Preliminary
Data Sheet
CME6005
RC Receiver IC
C-MAX
RF Technology Specialist
CME6005
Single and dual band receiver IC
1 Short Description
The CME6005 is a BiCMOS integrated straight
through receiver with build in very high
sensitivity for the time signal transmitted from
WWVB, DCF77, JJY, MSF and HBG. The
receiver is prepared for single-and dual band
(by using additional capacitor matching pin)
reception. Integrated functions as stand by
mode, complementary output stages and hold
mode function offer features for universal
applications. The power down mode increases
the battery lifetime significantly and makes the
device ideal for all kinds of radio controlled
time pieces.
2 Features
o
Low power consumption (<100µA)
o
Very high sensitivity (0.4µV)
o
Dedicated input for external crystal
capacitance matching for dual band
application
o
High selectivity by using crystal filter
o
Power down mode
o
o
o
o
o
o
Only a few external components necessary
AGC hold mode
Wide frequency range (40 ... 120 kHz)
Low power applications (1.2 .. 5.0 V)
Improved noise resistance
Integrated AGC adaptation
Benefits
o
Dual band application
o
Existing software can be used
o
Extended battery operating time
QOUT QC QIN
DEM
Block Diagram
TCO
IN 2
IN 1
+
-
TCON
AGC
PEAK
DET.
BIAS
PON
VCC
GND
Figure 1. Block diagram
PK
HLD
SPEC No.
Revision
State
C-MAX printed
Version
Page
CME6005
A7
07.12.04
07.12.2004
English
1 of 15
Preliminary
Data Sheet
CME6005
C-MAX
3 Ordering Information
Extended Type Number
Package
Remarks
CME6005-DDT
no
die in trays
CME6005-TCSH
yes
SSO16
CME6005-TCQH
Yes
SSO16 Taped and reeled
*The packaged version of CME6005 complies with lead free JEDEC standard J-STD 020B.
4 Absolute Maximum Ratings
Parameters
Supply voltage
Ambient temperature range
Storage temperature range
Junction temperature
Electrostatic handling (MIL Standard 883 D HBM)
Electrostatic handling (MIL MM)
Symbol
VCC
T
amb
R
stg
T
j
+/- V
ESD
+/- V
ESD
Value
5.5
-40 to +85
-55 to +150
125
+/-4000
+/-400
Unit
V
°C
°C
°C
V
V
5 PAD Coordinates
The CME6005 is available as die for "chip-on-board" mounting and in SSO16 package.
DIE size:
1,42mm x 1,63 mm
PAD size:
100 x 100 µm (contact window 84µm / 84µm)
Thickness:
300µm±10µm
Symbol
QIN
GND
QOUT
VCC
IN2
IN1
TCON
TCO
PON
PK
HLD
DEM
QC
Function
Crystal Input
Ground
Crystal output
Supply voltage
Antenna input 2
Antenna input 1
Negative signal output
Positive signal output
Power ON input
Capacity for AGC
AGC hold
Demodulator output
Crystal matching Cap
x-axis (µm)
118,5
118,5
118,5
118,5
118,5
118,5
1039,5
1167,8
1167,8
1167,8
1167,8
1167,8
118,5
y-axis (µm)
1138,2
969,6
803,3
464,8
304,8
99,6
87,6
471,3
738,4
924,3
1141,5
1326,4
1319,1
Pad # (dice)
1
2
3
4
5
6
7
8
9
10
11
12
13
Pin #
(SSO16*)
2
3
4
5
6
7
10
11
12
13
14
15
1
Coordinate requirements should be achieved
SPEC No.
Revision
State
C-MAX printed
Version
Page
CME6005
A.7
07.12.04
07.12.2004
English
2 of 16
Preliminary
Data Sheet
CME6005
C-MAX
6- Pad Layout
Pin Layout SSO16
QC
1
QC
QIN
GND
QOUT
13
1
2
3
12
11
10
9
8
DEM
QIN
2
HLD
PK
QOUT
4
PON
TCO
Th e PA D co or d in a te s
are referred to the left
bottom point of the contact
window
VCC
5
IN 2
6
IN 1
7
NC
8
X-axis
Reference point (%)
16
NC
15
DEM
14
HLD
GND
3
CME6005
FB
13
PK
12
PON
11
TCO
10
TCON
9
NC
VCC
IN 2
IN 1
Y-axis
4
5
6
7
TCON
Figure 2. Pad layout
Figure 3. Pin layout SSO16
PIN Description
IN1, IN2
A ferrite antenna is connected between IN 1 and IN 2. 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 kΩ to 100 kΩ.
QOUT, QIN , QC
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 2
crystals can be connected parallel between QOUT and QIN. For one crystal, 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.
For two crystals, an additional external capacitor with the value of about 1.4 pF has to be connected parallel
between QC and QIN. The impedance of QIN is high. Parasitic loads have to be avoided.
DEM
Demodulator output. To ensure the function, an external capacitor has to be connected at this output.
HLD
AGC hold mode: HLD high (V
HLD
= V
CC
) sets normal function, HLD low (V
HLD
= 0) holds for a short time the
AGC voltage. This can be used to prevent the AGC from peak voltages, created by e.g. a stepper motor
PK
Peak detector output. An external capacitor has to be connected to ensure the function of the AGC
regulation. The value of the capacitance influences the AGC regulation time.
NOTE:
To realize a good regulation timing of the demodulator and the peak detector the value of the
capacitors at DEM and PK have to be changed for the different protocols.
SPEC No.
Revision
State
C-MAX printed
Version
Page
CME6005
A.7
07.12.04
07.12.2004
English
3 of 16
Preliminary
Data Sheet
VCC, GND
CME6005
C-MAX
V
CC
and GND are the supply voltage inputs. The positive supplies have to be connected externally, and also
the ground pins.
To power down the circuitry it is recommended to use the PON input and not to switch the power supply.
Switching the power supply results in a long power up waiting time.
PON
If PON is connected to GND, the receiver will be activated. The setup time is typically 0.5 sec after applying
GND to this pin. If PON is connected to VCC, the receiver will switch to Power Down mode.
TCO, TCON
The serial signal of the time-code transmitter can be directly decoded by a micro controller. Details about the
time-code format of several transmitters are described separately. If TCO is connected, TCON must be open
or counterwise.
SPEC No.
Revision
State
C-MAX printed
Version
Page
CME6005
A.7
07.12.04
07.12.2004
English
4 of 16
Preliminary
Data Sheet
CME6005
C-MAX
7 Design Hints for the Ferrite Antenna
7.1 Dimensioning of antenna circuit for different clock/watch applications
The bar antenna is a very critical device of the complete clock receiver. Observing some basic RF design
rules helps to avoid possible problems. The IC requires a resonant resistance of 40 kΩ to 100 kΩ. This can
be achieved by a variation of the L/C-relation in the antenna circuit. In order to achieve this resonant
resistance, we recommend to use antenna capacitors of a value between 2.2nF and 6.8nF. The optimum
value of the capacitor has to be specified respecting the concrete application needs and different boundary
conditions(ferrite material, type of antenna wire, available space for antenna coil).It is not easy to measure
such high resistances in the RF region. A more convenient way is to distinguish between the different
bandwidths of the antenna circuit and to calculate the resonant resistance afterwards.
Thus, the first step in designing the antenna circuit is to measure the bandwidth. Figure 12 shows an
example for the test circuit. The RF signal is coupled into the bar antenna by inductive means, e.g., a wire
loop. It can be measured by a simple oscilloscope using the 10:1 probe. The input capacitance of the probe,
typically about 10 pF, should be taken into consideration. By varying the frequency of the time signal
generator, the resonant frequency can be determined.
Time signal
generator
Scope
Probe
10:1
Wire loop
C
res
Figure 12.
At the point where the voltage of the RF signal at the probe drops by 3 dB, the two frequencies can then be
measured. The difference between these two frequencies is called the bandwidth BW
A
of the antenna circuit.
As the value of the capacitor C
res
in the antenna circuit is known, it is easy to compute the resonant
resistance according to the following formula:
1
R
res
=2 x
π
X BW X C
A
res
Where
R
res
is the resonant resistance,
BW
A
is the measured bandwidth
C
res
is the value of the capacitor in the antenna circuit (Farad).
If high inductance values and low capacitor values are used, the additional parasitic capacitance of the coil
must be considered. The Q value of the capacitor should be no problem if a high Q type is used. The Q
value of the coil differs more or less from the DC resistance of the wire. Skin effects can be observed but do
not dominate.
Therefore, it should not be a problem to achieve the recommended values of the resonant resistance. The
use of thicker wire increases the Q value and accordingly reduces bandwidth. This is advantageous in order
to improve reception in noisy areas. On the other hand temperature compensation of the resonant frequency
might become a problem if the bandwidth of the antenna circuit is low compared to the temperature variation
of the resonant frequency. Of course, the Q value can also be reduced by a parallel resistor.
Temperature compensation of the resonant frequency is a must if the clock is used at different temperatures.
Please ask your supplier of bar antenna material and of capacitors for specified values of the temperature
coefficient.
SPEC No.
Revision
State
C-MAX printed
Version
Page
CME6005
A.7
07.12.04
07.12.2004
English
5 of 16
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