ZL40803 Datasheet, PDF (3/12 Pages) Zarlink Semiconductor Inc – 6 GHz FIXED MODULUS DEVIDE 2

ZL40803
Data Sheet
Circuit Options
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
•
Vcc_In
Vref
I/O Circuits ^•
0.5pF
Input
1.0nH
•
•
•
0.2pF
•
Input bar ^1.0nH
0.8pF
•
•
•
•
Gnd
••
•
0.5pF
Vcc_Out
•_• • •
Output
1.0nH
1.0nH
Output Bar
1²0⁰m^mA^A
•
Gnd
Figure 4 - Input and Output Equivalent Circuit
3
Zarlink Semiconductor Inc.