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AD1671 Datasheet(PDF) 11 Page - Analog Devices |
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AD1671 Datasheet(HTML) 11 Page - Analog Devices |
11 / 16 page AD1671 REV. B –11– Table III. Output Data Format Input Analog Digital Range Coding Input l Output OTR 2 0 V to +2.5 V Straight Binary ≤ –0.0003 V 0000 0000 0000 1 0 V 0000 0000 0000 0 +2.5 V 1111 1111 1111 0 ≥ +2.5003 V 1111 1111 1111 1 0 V to +5 V Straight Binary ≤ –0.0006 V 0000 0000 0000 1 0 V 0000 0000 0000 0 +5 V 1111 1111 1111 0 ≥ +5.0006 V 1111 1111 1111 1 –2.5 V to +2.5 V Offset Binary ≤ –2.5006 V 0000 0000 0000 1 –2.5 V 0000 0000 0000 0 +2.5 V 1111 1111 1111 0 ≥ +2.4994 V 1111 1111 1111 1 –5 V to +5 V Offset Binary ≤ –5.0012 V 0000 0000 0000 1 –5 V 0000 0000 0000 0 +5 V 1111 1111 1111 0 ≥ +4.9988 V 1111 1111 1111 1 –2.5 V to +2.5 V Twos Complement ≤ –2.5006 V 1000 0000 0000 1 (Using MSB) –2.5 V 1000 0000 0000 0 +2.5 V 0111 1111 1111 0 ≥ +2.4994 V 0111 1111 1111 1 –5 V to +5 V Twos Complement ≤ –5.0012 V 1000 0000 0000 1 (Using MSB) –5 V 1000 0000 0000 0 +5 V 0111 1111 1111 0 ≥ +4.9988 V 0111 1111 1111 1 NOTES 1Voltages listed are with offset and gain errors adjusted to zero. 2Typical performance. OUTPUT DATA FORMAT The AD1671 provides both MSB and MSB outputs, delivering data in positive true straight binary for unipolar input ranges and positive true offset binary or twos complement for bipolar input ranges. Straight binary coding is used for systems that ac- cept positive-only signals. If straight binary coding is used with bipolar input signals, a 0 V input would result in a binary output of 2048. The application software would have to subtract 2048 to determine the true input voltage. Host registers typically per- form math on signed integers and assume data is in that format. Twos complement format minimizes software overhead which is especially important in high speed data transfers, such as a DMA operation. The CPU is not bogged down performing data conversion steps, hence the total system throughput is increased. OPTIONAL EXTERNAL REFERENCE The AD1671 includes an onboard +2.5 V reference. The refer- ence input pin (REF IN) can be connected to reference output pin (REF OUT) or a standard external +2.5 V reference can be selected to meet specific system requirements. Fast switching in- put dependent currents are modulated at the reference input. The reference input voltage can be held with the use of a capaci- tor. To prevent the AD1671’s onboard reference from oscil- lating when not connected to REF IN, REF OUT must be connected to +5 V. It is possible to connect REF OUT to +5 V due to its output circuit implementation which shuts down the reference. ILOGIC VS. CONVERSION RATE Figure 15 is the typical logic supply current vs. conversion rate for various capacitor loads on the digital outputs. 6.5 6.0 5.5 5.0 4.5 4.0 3.5 3.0 2.5 2.0 1.5 1.0 0.5 1M CONVERSION RATE – Hz 1k 10k 100k CL = 50pF CL = 30pF CL = 0pF Figure 15. ILOGIC vs. Conversion Rate for Various Capacitive Loads on the Digital Outputs |
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