Coded data generation or conversion – Analog to or from digital conversion – Analog to digital conversion
Patent
1995-02-27
1997-04-08
Gaffin, Jeffrey A.
Coded data generation or conversion
Analog to or from digital conversion
Analog to digital conversion
341156, H03M 100
Patent
active
056192045
ABSTRACT:
An IC chip having an analog-to-digital converter together with control circuitry for effecting switchover between normal-power mode and low-power mode. The control circuitry includes a first D-type flip-flop with reset which receives on its "D" input a continuous high signal; on its differential clock inputs the flip-flop receives complementary logic signals derived from the "conversion start" (CONVST) signal applied to one pin of an 8-pin chip. In normal mode, the CONVST signal is a short pulse having an initial negative-going (falling) leading edge, and the flip-flop responds to that leading edge by producing a high Q output (CONVEN). This signals the A/D converter to carry out a conversion. In low-power mode, the CONVST short pulse is positive. The subsequent negative-going (falling) trailing edge of the pulse activates the flip-flop to cause its Q output to go high and turn on the A/D converter. The control circuitry includes a second D-type flip-flop (this one with set) which receives on its D input the CONVST signal. The Q output. of the second flip-flop generates a mode switchover control signal (designated SLEEPB). During low-power mode, established by the use of positive-going CONVST pulses, the low CONVEN signal at the end of conversion clocks the second flip-flop to sample CONVST on its D input, thereby causing the Q output of the second flip-flop (SLEEPB) to go low and switch the A/D converter into low-power status.
REFERENCES:
patent: 4963840 (1990-10-01), Thommen
3VCLC.sup.2 MOS 12-Bit, Serial 8 s ADC in 8-Pin Package, Analog Devices, Prelim. B Sep. 1993.
Analog Devices--LC.sup.2 MOS 8-channel, 12-bit serial data acquisition system AD7890.
Byrne Michael
Price Colin
Reidy John
Smith Simon
Analog Devices Incorporated
Gaffin Jeffrey A.
Jean-Pierre Peguy
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