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.
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)
Applications
DC to 10 GHz PLL applications
HyperLan
LMDS
Instrumentation
Satellite Communications
Fibre Optic Communications; OC48, OC192
Ultra Low Jitter Clock Systems
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.
July 2003
Ordering Information
ZL40810/DCE (tubes)
8 lead e-pad SOIC
ZL40810/DCF (tape and reel) 8 lead e-pad SOIC
-40
to
+
85
C
ZL40810
10-GHz Fixed Modulus
8
Data Sheet
Figure 1 - Block Diagram
Vref
Div 8
20mA
50 Ohm
400 Ohm
VCC IN
VCC OUT
OUTPUT
OUTPUT B
INPUT
INPUT B
GND
GND
1
2
3
4
8
7
6
5
ZL40810
Data Sheet
2
Zarlink Semiconductor Inc.
Pin Connections - Top View
Application Configuration
Figure 2 shows a recommended application configuration. This example shows the devices set up 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 volt-
age transients on the power supply line.
Vcc INPUT
INPUT
INPUT B
GND
Vcc OUTPUT
OUTPUT
OUTPUT B
GND
1
2
3
4
5
6
7
8
SOIC (N) E-Pad
1
8
7
2
3
6
5
4
C2:10nF
C4:100pf
C5:100pf
C6:10nF
C7:10nF
Vcc 5V
Example Configuration for Single ended operation
C1:10uF
R2:50ohm
R1:50ohm
C3:100pF
R3:100ohm
C8:10nF
ZL40810
Data Sheet
3
Zarlink Semiconductor Inc.
Evaluation Boards From Zarlink Semiconductor
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
AC/DC Electrical Characteristics
Electrical Characteristics
(Tamb = 25C, Vcc = 5V)
Parameter
Symbol
Min
Max
Units
1
Supply voltage
Vcc
6.5
V
2
Prescaler Input Voltage
2.5
Vp-p
3
ESD protection (Static Discharge)
2k
V
4
Storage temperature
T
ST
-65 +150
C
5
Maximum Junction Temp
T
J
max
+125
C
6
Thermal characteristics
TH
ja
58.6
C/W
multi-layer PCB
Electrical Characteristics
(Tamb = 25C, Vcc = 5V)
Characteristic
Pin
Min.
Typ.
Max.
Units
Conditions
Supply current
1
0.35
mA
Input stage bias current
Supply current
8
96
136
mA
Divider and output stages
Input frequency
2,3
2
11
GHz
RMS sinewave
1
Input sensitivity
2,3
-8
dBm
fin = 1GHz to 2GHz
Input sensitivity
2,3
-15
-10
dBm
fin = 2GHz to 9.5GHz
Input sensitivity
2,3
-10
0
dBm
fin = 11GHz
Input overload
2,3
8
dBm
fin = 1GHz to 4GHz
Input overload
2,3
11
dBm
fin = 5GHz to 11GHz
Input Edge Speed
2,3
900
V/
s
For <2GHz operation.
Output voltage
6,7
1
Vp-p
Differential Into 50ohm pullup
resistors
Output power
6,7
-3
-1
1.2
dBm
Single-ended output, fin = 2GHz to
10GHz, pwr ip= -10dBm
Phase Noise (10kHz
offset)
6,7
-147
dBc/Hz
Fin = 5GHz, pwr ip = 0dBm
See Figure 5 to Figure 8.
O/P Duty Cycle
6,7
45
50
55
%
ZL40810
Data Sheet
4
Zarlink Semiconductor Inc.
Figure 3 - Input Sensitivity @ +25 Deg C
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
Electrical Characteristics
(Vcc = 5V 5%, Tamb = -40 to +85C)
Characteristic
Pin
Min.
Typ.
Max.
Units
Conditions
Supply current
1
0.35
mA
Input stage bias current
1
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)
Supply current
8
67
96
125
mA
-40 deg C 5.25V
Supply current
8
54
78
101
mA
-40 deg C 4.75V
Supply current
8
74
105
136
mA
+25 deg C 5.25V
Supply current
8
60
86
111
mA
+25 deg C 4.75V
Supply current
8
80
115
149
mA
+85 deg C 5.25V
Supply current
8
62
91
119
mA
+85 deg C 4.75V
Typical input sensitivity (sinewave drive) @ +25 Deg C
-40.00
-30.00
-20.00
-10.00
0.00
10.00
20.00
0
1
2
3
4
5
6
7
8
9
10
11
12
13
Input Frequency (GHz)
Vi
n
i
n
to
50 Oh
m (d
B
m
)
25C
MAX (Typ)
GUARANTEED
OPERATING WINDOW
Input frequency extends to DC if the
source has an edge speed of 900 V/us or less
or more
ZL40810
Data Sheet
5
Zarlink Semiconductor Inc.
For details of the test set-up, refer to the Application Note for RF Prescalers.
Input and Output Characteristics
Characteristic
Pin
Min.
Typ.
Max.
Units
Conditions
Input sensitivity
2,3
-15
-10
dBm
Tamb = 85C, Fin = 2 to 8 GHz
Input overload
2,3
2
5
dBm
fin = 2 GHz
Input overload
2,3
2
8
dBm
fin = 4 GHz
Input overload
2,3
5
13
dBm
fin = 9 GHz
Input overload
2,3
5
11
dBm
fin = 10 GHz
Input Edge Speed
2,3
900
V/
s
For <2GHz operation
1
.
Output voltage
6,7
1
Vp-p
Differential Into 50ohm pullup
resistors
Output power
6,7
-4
-1
2
dBm
Single-ended output, fin = 2GHz to
10GHz, pwr ip= -10dBm
O/P Duty Cycle
6,7
45
50
55
%
Trise and Tfall
6,7
110
ps
1. 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
ZL40810
Data Sheet
6
Zarlink Semiconductor Inc.
The following graph summarises the Input and Output Characteristics table
Figure 4 - Input Sensitivity @ -40, +25, +70 and +85 Deg C
Phase Noise Measurement Graphs
The following graph show how the phase noise of the divider output varies with frequency offset from the output
(carrier) frequency.
Figure 5 - Figure 8 ZL40810 Phase Noise vs Offset Frequency
Typical input sensitivity (sinewave drive) @ -40 to +85 Deg C
-40.00
-30.00
-20.00
-10.00
0.00
10.00
20.00
0
1
2
3
4
5
6
7
8
9
10
11
12
13
Input Frequency (GHz)
Vin
in
t
o
50 O
h
m
(
d
B
m
)
85C
70
25C
-40C
MAX (Typ)
GUARANTEED
OPERATING WINDOW
85 Deg C
70 Deg C
25 Deg C
Input frequency extends to DC if the
source has an edgespeed of 900 V/us or less
or more
ZL40810 Phase Noise vs Offset
Pin = 0dBm, Vcc = 5.25V, Temp = 25DegC
-150
-145
-140
-135
-130
1
10
100
Offset Frequency (kHz)
P
h
a
s
e
N
o
is
e
(
d
B
c
/H
z
)
10GHz
5GHz
2GHz
ZL40810
Data Sheet
7
Zarlink Semiconductor Inc.
The following graph show how the phase noise of the divider output varies with input frequency. The output
frequency is the input divided by 8.
Figure 6 - ZL40810 Phase Noise vs Input Frequency
The following graph show how the phase noise of the divider output varies with input power.
Figure 7 - ZL40810 Phase Noise vs Input Power
ZL40810 Phase Noise vs Input Frequency
Pin = 0dBm, Vcc = 5.25V, Temp = 25 Deg C
-160
-155
-150
-145
-140
-135
-130
-125
-120
2
4
6
8
10
Input Frequency (GHz)
P
h
ase N
o
i
s
e
(d
B
c
/
H
z
)
100Hz
1kHz
10kHz
100kHz
ZL40810 Phase Noise vs Input Power
Vcc = 5.25V, Input Frequency = 5GHz, T = 25 DegC
-155
-150
-145
-140
-135
-130
-4
-3
-2
-1
0
1
2
3
Input Power (dBm)
P
h
a
se N
o
i
s
e (
d
B
c
/
H
z
)
100Hz
1kHz
10kHz
100kHz
ZL40810
Data Sheet
8
Zarlink Semiconductor Inc.
The following graph show how the phase noise of the divider output varies with power supply voltage Vcc.
Figure 8 - ZL40810 Phase Noise vs Vcc
Single Ended Output Power
The following graphs show how the output power varies with supply.
Differential output power will be 3dB.
Figure 9 - Pout, Freq, Temp @ Vcc = 4.75
ZL40810 Phase Noise vs Vcc
Fin = 5GHz, Pin = 0dBm, T = 25DegC
-155
-150
-145
-140
-135
-130
4.5
4.75
5
5.25
5.5
Supply Voltage (V)
P
h
ase
N
o
i
s
e (d
B
c
/
H
z
)
100Hz
1kHz
10kHz
100kHz
Frequency_sweep, Vcc = 4.75v
-15
-14
-13
-12
-11
-10
-9
-8
-7
-6
-5
-4
-3
-2
-1
0
1
2
3
4
5
0
2000000000
4000000000
6000000000
8000000000
10000000000
12000000000
14000000000
i/p frequency (MHz)
o/
p l
e
v
e
l
(
d
Bm
)
Device 1,Temperature = -40C
Device 1,Temperature = 25C
Device 1,Temperature = 85C
ZL40810 Devcie1
Minimum inband power output.
-2.9dBm
ZL40810
Data Sheet
9
Zarlink Semiconductor Inc.
Figure 10 - Pout, Freq, Temp @ Vcc = 5V
Figure 11 - Pout, Freq, Temp @ Vcc = 5.25V
Frequency_sweep, Vcc = 5v
-15
-14
-13
-12
-11
-10
-9
-8
-7
-6
-5
-4
-3
-2
-1
0
1
2
3
4
5
0
2000000000
4000000000
6000000000
8000000000
10000000000
12000000000
14000000000
i/p frequency (MHz)
o/
p l
e
v
e
l
(
d
Bm
)
Device 1,Temperature = -40C
Device 1,Temperature = 25C
Device 1,Temperature = 85C
Frequency_sweep, Vcc = 5.25v
-1.50E+01
-1.40E+01
-1.30E+01
-1.20E+01
-1.10E+01
-1.00E+01
-9.00E+00
-8.00E+00
-7.00E+00
-6.00E+00
-5.00E+00
-4.00E+00
-3.00E+00
-2.00E+00
-1.00E+00
0.00E+00
1.00E+00
2.00E+00
3.00E+00
4.00E+00
5.00E+00
0
2000000000
4000000000
6000000000
8000000000
10000000000
12000000000
14000000000
i/p frequency (MHz)
o/
p l
e
v
e
l
(
d
Bm
)
Device 1,Temperature = -40C
Device 1,Temperature = 25C
Device 1,Temperature = 85C
ZL40810
Data Sheet
10
Zarlink Semiconductor Inc.
Oscillographs of the divider output waveforms
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 Figures 6 and 7.
Figure 12 - Feedthough of the input single-ended output configuration
(VCC=5, Vin = 2dBm, Fin = 10GHz)
Figure 13 - Feedthrough of the input using differential output configuration
(VCC = 5V, Vin = 2dBm, Fin = 10GHz)
ZL40810
Data Sheet
11
Zarlink Semiconductor Inc.
Figures 8 and 9 show the output waveforms with a lower input frequency.
Figure 14 - Differential output with small input amplitude
(VCC = 4.75V, Vin = -10dBm, Fin = 5GHz)
Figure 15 - Differential output with lower input frequency
(VCC = 4.75V, Vin = -10dBm, Fin = 2GHz)
c Zarlink Semiconductor 2003 All rights reserved.
APPRD.
ISSUE
DATE
ACN
Package Code
Previous package codes
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Information relating to products and services furnished herein by Zarlink Semiconductor Inc. or its subsidiaries (collectively "Zarlink") is believed to be reliable.
However, Zarlink assumes no liability for errors that may appear in this publication, or for liability otherwise arising from the application or use of any such
information, product or service or for any infringement of patents or other intellectual property rights owned by third parties which may result from such application or
use. Neither the supply of such information or purchase of product or service conveys any license, either express or implied, under patents or other intellectual
property rights owned by Zarlink or licensed from third parties by Zarlink, whatsoever. Purchasers of products are also hereby notified that the use of product in
certain ways or in combination with Zarlink, or non-Zarlink furnished goods or services may infringe patents or other intellectual property rights owned by Zarlink.
This publication is issued to provide information only and (unless agreed by Zarlink in writing) may not be used, applied or reproduced for any purpose nor form part
of any order or contract nor to be regarded as a representation relating to the products or services concerned. The products, their specifications, services and other
information appearing in this publication are subject to change by Zarlink without notice. No warranty or guarantee express or implied is made regarding the
capability, performance or suitability of any product or service. Information concerning possible methods of use is provided as a guide only and does not constitute
any guarantee that such methods of use will be satisfactory in a specific piece of equipment. It is the user's responsibility to fully determine the performance and
suitability of any equipment using such information and to ensure that any publication or data used is up to date and has not been superseded. Manufacturing does
not necessarily include testing of all functions or parameters. These products are not suitable for use in any medical products whose failure to perform may result in
significant injury or death to the user. All products and materials are sold and services provided subject to Zarlink's conditions of sale which are available on request.
Purchase of Zarlink's I
2
C components conveys a licence under the Philips I
2
C Patent rights to use these components in and I
2
C System, provided that the system
conforms to the I
2
C Standard Specification as defined by Philips.
Zarlink, ZL and the Zarlink Semiconductor logo are trademarks of Zarlink Semiconductor Inc.
Copyright Zarlink Semiconductor Inc. All Rights Reserved.
TECHNICAL DOCUMENTATION - NOT FOR RESALE
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