
-70
-80
V
IN
= 1V
P-P
10
100
0.1
1
10
100
0.1
1
10
100
FREQUENCY (MHz)
FREQUENCY (MHz)
FREQUENCY (MHz)
4
_______________________________________________________________________________________
Complete Audio/Video
Backend Solution
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, T
A
= +25°C, unless otherwise noted.)
VIDEO CROSSTALK (CVBSOUT_ TO YIN)
MAX4079 toc04
MAX4079
VIDEO CROSSTALK (CVBSOUT_ TO CIN)
MAX4079 toc05
VIDEO CROSSTALK (COUT TO CVBSIN)
V
IN
= 1V
P-P
-50
-60
RESPONSE (dB)
-70
-80
-90
-100
-110
-120
MAX4079 toc06
-40
V
IN
= 1V
P-P
-50
-60
RESPONSE (dB)
-70
-80
-90
-100
-110
-120
0.1
1
10
-40
V
IN
= 1V
P-P
-50
-60
RESPONSE (dB)
-70
-80
-90
-100
-110
-120
-40
100
0.1
1
10
100
0.1
1
10
100
FREQUENCY (MHz)
FREQUENCY (MHz)
FREQUENCY (MHz)
VIDEO CROSSTALK (COUT TO YIN)
MAX4079 toc07
VIDEO CROSSTALK (YOUT TO CVBSIN)
MAX4079 toc08
VIDEO CROSSTALK (YOUT TO CIN)
V
IN
= 1V
P-P
-50
-60
RESPONSE (dB)
-70
-80
-90
-100
-110
-120
MAX4079 toc09
-40
V
IN
= 1V
P-P
-50
-60
RESPONSE (dB)
-70
-80
-90
-100
-110
-120
0.1
1
10
-40
V
IN
= 1V
P-P
-50
-60
RESPONSE (dB)
-70
-80
-90
-100
-110
-120
-40
100
0.1
1
10
100
0.1
1
10
100
FREQUENCY (MHz)
FREQUENCY (MHz)
FREQUENCY (MHz)
CVBSOUT_ GROUP DELAY
MAX4079 toc10
CHROMA GROUP DELAY
MAX4079 toc11
YOUT GROUP DELAY
90
80
70
DELAY (ns)
60
50
40
30
20
10
0
MAX4079 toc12
100
90
80
70
DELAY (ns)
60
50
40
30
20
10
0
0.1
1
FREQUENCY (MHz)
100
90
80
70
DELAY (ns)
60
50
40
30
20
10
0
100
10
0.1
1
FREQUENCY (MHz)
10
0.1
1
FREQUENCY (MHz)
10
_______________________________________________________________________________________
5
国产芯片交流
京公网安备 11010802033920号
Copyright © 2005-2026 EEWORLD.com.cn, Inc. All rights reserved
电子工程世界
