HART调制解调器
The DS8500-JND+T&R is a HART modem in 20 pin TQFN package. It is a single chip modem with highway addressable remote transducer HART capabilities. The device integrates modulation and demodulation of 1200Hz/2200Hz FSK signal and has very low power consumption. The device needs only few external components due to integrated digital signal processing. The input signal is sampled by an ADC followed by digital filter/demodulator. This architecture ensures reliable signal detection in noisy environments. The output DAC generates a sine wave and provides clean signal with phase continuous switching between 1200Hz and 2200Hz. Low power is achieved by disabling the receive circuits during transmit and vice versa. The DS8500 is ideal for low power process control transmitters, HART multiplexers, HART modem interface connectivity, 4mA to 20mA loop powered transmitters for temperature, pressure, flow and level measurement.
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- Supply voltage range from 2.7V to 3.6V
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- Operating temperature range from -40°C to 85°C
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- Fully tested and verified as a HART registered modem IC
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- Fewer external components and small package reduces system cost and size
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- Overlays 1200bps FSK digital communication on top of installed 4mA to 20mA current loop
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- Digital signal processing provides reliable input signal detection in noisy conditions
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- Standard component 3.6864MHz crystal reduces system cost
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- Integrated solution requires minimal power and space
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- Active current of 285µA VAVDD = VDVDD = 2.7V
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- Digital power fail reset voltage of 2.64V monitors VDVDD
