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參數(shù)資料
| 型號： | TEA6100 |
| 文件頁數(shù)： | 24/27頁 |
| 文件大?。?/td> | 513K |
| 代理商： | TEA6100 |
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August 1987
24
Philips Semiconductors
Product specification
FM/IF system and microcomputer-based
tuning interface
TEA6100
PROGRAMMING INFORMATION
Converting the read out of the counters into frequency
The counter resolution at the input is defined as:
resolution = divider ratio of N2/window
For every increment of the counter the counted frequency increases relative to the resolution in Hertz, as shown in
example:
window = 20 ms; N2 = 128; IF frequency = 10,7 MHz; resolution = 128/0,02 = 6,4 kHz per count
The counter consists of 8 bits. Therefore, the maximum frequency range that can be counted is
256
×
resolution = 1,6384 MHz. In the example the frequency to be counted is 10,7 MHz, therefore, the counter will
overflow (in the example above, 7 times). The real measured frequency is:
f
real
= (read out
+
overflow
×
256)
×
resolution
The overflow indicates the off-set on the frequency scale which must be added to the read out. Due to the bandwidth of
the IF filter, the frequencies at the input to the TEA6100 are known, for example:
IF filter for FM has a center frequency of 10,7 MHz and
3 dB bandwidth of 300 kHz. Only the frequencies of 10,7 MHz
±
150 kHz occur at the input of the TEA6100. For this reason it is not necessary to count the overflow.
The read out of the counter has to be translated into frequency. This translation depends upon the counter resolution.
The preferred way to calculate the input frequency is to:
calculate the read out of the target IF frequency. Compare this value with that of the measured read out and multiply
the difference by the resolution.
The formulae for calculating the target IF read out and the resolution are as follows (A, D, E, F and G refer to the bits of
the I
2
C bus input data as shown in Fig.3 and 4 and to the counter/timer block diagram shown in Fig.6. An, Dn, En, Fn
and Gn are inverted values of the variables A, D, E, F and G. Table 3 shows the following formulae calculated for a
reference frequency of 40 kHz):
N1 = (An
×
4
+
A
×
5)
×
(En
×
4
+
E
×
5)
×
8
×
(2
[E
×
2
+
G
×
1]
)
×
(F
×
1
+
Fn
×
8)
Window (T) = N1/F
ref
N2 = (E
×
16
×
8
+
En
×
[Dn
×
1
+
D
×
16])
×
(G
×
2
+
Gn
×
1)
Target decimal read out (TDEC) = T
×
(TIFF/N2
+
(E
×
247
+
En
×
79). TIFF is the symbol for target IF frequency
Target read out hexadecimal (THEX), convert the target decimal read out to hexadecimal and use the 2 least
significant digits (Do not use overflow value). The symbol for measured hexadecimal is MHEX
Resolution (R) = N2/T
Measured frequency (F
I
) = (TIFF)
+
R
×
(MHEX
THEX).
Note
Care should be taken if TIFF
+
1
2
filter bandwidth is greater than the frequency for the read out of hexadecimal value FF,
or if TIFF
1
2
filter bandwith is less than the frequency at read out for hexadecimal value 00.
Counter accuracy (AW and AN), with bit 7 (G) the accuracy can be chosen with the same resolution. If bit 7 is logic 1
the accuracy is HIGH and if bit 7 is logic 0 then the accuracy is LOW.
bit 7 = 0, AN =
±
(N2/T)
bit 7 = 1, AW =
±
(
1
2
×
N2/T)
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