CME8000-DB C-Max, CME8000-DB Datasheet - Page 4

• Manufacturer Part Number: CME8000-DB
• Description: BOARD DEMO FOR CME8000
• Manufacturer: C-Max

Specifications of CME8000-DB

• Module/board Type: Demonstration Board
• For Use With/related Products: CME8000
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: 561-1006

C-MAX
IN1, IN2
A ferrite antenna is connected between IN1 and
IN2. For high sensitivity, the Q factor of the
antenna circuit should be as high as possible.
Please note that a high Q factor requires
temperature
frequency in most cases. We recommend a Q
factor between 40 and 150, depending on the
application. An optimal signal-to-noise ratio will be
achieved by a resonator resistance of 40 kOhm to
100 kOhm.
ANT1, ANT2
To realize a reception at different frequencies with
one antenna, it is possible to connect additional
capacitors between the inputs. An internal MOS-
switch is closed when a 60kHz protocol is
activated. A second internal switch is closed
choosing the JJY40 protocol (see table page 9).
The capacitors have to be connected between
ANT2 and IN1 for adjusting the 60kHz frequency,
and between ANT1 and IN2 to adjust the
frequency to 40kHz. Note in this case both
switches are closed.
In applications with supply voltages below 2.5V
the impedance of the switches is probably too
high for a good Q-factor.
In applications with less than 3 frequencies leave
the unused pins open
QHOUT, QMOUT, QLOUT
Pad 5
Pin 5
Pad 4
Pin 4
Pad 3
Pin 3
Pad 2
Pin 2
Pad 1
Pin 1
Pad 9
Pin 9
ANT1
ANT2
VCC
GND
IN1
IN2
CME8000
SPEC No.
Time Solutions
compensation
200k
Figure 4.
Revision
B.15
200k
of
09.03.07
the
State
RF - AMP
resonant
from
AGC
03.05.2007
C-MAX printed
In order to achieve a high selectivity, a crystal is
connected between the Pins QOUT and QIN. It is
used with the serial resonant frequency according
to the time-code transmitter and acts as a serial
resonator. Up to 3 crystals could be connected
from QLOUT, QMOUT and QHOUT to the
common
automatically selected by the pin SS1 and SS2
(see table). Only one of the outputs is active. Note
that the output QLOUT is active if JJY40 is
selected. QMOUT is active if a 60kHz protocol is
selected, and QHOUT is only active for DCF or
HBG.
In
frequencies, leave the unused output pins open.
The given parallel capacitor of the filter crystal
(about 1.4 pF) is internally compensated so that
the bandwidth of the filter is about 10 Hz. The
impedance of QIN is high. Parasitic loads have to
be avoided.
QIN
DEM
Pad 5
Pin 5
Pad 10
Pin 10
Pad 9
Pin 9
QHOUT
QMOUT
QLOUT
VCC
GND
QIN
applications
Pad 5
Pin 5
Pad 9
Pin 9
VCC
GND
Q
PIN6
PIN7
PIN8
input
1 k
Pad6
Pad7
Pad8
200k
Figure 6.
QIN.
with
English
Data Sheet
Version
110k
Figure 5.
less
The
than
outputs
CME8000
3
4 of 22
110k
Page
will
different
be