SP5070

SP5070 MITEL | Alldatasheet

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Technical content

V CC REF IN/CRYSTAL OSCILLATOR CAPACITOR NC RF INPUT VEE DP14 CPDIS 8DRIVE OUTPUT CHARGE PUMP TEST 2 TEST 1 NC RF INPUT NC SP5070 VCC REF IN/CRYSTAL OSCILLATOR CAPACITOR NC RF INPUT VEE MP14 CPDIS DRIVE OUTPUT CHARGE PUMP TEST 2 TEST 1 NC RF INPUT NC SP5070F 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

n Low Power Consumption (5V, 47mA typ.) n Prescaler and Preamplifier Included n Charge Pump Amplifier with Feedback Point n Charge Pump Disable Facility n Synthesises Frequencies up to 2.4GHz n Pin and Function Compatible with SP5060 and SP5062 n Full ESD Protection* * Normal ESD handling procedures should be observed.

APPLICATIONS

n High IF Cable Tuning Systems n C-Band with Frequency Doubling Mixer

ORDERING INFORMATION

SP5070 DP - (14 Lead Plastic Package) SP5070F MP - (14 Lead Miniature Plastic Package) Fig.1 Pin connections - top view Fig.2 Block diagram of SP5070 RF IN RF IN OSCILLATOR CAPACITOR REF IN/ CRYSTAL TEST 1 TEST 2 CPDIS PUMP DRIVE V CC V EE FDIV FCOMP CHARGE PUMP FIXED MODULUS DIVIDER ÷8192 1113149 10 OUTPUT BUFFER COMPPHASE PRESCALER ÷32 PRE AMP REFERENCE DIVIDER ÷1024 SP5070 2.GHz Fixed Modulus Frequency Synthesiser DS3966-2.2 May 996

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. Characteristics Symbol Pin Min Value Typ Max Units Conditions Supply current ICC 1 - 47 55 mA VCC = 5V Prescaler input voltage Prescaler input voltage 2,3 2,3 100 300 300 mV RMS mV RMS 300MHz to 1.8GHz sinewave 2.4GHz, see Fig.5 Prescaler input impedance Input capacitance 2,3 2,3 Ω pF Charge pump output current Charge pump output leakage Drift due to leakage Charge pump drive output current Charge pump amplifier gain ±100 6400 µA nA mV/s mA 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 ppm/°C ppm/V Reference clock frequency External reference amplitude 150 500 MHz mV RMS Charge pump disable/TEST 1 and TEST 2/enable Charge pump disable leakage -250 -500 µA µA VIN<0V 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 Characteristics Pin Value Units Min Max 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 2,3 2,3 9,10 13,14 -0.3 -0.3 -0.3 -0.7 -0.3 -0.3 -0.3 -55 2.5 V CC +0.3 VCC +0.3 VCC +0.3 VCC +0.3 VCC +0.3 VCC +0.3 150 +150 123 275 V Vp-p V V V V V V °C/W °C/W °C/W °C/W mW

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, F COMP 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 toV CC Fig.3 Typical application and test circuit (1024MHz with 4MHz reference crystal) Fig.4 Application using external reference oscillator DP14 S P +5V FROM VCO 2N3904 10K 47K 10n 22K22K 47n 180n +30V 100p FROM REFERENCE OSCILLATOR VARICAP INPUT VCO S P +5V FROM VCO 2N3904 10K 47K 10n 22K22K 47n 180n +30V 68p 4MHz REFERENCE CRYSTAL VARICAP INPUT VCO 47P

Fig.5 Typical input sensitivity Fig.6 Typical input impedance Fig.7 SP5070 input/output interface circuits S = 50 W FREQUENCY MARKER STEP = 500MHz RF input Loop amplifier Reference oscillator TEST 1and TEST 2 outputs

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