TI's SN761633 is a single-chip FM stereo radio receiver and transmitter with frequencies ranging from 76 MHz to 108 MHz and is widely used in portable media players (PMPs), MP3 players and personal navigation devices.
This article describes the main features, functional block diagrams and application circuit diagrams of the SN761633.
The SN761633 is an FM radio receiver and transmitter IC for portable audio players. The circuit consists of a stereo FM radio receiver and FM transmitter, and is available in a small-outline package.
Main features:
·Single-Chip FM Stereo Radio and Transmitter
·FM Stereo MPX [Receive (Rx), Transmit (Tx)]
·Frequency Range 76 MHz to 108 MHz (Rx, Tx)
·Low Supply Current
· Rx: 11.5 mA (VCC = 3 V, No RF Input)
·Tx: 13 mA (VCC = 3 V, No Audio Input,
·RTX = Open)
·32.768-kHz Crystal
·I2C Interface
·MPX Output for RDS (Rx)
·Seek Tuning (Rx)
·RFAGC (Rx)
·RF Auto-Power Control (Tx)
·Pilot Cancel (Rx)
· Sixth-Order 15-kHz LPF (Tx)
·Programmable De/Pre-Emphasis (50/75 μs)
·Pilot Out (Tx)
·General-Purpose External Input (Tx)
·High Power Selectable RF Output (Tx)
·–7/–3/1/4 dBm
· High Cut Control (HCC), Stereo Noise Control (SNC) (Rx)
·Soft Mute (Rx)
·VCC = 2.5 V to 4 V
·40-Pin QFN Package
application:
·Portable media player
·MP3 player
·Personal navigation equipment
Figure 1 SN761633 block diagram
Figure 2 SN761633 application circuit diagram
Led Strip Controller is to control the LED light bar of the instrument.
Features of Low-voltage LED Strip Controller is to control more than large ones, to control the use of the serial signal transmission purposes, the general control unit 512 need only four control connection, serial LED controller LED light sources require board register with the controller can choose models NE040S controller.
LED strip controller can be divided into two categories: led light bar products, high power controller and led light bar products, serial controller.
LED strip are generally designed voltage 12V-36V, the number of each loop LED 3-6 series, with resistance step-down current limiting, each loop current 20mA or less. LED products from a number of loops of the LED composition, the advantage of LED Strip Controller of low voltage, simple structure, easy to design;
Drawback is: LED Strip Controller is large-scale products when the current great need to configure low-voltage switching power supply. As the shortcomings of the product limitations, low voltage transmission can not be long-distance, Caused led strip controller is limited to small size products, such as signs of text, small designs. According to this feature, the controller design specifications: 12V selection of 75A / 30V MOS power control, the output current 8A / Road.
Mingxue Optoelectronics Co.,Ltd. has apply the I S O 9 0 0 1: 2 0 0 8 international quality management system certificate, As for LED Strip Controller , we apply the CE, RoHS and SAA certificate for our led lighting product.
LED Strip Controller
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