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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
+85°C
July 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
1
Zarlink Semiconductor Inc.
Zarlink, ZL and the Zarlink Semiconductor logo are trademarks of Zarlink Semiconductor Inc.
Copyright 2003, Zarlink Semiconductor Inc. All Rights Reserved.
ZL40810
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
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
5
6
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 µF) 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 volt-
age transients on the power supply line.
2
Zarlink Semiconductor Inc.
ZL40810
Evaluation Boards From Zarlink Semiconductor
Data Sheet
Zarlink Semiconductor provides prescaler evaluation boards. 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, type No. ZLE40008. Fully populated
evaluation boards are also available, type No. ZLE40810. 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
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
T
ST
T
J
max
TH
ja
58.6
-65
6.5
V
Vp-p
V
+150
+125
°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
96
136
11
-8
-15
-10
8
11
-10
0
mA
mA
GHz
dBm
dBm
dBm
dBm
dBm
V/
µ
s
Input stage bias current
Divider and output stages
RMS sinewave
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.
1
-1
-147
50
55
1.2
Vp-p
dBm
dBc/Hz
%
3
Zarlink Semiconductor Inc.
ZL40810
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
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
67
54
74
60
80
62
0.35
96
78
105
86
115
91
125
101
136
111
149
119
mA
mA
mA
mA
mA
mA
mA
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)
4
Zarlink Semiconductor Inc.
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