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參數(shù)資料
| 型號： | TDA7326 |
| 廠商： | 意法半導體 |
| 英文描述： | AM-FM Radio Frequency Synthesizer(AM-FM無線頻率合成器) |
| 中文描述： | 上午- FM收音機頻率合成器（上午，調(diào)頻無線頻率合成器） |
| 文件頁數(shù)： | 6/16頁 |
| 文件大?。?/td> | 183K |
| 代理商： | TDA7326 |
3.3 DIVIDER FROM V
CO
FREQUENCY TO
REFERENCE FREQUENCY
This divider provides a low frequency f
SYN
which
is phase compared with the reference frequency
f
REF
.
3.4 OPERATING MODE
Four operatingmodes are available:
- FM mode,
- AM swallow mode,
- AM direct mode,
- Standbymode
They are user programmable with the SWR/DIR
and AM/FM bits in the byte 2.
Standby mode: all functions are stopped. This al-
lowslow current consumption without lost of infor-
mation in all register,it is activatedby forcing bit 0
(AM/FM) and bit 1 (SWM/DIR) both at zero value.
3.4.1 FM and AM (SW) Operation (Swallow
Mode)
The FM or AM signal is applied to a four
modulus: 32/33/64/65 high speed prescaler,
which is controlled by a 6 bit divider ’A’.This
divider is controlled by the 6 bit SC register.
In parallel the output of the prescaler is con-
nected to a 8 bit divider ’B’. This divider is
controlled by the 8 bit PC register. For FM
mode with 25kHz reference frequency opera-
tion, the divider A is a 5 bit divider. The high
speed prescaler is working in : 32/33 dividing
mode. Bit 6 of the SC register has to be kept
to ”0”.
Dividing rangecalculation :
For FM mode with 12.5kHz reference fre-
quencyand SWswallow mode operation :
f
VCO
= [ 65
A
1
+ (B
1
+ 1 - A
1
)
64 ] . f
REF
or
Important : For correctoperation B
≥
64 and B
≥
A.
At FM mode with 25kHz referencefrequency:
f
VCO
= [ 33
A
2
+ (B
2
+ 1 - A
2
)
32 ]
f
REF
Important: For correct operation B
≥
32 and B
≥
A.
A and B arevariable values of the dividers.
To keep the actual tuning frequency after a
modification of the reference frequency, the
values of the dividers have to be modified in
the following way.
Switching from 25kHz to 12.5kHz reference
frequency: B
1
= B
2
, A
1
= A
2
2
Switching from 12.5kHz to 25kHz reference
frequency:
B
2
= B
1
, A
2
=
A
1
2
for odd valuesA
1
.
and A
2
=(
A
1
+
1
)
2
The AM signal is directly applied to the 14 bit
static divider ’C’. This divider is controlled by
both SC and PC registers.
Dividing range:
PREDIVIDER
R
OSC IN
REGISTER
SC5 .. SC0
COUNTER
A
PREDIVIDER
M/M+1
AM IN
FM IN
REGISTER
PC7 .. PC0
COUNTER
B
PD
fref
fsyn
D94AU101
Figure 2:
FM and AM (SW) operation(swallow mode)
MODE SECTION
STAND-BY
FM
AM SWALLOW
AM DIRECT
SWM/DIR
0
1
0
1
AM/FM
0
0
1
1
f
VCO
= (64
B
1
+ A
1
+ 64)
f
REF
f
VCO
= (32
B
2
+ A
2
+ 32)
f
REF
f
VCO
= (C + 1)
f
REF
TDA7326
6/16
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