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ADF5000 Schematic ( PDF Datasheet ) - Analog Devices

Teilenummer ADF5000
Beschreibung 4 GHz to 18 GHz Divide-by-2 Prescaler
Hersteller Analog Devices
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Gesamt 13 Seiten
ADF5000 Datasheet, Funktion
Data Sheet
FEATURES
Divide-by-2 prescaler
High frequency operation: 4 GHz to 18 GHz
Integrated RF decoupling capacitors
Low power consumption
Active mode: 30 mA
Power-down mode: 17 mA
Low phase noise: −147 dBc/Hz
Single dc supply: 3.3 V compatible with ADF4xxx PLLs
Temperature range: −40°C to +105°C
Small package: 3 mm × 3 mm LFCSP
APPLICATIONS
PLL frequency range extender
Point-to-point radios
VSAT radios
Communications test equipment
GENERAL DESCRIPTION
The ADF5000 prescaler is a low noise, low power, fixed RF
divider block that can be used to divide down frequencies as
high as 18 GHz to a lower frequency suitable for input to a
PLL IC, such as the ADF4156 or the ADF4106. The ADF5000
provides a divide-by-2 function. The ADF5000 operates from
a 3.3 V supply and has differential 100 Ω RF outputs to allow
direct interface to the differential RF inputs of PLLs such as
the ADF4156 and ADF4106.
4 GHz to 18 GHz
Divide-by-2 Prescaler
ADF5000
FUNCTIONAL BLOCK DIAGRAM
CE
RFIN
3pF
50Ω
BIAS
DIVIDE
BY 2
ADF5000
VDDx
100Ω
100Ω
1pF
1pF
RFOUT
RFOUT
GND
Figure 1.
Rev. A
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ADF5000 Datasheet, Funktion
Data Sheet
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
ADF5000
GND 1
RFIN 2
GND 3
GND 4
PIN 1
INDICATOR
ADF5000
TOP VIEW
(Not to Scale)
12 GND
11 RFOUT
10 RFOUT
9 GND
NOTES
1. NC = NO CONNECT. DO NOT CONNECT
TO THIS PIN.
2. THE EXPOSED PADDLE MUST BE
CONNECTED TO GND.
Figure 2. Pin Configuration
Table 3. Pin Function Descriptions
Pin No.
Mnemonic Description
1, 3, 4, 5, 8, 9, GND
12, 13, 16
RF Ground. Tie all ground pins together.
2 RFIN Single-Ended 50 Ω Input to the RF Prescaler. This pin is ac-coupled internally via a 3 pF capacitor.
6 NC No Connect. Do not connect to this pin.
7 CE Chip Enable. This pin is active high. When CE is brought low, the part enters power-down mode. If this
functionality is not required, the pin can be left unconnected because it is pulled up internally through
a weak pull-up resistor.
10
RFOUT
Divided-Down Output of the Prescaler. This pin has an internal 100 Ω load resistor tied to VDD2 and an
ac coupling capacitor of 1 pF.
11
RFOUT
Complementary Divided Down Output of the Prescaler. This pin has an internal 100 Ω load resistor tied
to VDD2 and an ac coupling capacitor of 1 pF.
14
VDD2
Voltage Supply for the Output Stage. Decouple this pin to ground with a 0.1 µF capacitor in parallel with a
10 pF capacitor. VDD2 can be tied directly to VDD1.
15
VDD1
Voltage Supply for the Input Stage and Divider Block. Decouple this pin to ground with a 0.1 µF capacitor
in parallel with a 10 pF capacitor.
EPAD
The LFCSP has an exposed paddle that must be connected to GND.
Rev. A | Page 5 of 12

6 Page









ADF5000 pdf, datenblatt
Data Sheet
NOTES
ADF5000
Rev. A | Page 11 of 12

12 Page





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