Datasheet > 消费电路 > 信号分离器集成电路> LM1881N-X/NOPB

LM1881N-X/NOPB

更新时间： 2024-02-03 19:22:00

品牌	Logo	应用领域
德州仪器 - TI		/
页数	文件大小	规格书
18页	1117K
描述
SYNC SEPARATOR IC, PDIP8, PLASTIC, DIP-8

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LM1881N-X/NOPB 技术参数

是否无铅：	不含铅	是否Rohs认证：	符合
生命周期：	Obsolete	零件包装代码：	DIP
包装说明：	DIP, DIP8,.3	针数：	8
Reach Compliance Code：	compliant	风险等级：	5.66
商用集成电路类型：	SYNC SEPARATOR IC	JESD-30 代码：	R-PDIP-T8
JESD-609代码：	e3	长度：	9.817 mm
湿度敏感等级：	1	功能数量：	1
端子数量：	8	最高工作温度：	70 °C
最低工作温度：		封装主体材料：	PLASTIC/EPOXY
封装代码：	DIP	封装等效代码：	DIP8,.3
封装形状：	RECTANGULAR	封装形式：	IN-LINE
峰值回流温度（摄氏度）：	260	电源：	5/12 V
认证状态：	Not Qualified	座面最大高度：	5.08 mm
子类别：	Other Consumer ICs	最大压摆率：	12 mA
最大供电电压 (Vsup)：	12 V	最小供电电压 (Vsup)：	5 V
表面贴装：	NO	技术：	BIPOLAR
温度等级：	COMMERCIAL	端子面层：	Matte Tin (Sn)
端子形式：	THROUGH-HOLE	端子节距：	2.54 mm
端子位置：	DUAL	处于峰值回流温度下的最长时间：	40
宽度：	7.62 mm	Base Number Matches：	1

LM1881N-X/NOPB 数据手册

LM1881

www.ti.com

SNLS384F –FEBRUARY 1995–REVISED MARCH 2013

*Components Optional, See Text

Figure 9.

ODD/EVEN FIELD PULSE

An unusual feature of LM1881 is an output level from Pin 7 that identifies the video field present at the input to

the LM1881. This can be useful in frame memory storage applications or in extracting test signals that occur in

alternate fields. For a composite video signal that is interlaced, one of the two fields that make up each video

frame or picture must have a half horizontal scan line period at the end of the vertical scan—i.e., at the bottom of

the picture. This is called the “odd field” or “even field”. The “even field” or “field 2” has a complete horizontal

scan line at the end of the field. An odd field starts on the leading edge of the first equalizing pulse, whereas the

even field starts on the leading edge of the second equalizing pulse of the vertical retrace interval. Figure 8(a)

shows the end of the even field and the start of the odd field.

To detect the odd/even fields the LM1881 again integrates the composite sync waveform (Figure 9). A capacitor

is charged during the period between sync pulses and discharged when the sync pulse is present. The period

between normal horizontal sync pulses is enough to allow the capacitor voltage to reach a threshold level of a

comparator that clears a flip-flop which is also being clocked by the sync waveform. When the vertical interval is

reached, the shorter integration time between equalizing pulses prevents this threshold from being reached and

the Q output of the flip-flop is toggled with each equalizing pulse. Since the half line period at the end of the odd

field will have the same effect as an equalizing pulse period, the Q output will have a different polarity on

successive fields. Thus by comparing the Q polarity with the vertical output pulse, an odd/even field index is

generated. Pin 7 remains low during the even field and high during the odd field.

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与LM1881N-X/NOPB相关器件

型号	品牌	描述	获取价格	数据表
LM1881-X	NSC	LM1881 Video Sync Separator	获取价格
LM1882	NSC	Programmable Video Sync Generator	获取价格
LM1882CM	NSC	Programmable Video Sync Generator	获取价格
LM1882CMX	TI	SPECIALTY CONSUMER CIRCUIT, PDSO20, SOIC-20	获取价格
LM1882CN	NSC	Programmable Video Sync Generator	获取价格
LM1882E/883	TI	SPECIALTY CONSUMER CIRCUIT, CQCC20, CERAMIC, LCC-20	获取价格

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