Stand-alone Tri Band Time Signal AM Receiver IC

www.DataSheet4U.com DA9179.002 19 May, 2005 MAS9179 AM Receiver IC • Tri Band Receiver IC • High Sensitivity • Very Low Power Consumption • Wide Supply Voltage Range • Power Down Control • Control for AGC On • High Selectivity by Crystal Filter • Fast Startup Feature DESCRIPTION The MAS9179 AM-Receiver chip is a highly sensitive, simple to use AM receiver specially intended to receive time signals in the frequency range from 40 kHz to 100 kHz. Only a few external components are required for time signal receiving. The circuit has preamplifier, wide range automatic gain control, demodulator and output comparator built in. The output signal can be processed directly by an additional digital circuitry to extract the data from the received signal. The control for AGC (automatic gain control) can be used to switch AGC on or off if necessary. MAS9179 supports tri band operation by switching between three crystal filters and two additional antenna tuning capacitors. MAS9179 has differential input and different internal compensation capacitor options for compensating shunt capacitances of different crystals (See ordering information on page 9). FEATURES • • • • • • • • • • Tri Band Receiver IC Highly Sensitive AM Receiver, 0.4 µVRMS typ. Wide Supply Voltage Range from 1.1 V to 5 V Very Low Power Consumption Power Down Control Fast Startup Only a Few External Components Necessary Control for AGC On Wide Frequency Range from 40 kHz to 100 kHz High Selectivity by Quartz Crystal Filter APPLICATIONS • Multi Band Time Signal Receiver WWVB (USA), JJY (Japan), DCF77 (Germany), MSF (UK), HGB (Switzerland) and BPC (China) BLOCK DIAGRAM QO3 RFIP RFIM QO2 QO1 QI AON Demodulator & Comparator OUT AGC Amplifier RFI2 RFI3 Power Supply/Biasing VDD VSS PDN1 PDN2 AGC DEC 1 (9) www.DataSheet4U.com DA9179.002 19 May, 2005 PAD LAYOUT MAS9179Ax, x=1..4 VDD QO2 QO1 QO3 QI AGC PDN2 OUT VSS RFI2 RFIM RFIP RFI3 PDN1 AON DEC 1620 µm DIE size = 1.62 x 1.89 mm; round PAD ∅ 80 µm Note: Because the substrate of the die is internally connected to VDD, the die has to be connected to VDD or left floating. Please make sure that VDD is the first pad to be bonded. Pick-and-place and all component assembly are recommended to be performed in ESD protected area. Note: Coordinates are pad center points where origin has been located in bottom-left corner of the silicon die. Pad Identification Power Supply Voltage Quartz Filter Output for Crystal 2 Quartz Filter Output for Crystal 1 Quartz Filter Output for Crystal 3 Quartz Filter Input for Crystals AGC Capacitor Power Down/Frequency Selection Input 2 Receiver Output Demodulator Capacitor AGC On Control Power Down/Frequency Selection Input 1 Receiver Input 3 (for Antenna Capacitor 3) Positive Receiver Input Negative Receiver Input Receiver Input 2 (for Antenna Capacitor 2) Power Supply Ground Name VDD QO2 QO1 QO3 QI AGC PDN2 OUT DEC AON PDN1 RFI3 RFIP RFIM RFI2 VSS X-coordinate 174 µm 174 µm 174 µm 174 µm 174 µm 174 µm 174 µm 175 µm 1442 µm 1442 µm 1442 µm 1442 µm 1442 µm 1442 µm 1442 µm 1442 µm Y-coordinate 1657 µm 1452 µm 1248 µm 1043 µm 839 µm 634 µm 429 µm 225 µm 240 µm 444 µm 649 µm 853 µm 1058 µm 1262 µm 1467 µm 1671 µm Note 1892 µm 3 1 2 3 4 4 Notes: 1) OUT = VSS when carrier amplitude at maximum; OUT = VDD when carrier amplitude is reduced (modulated) - the output is a current source/sink with |IOUT| > 5 µA - at power down the output is pulled to VSS (pull down switch) 2) AON = VSS means AGC off (hold current gain level); AON = VDD means AGC on (working) - Internal pull-up with current < 1 µA which is switched off at power down 3) PDN1 = VDD and PDN2 = VDD means receiver off - Fast start-up is triggered when the receiver is after power down controlled to power up 4) Receiver inputs RFIP and RFIM have both 600 kΩ biasing MOSFET-transistors towards ground 2 (9) www.DataSheet4U.com DA9179.002 19 May, 2005 FREQUENCY SELECTION The frequency selection and power down control is accomplished via two digital control pins PDN1 and PDN2. The control logic is presented in table 1. Table 1 Frequency selection and power down control PDN2 RFI2 Switch RFI3 Switch PDN1 High High Low Low High Low High Low Open Open Closed Closed Open Open Open Closed Selected Crystal Output QO1 QO2 QO3 Description Power down Frequency 1 Frequency 2, RFI2 capacitor connected in parallel with antenna Frequency 3, RFI2 and RFI3 capacitors connected in parallel with antenna The internal antenna tuning capacitor switches (RFI2, RFI3) and crystal filter output switches (QO1, QO2, QO3) are controlled according table 1. See switches in block diagram on page 1. If frequency 1 is selected the RFI2 and RFI3 switches are open and only crystal output QO1 is active. Antenna frequency is determined by antenna inductor LANT (see Typical Application on page 5), antenna capacitor CANT1 and parasitic capacitances related to antenna inputs RFIP, RFIM, RFI2 and RFI3 (see Antenna Tuning Considerations below). Frequency 1 is the highest frequency of the three selected frequencies. If frequency 2 is selected then RFI2 switch is closed to connect CANT2 to pin RFIM in parallel with ferrite antenna and tune it to frequency 2. Then only crystal output QO2 is active. Frequency 2 is the medium frequency of the three selected frequencies. If frequency 3 is selected both RFI2 and RFI3 switches are closed to connect both CANT2 and CANT3 capacitors to RFIM pin in parallel with ferrite antenna and tune it to frequency 3. Then only crystal QO3 is active. Frequency 3 is the lowest frequency of the three selected frequencies. It is recommended to switch the device to power down for 50ms before switching to another frequency. This guarantees fast startup in switching to another frequency. The 50ms power down period is used to discharge AGC capacitor and to initialize fast startup conditions. 3 (9) www.DataSheet4U.com DA9179.002 19 May, 2005 ANTENNA TUNING CONSIDERATIONS The ferrite bar antenna having inductance LANT and parasitic coil capacitance CCOIL is tuned to three reception frequencies f1, f2 and f3 by parallel capacitors CANT1, CANT2 and CANT3. The receiver input stage and internal antenna capacitor switches have capacitances CRFIP, COFF2, COFF3 which affect the resonance frequencies. COFF2 and COFF3 are switch capacitances when switches are open. When switches are closed these capacitances are shorted by on resistance of the switches and they are effectively eliminated. Following relationships can be written into three tuning frequencies. Frequency f1 (highest frequency): CTOT1=CCOIL+CANT1+CRFIP+COFF2+COFF3=CCOIL+CANT1+6pF+37pF+119pF=CCOIL+CANT1+162pF, 1 f1 = 2π L ANT ⋅ CTOT 1 Frequency f2 (middle frequency): CTOT2=CCOIL+CANT1+CANT2+CRFIP+COFF3=CCOIL+CANT1+CANT2+ 6pF+119pF=CCOIL+CANT1+CANT2+ 125pF, 1 f2 = 2π L ANT ⋅ CTOT 2 Frequency f3 (lowest frequency): CTOT3=CCOIL+CANT1+ CANT2+ CANT3+CRFIP=CCOIL+CANT1+ CANT2+ CANT3+6pF, 1 f3 = 2π L ANT ⋅ CTOT 3 4 (9) www.DataSheet4U.com DA9179.002 19 May, 2005 ABSOLUTE MAXIMUM RATINGS Parameter Supply Voltage Input Voltage Power Dissipation Operating Temperature Storage Temperature Symbol VDD-VSS VIN PMAX TOP TST Conditions Min -0.3 VSS-0.3 -40 -55 Max 6 VDD+0.3 100 +85 +150 Unit V V mW o C o C ELECTRICAL CHARACTERISTICS Operating Conditions: VDD = 1.4V, Temperature = 25°C Parameter Operating Voltage Current Consumption Symbol VDD IDD Conditions VDD=1.4 V, Vin=0 µVrms VDD=1.4 V, Vin=20 mVrms VDD=3.6 V, Vin=0 µVrms VDD=3.6 V, Vin=20 mVrms Min 1.10 Typ 64 37 67 40 Max 5 Unit V µA 31 27 40 Stand-By Current Input Frequency Range Minimum Input Voltage Maximum Input Voltage Receiver Input Resistance Receiver Input Capacitance RFI2 Switch On Resistance RFI2 Switch Off Capacitance RFI3 Switch On Resistance RFI3 Switch Off Capacitance Input Levels |lIN|<0.5 µA Output Current VOL<0.2 VDD;VOH >0.8 VDD Output Pulse IDDoff fIN VIN min VIN max RRFI CRFI RON2 COFF2 RON3 COFF3 VIL VIH |IOUT| T100ms T200ms T500ms T800ms 0.4 20 f=40kHz..77.5 kHz VDD=1.4 V VDD=1.4 V 0.8 VDD 5 1 µVrms ≤ VIN ≤ 20 mVrms 1 µVrms ≤ VIN ≤ 20 mVrms 1 µVrms ≤ VIN ≤ 20 mVrms 1 µVrms ≤ VIN ≤ 20 mVrms Fast Start-up, Vin=0.4 µVrms Fast Start-up, Vin=20 mVrms 50 150 400 700 500 800 1.3 3.5 50 230 6 3.8 37 2.4 119 91 65 0.1 100 1 µA kHz µVrms mVrms kΩ pF Ω pF Ω pF V µA 0.2 VDD 140 230 600 900 ms ms ms ms s Startup Time Output Delay Time TStart TDelay 100 ms 5 (9) www.DataSheet4U.com DA9179.002 19 May, 2005 TYPICAL APPLICATION X3 X2 X1 Note 1 Optional Control for AGC on/hold QI AON Demodulator & Comparator OUT Receiver Output QO3 LANT CANT1 CANT3 CANT2 RFIP QO2 QO1 AGC Amplifier RFIM Ferrite Antenna RFI2 RFI3 Power Supply/Biasing VDD VBATTERY VSS PDN1 PDN2 AGC DEC + CAGC CDEC Power Down / Fast Startup / Frequency Selection Note 2 Figure 1 Application circuit of tri band receiver MAS9179 X3 40.003 kHz X2 60.003kHz X1 77.503kHz Optional Control for AGC on/hold QI AON Demodulator & Comparator OUT Receiver Output QO3 LANT 3.07mH CANT1 1.2nF CANT3 0.91nF CANT2 3nF RFIP QO2 QO1 AGC Amplifier RFIM Ferrite Antenna RFI2 RFI3 Power Supply/Biasing VDD 1.4 V VSS PDN1 PDN2 AGC DEC + CAGC 10 µF Power Down / Fast Startup / Frequency Selection CDEC 47 nF Figure 2 Example circuit of tri band receiver MAS9179 for DCF77/MSF/WWVB/JJY frequencies 6 (9) www.DataSheet4U.com DA9179.002 19 May, 2005 TYPICAL APPLICATION (Continued) Note 1: Crystals The crystals as well as ferrite antenna frequencies are chosen according to the time-signal system (Table 2). The crystal shunt capacitance C0 should be matched as well as possible with the internal shunt capacitance compensation capacitor CC of MAS9179. See Compensation Capacitance Options on table 3. Table 2 Time-Signal System Frequencies Time-Signal System Location DCF77 HGB MSF WWVB JJY BPC Germany Switzerland United Kingdom USA Japan China Antenna Frequency