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AD7233BN Arkusz danych(PDF) 6 Page - Analog Devices |
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AD7233BN Arkusz danych(HTML) 6 Page - Analog Devices |
6 / 8 page AD7233–Typical Performance Graphs REV. A –6– APPLYING THE AD7233 Bipolar ( 5 V) Configuration The AD7233 provides an output voltage range from –5 V to +5 V without any external components. This configuration is shown in Figure 4. The data format is two's complement. The output code table is shown in Table I. If offset binary coding is required, then this can be done by inverting the MSB in soft- ware before the data is loaded to the AD7233. AD7233 V DD VSS GND 12-BIT DAC 2R 2R VOUT +15V –15V +5V +12V TO –12V TO Figure 4. Circuit Configuration Power Supply Decoupling To achieve optimum performance when using the AD7233, the VDD and VSS lines should each be decoupled to GND using 0.1 µF capacitors. In very noisy environments it is recom- mended that 10 µF capacitors be connected in parallel with the 0.1 µF capacitors. Table I. AD7233 Bipolar Code Table Input Data Word MSB LSB Analog Output, VOUT XXXX 0111 1111 1111 +5 V • (2047/2048) XXXX 0000 0000 0001 +5 V • (1/2048) XXXX 0000 0000 0000 0 V XXXX 1111 1111 1111 –5 V • (1/2048) XXXX 1000 0000 0001 –5 V • (2047/2048) XXXX 1000 0000 0000 –5 V • (2048/2048) = –5 V X = Don’t Care Note: 1 LSB = 5 V/2048 ≈ 2.4 mV 100 0 100k 20 10 1k 10 40 30 50 60 70 80 90 100 10k FREQUENCY – Hz OUTPUT WITH ALL 0s ON DAC DECOUPLING DECOUPLING NO DECOUPLING OUTPUT WITH ALL 1s ON DAC NO DECOUPLING V = +15V WITH 100mV p–p SIGNAL DD POWER SUPPLY DECOUPLING CAPACITORS ARE 10 µF AND 0.1µF. * Power Supply Rejection Ratio vs. Frequency 0.50 0 16 0.10 13 10.5 0.20 0.30 0.40 11 12 14 15 T = +25 C A V /V – Volts DD SS Linearity vs. Power Supply Voltage 500 0 100k 20 5k 50 50 100 200 100 200 500 1k 2k 10k 20k 50k FREQUENCY – Hz OUTPUT WITH ALL 0s ON DAC V = +15V V = – 15V T = +25 C DD SS A Noise Spectral Density vs. Frequency |
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