LMC567CN

更新时间： 2024-02-15 01:05:23

品牌	Logo	应用领域
美国国家半导体 - NSC		解码器电信集成电路电信信令电路电信电路光电二极管
页数	文件大小	规格书
7页	172K
描述
Low Power Tone Decoder

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技术参数
数据手册

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LMC567CN 技术参数

是否Rohs认证：	不符合	生命周期：	Obsolete
包装说明：	SOP, SOP8,.25	Reach Compliance Code：	unknown
风险等级：	5.92	JESD-30 代码：	R-PDSO-G8
JESD-609代码：	e0	端子数量：	8
最高工作温度：	125 °C	最低工作温度：	-25 °C
封装主体材料：	PLASTIC/EPOXY	封装代码：	SOP
封装等效代码：	SOP8,.25	封装形状：	RECTANGULAR
封装形式：	SMALL OUTLINE	认证状态：	Not Qualified
子类别：	PLL or Frequency Synthesis Circuits	表面贴装：	YES
技术：	CMOS	温度等级：	OTHER
端子面层：	Tin/Lead (Sn/Pb)	端子形式：	GULL WING
端子节距：	1.27 mm	端子位置：	DUAL
Base Number Matches：	1

LMC567CN 数据手册

Typical Performance Characteristics

Supply Current vs.

Operating Frequency

Bandwidth vs.

Input Signal Level

Largest Detection

Bandwidth vs. Temp.

DS008670-3

DS008670-7

DS008670-8

Bandwidth as

a Function of C2

Frequency Drift

with Temperature

Frequency Drift

with Temperature

DS008670-10

DS008670-9

DS008670-11

Applications Information ^{(refer to Block}

Diagram)

This equation is accurate at low frequencies; however,

GENERAL

above 50 kHz (F_osc100 kHz), internal delays cause the

The LMC567 low power tone decoder can be operated at

supply voltages of 2V to 9V and at input frequencies ranging

from 1 Hz up to 500 kHz.

actual frequency to be lower than predicted.

The choice of Rt and Ct will be a tradeoff between supply

current and practical capacitor values. An additional supply

current component is introduced due to Rt being switched to

V_severy half cycle to charge Ct:

The LMC567 can be directly substituted in most LM567 ap-

plications with the following provisions:

1. Oscillator timing capacitor Ct must be halved to double

the oscillator frequency relative to the input frequency

(See OSCILLATOR TIMING COMPONENTS).

I_sdue to Rt V_s/(4Rt)

Thus the supply current can be minimized by keeping Rt as

large as possible (see supply current vs. operating fre-

quency curves). However, the desired frequency will dictate

an RtCt product such that increasing Rt will require a smaller

2. Filter capacitors C1 and C2 must be reduced by a factor

of 8 to maintain the same filter time constants.

3. The output current demanded of pin 8 must be limited to

the specified capability of the LMC567.

Ct. Below Ct 100 pF, circuit board stray capacitances be-

gin to play a role in determining the oscillation frequency

which ultimately limits the minimum Ct.

OSCILLATOR TIMING COMPONENTS

To allow for I.C. and component value tolerances, the oscil-

lator timing components will require a trim. This is generally

accomplished by using a variable resistor as part of Rt, al-

though Ct could also be padded. The amount of initial fre-

quency variation due to the LMC567 itself is given in the

electrical specifications; the total trim range must also ac-

commodate the tolerances of Rt and Ct.

The voltage-controlled oscillator (VCO) on the LMC567 must

be set up to run at twice the frequency of the input signal

tone to be decoded. The center frequency of the VCO is set

by timing resistor Rt and timing capacitor Ct connected to

pins 5 and 6 of the IC. The center frequency as a function of

Rt and Ct is given by:

Since this will cause an input tone of half F_oscto be decoded,

www.national.com

1 2 345 6 7

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与LMC567CN相关器件

型号	品牌	描述	获取价格	数据表
LMC567CN/NOPB	NSC	IC TELECOM, TONE DECODER CIRCUIT, PDIP8, PLASTIC, DIP-8, Telecom Signaling Circuit	获取价格
LMC567CN/NOPB	TI	Low-Power Tone Decoder	获取价格
LMC568	NSC	Low Power Phase-Locked Loop	获取价格
LMC568CM	NSC	Low Power Phase-Locked Loop	获取价格
LMC568CMX	ETC	Analog Phase-Locked Loop	获取价格
LMC568CMX/NOPB	NSC	IC PHASE LOCKED LOOP, PDSO8, M08A, PLL or Frequency Synthesis Circuit	获取价格

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