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参数资料
| 型号： | TDA7421N |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 接收器 |
| 英文描述： | AM/FM, AUDIO SINGLE CHIP RECEIVER, PQFP64 |
| 封装： | TQFP-64 |
| 文件页数： | 14/47页 |
| 文件大小： | 374K |
| 代理商： | TDA7421N |
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TDA7421N
Function description
4
Function description
4.1
FM section
Featuring a single conversion configuration, it comprises a multi-stage IF limiter whose gain
is I2C controlled and a quadrature demodulator with detuning and adjacent channel
detectors. Signal meter and stop station functions are also supported
4.2
AM section
AM signal is converted by means of UP-DOWN configuration (IF1 = 10.7 MHz, IF2 =
450 kHz) and MW/LW bands are covered.
4.3
PLL section
Three operating modes are available:
They are user programmable with the mode PM registers.
4.4
Standby mode
It stops all functions. This allows low current consumption without loss of information in all
registers. The pin LP-OUT is forced to 0V in power on. All data registers are set to FE
(11111110). The oscillator does not run in stand-by mode.
4.5
FM and AM operation
The FM or AM signal applies to a 32/33 prescaler, which is controlled by a 5 bit counter (A).
The 5 bit register (PC0 to PC4) controls this divider.
The output of the prescaler connects to a 11 bit divider (B). The 11 bit register (PC5 to
PC15) controls the divider 'B'.
4.5.1
Three state phase comparator
The phase comparator generates a phase error signal according to phase difference
between fSYN and fREF. This phase error signal drives the charge pump current generator.
Table 8.
Operating modes
PM0
PM1
Operating mode
0
Standby
10
AM
0
1
not used
11
FM
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