|
|
PDF PA1418 Data sheet ( Hoja de datos )
| Número de pieza | PA1418 | |
| Descripción | Radio Transmitter | |
| Fabricantes | Protek Devices | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de PA1418 (archivo pdf) en la parte inferior de esta página. Total 19 Páginas | ||
|
No Preview Available !
ANALOG PRODUCT DIVISION
PA1418 Technical Note
Introduction
This is a reference note for Protek Analog’s PA1418. The document includes data for the IC, recommended
external components, and other pertinent information.
Please read all instructions and recommendations before beginning to design any product that is to include this
device. This document contains a checklist to reference before powering up completed circuit and
troubleshooting procedures outlining causes and countermeasures for issues arising in the application of the IC.
Contact information is included if this document is insufficient to answer any problems or questions that may
arise.
Contents
1. Overview.
1.1. Features
1.2. Block Diagrams
24TSSOP Pin out
32 QFN Pin out
1.3. Absolute Maximum Ratings
1.4. Operating Range
2. Operation.
3. Navigator.
4. Explanation of External Parts.
4.1. Pre-Emphasis
4.2. Limiter
4.3. Low-Pass Filter
4.4. Half VDD Filter
4.5. Composite Signal Adjust
4.6. RF Oscillator
4.7. RF Output
4.8. X’TAL Oscillator
4.9. Serial Data Input
4.10. Phase Lock Loop
4.11. Audio Mute
4.12. Pilot Signal Adjust
5. PCB Sample and Recommendations.
1. Overview:
The PA1418 is a Radio Transmitter that can send audio signals from personal computers, game consoles or
independent devices to any type of audio equipment with a built in FM receiver.
The IC consists of a Pre-Emphasis circuit that improves Signal to Noise Ratio (S/N), a Limiter circuit that
prevents over-modulation and a low Pass filter (LPF) circuit that limits the maximum modulation frequency. The
Stereo modulation circuit generates stereo composite signals through a FM transmitter circuit with Phase-
Locked Loop (PLL) frequency synthesizers.
1. 1. Features
1. Improved Audio Quality due to integrated Pre-emphasis, limiter and Low-pass filter circuits.
2. Pilot tone FM stereo modulation circuit is integrated.
3. An incorporated PLL frequency synthesizer ensures a stable FM transmission frequency.
4. Device utilizes a serial data control method to set the frequency via a microcontroller.
5. Integrated mute option.
561 E Elliot Road. Chandler, AZ 85225 Tel: (480) 539-2900. Fax: (480) 632-1715.
www.protekanalog.com
Free Datasheet http://www.nDatasheet.com
1 page  
ANALOG PRODUCT DIVISION
PA1418 Technical Note
iii. Cautions during Installation.
a. Some device packages contain NC terminals, please do not use these free pads for relays, or allow the other pins
to make contact with these NC terminals. Problems such as unwanted oscillations may occur.
b. Caution: If a heat sink is cut or damaged and the device is deformed the induced thermal stress can cause a failure
or limit the life of the device.
c. When mounting device on a board please be careful to align the device in the correct direction, both the 32 QFN
and 24 TSSOP packages have dots placed in the same corner of the package corresponding to pin 1. Powering on
the device with the pins misaligned can ruin the device.
32 QFN
24 TSSOP
24
13
PA1418
PA1418
XXXX
1 12
d. Install the device gently on its PCB level with the plane of the board to reduce stress on pins and contacts.
e. Before soldering device, be sure that the soldering iron properly grounded and that it is not leaking power into the
tip. Discharge from the iron can cause failure of the device when placed in contact with the pins.
f. Verify that all assembly stations and their perspective assembly techs are properly grounded as released static
charge can have an adverse effect on the device. Likewise, pay close attention to the humidity and production
methods to reduce static buildup.
iv. Cautions during testing and inspection.
a. Be sure to inspect soldering for accuracy before applying power to the device, bridged pins can cause serious
damage.
b. Please use a current limiter circuit on the power supply, high currents can go into the device and ruin it.
c. Be careful that the device or board is in the designated position before starting measurement inspection or possible
high currents can damage product.
d. Ensure that the ground will not generate a surge current.
v. Heat Design
a. The operational characteristics of this device are affected by temperature. Excessive heat can cause the
performance and life expectancy of the product to reduce dramatically, in Extreme cases destroying the device
outright.
b. The IC is designed for balanced temperature at normal operation; if however, external components or lack of
proper ventilation cause excessive heat than additional heat sinks can be utilized to cool the device.
c. If additional heat sinks are implemented, please ensure that they are properly bonded to device.
If you have any questions about thermal design or any other topics in an application please contact the applications team at
Protek Analog.
561 E Elliot Road. Chandler, AZ 85225 Tel: (480) 539-2900. Fax: (480) 632-1715.
www.protekanalog.com
Free Datasheet http://www.nDatasheet.com
5 Page 
ANALOG PRODUCT DIVISION
PA1418 Technical Note
CTOT is the combination of the inline capacitance of VCD and C3 with C2. Choose a VCD that had a linear c-v
relationship of 0 ≤ VIN ≤ 5.0. In this schematic the part number used was Zetex ZMV832ACT that has a
capacitance range of 30pF @ VIN = 0V to 11pF @ VIN = 5.0V. (please refer to manufacturer’s datasheet for
detailed information on this part)
The type of capacitor used for C2 is also of importance because of the need to cancel the temperature
characteristics of L1. A temperature compensating ceramic capacitor is utilized for this purpose. For air-core coil
inductors RH (-220±60 ppm/Cº) or SH (-330±60 ppm/Cº) can be used, for ferrite-core inductors TH (-470±60
ppm/Cº) or UJ (-750±60 ppm/Cº) are recommended.
The damping resistor R1 and the coupling capacitor C1 are used to correct the harmonics of the oscillating circuit.
C2 should be set between 470pF and 47nF. If larger values are utilized, the internal oscillator is greatly affected
by the external circuits and may not stabilize. If the value is set low the Q of the oscillating circuit is decreased
and the oscillating may stop.
The harmonics are observed by monitoring the antenna terminal with a spectrum analyzer. Please be sure to
match the impedance (50Ω or 75Ω) or the results will be misleading.
The damping resistor is used to reduce the harmonics level. Set R1 between 0Ω and 10Ω. R1 must be set so that
the harmonics comply with the radio laws of the marketed countries.
To confirm the oscillation range of operation,
1. Manually discharge the inductor to stop the oscillation and upon removing the source of the interruption,
check to see if the oscillating resumes.
2. Confirm that oscillation can continue when the power supply drops below 3.0V
3. Given that step 1 and 2 passed. Increase the value of R1 by at least 33% and check to see if the circuit
can still oscillate.
4. If the circuit is incapable of passing the first 3 tests, increase the value of C1 or alter L1 or the VCD to
increase the Q of the circuit.
R2 is used to increase the impedance after the VCD; to achieve this at least 10KΩ should be employed. R3 and
C4 act as a low pass filter for the DC voltage at VCD, choose R3 as 3.3kΩ and C4 as 2.2nF.
4.7. RF Output (Pin 12)
A BPF must be inserted in-between the RF output and the antenna to suppress undesired RF output harmonics.
The output impedance of pin 12 is set to 75Ω.
OSC
11
RF
12
C1
R2
DUAL
MODULUS
DIVIDER
L1 L2
R1 R3 C2 C3 C4
BPF
ANTENNA
561 E Elliot Road. Chandler, AZ 85225 Tel: (480) 539-2900. Fax: (480) 632-1715.
www.protekanalog.com
Free Datasheet http://www.nDatasheet.com
11 Page | ||
| Páginas | Total 19 Páginas | |
| PDF Descargar | [ Datasheet PA1418.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| PA141 | (PA141 / PA142) HIGH VOLTAGE POWER OPERATIONAL AMPLIFIERS |  Apex Microtechnology |
| PA1418 | Radio Transmitter | Protek Devices |
| PA1418FV | STEREO FM TRANSMITTER | Protek Devices |
| PA141A | (PA141 / PA142) HIGH VOLTAGE POWER OPERATIONAL AMPLIFIERS | Apex Microtechnology |
| 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 |