參數(shù)資料
型號： OM4031T
廠商： NXP SEMICONDUCTORS
元件分類： 數(shù)字信號處理外設(shè)
英文描述： Digital post-detection filter for FSK data receivers
中文描述： 1-BIT, DSP-DIGITAL FILTER, PDSO8
封裝： 3.90 MM, PLASTIC, SOT-96-1, SOP-8
文件頁數(shù)： 10/16頁
文件大?。?/td> 68K
代理商： OM4031T
October 1994
10
Philips Semiconductors
Preliminary specification
Digital post-detection filter
for FSK data receivers
OM4031T
APPLICATION INFORMATION
Fig.5 Typical application example.
andbook, full pagewidth
MLC277
OM4031T
DIN
CLK
CE
A1
A0
DOUT
DD
V
MICROCONTROLLER
38.4 kHz
CC
V
FSK
RECEIVER
RF
CE
DO
CC
V
pull
R
The OM4031T will generally operate from the same power
supply (V
CC
) as the FSK data receiver providing its input
data. The open-drain data output allows level shifting of
the data to suit a microcontroller operating at a higher
power supply voltage (V
DD
).
The value of the pull-up resistor R
pull
on output DOUT is
determined by the type and number of input circuits to be
driven. The required signal rise time must be balanced
against the current drawn by the pull-up.
For the highest rate (2400 bits/s) the signal rise time
should preferably be below 50
μ
s.
For a single CMOS input with a 10 pF capacitance
R
pull
= 1 M
gives a rise time of approximately 30
μ
s
(3
×
t
RC
). At V
DD
= 2.0 V this corresponds with a current
of 2
μ
A.
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