音影先锋亚洲天堂网|电影世界尽头的爱完整版播放|国产 熟女 91|高清无码免费观看欧美日韩|韩国一区二区三区黄色录像|美女亚洲加勒比在线|亚洲综合网 开心五月|7x成人在线入口|成人网站免费日韩毛片区|国产黄片?一级?二级?三级

TDA7460ND Datasheet

  • TDA7460ND

  • CAR RADIO SIGNAL PROCESSOR

  • 31頁

  • STMICROELECTRONICS   STMICROELECTRONICS

掃碼查看芯片數(shù)據(jù)手冊(cè)

上傳產(chǎn)品規(guī)格書

PDF預(yù)覽

TDA7460N
Automatic Threshold Control
Besides the noise controlled threshold adjust-
ment there is an additional possibility for influenc-
ing the trigger threshold. It is depending on the
stereoblend control.
The point where the MPX signal starts to become
noisy is fixed by the RF part. Therefore also the
starting point of the normal noise-controlled trig-
ger adjustment is fixed (fig. 16). In some cases
the behaviour of the noiseblanker can be im-
proved by increasing the threshold even in a re-
gion of higher fieldstrength. Sometimes a wrong
triggering occures for the MPX signal often shows
distortion in this range which can be avoided
even if using a low threshold.
Because of the overlap of this range and the
range of the stereo/mono transition it can be con-
trolled by stereoblend. This threshold increase is
programmable in 3 steps or switched off with bits
D0 and D1 of the fieldstrength control byte.
Over Deviation Detector
If the system is tuned to stations with a high de-
viation the noiseblanker can trigger on the higher
frequencies of the modulation. To avoid this
wrong behaviour, which causes noise in the out-
put signal, the noiseblanker offers a deviation de-
pendent threshold adjustment.
By rectifying the MPX signal a further signal rep-
resenting the actual deviation is obtained. It is
Figure 23. Block diagram of the Multipath Detector
used to increase the PEAK voltage. Offset and
gain of this circuit are programmable in 3 steps
with the bits D6 and D7 of the stereodecoder byte
(the first step turns off the detector, see fig. 15).
FUNCTIONAL DESCRIPTION OF THE MULTI-
PATH DETECTOR
Using the internal detector the audible effects of a
multipath condition can be minimized. A multipath
condition is detected by rectifying the 19kHz
spectrum in the fieldstrength signal.
Selecting the 鈥漣nternal influence鈥?in the configura-
tion byte, the channel separation is automatically
reduced during a multipath condition according to
the voltage appearing at the MPOUT pin.
To obtain a optimal performance an adaptation is
necessary. Therefore the gain of the 19kHz band-
pass is programmable in four steps as well as the
rectifier gain. The attack and decay times can be
set by the external capacitor value.
TEST MODE
During the test mode which can be activated by
setting bit D0 of the testing byte and bit D5 of the
subaddress byte to 鈥?鈥?several internal signals
are available at the CASSR pin. During this
mode the input resistance of 100kOhm is discon-
nected from the pin. The internal signals available
are shown in the software specification.
LEVEL
VDD
-
to SB
int. INFLUENCE
DC=1碌
MP ENABLE
BANDPASS
19KHz
15K
GAIN
2 BITS
GAIN
2 BITS
TO PHONE_GND - APR
RECTIFIER
MPIN
MPOUT
220nF
D98AU862
20/31

TDA7460ND 產(chǎn)品屬性

  • 40

  • 集成電路 (IC)

  • 線性 - 音頻處理

  • -

  • 汽車信號(hào)處理器

  • 車載系統(tǒng)

  • 表面貼裝

  • 20-SOIC（0.295"，7.50mm 寬）

  • 20-SO

  • 管件

TDA7460ND相關(guān)型號(hào)PDF文件下載

您可能感興趣的PDF文件資料

熱門IC型號(hào)推薦

掃碼下載APP，
一鍵連接廣大的電子世界。

在線人工客服

買家服務(wù)：
賣家服務(wù)：
技術(shù)客服：

0571-85317607

網(wǎng)站技術(shù)支持

13606545031

客服在線時(shí)間周一至周五
9:00-17:30

關(guān)注官方微信號(hào)，
第一時(shí)間獲取資訊。

建議反饋
返回頂部

建議反饋

聯(lián)系人：

聯(lián)系方式：

按住滑塊，拖拽到最右邊
>>
感謝您向阿庫提出的寶貴意見，您的參與是維庫提升服務(wù)的動(dòng)力！意見一經(jīng)采納，將有感恩紅包奉上哦！