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LTC1603 Datasheet(PDF) 11 Page - Linear Technology |
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LTC1603 Datasheet(HTML) 11 Page - Linear Technology |
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11 / 20 page  1603f 11 LTC1603 APPLICATIONS INFORMATION RD = CONVST CS = 0 BUSY 1603 F08 tCONV t6 DATA (N – 1) D5 TO D0 DATA DATA N D15 TO D0 DATA (N + 1) D15 TO D0 DATA N D15 TO D0 t11 t8 t10 t7 RD = CONVST BUSY CS = 0 1603 F09 tCONV t6 DATA (N – 1) D15 TO D0 DATA DATA N D15 TO D0 t10 t11 t8 Figure 8. Mode 2. Slow Memory Mode Timing Figure 9. ROM Mode Timing three-state until read by the MPU with the RD signal. Mode 2 can be used for operation with a shared data bus. In slow memory and ROM modes (Figures 8 and 9) CS is tied low and CONVST and RD are tied together. The MPU starts the conversion and reads the output with the com- bined CONVST-RD signal. Conversions are started by the MPU or DSP (no external sample clock is needed). In slow memory mode the processor applies a logic low to RD (= CONVST), starting the conversion. BUSY goes low, forcing the processor into a wait state. The previous conversion result appears on the data outputs. When the conversion is complete, the new conversion results appear on the data outputs; BUSY goes high, releasing the processor and the processor takes RD (= CONVST) back high and reads the new conversion data. In ROM mode, the processor takes RD (= CONVST) low, starting a conversion and reading the previous conversion result. After the conversion is complete, the processor can read the new result and initiate another conversion. DIFFERENTIAL ANALOG INPUTS Driving the Analog Inputs The differential analog inputs of the LTC1603 are easy to drive. The inputs may be driven differentially or as a single- ended input (i.e., the AIN– input is grounded). The AIN+ and AIN– inputs are sampled at the same instant. Any un- wanted signal that is common mode to both inputs will be reduced by the common mode rejection of the sample- and-hold circuit. The inputs draw only one small current spike while charging the sample-and-hold capacitors at the end of conversion. During conversion the analog inputs draw only a small leakage current. If the source impedance of the driving circuit is low, then the LTC1603 inputs can be driven directly. As source impedance in- creases so will acquisition time (see Figure 10). For minimum acquisition time with high source impedance, a buffer amplifier should be used. The only requirement is that the amplifier driving the analog input(s) must settle after the small current spike before the next conversion |
Similar Part No. - LTC1603_15 |
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Similar Description - LTC1603_15 |
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