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PDF MAX11509 Data sheet ( Hoja de datos )
| Número de pieza | MAX11509 | |
| Descripción | HD/PS/SD/BP Video Filters | |
| Fabricantes | Maxim Integrated Products | |
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19-4346; Rev 0; 10/08
EVAALVUAAILTAIOBNLEKIT
Low-Cost, 3-Channel, HD/PS/SD/BP
Video Filters with Buffer
General Description
The MAX11508/MAX11509 integrated 3-channel video
filters for high-definition (HD), progressive-scan (PS),
standard-definition (SD), and bypass (BP) video
include an output buffer with +6dB gain and are ideal
for digital video disc (DVD) players, set-top box (STB)
receivers, high-definition television (HDTV), digital
video recorders (DVRs), and similar devices.
The MAX11508/MAX11509 video inputs feature a trans-
parent clamp compatible with AC- and DC-coupled
www.DiantpauStheseigt4nUa.lcsoamnd allow DAC outputs to be directly cou-
pled, eliminating the need for bulky coupling capaci-
tors. The filter bandwidths are selectable to HD, PS,
and SD. A BP mode is provided for 1080p and high-
bandwidth RGB signals. Selectable input bias circuitry
on 2 filter channels offers simple connection to bipolar
video signals such as C, Pb, and Pr.
The MAX11508 filters provide -3dB bandwidths of 9MHz
(SD), 16MHz (PS), 33MHz (HD), and 60MHz (BP). The
MAX11509 filters provide -3dB bandwidths of 10MHz
(SD), 17MHz (PS), 34MHz (HD), and 60MHz (BP).
Each channel includes an output buffer with +6dB gain
that provides a full 2VP-P video signal into a 150Ω video
load. The buffers drive either AC- or DC-coupled loads
and assure a blanking level of below 1V after the back-
match resistor. The shutdown mode provided reduces
device current to 1µA (typ).
The MAX11508 offers a flat passband and the
MAX11509 features +0.8dB peaking to compensate for
DAC rolloff. The MAX11508/MAX11509 operate from a
5V power supply and operate over the upper commer-
cial (0°C to +85°C) temperature range. The parts are
offered in the 14-pin TSSOP package.
Applications
Cable and Satellite STB Receivers
HDTV
DVD Players
Personal Video Recorders
DVRs
Video-On-Demand
HD Recorders
Typical Operating Circuit appears at end of data sheet.
Features
♦ Three Selectable 6th-Order 9MHz/16MHz/33MHz
(SD/PS/HD) Filters
♦ Bypass Mode for High Bandwidth Signals
♦ Transparent Input Clamp
♦ Output Buffers Drive a Standard 150Ω Video Load
♦ ±12kV HBM ESD Protection on Outputs
♦ AC- or DC-Coupled Inputs
♦ AC- or DC-Coupled Outputs
♦ +0.8dB Peaking Passband Response (MAX11509)
in SD, PS, and HD Modes
♦ Single +5V Power Supply
♦ Lead-Free, 14-Pin TSSOP Package
Ordering Information
PART
TEMP RANGE
PIN-PACKAGE
MAX11508UUD+
0°C to +85°C
14 TSSOP
MAX11509UUD+
0°C to +85°C
14 TSSOP
+Denotes a lead-free/RoHS-compliant package.
Pin Configuration
TOP VIEW
+
VCC 1
FSEL0 2
Y/G_IN 3
Pb/B_IN 4
MAX11508
MAX11509
Pr/R_IN 5
BIAS 6
N.C. 7
14 N.C.
13 FSEL1
12 Y/G_OUT
11 Pb/B_OUT
10 Pr/R_OUT
9 SHDN
8 GND
TSSOP
________________________________________________________________ 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.
1 page  
Low-Cost, 3-Channel, HD/PS/SD/BP
Video Filters with Buffer
Typical Operating Characteristics (continued)
(VCC = 5V, RL = 150Ω to GND, output DC-coupled, TA = +25°C, unless otherwise noted.)
MAX11508
HD PASSBAND RESPONSE
7
5
www.DataS3heet4U.com
1
-1
-3
0.1
10
0
-10
-20
-30
-40
-50
-60
0.1
7
1 10
FREQUENCY (MHz)
MAX11508
BP FREQUENCY RESPONSE
1 10
FREQUENCY (MHz)
MAX11509
BP PASSBAND RESPONSE
100
100
5
3
1
-1
-3
0.1
1 10
FREQUENCY (MHz)
100
10
0
-10
-20
-30
-40
-50
-60
0.1
7
MAX11509
HD FREQUENCY RESPONSE
1 10
FREQUENCY (MHz)
MAX11508
BP PASSBAND RESPONSE
100
5
3
1
-1
-3
0.1
1 10
FREQUENCY (MHz)
100
MAX11508
SD GROUP DELAY vs. FREQUENCY
120
100
80
60
40
20
0
-20
0.1
1 10
FREQUENCY (MHz)
100
MAX11509
HD PASSBAND RESPONSE
7
5
3
1
-1
-3
0.1
1 10
FREQUENCY (MHz)
100
MAX11509
BP FREQUENCY RESPONSE
10
0
-10
-20
-30
-40
-50
-60
0.1
1 10
FREQUENCY (MHz)
100
MAX11509
SD GROUP DELAY vs. FREQUENCY
120
100
80
60
40
20
0
-20
0.1
1 10
FREQUENCY (MHz)
100
_______________________________________________________________________________________ 5
5 Page 
Low-Cost, 3-Channel, HD/PS/SD/BP
Video Filters with Buffer
Filters
The MAX11508 filter characteristic provides excellent
time-domain response with low overshoot and guaran-
tees minimal attenuation in the passband. The
MAX11509 filters offer a small gain peaking response to
counter system rolloff.
Select filter frequency with inputs FSEL0 and FSEL1, as
shown in Table 1.
Standard-Definition (SD) Filters
www.DTahtaeShMeAeXt41U1.c5o0m8 SD filters have a 9MHz (typ) -3dB fre-
quency, while the MAX11509 SD filters offer a 10MHz
(typ) -3dB frequency and a +0.8dB high-frequency
boost at 5MHz (typ). Both devices have a stopband
attenuation of +48dB (typ) at 27MHz.
Progressive-Scan (PS) Filters
The MAX11508 PS filters have a 16MHz (typ) -3dB fre-
quency, while the MAX11509 PS filters offer a 17MHz
(typ) -3dB frequency and a +0.8dB high-frequency
boost at 8.5MHz (typ). Both devices have a stopband
attenuation of +44dB (typ) at 54MHz.
High-Definition (HD) Filters
The MAX11508 HD filters have a 33MHz (typ) -3dB fre-
quency, while the MAX11509 HD filters offer a 34MHz
(typ) -3dB frequency and a +0.8dB high-frequency
boost at 20MHz (typ). Both devices have a stopband
attenuation of +45dB (typ) at 74.25MHz.
Bypassing the Filters
The MAX11508/MAX11509 filter bypass circuitry offers
a 60MHz (typ) -3dB frequency. Bypassed filters offer no
gain peaking.
Output Buffer
The MAX11508/MAX11509 feature output buffers with
+6dB gain that drive a standard 150Ω video load at
2VP-P. A typical load consists of a 75Ω backmatch
resistor, an optional 220µF or larger coupling capacitor,
and a 75Ω termination resistor.
An offset of 550mV is added at the output. The offset
ensures that the blanking level on the output is less
than 1V after the backmatch resistor, thus meeting digi-
tal TV specifications allowing the devices to drive video
loads directly without using costly AC-coupling capaci-
tors. The basic output voltage equation of all filters is:
VOUT = (2 x VIN) + 0.55V
Typical voltage waveforms are shown in Figures 2 and 3.
Shutdown
Forcing digital input SHDN low places the MAX11508/
MAX11509 into low-power shutdown mode. In shut-
down, the device consumes only 1µA (typ), and the
outputs are internally connected to GND through
1.58kΩ resistors. In shutdown, the input clamps are dis-
abled and the inputs are internally connected to GND
through 350kΩ resistors. When shutdown is forced low
while BIAS is low, the bias network remains active, but
the bias voltage changes from its nominal 0.59V to
0.475V (typ).
Applications Information
Output Considerations
DC- or AC-couple the MAX11508/MAX11509 outputs.
These devices, with +6dB gain, are typically connected
to a 75Ω series backmatch resistor followed by a video
cable. Choose an AC-coupling capacitor value that
ensures that the lowest frequency content in the video
signal is passed and the field-time distortion is kept
within desired limits when using an AC connection. The
selection of this value is a function of the input imped-
ance, and more importantly, the input leakage of the
circuit being driven. Common industry practice is to
use a 220µF or larger capacitor.
The MAX11508/MAX11509 outputs are fully protected
against short circuits to ground. The short-circuit pro-
tection circuitry limits the output current to 75mA (typ)
per output. Shorting more than one output to ground
simultaneously may exceed the maximum package
power dissipation.
PCB Layout Recommendations
Connect the power and ground traces to large copper
areas to enhance power dissipation. Bypass VCC to
GND with 0.1µF and 1.0µF capacitors. Place the 0.1µF
capacitor closest to VCC. Use surface-mount capaci-
tors for their low inductance. Place traces carrying
video signals appropriately to avoid mutual coupling.
When inputs are AC-coupled, place the capacitors as
close as possible to the device and keep traces short
to minimize parasitic capacitance and inductance.
Refer to the MAX11508/MAX11509 evaluation kit data
sheet for PCB layout.
Chip Information
PROCESS: BiCMOS
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet MAX11509.PDF ] | |
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