ZL40812 10GHz Fixed Modulus ÷ 16 Data Sheet Features • • • • • • Issue 1 Very High Operating Speed Operation down to DC with Square Wave Input Low Phase Noise (Typically better than -150dBc/Hz at 1kHz) 5V Single Supply Operation Low Power Dissipation: 420mW (Typ) Surface Mount Plastic Package With Exposed Pad (See Application Notes Ordering Information ZL40812/DCE (tubes) 8 lead e-pad SOIC ZL40812/DCF (tape and reel) 8 lead e-pad SOIC -40°C to +85°C Description Description The ZL40812 is one of a range of 5V supply, very high speed low power prescalers for professional applications with a fixed modulus of divide by 16. The dividing elements are static D type flip flops and therefore allow operation down to DC if the drive signal is a pulse waveform with fast risetimes. The output stage has internal 50 ohm pull up giving a 1V p-p output. See application notes for more details. Applications • • • • • • • November 2002 DC to 10 GHz PLL applications HyperLan LMDS Instrumentation Satellite Communications Fibre Optic Communications; OC48, OC192 Ultra Low Jitter Clock Systems VCC OUT VCC IN 1 8 50R 7 OUTPUT 6 OUTPUT B /16 400R INPUT INPUT B 2 20mA 3 4,5 GND Figure 1 - Block Diagram 1 ZL40812 Data Sheet Pin Connection - Top View Vcc INPUT INPUT INPUT B 1 GND 8 Vcc OUTPUT 2 7 OUTPUT 3 6 OUTPUT B 4 5 GND SOIC (N) E-Pad Application Configuration Figure 2 shows a recommended application configuration. This example shows the devices set up for single ended operation. Vcc 5V R3:100ohm C8:10nF C3:100pF 1 8 2 7 3 6 4 5 C1:10uF C6:10nF C4:100pf R1:50ohm C2:10nF C5:100pf C7:10nF R2:50ohm Example Configuration for Single ended operation Figure 2 - Recommended Circuit Configuration The above circuit diagram shows some components in dotted lines. These are optional in many applications. 1. C1 (10 µF) and C2 (10 nF) power supply decoupling capacitors may be available on the board already. 2. R3 (100 Ohm) and C8 (10 nF) can be included if further power supply decoupling is required for the first stage biasing circuit. This may optimise the noise and jitter performance. The values are suggestions and may have to be modified if the existing supplies are particularly noisy. 3. R1 (50 Ohm), in series with C5 (100 pF), may reduce feedthrough of the input signal to the output. 4. R2 (50 Ohm) and C7 (10 nF) will help to balance the current drawn from the power supply and may reduce voltage transients on the power supply line 2 Zarlink Semiconductor Inc. ZL40812 Data Sheet Evaluation Boards From Zarlink Semiconductor Zarlink Semiconductor provide a prescaler evaluation board. These are primarily for those interested in performing their own assessment of the operation of the prescalers. The boards are supplied unpopulated and may be assembled for single ended or differential input and output operation. Once assembled, all that is required is an Rf source and a DC supply for operation. The inputs and outputs are connected via side launch SMA connectors. Absolute Maximum Ratings Parameter Symbol 1 Supply Voltage 2 Prescaler Input Voltage 3 ESD protection (Static Discharge) 4 Storage temperature 5 Maximum Junction Temp 6 Thermal Characteristics Min Vcc Max Units 6.5V TST -65 Thja 2.5 Vp-p 2 kV 150 ºC 125 ºC 58.6 °C/W multi-layer PCB AC/DC Electrical Characteristics Electrical Characteristics (Tamb = 25C, Vcc = 5V)† Characteristic Pin Min. Typ. Supply current 1 0.35 Supply current 8 100 Input frequency 2,3 Input sensitivity 2,3 -8 Input sensitivity 2,3 -15 Input sensitivity 2,3 -10 Input overload 2,3 Input overload 2,3 Input Edge Speed 2,3 Output voltage 6,7 Output power 6,7 Phase Noise (10kHz offset) 6,7 O/P Duty Cycle 6,7 ‡ Max. Input stage bias current 130 mA Divider and output stages 11 GHz RMS sinewave (See Note 1) dBm fin = 1GHz to 2GHz -10 dBm fin = 2GHz to 9.5GHz 0 dBm fin = 11GHz 8 dBm fin = 1GHz to 4GHz 11 dBm fin = 5GHz to 11GHz V/ìs For <2GHz operation. Vp-p Differential Into 50ohm pullup resistors dBm Single-ended output, fin = 2GHz to 10GHz, pwr ip= -10dBm dBc/Hz Fin = 5GHz, pwr ip = 0dBm 900 1 -1 1.2 -152 45 Conditions mA 2 -3 Units 50 55 % Note 1: The device characterisation test method incremented the amplitude over the entire range of frequency and ensures that there are no "holes" in the characteristic. † Input sensitivity and output power values assume 50 Ohm source and load impedances. ‡ Characteristics are guaranteed by either production test or design. Zarlink Semiconductor Inc. 3 ZL40812 Data Sheet Typical input sensitivity (sinewave drive) @ +25 Deg C 20.00 10.00 Vin int 0.00 o 50 Oh m (d -10.00 Bm ) GUARANTEED OPERATING WINDOW 25C MAX (Typ) -20.00 Input frequency extends to DC if the source has an edge speed of 900 V/us or more -30.00 -40.00 0 1 2 3 4 5 6 7 8 9 10 11 12 13 Input Frequency (GHz) Electrical Characteristics Characteristics Pin (Vcc = 5V ±5%, Tamb = -40 to +85C)† ‡ Min. Typ. Supply current 1 Supply current 8 70 99 Supply current 8 57 Supply current 8 Supply current Max. Conditions mA Input stage bias current, see Note 1. 127 mA -40 degC 5.25V 80 103 mA -40 degC 4.75V 78 109 140 mA +25 degC 5.25V 8 63 88 114 mA +25 degC 4.75V Supply current 8 84 119 153 mA +85 degC 5.25V Supply current 8 65 94 123 mA +85 degC 4.75V Note 1: 0.35 Units st Pin 1 is the Vcc pin for the 1 stage bias current. In some applications e.g. if the power supply is noisy, it may be advantageous to add further supply decoupling to this pin (i.e. an additional R, C filter, see diagram of the recommended circuit configuration, Figure 2). † These characteristics are guaranteed by design and characterisation over the range of operating conditions unless otherwise stated. ‡ (Input Frequency range 1 to 10GHz rms Sinewave) 4 Zarlink Semiconductor Inc. ZL40812 Data Sheet Input and Output Characteristics† Characteristic Pin Min. Input sensitivity 2,3 Input overload 2,3 2 Input overload 2,3 Input overload Typ. -15 Max. -10 Units Conditions dBm Tamb = 85C, Fin = 2 to 8 GHz 5 dBm fin = 2 GHz 2 8 dBm fin = 4 GHz 2,3 5 13 dBm fin = 9 GHz Input overload 2,3 5 11 dBm fin = 10 GHz Input Edge Speed 2,3 900 V/ìs For <2GHz Operation, see Note 1 Output voltage 6,7 Vp-p Differential Into 50ohm pullup resistors Output power 6,7 -4 -1 2 dBm Single-ended output, fin = 2GHz to 10GHz, pwr ip= -10dBm O/P Duty Cycle 6,7 45 50 55 % Trise and Tfall 6,7 1 110 ps Note 1: for an input signal frequency of less than 2GHz, the slew rate of the sinewave signal becomes progressively too slow for the divider. † Input sensitivity and output power values assume 50 Ohm source and load impedances For details of the test set-up, refer to the Application Note for RF Prescalers. Zarlink Semiconductor Inc. 5 ZL40812 Data Sheet The following graph summarises the Input and Output Characteristics table Typical input sensitivity (sinewave drive) @ -40 to +85 Deg C 20.00 85 Deg C 70 Deg C 25 Deg C Vin into 50 Ohm (dBm) 10.00 0.00 GUARANTEED OPERATING WINDOW 85C 70 25C -40C MAX (Typ) -10.00 -20.00 Input frequency extends to DC if the source has an edgespeed of 900 V/us or less -30.00 -40.00 0 1 2 3 4 5 6 7 8 9 10 11 Input Frequency (GHz) Single Ended Output Power The following graphs show how the output power varies with supply. Differential output power will be 3dB. Figure 3 - Pout, Freq, Temp @ Vcc = 4.75V 6 Zarlink Semiconductor Inc. 12 13 ZL40812 Data Sheet Frequency_sweep, Vcc = 5v Device 1,Temperature = -40°C Device 1,Temperature = 25°C Device 1,Temperature = 85°C 5 4 3 2 1 0 -1 -3 -4 -5 -6 -7 -8 -9 -10 -11 -12 -13 -14 -15 0 2000000000 4000000000 6000000000 8000000000 10000000000 12000000000 14000000000 i/p frequency (Hz) Figure 4 - Pout, Freq, Temp @ Vcc = 5V Frequency_sweep, Vcc = 5.25v Device 1,Temperature = -40°C Device 1,Temperature = 85°C Device 1,Temperature = 25°C 3 2 o/p level (dBm) o/p level (dBm) -2 1 0 -1 -2 -3 -4 1000000000 10000000000 i/p frequency (Hz) Figure 5 - Pout, Freq, Temp @ Vcc = 5.25V Zarlink Semiconductor Inc. 7 ZL40812 Data Sheet Oscillographs of the Divider Output Waveforms The following oscillographs show that the low-level feedthrough of the input waveform can be further reduced by summing the two output pins of the device differentially, refer to Figure 6 and Figure 7. Figure 6 - Output waveform-single-ended VCC=5V, Vin=2dBm, Fin=10GHz Figure 7 - Output waveform - differential VCC=5V, Vin=2dBm, Fin=10GHz 8 Zarlink Semiconductor Inc. ZL40812 Data Sheet Figure 8 - Output waveform - differential VCC=4.75V, Vin=-10dBm, Fin=5GHz O t t f diff ti l Figure 9 - Output waveform - differential VCC=4.75V, Vin=-dBm, Fin=2GHz Zarlink Semiconductor Inc. 9 ZL40812 10 Data Sheet Zarlink Semiconductor Inc. For more information about all Zarlink products visit our Web Site at www.zarlink.com Information relating to products and services furnished herein by Zarlink Semiconductor Inc. trading as Zarlink Semiconductor or its subsidiaries (collectively “Zarlink”) is believed to be reliable. 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