DS8500

更新时间： 2024-11-27 06:54:43

品牌	Logo	应用领域
美信 - MAXIM		调制解调器
页数	文件大小	规格书
7页	125K
描述
HART Modem

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数据手册

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DS8500 数据手册

Rev 1; 2/09

HART Modem

DS850

General Description

Features

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 compo-

nents due to the integrated digital signal processing.

The input signal is sampled by an analog-to-digital con-

verter (ADC), followed by a digital filter/demodulator.

This architecture ensures reliable signal detection in

noisy environments. The output digital-to-analog con-

verter (DAC) generates a sine wave and provides a

clean signal with phase-continuous switching between

1200Hz and 2200Hz. Low power is achieved by dis-

abling the receive circuits during transmit and vice

versa. The DS8500 is ideal for low-power process con-

trol transmitters.

♦ 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

Applications

4–20mA Loop-Powered Transmitters for

Temperature, Pressure, Flow, and Level

Measurement

Ordering Information

PART

TEMP RANGE

PIN-PACKAGE

DS8500-JND+

-40°C to +85°C

20 TQFN-EP*

HART Multiplexers

+Denotes a lead(Pb)-free/RoHS-compliant package.

*EP = Exposed pad.

HART Modem Interface Connectivity

Pin Configuration

TOP VIEW

DGND 16

DGND 17

DGND 18

D_OUT 19

D_IN 20

10 XCEN

DGND

XTAL2

XTAL1

RTS

DS8500

*EP

THIN QFN

(5mm × 5mm)

*EXPOSED PAD.

________________________________________________________________ Maxim Integrated Products

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,

or visit Maxim’s website at www.maxim-ic.com.

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