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| 型号： | CME8000-DDTB |
| 厂商： | C-Max |
| 文件页数： | 4/22页 |
| 文件大小： | 0K |
| 描述： | IC RECEIVER RC BICMOS DIE |
| 标准包装： | 1,000 |
| 功能： | 接收器 |
C-MAX Time Solutions
Data Sheet
CME8000
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 compensation of the resonant
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 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 input QIN. The outputs will be
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 applications with less than 3 different
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.
VCC
Pad 5
Pin 5
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
Q
110k
110k
the unused pins open
QHOUT PIN6
QMOUT PIN7
Pad6
Pad7
QLOUT
PIN8
Pad8
VCC
Pad 5
Pin 5
GND
ANT1
Pad 4
Pin 4
200k
200k
RF - AMP
Pad 9
Pin 9
Figure 5.
QIN
IN1
VCC
Pad 3
Pin 3
IN2
Pad 2
Pin 2
Pad 5
Pin 5
200k
ANT2
Pad 1
from
AGC
QIN
Pin 1
GND
Pad 9
Pin 9
Figure 4.
Pad 10
Pin 10
GND
Pad 9
Pin 9
1k
Figure 6.
QHOUT, QMOUT, QLOUT
DEM
SPEC No.
CME8000
Revision
B.15
State
09.03.07
C-MAX printed
03.05.2007
Version
English
Page
4 of 22
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