TLV2544 PDF

A This application report analyzes a simple method for calculating minimum acquisition times for successive-approximation register analog-to-digital converters SAR ADCs. The input structure of the ADC is examined along with the driving circuit. These devices have three digital inputs and a 3-state output [chip select CS , serial input-output clock SCLK , serial data input SDI , and serial data output SDO ] that provide a direct 4-wire interface to the serial port of most popular host microprocessors SPI interface. The sample-and-hold function is automatically started after the fourth SCLK edge normal sampling or can be controlled by a special pin, CSTART, to extend the sampling period extended sampling.

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If so, How? You could potentially tie the DX pin e. DX0 to the serial input on two ADC chips which align their sample time to the incoming serial commands. DR0 and DR1 in order to obtain the separate sample values from the two chips. I think that what Jeff is alluding to is that there are several different ways of addressing an SPI chip. Some chips have a Chip Select pin which must be active the entire length of a command and data transfer.

Other chips require the Chip Select pin to only be active for each individual word of the transfer, and thus there would be multiple select transitions during a multiple word command and data transfer. Still other chips have an address coded into the serial command and do not use a Chip Select pin at all - these chips often have some way to wire each chip differently so that you can assign a different address to each chip.

The bottom line is that you need to study the data sheet for the individual serial ADC chip and make sure that you understand how the chip is selected or addressed. My point was that most serial ADC chips use the serial command to align the sample time. You cannot communicate to multiple devices simultaneously on a serial port - they must be accessed serially, thus the name.

Therefore you cannot sample simultaneously unless you use multiple serial ports in parallel. You still have to make sure that the technique you select is compatible with the addressing and sample timing scheme for which your chosen ADC chip is designed.

Brian Willoughby.

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TLV2544ID PDF Datasheet浏览和下载

These devices have three digital inputs and a 3-state output [chip select CS , serial input-output clock SCLK , serial data input SDI , and serial data output SDO ] that provide a direct 4-wire interface to the serial port of most popular host microprocessors SPI interface. The sample-and-hold function is automatically started after the fourth SCLK edge normal sampling or can be controlled by a special pin, CSTART, to extend the sampling period extended sampling. The conversion clock OSC and reference are built-in. The converter can use the external SCLK as the source of the conversion clock to achieve higher up to 2. Two different internal reference voltages are available. An optional external reference can also be used to achieve maximum flexibility. Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

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Interfacing the TLV2544 A/D to C5509 DSP

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