The DS8500 is a single-chip modem with Highway Addressable Remote Transducer (HART) capabilities and satisfies the HART physical layer requirements. The device integrates the modulation and demodulation of the 1200Hz/2200Hz FSK signal, has very low power consumption, and needs only a few external components due to the integrated digital signal processing. The input signal is sampled by an analog-to-digital converter (ADC), followed by a digital filter/demodulator. This architecture ensures reliable signal detection in noisy environments. The output digital-to-analog converter (DAC) generates a sine wave and provides a 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.
Key Features
Applications/Uses
Single-Chip, Half-Duplex, 1200bps FSK Modulation and Demodulation
Digital Signal Processing Provides Reliable Input Signal Detection in Noisy Conditions
Sinusoidal Output Signal with Lowest Harmonic Distortion
Few External Components Enable a Space-Saving Solution
Standard Component 3.6864MHz Crystal
Complies to HART Physical Layer Requirements
2.7V to 3.6V Operating Voltage
285µA (max) Current Consumption
Space-Saving, 5mm x 5mm x 0.8mm, 20-Pin TQFN Package
4-20mA Loop-Powered Transmitters for Temperature, Pressure, Flow, and Level Measurement
* Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.
Devices:
1-2 of 2
DS8500
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Status
Package:
TYPE PINS FOOTPRINT
DRAWING CODE/VAR *
Temp
RoHS/Lead-Free? Materials Analysis
DS8500-JND+
Active
TQFN;20 pin;26 mm²
Outline Drawing: 21-0140 (PDF)
Land Pattern: 90-0008 (PDF)
Use pkgcode/variation: T2055+3*
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