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LTC6252 Datasheet(PDF) 32 Page - Linear Technology |
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LTC6252 Datasheet(HTML) 32 Page - Linear Technology |
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32 / 40 page  LTC2345-18 32 234518f For more information www.linear.com/LTC2345-18 applicaTions inForMaTion throughput. Together, these I/O interface options enable the LTC2345-18 to communicate equally well with legacy microcontrollers and modern FPGAs. Serial CMOS I/O Mode As shown in Figure 17, in CMOS I/O mode the serial data bus consists of a serial clock input, SCKI, serial data input, SDI, serial clock output, SCKO, and eight lanes of serial data output, SDO0 to SDO7. Communication with the LTC2345-18 across this bus occurs during predefined data transaction windows. Within a window, the device accepts 24-bit SoftSpan configuration words for the next conversion on SDI and outputs 24-bit packets containing conversion results and channel configuration information from the previous conversion on SDO0 to SDO7. New data transaction windows open 10ms after powering up or resetting the LTC2345-18, and at the end of each con- version on the falling edge of BUSY. In the recommended use case, the data transaction should be completed with a minimum tQUIET time of 20ns prior to the start of the next conversion, as shown in Figure 17. New SoftSpan configuration words are only accepted within this recom- mended data transaction window, but SoftSpan changes take effect immediately with no additional analog input settling time required before starting the next conversion. It is still possible to read conversion data after starting the nextconversion,butthiswilldegradeconversionaccuracy and therefore is not recommended. Just prior to the falling edge of BUSY and the opening of a new data transaction window, SCKO is forced low and SDO0 to SDO7 are updated with the latest conversion results from analog input channels 0 to 7, respectively. Rising edges on SCKI serially clock conversion results and analog input channel configuration information out on SDO0 to SDO7 and trigger transitions on SCKO that are skew-matched to the data on SDO0 to SDO7. The resulting C2 C1 C0 C2 C1 C0 S23 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 S22 S21 S20 S19 S18 S17 S16 S15 S14 S13 S12 S11 S10 S9 S8 S7 S6 S5 S3 S4 S1 S2 S0 D17 D16 D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 SS1 SS2 SS0 D17 CNV CS = PD = 0 DON’T CARE tACQ BUSY SDO7 SCKO SDO0 SCKI SDI DON’T CARE SAMPLE N RECOMMENDED DATA TRANSACTION WINDOW SAMPLE N + 1 SOFTSPAN CONFIGURATION WORD FOR CONVERSION N + 1 CHANNEL 0 24-BIT PACKET CONVERSION N CHANNEL 1 24-BIT PACKET CONVERSION N CHANNEL 7 24-BIT PACKET CONVERSION N CHANNEL 0 24-BIT PACKET CONVERSION N 234518 TD01 CONVERSION RESULT CHANNEL ID SOFTSPAN CONVERSIONRESULT D17 D16 D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 SS1 SS2 SS0 D17 DON’T CARE CONVERSION RESULT CHANNEL ID SOFTSPAN CONVERSIONRESULT tSCKI tSCKIH tBUSYLH tSCKIL tHSDOSCKI tDSDOSCKI tSSDISCKI tQUIET tHSDISCKI tDSDOBUSYL tCNVH tSKEW tCONV tCNVL tCYC Figure 17. Serial CMOS I/O Mode |
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