ZL40815
10GHz Fixed Modulus
÷
4
Data Sheet
Features
•
•
•
•
•
•
Very High Operating Speed
Operation down to DC with Square Wave Input
Low Phase Noise (Typically better than
-146 dBc/Hz at 10 kHz)
5 V Single Supply Operation
Low Power Dissipation: 510 mW (Typ)
Surface Mount Plastic Package With Exposed
Pad (See Application Notes)
Ordering Information
ZL40815DCE
ZL40815DCF
ZL40815DCF1
ZL40815DCE1
Tubes, Bake & Drypack
Tape & Reel,
Bake & Drypack
8 Pin SOP/SOIC* Tape & Reel,
Bake & Drypack
8 Pin SOP/SOIC* Tubes, Bake & Drypack
*Pb Free Matte Tin
-40°C to +85°C
8 Pin SOP/SOIC
8 Pin SOP/SOIC
March 2006
Applications
•
•
•
•
•
•
•
DC to 10 GHz PLL applications
HyperLan
LMDS
Instrumentation
Satellite Communications
Fibre Optic Communications; OC48, OC192
Ultra Low Jitter Clock Systems
Description
The ZL40815 is one of a range of 5 V supply, very high
speed, low power prescalers for professional
applications with a fixed modulus of divide by 4. 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 1 V p-p
output. See application notes for more details
VCC IN
1
50 Ohm
VCC OUT
8
OUTPUT
7
6
OUTPUT B
Vref
Div 4
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 2003-2006, Zarlink Semiconductor Inc. All Rights Reserved.
ZL40815
Pin Connections - Top View
Data Sheet
Vcc INPUT
INPUT
INPUT B
GND
1
2
3
4
8
7
6
5
Vcc OUTPUT
OUTPUT
OUTPUT B
GND
SOIC (N) E-Pad
Applications Configuration
Figure 2 shows a recommended application configuration. This example shows the devices set up for single ended
operation.
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
Vcc 5V
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 optimize 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.
ZL40815
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
T
ST
T
J
max
TH
ja
58.6
Symbol
Vcc
2.5
2k
-65
+150
+125
Min.
Max.
6.5
(Vdd_IO+5%)
Units
V
Vp-p
V
°C
°C
°C/W
multi-layer PCB
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
102
Max.
Units
mA
Conditions
Input stage bias current
Divider and output stages
RMS sinewave (see Note 1)
fin = 1 GHz to 2 GHz
fin = 2 GHz to 9.5 GHz
fin = 11 GHz
fin = 1 GHz to 4 GHz
fin = 5 GHz to 11 GHz
For <2 GHz operation.
Differential Into 50 ohm pullup resistors
Single-ended output, fin = 2 GHz to 10 GHz,
pwr ip= -10 dBm
Fin = 5 GHz, pwr ip = 0 dBm
See Figure 7 and Figure 8.
130
11
mA
GHz
dBm
2
-8
-15
-10
8
11
900
1
-3
-1
-146
45
50
-10
0
dBm
dBm
dBm
dBm
V/ìs
Vp-p
1.2
dBm
dBc/Hz
55
%
Input sensitivity and output power values assume 50 Ohm source and load impedances.
† The following characterization test method incremented the amplitude over the entire range of frequency and ensures that there are no
"holes" in the characteristic.
† The following characteristics are guaranteed by either production test or design.
3
Zarlink Semiconductor Inc.
ZL40815
Typical input sensitivity (sinewave drive) @ +25 Deg C
20.00
Data Sheet
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
or more
source has an edge speed 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 3 - Input Sensitivity @ +25°C
Electrical Characteristics
(Vcc = 5V ±5%, Tamb = -40 to +85C)
†
Characteristic
Supply current
Supply current
Supply current
Supply current
Supply current
Supply current
Supply current
Note 1:
Pin
1
8
8
8
8
8
8
Min.
Typ.
0.35
Max.
Units
mA
Conditions
Input stage bias current (see Note 1)
-40°C 5.25 V
-40°C 4.75 V
+25°C 5.25 V
+25°C 4.75 V
+85°C 5.25 V
+85°C 4.75 V
73
59
81
65
87
67
st
102
83
112
91
121
96
131
106
142
116
156
125
mA
mA
mA
mA
mA
mA
Pin 1 is the Vcc pin for the 1 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 9).
† The characteristics are guaranteed by design and characterisation over the range of operating conditions unless otherwise stated:
‡ (Input Frequency range 1 to 10 GHz rms Sinewave)
4
Zarlink Semiconductor Inc.
ZL40815
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
Pin
2,3
2,3
2,3
2,3
2,3
2,3
6,7
6,7
6,7
6,7
-4
45
2
2
5
5
900
1
-1
50
110
2
55
Min.
Typ.
-15
5
8
13
11
Max.
-10
Units
dBm
dBm
dBm
dBm
dBm
V/ìs
Vp-p
dBm
%
ps
Conditions
Data Sheet
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 50 ohm pullup resistors
Single-ended output, fin = 2 GHz to
10GHz, pwr ip= -10dBm
Note 1: Input sensitivity and output power values assume 50 Ohm source and load impedances.
† 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
or
less
source has an edgespeed 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 4 - Input Sensitivity @ -40, +25, +70 and +85°C
5
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