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PDF DS8500 Data sheet ( Hoja de datos )
| Número de pieza | DS8500 | |
| Descripción | HART Modem | |
| Fabricantes | Maxim Integrated | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de DS8500 (archivo pdf) en la parte inferior de esta página. Total 7 Páginas | ||
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DS8500
EVALUATION KIT AVAILABLE
HART Modem
General Description
The DS8500 is a single-chip modem with Highway
Addressable Remote Transducer (HART) capabilities. It
has been fully tested and verified and has received a
HART® Certificate of Registration. 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 inte-
grated digital signal processing. The input signal is
sampled by an analog-to-digital converter (ADC), fol-
lowed 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.
Applications
4mA–20mA Loop-Powered Transmitters for
Temperature, Pressure, Flow, and Level
Measurement
HART Multiplexers
HART Modem Interface Connectivity
Benefits and Features
• Single-Chip, Half-Duplex Modem Overlays 1200bps
FSK Digital Communication on Top of Installed
4mA–20mA Current Loop Infrastructure
• Digital Signal Processing Provides Reliable Input
Signal Detection in Noisy Conditions
• Standard Component 3.6864MHz Crystal Reduces
System Cost
• Fully Tested and Verified as a HART-Registered
Modem IC
• Integrated Solution Requires Minimal Power and
Space
• 2.7V to 3.6V Operating Voltage
• 285µA (max) Current Consumption
• Space-Saving, 5mm x 5mm x 0.8mm, 20-Pin
TQFN Package
• Few External Components Required
Ordering Information
PART
TEMP RANGE
PIN-PACKAGE
DS8500-JND+
-40°C to +85°C
20 TQFN-EP*
+Denotes a lead(Pb)-free/RoHS-compliant package.
*EP = Exposed pad.
HART is a registered trademark of the HART Communication
Foundation. Membership in the HART Communication
Foundation does not guarantee a product has been verified or
received a HART Registration Certificate.
Pin Configuration
TOP VIEW
15 14 13 12 11
DGND 16
MODE 17
DGND 18
D_OUT 19
D_IN 20
+
DS8500
*EP
10 XCEN
9 DGND
8 XTAL2
7 XTAL1
6 RTS
12345
*EXPOSED PAD.
THIN QFN
(5mm × 5mm)
19-7581; Rev 2; 4/15
1 page  
DS8500
HART Modem
D_IN
FSK_OUT
1200bps/833µs
START
8-BIT DATA
Figure 2. Actual DS8500 Modulator Waveform
STOP
PARITY
FSK_IN
D_OUT
START
8-BIT DATA
STOP
PARITY
1200bps/833µs
ONE UART CHARACTER (START, 8 DATA BITS, PARITY, STOP)
Figure 3. Actual DS8500 Demodulator Waveform
www.maximintegrated.com
Maxim Integrated | 5
5 Page | ||
| Páginas | Total 7 Páginas | |
| PDF Descargar | [ Datasheet DS8500.PDF ] | |
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