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ZL40810 10-GHz Fixed Modulus / 8
Data Sheet Features
* * * * * * Very High Operating Speed Operation down to DC with Square Wave Input Low Phase Noise (Typically better than -147dBc/Hz at 10kHz) 5V Single Supply Operation Low Power Dissipation: 480mW (Typ) Surface Mount Plastic Package With Exposed Pad (See Application Notes) Ordering Information ZL40810/DCE (tubes) 8 lead e-pad SOIC ZL40810/DCF (tape and reel) 8 lead e-pad SOIC -40 to +85C
January 2003
Description
The ZL40810 is one of a range of 5V supply, very high speed low power prescalers for professional applications with a fixed modulus of divide by 8. 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 rise times. The output stage has internal 50 ohm pull up giving a 1V p-p output. See application notes for more details.
Applications
* * * * * * * DC to 10 GHz PLL applications HyperLan LMDS Instrumentation Satellite Communications Fibre Optic Communications; OC48, OC192 Ultra Low Jitter Clock Systems
VCC IN 1 50 Ohm
VCC OUT 8 OUTPUT 7 6 OUTPUT B Vref Div 8
400 Ohm INPUT 2 INPUT B 3 20mA
GND 4
GND 5
Figure 1 - Block Diagram
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ZL40810
Pin Connections - Top View
Vcc INPUT INPUT INPUT B GND 1 2 3 4
Data Sheet
8 7 6 5
Vcc OUTPUT OUTPUT OUTPUT B 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 2 C4:100pf 3 R1:50ohm C5:100pf 4 6 5 8 7 C6:10nF C7:10nF C2:10nF C1:10uF
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 F) 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.
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Zarlink Semiconductor Inc.
Data Sheet Evaluation Boards From Zarlink Semiconductor
ZL40810
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
Electrical Characteristics (Tamb = 25C, Vcc = 5V) Parameter 1 2 3 4 5 6 Supply voltage Prescaler Input Voltage ESD protection (Static Discharge) Storage temperature Maximum Junction Temp Thermal characteristics TST TJmax THja 58.6 Symbol Vcc 2.5 2k -65 +150 +125 Min Max 6.5 Units V Vp-p V C C C/W multi-layer PCB
AC/DC Electrical Characteristics
Electrical Characteristics (Tamb = 25C, Vcc = 5V) Characteristic Supply current Supply current Input frequency Input sensitivity Input sensitivity Input sensitivity Input overload Input overload Input Edge Speed Output voltage Output power Phase Noise (10kHz offset) O/P Duty Cycle Pin 1 8 2,3 2,3 2,3 2,3 2,3 2,3 2,3 6,7 6,7 6,7 6,7 45 -3 900 1 -1 -147 50 55 1.2 2 -8 -15 -10 8 11 -10 0 Min. Typ. 0.35 96 136 11 Max. Units mA mA GHz dBm dBm dBm dBm dBm V/s Vp-p dBm dBc/Hz % Conditions Input stage bias current Divider and output stages RMS sinewave1 fin = 1GHz to 2GHz fin = 2GHz to 9.5GHz fin = 11GHz fin = 1GHz to 4GHz fin = 5GHz to 11GHz For <2GHz operation. Differential Into 50ohm pullup resistors Single-ended output, fin = 2GHz to 10GHz, pwr ip= -10dBm Fin = 5GHz, pwr ip = 0dBm See Figure 5 to Figure 8.
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Data Sheet
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. The characteristics are guaranteed by either production test or design. Input sensitivity and output power values assume 50 Ohm source and load impedances
Typical input sensitivity (sinewave drive) @ +25 Deg C
20.00
10.00
Vin into 50 Ohm (dBm)
0.00
GUARANTEED OPERATING WINDOW
-10.00
25C MAX (Typ)
-20.00 Input frequency extends to DC if the source has an edge speed of 900 V/us or less -30.00
or more
-40.00 0 1 2 3 4 5 6 7 8 9 10 11 12 13 Input Frequency (GHz)
Figure 3 - Input Sensitivity @ +25 Deg C Electrical Characteristics (Vcc = 5V 5%, Tamb = -40 to +85C) Characteristic Supply current Supply current Supply current Supply current Supply current Supply current Supply current Pin 1 8 8 8 8 8 8 67 54 74 60 80 62 Min. Typ. 0.35 96 78 105 86 115 91 125 101 136 111 149 119 Max. Units mA mA mA mA mA mA mA Conditions Input stage bias current 1 -40 deg C 5.25V -40 deg C 4.75V +25 deg C 5.25V +25 deg C 4.75V +85 deg C 5.25V +85 deg C 4.75V
1. Pin 1 is the Vcc pin for the 1st 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). The characteristics are guaranteed by design and characterisation over the range of operating conditions unless otherwise stated: (Input Frequency range 1 to 10GHz rms Sinewave)
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Data Sheet
Input and Output Characteristics Characteristic Input sensitivity Input overload Input overload Input overload Input overload Input Edge Speed Output voltage Output power O/P Duty Cycle Trise and Tfall Pin 2,3 2,3 2,3 2,3 2,3 2,3 6,7 6,7 6,7 6,7 -4 45 2 2 5 5 900 1 -1 50 110 2 55 Min. Typ. -15 5 8 13 11 Max. -10 Units dBm dBm dBm dBm dBm V/s Vp-p dBm % ps Conditions
ZL40810
Tamb = 85C, Fin = 2 to 8 GHz fin = 2 GHz fin = 4 GHz fin = 9 GHz fin = 10 GHz For <2GHz operation1. Differential Into 50ohm pullup resistors Single-ended output, fin = 2GHz to 10GHz, pwr ip= -10dBm
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.
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ZL40810
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
Data Sheet
10.00
Vin into 50 Ohm (dBm)
0.00
GUARANTEED OPERATING WINDOW
-10.00
85C 70 25C -40C MAX (Typ)
-20.00 Input frequency extends to DC if the source has an edgespeed of 900 V/us or more or less -30.00
-40.00 0 1 2 3 4 5 6 7 8 9 10 11 12 13 Input Frequency (GHz)
Figure 4 - Input Sensitivity @ -40, +25, +70 and +85 Deg C
Phase Noise Measurement Graphs
The following graph show how the phase noise of the divider output varies with frequency offset from the output (carrier) frequency.
ZL40810 Phase Noise vs Offset Pin = 0dBm, Vcc = 5.25V, Temp = 25DegC
Phase Noise (dBc/Hz) -130 -135 -140 -145 -150 1 10 Offset Frequency (kHz)
Figure 5 - Figure 8 ZL40810 Phase Noise vs Offset Frequency
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10GHz 5GHz 2GHz
100
Data Sheet
ZL40810
The following graph show how the phase noise of the divider output varies with input frequency. The output frequency is the input divided by 8.
ZL40810 Phase Noise vs Input Frequency Pin = 0dBm, Vcc = 5.25V, Temp = 25 Deg C
-120 -125 -130 -135 -140 -145 -150 -155 -160 2 4 6 Input Frequency (GHz)
Figure 6 - ZL40810 Phase Noise vs Input Frequency The following graph show how the phase noise of the divider output varies with input power.
Phase Noise (dBc/Hz)
100Hz 1kHz 10kHz 100kHz
8
10
ZL40810 Phase Noise vs Input Power Vcc = 5.25V, Input Frequency = 5GHz, T = 25 DegC
Phase Noise (dBc/Hz) -130 -135 -140 -145 -150 -155 -4 -3 -2 -1 0 1 2 3 Input Power (dBm)
Figure 7 - ZL40810 Phase Noise vs Input Power
100Hz 1kHz 10kHz 100kHz
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ZL40810
Data Sheet
The following graph show how the phase noise of the divider output varies with power supply voltage Vcc.
ZL40810 Phase Noise vs Vcc Fin = 5GHz, Pin = 0dBm, T = 25DegC
Phase Noise (dBc/Hz) -130 -135 -140 -145 -150 -155 4.5 4.75 5 Supply Voltage (V)
Figure 8 - ZL40810 Phase Noise vs Vcc
100Hz 1kHz 10kHz 100kHz
5.25
5.5
Single Ended Output Power
The following graphs show how the output power varies with supply. Differential output power will be 3dB.
Frequency_sweep, Vcc = 4.75v Device 1,Temperature = -40C 5 4 3 2 1 0 -1 -2 o/p level (dBm) -3 -4 -5 -6 -7 -8 -9 -10 -11 -12 -13 -14 -15 0 2000000000 4000000000 6000000000 8000000000 10000000000 12000000000 14000000000 i/p frequency (MHz) ZL40810 Devcie1 Minimum inband power output. -2.9dBm Device 1,Temperature = 25C Device 1,Temperature = 85C
Figure 9 - Pout, Freq, Temp @ Vcc = 4.75
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Data Sheet
ZL40810
Frequency_sweep, Vcc = 5v Device 1,Temperature = -40C 5 4 3 2 1 0 -1 -2 o/p level (dBm) -3 -4 -5 -6 -7 -8 -9 -10 -11 -12 -13 -14 -15 0 2000000000 4000000000 6000000000 8000000000 10000000000 12000000000 14000000000 i/p frequency (MHz) Device 1,Temperature = 25C Device 1,Temperature = 85C
Figure 10 - Pout, Freq, Temp @ Vcc = 5V
Frequency_sweep, Vcc = 5.25v Device 1,Temperature = -40C 5.00E+00 4.00E+00 3.00E+00 2.00E+00 1.00E+00 0.00E+00 -1.00E+00 -2.00E+00 o/p level (dBm) -3.00E+00 -4.00E+00 -5.00E+00 -6.00E+00 -7.00E+00 -8.00E+00 -9.00E+00 -1.00E+01 -1.10E+01 -1.20E+01 -1.30E+01 -1.40E+01 -1.50E+01 0 2000000000 4000000000 6000000000 8000000000 10000000000 12000000000 14000000000 i/p frequency (MHz) Device 1,Temperature = 25C Device 1,Temperature = 85C
Figure 11 - Pout, Freq, Temp @ Vcc = 5.25V
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ZL40810
Oscillographs of the divider output waveforms
Data Sheet
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 Figures 6 and 7.
Figure 12 - Feedthough of the input single-ended output configuration (VCC=5, Vin = 2dBm, Fin = 10GHz)
Figure 13 - Feedthrough of the input using differential output configuration (VCC = 5V, Vin = 2dBm, Fin = 10GHz)
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Data Sheet
Figures 8 and 9 show the output waveforms with a lower input frequency.
ZL40810
Figure 14 - Differential output with small input amplitude (VCC = 4.75V, Vin = -10dBm, Fin = 5GHz)
Figure 15 - Differential output with lower input frequency (VCC = 4.75V, Vin = -10dBm, Fin = 2GHz)
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ZL40810
Data Sheet
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Zarlink Semiconductor Inc.
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