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ADS7811 Datasheet(PDF) 6 Page - Texas Instruments |
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ADS7811 Datasheet(HTML) 6 Page - Texas Instruments |
6 / 15 page ADS7811 6 SBOS041A www.ti.com 1 2 3 4 5 6 7 8 9 10 11 12 13 14 V IN GND REF CAP GND D15 D14 D13 D12 D11 D10 D9 D8 GND 28 27 26 25 24 23 22 21 20 19 18 17 16 15 +V S +V S BUSY CS R/C –V S D0 D1 D2 D3 D4 D5 D6 D7 ADS7811 R 1 75 Ω +5V –5V + 2.2µF C 4 0.1µF C 6 + 2.2µF C 3 0.1µF C 5 Convert Pulse 74HC00 100ns min 3.3µs max µProcessor Bus µProcessor Bus +5V 0.1µF C 1 + 10µF C 2 –5V OC 0.1µF C 7 + 10µF C 8 2 3 4 5 6 7 8 9 1D 2D 3D 4D 5D 6D 7D 8D 1Q 2Q 3Q 4Q 5Q 6Q 7Q 8Q 1 10 OC CLK 74HC574 2 3 4 5 6 7 8 9 1D 2D 3D 4D 5D 6D 7D 8D 1Q 2Q 3Q 4Q 5Q 6Q 7Q 8Q 1 10 OC CLK 74HC574 R 2 10 Ω OPA628 BASIC OPERATION Figure 1 shows the recommended circuit for operation of the ADS7811. A falling edge on the convert pulse signal places the sample and hold into the hold mode and initiates a conversion. When the conversion is complete, the pins D15 through D0 become active and the result of the conversion is placed on these outputs. In the circuit shown in Figure 1, the rising edge of BUSY latches the result into the 74HC574s. After the conversion is complete, the ADS7811 sample and hold returns to the sample mode and begins acquiring the input signal for the next conversion. Allowing 4 µs between falling edges of the convert pulse signal assures adequate acquisition time for the internal sample and hold. FIGURE 1. Basic Operation. |
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Similar Description - ADS7811_15 |
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