TDA8742H

更新时间： 2024-02-04 18:24:42

品牌	Logo	应用领域
恩智浦 - NXP		消费电路商用集成电路接收器集成电路
页数	文件大小	规格书
21页	284K
描述
Satellite sound circuit with noise reduction

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中文翻译

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技术参数
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TDA8742H 技术参数

生命周期：	Obsolete	包装说明：	QFP,
Reach Compliance Code：	unknown	风险等级：	5.7
商用集成电路类型：	AUDIO DEMODULATOR	解调类型：	FM
谐波失真：	0.1%	JESD-30 代码：	S-PQFP-G44
长度：	10 mm	功能数量：	1
端子数量：	44	最高工作温度：	70 °C
最低工作温度：	-20 °C	封装主体材料：	PLASTIC/EPOXY
封装代码：	QFP	封装形状：	SQUARE
封装形式：	FLATPACK	认证状态：	Not Qualified
座面最大高度：	2.1 mm	信噪比Nom（FM）：	70 dB
最大压摆率：	45 mA	最大供电电压 (Vsup)：	13.2 V
最小供电电压 (Vsup)：	8 V	表面贴装：	YES
温度等级：	COMMERCIAL	端子形式：	GULL WING
端子节距：	0.8 mm	端子位置：	QUAD
宽度：	10 mm	Base Number Matches：	1

TDA8742H 数据手册

Philips Semiconductors

Product speciﬁcation

Satellite sound circuit with noise reduction

TDA8742; TDA8742H

High frequency components in the amplified PLL output

signal are filtered out in the audio LPF block (4th order

Butterworth low-pass filter) to prevent unwanted influence

on the noise reduction.

ABBREVIATIONS

f_MOD= modulating frequency.

∆f_M= frequency deviation of the main Channel.

∆f_S1= frequency deviation of secondary Channel 1 (left).

∆f_S2= frequency deviation of secondary Channel 2 (right).

f_OM= carrier frequency of main Channel.

f_OS1= carrier frequency of secondary Channel 1.

f_OS2= carrier frequency of secondary Channel 2.

LPF = Low-Pass Filter.

NOISE REDUCTION (NR)

The noise reduction can be regarded as an input

level-dependent low-pass filter (adaptive de-emphasis

system) followed by a fixed de-emphasis. With maximum

input level (0 dB) the frequency response of the first part

(i.e. without the fixed de-emphasis) is virtually flat. As the

input level is lowered by x-dB, the higher output

frequencies will be reduced an extra x-dB with respect to

the lower frequencies (1 : 2 expansion).

NR = Noise Reduction.

The NR output signal is fed to pin 36 (32) (left) and pin 32

(28) (right) via an internal resistor.

PLL = Phase-Locked-Loop.

Fixed de-emphasis is achieved by these resistors and

external capacitors connected to ground. The signals are

DC decoupled via pins 36/35 (32/31) and 32/33 (28/29)

and then routed to the output selectors.

OUTPUT SELECTION

With the output selector (see Table 2) the outputs at

pins 25 and 24 (21 and 20) can be switched to the different

channels. Both outputs can be switched to both secondary

channels, to the main channel and to the external inputs at

pin 28 and 27 (24 and 23) for IC chaining purposes.

Pin 23 (19) is a separate output which delivers the main

channel only, thereby creating the possibility of having

three different output channels simultaneously e.g. for use

in hi-fi VCRs.

The outputs at pins 25 and 24 (21 and 20) can be muted

by setting the MUTE signal at pin 13 (8) to logic 1 (switch

positions 6 and 7).

The output at pin 23(19) can be muted by setting the

MUTE signal and the EXT/INT signal at pin 26 (22) both

logic 1 (switch position 7).

All outputs at pins 23, 24 and 25 (19, 20 and 21) are line

drivers with SCART level capability and are short-circuit

protected by 125 Ω output resistors.

Output level of all channels = −6 dBV typical when

frequency deviation of FM signal is 54% of maximum

frequency deviation (i.e. 0.54 × 85 kHz = 46 kHz for the

main channel and 0.54 × 50 kHz = 27 kHz for the

secondary channels) at 1 kHz modulation frequency

(reference level).

October 1994

1...5 6 789 10 11...21

中文翻译

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