參數(shù)資料
型號(hào)： TDA7421N
廠商： STMICROELECTRONICS
元件分類： 接收器
英文描述： AM/FM, AUDIO SINGLE CHIP RECEIVER, PQFP64
封裝： TQFP-64
文件頁(yè)數(shù)： 16/47頁(yè)
文件大?。?/td> 374K
代理商： TDA7421N
TDA7421N
Function description
A sample timer to generate the gate signal for the main counter is built with a 14 bit
programmable counter to have the possibility to use any frequency. In FM mode a 6.25 KHz,
in AM mode a 1KHz signal is generated. This counter is followed by an asynchronous
divider to generate several sampling times.
4.7
Intermediate frequency main counter (IFMC)
This counter is a 13-21 bit synchronous autoreload down-counter. Four bits are
programmable to have the possibility for an adjust to the frequency of the IF filter.The
counter length is automatically adjusted to the chosen sampling time and the counter mode.
At the start the counter will be loaded with a defined value which is an equivalent to the
divider value (tsample fIF).If a correct frequency is applied to the IF counter frequency
inputs IF-AM and IF-FM, at the end of the sampling time the main counter is changing its
state from 0 to 1FFFFFH.This is detected by a control logic. The frequency range inside
which a successful count results is detected is adjustable setting bits EW 0, 1, 2.
4.8
Up-down counter filter
The information coming from the IF main counter control logic is shifted into a 5 bit up down
counter circuit clocked by the sampling time signal. At the start (rising edge of the IFENA
signal) the counter is set to 10H and the SSTOP signal is forced to "1".Only when the
counter reaches the value 10H - step, SSTOP goes to "0".SSTOP will be "1" again, if the
counter reaches the value 10h + step.
Table 11.
Address organization (PLL and IF counter)
Function
Subadd
MSB
LSB
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
PLL CHARGE PUMP
00H
LPIN1/2 CURRH
B1
B0
A3
A2
A1
A0
LL COUNTER
01H
PC7
PC6
PC5
PC4
PC3
PC2
PC1
PC0
PLL COUNTER
02H
PC15
PC14
PC13
PC12
PC11
PC10
PC9
PC8
LL REF COUNTER
03H
RC7
RC6
RC5
RC4
RC3
RC2
RC1
RC0
LL REF COUNTER
04H
RC15
RC14
RC13
RC12
RC11
RC10
RC9
RC8
LL LOCK DETECT
05H
LDENA
-
D3
D2
D1
D0
PM1
PM0
FC REF COUNTER
06H
IRC7
IRC6
IRC5
IRC4
IRC3
IRC2
IRC1
IRC0
FC REF COUNTER
07H
IFCM1
IFCM0
IRC13
IRC12
IRC11
IRC10
IRC9
IRC8
FC CONTROL
08H
IFENA
----
EW2
EW1
EW0
C CONTROL
09H
IFS2
IFS1
IFS0
CF4
CF3
CF2
CF1
CF0
相關(guān)PDF資料
PDF描述
TDA7421 AUDIO SINGLE CHIP RECEIVER, PQFP64
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