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LTC1297BCJ8 Datasheet(PDF) 8 Page - Linear Technology |
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LTC1297BCJ8 Datasheet(HTML) 8 Page - Linear Technology |
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8 / 24 page  8 LTC1292/LTC1297 TEST CIRCUITS Voltage Waveforms for ten The LTC1292/LTC1297 are data acquisition components which contain the following functional blocks: 1. 12-Bit Succesive Approximation Capacitive A/D Converter 2. Differential Input 3. Sample-and-Hold (S/H) 4. Synchronous, Half-Duplex Serial Interface 5. Control and Timing Logic DIGITAL CONSIDERATIONS Serial Interface The LTC1292/LTC1297 communicate with microproces- sors and other external circuitry via a synchronous, half- duplex, three-wire serial interface (see Operating Se- quence). The clock (CLK) synchronizes the data transfer with each bit being transmitted on the falling CLK edge. The LTC1292/LTC1297 do not require a configuration input word and have no DIN pin. They are permanently configured to have a single differential input and to per- form a unipolar conversion. A falling CS initiates data transfer. To allow the LTC1297 to recover from the power shutdown mode, tsuCS has to be met. Then the first CLK pulse enables DOUT. After one null bit, the A/D conversion result is output on the DOUT line with a MSB-first sequence followed by a LSB-first sequence. With the half-duplex serial interface the DOUT data is from the current conver- sion. This provides easy interface to MSB-first or LSB-first S APPLICATI I FOR ATIO serial ports. Bringing CS high resets the LTC1292/LTC1297 for the next data exchange and puts the LTC1297 into its power shutdown mode. Table 1. Microprocessor with Hardware Serial Interfaces Compatible with the LTC1292/LTC1297** DOUT 0.8V ten B11 CS CLK LTC1292/7 TC07 PART NUMBER TYPE OF INTERFACE Motorola MC6805S2, S3 SPI MC68HC11 SPI MC68HC05 SPI RCA CDP68HC05 SPI Hitachi HD6305 SCI Synchronous HD6301 SCI Synchronous HD63701 SCI Synchronous HD6303 SCI Synchronous HD64180 SCI Synchronous National Semiconductor COP400 Family MICROWIRE† COP800 Family MCROWIRE/PLUS† NS8050U MICROWIRE/PLUS HPC16000 Family MICROWIRE/PLUS Texas Instruments TMS7002 Serial Port TMS7042 Serial Port TMS70C02 Serial Port TMS70C42 Serial Port TMS32011* Serial Port TMS32020* Serial Port TMS370C050 SPI * Requires external hardware ** Contact factory for interface information for processors not on this list † MICROWIRE and MICROWIRE/PLUS are trademarks of National Semiconductor Corp. |
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