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U4224B
Time Code Receiver
Description
The U4224B is a bipolar integrated straight through receiver circuit in the frequency range of 40 to 80 kHz. The device is designed for radio controlled clock applications.
Features
D D D D
Very low power consumption Very high sensitivity High selectivity by using two crystal filters Power down mode available
D Only a few external components necessary D Digitalized serial output signal D AGC hold mode
Block Diagram
PON GND VCC 3 1 15 Power Supply TCO 16 Decoder
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11 10 9
FLB FLA DEC
IN
2 4 SB Q1A
AGC Amplifier 5 6 13 14 Q2B
Rectifier & Integrator 7 REC 8 INT
12
SL
Q1B Q2A
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U4224B
Pin Description
Pin SO 16 L 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 VCC IN GND SB Q1A Q1B REC INT DEC FLA FLB SL Q2A Q2B PON TCO Supply voltage Amplifier - Input Ground Bandwidth control Crystal filter 1 Crystal filter 1 Rectifier output Integrator output Decoder input Low pass filter Low pass filter AGC hold mode Crystal filter 2 Crystal filter 2 Power ON/OFF control Time code output INT 8
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Symbol
Function
VCC
1
16 TCO 15 PON 14 Q2B 13 Q2A U4224B 12 SL 11 FLB 10 FLA 9 DEC
IN 2 GND 3 SB 4
Q1A 5 Q1B 6 REC 7
IN
A ferrite antenna is connected between IN and VCC. 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 200 kW.
SB
A resistor RSB is connected between SB and GND. It controls the bandwidth of the crystal filters. It is recommended: RSB = 0 W for DCF 77.5 kHz, RSB = 10 kW for 60 kHz WWVB and RSB = open for JG2AS 40 kHz.
94 8381
VCC
SB IN GND
94 8379
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U4224B
Q1A, Q1B
In order to achieve a high selectivity, a crystal is connected between the pins Q1A and Q1B. It is used with the serial resonance frequency of the time code transmitter (e.g. 60 kHz WWVB, 77.5 kHz DCF or 40kHz JG2AS). 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 10 pF for DCF and WWVB and 22 pF for JG2AS.
SL
AGC hold mode: SL high (VSL = VCC) sets normal function, SL low (VSL = 0) disconnects the rectifier and holds the voltage VINT at the integrator output and also the AGC amplifier gain.
VCC
SL
94 8378
Q1A
Q1B GND
94 8382
INT
Integrator output: The voltage VINT is the control voltage for the AGC. The capacitor C2 between INT and DEC defines the time constant of the integrator. The current through the capacitor is the input signal of the decoder.
94 8375 94 8374
REC
Rectifier output and integrator input: The capacitor C1 between REC and INT is the lowpass filter of the rectifier and at the same time a damping element of the gain control.
INT REC GND GND
DEC
Decoder input: Senses the current through the integration capacitor C2. The dynamic input resistance has a value of about 420kW and is low compared to the impedance of C2.
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
94 8376
GND
94 8377
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U4224B
Q2A, Q2B
According to Q1A, Q1B a crystal is connected between the pins Q2A and Q2B. It is used with the serial resonance frequency of the time code transmitter (e.g. 60 kHz WWVB, 77.5 kHz DCF or 40 kHz JG2AS). The equivalent parallel capacitor of the filter crystal is internally compensated. The value of the compensation is about 0.7 pF. 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 VCC. VCC 10 kW 100 kW TCO pin16 TCO Q2A Q2B
Figure 1.
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GND Please note: The signals and voltages at the pins REC, INT, FLA, FLB, Q1A, Q1B, Q2A and Q2B 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.
PON
If PON is connected to GND, the U 4224 B receiver IC will be activated. The set-up time is typical 0.5s after applying GND at this pin. If PON is connected to VCC, the receiver will go into power down mode. VCC
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 kW to 200 kW. 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 4 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 signal generator, the resonance frequency can be determined.
PON
94 8373
TCO
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 PNP*NPN push-pull-stage. It should be taken into account that in the power down mode (PON = high) TCO will be high. VCC PON TCO
RF - Signal generator 77.5 kHz
Scope
w10
wire loop Cres
Probe 10 : 1 MW
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GND TELEFUNKEN Semiconductors Rev. A3, 02-Apr-96
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U4224B
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 BWA of the antenna circuit. As the value of the capacitor Cres in the antenna circuit is well known, it is easy to compute the resonance resistance according to the following formula: R res 1 + 2 @ p @ BW @ C
A res
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 Cres 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 VINT at pin INT indicates the resonant point. But attention: The load current should not exceed 1 nA, that means an input resistance 1 GW of the measuring device is required. Therefore a special DVM or an isolation amplifier is necessary.
whereas Rres is the resonance resistance, BWA is the measured bandwidth (in Hz) Cres 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 20 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
w
Absolute Maximum Ratings
Parameters Supply voltage Ambient temperature range Storage temperature range Junction temperature Electrostatic handling ( MIL Standard 883 D ), excepted pins 5, 6, 13 and 14 Symbol VCC Tamb Rstg Tj VESD Value 5.25 -25 to +75 -40 to +85 125 2000 Unit V _C _C _C V
Thermal Resistance
Parameters Thermal resistance Symbol RthJA Value 70 Unit K/W
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U4224B
Electrical Characteristics
VCC = 3 V, reference point pin 3, input signal frequency 80 kHz, Tamb = 25 _C, unless otherwise specified Test Conditions / Pin pin 1 pin 1 without reception signal with reception signal = 200mV OFF-mode Set-up time after VCC ON VCC = 1.5 V AGC AMPLIFIER INPUT; IN pin 2 Reception frequency range Minimum input voltage Rres = 100 kW, Qres > 30 Maximum input voltage Input capacitance to ground TIMING CODE OUTPUT; TCO pin 16 Output voltage HIGH RLOAD = 870 kW to GND LOW RLOAD = 650 kW to VCC Output current HIGH VTCO = VCC/2 LOW VTCO = VCC/2 Decoding characteristics DCF77 based on the values of the application circuit page KEIN MERKER: TCO pulse width 100 ms TCO pulse width 200 ms Delay compared with the transient of the RF signal: drop down (start transition) rise for 100 ms pulse (end transition) rise for 200 ms pulse (end transition) WWVB based on the values of the application circuit page KEIN MERKER: TCO pulse width 200 ms TCO pulse width 500 ms TCO pulse width 800 ms Delay compared with the transient of the RF signal: drop down (start transition) rise (end transition) ts te 45 20 80 45 ms ms ts te1 te2 30 25 10 60 55 30 ms ms ms Parameters Supply voltage range Supply current Symbol VCC ICC Min. 1.2 Typ. Max. 5.25 30 25 0.1 Unit V
15 t fin Vin Vin Cin 40 40 1 80 1.5 2
mA mA mA
s kHz
80 1.5
mV
mV pF
VOH VOL ISOURCE ISINK t100 t200
VCC - 0.4 0.4 3 4 10 12
V V
mA mA
130 230 ms ms
60 160
90 190
Decoding characteristics
t200 t500 t800
140 440 740
200 500 800
ms ms ms
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U4224B
Parameters Decoding characteristics Test Conditions / Pin JG2AS based on the values of the application circuit page KEIN MERKER: TCO pulse width 200 ms TCO pulse width 500 ms TCO pulse width 800 ms Delay compared with the transient of the RF signal: start transition (RF on) end transition (RF off) POWER ON/OFF CONTROL; PON pin 15 Input voltage Required IIN 0.5 mA HIGH LOW Input current VCC = 3V VCC = 1.5 V VCC = 5 V Set-up time after PON AGC HOLD MODE; SL pin 12 Input voltage Required IIN 0.5 mA HIGH LOW Input current Vin = VCC Vin = GND Rejection of interference fd - fud = 625 Hz signals Vd = 3 mV, fd = 77.5 kHz using 2 crystal filters using 1 crystal filter ts te 10 30 110 220 ms ms Symbol Min. Typ. Max. Unit
t200 t500 t800
240 420 720
410 490 790
ms ms ms
y
VCC - 0.2 IIN t 1.4 1.7 0.7 3 0.5 VCC - 1.2 2
V V
mA mA mA
s
2
y
VCC - 0.2 VCC - 1.2 0.1 2.5
V V
mA mA
dB dB
af af
43 22
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U4224B
Test Circuit (for Fundamental Function)
Vd 1.657V Ipon 300k Stco Vtco
TCO PON Q2B Test point: DVM with high and low input line for measuring of a voltage Vxx or a current lxx by conversion into a voltage.
Spon
1M 82p
Q2A
1M Isl Ssl
SL
U4224B
Ivcc 100k
VCC
10M Sdec
STABILISATION
DECODING
FLB
Iin
FLA
Idec 100M
1M
AGCAMPLIFIER
IN GND SB Q1A Q1B
RECTIFIER
DEC REC INT
Vdec
VCC 3V
~ Vin Ssb Vrec
82p
680p 3.3 n Srec Sint 10M Vrec
420k
Vsb
1M
10M
Vint Vint
Isb Irec Iint
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U4224B
Application Circuit for DCF 77.5 kHz
+ VCC
CONTROL LINES
Ferrite Antenna fres = 77.5 kHz
1 2 3 4
16 15 14 77.5 kHz 13 TCO PON 3) MICROCOMPUTER SL
1)
KEYBOARD
U4224B
5 77.5 kHz
2)
12
DISPLAY
6 11 10 9 7 8 C3 10 nF C2 33 nF
94 8279 e
C1 6.8 nF
1) 2) 3)
If SL is not used, SL is connected to VCC 77.5 kHz crystal can be replaced by 10 pF If IC is activated, PON is connected to GND
Application Circuit for WWVB 60 kHz
+ VCC
CONTROL LINES
Ferrite Antenna fres = 60 kHz
1 2 3 RSB 4 10 kW 5
16 15 14 60 kHz 13 TCO PON 3) SL
1)
MICROCOMPUTER
KEYBOARD
U4224B
12
60 kHz
2)
DISPLAY
6 11 10 9 C3 10 nF C2 47 nF
94 8278 e
C1 15 nF
7 8
1) If SL is not used, SL is connected to V CC 2) 60 kHz crystal can be replaced by 10 pF 3) If IC is activated, PON is connected to GND
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U4224B
Application Circuit for JG2AS 40 kHz
+ VCC
CONTROL LINES
Ferrite Antenna fres = 40 kHz
1 2 3 4
16 15 14 40 kHz 13 TCO PON 3) SL
1)
MICROCOMPUTER
KEYBOAR
U4224B
5 40 kHz
2)
12
DISPLAY
6 11 10 9 C3 10 nF
1) 2) 3)
C1 680 pF C2 220 nF 1 MW R
7 8
If SL is not used, SL is connected to VCC 40 kHz crystal can be replaced by 22 pF If IC is activated, PON is connected to GND
94 7724 e
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U4224B
PAD Coordinates
The T4224B is the die version of the U4224B. DIE size: PAD size: Thickness: Symbol IN1 IN GND SB Q1A Q1B REC INT DEC 2.26 x 2.09 mm 100 x 100 mm (contact window 88 x 88 mm) 300 mm 20 mm
"
x-axis/mm 128 128 354 698 1040 1290 1528 1766 2044
y-axis/mm 758 310 124 128 128 128 128 128 268
Symbol FLA FLB SL Q2A Q2B PON TCO VCC
x-axis/mm 2044 2044 2044 1980 1634 1322 1008 128
y-axis/mm 676 1012 1624 1876 1876 1876 1876 1098
The PAD coordinates are referred to the left bottom point of the contact window.
PAD Layout
TCO
PON
Q2B
Q2A SL
VCC
T4224B
FLB
IN1 FLA
IN
y-axis
GND
SB
Q1A
Q1B
REC
INT
DEC
x-axis Reference point (0/0)
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U4224B
Information Regarding German Transmitter
Station: DCF 77, Frequency 77.5 kHz, Transmitting power 50 kW Location: Mainflingen/Germany, Geographical coordinates: 50_ 0.1'N, 09_ 00'E Time of transmission: permanent
Time Frame 1 Minute
( index count 1 second )
Time Frame 40 45 50 55 0 5 10
0
5
10
15
20
25
30
35
coding when required
R A1 Z 1 Z 2 A2 S 1 2 4 8 10 20 40 P1 1 2 4 8 10 20 P 2 1 2 4 8 10 20 1 2 4 1 2 4 8 10 1 2 4 8 10 20 40 80 P3
minutes
hours
calendar day month day of the week
year
93 7527
Example:19.35 h 1 s sec. 20 21 22
2 23
4 24
8 25
10 26
20 27
40 28
P1 29
1 30
2 31
4 32
hours
8 33
10 34
20 35
P2
minutes Start Bit Parity Bit P1
Parity Bit P2
Modulation:
The carrier amplitude is reduced to 25 % at the beginning of each second for 100 ms (binary zero) or 200 ms (binary one) duration, excepting the 59th second.
Time Code Format: (based on information of Deutsche Bundespost)
It consists of 1 minute time frames. No modulation at the
beginning of the 59th second to recognize the switch over to the next 1 minute time frame. A time frame contains BCD-coded information of minutes, hours, calendar day, day of the week, month and year between the 20th second and 58th second of the time frame, including the start bit S (200 ms) and parity bits P1, P2 and P3. Further there are 5 additional bits R (transmission by reserve antenna), A1 (announcement of change-over to the summer time), Z1 (during the summer time 200 ms, otherwise 100 ms), Z2 (during standard time 200 ms otherwise 100 ms) and A2 (announcement of leap second) transmitted between the 15th second and 19th second of the time frame.
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U4224B
Information Regarding British Transmitter
Station: MSF Frequency 60 kHz Transmitting power 50 kW Location: Teddington, Middlesex Geographical coordinates: 52_ 22'N, 01_ 11'W Time of transmission: permanent, excepting the first tuesday of each month from 10.00 h to 14.00 h.
TIME FRAME 1 MINUTE
( index count 1 second)
TIME FRAME 45 50 55 0
0
0
5
10
15
20
25
30
35
40
5
10
80 40 20 10 8 4 2 1 10 8 4 2 1 20 10 8 4 2 1 4 2 1 20 10 8 4 2 1 40 20 10 8 4 2 1 0
year switch over to the next time frame
month
day of hour month day of week
minute Parity check bits
0 500 ms 500 ms
1
minute identifier BST hour + minute day of week day + month year BST 7 GMT change impending
93 7528
Example: March 1993 seconds 17
80
40
20
10
8
4
2
1
10
8
4
2
1
18
19
20
21
year
22
23
24
25
26
27
28
29
30
month
Modulation:
The carrier amplitude is switched off at the beginning of each second for the time of 100 ms (binary zero) or 200 ms (binary one).
Time Code Format:
It consists of 1 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 ms duration. The prescence of the fast code during the first 500 ms at the beginning of the minute in not guaranteed. The transmission rate is 100 bits/s and the code contains information of hour, minute, day and month.
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U4224B
Information Regarding US Transmitter
Station: WWVB Frequency 60 kHz Transmitting power 10 kW Location: Fort Collins Geographical coordinates: 40_ 40'N, 105_ 03'W Time of transmission: permanent.
TIME FRAME 1 MINUTE
( index count 1 second)
TIME FRAME 45 50 55 0
P0
0
P 0 FM R 40 20 10
5
10
15
20 10
20
25
200 100
30
35
40
5
10
AD D SU B AD D P4 800 400 200 100
80 40 20 10 P5 8 4 2 1
8 4 2 1 P1
8 4 2 1 P2
80 40 20 10 P3 8 4 2 1
minutes
hours
days
UTI UTI year sign correction
daylight savings time bits leap second warning bit leap year indicator bit "0" = non leap year "1" = leap year
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Example: UTC 18.42 h TIME FRAME P0 seconds0 1 40 20 10 2 3 4 5 8 6 4 7 2 8 1 P1 20 10 8 4 2 1 P2
9 10 11 12 13 14 15 16 17 18 19 20
hours
minutes Frame reference marker
Modulation:
The carrier amplitude is reduced 10 dB at the beginning of each second and is restored in 500 ms (binary one) or in 200 ms (binary zero).
Time Code Format:
It consists of 1 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 1 frame reference marker with reduced carrier amplitude of 800 ms duration.
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U4224B
Information Regarding Japanese Transmitter
Station: JG2AS Frequency 40 kHz Transmitting power 10 kW Location: Sanwa, Ibaraki Geographical coordinates: 36_ 11' N, 139_ 51' E Time of transmission: permanent
Time Frame 1 Minute
(index count 1 second)
Time Frame 40 45 50
P5
0
PO FRM 40 20 10
5
10
20 10
15
20
200 10 0
25
30
35
55
0
P0
5
10
minutes
hours
da ys code dut1
Example: 18.42 h Time Frame P0 40 20 10 8 4 2 1 P1 20 10 8 4 2 1 P2
sec. 59 0
1
2
3
4
5
minutes
6
7
8
9
10 11 12 13 14 15 16 17 18 19 20
hours position identifier marker P1
frame reference marker (FRM) position identifier marker P0
0.5 second: Binary one 0.8 second: Binary zero 0.2 second: Identifier markers P0...P5 0.5 s "1" 0.8 s "0" 0.2 s
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"P"
Modulation:
The carrier amplitude is 100% at the beginning of each second and is switched off after 500 ms (binary one) or after 800 ms (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 800 ms duration.
Ordering and Package Information
Extended type number U4224B-CFL U4224B-CFLG3 T4224B-CF T4224B-CC Package SO 16 L plastic SO 16 L plastic no no Remarks Taping according to IEC-286-3 die on foil die on tray
TELEFUNKEN Semiconductors Rev. A3, 02-Apr-96
ADD SUB ADD P4 8 4 2 1
8 4 2 1 P2
8 4 2 1 P1
80 40 20 10 P3 8 4 2 1
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U4224B
Dimensions in mm
Package: SO 16 L
94 8961
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U4224B
Ozone Depleting Substances Policy Statement
It is the policy of TEMIC TELEFUNKEN microelectronic GmbH to 1. Meet all present and future national and international statutory requirements. 2. Regularly and continuously improve the performance of our products, processes, distribution and operating systems 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 ( 1987) and its London Amendments ( 1990) 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. 1. Annex A, B and list of transitional substances of the Montreal Protocol and the London Amendments respectively 2 . Class I and II ozone depleting substances in the Clean Air Act Amendments of 1990 by the Environmental Protection Agency ( EPA) in the USA 3. Council Decision 88/540/EEC and 91/690/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 claims, 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-74025 Heilbronn, Germany Telephone: 49 ( 0 ) 7131 67 2831, Fax number: 49 ( 0 ) 7131 67 2423
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