Philips Medical Systems North America MDL4851 2.4 GHz Radio Module User Manual

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Document ID	731329
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Document Description	Users Manual
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Date Submitted	2006-11-22 00:00:00
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Creation Date	2006-11-22 13:46:55
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Document Title	Microsoft Word - Philips_Instructions_for_Use_Application_Note_MDL4851_Module.doc
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Philips Medical Systems
Patient Monitoring
Quality & Regulatory Group
3000 Minuteman Road
Mailstop 0490
Andover, MA 01810
Tel: (978) 659-7383
Fax: (978) 685-5624
Application Note: MDL4851-MODULE
Prepared by:
Last revised:
Delroy Smith
22-Nov-06
The following information is intended for Philips internal use only. It is a guide for the incorporation of the MDL4851
module into Philips patient monitoring medical devices. Interested Philips engineers should contact the Wireless ER
Manager for additional information and referral to specific design specialists.
This document is an internally controlled document under the Philips Quality System.
Page 2 of 8
Table of Contents
Table of Contents ..................................................................................................................... 2
Introduction............................................................................................................................... 2
Host Interface ........................................................................................................................... 3
Serial Connection ..................................................................................................................... 4
4.1 Serial Specification: ............................................................................................................ 4
4.2 Maximum User Data Rate: ................................................................................................. 4
MDL4851-MODULE RF Shielding. .......................................................................................... 5
MDL4851-MODULE Mounting Considerations. ....................................................................... 6
RF Input/Output, Antenna ........................................................................................................ 6
7.1 RF Transmitter Specifications ............................................................................................ 6
Fault Conditions ....................................................................................................................... 7
8.1 Over/ Under Voltage........................................................................................................... 7
8.2 Excessive Signal Level on Serial Input .............................................................................. 7
8.3 Excessive Data Rate on Serial Input.................................................................................. 7
Accompanying Documentation for products incorporating the MDL4851-MODULE ............... 8
Introduction
The MDL4851-MODULE is a serial network adapter designed to be used with specialized medical
devices manufactured by Philips Medical Systems (Figure 1). It enables the host medical device
to wirelessly establish bi directional communication with other remote devices using the Philips’
2.4GHz ROW infrastructure.
Page 3 of 8
Figure 1: MDL4851-MODULE Block Diagram
Host Interface
The MDL4851 radio module interfaces to the host though a single I/O connector (Figure 2). Via
this connector the host must supply DC power, signal ground and modulating data to the radio
module. The communication between the host device and the radio module is a two wire
asynchronous serial interface (Table 1).
Figure 2: MDL4851-MODULE Interface Host Connector
Page 4 of 8
Pin
Name
Ground
ITS_Tx
I/O
OUT
Function
First of two ground connections for the module.
Serial data to host.
ITS_Rx
IN
Serial data from host.
Ground
+5 vdc
Second of two ground connections for the module.
+ 5 vdc +/- 5%,
Sinks 38 mA average, 320 mA Peak during radio Tx/Rx
Not
Connected
Table 1: Host Connector pin assignment
4.1
Serial Connection
Serial Specification:
The interface to the Host is a serial communication link (Table 2):
Æ Flow Control:
Æ Baud Rate:
Æ Parity:
Æ Bits:
Æ Logic Levels:
Tx, Rx; no hardware flow control
115.2 kbaud;
No parity bit
8 bits of data, plus 1 Start/Stop bits
TTL levels, 5 volt tolerant.
ITS_Tx
Logical Zero
LOW
0.1 V max
0.55V max
Logical One
HIGH
2.9V min
2.3V min
ITS_Rx
0.6V max
2.2V min
Table 2: Serial Lines, Electrical DC Characteristics
4.2
Conditions
100uA sink
24mA sink
100uA load
24mA load
Maximum User Data Rate:
The maximum user data rate that the radio supports is 12 kbits/second in each direction. This
maximum over the air data rate is fixed by design and cannot be modified by the user.
Page 5 of 8
MDL4851-MODULE RF Shielding.
The module contains all necessary RF shielding. The host device does not need to provide
additional shielding. The available module metal enclosure is optional, it is not needed to achieve
EMC compliance.
Page 6 of 8
MDL4851-MODULE Mounting Considerations.
The module is self-contained and can be mounted anywhere using the supplied threaded pem
nuts. No special heat sinking considerations are required. There are no orientation constraints.
RF Input/Output, Antenna
The MDL4851 Radio Module is approved for use with multiple antennas specified by Philips, part
numbers M4842-61400 and M8100-66490. This antenna cannot be replaced with an antenna of a
different type. However, antenna of equivalent gain & type to the qualified antennas can be used.
The RF input and output of the MDL4851-MODULE is matched to 50 ohms. A coaxial cable
brings the RF outside the metal enclosure. This cable uses a unique non standard connector
manufactured by JST (JST part number AYUI-1S-12676-221). The coaxial cable connects to a
JST to reversed TNC adapter made by Amphenol (Amphenol part number 031-6101) where the
antenna plugs in. The antenna is made by Radial to Philips’ specifications (Philips specifications
number A-M4842-61400-1, rev A).
7.1
RF Transmitter Specifications
The following table summarizes general transmitter specifications (Table 3). For complete details
(including details on the receiver section) refer to ES-M4840-90145:
Parameter
Specification
Frequency range
ISM Band: 2400-2483.5MHz
Radio Channel assignment
48 Radio Channel assigned from 2401.056 MHz to 2482.272 MHz,
with Channels Spacing: 1.728 MHz
Frequency Control
Frequency Control to select smart hopper operating frequencies,
only 3 frequencies needed to achieve performance.
A maximum of 6 channels can be selected from the list of 48
channels.
FCC: 17 dBm +/-1dB (40 mW to 63 mW, nominal 50mW), into
antenna load
RF Output Power
ETSI: 7.0 dBm +/-1dB (4 mW to 6.3 mW, nominal 5.0mW), into
antenna load.
Japan: 8.5 dBm +/-1dB (5.6 mW to 8.9 mW, nominal 7.1mW),
into antenna load.
Note: a) Antenna gain is 2.0dBi max
Transceiver frequency
during normal operation
accuracy <+60/-100KHz relative to channel frequency, includes temperature
compensation & aging effects.
Page 7 of 8
Modulation type
GFSK, Gaussian Frequency Shift keying (1M40Q7D)
Modulation Bandwidth
Typically 1.4MHz (20dB Bandwidth)
Out of band spurious emission < -41dBm in 1MHz bandwidth for FCC limit
Levels
Meets ETSI, RS210, FCC, ARIB standards
Table 3: MDL4851 Radio Module, Transmitter Specifications
Applicable
Allowed
channels
Operating Frequency
Range
Max Power from
Antenna (EIRP)
ETSI
1-46
2402.784 - 2480.544 MHz
10 dBm
FCC, RS-210
0-47
2401.056 - 2482.272 MHz
20 dBm
JAPAN, ARIB
0-47
2401.056 - 2482.272 MHz
12.1dBm
AUS/NZ
1-46
2402.784 - 2480.544 MHz
10 dBm
Regulatory
Rule
Table 4 Radio Specification, MDL4851 Channel Frequency Rules
8.1
Fault Conditions
Over/ Under Voltage
The input voltage from the DC power source to the module must remain between the values
specified in Table 1. Operating the radio module from a voltage lower source lower than 4.75VDc
or higher that 5.25 vdc can cause the regulator section to shut down ceasing operation of the
radio module.
8.2
Excessive Signal Level on Serial Input
The data input signal levels must be observed as specified in Table 2. Driving the input data line
over 5 vdc can cause damage to the radio module input buffers, causing interruption of data
transfer.
8.3
Excessive Data Rate on Serial Input
The host serial communication data rate is fixed at 115.2 kbaud. Clocking data at different baud
rates will result in incorrect data transfer. The maximum host/user over the RF link data rate is 12
kbps. Attempting to send data at a faster rate will result in data buffer overrun and data loss.
Page 8 of 8
Accompanying Documentation for products incorporating the
MDL4851-MODULE
Products which incorporate this device will be labeled “Contains FCC ID: PQC-MDL4851”, and
their accompanying documentation should prominently display the following:
Self declaration FCC logo ‘This device complies with part 15 of the FCC Rules. Operation is
subject to the condition that this device does not cause harmful interference’

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Title                           : Microsoft Word - Philips_Instructions_for_Use_Application_Note_MDL4851_Module.doc

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