rf2051 RF Micro Devices, rf2051 Datasheet - Page 3

• Manufacturer Part Number: rf2051
• Description: High Performance Wideband Rf Synthesizer/vco With Integrated Rf Mixers
• Manufacturer: RF Micro Devices

Note 1: The signal should be connected to this pin such that DC current cannot flow into or out of the chip, either by using AC
coupling capacitors or by use of a transformer (see evaluation board schematic).
Note 2: DC current needs to flow from ANA_VDD into this pin, either through an RF inductor, or transformer (see evaluation
board schematic).
Note 3: Alternatively an external reference can be AC-coupled to pin 11 XTALIPN, and pin 10 XTALIPP decoupled to ground. This
may make PCB routing simpler.
Rev A1 DS090106
Pin
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
EP
1
2
3
4
5
6
7
8
9
Exposed pad
ANA_VDD
ANA_DEC
DIG_VDD
Function
XTALIPN
RFOP1N
RFOP2N
XTALIPP
RFOP1P
RFOP2P
RESETB
RFIP1N
RFIP2N
RFIP1P
RFIP2P
LFILT1
LFILT2
LFILT3
SDATA
MODE
ENBL
INDN
REXT
SCLK
INDP
GND
ENX
NC
NC
NC
NC
NC
NC
Description
Ensure that the ENBL high voltage level is not greater than V
digital noise.
VCO 3 differential inductor. Normally a micro-strip inductor is used to set the VCO 3 frequency range 1200MHz
to 1600MHz.
VCO 3 differential inductor. Normally a micro-strip inductor is used to set the VCO 3 frequency range 1200MHz
to 1600MHz.
External bandgap bias resistor. Connect a 51kΩ resistor from this pin to ground to set the bandgap reference
bias current. This could be a sensitive low frequency noise injection point.
Analog supply decoupling capacitor. Apply RF decoupling to a good quality ground as close to the pin as possible.
Phase detector output. Low-frequency noise-sensitive node.
Loop filter op-amp output. Low-frequency noise-sensitive node.
VCO control input. Low-frequency noise-sensitive node.
Mode select pin. An RC low-pass filter can be used to reduce digital noise.
Reference crystal / reference oscillator input. Should be AC-coupled if an external reference is used. See note 3.
Reference crystal / reference oscillator input. Should be AC-coupled to ground if an external reference is used.
See note 3.
Connect to ground.
Differential input 1. See note 1.
Differential input 1. See note 1.
Differential output 1. See note 2.
Differential output 1. See note 2.
Digital supply. Should be decoupled as close to the pin as possible.
Analog supply. Should be decoupled as close to the pin as possible.
Differential input 2. See note 1.
Differential input 2. See note 1.
Differential output 2. See note 2.
Differential output 2. See note 2.
Chip reset (active low). Connect to DIG_VDD if external reset is not required.
Serial interface select (active low). An RC low-pass filter could be used to reduce digital noise.
Serial interface clock. An RC low-pass filter could be used to reduce digital noise.
Serial interface data. An RC low-pass filter could be used to reduce digital noise.
Connect to ground. This is the ground reference for the circuit. All decoupling should be connected here through
low impedance paths.
7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical
support, contact RFMD at ([phone] or [e-mail].
DD
. An RC low-pass filter could be used to reduce
RF2051
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