MAX4079CUG+ Maxim Integrated Products, MAX4079CUG+ Datasheet - Page 8

• Manufacturer Part Number: MAX4079CUG+
• Description: IC A/V BACKEND 24-TSSOP
• Manufacturer: Maxim Integrated Products

Specifications of MAX4079CUG+

• Applications: *
• Mounting Type: Surface Mount
• Package / Case: 24-TSSOP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

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
output with a differential input of ±1.85V. The audio
Complete Audio/Video
Backend Solution
8
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2, 24
4, 21
PIN
10
11
12
13
14
15
16
17
18
19
20
22
23
1
3
5
6
7
8
9
CVBSOUT1
CVBSOUT2
CBYPASS
CVBSIN
ROUT2
ROUT1
LOUT2
LOUT1
MONO
NAME
GAUD
AUDV
COUT
YOUT
REXT
GVID
LINN
RINN
RINP
VVID
LINP
CIN
YIN
Detailed Description
External Filter Resistor. Bypass with a 10kΩ ±1% resistor and a 0.1µF capacitor to GVID.
Video Power-Supply Input
Composite Video Input
Video Ground
Luma Input
Audio LDO Regulator Bypass Capacitor. Bypass with a1µF capacitor to GAUD.
Chroma Input
Audio Power-Supply Input
Left-Channel Audio Positive Input
Left-Channel Audio Negative Input
Right-Channel Audio Negative Input
Right-Channel Audio Positive Input
Right-Channel Audio Output 2
Right-Channel Audio Output 1
Audio Ground
Mono Audio Output
Left-Channel Audio Output 2
Left-Channel Audio Output 1
Chroma Video Output
Luma Video Output
Composite Video Output 1
Composite Video Output 2
RMS
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 video section of the MAX4079 implements DC
restore/biasing, amplification, and reconstruction filter-
ing for the Y-C and CVBS input signals. All of the video
inputs are AC-coupled. DC restore is performed using
a sync tip clamp for both luma and composite video
channels. The chroma DC level input is biased at the
midlevel of the signal.
All video channels have a fixed gain of +6dB. The DC
level at the video outputs is controlled so that coupling
capacitors are not required.
All composite and luma video outputs are capable of
driving 2.4V
driving 1.8V
to 35pF of load capacitance can be tolerated at each
video output without stability or slew-rate issues.
FUNCTION
P-P
P-P
, and the chroma output is capable of
into 150Ω resistive load to ground. Up
Pin Description
Video