MAX7428EKA/T ,Standard Definition Video Reconstruction Filters and Buffersapplications. ThePackage (MAX7432)MAX7432 triple filter is optimized for component (YP Pb ror embed ..
MAX7428EKA+T ,Standard Definition Video Reconstruction Filters and BuffersApplicationsMSPB is a trademark of Maxim Integrated Products, Inc.Set-Top BoxesµMAX is a registered ..
MAX7428EKA-T ,Standard Definition Video Reconstruction Filters and BuffersELECTRICAL CHARACTERISTICS(V = +5V ±10%, R = 300kΩ ±1%, C = 0.1µF, C = (1nF to 1µF) ±1%, C = 0 to 2 ..
MAX7428EKA-T ,Standard Definition Video Reconstruction Filters and BuffersFeaturesThe MAX7428/MAX7430/MAX7432 filters are low-cost, Ideal for CVBS, Y/C (S-Video), and RGB ..
MAX742CPP ,Switch-Mode Regulator with +5V to 【12V or 【15V Dual Outputfeatures undervoltage lockout, thermal shut-down, and programmable soft-start. MAX742C/D 0°C to +70 ..
MAX742CWP ,Switch-Mode Regulator with +5V to 【12V or 【15V Dual OutputBlock DiagramDistributed Power Systems+5VComputer PeripheralsINPUTMAX742CC-__________________Pin Co ..
MB6M ,MINIATURE GLASS PASSIVATED SINGLE-PHASE BRIDGE RECTIFIERThermal Characteristics (TA = 25°C unless otherwise noted)Parameter Symbol MB2M MB4M MB6M UnitDevic ..
MB6S ,Bridge RectifiersThermal Characteristics (T = 25°C unless otherwise noted)AParameter Symbol MB2S MB4S MB6S UnitDevic ..
MB7117E , Schottky TTL 2048-Bit Bipolar Programmable Read-Only Memory
MAX7428EKA/T-MAX7428EKA-T-MAX7430EUB-MAX7432EUD
Standard Definition Video Reconstruction Filters and Buffers
General DescriptionThe MAX7428/MAX7430/MAX7432 filters are low-cost,
high-performance replacements for standard discrete fil-
ter and buffer solutions. The MAX7428/MAX7430/
MAX7432 are ideal for anti-aliasing and DAC smoothing
video applications, when analog video is reconstructed
from a digital data stream.These devices require a sin-
gle +5V supply and the filters have a cutoff frequency
optimized for NTSC, PAL, and standard definition digital
TV (SDTV) video signals. The MAX7428/MAX7430/
MAX7432 feature Maxim’s Single Pin Bus (MSPB™)
interface to digitally control channel selection (IN_A or
IN_B), adjust high-frequency boost, bypass the filter,
configure luma vs. chroma operation, and control the
output disable.The MAX7428 single-channel filter is
ideal for composite (CVBS) video signals. The MAX7430
dual filter is optimized for S-Video (Y/C) applications. The
MAX7432 triple filter is optimized for component (YPbPr
or embedded synchronous RGB) video signals. The
MAX7428 is available in a tiny 8-pin SOT23 package, the
MAX7430 is available in a miniature 10-pin µMAX pack-
age, and the MAX7432 is available in a 14-pin TSSOP
package. The MAX7428/MAX7430/MAX7432 are fully
specified over the -40°C to +85°C extended temperature
range.
ApplicationsSet-Top Boxes
DVD Players
Hard-Disk Recorders
Camcorders
FeaturesIdeal for CVBS, Y/C (S-Video), and RGB (Y PbPr)
Outputs for NTSC, PAL, and SDTV6th-Order Lowpass Filter Drives Two 150ΩVideo LoadsFour Levels of Passband High-Frequency
Boost Control Input 2 to 1 Multiplexer Output DisableFilter Bypassing+5V Single-Supply VoltageTiny 8-Pin SOT23 Package (MAX7428), 10-Pin
µMAX Package (MAX7430), and 14-Pin TSSOP
Package (MAX7432)
MAX7428/MAX7430/MAX7432
Standard Definition Video Reconstruction
Filters and Buffers
Functional Diagrams
Ordering Information19-2119; Rev 2; 9/02
Pin Configurations appear at end of data sheet.MSPB is a trademark of Maxim Integrated Products, Inc.
MAX7428/MAX7430/MAX7432
Standard Definition Video Reconstruction
Filters and Buffers
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS(VCC= +5V ±10%, RREXT= 300kΩ±1%, CIN= 0.1µF, CREXT= (1nF to 1µF) ±1%, CLOAD= 0 to 20pF; BOOST0_, BOOST1_ = 0, 0;
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.
VCCto GND...........................................................................+6V
All Other Pins to GND.................................-0.3V to (VCC + 0.3V)
Maximum Current Into Any Pin.........................................±50mA
Continuous Power Dissipation (TA= +70°C)
8-Pin SOT23 (derate 9.71mW/°C above +70°C)..........777mW
10-Pin µMAX (derate 6.94mW/°C above +70°C)......555.5mW
14-Pin TSSOP (derate 9.1mW/°C above +70°C).........727mW
Operating Temperature Range...........................-40°C to +85°C
Storage Temperature Range.............................-65°C to +150°C
Junction Temperature......................................................+150°C
Lead Temperature (soldering, 10s).................................+300°C
MAX7428/MAX7430/MAX7432
Standard Definition Video Reconstruction
Filters and Buffers
ELECTRICAL CHARACTERISTICS (continued)(VCC= +5V ±10%, RREXT= 300kΩ±1%, CIN= 0.1µF, CREXT= (1nF to 1µF) ±1%, CLOAD= 0 to 20pF; BOOST0_, BOOST1_ = 0, 0;= TMINto TMAX, unless otherwise noted. Typical values are at TA= +25°C.) (Note 2)
MSPB INTERFACE TIMING SPECIFICATIONS(VCC= +5V ±10%, RREXT= 300kΩ±1%, CREXT= (1nF to 1µF) ±1%, CLOAD= 0 to 20pF, TA= TMINto TMAX, unless otherwise noted.
Note 1:One horizontal line = 63.5µs.
Note 2:MAX7428 devices are 100% production tested at TA= +25°C and are guaranteed by design from TA= TMINto TMAX.
MAX7428/MAX7430/MAX7432
Standard Definition Video Reconstruction
Filters and Buffers
Typical Operating Characteristics(VCC= +5V, RREXT= 300kΩ; BOOST0_, BOOST1_ = 0, 0; VIN_= 1Vp-p, TA= +25°C, unless otherwise noted.)
MAX7428/MAX7430/MAX7432
Standard Definition Video Reconstruction
Filters and BuffersOUTPUT IMPEDANCE vs. FREQUENCY
MAX7428/30/32 toc10
FREQUENCY (MHz)
IMPEDANCE
200ns/div
OUTPUT TRANSIENT DUE TO
INPUT MUX SWITCHINGOUT_
500mV/div
MAX7428/30/32 toc11
PASSBAND CHANNEL-TO-CHANNEL
CROSSTALK vs. FREQUENCY
MAX7428/30/32 toc12
FREQUENCY (MHz)
CROSSTALK (dB)-85
Typical Operating Characteristics (continued)
(VCC= +5V, RREXT= 300kΩ; BOOST0_, BOOST1_ = 0, 0; VIN= 1Vp-p, TA= +25°C, unless otherwise noted.)
Figure 1. MAX7428 Typical Application Circuit
MAX7428/MAX7430/MAX7432
Detailed DescriptionThe MAX7428/MAX7430/MAX7432 filter and buffer the
outputs of DAC encoder chipsets that process digital
video information in applications such as set-top boxes,
hard-disk recorders, DVD players, recorders, and digi-
tal VCRs. These devices also filter and “clean-up” ana-
log video signals. Each channel in the MAX7428/
MAX7430/MAX7432 includes an input mux to select the
input channel, a 6th-order Sallen-Key filter with four
adjustable high-frequency boost levels, an output
buffer with a 6dB gain, a sync detector and clamp, and
an external resistor to set internal bias levels. Output
disable adds additional multiplexing in a wired-OR con-
figuration. Filter bypass, in conjunction with the two
inputs, can be used to provide filtered and unfiltered
video signal processing. Maxim’s Single Pin Bus
(MSPB) interface controls all of the above features. An
external capacitor is used to assign each device a
unique address that allows control of up to 16 devices
on the same bus. Typical application circuits for the
MAX7428/MAX7430/MAX7432 are shown in Figures 1,
2, and 3.
Input ConsiderationsUse a 0.1µF ceramic capacitor to AC-couple the input
to the MAX7428/MAX7430/MAX7432. This input capaci-
tor stores a DC level to level-shift the input signal to an
optimal point between VCCand GND. The ABSEL bit on
the Control Register sets which channel (IN_A or IN_B)
is selected (Control Register section). The IN_A and
IN_B inputs have a typical input resistance of 50kΩ.
Standard Definition Video Reconstruction
Filters and Buffers
Pin Description (continued)
MAX7428/MAX7430/MAX7432
Standard Definition Video Reconstruction
Filters and Buffers
MAX7428/MAX7430/MAX7432
Standard Definition Video Reconstruction
Filters and Buffers
MAX7428/MAX7430/MAX7432
Standard Definition Video Reconstruction
Filters and Buffers
Filter
Filter ResponseThe reconstruction filter consists of a 6th-order
Butterworth filter in three second-order stages. The
Butterworth filter features a maximally flat passband for
NTSC and PAL bandwidths. The stopband offers typical-
ly 50dB of attenuation at sampling frequencies of 25MHz
and above (see Typical Operating Characteristics).
The corner frequency is not critical since the response
of the filter meets both the stopband and passband
specifications. The MAX7428/MAX7430/MAX7432
incorporate an autotrimming feature that reduces the
corner frequency variation digitally. It is possible,
although not likely, that a discrete shift in the corner fre-
quency may occur due to an external environmental
change. The autotrimming operates continuously so
that the corner frequency remains centered over the full
operating temperature range.
High-Frequency BoostThe high-frequency boost compensates for signal degra-
dation and roll-off in the signal path prior to the MAX7428/
MAX7430/MAX7432. High-frequency boost is program-
mable in four steps to increase image sharpness.
Output BufferThe output buffer is able to drive two 150Ωvideo loads
with a 2Vp-p signal. The +6dB gain of the output buffer
is independent of the filter bypass or input selection.
The output buffer drives the 75Ωbackmatch resistors
and series capacitor (typically 220µF). The MAX7428/
MAX7430/MAX7432 are able to drive the video load
directly without using the 220µF capacitor. This feature
is common in SCARTapplications. The OUTDISABLE bit
of the control register disables the output (mute) (see
Control Register section).
Filter BypassThe MAX7428/MAX7430/MAX7432 offer selectable filter
bypassing that allows either of the video inputs to be fil-
tered or unfiltered. The 1MΩoptional input resistors are
needed only in filter bypass mode to provide a dis-
charge path for the input coupling capacitors.
Serial InterfaceMaxim’s Single Pin Bus (MSPB) interface uses DATA to
transfer data to and from the microprocessor (µP) and
the MAX7428/MAX7430/MAX7432. This negative logic
protocol uses three different pulse widths to represent
a logic “1”, logic “0”, and control commands. MSPB
allows up to 16 devices to be connected on the same
bus by assigning a unique 4-bit identification address
to each device. The µP can communicate to each
device individually or by sending a “broadcast” mes-
sage to all the devices. The unique address for each
device is set by means of the time constant set by the
external capacitor connected in parallel with the exter-
nal 300kΩresistor (see Initializing the MAX7428/
MAX7430/MAX7432section).
MAX7428 Control RegisterTable 1 defines the structure of the MAX7428 8-bit con-
trol register programmed by MSPB. This register con-
trols the selection of INA or INB, SYNCIO functionality,
filter bypassing, clamp-level selection, high-frequency
boost control, and output disable. See Maxim’s Single
Pin Bus Interface (MSPB) section for detailed program-
ming instructions.
SYNCIO:SYNCIO Select bit. A logic 0 sets the SYNCIO
pin to function as an output while a logic 1 sets SYNCIO
to function as an input.
ABSEL:Channel Select bit. A logic 0 selects the input
at INB to be processed while a logic 1 selects the input
at INA to be processed.
BYPASS:Filter Bypass Select bit. A logic 1 selects the
filter while a logic 0 bypasses the filter.
Table 1. MAX7428 Control Register
MAX7428/MAX7430/MAX7432
Standard Definition Video Reconstruction
Filters and Buffers
CLEVEL:Clamp Level bit. A logic 0 selects a clamp
level of 1V while a logic 0 selects a clamp level of 1.5V
at the output.
[BOOST1, BOOST0]:High-Frequency Boost Control bits.
The adjust bits select the amount of high-frequency boost
for the filter. Table 2 defines four levels of adjustment.
OUTDISABLE:Output Disable bit. A logic 0 selects
normal operation while a logic 1 places the output in a
high-impedance state.
MAX7430 Control Register Table 3 defines the structure of the MAX7430 16-bit con-
trol register programmed by MSPB. This register controls
the selection of IN_A or IN_B, selection of filter 1 or 2, filter
bypassing, clamp-level selection, high-frequency boost
control, and output disable. See Maxim’s Single Pin Bus
Interface (MSPB)section for detailed programming
instructions.
ABSEL_:Channel Select bit. A logic zero selects the
input at IN_B to be processed while a logic 1 selects
the input at IN_A to be processed.
BYPASS_:Filter Bypass Select bit. A logic 1 selects
the channel filter while a logic 0 bypasses the channel
filter.
CLEVEL_:Clamp Level bit. A logic 0 selects a channel
clamp level of 1V while a logic 0 selects a channel
clamp level of 1.5V at the output.
[BOOST1_, BOOST0_]:High-Frequency Boost Control
bits. The adjust bits select the amount of high-frequency
boost for the channel filter. Table 4 defines four levels of
adjustment.
OUTDISABLE_:Output Disable bit. A logic 0 selects
normal channel output operation while a logic 1 puts
the channel output in a high-impedance state.
MAX7432 Control Register Table 5 defines the structure of the MAX7432 24-bit
control register programmed by MSPB. This register
controls the selection of IN_A or IN_B, selection of filter
1, 2, or 3, filter bypassing, clamp-level selection, high-
frequency boost control, and output disable. See
Maxim’s Single Pin Bus Interface (MSPB)section for
detailed programming instructions.
ABSEL_:Channel Select bit. A logic zero selects the
input at IN_B to be processed while a logic 1 selects
the input at IN_A to be processed.
BYPASS_:Filter Bypass Select bit. A logic 1 selects
the channel filter while a logic 0 bypasses the channel
filter.
CLEVEL_:Clamp Level bit. A logic 0 selects a channel
clamp level of 1V while a logic 0 selects a channel
clamp level of 1.5V at the output.
[BOOST1_, BOOST0_]:High-Frequency Boost Control
bits. The adjust bits select the amount of high-frequency
boost for the channel filter. Table 6 defines four levels of
adjustment.
OUTDISABLE_:Output Disable Bit. A logic 0 selects
normal channel output operation while a logic 1 puts
the channel output in high-impedance state.
Table 3. MAX7430 Control Register
MAX7428/MAX7430/MAX7432
Standard Definition Video Reconstruction
Filters and Buffers
Applications Information
Maxim’s Single Pin Bus (MSPB)
Serial InterfaceThe MSPB interface uses three pulses of different
widths to represent commands and data bits. Figure 4
shows the set of pulses that the single pin interface
uses to communicate with the device. A combination of
the one pulse (t1), zero pulse (t0), transaction pulse (tT),
and prompt pulse (tP), writes to, reads back from, and
sends broadcast data to the devices on the bus.
Note:The zero pulse and prompt pulse are the same.
Initialization pulses are significantly longer and are
used only on power-up or software reset.
Initializing the
MAX7428/MAX7430/MAX7432Initialization is performed only after power-up or software
reset. It assigns a unique address to each device on the
bus. The time constant of the capacitor connected to
REXTin parallel with the 300kΩresistor determines the
order in which the devices are initialized (address
assigned). The device with the largest time constant is
initialized first and so on, in descending order. Table 7
shows the “Initialize Wait” and “Initialize Time” pulse
widths needed for a specific capacitor value and toler-
ance. Program each device on the bus with this com-
mand sequence starting with the device with the biggest
capacitor. To reinitialize a device, cycle the power or use
a software reset. The following is the command
sequence and timing diagram (Figure 5) for initialization
as shown below. Chip ID is entered LSB first.
Note:If there is only one device on the bus, no initial-
ization is needed. Communicate to the device using the
broadcast command described on page 13.
Table 5. MAX7432 Control Register
