RF2514
VHF/UHF
Transmitter
RF2514
VHF/UHF TRANSMITTER
Package Style: QFN, 16-Pin, 4x4
LOOP FLT
RESNTR+
RESNTR-
OSC E
Features
Fully Integrated PLL Circuit
Integrated VCO and Refer-
ence Oscillator
2.25V to 3.6V Supply Voltage
Low Current and Power Down
Capability
100MHz to 1000MHz Fre-
quency Range
Out-of-Lock Inhibit Circuit
10
11
12
16
TX OUT 3
Lock
Detect
Phase
Detector &
Charge Pump
Prescaler
32/64
14
DIV CTRL
DC
Bias
OSC B
15
2 PD
5
MOD IN
13
LD FLT
Applications
868MHz/915MHz ISM Band
Systems
Local Oscillator Source
Remote Keyless Entry
AM/ASK/OOK Transmitter
Wireless Security Systems
Functional Block Diagram
Product Description
The RF2514 is a monolithic integrated circuit intended for use as a low-cost
AM/ASK transmitter. The device is provided in a 4mmx4mm, 16-pin leadless chip
carrier and is designed to provide a phased locked frequency source for use in local
oscillator or transmitter applications. The chip can be used in applications in the
North American and European VHF/UHF ISM bands. The integrated VCO, phase
detector, reference divider, and reference oscillator transistor require only the addi-
tion of an external crystal to provide a complete phase-locked oscillator. In addition
to the standard power-down mode, the chip also includes an automatic lock detect
feature that disables the transmitter output when the PLL is out-of-lock.
Ordering Information
RF2514
RF2514PCBA-41X
VHF/UHF Transmitter
Fully Assembled Evaluation Board
Optimum Technology Matching® Applied
GaAs HBT
GaAs MESFET
InGaP HBT
SiGe BiCMOS
Si BiCMOS
SiGe HBT
GaAs pHEMT
Si CMOS
Si BJT
GaN HEMT
RF MEMS
RF MICRO DEVICES®, RFMD®, Optimum Technology Matching®, Enabling Wireless Connectivity™, PowerStar®, POLARIS™ TOTAL RADIO™ and UltimateBlue™ are trademarks of RFMD, LLC. BLUETOOTH is a trade-
mark owned by Bluetooth SIG, Inc., U.S.A. and licensed for use by RFMD. All other trade names, trademarks and registered trademarks are the property of their respective owners. ©2006, RF Micro Devices, Inc.
Rev A5 DS040115
7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical
support, contact RFMD at (+1) 336-678-5570 or sales-support@rfmd.com.
1 of 18
RF2514
Absolute Maximum Ratings
Parameter
Parameter
Supply Voltage
Power Down Voltage (V
PD
)
Operating Ambient Temperature
Storage Temperature
Rating
Rating
-0.5 to +3.6
-0.5 to V
CC
-40 to +85
-40 to +150
Unit
Unit
V
DC
V
°C
°C
Caution! ESD sensitive device.
Exceeding any one or a combination of the Absolute Maximum Rating conditions may
cause permanent damage to the device. Extended application of Absolute Maximum
Rating conditions to the device may reduce device reliability. Specified typical perfor-
mance or functional operation of the device under Absolute Maximum Rating condi-
tions is not implied.
RoHS status based on EUDirective2002/95/EC (at time of this document revision).
The information in this publication is believed to be accurate and reliable. However, no
responsibility is assumed by RF Micro Devices, Inc. ("RFMD") for its use, nor for any
infringement of patents, or other rights of third parties, resulting from its use. No
license is granted by implication or otherwise under any patent or patent rights of
RFMD. RFMD reserves the right to change component circuitry, recommended appli-
cation circuitry and specifications at any time without prior notice.
Parameter
Overall
Frequency Range
Modulation
Modulation Frequency
Incidental FM
Output Power
ON/OFF Ratio
Min.
Specification
Typ.
Max.
Unit
Condition
T=25°C, V
CC
=3.0V, Freq=916MHz,
R
MODIN
=10kΩ
100
868/915
AM/ASK
4
1000
20
15
MHz
kHz
kHz
P-P
dBm
dB
50Ω load, CW
Square wave, 50% duty cycle, 300kHz loop
bandwidth
1
52
32/64
40
-90
-95
-25
14.318
10
10
100
0
V
CC
-0.3
100
2
2
0.3
V
CC
17
-52
50
PLL and Prescaler
Prescaler Divide Ratio
VCO Gain, K
VCO
PLL Phase Noise
Harmonics
Reference Frequency
Crystal Frequency Spurs
Max Crystal R
S
Max Crystal Motional Inductance
Charge Pump Current
MHz/V
dBc/Hz
dBc/Hz
dBc
MHz
dBc
Ω
mH
μA
V
V
kΩ
ms
ms
Crystal start-up, 14.318MHz crystal.
300kHz PLL loop bandwidth
For a typ. 2ms turn-on time.
For a typ. 2ms turn-on time.
KPD=100μA/2π=0.0159μA/rad
Voltage supplied to the input; device is “OFF”
Voltage supplied to the input; device is “ON”
Frequency and board layout dependent
10kHz Offset, 300kHz loop bandwidth
100kHz Offset, 300kHz loop bandwidth
With matched output and no additional filter-
ing.
Power Down Control
Power Down (V
IL
)
Power Down (V
IH
)
Control Input Impedance
Turn On Time
Turn Off Time
2 of 18
7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical
support, contact RFMD at (+1) 336-678-5570 or sales-support@rfmd.com.
Rev A5 DS040115
RF2514
Parameter
Power Supply
Voltage
Current Consumption
Average
8
mA
50% Duty Cycle 4kHz Data applied to the MOD
IN input. R
MODIN
(R7+R8)=10kΩ. Output
power/DC current consumption externally
adjustable by modulation input resistor (see
applicable Application Schematic).
PD=0
2.25
3.0
3.6
V
Specifications
Operating limits
Min.
Specification
Typ.
Max.
Unit
Condition
Sleep Mode
1
μA
Rev A5 DS040115
7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical
support, contact RFMD at (+1) 336-678-5570 or sales-support@rfmd.com.
3 of 18
RF2514
Pin
1
2
Function
GND1
PD
Description
Ground connection for the analog circuits, including TX buffer and output
amplifier. Internally connected to die flag. For best performance, keep
traces physically short and connect immediately to ground plane.
Power Down control for all circuitry. When this pin is a logic “low” all circuits
are turned off. When this pin is a logic “high”, all circuits are operating nor-
mally. See electrical parameters for “high” and “low” thresholds.
PD
Interface Schematic
V
CC
3
TXOUT
Transmitter output. This output is an open collector and requires a pull-up
inductor for bias/matching and a tapped capacitor for matching.
RF IN
TX OUT
MOD IN
4
5
VCC1
MOD IN
This pin is used to supply bias to the TX buffer amplifier.
AM analog or digital modulation can be imparted to the carrier by an input
to this pin. An external resistor is used to bias the output amplifiers through
this pin. The voltage at this pin must not exceed 1.1V. Higher voltages may
damage the device.
This pin is used to supply DC bias to the VCO, crystal oscillator, pre-scaler,
phase detector, and charge pump. An IF bypass capacitor should be con-
nected directly to this pin and returned to ground.
Digital PLL ground connection.
Bias voltage reference pin for bypassing the prescaler and phase detector.
The bypass capacitor should be of appropriate size to provide filtering of
the reference crystal frequency and be connected directly to this pin.
V R E FP
See pin 3.
6
7
8
VCC2
GND2
VREF P
V
CC
9
10
GND3
RESNTR-
See pin 1.
The RESNTR pins are used to supply DC voltage to the VCO, as well as to
tune the center frequency of the VCO. Equal value inductors should be con-
nected to this pin and pin 11.
RESNTR+
LOOP FLT
4 kΩ
RESNTR-
11
12
RESNTR+
LOOP FLT
See pin 10.
Output of the charge pump. An RC network from this pin to ground is used
to establish the PLL bandwidth.
V
CC
LOOP FLT
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7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical
support, contact RFMD at (+1) 336-678-5570 or sales-support@rfmd.com.
Rev A5 DS040115
RF2514
Pin
13
Function
LD FLT
Description
This pin is used to set the threshold of the lock detect circuit. A shunt
capacitor should be used to set an RC time constant with the on-chip
series 1k resistor. The time constant should be approximately 10 times the
reference period.
Interface Schematic
V
CC
LD FLT
14
DIV CTRL
Logic “High” input selects divide-by-64 prescaler. Logic “Low” input selects
divide-by-32 prescaler.s
D IV CTRL
V
CC
15
OSC B
This pin is connected directly to the reference oscillator transistor base.
The intended reference oscillator configuration is a modified Colpitts. A
68pF capacitor should be connected between pin 15 and pin 16.
OSC B
V
CC
OSC E
16
Die
Flag
OSC E
GND
ESD
This pin is connected directly to the emitter of the reference oscillator tran- See pin 15.
sistor. A 33pF capacitor should be connected from this pin to ground.
Exposed die flag is centered and measures 1.5mmx1.5mm
(0.059in.x0.059in.). For best results, provide a solder pad for the flag and
connect immediately to ground plane (see evaluation board layout). Inter-
nally connected to pins 1 and 9.
This diode structure is used to provide electrostatic discharge protection to
3kV using the Human body model. The following pins are protected: 1, 2,
4-9, 12-14. The die flag is not protected.
V
CC
Rev A5 DS040115
7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical
support, contact RFMD at (+1) 336-678-5570 or sales-support@rfmd.com.
5 of 18
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