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MAX7428 Datasheet(PDF) 6 Page - Maxim Integrated Products

Part # MAX7428
Description  Standard Definition Video Reconstruction Filters and Buffers
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Manufacturer  MAXIM [Maxim Integrated Products]
Direct Link  https://www.maximintegrated.com/en.html
Logo MAXIM - Maxim Integrated Products

MAX7428 Datasheet(HTML) 6 Page - Maxim Integrated Products

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D/A
D/A
0.1
µF
0.1
µF
INA
INB
GND
ENCODER
75
75
75
**220
µF
75
C1
300k
SERIAL I/O
SYNC PULSE
IN OR OUT
OUT
VCC
5V
REXT
DATA
SYNCIO
**220
µF
*1M
*1M
MAX7428
Z0 = 75
Z0 = 75
5V
10k
***
C1 = 1nF TO 1
µF (SEE TABLE 3)
*NEEDED ONLY IN FILTER BYPASS MODE
**OPTIONAL CAPACITOR
***ONLY ONE PULLUP RESISTOR NEEDED PER BUS
Figure 1. MAX7428 Typical Application Circuit
Detailed Description
The 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 Considerations
Use 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 VCC and 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 50k
Ω.
Standard Definition Video Reconstruction
Filters and Buffers
6
_______________________________________________________________________________________
Pin Description (continued)
PIN
MAX7432
MAX7430
MAX7428
NAME
FUNCTION
13
9
OUT1
Buffer Output 1
14
10
2
VCC
+5V Supply Voltage
——
1
INA
Video Input A. Use a 0.1µF series input capacitor for proper operation.
——
3
INB
Video Input B. Use a 0.1µF series input capacitor for proper operation.
——
5
SYNCIO
Sync Pulse Input or Output
——
8
OUT
Buffer Output


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