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
July 2003
Ordering Information
ZL40812/DCE (tubes)
8 lead e-pad SOIC
ZL40812/DCF (tape and reel) 8 lead e-pad SOIC
-40°C to +85°C
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
1
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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.
ZL40812
Pin Connection - Top View
Vcc INPUT
INPUT
INPUT B
GND
1
2
3
4
Vcc OUTPUT
OUTPUT
OUTPUT B
GND
Data Sheet
8
7
6
5
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.
ZL40812
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
Parameter
1
2
3
4
5
6
Supply Voltage
Prescaler Input Voltage
ESD protection (Static Discharge)
Storage temperature
Maximum Junction Temp
Thermal Characteristics
Thja
T
ST
-65
Symbol
Vcc
Min
Max
6.5V
2.5
2
150
125
58.6
Vp-p
kV
ºC
ºC
°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
2
-8
-15
-10
8
11
900
1
-3
-1
-152
45
50
-10
0
dBm
dBm
dBm
dBm
V/ìs
Vp-p
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.
3
Zarlink Semiconductor Inc.
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.
ZL40812
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:
Data Sheet
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/ìs
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
Vp-p
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
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