TDA8740H-T

更新时间： 2024-02-19 13:22:58

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光电二极管
页数	文件大小	规格书
24页	326K
描述
IC FM, AUDIO DEMODULATOR, PQFP44, Receiver IC

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数据手册

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TDA8740H-T 技术参数

是否Rohs认证：	不符合	生命周期：	Obsolete
包装说明：	SDIP, SDIP42,.6	Reach Compliance Code：	unknown
风险等级：	5.92	JESD-30 代码：	R-PDIP-T42
JESD-609代码：	e0	端子数量：	42
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：	SDIP
封装等效代码：	SDIP42,.6	封装形状：	RECTANGULAR
封装形式：	IN-LINE, SHRINK PITCH	电源：	12 V
认证状态：	Not Qualified	子类别：	Other Consumer ICs
最大压摆率：	45 mA	表面贴装：	NO
技术：	BIPOLAR	温度等级：	COMMERCIAL
端子面层：	Tin/Lead (Sn/Pb)	端子形式：	THROUGH-HOLE
端子节距：	1.78 mm	端子位置：	DUAL
Base Number Matches：	1

TDA8740H-T 数据手册

Philips Semiconductors

Product speciﬁcation

Satellite sound circuit with noise reduction

TDA8740; TDA8740H

NOISE REDUCTION (NR)

ABBREVIATIONS

f_MOD= modulating frequency.

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).

∆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.

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

(28) (right) via internal resistors.

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.

NR = Noise Reduction.

PLL = Phase-Locked-Loop

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...24

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与TDA8740H-T相关器件

型号	品牌	描述	获取价格	数据表
TDA8740NB	ETC	TV/Video Sound Circuit	获取价格
TDA8741	NXP	Satellite sound circuit with noise reduction	获取价格
TDA8741H	NXP	Satellite sound circuit with noise reduction	获取价格
TDA8741HB-S	ETC	TV/Video Sound Circuit	获取价格
TDA8741H-T	NXP	IC FM, AUDIO DEMODULATOR, PQFP44, Receiver IC	获取价格
TDA8741NB	ETC	TV/Video Sound Circuit	获取价格

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