ML12179-5P

ML12179 500-2800 MHz Single Channel Frequency Synthesizer Legacy Device: Motorola MC12179 The ML12179 is a monolithic Bipolar synthesizer integrating the high frequency prescaler, phase/frequency detector, charge pump, and reference oscillator/buffer functions. When combined with an external loop filter and VCO, the ML12179 serves as a complete PLL subsystem. The device is designed for operation up to 2.8 GHz for high frequency applications such as CATV down converters and satellite receiver tuners. 8 • 2.8 GHz Maximum Operating Frequency • Low Power Supply Current of 3.5 mA Typical, Including ICC and IP Current • Supply Voltage of 5.0 V Typical • Integrated Divide by 256 Prescaler • On–Chip Reference Oscillator/Buffer – 2.0 to 11 MHz Operation When Driven From Reference Source – 5.0 to 11 MHz Operation when used with a Crystal • Digital Phase/Frequency Detector with Linear Transfer Function • Balanced Charge Pump Output • Space Efficient 8–Lead SOIC • Operating Temperature Range TA = –40° to +85°C 1 SO 8 = -5P PLASTIC PACKAGE CASE 751 (SO–8) CROSS REFERENCE/ORDERING INFORMATION PACKAGE MOTOROLA LANSDALE SO 8 MC12179D ML12179-5P Note: Lansdale lead free (Pb) product, as it becomes available, will be identified by a part number prefix change from ML to MLE. MAXIMUM RATINGS (Note 1) Parameter Power Supply Voltage, Pin 2 Power Supply Voltage, Pin 7 Storage Temperature Range Symbol VCC VP Tstg Value –0.5 to 6.0 VCC to 6.0 –65 to 150 Unit Vdc Vdc °C OSCin VCC Gnd Fin PIN CONNECTIONS NOTES: 1. Maximum Ratings are those values beyond which damage to the device may occur. Functional operation should be restricted to the Recommended Operating Conditions as identified in the Electrical Characteristics table. 1 2 3 4 8 7 6 5 OSCout VP PDout GndP Block Diagram OSCin OSCout Crystal Oscillator fr Phase/Frequency Detector Charge Pump PDout (Top View) Fin Prescaler ÷ 256 fv Page 1 of 11 www.lansdale.com Issue A ML12179 LANSDALE Semiconductor, Inc. ELECTRICAL CHARACTERISTICS (VCC = 4.5 to 5.5 V; VP = VCC to 5.5 V; TA = –40 to 85 C, unless otherwise noted.) Characteristic Supply Current for VCC Supply Current for VP Operating Frequency Operating Frequency Input Sensitivity Input Sensitivity fINmax fINmin Crystal Mode External Oscillator OSCin Fin External Oscillator OSCin (PDout) (PDout) (PDout) Symbol ICC IP FIN FOSC VIN VOSC IOH IOL IOZ Min – – 2800 – 5 2 200 500 –2.8 1.6 – Typ 3.1 0.4 – – – – – – –2.2 2.2 0.5 Max 5.6 1.3 – 500 11 11 1000 2200 –1.6 2.8 15 Unit mA mA MHz MHz mVP–P mVP–P mA mA nA Condition Note 1 Note 1 Note 2 Note 3 Note 4 Note 2 Note 4 VP = 4.5 V, VPDout = VP/2 VP = 4.5 V, VPDout = VP/2 VP = 5.0 V, VPDout = VP/2 Output Source Current5 Output Sink Current5 Output Leakage Current NOTES: 1. VCC and VP = 5.5 V; FIN = 2.56 GHz; FOSC = 10 MHz crystal; PDout open. 2. AC coupling, FIN measured with a 1000 pF capacitor. 3. Assumes C1 and C2 (Figure 1) limited to 30 pF each including stray and parasitic capacitances. 4. AC coupling to OSCin. 5. Refer to Figure 15 and Figure 16 for typical performance curves over temperature and power supply voltage. PIN FUNCTION DESCRIPTION Pin 1 Symbol OSCin I/O I Function Oscillator Input – An external parallel–resonant, fundamental crystal is connected between OSC in and OSCout to form an internal reference oscillator (crystal mode). External capacitors C1 and C2, as shown in Figure 1, are required to set the proper crystal load capacitance and oscillator frequency. For an external reference oscillator, an external signal is AC–coupled to the OSCin pin with a 1000 pF coupling capacitor, with no connection to OSCout. In either mode, a resistor with a nominal value of 50 kΩ MUST be placed across the OSCin and OSCout pins for proper operation. Positive Power Supply. Bypass capacitors should be placed as close as possible to the pin and be connected directly to the ground plane. Ground. Prescaler Input – The VCO signal is AC coupled into the Fin pin. Ground – For charge pump circuitry . Single ended phase/frequency detector output (charge pump output). Three–state current sink/source output for use as a loop error signal when combined with an external low pass filter. The phase/frequency detector is characterized by a linear transfer function. Positive power supply for charge pump. VP MUST be equal or greater than VCC. Bypass capacitors should be placed as close as possible to the pin and be connected directly to the ground plane. Oscillator output, for use with an external crystal as shown in Figure 1. 2 3 4 5 6 VCC Gnd Fin GndP PDout – – I – O 7 8 VP OSCout – O Page 2 of 11 www.lansdale.com Issue A ML12179 LANSDALE Semiconductor, Inc. Figure 1. ML12179 Expanded Block Diagram +5.0 V 2 C1 1 8 C2 NOTE: External 50 kΩ resistor across Pins 1 and 8 is necessary in either crystal or driven mode. 4 VCO 1000 pF VCC OSCin OSCout Crystal Oscillator fr Phase/Frequency Detector fv Fin Prescaler ÷ 256 GND 3 GNDP 5 Charge Pump PDout 6 To Loop Filter VP 7 +5.0 V PHASE CHARACTERISTICS The phase comparator in the ML12179 is a high speed digital phase/frequency detector circuit. The circuit determines the “lead” or “lag” phase relationship and time difference between the leading edges of the VCO (fv) signal and the reference (fr) input. The detector can cover a range of ±2π radian of fv/fr phase difference. The operation of the charge pump output is shown in Figure 2. fr lags fv in phase OR fv>fr in frequency When the phase of fr lags that of fv or the frequency of fv is greater than fr, the Do output will sink current. The pulse width will be determined by the time difference between the two rising edges. fr leads fv in phase OR fv