Data Sheet
CME8000
RC Receiver IC
C-MAX
The RF Technology Specialist
1 Short Description
The CME8000 is a BiCMOS integrated straight through receiver with build in very high sensitivity
and a pre-decoding of the time signal transmitted from WWVB, DCF77, JJY, MSF and HBG. The
receiver is prepared for multi-mode reception by using an integrated logic. Integrated functions as
stand by mode, integrated antenna switching, integrated crystal switching and a 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 Build in pulse decoding for different protocols
o Switchable for 3 different frequencies
o High selectivity by using crystal filter
o Power down mode
o Only a few external components necessary
o AGC hold mode
o Wide frequency range (40 ... 120 kHz)
o Low power applications (1.2 .. 5.0 V)
o Automatic protocol recognition
o Pre-decoded protocol information
o Fast data transfer to CPU (100ms)
o Use of the CPU clock (32768Hz)
o Improved noise resistance
o Integrated AGC adaptation
Two built-in low impedance antenna switches
(40 Ohm/3V)
o True Bit strength indication
Benefits
o Extended Battery operating time
o Decoding of the signal extremely simplified
o Simplified micro controller software
o Simplified multi frequency handling
o Easy world time piece design
o Automatic country recognition
o True signal quality information
Block Diagram
QIN QLOUT QMOUT QHOUT
ANT1
cryst al switch
IN1
IN2
ANT2
AGC
GND
SPEC No.
CME8000
Revision
B.11
State
11.03.05
VCC
VL PON GNDL
Bias
rect.-
AGC
TCO
Logic
contr. unit
CLKS EL
CLOCK
I/O DR
Unit
DATA
DT
BS I1
BS I2
DEM PK
Figure 1.
SS1 SS2
HLD
C-MAX printed
14.03.2005
Version
English
Page
1 of 21
