|
|
PDF PT4316 Data sheet ( Hoja de datos )
| Número de pieza | PT4316 | |
| Descripción | Low Power 315/433 MHz OOK/ASK Superheterodyne Receiver | |
| Fabricantes | PTC | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de PT4316 (archivo pdf) en la parte inferior de esta página. Total 17 Páginas | ||
|
No Preview Available !
ANGUS ELECTRONICS CO., LTD
Tel: (852) 2345 0540
Fax: (852) 2345 9948
PT4316
Low Power 315/433MHz OOK/ASK Superheterodyne
Web Site: www.angus.com.hk
Receiver with SAW-based Oscillator
DESCRIPTION
The PT4316 is a very low power consumption single
chip OOK/ASK superheterodyne receiver for the 315
MHz and 434 MHz frequency bands, which offers a
high level of integration and requires few external
components. The PT4316 consists of a low-noise
amplifier (LNA), mixer, SAW-based local oscillator,
on-chip Sallen-Key low-pass filter, intermediate
frequency (IF) limiting amplifier stage with
received-signal-strength indicator (RSSI), and analog
baseband data recovery circuitry (data filter, peak
detector, and data slicer). The PT4316 also
implements a discrete one-step automatic gain control
(AGC) that reduces the LNA gain by 20 dB when the
RF input signal is greater than -60 dBm. The PT4316
is available in a 16-pin SOP or SSOP package. Both
versions are specified over the extended temperature
range (-40℃ to +85℃).
BLOCK DIAGRAM
FEATURES
• Low current consumption (4.2 mA at VDD = 3.0 V)
• 2.4 V to 3.6 V supply voltage operation range
• Optimized for 315 MHz or 434 MHz ISM Band
• Saw-based oscillator with low frequency drift
• High dynamic range with on-chip AGC
• Power down mode with very low supply current (<
1 µA)
• Low external parts count
• Available in 16-pin SOP or SSOP package
APPLICATIONS
• Keyless entry systems
• Remote control systems
• Garage door openers
• Alarm systems
• Security systems
• Wireless sensors
V1.7
1
1 page  
PT4316
MIXER
The doubly-balanced mixer down-converts the input frequency (RF) in the range of 250 MHz to 500 MHz to the
intermediate frequency (IF) at 1.2 MHz with a voltage gain of approximately 20 dB by utilizing either high- or low-side
injection of the local oscillator signal. In the case that the RF input to the mixer is single-ended, the unused mixer input
must be tied to ground via a capacitor. The mixer is followed by a low pass filter with a corner frequency of 5 MHz in
order to suppress RF signals at the IF output.
Both the desired signal band and image signal band are converted to the IF band. If the environment, especially the
image channel, is noisy, it is recommended that an external SAW filter be added to remove the unwanted signals. The
channel selectivity indicates the ability of the noise rejection. The measurement of channel selectivity of PT4316 without
the external SAW filter is plotted in the following figure.
Sensitivity and Selectivity @434 MHz Band
-50
-60
Selectivity
Sensitivity
-70
-80
-90
-100
-110
430.92
432.42
433.92 435.42 436.92
RF Input Frequency (MHz)
438.42
439.92
IF LOW-PASS FILTER
The built-in IF filter is composed of three Sallen-Key low-pass filter stages and it has a -3 dB bandwidth of 3.1 MHz. The
frequency response of the IF low-pass filters is plotted below.
V1.7
5
5 Page 
PT4316
PCB LAYOUT CONSIDERATION
Proper PCB layout is extremely critical in achieving good RF performance. At the very least, using a two-layer PCB is
strongly recommended, so that one layer may incorporate a continuous ground plane. A large number of via holes
should connect the ground plane areas between the top and bottom layers. Note that if the PCB design incorporates a
printed loop antenna, there should be no ground plane beneath the antenna.
Within the PT4316, the power supply rails of the LNA and others blocks should be separated for improving the isolation
and minimizing the noise coupling effects. Careful consideration must also be paid to the supply power and ground at
the board level. The larger ground area plane should be placed as close as possible to the VSS and VSSLNA pins. To
reduce supply bus noise coupling, sensitive blocks such as the LNA or mixer should be biased thru separated power
supply traces, incorporating series-R, shunt-C filtering as the following figure.
If the power source is capable of supplying a stable voltage, C’ may be ignored. In some applications, the DC source
may be supplied from a simple AC-DC transformer. In such cases, the DC voltage level could be unstable and may
adversely affect ASK/OOK receiver sensitivity. A solution may be to increase C to an appropriately large value while
continuing to make the power source as stable as possible.
Finally, in an RF system, it is extremely important to keep the LNA or RF signal traces away from large voltage swing
signals and digital data signal traces to avoid unnecessary interference. A representative layout of a PT4316
demo-board is shown in page 14.
V1.7
11
11 Page | ||
| Páginas | Total 17 Páginas | |
| PDF Descargar | [ Datasheet PT4316.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| PT431 | HIGH SENSITIVITY PHOTOTRANSISTOR |  Sharp Electrionic |
| PT4316 | Low Power 315/433 MHz OOK/ASK Superheterodyne Receiver | PTC |
| PT4317 | Low Power 315/433 MHz OOK/ASK Superheterodyne Receiver | PTC |
| PT431F | HIGH SENSITIVITY PHOTOTRANSISTOR | Sharp Electrionic |
| Número de pieza | Descripción | Fabricantes |
| SLA6805M | High Voltage 3 phase Motor Driver IC. |
 Sanken |
| SDC1742 | 12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters. |
 Analog Devices |
|
DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares, |
| DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar |