參數(shù)資料
型號(hào)： TDA7540B
廠商： 意法半導(dǎo)體
英文描述： AM/FM Car Radio Tuner IC with Stereo Decoder and Intelligent Selectivity System (ISS)
中文描述： 調(diào)幅/調(diào)頻收音機(jī)調(diào)諧器集成電路汽車與立體聲解碼器和智能識(shí)別系統(tǒng)（ISS）的
文件頁(yè)數(shù)： 34/75頁(yè)
文件大小： 1061K
代理商： TDA7540B
Functional description
TDA7540B
34/75
This is detected by a control logic and an external search stop output is changing from LOW
to HIGH. The frequency range inside which a successful count result is adjustable by the
EW bits.
t
CNT
= (CF + 1696+1) / f
IF
t
CNT
= (CF + 10688+1) / f
IF
AM up conversion mode
t
CNT
= (CF + 488+1) / f
IF
FM mode
AM mode
Counter result succeeded:
t
TIM
≥
t
CNT
- t
ERR
t
TIM
≤
t
CNT
+ t
ERR
Counter result failed:
t
TIM
> t
CNT
+ t
ERR
t
TIM
< t
CNT
- t
ERR
t
TIM
= IF timer cycle time (sampling time)
t
CNT
= IF counter cycle time
t
ERR
= discrimination window (controlled by the EW registers)
The IF counter is only started by inlock information from the PLL part. It is enabled by
software (IFENA).
Adjustment of the measurement sequence time
The precision of the measurements is adjustable by controlling the discrimination window.
This is adjustable by programming the control registers EW.
The measurement time per cycle is adjustable by setting the registers IFS.
Adjust of the Frequency Value
The center frequency of the discrimination window is adjustable by the control registers CF.
4.5
I
2
C-Bus interface
The TDA7540 supports the I
2
C-Bus protocol. This protocol defines any device that sends
data onto the bus as a transmitter, and the receiving device as the receiver. The device that
controls the transfer is a master and device being controlled is the slave. The master will
always initiate data transfer and provide the clock to transmit or receive operations.
4.5.1
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.
4.5.2
Start condition
A start condition is defined by a HIGH to LOW transition of the SDA line while SCL is at a
stable HIGH level. This "START" condition must precede any command and initiate a data
transfer onto the bus. The device continuously monitors the SDA and SCL lines for a valid
START and will not response to any command if this condition has not been met.
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TDA7540BTR 制造商:ST 功能描述:CAR RADIO FST TUNER
TDA7540N 功能描述:調(diào)諧器 AM/FM car radio Tuner IC Decoder RoHS:否 制造商:NXP Semiconductors 功能: 噪聲系數(shù): 工作電源電壓: 最小工作溫度: 最大工作溫度:
TDA7540NTR 功能描述:調(diào)諧器 AM/FM car radio Tuner IC Decoder RoHS:否 制造商:NXP Semiconductors 功能: 噪聲系數(shù): 工作電源電壓: 最小工作溫度: 最大工作溫度:
TDA7541 功能描述:音頻放大器 AM/FM car radio Tuner IC Decoder RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel
TDA7541B 功能描述:音頻放大器 AM/FM car radio Tuner IC Decoder RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel
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