EVALUATION KIT AVAILABLE Click here for production status of specific part numbers. DS8500 HART Modem General Description Benefits and Features The DS8500 is a single-chip modem with Highway Single-Chip, Half-Duplex Modem Overlays 1200bps FSK Digital Communication on Top of Installed 4mA Addressable Remote Transducer (HART) capabilities. 20mA Current Loop Infrastructure It has been fully tested and verified and has received a HART Certificate of Registration. The device integrates Digital Signal Processing Provides Reliable Input the modulation and demodulation of the 1200Hz/2200Hz Signal Detection in Noisy Conditions FSK signal, has very low power consumption, and needs Standard Component 3.6864MHz Crystal Reduces only a few external components due to the integrated System Cost digital signal processing. The input signal is sampled by Fully Tested and Verified as a HART-Registered an analog-to-digital converter (ADC), followed by a digi- Modem IC tal filter/demodulator. This architecture ensures reliable signal detection in noisy environments. The output digital- Integrated Solution Requires Minimal Power and to-analog converter (DAC) generates a sine wave and Space provides a clean signal with phase-continuous switching 2.7V to 3.6V Operating Voltage 285A (max) Current Consumption between 1200Hz and 2200Hz. Low power is achieved by disabling the receive circuits during transmit and vice Space-Saving, 5mm x 5mm x 0.8mm, 20-Pin TQFN Package versa. The DS8500 is ideal for low-power process control transmitters. Few External Components Required Applications Ordering Information 4mA20mA Loop-Powered Transmitters for PART TEMP RANGE PIN-PACKAGE Temperature, Pressure, Flow, and Level DS8500-JND+ -40C to +85C 20 TQFN-EP* Measurement +Denotes a lead(Pb)-free/RoHS-compliant package. HART Multiplexers *EP = Exposed pad. HART Modem Interface Connectivity Pin Configuration TOP VIEW 15 14 13 12 11 DGND 16 10 XCEN MODE 17 9 DGND DS8500 DGND 18 8 XTAL2 D OUT 19 7 XTAL1 *EP D IN 20 + 6 RTS HART is a registered trademark of the HART Communication 1 2 3 4 5 Foundation. Membership in the HART Communication Foundation does not guarantee a product has been verified or received a HART Registration Certificate. THIN QFN (5mm x 5mm) *EXPOSED PAD. 19-7581 Rev 3 2/20 DVDD AGND DVDD FSK IN DGND REF RST FSK OUT OCD AVDDDS8500 HART Modem Absolute Maximum Ratings Voltage Range on All Pins (including AVDD, Operating Temperature Range ........................... -40C to +85C DVDD) Relative to Ground ...............................-0.5V to +3.6V Storage Temperature Range ............................ -65C to +150C Voltage Range on Any Pin Relative to Soldering Temperature ..........................Refer to the IPC/JEDEC Ground Except AVDD, DVDD ...........-0.5V to (V + 0.5V) J-STD-020 Specification. DVDD Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Recommended DC Operating Conditions (V = V = 2.7V to 3.6V, T = -40C to +85C.) (Note 1) DVDD AVDD A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Digital Supply Voltage V 2.7 3.6 V DVDD Analog Supply Voltage V V = V 2.7 3.6 V AVDD AVDD DVDD Ground GND AGND = DGND 0 0 V Digital Power-Fail Reset Voltage V Monitors V 2.59 2.64 2.69 V RST DVDD Active Current I V = V = 2.7V (Note 2) 285 A DD AVDD DVDD 0.30 x Input Low Voltage V DGND V IL V DVDD 0.75 x Input High Voltage V V V IL DVDD V DVDD Output Low Voltage V I = 4mA DGND 0.4 V OL OL 0.8 x Output High Voltage V I = -4mA V OH OH V DVDD I/O Pin Capacitance C Guaranteed by design (Note 3) 15 pF IO RST Pullup Resistance R 19 45 k RST Input Leakage Current XTAL, RST I -30 +30 A ILRX Input Leakage Current All Other Pins I -2 +2 A IL Input Low Current for RST I V = 0.4V 170 A IL1 IN CLOCK SOURCE External Clock Frequency f -1% 3.6864 +1% MHz HFIN VOLTAGE REFERENCE Internal Reference Voltage V (Note 5) 1.23 V REF FSK INPUT Input Voltage Range at FSK IN 0 V V REF FSK OUTPUT Output Voltage at FSK OUT V AC-coupled max 30k load 400 500 600 mV OUT P-P For a mark -1% 1200 +1% Frequency of FSK OUT (Note 4) Hz For a space -1% 2200 +1% Note 1: Specifications to -40C are guaranteed by design and are not production tested. Note 2: Active currents are measured when the device is driven by an external clock XCEN = 1 condition. Note 3: Guaranteed by design and not production tested. Note 4: Accuracy is guaranteed based on the external crystal or clock provided. Note 5: V voltage is output only in demodulator mode. REF Maxim Integrated 2 www.maximintegrated.com