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PDF RF2516 Data sheet ( Hoja de datos )
| Número de pieza | RF2516 | |
| Descripción | VHF/UHF TRANSMITTER | |
| Fabricantes | RF Micro Devices | |
| Logotipo |  |
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Preliminary
11
RF2516
VHF/UHF TRANSMITTER
Typical Applications
• 315/433MHz Band Systems
• Local Oscillator Source
• Part 15.231 Applications
• Remote Keyless Entry
• Wireless Security Systems
• AM/ASK/OOK Transmitter
Product Description
The RF2516 is a monolithic integrated circuit intended for
use as a low-cost AM/ASK transmitter. The device is pro-
vided in a 16-pin QSOP-16 package 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 bands. The integrated VCO, phase detector,
prescaler, and reference oscillator transistor require only
the addition of an external crystal to provide a complete
phase-locked loop. 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.
0.196
0.189
0.157
0.150
0.2440
0.2284
0.012
0.008
0.025
8° MAX
0°MIN
0.050
0.016
0.0098
0.0075
NOTES:
1. Shaded lead is Pin 1.
2. All dimensions are excluding mold flash.
3. Lead coplanarity - 0.005 with respect to datum "A".
-A-
0.0098
0.0040
0.0688
0.0532
Optimum Technology Matching® Applied
Si BJT
üSi Bi-CMOS
GaAs HBT
SiGe HBT
GaAs MESFET
Si CMOS
13 12
14
21
TX OUT 5
Lock
Detect
8 15
Phase
Detector &
Charge Pump
Prescaler
32/64
16
DC
Bias
3 PD
Package Style: QSOP-16
Features
• Fully Integrated PLL Circuit
• Integrated VCO and Reference Oscillator
• 2.0V to 3.6V Supply Voltage
• Low Current and Power Down Capability
• 100MHz to 500MHz Frequency Range
• Out-of-Lock Inhibit Circuit
11
Ordering Information
RF2516
VHF/UHF Transmitter
RF2516 PCBA Fully Assembled Evaluation Board
Functional Block Diagram
RF Micro Devices, Inc.
7625 Thorndike Road
Greensboro, NC 27409, USA
Tel (336) 664 1233
Fax (336) 664 0454
http://www.rfmd.com
Rev A10 010613
11-35
1 page  
Preliminary
RF2516
RF2516 Theory of Operation
Introduction
Short range radio devices are becoming commonplace
in today’s environment. The most common examples
are the remote keyless entry systems popular on many
new cars and trucks, and the ubiquitous garage door
opener. Other applications are emerging with the
growth in home security, automation and the advent of
various remote control applications. Typically these
devices have been simplex, or one-way, links. They are
also typically built using surface acoustic wave (SAW)
devices as the frequency control elements. This
approach has been attractive because the SAW
devices have been readily available and a transmitter,
for example, could be built with only a few additional
components. Recently however, RF Micro Devices,
Inc. (RFMD), has introduced several new components
that enable a new class of short-range radio devices
based on the use of crystals and phase-locked loops
for frequency control. These devices are superior in
performance and comparable in cost to the traditional
SAW-based designs. The RF2516 is an example of
such a device. The RF2516 is targeted for applications
such as 315MHz and 433MHz band remote keyless
entry systems and wireless security systems, as well
as other remote control applications.
The RF2516 Transmitter
The RF2516 is a low-cost AM/ASK VHF/UHF transmit-
ter designed for applications operating within the fre-
quency range of 100MHz to 500MHz. In particular, it is
intended for 315MHz to 433MHz band systems,
remote keyless entry systems, and FCC Part 15.231
periodic transmitters. It can also be used as a local
oscillator signal source. The integrated VCO, phase
detector, prescaler, and reference oscillator require
only the addition of an external crystal to provide a
complete phase-locked loop. In addition to the stan-
dard power-down mode, the chip also includes an
automatic lock-detect feature that disables the trans-
mitter output when the PLL is out-of-lock.
The device is manufactured on a 25GHz Silicon Bipo-
lar-CMOS process and packaged in an industry stan-
dard SSOP-16 plastic package. This, combined with
the low external parts count, enables the designer to
achieve small-footprint, high-performance, low-cost
designs.
The RF2516 is designed to operate from a supply volt-
age ranging from 2.0V to 3.6V, accommodating
designs using three NiCd battery cells, two AAA flash-
light cells, or a lithium button battery. The device is
Rev A10 010613
capable of providing up to +10dBm output power into a
50Ω load, and is intended to comply with FCC require-
ments for unlicensed remote control transmitters. ESD
protection is provided on all pins except VCO and TX
OUT.
While this device is intended for OOK operation, it is
possible to use narrowband FM. This is accomplished
by modulating the reference oscillator rather than
applying the data to the MOD IN input pin. The MOD
IN pin should be tied high to cause the device to trans-
mit. The deviation will be set by pulling limits of the
crystal. Deviation sufficient for the transmission of
voice and other low data rate signals can therefore be
accomplished. Refer to the Application Schematic in
the data sheet for details.
The RF2516 Functional Blocks
A PLL consists of a reference oscillator, a phase detec-
tor, a loop filter, a voltage controlled oscillator (VCO),
and a programmable divider in the feedback path. The
RF2516 includes all of these internally, except for the
loop filter and the reference oscillator’s crystal and two
feedback capacitors.
The reference oscillator is a Colpitts type oscillator.
Pins 1 (OSC B) and 2 (OSC E) provide connections to
a transistor that is used as the reference oscillator. The
Colpitts configuration is a low parts count topology with
reliable performance and reasonable phase noise.
Alternatively, an external signal could be injected into
the base of the transistor. The drive level should, in
either case, be around 500mVPP. This level prevents
overdriving the device and keeps the phase noise and
reference spurs to a minimum.
The prescaler divides the VCO frequency by either 64
or 32, using a series of flip-flops, depending upon the
logic level present at the DIV CTRL pin. A high logic
level will select the 64 divisor. A low logic level will
select the 32 divisor. This divided signal is then fed into
the phase detector where it is compared with the refer-
ence frequency.
The RF2516 contains an onboard phase detector and
charge pump. The phase detector compares the
phase of the reference oscillator to the phase of the
VCO. The phase detector is implemented using flip-
flops in a topology referred to as either “digital phase/
frequency detector” or “digital tri-state comparator”.
The circuit consists of two D flip-flops whose outputs
are combined with a NAND gate which is then tied to
11
11-39
5 Page 
Preliminary
Pin Out
OSC B 1
OSC E 2
PD 3
GND 4
TX OUT 5
GND1 6
VCC1 7
MOD IN 8
16 DIV CTRL
15 LD FLT
14 LOOP FLT
13 RESNTR+
12 RESNTR-
11 VREFP
10 GND2
9 VCC2
RF2516
11
Rev A10 010613
11-45
11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet RF2516.PDF ] | |
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