U4224B. Time Code Receiver. Description. Features. Block Diagram

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1 UB Time Code Receiver Description The UB is a bipolar integrated straight through receiver circuit in the frequency range of 0 to 0 khz. The device is designed for radio controlled clock applications. Features Very low power consumption Very high sensitivity High selectivity by using two crystal filters Power down mode available Only a few external components necessary Digitalized serial output signal AGC hold mode Block Diagram PON e FLB Power Supply Decoder 0 FLA 9 DEC IN AGC Amplifier Rectifier & Integrator SL SB QA QB QA QB REC INT Rev. A3, 0-Apr-96 (7)

2 UB Pin Description Pin Symbol Function SO 6 L Supply voltage IN 6 5 PON IN Amplifier Input 3 Ground SB Bandwidth control 5 QA Crystal filter 6 QB Crystal filter 7 REC Rectifier output SB QA QB UB 3 QB QA SL FLB INT Integrator output 9 DEC Decoder input 0 FLA Low pass filter REC INT 7 0 FLA 9 DEC FLB Low pass filter e SL AGC hold mode 3 QA Crystal filter QB Crystal filter 5 PON Power ON/OFF control 6 Time code output IN A ferrite antenna is connected between IN and. For high sensitivity the Q of the antenna circuit should be as high as possible, but a high Q often requires temperature compensation of the resonant frequency. Specifications are valid for Q > 30. An optimal signal to noise ratio will be achieved by a resonant resistance of 50 to 00 k. SB A resistor R SB is connected between SB and. It controls the bandwidth of the crystal filters. It is recommended: R SB = 0 for DCF 77.5 khz, R SB = 0 k for 60 khz WWVB and R SB = open for JGAS 0 khz. 9 3 SB IN (7) Rev. A3, 0-Apr-96

3 UB QA, QB In order to achieve a high selectivity, a crystal is connected between the pins QA and QB. It is used with the serial resonance frequency of the time code transmitter (e.g. 60 khz WWVB, 77.5 khz DCF or 0kHz JGAS). The equivalent parallel capacitor of the filter crystal is internally compensated. The compensated value is about 0.7 pf. If the full sensitivity and selectivity is not needed, the crystal filter can be substituted by a capacitor of 0 pf for DCF and WWVB and pf for JGAS. SL AGC hold mode: SL high (V SL = ) sets normal function, SL low (V SL = 0) disconnects the rectifier and holds the voltage V INT at the integrator output and also the AGC amplifier gain. SL QA QB 9 37 REC 9 3 Rectifier output and integrator input: The capacitor C between REC and INT is the lowpass filter of the rectifier and at the same time a damping element of the gain control INT Integrator output: The voltage V INT is the control voltage for the AGC. The capacitor C between INT and DEC defines the time constant of the integrator. The current through the capacitor is the input signal of the decoder REC INT DEC Decoder input: Senses the current through the integration capacitor C. The dynamic input resistance has a value of about 0k and is low compared to the impedance of C. FLA, FLB Lowpass filter: A capacitor C3 connected between FLA and FLB supresses higher frequencies at the trigger circuit of the decoder. DEC FLB FLB Rev. A3, 0-Apr-96 3 (7)

4 UB QA, QB According to QA, QB a crystal is connected between the pins QA and QB. It is used with the serial resonance frequency of the time code transmitter (e.g. 60 khz WWVB, 77.5 khz DCF or 0 khz JGAS). The equivalent parallel capacitor of the filter crystal is internally compensated. The value of the compensation is about 0.7 pf. PON QA QB 9 33 If PON is connected to, the U B receiver IC will be activated. The set-up time is typical 0.5s after applying at this pin. If PON is connected to, the receiver will go into power down mode. PON The digitized serial signal of the time code transmitter can be directly decoded by a microcomputer. Details about the time code format of several transmitters are described separately. The output consists of a PNPNPN push-pull-stage. It should be taken into account that in the power down mode (PON = high) will be high. An additional improvement of the driving capability may be achieved by using a CMOS driver circuit or a NPN transistor with pull-up resistor connected to the collector (see figure KEIN MERKER). Using a CMOS driver this circuit must be connected to. pin6 00 k Figure. 0 k e Please note: The signals and voltages at the pins REC, INT, FLA, FLB, QA, QB, QA and QB cannot be measured by standard measurement equipment due to very high internal impedances. For the same reason the PCB should be protected against surface humidity. Design Hints for the Ferrite Antenna The bar antenna is a very critical device of the complete clock receiver. But by observing some basic RF design knowledge, no problem should arise with this part. The IC requires a resonance resistance of 50 k to 00 k. This can be achieved by a variation of the L/C-relation in the antenna circuit. But it is not easy to measure such high resistances in the RF region. It is much more convenient to distinguish the bandwidth of the antenna circuit and afterwards to calculate the resonance resistance. Thus the first step in designing the antenna circuit is to measure the bandwidth. Figure 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 0: probe. The input capacitance of the probe, typically about 0 pf, should be taken into consideration. By varying the frequency of the signal generator, the resonance frequency can be determined. RF - Signal generator 77.5 khz Scope PON wire loop C res Probe 0 : 0 M e 9 30 (7) Rev. A3, 0-Apr-96

5 UB Afterwards, the two frequencies where the voltage of the rf signal at the probe drops 3 db down can 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 well known, it is easy to compute the resonance resistance according to the following formula: R res BW A C res whereas R res is the resonance resistance, BW A is the measured bandwidth (in Hz) C res is the value of the capacitor in the antenna circuit (in Farad) If high inductance values and low capacitor values are used, the additional parasitic capacitances of the coil must be considered. It may reach up to about 0 pf. The Q-value of the capacitor should be no problem if a high Q-type is used. The Q-value of the coil is more or less distinguished by the simple DC-resistance of the wire. Skin effects can be observed but do not dominate. Therefore it shouldn t be a problem to achieve the recommended values of resonance resistance. The use of thicker wire increases Q and accordingly reduces bandwidth. This is advantageous in order to improve reception in noisy areas. On the other hand, temperature compensation of the resonance frequency might become a problem if the bandwidth of the antenna circuit is low compared to the temperature variation of the resonance frequency. Of course, Q can also be reduced by a parallel resistor. Temperature compensation of the resonance frequency is a must if the clock is used at different temperatures. Please ask your dealer of bar antenna material and of capacitors for specified values of temperature coefficient. Furthermore some critical parasitics have to be considered. These are shortened loops (e.g. in the ground line of the PCB board) close to the antenna and undesired loops in the antenna circuit. Shortened loops decrease Q of the circuit. They have the same effect like conducting plates close to the antenna. To avoid undesired loops in the antenna circuit it is recommended to mount the capacitor C res as close as possible to the antenna coil or to use a twisted wire for the antenna coil connection. This twisted line is also necessary to reduce feedback of noise from the microprocessor to the IC input. Long connection lines must be shielded. A final adjustment of the time code receiver can be done by pushing the coil along the bar antenna. The maximum of the integrator output voltage V INT at pin INT indicates the resonant point. But attention: The load current should not exceed na, that means an input resistance G of the measuring device is required. Therefore a special DVM or an isolation amplifier is necessary. Absolute Maximum Ratings Parameters Symbol Value Unit Supply voltage 5.5 V Ambient temperature range T amb 5 to +75 C Storage temperature range R stg 0 to +5 C Junction temperature T j 5 C Electrostatic handling (MIL Standard 3 D), excepted pins 5, 6, 3 and ± V ESD 000 V Thermal Resistance Parameters Symbol Value Unit Thermal resistance R thja 70 K/W Rev. A3, 0-Apr-96 5 (7)

6 UB Electrical Characteristics = 3 V, reference point pin 3, input signal frequency 0 khz, T amb = 5 C, unless otherwise specified Parameters Test Conditions / Pin Symbol Min. Typ. Max. Unit Supply voltage range pin. 5.5 V Supply current pin I CC without reception signal with reception signal = 00V OFF-mode A A A Set-up time after ON =.5 V t s AGC AMPLIFIER INPUT; IN pin Reception frequency range f in 0 0 khz Minimum input voltage R res = 00 k, Q res > 30 V in.5 V Maximum input voltage V in 0 0 mv Input capacitance to ground C in.5 pf TIMING CODE OUTPUT; pin 6 Output voltage HIGH LOW Output current HIGH LOW Decoding characteristics R LOAD = 70 k to R LOAD = 650 k to V = / V = / DCF77 based on the values of the application circuit page KEIN MERKER: pulse width 00 pulse width 00 V OH -0. V OL I SOURCE 3 I SINK t 00 t V V Decoding characteristics Delay compared with the transient of the RF signal: drop down (start transition) rise for 00 pulse (end transition) rise for 00 pulse (end transition) WWVB based on the values of the application circuit page KEIN MERKER: pulse width 00 pulse width 500 pulse width 00 t s t e t e t 00 t 500 t Delay compared with the transient of the RF signal: drop down (start transition) rise (end transition) t s t e (7) Rev. A3, 0-Apr-96

7 UB Parameters Decoding characteristics Test Conditions / Pin JGAS based on the values of the application circuit page KEIN MERKER: pulse width 00 pulse width 500 pulse width 00 Symbol t 00 t 500 t 00 Min Typ. Max Unit Delay compared with the transient of the RF signal: start transition (RF on) end transition (RF off) t s t e POWER ON/OFF CONTROL; PON pin 5 Input voltage Required I IN 0.5 A HIGH -0. V LOW -. V Input current = 3V I IN..7 A =.5 V 0.7 A = 5 V 3 A Set-up time after PON t 0.5 s AGC HOLD MODE; SL pin Input voltage Required I IN 0.5 A HIGH -0. V LOW -. V Input current Vin = 0. A Vin =.5 A Rejection of interference signals 7f d f ud 7 = 65 Hz V d = 3 V, f d = 77.5 khz using crystal filters using crystal filter a f 3 a f db db Rev. A3, 0-Apr-96 7 (7)

8 UB Test Circuit (for Fundamental Function) Vd.657V 300k Ipon Test point: DVM with high and low input line for measuring of a voltage Vxx or a current lxx by conversion into a voltage. Stco Vtco Spon M p M Isl PON QB QA Ssl Ivcc 00k UB SL Sdec 0M STABILISATION DECODING FLB Iin FLA Idec M IN AGC- AMPLIFIER RECTIFIER DEC 00M Vdec SB QA QB REC INT 3 V ~ Vin Ssb p Vrec 60p 3.3 n Srec Sint 0k Vsb M 0M 0M Vint Isb Irec Vrec Iint Vint 9 3 e (7) Rev. A3, 0-Apr-96

9 Application Circuit for DCF 77.5 khz + CONTROL LINES UB Ferrite Antenna f res = 77.5 khz 77.5 khz ) C 6. nf UB khz 3 0 C 3 0 nf C 33 nf PON 3) SL ) MICROCOMPUTER DISPLAY KEYBOARD ) If SL is not used, SL is connected to ) 77.5 khz crystal can be replaced by 0 pf 3) If IC is activated, PON is connected to 9 79 e Application Circuit for WWVB 60 khz + CONTROL LINES Ferrite Antenna f res = 60 khz RSB 0 k 60 khz ) C 5 nf UB khz 3 0 C 3 0 nf C 7 nf PON 3) SL ) MICROCOMPUTER DISPLAY KEYBOARD ) If SL is not used, SL is connected to ) 60 khz crystal can be replaced by 0 pf 3) If IC is activated, PON is connected to 9 7 e Rev. A3, 0-Apr-96 9 (7)

10 UB Application Circuit for JGAS 0 khz + CONTROL LINES Ferrite Antenna f res = 0 khz 0 khz ) C 60 pf C M R 0 nf khz 3 UB 5 6 C nf 9 PON 3) SL ) MICROCOMPUTER DISPLAY KEYBOAR ) If SL is not used, SL is connected to ) 0 khz crystal can be replaced by pf 3) If IC is activated, PON is connected to 9 77 e 0 (7) Rev. A3, 0-Apr-96

11 UB PAD Coordinates The TB is the die version of the UB. DIE size:.6 x.09 mm PAD size: 00 x 00 m (contact window x m) Thickness: 300 m 0 m Symbol x-axis/m y-axis/m IN 75 IN SB 69 QA 00 QB 90 REC 5 INT 766 DEC 0 6 Symbol x-axis/m y-axis/m FLA FLB 0 0 SL 0 6 QA QB PON VCC 09 The PAD coordinates are referred to the left bottom point of the contact window. PAD Layout PON QB QA SL VCC TB FLB IN FLA y-axis IN DEC SB QA QB REC INT x-axis Reference point (0/0) 9 9 Rev. A3, 0-Apr-96 (7)

12 UB Information Regarding German Transmitter Station: DCF 77, Frequency 77.5 khz, Transmitting power 50 kw Location: Mainflingen/Germany, Geographical coordinates: N, E Time of transmission: permanent Time Frame Minute ( index count second ) Time Frame R A Z Z A S P 0 0 P P3 0 Example:9.35 h s coding when required minutes hours calendar day month day of the week P 0 0 P year sec minutes hours Start Bit Parity Bit P Parity Bit P Modulation: The carrier amplitude is reduced to 5 % at the beginning of each second for 00 (binary zero) or 00 (binary one) duration, excepting the 59th second. Time Code Format: (based on information of Deutsche Bundespost) It consists of minute time frames. No modulation at the beginning of the 59th second to recognize the switch over to the next minute time frame. A time frame contains BCD coded information of minutes, hours, calendar day, day of the week, month and year between the 0th second and 5th second of the time frame, including the start bit S (00 ) and parity bits P, P and P3. Further there are 5 additional bits R (transmission by reserve antenna), A (announcement of change over to the summer time), Z (during the summer time 00, otherwise 00 ), Z (during standard time 00 otherwise 00 ) and A (announcement of leap second) transmitted between the 5th second and 9th second of the time frame. (7) Rev. A3, 0-Apr-96

13 UB Information Regarding British Transmitter Station: MSF Frequency 60 khz Transmitting power 50 kw Location: Teddington, Middlesex Geographical coordinates: 5 N, 0 W Time of transmission: permanent, excepting the first tuesday of each month from 0.00 h to.00 h. TIME FRAME MINUTE ( index count second) TIME FRAME switch over to the next time frame 0 year month day of month day of week hour minute minute identifier Parity BST check bits hour + minute day of week day + month year BST 7 GMT change impending Example: March 993 seconds year month Modulation: The carrier amplitude is switched off at the beginning of each second for the time of 00 (binary zero) or 00 (binary one). Time Code Format: It consists of minute time frames. A time frame contains BCD coded information of year, month, calendar day, day of the week, hours and minutes. At the switch over to the next time frame, the carrier amplitude is reduced for 500 duration. The prescence of the fast code during the first 500 at the beginning of the minute in not guaranteed. The transmission rate is 00 bits/s and the code contains information of hour, minute, day and month. Rev. A3, 0-Apr-96 3 (7)

14 UB Information Regarding US Transmitter Station: WWVB Frequency 60 khz Transmitting power 0 kw Location: Fort Collins Geographical coordinates: 0 0 N, W Time of transmission: permanent. TIME FRAME MINUTE TIME FRAME ( index count second) P0 FRM P 0 0 P P3 ADD SUB ADD P P5 P0 minutes hours days UTI sign UTI correction year daylight savings time bits leap second warning bit leap year indicator bit 0 = non leap year = leap year Example: UTC. h TIME FRAME e P P 0 0 P seconds minutes hours Frame reference marker Modulation: The carrier amplitude is reduced 0 db at the beginning of each second and is restored in 500 (binary one) or in 00 (binary zero). Time Code Format: It consists of minute time frames. A time frame contains BCD coded information of minutes, hours, days and year. In addition there are 6 position identifier markers (P0 thru P5) and frame reference marker with reduced carrier amplitude of 00 duration. (7) Rev. A3, 0-Apr-96

15 Information Regarding Japanese Transmitter Station: JGAS Frequency 0 khz Transmitting power 0 kw UB Location: Sanwa, Ibaraki Geographical coordinates: 36 N, 39 5 E Time of transmission: permanent Time Frame Minute (index count second) Time Frame PO FRM P 0 0 P P3 ADD SUB ADD P P5 P0 minutes hours days code dut Example:. h Time Frame P P 0 0 P sec minutes hours frame reference marker (FRM) position identifier marker P0 position identifier marker P 0. s 0. s 0.5 s 0 P 0.5 second: Binary one 0. second: Binary zero 0. second: Identifier markers P0...P e Modulation: The carrier amplitude is 00% at the beginning of each second and is switched off after 500 (binary one) or after 00 (binary zero). Time Code Format: It consists of one minute time frame. A time frame contains BCD coded information of minutes, hours and days. In addition there are 6 position identifier markers (P0 thrup5) and one frame reference markers (FRM) with reduced carrier amplitude of 00 duration. Ordering and Package Information Extended type number Package Remarks UB-CFL SO 6 L plastic UB-CFLG3 SO 6 L plastic Taping according to IEC 6 3 TB-CF no die on foil TB-CC no die on tray Rev. A3, 0-Apr-96 5 (7)

16 UB Dimensions in mm Package: SO 6 L (7) Rev. A3, 0-Apr-96

17 UB Ozone Depleting Substances Policy Statement It is the policy of TEMIC TELEFUNKEN microelectronic GmbH to. Meet all present and future national and international statutory requirements.. Regularly and continuously improve the performance of our products, processes, distribution and operating syste with respect to their impact on the health and safety of our employees and the public, as well as their impact on the environment. It is particular concern to control or eliminate releases of those substances into the atmosphere which are known as ozone depleting substances (ODSs). The Montreal Protocol (97) and its London Amendments (990) intend to severely restrict the use of ODSs and forbid their use within the next ten years. Various national and international initiatives are pressing for an earlier ban on these substances. TEMIC TELEFUNKEN microelectronic GmbH semiconductor division has been able to use its policy of continuous improvements to eliminate the use of ODSs listed in the following documents.. Annex A, B and list of transitional substances of the Montreal Protocol and the London Amendments respectively. Class I and II ozone depleting substances in the Clean Air Act Amendments of 990 by the Environmental Protection Agency (EPA) in the USA 3. Council Decision /50/EEC and 9/690/EEC Annex A, B and C (transitional substances) respectively. TEMIC can certify that our semiconductors are not manufactured with ozone depleting substances and do not contain such substances. We reserve the right to make changes to improve technical design and may do so without further notice. Parameters can vary in different applications. All operating parameters must be validated for each customer application by the customer. Should the buyer use TEMIC products for any unintended or unauthorized application, the buyer shall indemnify TEMIC against all clai, costs, damages, and expenses, arising out of, directly or indirectly, any claim of personal damage, injury or death associated with such unintended or unauthorized use. TEMIC TELEFUNKEN microelectronic GmbH, P.O.B. 3535, D-705 Heilbronn, Germany Telephone: 9 (0) , Fax number: 9 (0) Rev. A3, 0-Apr-96 7 (7)

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