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DATA BULLETIN
MX469
Features
Selectable Data Rates 1200/2400/4800bps Full-Duplex MSK RX and TX Bandpass Filters Clock Recovery and Carrier Detect Capabilities Pin Selected Xtal/Clock Inputs 1.008MHz or 4.032MHz
TX GENERATOR TX DATA I/P TX ENABLE CLOCK RATE TX FILTER
1200/2400/4800bps MSK Modem
Applications
Radio and General Applications Data-Over-Radio PMR/Cellular Signaling Portable Data Terminals Personal/Cordless Telephone
TX SIGNAL O/P TX SYNC O/P
VDD
XTAL/CLOCK CLOCK OSCILLATOR XTAL 1200/2400 BPS SELECT 4800 BPS SELECT BANDPASS O/P RX ENABLE RX FILTER LIMITER RETRIGGERABLE MONOSTABLE DIGITAL FILTER DATA FILTER LIMITER UNCLOCKED DATA O/P DIVIDER
f..
V BIAS
n
VSS
RX SIGNAL I/P
RECTIFIER DIGITAL PLL DATA LATCH
CLOCKED DATA O/P RX SYNC O/P
NOISE FILTER
RECTIFIER S/N COMPARATOR CARRIER DETECT TIME CONSTANT CARRIER DETECT O/P
The MX469 is a full-duplex pin-selectable 1200/2400/4800bps Minimum Shift Key (MSK) Modem for FM radio links. The mark and space frequencies are 1200/1800, 1200/2400, and 2400/4800Hz respectively. Tone frequencies are phase continuous; transitions occur at the zero crossing point. The use of a common Xtal oscillator with a choice of two clock frequencies (1.008MHz or 4.032MHz) provides data-rate, transmit frequencies, and RX/TX synchronization. The transmitter and receiver operate entirely independently including individual section powersave functions. The MX469 includes on-chip circuitry for Carrier Detect and RX Clock Recovery, both of which are made available at output pins. RX, TX, and Carrier Detect circuits contain bandpass filters to provide high quality signals in their respective paths. The carrier detect time constant is set by an external capacitor, whose value should be arranged as required to further enhance this product's performance in high-noise environments. The MX469 demonstrates high sensitivity and good bit-error-rate under adverse signal conditions. This low-power device requires few external components and is available in the following packages: 24-pin SOIC (MX469DW), 22-pin PDIP (MX469P), and 20-pin SOIC (MX469D3).
1998 MX-COM, Inc. www.mxcom.com Tel: 800 638 5577 336 744 5050 Fax: 336 744 5054 Doc. # 20480081.010
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA
All trademarks and service marks are held by their respective companies.
1200/2400/4800bps MSK Modem
2
MX469
Contents
Section Page
1. Block Diagram................................................................................................................ 3 2. Signal List....................................................................................................................... 4 3. External Components.................................................................................................... 6 4. General Description....................................................................................................... 7
4.1 Timing.................................................................................................................................. 7
4.1.1 1200bps .................................................................................................................................. 7 4.1.2 2400bps .................................................................................................................................. 8 4.1.3 4800bps .................................................................................................................................. 9
5. Application ................................................................................................................... 10
5.1 5.2 Synchronous Modem Design Considerations ................................................................... 10 Bit Error Rate..................................................................................................................... 11
6. Performance Specifications........................................................................................ 12
6.1 Electrical Specifications..................................................................................................... 12
6.1.1 Absolute Maximum Limits ..................................................................................................... 12 6.1.2 Operating Limits .................................................................................................................... 12 6.1.3 Operating Characteristics...................................................................................................... 13 6.1.4 Packages .............................................................................................................................. 15 MXCOM, Inc. reserves the right to change specifications at any time and without notice.
1998 MX-COM, Inc.
www.mxcom.com Tel: 800 638 5577 336 744 5050 Fax: 336 744 5054
Doc. # 20480081.010
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA
All trademarks and service marks are held by their respective companies.
1200/2400/4800bps MSK Modem
3
MX469
1. Block Diagram
TX GENERATOR TX DATA I/P TX ENABLE CLOCK RATE TX FILTER TX SIGNAL O/P TX SYNC O/P
VDD
XTAL/CLOCK CLOCK OSCILLATOR XTAL 1200/2400 BPS SELECT 4800 BPS SELECT BANDPASS O/P RX ENABLE RX FILTER LIMITER RETRIGGERABLE MONOSTABLE DIGITAL FILTER DATA FILTER LIMITER UNCLOCKED DATA O/P DIVIDER
f..
V BIAS
n
VSS
RX SIGNAL I/P
RECTIFIER DIGITAL PLL DATA LATCH
CLOCKED DATA O/P RX SYNC O/P
NOISE FILTER
RECTIFIER S/N COMPARATOR CARRIER DETECT TIME CONSTANT CARRIER DETECT O/P
Figure 1: Block Diagram
1998 MX-COM, Inc.
www.mxcom.com Tel: 800 638 5577 336 744 5050 Fax: 336 744 5054
Doc. # 20480081.010
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA
All trademarks and service marks are held by their respective companies.
1200/2400/4800bps MSK Modem
4
MX469
2. Signal List
Signal P 1 DW 1 D3 1 Xtal/Clock input The input to the on-chip inverter, for use with either a 1.008MHz or a 4.032MHz Xtal or external clock. Clock frequency selection is by the "Clock Rate" input pin. The selection of this frequency will affect the operational Data Rate of this device. Refer to Table 3. Operation of any MX*COM IC without a Xtal or clock input may cause device damage. To minimize damage in the event of a Xtal/drive failure, it is recommended that a current limiting device (resistor or fast-reaction fuse) be installed on the power supply (VDD). Output of the on-chip inverter. A squarewave, produced on-chip, to synchronize the input of logic data and transmission of the MSK signal (See Figure 3). When the transmitter is enabled, this pin outputs the (140-step pseudo sinewave) MSK signal (See Figure 3). With the transmitter disabled, this output is set to a highimpedance state. Serial logic data to be transmitted is input to this pin. A logic `0' will enable the transmitter (See Figure 3). A logic `1' at this input will put the transmitter into powersave while forcing "TX Sync Out" to a logic `1' and "TX Signal Out" to a high-impedance state. This pin is internally pulled to VDD. The output of the RX Bandpass Filter. This output impedance is typically 10k and may require buffering prior to use. The control of the RX function. The control of other outputs is provided in Table 2 The output of the on-chip analog bias circuitry. Held internally at VDD/2, this pin should be decoupled to VSS by a capacitor (C2). See Figure 2 and RX Enable notes. This bias voltage is maintained under all powersave conditions. Negative supply (GND). The recovered asynchronous serial data output from the receiver. The recovered synchronous serial data output from the receiver. Data is latched out by the recovered clock, available at the "RX Sync O/P". (See Figure 4 and Figure 6). For 1200 and 2400bps operation only. When an MSK signal is being received this output is a logic `1'. The Carrier Detect signal should be ignored during 4800bps operation. The MSK signal input for the receiver. This input should be coupled via a capacitor, C3. Type Description
2 3
2 3
2 3
Xtal TX Sync
output output
5
5
4
TX Signal
output
6 7
7 8
5 6
TX Data TX Enable
input Input
8
9
7
Bandpass
output
9 10
10 11
8 9
RX Enable VBIAS
Input power
11 12 13
12 13 14
10 11 12
VSS Unclocked Data Clocked Data
power output output
14
15
13
Carrier Detect
output
15
16
14
RX Signal
input
1998 MX-COM, Inc.
www.mxcom.com Tel: 800 638 5577 336 744 5050 Fax: 336 744 5054
Doc. # 20480081.010
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA
All trademarks and service marks are held by their respective companies.
1200/2400/4800bps MSK Modem
5
MX469
Signal P 17 DW 18 D3 15 RX Sync
Type output
Description A flywheel squarewave output. This clock will synchronize to incoming RX MSK data. (See Figure 4 and Figure 6). A logic `1' on this pin selects the 1200bps option; tone frequencies are one cycle of 1200Hz represents a logic `1', one-and-a-half cycles of 1800Hz represents a logic `0'. A logic `0' on this pin selects the 2400bps option; tone frequencies are one-half cycle of 1200Hz represents a logic `1', one cycle of 2400Hz represents a logic `0'. This pin has an internal 1M pull-up resistor. Operational Data Rate Configurations are illustrated in Table 3 A logic '1' on this pin combined with a logic '0' on the 1200/2400 BPS Select pin will select the 4800 option (1M pulldown resistor). Tone frequencies are: one-half cycle of 2400Hz represents a logic '1', one cycle of 4800Hz represents a logic '0'. This state can only be achieved using a 4.032MHz Xtal input. Operational Data Rate Configurations are illustrated in Table 3 A logic input to select and allow the use of either a 1.008MHz or 4.032MHz Xtal/clock. Logic `1' = 4.032MHz, logic `0' = 1.008MHz. This input has an internal pulldown resistor (1.008MHz). Part of the carrier detect integration function. The value of C4 connected to this pin will affect the carrier detect response time and therefore the noise performance (See Figure 2, Note 3). Positive supply. A single 5-volt supply is required. No Internal Connection.
16
19
16
1200/ 2400 BPS Select
input
18
20
17
4800 BPS Select
input
19
21
18
Clock Rate
input
20
23
19
Carrier Detect Time Constant
output
22 4, 21
24 4, 6, 17, 22
20
VDD N/C
power
Table 1: Signal List
RX Enable 1 0
= = =
RX Function Enabled Powersave
Clock Data Output Enable 0
Carrier Detect Enabled 0
Rx Sync Out Enabled 1 or 0
Table 2: RX Enable Control Functions
XTAL/CLOCK Frequency Clock Rate pin 1200/2400 Select Pin 4800 Select Pin Data Rate (bps)
1.008MHz 0 1 0 1200 0 0 0 2400 1 1 0 1200
4.032MHz 1 0 0 2400 1 0 1 4800
Table 3: Operational Data Rate Configuration
1998 MX-COM, Inc.
www.mxcom.com Tel: 800 638 5577 336 744 5050 Fax: 336 744 5054
Doc. # 20480081.010
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA
All trademarks and service marks are held by their respective companies.
1200/2400/4800bps MSK Modem
6
MX469
3. External Components
VDD
XTAL/CLOCK X1 C1 C6 R1 XTAL TX SYNC OUT TX SIGNAL OUT TX DATA IN
1 2 3 4 5 6 7 8 9 10
20 19 18 17 16 15 14 13 12 11
VDD
C7
CARRIER DETECT TIME CONSTANT
CLOCK RATE 4800 BPS SELECT 1200/2400 BPS SELECT RX SYNC OUT RX SIGNAL IN C3
C4
VDD
TX ENABLE BANDPASS OUT
MX469
C5
RX ENABLE
CARRIER DETECT OUT CLOCKED DATA OUT UNCLOCKED DATA OUT
VBIAS VSS
C2
Figure 2: Recommended External Components
Component R1 C1 C2 C3 C4 C5 C6 C7 X1
Notes
Value 1.0M 33pF 1.0F 0.1F
Tolerance 10% 5% 20% 20% 10% 25% 5% 20% See `Clock-Rate' Pin
Note 1 Note 2 Note 3 Note 2 Note 4
0.1F 1.0F 33pF 1.0F 1.008MHz or 4.032MHz
Table 4: Recommended External Components Notes: 1. The value of C4 determines the Carrier Detect time constant. A long time constant results in improved noise immunity but increased response time. C4 may be varied to trade-off response time for noise immunity. 2. Decoupling circuits depend upon whether the input signal is referenced to VBIAS or VSS. Use C5 when the input signal is referenced to VBIAS. Use C7 when the input signal is referenced to VSS. It is not necessary to use both C5 and C7. 3. C6 reduces Xtal voltage overshoot. Reference the MX-COM Xtal Application Note. 4. For best results, a crystal oscillator design should drive the clock inverter input with signal levels of at least 40% of VDD, peak to peak. Tuning fork crystals generally cannot meet this requirement. To obtain crystal oscillator design assistance, consult your crystal manufacturer.
1998 MX-COM, Inc.
www.mxcom.com Tel: 800 638 5577 336 744 5050 Fax: 336 744 5054
Doc. # 20480081.010
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA
All trademarks and service marks are held by their respective companies.
1200/2400/4800bps MSK Modem
7
MX469
4. General Description
4.1 Timing
4.1.1 1200bps
Characteristics
TX Enable to TX Sync Rise Time TX Delay, Signal to Disable Time Data Set-Up Time Data Hold Time TX Delay to O/P Time TX Data Rate Period RX Data Rate Period Undetermined State Internal RX Delay tID 1.5 tSYNC tESET tDSET tDH tTXD tTDR tRDR 800 1 2.0 2.0 2.0 1.2 833 865 2.0
Note
Min.
Typ.
416
Max.
800
Unit
s s s s s s s s ms
Notes: 1. Consider the Xtal/clock tolerance. 2. All TX timings are related to the TX Sync Output.
t SYNC
TX ENABLE
t ESET
TX SYNC
t DSET
TX DATA
DC = Don't Care DV = Data Valid
t DH
t TDR
DV DC DV
t TDR
DC
DC
DV
DC
t TXD
OPEN CIRCUIT
1200 BPS TX OUTPUT
OPEN CIRCUIT
Figure 3: Transmitter Timing: 1200bps
LOGIC '1'
LOGIC '0'
RX SIGNAL I/P 1200 BPS
1
t ID
RX SYNC O/P (1200Hz)
0
t RDR
1
Undetermined State
CLOCKED DATA O/P
0
LOGIC '1'
LOGIC '0'
Figure 4: Receiver Timing Diagram: 1200bps
1998 MX-COM, Inc. www.mxcom.com Tel: 800 638 5577 336 744 5050 Fax: 336 744 5054 Doc. # 20480081.010
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA All trademarks and service marks are held by their respective companies.
1200/2400/4800bps MSK Modem
8
MX469
4.1.2 2400bps
Characteristics
TX Enable to TX Sync Rise Time TX Delay, Signal to Disable Time Data Set-Up Time Data Hold Time TX Delay to O/P Time TX Data Rate Period RX Data Rate Period Undetermined State Internal RX Delay tID 1.5 tSYNC tESET tDSET tDH tTxD tTDR tRDR 400 1 2.0 2.0 2.0 1.2 416 433 2.0
Note
Min.
Typ.
208
Max.
400
Unit
s s s s s s s s ms
Notes: 1. Consider the Xtal/Clock tolerance. 2. All TX timings are related to the TX Sync Output.
t SYNC
TX ENABLE
t ESET
TX SYNC
t DSET
TX DATA
DC = Don't Care DV = Data Valid
t DH
t TDR
DC DV DC DV DC DV
t TDR
DC DV DC
DC
DV
DC
DV
t TXD
2400 BPS TX OUTPUT
OPEN CIRCUIT
OPEN CIRCUIT
Figure 5: Transmitter Timing: 2400bps
LOGIC '1'
LOGIC '0'
LOGIC '1'
LOGIC '0'
RX SIGNAL I/P 2400 BPS
1
t ID
RX SYNC O/P (2400Hz)
0
t RDR
1
Undetermined State
CLOCKED DATA O/P
0
LOGIC '1'
LOGIC '0'
LOGIC '1'
LOGIC '0'
Figure 6: Receiver Timing: 2400bps
1998 MX-COM, Inc.
www.mxcom.com Tel: 800 638 5577 336 744 5050 Fax: 336 744 5054
Doc. # 20480081.010
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA
All trademarks and service marks are held by their respective companies.
1200/2400/4800bps MSK Modem
9
MX469
4.1.3 4800bps
Characteristics
TX Enable to TX Sync Rise Time TX Delay, Signal to Disable Time Data Set-Up Time Data Hold Time TX Delay to O/P Time TX Data Rate Period RX Data Rate Period Undetermined State Internal RX Delay tID 1.0 tSYNC tESET tDSET tDH tTxD tTDR tRDR 200 1 2.0 2.0 2.0 1.2 208 216 2.0
Note
Min.
Typ.
104
Max.
200
Unit
s s s s s s s s ms
Notes: 1. Consider the Xtal/Clock tolerance. 2. All TX timings are related to the TX Sync Output.
t SYNC
TX ENABLE
t ESET
TX SYNC
t DSET
TX DATA
DC = Don't Care DV = Data Valid
t DH
t TDR
DC DV DC DV DC DV
t TDR
DC DV DC
DC
DV
DC
DV
t TXD
4800 BPS TX OUTPUT
OPEN CIRCUIT
OPEN CIRCUIT
Figure 7: Transmitter Timing: 4800bps
LOGIC '1'
LOGIC '0'
LOGIC '1'
LOGIC '0'
RX SIGNAL I/P 4800 BPS
1
t ID
RX SYNC O/P (4800Hz)
0
t RDR
1
Undetermined State
CLOCKED DATA O/P
0
LOGIC '1'
LOGIC '0'
LOGIC '1'
LOGIC '0'
Figure 8: Receiver Timing: 4800bps
1998 MX-COM, Inc.
www.mxcom.com Tel: 800 638 5577 336 744 5050 Fax: 336 744 5054
Doc. # 20480081.010
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA
All trademarks and service marks are held by their respective companies.
1200/2400/4800bps MSK Modem
10
MX469
5. Application
5.1 Synchronous Modem Design Considerations
The MX469 is an easily applied data pump, which can be used with many protocols. Because it is an MSK, or minimum shift keying, modem, it achieves a more noise resistant, higher data rate in a narrower bandwidth than other FSK (frequency shift keying) modems. This characteristic is especially important for wireless applications because it fundamentally determines the bandwidth of RF transmissions, which are strictly limited and controlled by regulatory agencies. Using MSK signaling, the MX469 data modem can achieve a 2400bps data rate within the typical 300-3000 Hz voice band of many common radios. In order to achieve this advantage, an MSK modem must precisely control the bit rate and timing of the modulated Tx output signal bits. This control is asserted by the MSK modem with a data clock signal, which is output, by the modem to pace the Tx data source (e.g. a microcontroller). The data clock signal, in effect, indicates when the Tx data source should provide the next Tx data bit to the modem. See Figure 9. Because this type of interface involves the use of a modem generated bit clock signal to control the timing of when new Tx data bits must be supplied from the data source, the interface is called synchronous. Another characteristic of a synchronous modem is that, to receive data, it must first learn the data bit timing of the Rx signal stream before it can accurately demodulate Rx data bits. Accordingly, a synchronous modem undergoes a period of training or synchronization when it first begins to receive a stream of MSK modulated signal. During this initial receive phase, the received signal is evaluated over several bit times as the modem `locks on' and achieves proper receive synchronization. The training sequence, called a preamble, is a specific data pattern which must be added to the `front' of a transmit data stream with the start of each new transmission. A specific preamble data pattern (e.g. 16 bits of alternating 0,1,0,1... for the MX469) is used to optimize the training accuracy while minimizing the number of preamble bits required.
Tx data
DATA: 0 1 1 0 1 1 MSK Modem Transmitting
Give me BIT 1 I took BIT 1 Give me BIT 2 I took BIT 2 Give me BIT 3 I took BIT 3
Data Bit Tx Source (e.g. C)
Tx SYNC (data clock)
MSK Tx Out
Figure 9: Synchronous Transmit Operation Non-synchronous or asynchronous interfaces are commonly found in wired applications which do not have the bandwidth efficiency requirements of wireless systems. A well known example is the serial port of a personal computer which can transmit a 1200 bps (or faster) data signal over a single Tx signal without using an additional data clock signal to control the precise rate and timing of data bits being transmitted to a typical telephone line data modem. Popular modem standards such as Bell 202 and v.23 use FSK signaling to pass such asynchronous serial port data signals over telephone systems. Another aspect of asynchronous interfaces and modems is that they can carry data streams which are not at the exact, nominal data rate. For example, a 1200 bps FSK modem will typically operate properly when supplied with transmit data streams of 1201 bps or 1199 bps. Because of the differences in synchronous and asynchronous interfaces, they cannot successfully operate if directly connected. In other words, a personal computer's RS232 serial port cannot directly interface to an MSK modem. This is because: The asynchronous interface may provide data bits too fast or too slow compared to the precise rate required for MSK signaling (a bit rate, or pacing, incompatibility). The timing of each specific data bit presented by an asynchronous interface will not be aligned with the precise bit timing required for MSK signaling (a bit timing incompatibility).
Synchronous and asynchronous interface can be successfully interfaced for applications requiring the advantages of both. This typically involves the use of data buffering and retiming circuits to resolve the timing and pacing issues.
1998 MX-COM, Inc. www.mxcom.com Tel: 800 638 5577 336 744 5050 Fax: 336 744 5054 Doc. # 20480081.010
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA
All trademarks and service marks are held by their respective companies.
1200/2400/4800bps MSK Modem
11
MX469
5.2 Bit Error Rate
VDD VDD
MILLIAMMETER
MILLIAMMETER CLOCKED DATA OUT
TX DATA I/P PREAMBLE & PSEUDO-RANDOM DATA GENERATOR MX469 TRANSMITTER
(components as Fig. 2)
TX SIGNAL O/P BUFFER
(INTERFACE) CIRCUIT
S3 TELEPHONE CHANNEL SIMULATOR
(with attenuator & 5kHz BW noise gen)
RX SIGNAL IN MX469 RECEIVER
(components as Fig. 2)
RX SYNC
ERROR DETECTOR
Tx SYNC TRUE RMS VOLTMETER TRUE RMS VOLTMETER CARRIER DETECT OUT CARRIER DETECT OUT HIGH DETECTOR
OSCILLOSCOPE
Figure 10: MX469 Test Set-Up
Figure 11: Typical Variation of Bit Error Rate with Input Level
1998 MX-COM, Inc.
www.mxcom.com Tel: 800 638 5577 336 744 5050 Fax: 336 744 5054
Doc. # 20480081.010
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA
All trademarks and service marks are held by their respective companies.
1200/2400/4800bps MSK Modem
2 x 10-2 10 -2
12
MX469
MX469
IDEAL COHERENT MSK
BIT ERROR RATE (log scale)
10 -3
10 -4
8 6 4
2
10 -5 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
SNR (dB) BIT RATE BANDWIDTH (lin scale)
Figure 12: RX Bit-Error-Rate vs. Signal-to-Noise Ratio
6. Performance Specifications
6.1 Electrical Specifications
6.1.1 Absolute Maximum Limits
Exceeding these maximum ratings can result in damage to the device. General Supply (VDD-VSS) Voltage on any pin to VSS Current VDD VSS Any other pin DW / D3 / P Packages Derating above 25C Operating Temperature Storage Temperature -40 -55 10 85 125 mW/C above 25C C C -30 -30 -20 30 30 20 mA mA mA Notes Min. -0.3 -0.3 Typ. Max. 7.0 VDD + 0.3 Units V V
6.1.2 Operating Limits
Correct Operation of the device outside these limits is not implied. Notes Supply (VDD-VSS) Operating Temperature Xtal Frequency Min. 4.5 -40 1.008 Typ. 5.0 Max. 5.5 85 4.032 Units V C MHz
1998 MX-COM, Inc.
www.mxcom.com Tel: 800 638 5577 336 744 5050 Fax: 336 744 5054
Doc. # 20480081.010
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA
All trademarks and service marks are held by their respective companies.
1200/2400/4800bps MSK Modem
13
MX469
6.1.3 Operating Characteristics
For the following conditions unless otherwise specified. VDD = 5.0V @ TAMB = 25C Audio Level 0dB ref. = 300mVRMS, Xtal/Clock Frequency = 4.032MHz Signal-to-Noise Ratio measured in the Bit-Rate Bandwidth 1200bps BRB = 1200Hz 2400bps BRB = 2400Hz 4800bps BRB = 4800Hz Notes Static Values Supply Current RX Enabled, TX Disabled RX and TX Enabled RX and TX Disabled Logic `1` Level Logic `0' Level Digital Output Impedance Analog and Digital Input Impedance TX Output Impedance On-Chip Xtal Oscillator RIN ROUT Inverter DC Voltage Gain Gain Bandwidth Product Dynamic Values Receiver Signal Input Dynamic Range SNR = 50dB Bit Error Rate SNR = 12dB 1200bps 2400bps 4800bps SNR = 20dB 1200/2400/4800bps Receiver Synchronization Probability of Bit 8 Being Correct Probability of Bit 16 Being Correct Carrier Detect Sensitivity Probability of C.D. Being High After Bit 8 After Bit 16 0dB Noise (1200bps) SNR = 12dB SNR = 12dB No Signal 5, 9 5, 9 9 98 99.5 5 % % % 5, 10 7, 8 150 mVRMS SNR =12dB 7 99 99.5 % % 4 1.0 10-8 4 7.0 2.5 1.5 1.5 10-4 10-4 10-3 10-3 3, 4 100 230 1000 mVRMS 10.0 10.0 10.0 10.0 M k V/V MHz 100 0.6 1.0 1 1 4.0 4.0 1.0 3.6 4.5 650 mA mA A V V k k k Min. Typ. Max. Units
1998 MX-COM, Inc.
www.mxcom.com Tel: 800 638 5577 336 744 5050 Fax: 336 744 5054
Doc. # 20480081.010
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA
All trademarks and service marks are held by their respective companies.
1200/2400/4800bps MSK Modem
14
MX469
Notes Transmitter Output TX Output Level Output Level Variation 1200/1800Hz 1200/2400Hz 2400/4800Hz Output Distortion 3rd Harmonic Distortion Logic `1' Carrier Frequency 1200bps 2400bps 4800bps Logic `0' Carrier Frequency 1200bps 2400bps 4800bps Isochronous Distortion 1200Hz - 1800Hz/1200Hz 2400Hz 1800Hz - 1200Hz/2400Hz 1200Hz 2400Hz - 4800Hz/4800Hz 2400Hz Operating Characteristics Notes: 1. With reference to VDD = 5.0 volts. 6 6 6 6 6 6
Min.
Typ. 775
Max.
Units mVRMS
0 0 0 3.0 2.0 1200 1200 2400 1800 2400 4800 25.0 20.0 10.0
1.0 1.0 1.0 5.0 3.0
dB dB dB % % Hz Hz Hz Hz Hz Hz
40.0 40.0 20.0
s s s
2. Xtal frequency (ref. Clock Rate pin), type and tolerance depends upon system requirements. 3. See Figure 4 (variation of BER with Input Signal Level). 4. SNR = Signal-to-Noise in the Bit-Rate Bandwidth. 5. See Figure 2. 6. Dependent upon Xtal tolerance. 7. 10101010101 ...01 pattern. 8. Measured with a 150mVRMS input signal (no noise). 9. Reference (0dB) level for C.D. probability measurements is 230mVRMS. 10. For 1200bps and 2400bps operation only: when operating at 4800bps the carrier detect output should be ignored.
1998 MX-COM, Inc.
www.mxcom.com Tel: 800 638 5577 336 744 5050 Fax: 336 744 5054
Doc. # 20480081.010
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA
All trademarks and service marks are held by their respective companies.
1200/2400/4800bps MSK Modem
15
MX469
6.1.4 Packages
Figure 13: 24-pin SOIC Mechanical Outline: Order as part no. MX469DW
A
DIM. A B C E E1 H J J1 K L P T Y
Package Tolerances
MIN.
1.080 (27.43) 0.330 (8.38)
TYP.
MAX.
1.100 (27.94) 0.360 (9.14)
B
E1 Y
E
PIN 1
T
K H L J J1 P
C
0.185 (4.70) 0.420 (10.67) 0.480 (12.19) 0.390 (9.91) 0.420 (10.67) 0.020 (0.51) 0.045 (1.14) 0.015 (0.38) 0.020 (0.51) 0.065 (1.65) 0.040 (1.02) 0.066 (1.68) 0.128 (3.25)
0.100 (2.54) 0.010 (0.25) 7 NOTE : All dimensions in inches (mm.) Angles are in degrees
Figure 14: 22-pin PDIP Mechanical Outline: Order as part no. MX469P
1998 MX-COM, Inc.
www.mxcom.com Tel: 800 638 5577 336 744 5050 Fax: 336 744 5054
Doc. # 20480081.010
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA
All trademarks and service marks are held by their respective companies.
1200/2400/4800bps MSK Modem
16
MX469
Package Tolerances
A Z B E W L PIN 1 X Y C H J P K T
DIM. A B C E H J K L P T W X Y Z MIN. TYP . MAX.
0.510 (12.95) 0.495 (12.57) 0.299 (7.59) 0.286 (7.26) 0.093 (2.36) 0.105 (2.67) 0.419 (10.64) 0.390 (9.90) 0.003 (0.08) 0.020 (0.51) 0.013 (0.33) 0.020 (0.51) 0.046 (1.17) 0.036 (0.91) 0.050 (1.27) 0.016 (0.41) 0.050 (1.27) 0.009 (0.23) 0.0125 (0.32) 45 0 10 5 7 5 NOTE : All dimensions in inches (mm.) Angles are in degrees
ALTERNATIVE PIN LOCATION MARKING
Figure 15: 20-pin SOIC Mechanical Outline: Order as part no. MX469D3
1998 MX-COM, Inc.
www.mxcom.com Tel: 800 638 5577 336 744 5050 Fax: 336 744 5054
Doc. # 20480081.010
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA
All trademarks and service marks are held by their respective companies.
CML Microcircuits
COMMUNICATION SEMICONDUCTORS
CML Product Data
In the process of creating a more global image, the three standard product semiconductor companies of CML Microsystems Plc (Consumer Microcircuits Limited (UK), MX-COM, Inc (USA) and CML Microcircuits (Singapore) Pte Ltd) have undergone name changes and, whilst maintaining their separate new names (CML Microcircuits (UK) Ltd, CML Microcircuits (USA) Inc and CML Microcircuits (Singapore) Pte Ltd), now operate under the single title CML Microcircuits. These companies are all 100% owned operating companies of the CML Microsystems Plc Group and these changes are purely changes of name and do not change any underlying legal entities and hence will have no effect on any agreements or contacts currently in force. CML Microcircuits Product Prefix Codes Until the latter part of 1996, the differentiator between products manufactured and sold from MXCOM, Inc. and Consumer Microcircuits Limited were denoted by the prefixes MX and FX respectively. These products use the same silicon etc. and today still carry the same prefixes. In the latter part of 1996, both companies adopted the common prefix: CMX. This notification is relevant product information to which it is attached. CML Microcircuits (USA) [formerly MX-COM, Inc.] Product Textual Marking On CML Microcircuits (USA) products, the `MX-COM' textual logo is being replaced by a `CML' textual logo.
Company contact information is as below:
CML Microcircuits (UK)Ltd
COMMUNICATION SEMICONDUCTORS
CML Microcircuits (USA) Inc.
COMMUNICATION SEMICONDUCTORS
CML Microcircuits (Singapore)PteLtd
COMMUNICATION SEMICONDUCTORS
Oval Park, Langford, Maldon, Essex, CM9 6WG, England Tel: +44 (0)1621 875500 Fax: +44 (0)1621 875600 uk.sales@cmlmicro.com www.cmlmicro.com
4800 Bethania Station Road, Winston-Salem, NC 27105, USA Tel: +1 336 744 5050, 0800 638 5577 Fax: +1 336 744 5054 us.sales@cmlmicro.com www.cmlmicro.com
No 2 Kallang Pudding Road, 09-05/ 06 Mactech Industrial Building, Singapore 349307 Tel: +65 7450426 Fax: +65 7452917 sg.sales@cmlmicro.com www.cmlmicro.com
D/CML (D)/2 May 2002

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