RF2053
Pin
1
Function
ENBL
Description
Ensure that the ENBL high voltage level is not greater than V . An RC low-pass filter could be used to reduce
digital noise.
DD
External VCO differential input. See note 1.
2
3
4
VCOINP
VCOINN
REXT
External VCO differential input. See note 1.
External bandgap bias resistor. Connect a 51k 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. Connect to analog supply and apply RF decoupling to a good quality ground
as close to the pin as possible.
5
ANA_DEC
Phase detector output. Low-frequency noise-sensitive node.
6
7
LFILT1
NC
8
NC
Mode select pin. Connect to DIG_VDD if mode switching is not required.
9
10
11
MODE
XTALIPP
XTALIPN
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.
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
EP
GND
NC
NC
NC
NC
NC
NC
DIG_VDD
NC
Digital supply. Should be decoupled as close to the pin as possible.
NC
Analog supply. Should be decoupled as close to the pin as possible.
Differential input. See note 1.
ANA_VDD
RFIPN
RFIPP
NC
Differential input. See note 1.
NC
Differential output. See note 2.
RFOPN
RFOPP
RESETB
ENX
SCLK
SDATA
Exposed pad
Differential output. 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.
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.
7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical
support, contact RFMD at (+1) 336-678-5570 or sales-support@rfmd.com.
DS140110
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RFMD [ RF MICRO DEVICES ]
