Datasheet > PIC16LC74-04I/L

PIC16LC74-04I/L

更新时间： 2024-10-05 20:32:27

品牌	Logo	应用领域
美国微芯 - MICROCHIP		可编程只读存储器时钟微控制器外围集成电路
页数	文件大小	规格书
34页	183K
描述
8-BIT, MROM, 4 MHz, RISC MICROCONTROLLER, PQCC44, PLASTIC, LCC-44

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PIC16LC74-04I/L 技术参数

是否无铅：	不含铅	是否Rohs认证：	符合
生命周期：	Active	零件包装代码：	LCC
包装说明：	QCCJ, LDCC44,.7SQ	针数：	44
Reach Compliance Code：	compliant	HTS代码：	8542.31.00.01
风险等级：	5.11	具有ADC：	YES
地址总线宽度：		位大小：	8
CPU系列：	PIC	最大时钟频率：	4 MHz
DAC 通道：	NO	DMA 通道：	NO
外部数据总线宽度：		JESD-30 代码：	S-PQCC-J44
JESD-609代码：	e3	长度：	16.5862 mm
湿度敏感等级：	1	I/O 线路数量：	33
端子数量：	44	片上程序ROM宽度：	14
最高工作温度：	85 °C	最低工作温度：	-40 °C
PWM 通道：	YES	封装主体材料：	PLASTIC/EPOXY
封装代码：	QCCJ	封装等效代码：	LDCC44,.7SQ
封装形状：	SQUARE	封装形式：	CHIP CARRIER
峰值回流温度（摄氏度）：	245	电源：	3.3/5 V
认证状态：	Not Qualified	RAM（字节）：	192
ROM（单词）：	4096	ROM可编程性：	OTPROM
座面最大高度：	4.572 mm	速度：	4 MHz
子类别：	Microcontrollers	最大压摆率：	3.8 mA
最大供电电压：	6 V	最小供电电压：	3 V
标称供电电压：	5 V	表面贴装：	YES
技术：	CMOS	温度等级：	INDUSTRIAL
端子面层：	Matte Tin (Sn)	端子形式：	J BEND
端子节距：	1.27 mm	端子位置：	QUAD
处于峰值回流温度下的最长时间：	40	宽度：	16.5862 mm
uPs/uCs/外围集成电路类型：	MICROCONTROLLER, RISC	Base Number Matches：	1

PIC16LC74-04I/L 数据手册

AN616

Digital Signal Processing with the PIC16C74

The input signal, x(t), is ﬁrst passed through an input

ﬁlter (commonly called the anti-aliasing ﬁlter) whose

function is to bandlimit the signal to below the Nyquist

rate (one half the sampling frequency) to prevent

aliasing. The signal is then digitized by the A/D

converter at a rate determined by the sample clock to

produce x(n), the discrete-time input sequence. The

system transfer function, H(z), is typically implemented

in the time-domain using a difference equation. The

output sample, y(n), is then converted back into the

continuous-time signal, y(t), by the D/A converter and

output low-pass ﬁlter.

Author:

Darius Mostowﬁ

Design Consultant

INTRODUCTION

This application note describes the basic issues that

need to be addressed in order to implement digital sig-

nal processing systems using the PIC16C74 and

provides application code modules and examples for

DTMF tone generation, a 60 Hz notch ﬁlter, and a

simple PID compensator for control systems. These

routines can also be used with other PIC16C6X and

PIC16C7XXX processors with minor modiﬁcations and

the addition of external analog I/O devices.

The calculation of the output signal using a difference

equation requires a multiply and accumulate (MAC)

operation. This is typically a single-cycle instruction on

DSP chips but can take many cycles to perform on a

standard microcontroller since it must be implemented

in code. Since the digitization of the signal, calculation

of the output, and output to the D/A converter all must

be completed within the sample clock period, the speed

at which this can be done determines the maximum

bandwidth that can be achieved with the system. The

relatively slow speed of most microcontrollers is the

major limitation when they are used in DSP applica-

tions but the PIC16C74’s fast instruction execution

speed (as fast as 200 ns/instruction) can provide the

performance required to implement relatively low band-

width systems. In addition, the device’s on-chip A/D and

PWM modules provide all the functions needed for a

single chip system. Only a few external components

are needed to use the PIC16C74 for tone generation,

ﬁltering of transducer signals, or low bandwidth control.

The use of general purpose microcontrollers for

low-end digital signal processing applications has

become more commonplace these days with the avail-

ability of higher speed processors. Since most signal

processing systems consist of a host processor and

dedicated DSP chip, the use of a single microcontroller

to perform both these functions provides a simpler and

lower cost solution. In addition, the single chip design

will consume less power which is ideal for battery

powered applications. The PIC16C74 with its on-chip

A/D, PWM module, and fast CPU is an ideal candidate

for use in these low-bandwidth signal processing

applications.

A typical signal processing system includes an A/D

converter, D/A converter, and CPU that performs the

signal processing algorithm as shown in Figure 1.

FIGURE 1: TYPICAL SIGNAL PROCESSING SYSTEM

X[n]

Y[n]

Low-pass

Filter

Low-pass

Filter

Y[t]

X[t]

A/D

H[z]

D/A

System Clock

1997 Microchip Technology Inc.

DS00616A-page 1

12 3 4 5 6 7...34

中文翻译

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与PIC16LC74-04I/L相关器件

型号	品牌	获取价格	描述	数据表
PIC16LC74-04I/P	ETC	获取价格	MICROCONTROLLER\|8-BIT\|PIC CPU\|CMOS\|DIP\|40PIN\|PLASTIC
PIC16LC74-04I/PQ	MICROCHIP	获取价格	8-BIT, MROM, 4 MHz, RISC MICROCONTROLLER, PQFP44, 10 X 10 MM, PLASTIC, MQFP-44
PIC16LC74-04JW	MICROCHIP	获取价格	8-BIT, UVPROM, 4 MHz, RISC MICROCONTROLLER, CDIP40, 0.600 INCH, WINDOWED, CERDIP-40
PIC16LC74-04T/PQ	ETC	获取价格	8-Bit Microcontroller
PIC16LC74A-04/JW	ETC	获取价格	MICROCONTROLLER\|8-BIT\|PIC CPU\|CMOS\|DIP\|40PIN\|CERAMIC
PIC16LC74A-04/L	ETC	获取价格	MICROCONTROLLER\|8-BIT\|PIC CPU\|CMOS\|LDCC\|44PIN\|PLASTIC
PIC16LC74A-04/P	ETC	获取价格	8-Bit Microcontroller
PIC16LC74A-04/PQ	ETC	获取价格	MICROCONTROLLER\|8-BIT\|PIC CPU\|CMOS\|QFP\|44PIN\|PLASTIC
PIC16LC74A-04/TQ	MICROCHIP	获取价格	8-BIT, MROM, 4 MHz, RISC MICROCONTROLLER, PQFP44, 10 X 10 MM, 1 MM HEIGHT, PLASTIC, MS-026
PIC16LC74A-04E/JW	ETC	获取价格	MICROCONTROLLER\|8-BIT\|PIC CPU\|CMOS\|DIP\|40PIN\|CERAMIC

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