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參數(shù)資料
| 型號： | MAX7432 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | Quadruple 2-Line To 1-Line Data Selectors/Multiplexers 20-LCCC -55 to 125 |
| 中文描述： | 標(biāo)準(zhǔn)清晰度、視頻重建濾波器及緩沖器 |
| 文件頁數(shù)： | 6/21頁 |
| 文件大小： | 444K |
| 代理商： | MAX7432 |
D/A
D/A
0.1
μ
F
0.1
μ
F
INA
INB
GND
ENCODER
75
75
75
**220
μ
F
75
C1
300k
SERIAL I/O
SYNC PULSE
IN OR OUT
OUT
V
CC
5V
REXT
DATA
SYNCIO
**220
μ
F
*1M
*1M
MAX7428
Z
0
= 75
Z
0
= 75
5V
10k
***
C1 = 1nF TO 1
μ
F (SEE TABLE 3)
*NEEDED ONLY IN FILTER BYPASS MODE
**OPTIONAL CAPACITOR
***ONLY ONE PULLUP RESISTOR NEEDED PER BUS
Figure 1. MAX7428 Typical Application Circuit
M
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 V
CC
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
.
Standard Definition Video Reconstruction
Filters and Buffers
6
_______________________________________________________________________________________
Pin Description (continued)
PIN
MAX7432
13
14
—
—
—
—
MAX7430
9
10
—
—
—
—
MAX7428
—
2
1
3
5
8
NAME
FUNCTION
OUT1
V
CC
INA
INB
SYNCIO
OUT
Buffer Output 1
+5V Supply Voltage
Video Input A. Use a 0.1μF series input capacitor for proper operation.
Video Input B. Use a 0.1μF series input capacitor for proper operation.
Sync Pulse Input or Output
Buffer Output
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