ZL40803
6 GHz Fixed Modulus
÷
2
Data Sheet
Features
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3.45V Single Supply Operation
Low Power Dissipation: 250mW typ
Broadband: DC to 6GHz
SSB Phase Noise: –147dBc/Hz @ 10KHz
Pout 0dBm
Surface Mount Plastic Package: 8 SOIC
Ordering Information
ZL40803/DCA (tubes)
8 pin SOIC
ZL40803/DCB (tape and reel) 8 pin SOIC
-40°C to +85°C
July 2003
Prescaler Modulus
ZL40803 – Divide by 2
Description
The ZL40803 are Bipolar 3.45V supply, very low power
prescalers for professional applications with a fixed
modulus of 2. The ultra low close in (1KHz offset) SSB
phase noise performance is ideal for narrow band
communications systems or systems with ultra low jitter
budgets such as next generation fibre optic
communications. The devices are broadband from DC
to 6GHz.
See Figure 1 and Application Note for RF Prescalers for
more details.
Applications
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DC to 6 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 N
400 Ohm
INPUT
2
INPUT B
3
20mA
GND
4
GND
5
Figure 1 - Functional Block Diagram
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Zarlink, ZL and the Zarlink Semiconductor logo are trademarks of Zarlink Semiconductor Inc.
Copyright 2003, Zarlink Semiconductor Inc. All Rights Reserved.
ZL40803
Data Sheet
Vcc IN
INPUT
INPUT Bar
GND
1
2
3
4
8
7
6
5
Vcc OUT
OUTPUT
OUTPUT Bar
GND
SOIC (N)
Figure 2 - Pin Connections – Top View
Application Configuration
Figure 3 shows a recommended application configuration. This example shows the device set up for single ended
operation.
Application Diagram
C1: 1nF
Rfilter
C2: 10nF
Vcc
8
7
6
5
C5: 10nF
C3: 100pF
Rsource:
C4: 100pF
1
2
3
4
C6: 10nF
Rload
Note: Dotted Components Optional
Figure 3 - Recommended circuit configuration
This represents the circuit used to complete characterisation. The tabulated Electrical performance is guaranteed
using this application circuit.
Unpopulated evaluation boards are available, type No. ZLE40008. A fully populated evaluation board is also
available, type No. ZLE40803.
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Zarlink Semiconductor Inc.
ZL40803
Circuit Options
Data Sheet
The application circuit includes some optional components that may be required to improve tolerance of system
noise present in the application.
Dummy R source
may be added to the inverting input to provide a better matched source impedance at the input.
This will improve the rejection of common mode noise present within the system.
Dummy R load
may be added to the inverting output to provide better matched load at the output. This will reduce
the radiated EMI at the output and reduce the Output Noise present on the supply rail.
Rfilter
can be inserted between the Vcc in and the Vcc_out to provide additional filtering to the input Vcc. The input
Vcc powers the input bias reference only and can be a sensitive point to system noise. The nominal input current at
Vcc_IN s 0.35mA. An alternative would be to use an inductive choke.
C1
is additional Supply Filtering and should be added with Rfilter. The IC includes 10pF of on Chip Supply Filtering.
Input & Output Circuit
Figure 4 shows the equivalent input and output circuit
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Vcc_Out
Vcc_In
Vref
I/O Circuits
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50 Ohm
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50 Ohm
•
0.5pF
0.5pF
400 Ohm
400 Ohm
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1.0nH
1.0nH
Output
Input
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Input bar
1.0nH
0.2pF
1.0nH
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0.8pF
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20mA
10mA
Output Bar
Gnd
Gnd
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Figure 4 - Input and Output Equivalent Circuit
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Zarlink Semiconductor Inc.
ZL40803
Data Sheet
ZL40803 Phase Noise / Offset Frequency
T = 25C, Vcc =3.6V, Pin = -6dBm
Phase Noise in dBC/Hz
-125
-130
-135
-140
-145
-150
-155
100
1000
10000
5GHz
3GHz
1GHz
Frequency in Hz
Figure 5 - ZL40803 Typical Phase Noise
Absolute Maximum Ratings
Characteristic
Supply Voltage (Vcc)
RFin
All I/O ports
Storage Temperature
ESD protection
Operating Range
Characteristic
Supply Voltage (Vcc)
RFin Frequency Range
Operating Junction Temperature
Junc’n to Amb’t resistance Theta Ja
Junc’n to Case resistance Theta Jc
Min
3.3
0.1
-40
150
60
Typ
Max
3.6
6
+125
Units
V
GHz
°C
°C/W
°C/W
4 layer FR4 Board
4 layer FR4 Board
Comments
-0.5V
-55
2KV
Min
- 0.5
Max
6
12
Vcc+0.5
150
Units
V
dBm
V
°C
Mil-std 883B / 3015 cat1
Comments
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Zarlink Semiconductor Inc.
ZL40803
AC/DC Electrical Characteristics
Electrical Characteristics
†
Characteristic
Icc_in (Supply current)
Icc_out (Supply current)
Input frequency
Input sensitivity
Input overload
Phase Noise
Output voltage
Output power
Output t-rise
Output t-fall
T – prop delay
Jitter
Output Duty Cycle
Input. Edge Speed
Pin
1
8
2,3
2,3
2,3
6,7
6,7
6,7
6,7
6,7
2,6
6,7
6,7
2,3
45
500
-7
4
44
1
-20
10
-150
1
-2
110
110
250
0.1
50
55
2
Min.
Typ.
0.35
72
110
6
-10
Max.
Units
mA
mA
GHz
dBm
dBm
dBC/Hz
Vp-p
dBm
ps
ps
ps
ps
%
V/us
RMS sinewave,
Data Sheet
Conditions
fin = 1GHz to 6GHz, Note1
fin = 1GHz to 6GHz, Note1
@ 10KHz Offset Fin = 3GHz
Differential Into 50 ohm pull up
resistors
fin = 1GHz to 6GHz, Pin = -10dBm,
Note 2
fin = 1GHz to 6GHz, Pin = -10dBm
fin = 1GHz to 6GHz, Pin = -10dBm
50% IN to 50% OUT
fin = 1GHz to 6GHz, In = -10dBm
For < 1GHz input operation
† These characteristics are guaranteed by design and characterisation over the following range of operating conditions unless otherwise stated:
Tamb = -40C to + 85C, Vcc = 3.3V to 3.6V.
Note 1: Pin = power measured into 50 ohm Load from 50 ohm Source.
Note 2:
Pout Single Ended AC coupled Single 50 Ohm Termination.
For details of the test set-up, refer to the Application Note for RF Prescalers.
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