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AS3977 数据表(PDF) 35 Page - ams AG

部件名 AS3977
功能描述  Multi-Channel Narrowband FSK Transmitter
PDF  47 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
制造商  AMSCO [ams AG]
网页  http://www.ams.com
标志 AMSCO - ams AG

AS3977 数据表(HTML) 35 Page - ams AG

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Revision 3.6
35 - 47
AS3977
Data Sheet - A p p l i c a t i o n I n f o r m a t i o n
9.8.1 Implementation
Starting from the equation,
(EQ 10)
The equation now rewritten by taking configuration registers and implementation details into account:
(EQ 11)
Reference frequency fREF (DIVR<2:0>)
The reference frequency fREF is determined by the crystal frequency fXTAL and the reference divider division ratio setting DIVR<2:0> and can be
calculated with the help of:
(EQ 12)
The value of fREF should be in the range of 3 MHz to 5, 75 MHz to achieve an optimum on noise performance and current consumption
DIVR < 2:0 > =
(EQ 13)
9.8.1.1 M-counter and Value of INT<9>
The value of the M-counter is given by:
M = (INT < 9 > +4)
(EQ 14)
The Bit INT<9> can be calculated as,
INT < 9 > = M - 4
9.8.1.2 N-counter and Value of INT<3:0>
N = (INT < 3:0 > +INT < 8 > .6+10)
(EQ 15)
Taken the default value of INT<8>=0 into account, the value of the INT3<..0> can be calculated by:
INT < 3:0 > = N-10
9.8.1.3 A- Counter and Value of INT<7:4>
AC = INT < 7:4 > +1 +(INT <8> +1) x 3
(EQ 16)
Taken the default value of INT<8>=0 into account, the value of the INT<7:40> can be calculated by:
INT < 7:4 > = AC-1
9.8.1.4 Fractional Part and Values of FRAC<15:0>
(EQ 17)
Taken the default value of INT<8>=0 into account, multiplying the Fractional part with 2
16 gives the register values for the Fractional and
synthesizer value and can be calculated by:
FRAC < 15:0 >= DRFRAC x 2
16
f
RF
Pf
REF
M N
AC
FRAC
++
⋅
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=
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INT
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