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SP674BJ Datasheet(PDF) 10 Page - Sipex Corporation |
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SP674BJ Datasheet(HTML) 10 Page - Sipex Corporation |
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10 / 15 page  SP574B/674B/1674B/774B 12–Bit Sampling A/D Converters © Copyright 2000 Sipex Corporation 10 A 0 may be toggled without damage to the con- verter at any time. Break–before–make action is guaranteed between the two data bytes. This as- sures that the outputs which are strapped together in Figure 5 will never be enabled at the same time. In Figure 7, it can be seen that a read operation usually begins after the conversion is complete and STS is low. If earlier access is needed, the read can begin no later than the addition of times t DD and tHS before STS goes low. "NYQUIST" SAMPLING Each of the SPx74B analog-to-digital convert- ers has been designed to provide Nyquist sam- pling (highest input frequency is 1/2 of the sampling rate) data conversion with no degra- dation in DC performance. This is shown in Figure 10. Note that the Differential Linearity and Integral Linearity min/max values are well within the ± 1/2 LSB limits of a K-version Converter. Also, the Typical FFT at Nyquist rates shown on Figure 10 reflect the values listed in the Typical AC Dynamics table. STS DELAY R CK Q D H D CK Q Q EOC8 EOC12 CE R/C A0 CS 12/8 READ CONTROL A0 LATCH INPUT BUFFERS NIBBLE B ZERO OVERRIDE NIBBLE A, B NIBBLE C Figure 4. SPx74B Control Logic 28 27 26 25 24 23 22 21 20 19 18 17 16 15 STS DB11 (MSB) DB0 (LSB) DIG COM SPx74B 2 4 A0 ADDRESS BUS A0 12/8 DATA BUS Figure 5. Interfacing SPx74B to 8–Bit Interface Bus |
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