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ZL40815 10GHz Fixed Modulus / 4
Data Sheet Features
* * * * * * Very High Operating Speed Operation down to DC with Square Wave Input Low Phase Noise (Typically better than -146dBc/Hz at 10kHz) 5V Single Supply Operation Low Power Dissipation: 510mW (Typ) Surface Mount Plastic Package With Exposed Pad (See Application Notes) Ordering Information ZL40815/DCE (tubes) 8 lead e-pad SOIC ZL40815/DCF (tape and reel) 8 lead e-pad SOIC -40C to +85C
January 2003
Description
The ZL40815 is one of a range of 5V supply, very high speed, low power prescalers for professional applications with a fixed modulus of divide by 4. 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
* * * * * * * 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 4
400 Ohm INPUT 2 INPUT B 3 20mA
GND 4
GND 5
Figure 1 - Block Diagram
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ZL40815
Pin Connections - Top View
Vcc INPUT INPUT INPUT B GND
Data Sheet
1 2 3 4
8 7 6 5
Vcc OUTPUT OUTPUT OUTPUT B GND
SOIC (N) E-Pad
Applications Configuration
Figure 2 shows a recommended application configuration. This example shows the devices set up for single ended operation.
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
Vcc 5V
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
ZL40815
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 Min Max Units
1 2 3 4 5 6
Supply voltage Prescaler Input Voltage ESD protection (Static Discharge) Storage temperature Maximum Junction Temp Thermal characteristics
Vcc 2.5 2k TST TJmax THja 58.6 -65
6.5 (Vdd_IO+5%) +150 +125
V Vp-p V C C C/W multi-layer PCB
AC/DC Electrical Characteristics
Electrical Characteristics (Tamb = 25C, Vcc = 5V) Characteristic Pin Min. Typ. Max. Units Conditions
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
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 2
0.35 102 130 11 -8 -15 -10 8 11 -10 0
mA mA GHz dBm dBm dBm dBm dBm V/is
Input stage bias current Divider and output stages RMS sinewave, see Note 1 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 7 and Figure 8.
1 -1 -146 50 55 1.2
Vp-p dBm dBc/Hz %
The following characterization test method incremented the amplitude over the entire range of frequency and ensures that there are no "holes" in the characteristic. The following characteristics are guaranteed by either production test or design. Note 1: Input sensitivity and output power values assume 50 Ohm source and load impedances.
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ZL40815
Data Sheet
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 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 3 - Input Sensitivity @ +25 Deg C
Electrical Characteristics (Vcc = 5V 5%, Tamb = -40 to +85C)
Characteristic Pin Min. Typ. Max. Units Conditions
Supply current Supply current Supply current Supply current Supply current Supply current Supply current
1 8 8 8 8 8 8 73 59 81 65 87 67
0.35 102 83 112 91 121 96 131 106 142 116 156 125
mA mA mA mA mA mA mA
Input stage bias current, see Note 1 -40 degC 5.25V -40 degC 4.75V +25 degC 5.25V +25 degC 4.75V +85 degC 5.25V +85 degC 4.75V
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) Note 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 9).
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Data Sheet
Input and Output Characteristics Characteristic Pin Min. Typ. Max. Units Conditions
ZL40815
Input sensitivity Input overload Input overload Input overload Input overload Input Edge Speed Output voltage Output power O/P Duty Cycle Trise and Tfall
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
-15 5 8 13 11
-10
dBm dBm dBm dBm dBm V/is
Tamb = 85C, Fin = 2 to 8 GHz fin = 2 GHz fin = 4 GHz fin = 9 GHz fin = 10 GHz For <2GHz Operation, see Note 1 Differential Into 50ohm pullup resistors Single-ended output, fin = 2GHz to 10GHz, pwr ip= -10dBm
1 -1 50 110 2 55
Vp-p dBm % ps
Note 1: Input sensitivity and output power values assume 50 Ohm source and load impedances. 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.
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ZL40815
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
ZL40815 Phase Noise vs Offset Pin = 0dBm, Vcc = 5.25V, Temp = 25DegC
Phase Noise (dBc/Hz) -130 -135 -140 -145 -150 0.1 1 10 100 Offset Frequency (kHz) 5GHz 2GHz
Figure 5 - ZL40815 Phase Noise vs Offset Frequency
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Zarlink Semiconductor Inc.
Data Sheet
ZL40815
ZL40815 Phase Noise vs Input Frequency Pin = 0dBm, Vcc = 5.25V, Temp = 25 DegC
Phase Noise (dBc/Hz) -130 -135 -140 -145 -150 0 1 2 3 4 5 6 Input Frequency (GHz) 100Hz 1kHz 10kHz 100kHz
Figure 6 - ZL40815 Phase Noise vs Input Frequency
Single Ended Output Power
The following graphs show how the output power varies with supply. Differential output power will be 3dB.
ZL8015_dev1_Pout_Frequency_sweep, Vcc = 4.75v Device 1,Temperature = -40C Device 1,Temperature = 85C 2 1 0 -1 -2 -3 -4 -5 -6 1000000000 i/p frequency (Hz) Device 1,Temperature = 25C
o/p level (dBm)
10000000000
Figure 7 - Pout, Freq, Temp @ Vcc = 4.75V
Zarlink Semiconductor Inc.
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ZL40815
Data Sheet
Frequency_sweep, Vcc = 5v Device 1,Temperature = -40C Device 1,Temperature = 85C
5 4 3 2 1 0 -1 -2 -3 -4 -5 -6 -7 -8 -9 -10 -11 -12 -13 -14 -15
Device 1,Temperature = 25C
o/p level (dBm)
1000000000 i/p frequency (MHz)
10000000000
Figure 8 - Pout, Freq, Temp @ Vcc = 5V
ZL40815_Pout_Frequency_sweep, Vcc = 5.25v Device 1,Temperature = -40C Device 1,Temperature = 85C 2 1 0 -1 -2 -3 -4 -5 -6 1000000000 i/p frequency (Hz) Device 1,Temperature = 25C
o/p level (dBm)
10000000000
Figure 9 - Pout, Freq, Temp @ Vcc = 5.25V
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Zarlink Semiconductor Inc.
Data Sheet Oscillographs of the divider output waveforms
ZL40815
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 10 and Figure 11.
Figure 10 - Feedthrough of the input single-ended-output configuration VCC = 5V, Vin = 2dBm, Fin = 10GHz
Figure 11 - Feedthrough of the input using differential output configuration VCC = 5V, Vin = 2dBm, Fin = 10GHz
Zarlink Semiconductor Inc.
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ZL40815
Figure 12 and Figure 13 show the output waveforms with a lower input frequency.
Data Sheet
Figure 12 - Differential output with small input amplitute waveform VCC = 4.75V, Vin = 10dBm, Fin = 5GHz
Figure 13 - Differential output with lower frequency input VCC = 4.75V, Vin = 10dBm, Fin = 2GHz
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Zarlink Semiconductor Inc.
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