SA624D-T

更新时间： 2024-01-09 20:14:30

品牌	Logo	应用领域
恩智浦 - NXP		/
页数	文件大小	规格书
15页	162K
描述
IC FM, AUDIO DEMODULATOR, PDSO16, Receiver IC

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技术参数
数据手册

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SA624D-T 技术参数

生命周期：	Obsolete	包装说明：	DIP,
Reach Compliance Code：	unknown	风险等级：	5.83
商用集成电路类型：	AUDIO DEMODULATOR	解调类型：	FM
JESD-30 代码：	R-PDIP-T16	长度：	19.025 mm
功能数量：	1	端子数量：	16
最高工作温度：	85 °C	最低工作温度：	-40 °C
标称输出电压（调频）：	530 mV	封装主体材料：	PLASTIC/EPOXY
封装代码：	DIP	封装形状：	RECTANGULAR
封装形式：	IN-LINE	认证状态：	Not Qualified
座面最大高度：	4.2 mm	信噪比Nom（FM）：	73 dB
最大压摆率：	4.2 mA	最大供电电压 (Vsup)：	8 V
最小供电电压 (Vsup)：	4.5 V	表面贴装：	NO
温度等级：	INDUSTRIAL	端子形式：	THROUGH-HOLE
端子节距：	2.54 mm	端子位置：	DUAL
宽度：	7.62 mm	Base Number Matches：	1

SA624D-T 数据手册

Philips Semiconductors

Product specification

High performance low power FM IF system with

high-speed RSSI

SA624

42k

V+

40k

BPF

40k

80k

SR00446

SR00447

Figure 8. Feedback Paths

Figure 7. Second Limiter and Quadrature Detector

HIGH IMPEDANCE

BPF

HIGH IMPEDANCE

BPF

LOW IMPEDANCE

a. Terminating High Impedance Filters with Transformation to Low Impedance

BPF

RESISTIVE LOSS INTO BPF

b. Low Impedance Termination and Gain Reduction

Figure 9. Practical Termination

SR00448

430

NE 624

430

SR00449

Figure 10. Crystal Input Filter with Ceramic Interstage Filter

forms a divider from the output of the limiters back to the inputs

(including RF input). If this feedback divider does not cause

attenuation greater than the gain of the forward path, then oscillation

or low level regeneration is likely. If regeneration occurs, two

symptoms may be present: (1)The RSSI output will be high with no

signal input (should nominally be 250mV or lower), and (2) the

demodulated output will demonstrate a threshold. Above a certain

input level, the limited signal will begin to dominate the regeneration,

and the demodulator will begin to operate in a “normal” manner.

There are three primary ways to deal with regeneration: (1)

Minimize the feedback by gain stage isolation, (2) lower the stage

input impedances, thus increasing the feedback attenuation factor,

and (3) reduce the gain. Gain reduction can effectively be

1997 Nov 07

1...5 6 789 10 11...15

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