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부품번호 CMX885 기능
기능 Marine VHF Audio and Signalling Processor
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CMX885 데이터시트, 핀배열, 회로
CML Microcircuits
COMMUNICATION SEMICONDUCTORS
CMX885
Marine VHF Audio and
Signalling Processor
D/885/3 December 2010
Audio and Signalling Processing, DTMF, DSC/ATIS and NOAA
with Auxiliary Functions for use in Marine VHF Systems
Features
Concurrent Audio/Signalling/Data Operations
Complete Audio-band Processing:
o Selectable Audio Processing Order
o Pre and De-emphasis
o Selectable 2.55/3.0 kHz Filtering
o Limiter
DSC/ATIS Modem for Marine Applications
Programmable Voice Scrambler
Inband Signalling: DTMF, NOAA NWR
C-BUS Serial Interface to Host µController
DTMF and Audio Tone Encoder/Decoder
Small VQFN and LQFP Packages
Dual Auxiliary ADC, 4 Multiplexed Inputs
4 x Auxiliary DACs
Dual Programmable System Clock Outputs
Tx Outputs for Single, Two-Point Modulation
3 x Analogue Inputs (Mic or Discriminator)
Digital Gain Adjustment
Default 3.6864MHz Xtal/Clock
Flexible Powersave Modes
Low-power 3.0V to 3.6V Operation
Audio Out
Mic Input
Auxiliary
Multiplexed
ADC Inputs
Host µC
IRQ
C-BUS
Reference Clock
3V to 3.6V Supply
System Clock 1
System Clock 2
CMX885
Marine VHF
Baseband Processor
Auxiliary
DACs
Modulator
Discriminator
Optional 2nd Receiver
Discriminator
Tx Enable
Rx Enable
RF
(Rx/Tx)
RF
(Rx)
1 Brief Description
The CMX885 is a half-duplex, audio, signalling and data processing IC for use in Marine VHF radio
systems.
Comprehensive audio processing facilities include complete audio processing, filtering, pre- or de-
emphasis and frequency inversion scrambling. Signal routing and filtering is included to assist host µC
based signal encoding/decoding applications.
1200bps Digital Selcall (DSC) or Automatic Transmitter Identification System (ATIS) modem with protocol
support and NWR decoding are supported.
A DTMF encoder/decoder, a full complement of auxiliary ADCs and DACs and dual synthesised clock
outputs are included in this low power PMR processor. The device also has flexible powersaving modes
and is available in 48-pin VQFN and LQFP packages.
© 2010 CML Microsystems Plc




CMX885 pdf, 반도체, 판매, 대치품
Marine VHF Audio and Signalling Processor
CMX885
Table 2 Xtal/clock Frequency Settings for Program Block 3 ........................................................ 14
Table 3 DTMF Tone Pairs............................................................................................................. 24
Table 4 Reset Operations ............................................................................................................. 35
Table 5 Voice Level Attenuation ................................................................................................... 49
Table 6 Program Block Selection.................................................................................................. 51
Table 7 RAMDAC Values ............................................................................................................. 54
Figure
Page
Figure 1 Block Diagram .................................................................................................................. 6
Figure 2 Recommended External Components ........................................................................... 10
Figure 3 Power Supply and De-coupling ...................................................................................... 12
Figure 4 C-BUS Transactions ....................................................................................................... 15
Figure 5 Signal Routing ................................................................................................................ 17
Figure 6 Rx 25kHz Channel Audio Filter Frequency Response................................................... 19
Figure 7 De-emphasis Curve for TIA/EIA-603 Compliance.......................................................... 19
Figure 8 Tx Channel Audio Filter Response and Template (ETSI) .............................................. 21
Figure 9 Tx Channel Audio Filter Response and Template (TIA) ................................................ 21
Figure 10 Audio Frequency Pre-emphasis ................................................................................... 22
Figure 11 DSC format ................................................................................................................... 24
Figure 12 DSC character format ................................................................................................... 25
Figure 13 Digital Clock Generation Schemes............................................................................... 31
Figure 14 Level Adjustments ........................................................................................................ 33
Figure 15 Limiter Values ............................................................................................................... 56
Figure 16 Default Tx Audio Filter Line-up ..................................................................................... 57
Figure 17 Default Rx Audio Filter Line-up..................................................................................... 57
Figure 18 Preferred Tx Audio Filter Line-up ................................................................................. 57
Figure 19 Preferred Rx Audio Filter Line-up ................................................................................. 57
Figure 20 C-BUS Timing............................................................................................................... 67
Figure 21 Mechanical Outline of 48-pin VQFN (Q3)..................................................................... 68
Figure 22 Mechanical Outline of 48-pin LQFP (L4) ...................................................................... 68
It is always recommended that you check for the latest product datasheet version from the CML website:
[www.cmlmicro.com].
© 2010 CML Microsystems Plc
4
D/885/3

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CMX885 전자부품, 판매, 대치품
Marine VHF Audio and Signalling Processor
3 Signal and Pin List
CMX885
48-pin
L4/Q3
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
Pin
Name
-
-
-
-
-
-
DVSS
IRQN
VDEC
RXENA
-
-
SYSCLK1
DVSS
TXENA
DISCN
DISCFB
ALTN
ALTFB
MICFB
MICN
AVSS
MOD1
MOD2
VBIAS
AUDIO
ADC1
ADC2
ADC3
Type
Description
NC reserved – leave unconnected
NC reserved – leave unconnected
NC reserved – leave unconnected
NC reserved – leave unconnected
NC reserved – leave unconnected
NC reserved – leave unconnected
PWR Digital Ground
C-BUS: A 'wire-ORable' output for connection to the Interrupt
OP
Request input of the host. Pulled down to DVSS when active
and is high impedance when inactive. An external pull-up
resistor (R1) is required.
Internally generated 2.5V digital supply voltage. Must be
PWR decoupled to DVSS by capacitors mounted close to the device
pins. No other connections allowed.
OP Rx Enable – active low when in Rx mode ($C1:b0 = 1)
NC reserved – leave unconnected
NC reserved – leave unconnected
OP Synthesised Digital System Clock Output 1
PWR Digital Ground
OP Tx Enable – active low when in Tx mode ($C1:b1 = 1)
IP Discriminator inverting input
OP Discriminator input amplifier feedback
IP ALT inverting input
OP ALT input amplifier feedback
OP MIC input amplifier feedback
IP MIC inverting input
PWR Analogue Ground
OP Modulator 1 output
OP Modulator 2 output
Internally generated bias voltage of about AVDD/2, except
when the device is in ‘Powersave’ mode when VBIAS will
OP discharge to AVSS. Must be decoupled to AVSS by a capacitor
mounted close to the device pins. No other connections
allowed.
OP Audio output
IP Auxiliary ADC input (1)
IP Auxiliary ADC input (2)
IP Auxiliary ADC input (3)
© 2010 CML Microsystems Plc
7
D/885/3

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CMX885

Marine VHF Audio and Signalling Processor

Consumer Microcircuits Limited
Consumer Microcircuits Limited

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