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DS8500 Datasheet

HART Modem

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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


Maxim Integrated Semiconductor Electronic Components Datasheet

DS8500 Datasheet

HART Modem

No Preview Available !

DS8500
HART Modem
Absolute Maximum Ratings
Voltage Range on All Pins (including AVDD,
DVDD) Relative to Ground .................................-0.5V to +3.6V
Voltage Range on Any Pin Relative to
Ground Except AVDD, DVDD .............-0.5V to (VDVDD + 0.5V)
Operating Temperature Range ...........................-40°C to +85°C
Storage Temperature Range .............................-65°C to +150°C
Soldering Temperature...........................Refer to the IPC/JEDEC
J-STD-020 Specification.
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
(VDVDD = VAVDD = 2.7V to 3.6V, TA = -40°C to +85°C.) (Note 1)
PARAMETER
Digital Supply Voltage
Analog Supply Voltage
Ground
Digital Power-Fail Reset Voltage
Active Current
SYMBOL
VDVDD
VAVDD
GND
VRST
IDD
CONDITIONS
VAVDD = VDVDD
AGND = DGND
Monitors VDVDD
VAVDD = VDVDD = 2.7V (Note 2)
Input Low Voltage
VIL
Input High Voltage
Output Low Voltage
Output High Voltage
I/O Pin Capacitance
RST Pullup Resistance
Input Leakage Current XTAL,
RST
VIL
VOL
VOH
CIO
RRST
IILRX
IOL = 4mA
IOH = -4mA
Guaranteed by design (Note 3)
MIN
2.7
2.7
0
2.59
DGND
0.75 x
VDVDD
DGND
0.8 x
VDVDD
19
TYP
2.64
MAX
3.6
3.6
0
2.69
285
0.30 x
VDVDD
VDVDD
0.4
15
45
-30 +30
Input Leakage Current All Other
Pins
IIL
-2
Input Low Current for RST
IIL1 VIN = 0.4V
CLOCK SOURCE
External Clock Frequency
VOLTAGE REFERENCE
fHFIN
-1% 3.6864
Internal Reference Voltage
FSK INPUT
VREF
1.23
Input Voltage Range at FSK_IN
0
FSK OUTPUT
Output Voltage at FSK_OUT
Frequency of FSK_OUT (Note 4)
VOUT
AC-coupled max 30k load
For a mark
For a space
400 500
-1% 1200
-1% 2200
Note 1: Specifications to -40°C 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.
+2
170
+1%
VREF
600
+1%
+1%
UNITS
V
V
V
V
μA
V
V
V
V
pF
k
μA
μA
μA
MHz
V
V
mVP-P
Hz
www.maximintegrated.com
Maxim Integrated | 2


Part Number DS8500
Description HART Modem
Maker Maxim Integrated
PDF Download

DS8500 Datasheet PDF






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