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參數(shù)資料
| 型號(hào)： | TDA7421 |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | AM/FM TUNER FOR CAR RADIO AND Hi-Fi APPLICATIONS |
| 中文描述： | AM / FM調(diào)諧的汽車收音機(jī)及音響應(yīng)用 |
| 文件頁(yè)數(shù)： | 17/38頁(yè) |
| 文件大小： | 527K |
| 代理商： | TDA7421 |
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t
tim
= (IFRC + 1) / f
osc
t
cnt
= (CF + 1697) / f
IF
FM mode
t
cnt
= (CF + 44) / f
IF
AM mode
Counter result succeeded:
t
tim
> t
cnt
- t
err
and
t
tim
> t
cnt
+ t
err
Counter result failed:
t
tim
< t
cnt
+ t
err
or
t
tim
> t
cnt
- t
err
where:
t
tim
= IF time cycle time
t
cnt
= IF counter cycle time
t
err
= discrimination window (controlled by the EW
registers)
The precision of the measurements is adjustable
by controlling the discrimination window. This is
adjustable by programming the control registers
EW0...EW2.
The measurement time per cycle is adjustable by
setting the register IFS0 - IFS2.
The center frequency of the discrimination win-
dow is adjustable by the control register "CF0" to
"CF4". The available values are reported in dat-
abyte specification
I
2
C BUS INTERFACE
General Description
The TDA7421 supports the I
2
C bus protocol. This
protocol defines the devices sending data into the
bus as transmitter and the receiving device as the
receiver.
The device that controls the transfer is a master
and the device being controlled is the slave. The
master will always initiates data transfer and pro-
vide the clock to transmit or receive operations.
Data Transition
Data transition on the SDA line must only occur
when the clock SCL is low. SDA transitions while
SCL is high will be interpreted as START or
STOP condition.
Start Condition
Phase Comparator
t
tim
t
cnt
-t
ERR
succeeded
t
cnt
+t
ERR
failed
failed
D96AU551
TDA7421
17/38
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TDA7421N | 制造商:ST 功能描述:AM/FM TUNER FOR CAR RADIO AND HI-FI APPLICATIONS |
| TDA7427 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:AM-FM RADIO FREQUENCY SYNTHESIZER AND IF COUNTER |
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| TDA7427AAD | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:AM-FM RADIO FREQUENCY SYNTHESIZER AND IF COUNTER |
| TDA7427AAD1 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:AM-FM RADIO FREQUENCY SYNTHESIZER AND IF COUNTER |
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