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PDF MAX7482 Data sheet ( Hoja de datos )
| Número de pieza | MAX7482 | |
| Descripción | (MAX7481 / MAX7482) bidirectional video filters/buffers | |
| Fabricantes | Maxim Integrated Products | |
| Logotipo |  |
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19-0671; Rev 0; 11/06
Bidirectional Video Filters/Buffers for Composite
and S-Video Portable Media Devices
General Description
The MAX7481/MAX7482 bidirectional video filters/
buffers provide the reconstruction filter and line drive
buffer for both composite (CVBS) and S-Video (Y/C)
video signals in playback mode, and anti-aliasing in
record mode for portable media devices. Each channel
consists of a lowpass filter and an output buffer capa-
ble of driving a full 2VP-P video signal into one standard
150Ω load (DC-coupled to ground). In record mode,
the MAX7481/MAX7482 output buffers have a gain of
+6dB. In playback mode, the MAX7481 output buffers
have a gain of +6dB and the MAX7482 output buffers
have a gain of +7dB.
The MAX7481/MAX7482 feature DirectDrive™ by utilizing
an internal negative charge pump and regulator to main-
tain the output blanking level at ground, eliminating the
need for a negative supply voltage, a large output cou-
pling capacitor, or a sag correction configuration.
The MAX7481/MAX7482 operate from a single +2.7V to
+3.6V power supply. These devices are available in a
space-saving 28-pin TQFN package and operate over
the -40°C to +85°C extended temperature range.
Applications
Portable Media Devices
Digital Camcorders
Digital Cameras
VIDEO
ADC
VIDEO
DAC
0V
OUT4
IN1
LPF
VIDEO
PROCESSOR
P/R
CVBSON
YCON
CONTROL
LOGIC
Features
♦ Composite and S-Video, Video-Playback and Video-
Record Interface for Portable Video Devices
♦ Saves Space by Sharing Connectors in Portable
Devices
♦ DirectDrive
Eliminates Expensive AC-Coupling Capacitors
Blanking Level at Ground with Single Supply
♦ Composite and Y/C Signals
♦ Advanced Power-Down Modes for Extended
Battery Life
♦ Low Supply Current in Shutdown Mode, < 1µA (typ)
♦ Filter Response Ideal for NTSC and PAL
♦ +6dB (MAX7481) or +7dB (MAX7482) Gain
♦ +2.7V to +3.6V Single-Supply Operation
♦ Small, 28-Pin, TQFN Package (5mm x 5mm)
Ordering Information
PART
TEMP RANGE
PIN-
PACKAGE
PKG
CODE
MAX7481ETI+ -40°C to +85°C 28 TQFN-EP* T2855-6
MAX7482ETI+ -40°C to +85°C 28 TQFN-EP* T2855-6
+Denotes lead-free package.
*EP = Exposed pad.
Pin Configuration appears at end of data sheet.
Simplified Block Diagram
MAX7481
MAX7482
PLAYBACK SIGNAL FLOW
OUT1
IN3
IN5
OUT3
0V
VIDEO
DAC
IN2
VIDEO
ADC
0V
OUT5
LPF
OUT2
IN4
0V
RECORD SIGNAL FLOW
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
1 page  
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Bidirectional Video Filters/Buffers for Composite
and S-Video Portable Media Devices
Typical Operating Characteristics (continued)
(VCC = CPVCC = +3.0V, TA = +25°C, unless otherwise noted.)
0
0.05
0
-0.05
-0.10
-0.15
-0.20
-0.25
DIFFERENTIAL GAIN
vs. DIFFERENTIAL PHASE
-0.01 -0.05 -0.02 -0.05 -0.13
0.1 0
0
-0.1
-0.2
-0.3
-0.4
-0.5
1st
-0.07 -0.12 -0.15 -0.24 -0.37
2nd 3rd 4th 5th 6th
STEP
FIELD SQUARE-WAVE RESPONSE
MAX7481 toc10
FIELD SQUARE-WAVE RESPONSE
MAX7481 toc11
IN1
500mV/div
IN3
500mV/div
2ms/div
OUT1
500mV/div
2ms/div
OUT4
500mV/div
Pin Description
PIN
1
2, 14, 17, 20
3
4
5
6
7, 13, 23
8
9
10
11
12
15
16
18
19
21
NAME
CPVCC
GND
IN2
IN1
OUT5
OUT4
VCC
BIAS
SHDN
P/R
FUNCTION
Charge-Pump Positive Power Supply. Bypass with a 1µF capacitor to CPGND.
Ground
Video Input 2
Video Input 1
Video Output 5
Video Output 4
Positive Power Supply. Bypass with a 1µF capacitor to GND.
Bias Current Setting Control. Connect a 100kΩ ±1% resistor from BIAS to GND.
Shutdown Input. Drive high to put device in shutdown mode.
Playback/Record Logic Input. Drive high for record mode and pull low for playback mode.
CVBSON CVBS Select Logic Input. Drive high for composite video on output OUT3 in playback mode and output
OUT4 in record mode. See Table 1.
YCON
Y/C Select Logic Input. Drive high to enable Y/C video on outputs OUT1 and OUT2 in playback mode and
on outputs OUT4 and OUT5 in record mode. See Table 1.
IN3
OUT1
OUT3
IN5
OUT2
Video Input 3
Video Output 1
Video Output 3
Video Input 5
Video Output 2
_______________________________________________________________________________________ 5
5 Page 
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Bidirectional Video Filters/Buffers for Composite
and S-Video Portable Media Devices
Functional Diagram/Typical Application Circuit
IN1
DAC
150Ω
OUT4
ADC
0.1μF
P/R
CVBSON
YCON
IN2
DAC
150Ω
OUT5
ADC
0.1μF
CLAMP
+6dB
LOWPASS FILTER
MAX7481
MAX7482
+6dB OR +7dB
OUT1
75Ω
IN3
C3 = 0.1μF
+6dB OR +7dB
OUT3
75Ω
CLAMP
+6dB
LOWPASS FILTER
IN5
C5 = 0.1μF
+6dB OR +7dB
OUT2
75Ω
REGULATOR
IN4
C4 = 0.1μF
VCC GND
CHARGE PUMP
BIAS SHDN CPVCC CPGND C1P C1N CPVSS
1μF
VCC
100kΩ
C1 = 1μF
VCC
C2 = 1μF
VSS
1μF
Y
CVBS
C
Applications Information
Power-Supply Considerations
The MAX7481/MAX7482 operate from a +2.7V to +3.6V
single supply and require proper layout and bypassing.
For best performance, place components as close as
possible to the device.
Proper grounding improves performance, minimizes
crosstalk, and prevents any switching noise from cou-
pling into the video signal. Connect GND (pin 2) and
CPGND together at a single point on the PCB. Route
CPGND and all traces carrying switching transients
away from GND traces and components in the video
signal path. Bypass each analog supply (VCC) with a
1µF capacitor to GND, placed as close as possible to
the device. Bypass the charge-pump supply (CPVCC)
with a 1µF capacitor to CPGND, placed as close as
possible to the device. Connect CPVSS to VSS and
bypass with a low-ESR 1µF capacitor to CPGND as
close as possible to the device.
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet MAX7482.PDF ] | |
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