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ZL40812 10GHz Fixed Modulus / 16
Data Sheet Features
* * * * * * Very High Operating Speed Operation down to DC with Square Wave Input Low Phase Noise (Typically better than -152dBc/Hz at 10kHz) 5V Single Supply Operation Low Power Dissipation: 500mW (Typ) Surface Mount Plastic Package With Exposed Pad (See Application Notes
January 2003
Ordering Information ZL40812/DCE (tubes) 8 lead e-pad SOIC ZL40812/DCF (tape and reel) 8 lead e-pad SOIC -40C to +85C
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
* * * * * * * 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 16
400 Ohm INPUT 2 INPUT B 3 20mA
GND 4
GND 5
Figure 1 - Block Diagram
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ZL40812
Pin Connection - Top View
Vcc INPUT INPUT INPUT B GND 1 2 3 4 8 7 6 5 Vcc OUTPUT OUTPUT OUTPUT B GND
Data Sheet
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
ZL40812
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 1 2 3 4 5 6 Supply Voltage Prescaler Input Voltage ESD protection (Static Discharge) Storage temperature Maximum Junction Temp Thermal Characteristics Thja TST -65 Symbol Vcc Min Max 6.5V 2.5 2 150 125 58.6 Vp-p kV C C C/W multi-layer PCB Units
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
Note 1:
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
Min.
Typ. 0.35 100
Max.
Units mA
Conditions 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 5 to Figure 8.
130 11
mA GHz dBm dBm dBm dBm dBm V/is Vp-p
2 -8 -15 -10 8 11 900 1 -3 -1 -152 45 50
-10 0
1.2
dBm dBc/Hz
55
%
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.
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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)
Figure 3 - Input Sensitivity @ +25 Deg C
Electrical Characteristics
Characteristics Supply current Supply current Supply current Supply current Supply current Supply current Supply current
Note 1:
(Vcc = 5V 5%, Tamb = -40 to +85C)
Pin 1 8 8 8 8 8 8
Min.
Typ. 0.35
Max.
Units mA
Conditions 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
70 57 78 63 84 65
99 80 109 88 119 94
127 103 140 114 153 123
mA mA mA mA mA mA
Pin 1 is the Vcc pin for the 1 st 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)
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Zarlink Semiconductor Inc.
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
Note 1:
ZL40812
Pin 2,3 2,3 2,3 2,3 2,3 2,3 6,7 6,7 6,7 6,7
Min.
Typ. -15
Max. -10
Units dBm dBm dBm dBm dBm V/is Vp-p
Conditions 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
2 2 5 5 900
5 8 13 11 1
-4 45
-1 50 110
2 55
dBm % ps
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. The following graph summarizes 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
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 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
Zarlink Semiconductor Inc.
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ZL40812
Phase Noise Measurement Graphs
Data Sheet
The following graph show how the phase noise of the divider output varies with frequency offset from the output (carrier) frequency.
ZL40812 Phase Noise vs Offset Pin = 0dBm, Vcc = 4.75V, Temp = 25 DegC
Phase Noise in (dBc/Hz) -130 -135 -140 -145 -150 -155 -160 0.1 1 10 100 Offset Frequency (kHz)
Figure 5 - ZL40812 Phase Noise vs Offset Frequency The following graph show how the phase noise of the divider output varies with input frequency. The output frequency is the input divided by 16.
10GHz 5GHz 2GHz
ZL40812:Phase Noise vs Input Frequency Pin = 0dBm, Vcc = 5.25V, 25 DegC
-120 -125 Phase Noise (dBc/Hz) -130 -135 -140 -145 -150 -155 -160 2 4 6 Input Frequency (GHz) 8 10 100Hz 1kHz 10kHz 100kHz
Figure 6 - ZL40812 Phase Noise vs Input Frequency
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Zarlink Semiconductor Inc.
Data Sheet
The following graph show how the phase noise of the divider output varies with input power.
ZL40812
ZL40812: Phase Noise vs Input Power Vcc = 5.25V, Input Frequency = 5GHz, T = 25 DegC
Phase Noise (dBc/Hz) -140 -145 -150 -155 -160 -10 -5 0 5 Input Power (dBm)
Figure 7 - ZL40812 Phase Noise vs Input Power The following graph show how the phase noise of the divider output varies with power supply voltage Vcc.
100 Hz 1 KHz 10 KHz 100 KHz
ZL40812: Phase Noise v Vcc Fin = 5GHz, Pin = 0dBm T = 25 DegC
-120 -125 -130 -135 -140 -145 -150 -155 -160 4.7 4.8 4.9 5 5.1 5.2 5.3 Supply Voltage (V)
Figure 8 - ZL40812 Phase Noise vs Vcc
Phase Noise (dBc/Hz)
100Hz 1kHz 10kHz 100kHz
Zarlink Semiconductor Inc.
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ZL40812
Single Ended Output Power
The following graphs show how the output power varies with supply. Differential output power will be 3dB.
Data Sheet
Frequency_sweep, Vcc = 4.75v Device 1,Temperature = -40C Device 1,Temperature = 85C 3 2 o/p level (dBm) 1 0 -1 -2 -3 -4 1000000000 i/p frequency (Hz) 10000000000 Device 1,Temperature = 25C
Figure 9 - Pout, Freq, Temp @ Vcc = 4.75V
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 (Hz) Device 1,Temperature = 25C Device 1,Temperature = 85C
Figure 10 - Pout, Freq, Temp @ Vcc = 5V
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Zarlink Semiconductor Inc.
Data Sheet
ZL40812
Frequency_sweep, Vcc = 5.25v Device 1,Temperature = -40C Device 1,Temperature = 85C 3 2 o/p level (dBm) 1 0 -1 -2 -3 -4 1000000000 i/p frequency (Hz) 10000000000 Device 1,Temperature = 25C
Figure 11 - Pout, Freq, Temp @ Vcc = 5.25V
Zarlink Semiconductor Inc.
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ZL40812
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 Figure 12 and Figure 13.
Figure 12 - Output waveform-single-ended VCC=5V, Vin=2dBm, Fin=10GHz
Figure 13 - Output waveform - differential VCC=5V, Vin=2dBm, Fin=10GHz
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Zarlink Semiconductor Inc.
Data Sheet
ZL40812
Figure 14 - Output waveform - differential VCC=4.75V, Vin=-10dBm, Fin=5GHz
Figure 15 - Output waveform - differential VCC=4.75V, Vin=-dBm, Fin=2GHz
Zarlink Semiconductor Inc.
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ZL40812
Data Sheet
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Zarlink Semiconductor Inc.
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