SP5070 2.GHz Fixed Modulus Frequency Synthesiser DS3966-2.2 May 996 The SP5070 is a single modulus frequency synthesiser for use in Satellite TV receivers and together with an appropriate voltage controlled oscillator (VCO), forms a complete phase locked loop (PLL) synthesiser. The circuit consists of a prescaler with preamplifier and a fixed modulus divider. The phase comparator is fed with a reference frequency derived from an external oscillator or crystal. The comparator has a charge pump output amplifier stage around which feedback may be applied. Only an external transistor is required for varicap line driving. FEATURES ■ Low Power Consumption (5V, 47mA typ.) ■ Prescaler and Preamplifier Included ■ Charge Pump Amplifier with Feedback Point ■ Charge Pump Disable Facility ■ Synthesises Frequencies up to 2.4GHz ■ Pin and Function Compatible with SP5060 and SP5062 ■ Full ESD Protection* VCC 1 14 TEST 1 RF INPUT 2 13 TEST 2 RF INPUT 3 12 NC NC 4 11 CPDIS REF IN/CRYSTAL SP5070 NC 5 10 VEE 6 9 OSCILLATOR CAPACITOR DRIVE OUTPUT 7 8 CHARGE PUMP DP14 VCC 1 14 TEST 1 RF INPUT 2 13 TEST 2 RF INPUT 3 12 NC SP5070F NC * Normal ESD handling procedures should be observed. APPLICATIONS ■ Satellite TV ■ High IF Cable Tuning Systems ■ C-Band with Frequency Doubling Mixer 4 11 CPDIS REF IN/CRYSTAL NC 5 10 VEE 6 9 OSCILLATOR CAPACITOR DRIVE OUTPUT 7 8 CHARGE PUMP MP14 Fig.1 Pin connections - top view ORDERING INFORMATION SP5070 DP SP5070F MP RF IN RF IN - (14 Lead Plastic Package) - (14 Lead Miniature Plastic Package) 2 3 PRE AMP PRESCALER ÷32 FIXED MODULUS DIVIDER ÷8192 8 PUMP FDIV PHASE COMP REFERENCE DIVIDER ÷1024 CHARGE PUMP 7 FCOMP 1 OUTPUT BUFFER 9 10 OSCILLATOR REF IN/ CAPACITOR CRYSTAL DRIVE 14 13 TEST 1 TEST 2 Fig.2 Block diagram of SP5070 6 11 CPDIS V CC V EE SP5070 ELECTRICAL CHARACTERISTICS Tamb = -40°C to +85°C,VCC = +4.5V to +5.5V. These characteristics are guaranteed by either production test or design. They apply within the specified ambient temperature and supply voltage ranges unless otherwise stated. Min Value Typ Max 1 - 47 55 mA Prescaler input voltage Prescaler input voltage 2,3 2,3 50 100 - 300 300 mVRMS mVRMS Prescaler input impedance Input capacitance 2,3 2,3 - 50 2 - Ω pF Charge pump output current Charge pump output leakage Drift due to leakage 8 8 - - ±100 - ±5 5 µA nA mV/s Charge pump drive output current Charge pump amplifier gain 7 1 - - mA - 6400 - - Characteristics Supply current Symbol Pin ICC Units Conditions VCC = 5V 300MHz to 1.8GHz sinewave 2.4GHz, see Fig.5 V pin 8 = 2.0V V pin 8 = 2.0V At collector of External Varicap Drive transistor V pin 7 = 0.7V pin 7 current 100µa Oscillator temperature stability Oscillator stability with supply voltage 9,10 9,10 - - 2 2 ppm/°C ppm/V Reference clock frequency External reference amplitude 10 10 2 150 - 10 500 MHz mVRMS Charge pump disable/TEST 1 and TEST 2/enable Charge pump disable leakage 11 -250 - -500 µA VIN<0V 11 - - 10 µA V pin 11= VCC TEST 1/TEST 2 sink current 13,14 1 - - mA VOUT = 0.7V TEST 1/TEST 2 leakage current 13,14 - - 10 µA VOUT = VCC+0.3V TEST 1/TEST 2 voltage 13,14 - - VCC+0.3 V ABSOLUTE MAXIMUM RATINGS All voltages are referred to VEE = 0V Value Characteristics Supply voltage RF input voltage RF input DC offset Charge pump DC offset Charge pump disable Drive DC offset Crystal oscillator DC offset TEST outputs Storage temperature Junction temperature DP14 thermal resistance, chip-to-ambient DP14 thermal resistance, chip-to-case MP14 thermal resistance, chip-to-ambient MP14 thermal resistance, chip-to-case Power consumption at 5.5V 2 Pin Min Max Units 1 2,3 2,3 8 11 7 9,10 13,14 - -0.3 -0.3 -0.3 -0.7 -0.3 -0.3 -0.3 -55 - 7 2.5 VCC+0.3 VCC+0.3 VCC+0.3 VCC+0.3 VCC+0.3 VCC+0.3 150 +150 78 30 123 45 275 V Vp-p V V V V V V °C °C °C/W °C/W °C/W °C/W mW SP5070 FUNCTIONAL DESCRIPTION The SP5070, when used with a voltage controlled oscillator, forms a complete phase locked loop frequency synthesiser. The phase comparator comparison frequency is obtained by dividing the reference frequency. This may be generated on-chip by means of an external crystal, or from an external reference oscillator. The output of the prescaler is divided by the fixed modulus divider, producing an output frequency which is phased locked to the comparison frequency. The divider stages are arranged to give a fixed ratio between the synthesised frequency and the reference of 256:1. Any frequency within the range of 300MHz to 2.4GHz may be achieved by using the appropriate reference or crystal frequency. A single external transistor, driven from the charge pump output, provides the output drive necessary for the oscillator varicap line. A test facility which disables the charge pump is also provided. This is activated when a negative voltage is applied to pin 11, see electrical characteristics above. When the device is in this mode, FCOMP and FDIV are also available at outputs TEST1 and TEST2 respectively. These are open collector outputs and are each capable of sinking a minimum of 1mA. In normal mode of operation these outputs are high impedance. For compatibility with SP5060/SP5062, pin 11 may be connected toVCC +5V FROM VCO 1n 2 1n 14 1 3 4 5 6 S P 5 0 7 0 7 13 12 11 10 9 180n 8 22K +30V 47n 4MHz REFERENCE CRYSTAL 68p 47P 22K 10K 2N3904 VARICAP VCO 47K INPUT 10n Fig.3 Typical application and test circuit (1024MHz with 4MHz reference crystal) +5V FROM VCO 1n 1n 14 1 2 3 4 5 6 7 S P 5 0 7 0 13 12 100p 11 FROM REFERENCE OSCILLATOR 10 9 180n 8 22K +30V 47n DP 22K 10K 2N3904 VARICAP VCO 47K INPUT 10n Fig.4 Application using external reference oscillator 3 SP5070 S11:Z0 = 50Ω Fig.5 Typical input sensitivity Fig.6 Typical input impedance RF input Loop amplifier Reference oscillator TEST 1and TEST 2 outputs Fig.7 SP5070 input/output interface circuits 4 FREQUENCY MARKER STEP = 500MHz http://www.mitelsemi.com World Headquarters - Canada Tel: +1 (613) 592 2122 Fax: +1 (613) 592 6909 North America Tel: +1 (770) 486 0194 Fax: +1 (770) 631 8213 Asia/Pacific Tel: +65 333 6193 Fax: +65 333 6192 Europe, Middle East, and Africa (EMEA) Tel: +44 (0) 1793 518528 Fax: +44 (0) 1793 518581 Information relating to products and services furnished herein by Mitel Corporation or its subsidiaries (collectively “Mitel”) is believed to be reliable. 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