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| TI IP机顶盒解决方案(4) | |||||
作者：61IC 文章来源：本站原创 点击数： 更新时间：2007-1-18  |
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The PCA9539 consists of two 8-bit configuration (input or output selection),input port, output port and polarity inversion (active-high or active-low operation) registers. At power-on, the I/Os are configured as inputs. The system master can enable the I/Os as either inputs or outputs by writing to the I/O configuration bits. The data for each input or output is kept in the corresponding input or output register. The polarity of the input port register can be inverted with the polarity inversion register. All registers can be read by the system master. Key Features VCC range: 2.3 to 5.5 V Low standby current consumption of 1 A max Open-drain interrupt output to signal a change on an I/O pin /RESET input which initializes the slave device without de-powering it Latched outputs with high-current drive capability for driving LEDs Internal I2C address set by two hardware address pins for use of up to four devices on the I2C bus™ Consists of two 8-bit configuration, input, output and polarity inversion registers Applications System monitoring: Fan, LED and temperature Humidity sensors Audio control 16-bit bidirectional expansion  PCA9539方框图 The PCA9545A is a quad, bidirectional translating switch controlled via the I2C bus. The SCL/SDA upstream pair fans out to four downstream pairs, or channels. Any individual SCn/SDn channel or combination of channels can be selected, determined by the contents of the programmable control register. Key Features Four bidirectional translating switches Each channel (SCLn/SDAn) can be selected via I2C bus Low RDSON switches (10 typically) VCC range: 2.3 to 5.5 V Voltage-level translation between 2.5-, 3.3- and 5-V buses Internal I2C address: 1110 0xx Two address pins One to four channels can be selected at one time Interrupt output signals change on a channel RESET input initializes the device without de-powering it and deselects all channels Applications System monitoring: Fan, LED and temperature • Mixed voltage I2C systems • I2C bus expansion  PCA9545A方框图 The PCM1850 is a high-performance stereo analog-to-digital converter that features an input multiplexer (MUX) and wide-range programmable gain amplifier (PGA). The input MUX allows the user to connect up to six stereo sources, which may be selected through SPI (PCM1850) or I2C (PCM1851) control interfaces. Key Features Input multiplexer, six stereo channels PGA gain: +11 to –11 dB range, 0.5 dB step SNR: 101 dB (typ) SPI (PCM1850) or I2C (PCM1851) control Sampling rate: 16 to 96 kHz System clock: 256 fS, 384 fS, 512 fS or 768 fS +5 V for analog, +3.3 V for digital Packaging: 32-pin TQFP, Pb-Free Applications DVD recorders AV amp receivers CD recorders MD recorders Multitrack receivers  PCM1850方框图 Fabricated using the BiCOM-III process, the THS7303 is a low-power,three-channel integrated video buffer. It incorporates a selectable 5thorder Butterworth filter to eliminate data converter images. Each channel is individually I2C configurable for all functions, which makes it flexible for any application. Its rail-to-rail output stage allows for both AC and DC coupling applications, and the 6-dB gain along with built-in SAG correction allows for maximum flexibility as an output video buffer. Key Features 3 video amps for CVBS, S-Video, YUV, SD/ED/HD YPBPR and RGB I2C control of all functions Integrated low-pass filters Selectable input bias modes 2:1 input MUX allows multiple input sources Built-in 6-dB gain (2 V/V) Single supply: 2.7 V to 5 V Low quiescent current: 16.6 mA Differential gain/phase: 0.13%/0.55° at 3.3 V Applications Set-top box output video buffering PVR/DVDR output buffering USB/Portable video buffering  |
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