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LTC2327-18 数据表(PDF) 31 Page - Linear Technology |
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LTC2327-18 数据表(HTML) 31 Page - Linear Technology |
31 / 40 page LTC2335-16 31 233516f For more information www.linear.com/LTC2335-16 Figure 16. Power Dissipation of the LTC2335-16 Decreases with Decreasing Sampling Frequency applicaTions inForMaTion Power Dissipation vs Sampling Frequency When nap mode is employed, the power dissipation of the LTC2335-16 decreases as the sampling frequency is reduced, as shown in Figure 16. This decrease in aver- age power dissipation occurs because a portion of the LTC2335-16 circuitry is turned off during nap mode, and the fraction of the conversion cycle (tCYC) spent napping increases as the sampling frequency (fSMPL)isdecreased. DIGITAL INTERFACE TheLTC2335-16featuresCMOSandLVDSserialinterfaces, selectable using the LVDS/CMOS pin. The flexible OVDD supply allows the LTC2335-16 to communicate with any CMOSlogicoperatingbetween1.8Vand5V,including2.5V and 3.3V systems, while the LVDS interface supports low noise digital designs. Together, these I/O interface options enable the LTC2335-16 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 serial data output, SDO. Communication with the LTC2335-16 across this bus occurs during predefined data transaction windows. Within a window, the device accepts control words on SDI to configure the SoftSpan range and channel for the next conversionandprogramthesequencer,andoutputs24-bit packetscontainingtheconversionresultandconfiguration information from the previous conversion on SDO. Figure 17. Serial CMOS I/O Mode, Direct Per-Conversion Configuration C7 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 C6 C5 C4 C3 C2 C1 C0 D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 0 0 D15 CNV CS = PD = 0 DON’T CARE tACQ BUSY SCKO SDO SCKI SDI DON’T CARE DON’T CARE SAMPLE N RECOMMENDED DATA TRANSACTION WINDOW SAMPLE N + 1 CONTROL WORD FOR CONVERSION N + 1 24-BIT PACKET CONVERSION N 24-BIT PACKET CONVERSION N (REPETITION) CONVERSION RESULT CHANNEL ID SoftSpan CONVERSION RESULT CH2 CH1 CH0 SS1 SS2 SS0 tSSDISCKI tHSDOSCKI tDSDOSCKI tBUSYLH tHSDISCKI tSCKIH tQUIET tSCKIL tDSDOBUSYL tCNVH tSKEW tCONV tCNVL tCYC 233516 F17 tSCKI IOVDD IVDD IVEE IVCC WITH NAP MODE t CNVL = 500ns SAMPLING FREQUENCY (kHz) 0 200 400 600 800 1000 –6 –4 –2 0 2 4 6 8 10 12 14 16 233516 F16 |
类似零件编号 - LTC2327-18 |
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类似说明 - LTC2327-18 |
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