CMX7031 Datasheet, PDF (61/82 Pages) CML Microcircuits – Full Audio-band Processing

The Two-Way Radio Processor
CMX7031/CMX7041
7.17.
Digital System Clock Generators
to RF Synthesiser
Ref CLK selection
LPF
VCO
Ref CLK div
/1 to 512
$AC b0-8
PD
SYSCLK1
SYSCLK1
Ref _{48 - 192kHz} Div
(96kHz typ)
PLL div
/1 to 1024
$AB b0-9
LPF
Ref CLK div
/1 to 512
$AE b0-8
PD
SYSCLK2
SYSCLK2
Ref _{48 - 192kHz} Div
(96kHz typ)
PLL div
/1 to 1024
$AD b0-9
VCO
LPF
Ref CLK div
/1 to 512
P3.4
PD
MainCLK
MainCLK
Ref _{48 - 192kHz} Div
(96kHz typ)
PLL div
/1 to 1024
P3.5
VCO
OSC
3.0 - 12.288MHz Xtal
or
3.0 - 24.576MHZ Clock
SYSCLK1 VCO
24.576-
98.304MHz
(49.152MHz typ)
SYSCLK1
Pre-CLK
$AC b11-15
VCO op div
/1 to 64
$AB b10-15
SYSCLK1
Output
384kHz-20MHz
SYSCLK2 VCO
24.576-
98.304MHz
(49.152MHz typ)
SYSCLK2
Pre-CLK
$AE b11-15
VCO op div
/1 to 64
$AD b10-15
SYSCLK2
Output
384kHz-20MHz
MainCLK VCO
24.576-
98.304MHz
(49.152MHz typ)
MainCLK
Pre-CLK
VCO op div
/1 to 64
P3.3 b12-7
P3.6 b12-7
MainCLK
Output
384kHz-50MHz
(24.576MHz typ)
AuxADC
Div
P3.3 b6-0
P3.6 b6-0
To Internal
ADC / DAC
dividers
Aux_ADC
(83.3kHz typ)
Figure 26 Digital Clock Generation Schemes
The CMX7031/CMX7041 includes a 2-pin crystal oscillator circuit. This can either be configured as an
oscillator, as shown in section 5, or the XTAL input can be driven by an externally generated clock. The
crystal (Xtal) source frequency can go up to 12.288MHz (clock source frequency up to 24.576MHz), but a
6.144MHz Xtal is assumed for the functionality provided in the CMX7031/CMX7041.
 2013 CML Microsystems Plc
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