ADC08032：8位高速串行I/O A/D转换器详解

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"ADC08032是一款8位高速串行输入/输出模数转换器，具有可配置的多路复用器、电压参考和跟踪/保持功能。它适用于汽车传感器数字化、过程控制等应用。" ADC08032芯片是National Semiconductor公司推出的一款8位高精度、高速度的串行模数转换器（ADC），它提供了串行I/O接口，设计符合NSC MICROWIRE™串行数据交换标准，能够方便地与COPS™系列控制器连接，并且可以轻松与标准移位寄存器或微处理器接口配合使用。该系列芯片包括ADC08031、ADC08032、ADC08034和ADC08038，其中ADC08034和ADC08038提供了一个基于2.6V带隙基准的参考电压。 ADC08032的核心特性在于其逐次逼近转换技术，这使得它能在短时间内完成高精度的模拟到数字的转换。芯片内置的输入多路复用器最多可配置8个通道，可以根据需求选择单端、差分或伪差分模式，这种灵活性使其在各种应用场景中都能表现出色。此外，输入电压范围可以小至1V，这在处理低电压信号时非常有用。跟踪/保持功能是ADC08032的另一个重要特点。在实际的A/D转换过程中，该功能允许正输入端的模拟电压在转换期间变化，这有助于捕捉快速变化的信号。这对于需要实时监测和处理快速变化模拟信号的系统至关重要。在应用方面，ADC08032特别适合于数字化汽车传感器，如发动机管理系统、刹车系统中的各种传感器，可以将模拟信号转化为数字信号，便于微处理器进行处理和分析。另外，它也在过程控制领域中有广泛的应用，例如工业自动化设备、温度控制、压力监测等，通过将模拟信号转换成数字信号，可以提高系统精度和可靠性。总结来说，ADC08032是一款高性能、高灵活性的8位ADC，其串行I/O设计、多路复用器、跟踪/保持功能以及宽泛的输入电压范围使其在各种需要高精度快速转换的场合表现出色，尤其是在汽车电子和工业自动化领域。选择ADC08032意味着能够在设计中实现高效的数据采集和处理，同时保证系统的稳定性和准确性。

Electrical Characteristics (Continued)

vices, T

JMAX

= 125˚C. The typical thermal resistances (θ

) of these parts when board mounted follow: ADC08031 and ADC08032 with BIN and CIN suffixes

120˚C/W, ADC08038 with CIN suffix 80˚C/W. ADC08031 with CIWM suffix 140˚C/W, ADC08032 140˚C/W, ADC08034 140˚C/W, ADC08038 with CIWM suffix 91˚C/W.

Note 6: Human body model, 100 pF capacitor discharged through a 1.5 kΩ resistor.

Note 7: See AN450 “Surface Mounting Methods and Their Effect on Product Reliability” or Linear Data Book section “Surface Mount” for other methods of soldering

surface mount devices.

Note 8: Typicals are at T

= 25˚C and represent the most likely parametric norm.

Note 9: Guaranteed to National’s AOQL (Average Outgoing Quality Level).

Note 10: Total unadjusted error includes offset, full-scale, linearity, multiplexer.

Note 11: Cannot be tested for the ADC08032.

Note 12: For V

IN(−)

≥ V

IN(+)

the digital code will be 0000 0000. Two on-chip diodes are tied to each analog input (see Block Diagram) which will forward-conduct for

analog input voltages one diode drop below ground or one diode drop greater than V

supply. During testing at low V

levels (e.g., 4.5V), high level analog inputs

(e.g., 5V) can cause an input diode to conduct, especially at elevated temperatures, which will cause errors for analog inputs near full-scale. The spec allows 50 mV

forward bias of either diode; this means that as long as the analog V

does not exceed the supply voltage by more than 50 mV, the output code will be correct. Ex-

ceeding this range on an unselected channel will corrupt the reading of a selected channel. Achievement of an absolute 0 V

to5V

input voltage range will there-

fore require a minimum supply voltage of 4.950 V

over temperature variations, initial tolerance and loading.

Note 13: Channel leakage current is measured after a single-ended channel is selected and the clock is turned off. For off channel leakage current the following two

cases are considered: one, with the selected channel tied high (5 V

) and the remaining seven off channels tied low (0 V

), total current flow through the off chan-

nels is measured; two, with the selected channel tied low and the off channels tied high, total current flow through the off channels is again measured. The two cases

considered for determining on channel leakage current are the same except total current flow through the selected channel is measured.

Note 14: A 40% to 60% duty cycle range insures proper operation at all clock frequencies. In the case that an available clock has a duty cycle outside of these limits

the minimum time the clock is high or low must be at least 450 ns. The maximum time the clock can be high or low is 100 µs.

Note 15: Since data, MSB first, is the output of the comparator used in the successive approximation loop, an additional delay is built in (see Block Diagram) to allow

for comparator response time.

Note 16: For the ADC08032 V

REF

IN is internally tied to V

, therefore, for the ADC08032 reference current is included in the supply current.

Typical Performance Characteristics

Linearity Error vs

Reference Voltage

DS010555-32

Linearity Error vs

Temperature

DS010555-33

Linearity Error vs

Clock Frequency

DS010555-34

Power Supply Current vs

Temperature (ADC08038,

ADC08034, ADC08031)

DS010555-35

Note: For ADC08032 add I

REF

Output Current vs

Temperature

DS010555-36

Power Supply Current

vs Clock Frequency

DS010555-37

ADC08031/ADC08032/ADC08034/ADC08038

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ADC08032：8位高速串行I/O A/D转换器详解

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