Nisshinbo Releases NA2100 Low-Consumption Voltage to Frequency Converter for Industrial Equipment

PublishTime： 2024-07-12 Article Source：NISSHINBO Official Website

Nisshinbo Micro Devices Inc. released the NA2100, a general-purpose, low-consumption voltage to frequency converter for industrial equipment.

In the industrial market, sensing applications sometimes require signals to be transmitted over long distances. As signal quality deteriorates due to noise and other factors when analog signals are transmitted over long distances, the possibility of equipment malfunction increases. To solve this problem, the signals are converted to digital signals for transmission so that they are less susceptible to noise.

The NA2100 can easily convert analog signals to digital frequency proportional to voltage without external commands. This solves the problem of signal quality degradation due to noise interference.

In industrial equipment, the voltage measurement block and the signal processing block may need to be isolated for ground reference differences and noise suppression. When using a general AD converter, as shown in the reference circuit below, the number of components and cost increase become an issue.

The NA2100 can achieve conversion accuracy of 12 bits or higher with a simple circuit configuration. By isolating the output signal with a photocoupler, a simple isolated application can be configured. An operational amplifier can convert the photocoupler's output current signal to voltage in order to transmit the signal to the MCU. This product features high linearity over a wide range and solves the customer's problem by reducing the cost by decreasing the number of components (no AD converter or MCU is required for signal processing) as shown in Figure 1 and Figure 2.

Features

1. Provides Linearity over a Wide Range

This product provides conversion accuracy of 12 bits or higher with a simple circuit configuration. The linearity error specification is maximum ±0.018% of full scale. This value means a maximum of ±0.74 LSB of full scale when converted to 12 bits (4096 levels) and also meets the linearity of ±1 LSB or less. The output frequency has low distortion over a wide range from 10% to 90% of f_CLKIN. (BUF = OFF)

Figure 1. Output Frequency Range (VREF = 5 V)

2. Supports not only 3.3 V but 5 V Operating Voltage Which Is Commonly Used in Industrial Equipment

The NA2100 supports a 5 V operating voltage and can also operate at 3.3 V. Simple isolated sensing applications can be constructed by using this product with a photocoupler.

Figure 2. Block Diagram and Example of Simple, Isolated Sensing Circuit

Demonstration Board Photo

Crystal Oscillator Used (Kyushu Dentsu Co., Ltd.)

MEG30AD 1MHz (3225 metric size, 3.3V, 100ppm, -10℃ to +70℃)

MOT30AT 1MHz (2520 metric size, 3.3V, 100ppm, -10℃ to +70℃)

Product Photo

VSP-8-AF (MSOP8*)
* MEET JEDEC MO-187-DA

Main Specifications (Please refer to the datasheet for details.)

Applications

Simple 12-bit or higher AD converter
Simple isolated transfer from voltage measurement block to signal processing block
Battery monitoring system

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