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ADC0832是一款8位、单通道模拟数字转换器（ADC），在许多电子设计中都有广泛应用，特别是在需要将模拟信号转化为数字信号的系统中。这个"ADC0832开发板程序.zip_adc0832"压缩包显然是为了帮助用户理解和实践ADC0832的使用方法，通过具体的开发板测试程序来深入学习。 ADC0832的主要功能是将输入的模拟电压转换为相应的8位二进制数字。它有一个单一的输入通道，这意味着一次只能处理一个模拟信号。转换过程由转换启动引脚（START）触发，然后经过一定的时间延迟后，转换结果会通过数据输出引脚（DOUT）提供。转换速率通常在几微妙到几十微妙之间，具体取决于外部时钟源的频率。在ADC0832的开发过程中，通常需要以下几个关键步骤： 1. **硬件连接**：将ADC0832与微控制器（如Arduino、AVR或STM32）连接，确保电源、时钟、启动和中断引脚正确连接。还需要设置适当的参考电压（VREF），这将决定输入模拟电压的范围。 2. **配置时钟**：根据设计需求配置外部时钟源，时钟频率决定了ADC的转换速率。较高的时钟频率意味着更快的转换速度，但可能会牺牲精度。 3. **编程**：编写微控制器的固件来控制ADC0832。这包括启动转换、读取转换结果、处理中断等操作。压缩包中的"开发板程序"应该包含了这些功能的实现代码。 4. **测试与调试**：通过连接模拟信号源，观察转换结果，验证ADC0832的性能和准确度。开发板程序应该包含了一系列的测试用例，用于检查不同输入电压下的转换效果。 5. **应用集成**：在实际项目中，ADC0832常用于温度传感器、音频信号处理、电机控制等各种场景。理解并熟练使用ADC0832的开发板程序能帮助开发者更好地将ADC0832集成到自己的系统中。这个压缩包的使用者可以从程序中学习如何初始化ADC0832，如何触发转换，以及如何读取和解析转换结果。此外，可能还包含了错误处理和中断服务例程，这些都是实时系统中不可或缺的部分。通过深入研究并实践这个程序，开发者可以掌握ADC0832的关键操作，并且能够灵活地将其应用于各种实际工程中。

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ADC0832开发板程序.zip （21个子文件）

开发板程序

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chengxu.__i 37B

chengxu.lnp 62B

chengxu_Opt.Bak 1KB

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chengxu 5KB

chengxu.LST 5KB

STARTUP.LST 11KB

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chengxu.c 3KB

STARTUP.OBJ 750B

chengxu.hex 2KB

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ourhc.PWI 768B

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ADC0809.pdf 317KB

Last Loaded ourhc.DBK 182KB

ADC0809中文资料.txt 2KB

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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