ADC0809应用--电压表仿真+程序.zip_adc0809程序资源-CSDN文库

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电子设计

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智能控制

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ADC0809是一款经典的8位模拟数字转换器（Analog-to-Digital Converter），在单片机和嵌入式系统中广泛应用。这个压缩包“ADC0809应用--电压表仿真+程序.zip”显然是围绕ADC0809设计的一个实践项目，包括了电压表的仿真模型以及相关的程序代码。 ADC0809的主要功能是将输入的模拟电压转换成相应的数字值，通常用于读取传感器数据或者其他模拟信号。它有8个输入通道，可以选择其中一个进行转换。转换结果通过三线接口（Strobe、EOC和CLK）与微处理器通信，其中Strobe信号启动转换，EOC表示转换结束，CLK是时钟信号。在这个项目中，ADC0809被用于制作一个虚拟的电压表。电压表是测量电路中电压的工具，而这里的仿真可能是通过软件模拟ADC0809对电压的采集和转换过程，展示其工作原理和实际应用。仿真通常使用像Multisim或 Proteus 这样的电路设计和仿真软件进行，可以帮助开发者在没有硬件的情况下理解系统行为。程序部分可能包含两个主要部分：驱动ADC0809的C语言代码和处理转换结果的逻辑。驱动代码负责正确设置ADC0809的输入选择、启动转换，并在EOC信号上升沿时读取转换结果。处理逻辑则根据读取的数字值显示相应的电压，可能以图形界面或命令行方式呈现。在智能控制和电子设计领域，ADC0809的应用非常广泛，例如在环境监测系统、工业自动化设备、医疗仪器等。通过理解和实现这样的项目，开发者可以深入学习单片机接口技术、模拟信号处理以及数字信号处理的基础知识。论文源代码通常意味着这个项目可能与学术研究有关，可能包含了一些特定的算法或优化方法。因此，除了基本的ADC0809操作外，代码可能还涉及到了数据处理、误差校正或滤波等高级主题。总结来说，这个压缩包提供的资源可以帮助学习者掌握ADC0809的工作原理和编程技巧，了解如何在实际项目中使用它来构建电压测量系统。通过仿真和程序实践，可以加深对单片机、嵌入式系统以及模拟数字转换原理的理解，对于从事相关领域的学习和开发工作大有裨益。

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ADC0809应用--电压表仿真+程序.zip （43个子文件）

ADC0809应用--电压表仿真+程序

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ADC0808/ADC0809

8-Bit µP Compatible A/D Converters with 8-Channel

Multiplexer

General Description

The ADC0808, ADC0809 data acquisition component is a

monolithic CMOS device with an 8-bit analog-to-digital con-

verter, 8-channel multiplexer and microprocessor compatible

control logic. The 8-bit A/D converter uses successive ap-

proximation as the conversion technique. The converter fea-

tures a high impedance chopper stabilized comparator, a

256R voltage divider with analog switch tree and a succes-

sive approximation register. The 8-channel multiplexer can

directly access any of 8-single-ended analog signals.

The device eliminates the need for external zero and

full-scale adjustments. Easy interfacing to microprocessors

is provided by the latched and decoded multiplexer address

inputs and latched TTL TRI-STATE outputs.

The design of the ADC0808, ADC0809 has been optimized

by incorporating the most desirable aspects of several A/D

conversion techniques. The ADC0808, ADC0809 offers high

speed, high accuracy, minimal temperature dependence,

excellent long-term accuracy and repeatability, and con-

sumes minimal power. These features make this device

ideally suited to applications from process and machine

control to consumer and automotive applications. For

16-channel multiplexer with common output (sample/hold

port) see ADC0816 data sheet. (See AN-247 for more infor-

mation.)

Features

n Easy interface to all microprocessors

n Operates ratiometrically or with 5 V

or analog span

adjusted voltage reference

n No zero or full-scale adjust required

n 8-channel multiplexer with address logic

n 0V to 5V input range with single 5V power supply

n Outputs meet TTL voltage level specifications

n ADC0808 equivalent to MM74C949

n ADC0809 equivalent to MM74C949-1

Key Specifications

n Resolution 8 Bits

n Total Unadjusted Error

⁄

LSB and

1 LSB

n Single Supply 5 V

n Low Power 15 mW

n Conversion Time 100 µs

Block Diagram

00567201

See Ordering

Information

October 2002

ADC0808/ADC0809 8-Bit µP Compatible A/D Converters with 8-Channel Multiplexer

Connection Diagrams

Dual-In-Line Package

00567211

Order Number ADC0808CCN or ADC0809CCN

See NS Package J28A or N28A

Molded Chip Carrier Package

00567212

Order Number ADC0808CCV or ADC0809CCV

See NS Package V28A

Ordering Information

TEMPERATURE RANGE −40˚C to +85˚C

Error

⁄

LSB Unadjusted ADC0808CCN ADC0808CCV

1 LSB Unadjusted ADC0809CCN ADC0809CCV

Package Outline N28A Molded DIP V28A Molded Chip Carrier

ADC0808/ADC0809

www.national.com 2

Absolute Maximum Ratings (Notes 2,

If Military/Aerospace specified devices are required,

please contact the National Semiconductor Sales Office/

Distributors for availability and specifications.

Supply Voltage (V

) (Note 3) 6.5V

Voltage at Any Pin −0.3V to

+0.3V)

Except Control Inputs

Voltage at Control Inputs −0.3V to +15V

(START, OE, CLOCK, ALE, ADD A, ADD B, ADD C)

Storage Temperature Range −65˚C to +150˚C

Package Dissipation at T

=25˚C 875 mW

Lead Temp. (Soldering, 10 seconds)

Dual-In-Line Package (plastic)

260˚C

Molded Chip Carrier Package

Vapor Phase (60 seconds) 215˚C

Infrared (15 seconds) 220˚C

ESD Susceptibility (Note 8) 400V

Operating Conditions (Notes 1, 2)

Temperature Range (Note 1) T

MIN

≤T

MAX

ADC0808CCN,ADC0809CCN −40˚C≤T

≤+85˚C

ADC0808CCV, ADC0809CCV −40˚C≤T

≤+85˚C

Range of V

(Note 1) 4.5 V

to 6.0 V

Electrical Characteristics

Converter Specifications: V

=5 V

REF+

REF(−)

=GND, T

MIN

≤T

MAX

and f

CLK

=640 kHz unless otherwise stated.

Symbol Parameter Conditions Min Typ Max Units

ADC0808

Total Unadjusted Error 25˚C

⁄

LSB

(Note 5) T

MIN

to T

MAX

⁄

LSB

ADC0809

Total Unadjusted Error 0˚C to 70˚C

1 LSB

(Note 5) T

MIN

to T

MAX

⁄

LSB

Input Resistance From Ref(+) to Ref(−) 1.0 2.5 kΩ

Analog Input Voltage Range (Note 4) V(+) or V(−) GND−0.10 V

+0.10 V

REF(+)

Voltage, Top of Ladder Measured at Ref(+) V

+0.1 V

Voltage, Center of Ladder V

/2-0.1 V

/2 V

/2+0.1 V

REF(−)

Voltage, Bottom of Ladder Measured at Ref(−) −0.1 0 V

Comparator Input Current f

=640 kHz, (Note 6) −2

0.5 2 µA

Electrical Characteristics

Digital Levels and DC Specifications: ADC0808CCN, ADC0808CCV, ADC0809CCN and ADC0809CCV, 4.75≤V

≤5.25V,

−40˚C≤T

≤+85˚C unless otherwise noted

Symbol Parameter Conditions Min Typ Max Units

ANALOG MULTIPLEXER

OFF(+)

OFF Channel Leakage Current V

=5V, V

=5V,

=25˚C 10 200 nA

MIN

to T

MAX

1.0 µA

OFF(−)

OFF Channel Leakage Current V

=5V, V

=0,

=25˚C −200 −10 nA

MIN

to T

MAX

−1.0 µA

CONTROL INPUTS

IN(1)

Logical “1” Input Voltage V

−1.5 V

IN(0)

Logical “0” Input Voltage 1.5 V

IN(1)

Logical “1” Input Current V

=15V 1.0 µA

(The Control Inputs)

IN(0)

Logical “0” Input Current V

=0 −1.0 µA

(The Control Inputs)

Supply Current f

CLK

=640 kHz 0.3 3.0 mA

ADC0808/ADC0809

www.national.com3

Electrical Characteristics (Continued)

Digital Levels and DC Specifications: ADC0808CCN, ADC0808CCV, ADC0809CCN and ADC0809CCV, 4.75≤V

≤5.25V,

−40˚C≤T

≤+85˚C unless otherwise noted

Symbol Parameter Conditions Min Typ Max Units

DATA OUTPUTS AND EOC (INTERRUPT)

OUT(1)

Logical “1” Output Voltage V

= 4.75V

OUT

= −360µA

OUT

= −10µA

2.4

4.5

V(min)

OUT(0)

Logical “0” Output Voltage I

=1.6 mA 0.45 V

OUT(0)

Logical “0” Output Voltage EOC I

=1.2 mA 0.45 V

OUT

TRI-STATE Output Current V

=5V 3 µA

=0 −3 µA

Electrical Characteristics

Timing Specifications V

REF(+)

=5V, V

REF(−)

=GND, t

=20 ns and T

=25˚C unless otherwise noted.

Symbol Parameter Conditions MIn Typ Max Units

Minimum Start Pulse Width (Figure 5) 100 200 ns

WALE

Minimum ALE Pulse Width (Figure 5) 100 200 ns

Minimum Address Set-Up Time (Figure 5)2550ns

Minimum Address Hold Time (Figure 5)2550ns

Analog MUX Delay Time R

=0Ω (Figure 5) 1 2.5 µs

From ALE

OE Control to Q Logic State C

=50 pF, R

=10k (Figure 8) 125 250 ns

OE Control to Hi-Z C

=10 pF, R

=10k (Figure 8) 125 250 ns

Conversion Time f

=640 kHz, (Figure 5) (Note 7) 90 100 116 µs

Clock Frequency 10 640 1280 kHz

EOC

EOC Delay Time (Figure 5) 0 8+2 µS Clock

Periods

Input Capacitance At Control Inputs 10 15 pF

OUT

TRI-STATE Output At TRI-STATE Outputs 10 15 pF

Capacitance

Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. DC and AC electrical specifications do not apply when operating

the device beyond its specified operating conditions.

Note 2: All voltages are measured with respect to GND, unless othewise specified.

Note 3: A zener diode exists, internally, from V

to GND and has a typical breakdown voltage of 7 V

Note 4: Two on-chip diodes are tied to each analog input which will forward conduct for analog input voltages one diode drop below ground or one diode drop

greater than the V

n supply. The spec allows 100 mV forward bias of either diode. This means that as long as the analog V

does not exceed the supply voltage

by more than 100 mV, the output code will be correct. To achieve an absolute 0V

to 5V

input voltage range will therefore require a minimum supply voltage of

4.900 V

over temperature variations, initial tolerance and loading.

Note 5: Total unadjusted error includes offset, full-scale, linearity, and multiplexer errors. See Figure 3. None of these A/Ds requires a zero or full-scale adjust.

However, if an all zero code is desired for an analog input other than 0.0V, or if a narrow full-scale span exists (for example: 0.5V to 4.5V full-scale) the reference

voltages can be adjusted to achieve this. See Figure 13.

Note 6: Comparator input current is a bias current into or out of the chopper stabilized comparator. The bias current varies directly with clock frequency and has

little temperature dependence (Figure 6). See paragraph 4.0.

Note 7: The outputs of the data register are updated one clock cycle before the rising edge of EOC.

Note 8: Human body model, 100 pF discharged through a 1.5 kΩ resistor.

ADC0808/ADC0809

www.national.com 4

Functional Description

Multiplexer. The device contains an 8-channel single-ended

analog signal multiplexer. A particular input channel is se-

lected by using the address decoder. Table 1 shows the input

states for the address lines to select any channel. The

address is latched into the decoder on the low-to-high tran-

sition of the address latch enable signal.

TABLE 1.

SELECTED ADDRESS LINE

ANALOG CHANNEL C B A

IN0 L L L

IN1 L L H

IN2 L H L

IN3 L H H

IN4 H L L

IN5 H L H

IN6 H H L

IN7 H H H

CONVERTER CHARACTERISTICS

The Converter

The heart of this single chip data acquisition system is its

8-bit analog-to-digital converter. The converter is designed to

give fast, accurate, and repeatable conversions over a wide

range of temperatures. The converter is partitioned into 3

major sections: the 256R ladder network, the successive

approximation register, and the comparator. The converter’s

digital outputs are positive true.

The 256R ladder network approach (Figure 1) was chosen

over the conventional R/2R ladder because of its inherent

monotonicity, which guarantees no missing digital codes.

Monotonicity is particularly important in closed loop feedback

control systems. A non-monotonic relationship can cause

oscillations that will be catastrophic for the system. Addition-

ally, the 256R network does not cause load variations on the

reference voltage.

The bottom resistor and the top resistor of the ladder net-

work in Figure 1 are not the same value as the remainder of

the network. The difference in these resistors causes the

output characteristic to be symmetrical with the zero and

full-scale points of the transfer curve. The first output transi-

tion occurs when the analog signal has reached +

⁄

LSB

and succeeding output transitions occur every 1 LSB later up

to full-scale.

The successive approximation register (SAR) performs 8

iterations to approximate the input voltage. For any SAR

type converter, n-iterations are required for an n-bit con-

verter. Figure 2 shows a typical example of a 3-bit converter.

In the ADC0808, ADC0809, the approximation technique is

extended to 8 bits using the 256R network.

The A/D converter’s successive approximation register

(SAR) is reset on the positive edge of the start conversion

start pulse. The conversion is begun on the falling edge of

the start conversion pulse. A conversion in process will be

interrupted by receipt of a new start conversion pulse. Con-

tinuous conversion may be accomplished by tying the

end-of-conversion (EOC) output to the SC input. If used in

this mode, an external start conversion pulse should be

applied after power up. End-of-conversion will go low be-

tween 0 and 8 clock pulses after the rising edge of start

conversion.

The most important section of the A/D converter is the

comparator. It is this section which is responsible for the

ultimate accuracy of the entire converter. It is also the com-

parator drift which has the greatest influence on the repeat-

ability of the device. A chopper-stabilized comparator pro-

vides the most effective method of satisfying all the

converter requirements.

The chopper-stabilized comparator converts the DC input

signal into an AC signal. This signal is then fed through a

high gain AC amplifier and has the DC level restored. This

technique limits the drift component of the amplifier since the

drift is a DC component which is not passed by the AC

amplifier. This makes the entire A/D converter extremely

insensitive to temperature, long term drift and input offset

errors.

Figure 4 shows a typical error curve for the ADC0808 as

measured using the procedures outlined in AN-179.

ADC0808/ADC0809

www.national.com5

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