TDA9830

更新时间： 2024-01-13 09:35:35

品牌	Logo	应用领域
恩智浦 - NXP		电视光电二极管
页数	文件大小	规格书
15页	141K
描述
TV sound AM-demodulator and audio source switch

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技术参数
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TDA9830 技术参数

是否Rohs认证：	符合	生命周期：	Obsolete
Reach Compliance Code：	unknown	ECCN代码：	EAR99
HTS代码：	8542.39.00.01	风险等级：	5.64
商用集成电路类型：	AUDIO DEMODULATOR	解调类型：	AM
谐波失真：	0.8%	JESD-30 代码：	R-PDSO-G16
长度：	9.9 mm	功能数量：	1
端子数量：	16	最高工作温度：	70 °C
最低工作温度：		输出电压标称（AM）：	500 mV
封装主体材料：	PLASTIC/EPOXY	封装代码：	SOP
封装形状：	RECTANGULAR	封装形式：	SMALL OUTLINE
峰值回流温度（摄氏度）：	260	认证状态：	Not Qualified
座面最大高度：	1.75 mm	最大压摆率：	36 mA
最大供电电压 (Vsup)：	8.8 V	最小供电电压 (Vsup)：	4.5 V
表面贴装：	YES	温度等级：	COMMERCIAL
端子形式：	GULL WING	端子节距：	1.27 mm
端子位置：	DUAL	处于峰值回流温度下的最长时间：	40
宽度：	3.9 mm	Base Number Matches：	1

TDA9830 数据手册

Philips Semiconductors

Product speciﬁcation

TV sound AM-demodulator and audio source switch

TDA9830

PINNING

SYMBOL

IFIN

DESCRIPTION

sound IF differential input signal

not connected

n.c.

C_AGC

C_REF

n.c.

AGC capacitor

REF voltage ﬁltering capacitor

not connected

AMOUT

AMIN

AFOUT

EXTIN

SWITCH

V_p2

AM demodulator output

input signal (from AM) to audio switch

output signal from audio switch

input signal (from external) to audio switch

switch input select control

supply voltage +12 V (alternative)

mute control

MUTE

GND

V_p1

ground (0 V)

supply voltage +5 to +8 V

not connected

n.c.

Fig.2 Pin configuration.

IFIN

sound IF differential input signal

maximumcharge/dischargecurrentis

approximately 5 µA. This value in

combination with the value of the

AGC capacitor and the AGC

steepness determines the lower

cut-off audio frequency and the

THD-figure at low modulation

demodulation (in phase

FUNCTIONAL DESCRIPTION

Sound IF input

demodulation). After lowpass filtering

(f_g≈ 400 kHz) for carrier rejection and

buffering, the demodulator output

signal is present at pin 6. The AM

demodulator operates over a wide

frequency range, so that in

combination with the frequency

response of the IF amplifier

applications in a frequency range

from approximately 6 MHz up to

70 MHz are possible.

The sound IF amplifier consists of

three AC-coupled differential

amplifier stages each with

approximately 20 dB gain. At the

output of each stage is a multiplier for

gain controlling (→ current

distribution gain control). The overall

control range is approximately −6 to

+60 dB and the frequency response

(−3 dB) of the IF amplifier is

approximately 6 to 70 MHz. The

steepness of gain control is

frequency of the whole

AM-demodulator. Therefore a large

time constant has to be chosen which

leads to slow AGC reaction at IF level

change. To speed up the AGC in case

of IF signal jump from low to high

level, there is an additional

comparator built in, which can provide

additional discharge current from the

AGC capacitor up to 5 mA in a case of

overloading the AM demodulator by

the internal IF signal.

Audio switch

This circuit is an operational amplifier

with three input stages and internal

feedback network determining gain

(0 dB) and frequency response

approximately 10 mV/dB.

IF AGC

(f_g≈ 700 kHz). Two of the input

stages are connected to pin 7 and pin

9, the third input stage to an internal

reference voltage. Controlled by the

switching pins 10 and 12, one of the

three input stages can be activated

and a choice made between two

different AF signals or mute state.

The selected signal is present at

The automatic gain control voltage to

maintain the AM demodulator output

signal at a constant level is generated

by a mean level detector. This

AM-demodulator

The IF amplifier output signal is fed to

a limiting amplifier (two stages) and to

a multiplier circuit. However the limiter

output signal (which is not any more

AM modulated) is also fed to the

multiplier, which provides AM

AGC-detector charges and

discharges the capacitor at pin 3

controlled by the output signal of the

AM-demodulator compared to an

internal reference voltage. The

June 1994

1 2 345 6 7...15

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