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LM331 是美国NS 公司生产的性能价格比较高的集成芯片,可用作精密频率电压
转换器、A/D 转换器、线性频率调制解调、长时间积分器及其他相关器件。LM331
采用了新的温度补偿能隙基准电路,在整个工作温度范围内和低到4.0V 电源电压
下都有极高的精度。LM331 的动态范围宽,可达100dB;线性度好,最大非线性失
真小于0.01%,工作频率低到0.1Hz 时尚有较好的线性;变换精度高,数字分辨率
可达12 位;外接电路简单,只需接入几个外部元件就可方便构成V/F 或F/V 等变
换电路,并且容易保证转换精度。
Description
The LM231/LM331 family of voltage-to-frequency converters are ideally suited for use in simple low-cost circuits for analog-to-digital conversion, precision frequency-to-voltage conversion, long-term integration, linear frequency modulation or demodulation, and many other functions. The output when used as a voltage-to-frequency converter is a pulse train at a frequency precisely proportional to the applied input voltage. Thus, it provides all the inherent advantages of the voltage-to-frequency conversion techniques, and is easy to apply in all standard voltage-to-frequency converter applications. Further, the LM231A/LM331A attain a new high level of accuracy versus temperature which could only be attained with expensive voltage-to-frequency modules. Additionally the LM231/331 are ideally suited for use in digital systems at low power supply voltages and can provide low-cost analog-to-digital conversion in microprocessor-controlled systems. And, the frequency from a battery powered voltage-to-frequency converter can be easily channeled through a simple photo isolator to provide isolation against high common mode levels.
The LM231/LM331 utilize a new temperature-compensated band-gap reference circuit, to provide excellent accuracy over the full operating temperature range, at power supplies as low as 4.0V. The precision timer circuit has low bias currents without degrading the quick response necessary for 100 kHz voltage-to-frequency conversion. And the output are capable of driving 3 TTL loads, or a high voltage output up to 40V, yet is short-circuit-proof against VCC.
LM331N
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